a light receiving unit, where the light source unit is configured to emit light, where the diffusing component is configured to modulate the light emitted by the light source unit to form a specific light field distribution, where the light receiving unit receives reflected light, where the diffusing component includes:

a resin substrate; and

a microlens layer, where the microlens layer is integrally formed on a surface of the resin substrate by imprinting.

In another aspect of the present invention, a resin DOE manufacturing method is provided according to the present invention, which includes steps of:

- placing a liquid resin material on a first imprinting surface of a first mold and/or a second imprinting surface of a second mold of a manufacturing apparatus;
- performing nanoimprinting on the liquid resin material by operating the first mold and/or the second mold of the manufacturing apparatus in a mold closing manner, to press the liquid resin material to spread in a space between the first imprinting surface of the first mold and the second imprinting surface of the second mold in a filling manner;
- performing a curing operation on the liquid resin material, to allow the liquid resin material to form, after being cured, a resin DOE with an integrally formed structure; and
- taking out the resin DOE as a finished DOE by operating the first mold and/or the second mold of the manufacturing apparatus in a mold opening manner.

In an embodiment of the present invention, the first imprinting surface of the first mold is one micro-nano structured surface, and the second imprinting surface of the second mold is another micro-nano structured surface or a flat substrate surface.

In an embodiment of the present invention, the liquid resin material is a light-curable liquid resin adhesive.

In an embodiment of the present invention, the step of placing a resin material in a liquid state on a first imprinting surface of a first mold and/or a second imprinting surface of a second mold of a manufacturing apparatus includes steps of:

- after the manufacturing apparatus and the liquid resin material are prepared, the liquid resin material with a preset weight is dispensed on a specific region of the second imprinting surface of the second mold of the manufacturing apparatus.

In an embodiment of the present invention, the specific region is a central region of the second imprinting surface of the second mold.

In an embodiment of the present invention, the step of performing nanoimprinting on the liquid resin material by operating the first mold and/or the second mold of the manufacturing apparatus in a mold-closing manner, to press the liquid resin material to spread in a space between the first imprinting surface of the first mold and the second imprinting surface of the second mold in a filling manner includes steps:

- operating the first mold or the second mold to allow the center of the first imprinting surface of the first mold to correspond to the center of the second imprinting surface of the second mold, and the first imprinting surface of the first mold to be parallel to the second imprinting surface of the second mold;
- gradually reducing the spacing between the first imprinting surface of the first mold and the second imprinting surface of the second mold to a preset distance while keeping the first imprinting surface of the first mold and the second imprinting surface of the second mold in parallel with each other; and
- pressing the liquid resin material to spreadingly fill the space outwardly from the center between the first imprinting surface of the first mold and the second imprinting surface of the second mold.

In an embodiment of the present invention, in the step of performing a curing operation on the liquid resin material, to allow the liquid resin material to form, after being cured, a resin DOE with an integrated structure:

- light irradiation treatment is performed on the liquid resin material through the first mold, and after the specified dose is reached, the light irradiation is stopped, so that the liquid resin material is light-cured to form the resin DOE with an integrally formed structure.

According to another aspect of the present invention, a resin DOE is further provided according to the present invention, which includes:

- at least one microstructured layer; and
- a substrate layer, where the substrate layer is integrally connected to the at least one microstructured layer, and the at least one microstructured layer and the substrate layer are manufactured by integrally nanoimprinting a liquid resin material and then curing.

In an embodiment of the present invention, a method for manufacturing the resin DOE includes steps of:

- placing a resin material in liquid state on a first imprinting surface of a first mold and/or a second imprinting surface of a second mold of a manufacturing apparatus;
- performing nanoimprinting on the liquid resin material by operating the first mold and/or the second mold of the manufacturing apparatus in a mold-closing manner, so that the liquid resin material is pressed to spread in a space between the first imprinting surface of the first mold and the second imprinting surface of the second mold in a filling manner;
- performing a curing operation on the liquid resin material, to allow the liquid resin material to form, after being cured, the resin DOE with an integrally formed structure; and
- taking out the resin DOE as a finished DOE by operating the first mold and/or the second mold of the manufacturing apparatus in a mold opening manner.

According to another aspect of the present invention, a manufacturing apparatus for manufacturing a resin DOE from a liquid resin material is further provided according to the present invention, where the manufacturing apparatus includes:

- at least one first mold, where the first mold has a first imprinting surface; and
- at least one second mold, where the second mold has a second imprinting surface, and the first mold and/or the second mold can be operated such that the manufacturing apparatus is switched between a mold closed state and a mold opened state;
- where when the manufacturing apparatus is switched from the mold opened state to the mold closed state, the spacing between the first imprinting surface of the first mold and the second imprinting surface of the second mold is reduced, for pressing the liquid resin material to spread in a space between the first imprinting surface of the first mold and the second imprinting surface of the second mold to fill the space, and form the resin DOE after the liquid resin material is cured; and
- where when the manufacturing apparatus is switched from the mold closed state to the mold opened state, the spacing between the first imprinting surface of the first mold and the second imprinting surface of the second mold becomes large for removing the resin DOE as a finished DOE.

In an embodiment of the present invention, the first imprinting surface of the first mold is one micro-nano structured surface, and the second imprinting surface of the second mold is another micro-nano structured surface or a flat substrate surface.

In an embodiment of the present invention, the first mold is made of a light-transmitting material.

In an embodiment of the present invention, the manufacturing apparatus further includes a spill prevention mechanism, where the spill prevention mechanism is arranged between the first mold and the second mold, and when the manufacturing apparatus is in the mold closed state, the spill prevention mechanism surrounds the first imprinting surface and the second imprinting surface, for blocking the liquid resin material from spreading to regions beyond the first imprinting surface and the second imprinting surface.

In an embodiment of the present invention, the spill prevention mechanism of the manufacturing apparatus includes an annular spill prevention member, specifically, the annular spill prevention member extends convexly from the second imprinting surface of the second mold, and the annular spill prevention member surrounds the second imprinting surface to form a recess with the second imprinting surface as a bottom surface.

In an embodiment of the present invention, the spill prevention mechanism includes an annular spill prevention member, where a part of the annular spill prevention member extends by protruding from the second imprinting surface of the second mold, and another part of the annular spill prevention member extends by protruding from the first imprinting surface of the first mold, and when the manufacturing apparatus is in a mold closed state, the two parts of the annular spill prevention member cooperate with each other to form the complete annular spill prevention member.

In an embodiment of the present invention, the manufacturing apparatus further includes a manufacturing system of a resin DOE. The manufacturing system of the resin DOE includes a material placement module, a mold closing module, a curing module and a mold opening module. The material placement module is configured to place the liquid resin material on the first imprinting surface of the first mold and/or the second imprinting surface of the second mold; the mold closing module is configured to operate the first mold and/or the second mold by mold closing, for nano-imprinting the liquid resin material, so that the liquid resin material is pressed to spread in a space between the first imprinting surface of the first mold and the second imprinting surface of the second mold in a filling manner; the curing module is configured to perform an operation of curing on the liquid resin material, to allow the liquid resin material to form a resin DOE with an integrally formed structure after being cured; and the mold opening module is configured to operate the first mold and/or the second mold of the manufacturing apparatus by mold opening, to take out the resin DOE as a finished DOE.

Further objects and advantages of the present invention are fully presented from the understanding of subsequent description and drawings.

These and other objects, features and advantages of the present invention will be fully presented from the following detailed description, drawings and claims.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1A is a schematic structural diagram of a diffusing component in the conventional technology.

FIG. 1B is a schematic structural diagram of another diffusing component in the conventional technology.

FIG. 2 is a schematic structural diagram of a diffusing component according to a preferred embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a microlens layer of the diffusing component according to the above preferred embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a manufacturing device for manufacturing the diffusing component according to the above preferred embodiment of the present invention.

FIG. 5 is a schematic structural diagram showing a manufacturing process of the manufacturing device for manufacturing the diffusing component according to the above preferred embodiment of the present invention.

FIG. 6 is a schematic structural diagram showing a manufacturing process of the manufacturing device for manufacturing the diffusing component according to the above preferred embodiment of the present invention.

FIG. 7 is a schematic structural diagram showing a manufacturing process of the manufacturing device for manufacturing the diffusing component according to the above preferred embodiment of the present invention.

FIG. 8 is a schematic structural diagram showing that the manufacturing device for manufacturing the diffusing component relatively reduces a spacing between a mold and a flat supporting surface to a preset distance L in a manufacturing process according to the above preferred embodiment of the present invention.

FIG. 9 is a schematic diagram showing a manufacturing process of the manufacturing device for manufacturing the diffusing component in which a liquid resin material is light-cured according to the above preferred embodiment of the present invention.

FIG. 10 is a schematic diagram of obtaining the diffusing component from the manufacturing process of the manufacturing device for manufacturing the diffusing component according to the above preferred embodiment of the present invention.

FIG. 11A is a schematic structural diagram of a manufacturing process of the manufacturing device for manufacturing the diffusing component according to a first variant embodiment of the above preferred embodiment of the present invention.

FIG. 11B is a schematic structural diagram of a manufacturing process of the manufacturing device for manufacturing the diffusing component according to a first variant embodiment of the above preferred embodiment of the present invention.

FIG. 11C is a schematic structural diagram of a manufacturing process of the manufacturing device for manufacturing the diffusing component according to a first variant embodiment of the above preferred embodiment of the present invention.

FIG. 12A is a schematic structural diagram of a manufacturing process of the manufacturing device for manufacturing the diffusing component according to a second variant embodiment of the above preferred embodiment of the present invention.

FIG. 12B is a schematic structural diagram of a manufacturing process of the manufacturing device for manufacturing the diffusing component according to a second variant embodiment of the above preferred embodiment of the present invention.

FIG. 12C is a schematic structural diagram of a manufacturing process of the manufacturing device for manufacturing the diffusing component according to a second variant embodiment of the above preferred embodiment of the present invention.

FIG. 13 is a structural block diagram of the manufacturing device for manufacturing the diffusing component according to the above preferred embodiment of the present invention.

FIG. 14 is a structural block diagram of an imaging module for the diffusing component according to the above preferred embodiment of the present invention.

FIGS. 15A and 15B are schematic structural diagrams of a DOE finished product in the conventional technology.

FIGS. 16 and 17 are schematic flowcharts of a manufacturing method of a resin DOE according to an embodiment of the present invention.

FIG. 18 shows an example of a material placement step in the manufacturing method of the resin DOE according to the above embodiments of the present invention.

FIG. 19 shows an example of a mold closing step in the manufacturing method of the resin DOE according to the above embodiments of the present invention.

FIG. 20 shows an example of a curing step in the manufacturing method of the resin DOE according to the above embodiments of the present invention.

FIG. 21 shows an example of a mold opening step in the manufacturing method of the resin DOE according to the above embodiments of the present invention.

FIG. 22 shows a variant example of a manufacturing apparatus in the manufacturing method of the resin DOE according to the above embodiments of the present invention.

FIG. 23 shows a schematic block diagram of a manufacturing system of a resin DOE in the manufacturing apparatus according to the above embodiments of the present invention.

DETAILED DESCRIPTION

The following description serves to disclose the present invention to enable the person skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and the person skilled in the art can devise other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present invention.

Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by terms such as “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, are based on the orientation or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, so the above terms should not be construed as limiting the present invention.

It can be understood that the term “a” should be understood as “at least one” or “one or more”, that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term “a” cannot be understood as a limitation on the quantity.

In the description of this specification, descriptions with reference to the terms “one embodiment”, “some embodiments”, “example”, “specific examples”, or “some examples” mean that specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can integrate and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

FIG. 2 is a schematic structural diagram of a diffusing component 100 according to a preferred embodiment of the present invention. The diffusing component 100 is applicable to an electronic product such as a camera module such as a TOF camera module, a depth camera, 3D imaging, face recognition, smart home, a robot, an unmanned aerial vehicle, AR/VR and automatic driving, etc., where the diffusing component 100 is configured to modulate a light beam emitted by a light source to form a specific homogenous light field within a required field viewing angle range, so as to improve the imaging quality of the electronic product.

As shown in FIG. 2, the diffusing component 100 includes a resin substrate 10 and a microlens layer 20, where the microlens layer 20 is integrally formed on a surface of the resin substrate 10 by imprinting. The resin substrate 10 is a resin material, such as a resin adhesive, where the diffusing component 100 can pass material reliability tests, such as thermal shock, high temperature and high humidity, reflow soldering, micro-drop. Since the diffusing component 100 is made of the resin material, it is not apt to break, and there is no need to install sensors for detecting the breakage in the electronic product, such as a camera module, to which the diffusing component is applied, which reduces the cost of the electronic product. Compared with the conventional injection-molded diffusing component, the diffusing component 100 according to the present invention is integrally formed by imprinting, so that the replication capability is high and the structure restoration capability is strong. Furthermore, in the manufacturing equation of the diffusing component 100, there is no need to use high temperature, no need a cooling and solidifying process, the coefficient of thermal expansion is small, and the energy consumption is low, and the difference between the shape of the diffusing component finally formed and the designed shape is small.

Preferably, the resin material is a light-curable liquid resin material, and the light-cured resin material has a good toughness, high material stability, and is not apt to break. In the process of manufacturing the diffusing component 100, the liquid resin material can be imprinted into a certain pattern to form the microlens layer 20 of the diffusing component 100, and then the liquid resin material is light-cured, to obtain the resin material light-cured, that is, the diffusing component 100. It is to be pointed out that in a manufacturing method for the diffusing component 100, the resin material in the molten state is not required, and it is not required to use high temperature and the cooling and solidifying process are not required. Therefore, compared with the conventional injection-molded diffusing component, the manufacturing process of the diffusing component 100 according to the present invention has a low energy consumption and high replicability, and the difference between the shape of the diffusing component finally formed and the designed shape is small.

For the diffusing component 100 obtained by light-curing the resin material, after the reliability tests that common electronic products must pass, such as thermal shock, reflow soldering, high temperature and high humidity, and drop tests, the diffusing component 100 is not prone to material yellowing, material pulverization and brittleness, and can still ensure reliable transmittance and optical properties.

Further, as shown in FIG. 4, a manufacturing device 600 for manufacturing the diffusing component 100 is further provided according to this preferred embodiment, the manufacturing device 600 includes a supporting plate 610 and a mold 620. The supporting plate 610 has at least one flat supporting surface 601, where the mold 620 has at least one microstructured surface 621 for forming the microlens layer 20 of the diffusing component 100, the microstructured surface 621 corresponds to the flat supporting surface 601, and is separated from the flat supporting surface 601 by a certain spacing D. The mold 620 and the supporting plate 610 can move relatively to reduce or increase the spacing D between the microstructured surface 621 of the mold 620 and the flat supporting surface 601 of the supporting plate 610.

Furthermore, a manufacturing method for the diffusing component 100 is further provided according to this preferred embodiment, which includes: S10, S20 and S30.

- S10 may include arranging a preset amount of a light-curable resin material 630 in a liquid state on the flat supporting surface 601 of the supporting plate 610;
- S20 may include relatively reducing the spacing D between the microstructured surface 621 of the mold 620 and the flat supporting surface 601 until reaching a preset distance, where the resin material 630 is located between the microstructured surface 621 and the flat supporting surface 601, and at the preset distance, the resin material 630 in a liquid state is spread between the microstructured surface 621 and the flat supporting surface 601 and has a certain spread area, where the microstructured surface 621 of the mold 620 is imprinted on the surface of the resin material 630 to form the microlens layer 20.
- S30 may include performing a light-curing treatment on the resin material 630 in a liquid state to obtain the light-cured resin material 630 as the diffusing component 100.

It can be seen that, in the manufacturing method, it is not required to process the resin material 630 by means of high temperature, cooling and solidification.

As shown in FIG. 3, the microlens layer 20 is a microlens array structure composed of a group of stochastically arranged microlens units 21, where some parameters of the microlens units 21 are all different, so as to prevent light from producing interference fringes when the light passes through the diffusing component 100 and propagates in space, which facilitates formation of a homogenous light field.

The microstructured surface 621 of the mold 620 is set to correspondingly imprint to form the microlens structure of the microlens layer 21, that is, the microstructured surface 621 of the mold 620 can be in the liquid state. The surface of the resin material 630 is imprinted to form the microlens array of the microlens layer 21.

Compared with the conventional regularly arranged microlens array, the microlens array of the diffusing component 100 according to the present invention can avoid the phenomenon of producing bright and dark fringes due to the interference effect during the propagation of the light beam in space, and improve the homogeneousness of the light field, which facilitates the improvement of the detection quality. The microlens array implements modulation to the light beam based on the principle of refraction optics, which avoids disadvantages in the conventional diffractive diffusing component that the conventional diffractive diffusing component has the zeroth order which obviously results in poor energy homogeneousness or the conventional light homogenization element has a low diffraction efficiency which results in low transmittance and other disadvantages, thereby facilitating the collection of information by the detection apparatus and improving the detection quality.

Part of the parameters or random regular variables of the microlens units 21 are preset to change stochastically regularly respectively within certain ranges, so that the microlens units 21 have random regularized shapes and sizes or spatial arrangements, that is, the shapes and sizes of any two microlens units 21 are different from each other, and arrangements are irregular, so as to prevent light beam from producing interference fringes when the light beam propagates in space, so as to improve the diffusing effect, thereby meeting the modulation to required spot shape and light intensity distribution of the target lighting scene.

Preferably, the microlens unit 21 has an aspheric surface, which is an optical structure with a power effect. For example, the microlens unit 21 may be a concave lens or a convex lens, which is not specifically limited here. By stochastically processing some of the parameters or variables of the microlens units 21 in a regularized manner, that is, a modulation process, the regulation to the required light spot shape and light intensity distribution of the illumination target scene can be realized. Some random parameters of the microlens unit 21 include but are not limited to radius of curvature, conic constant, aspheric coefficient, shape and size of the effective light aperture of the microlens unit 21, that is, the cross-sectional profile of the microlens unit 21 on the X-Y plane, the spatial arrangement of the microlens units 21, and the surface profile of the microlens unit 21 along the Z-axis direction and other variables.

Preferably, the surface profile z of each of the microlens units 21 is expressed as:

z
=

cr
2

1
+

1
-

(

1
+
k

)

⁢

c
2

⁢

r
2

+

∑

i
=
1

N

A
i

⁢

E
i

(

x
,
y

)

where,

cr
2

1
+

1
-

(

1
+
k

)

⁢

c
2

⁢

r
2

is a basic aspheric term, where c is a curvature of the microlens

unit, k is a conic constant, where

∑

i
=
1

N

A
i

⁢

E
i

(

x
,
y

)

is extended polynomials, where N is the number of the polynomials,

A_iis the coefficient of the i^−thextended polynomial, and the polynomial E_i(x,y) is a power series of x and y, where the first term is x, the second term is y, and then x*x, x*y, y *y, . . . .

As an example, the design method of a first embodiment of the microstructured surface 621 of the mold 620 and the microlens array of the diffusing component 20 corresponding to the microstructured surface 621 according to this embodiment includes steps S01, S02, S03 and S04.

The step S01 may include marking off regions where the microlens units 21 are located respectively on the surface of the substrate, the cross-sectional shapes or sizes of the regions where the microlens units 21 are located respectively are basically consistent;

- the step S02 may include establishing a global coordinate system (X, Y, Z) for the entire microlens array, and establishing a local coordinate system (x_i, y_i, z_i) for each individual microlens unit, and the central coordinates of the corresponding region are (x₀, y₀, z₀), where the central coordinates of the region represent an initial central position of the corresponding microlens unit 21;
- the step S03 may include setting a real center position of each of the microlens units to be a position obtained by adding a random offset X_Offset, and a random offset Y_Offsetto central coordinates of the region in an X-axis direction and a Y-axis direction respectively; and
- the step S04 may include, for each of the microlens units, representing its surface profile in the Z-axis direction by a camber function f:

f
=

cr
2

1
+

1
-

(

1
+
k

)

⁢

c
2

⁢

r
2

+

∑

i
=
1

N

A
i

⁢

E
i

(

x
i

-

x
0

-

X
offset

,

y
i

-

y
0

-

Y
offset

)

+

Z
offset

- where, r²=(x_i−x₀−X_Offset)²+(y_i−y₀−Y_Offset)², c is the curvature of the microlens unit, k is the conic constant, A_iis a coefficient of the i-th extended polynomial, and Z_Offsetis an offset in the Z-axis direction corresponding to each of the microlens units.

It should be pointed out that values of the curvatures c, the conic constants k and the aspheric coefficients A_iof the microlens units are set stochastically in a regularized manner within a certain range according to the application scene used. On the basis of performing stochastically and regularized processing on parameters such as curvatures c, conic constants k, and aspheric surface coefficients A_iof the microlens units within a predetermined range, the coordinates of each of the microlens units are transformed from the local coordinate system (x_i, y_i, z_i) into the global coordinate system (X, Y, Z), and the offset Z_Offsetin the Z-axis direction corresponding to each of the microlens units is stochastically regularized within a certain range, to allow the surface profile in the Z-axis direction of each of the microlens units to be non-periodically regularized, which prevents the light beam from producing interference fringes so as to achieve a diffusing effect.

In the step S01, the cross-sectional shapes of the regions where the microlens units 21 are located respectively are selected from a group of: rectangle, circle, triangle, trapezoid, polygon or other irregular shapes, which are not limited here.

As an example, a design method of a second embodiment of the microstructured surface 621 of the mold 620 and the microlens array of the diffusing component 20 corresponding to the microstructured surface 621 is provided according to this embodiment, and the design method includes steps: S01a, S02b and S03c.

The step S01a may include marking off regions where the microlens units 21 are located respectively on the surface of the substrate, specifically, the cross-sectional shapes or sizes of the regions where the microlens units 21 are located respectively are different from each other;

- the step S02b may include establishing a global coordinate system (X, Y, Z) for the entire microlens array, and establishing a local coordinate system (x_i, y_i, z_i) for each individual microlens unit, and the central coordinates of the local coordinate system are (x₀, y₀, z₀); and
- the step S03c may include, for each of the microlens units, representing its surface profile in the Z-axis direction by a camber function f:

f
=

cr
2

1
+

1
-

(

1
+
k

)

⁢

c
2

⁢

r
2

+

∑

i
=
1

N

A
i

⁢

E
i

(

x
i

-

x
0

,

y
i

-

y
0

)

+

Z
offset

- where, r²=(x_i−x₀)²+(y_i−y₀)², c is the curvature of the microlens unit, k is the conic constant, A_iis the coefficient of the i-th extended polynomial, and Z_Offsetis an offset in the Z-axis direction corresponding to each of the microlens units.

It should be pointed out that values of the curvatures c, the conic constants k and the aspheric coefficients A_iof the microlens units 21 are set stochastically in a regularized manner within a corresponding certain range according to the application scene used. On the basis of performing stochastically and regularized processing on parameters such as curvatures c, conic constants k, and aspheric surface coefficients A_iof the microlens units 21 within a predetermined range, the coordinates of each of the microlens units 21 are transformed from the local coordinate system (x_i, y_i, z_i) into the global coordinate system (X, Y, Z), and the offset Z_Offsetin the Z-axis direction corresponding to each of the microlens units 21 is stochastically processed in a regularized manner within a certain range, to allow the surface profile in the Z-axis direction of each of the microlens units 21 to be non-periodically regularized, which prevents the light beam from producing interference fringes so as to achieve a diffusing effect.

Further, in the manufacturing method for the diffusing component 100, in the step S20, the mold 620 is kept parallel to the flat supporting surface 601. That is, when the mold 620 and the supporting plate 610 are moved relative to each other, the microstructured surface 621 of the mold 620 and the flat supporting surface 601 of the supporting plate 610 are always kept parallel to each other. In other words, in the step S20, the spacing between the mold 620 and the flat supporting surface 601 is relatively reduced while the mold 620 and the flat supporting surface 601 are kept parallel to each other.

Further, as shown in FIG. 5 and FIG. 6, the step S20 may include S21 and S22.

- S21 may include relatively reducing the spacing D between the mold 620 and the flat supporting surface 601 until reaching a position where the microstructured surface 621 of the mold 620 contacts the resin material 630; and
- S22 may include continuing to relatively reduce the spacing between the mold 620 and the flat supporting surface 601 until the preset distance is reached, where the resin material 630 in a liquid state is gradually spread between the microstructured surface 621 and the flat supporting surface 601, where in the step S21 and the step S22, the mold is always kept relatively parallel to the flat supporting surface.

In the step S10, the resin material 630 in a liquid state can be dispensed on the flat supporting surface 601, where the resin material 630 in a liquid state is raised and supported on the flat supporting surface 601, that is to say, the resin material 630 in a liquid state may have a certain height H and volume. For example, a preset amount of the resin material 630 in a liquid state can be arranged on the flat supporting surface 601 by a dispensing device.

In the step S21, the spacing D between the mold 620 and the flat supporting surface 601 is greater than the height H of the resin material 630, and the spacing D between the mold 620 and the flat supporting surface 601 is gradually decreased until a position is reached where the microstructured surface 621 of the mold 620 basically touches the resin material 630, at this time, the spacing D between the mold 620 and the flat supporting surface 601 is basically equal to the Height H of the resin material 630.

It can be understood that, in the step S21, the resin material 630 is still not pressed between the mold 620 and the flat supporting surface 601, therefore, the speed of relative movement between the mold 620 and the flat supporting surface 601 can be adjusted accordingly to shorten the manufacturing time.

In the step S22, as shown in FIG. 7, as the spacing between the mold 620 and the flat supporting surface 601 is further relatively reduced, the resin material 630 in a liquid state is pressed to spread outward between the mold 620 and the flat supporting surface 601, and the horizontal area of the resin material 630 in a liquid state gradually increases, and the height of the resin material 630 in a liquid state gradually decreases, until the spacing D between the mold 620 and the flat supporting surface 601 reaches the preset distance L, as shown in FIG. 8, the spacing D between the mold 620 and the flat supporting surface 601 does not continue to decrease, at this time, the height of the resin material 630 in a liquid state reaches a minimum value, and is the preset distance L, while the horizontal area reaches a maximum value.

In the step S22, in order to ensure that the resin material 630 in a liquid state spreads evenly, the mold 620 and the flat supporting surface 601 are always kept parallel during the relative movement. Furthermore, in the step S22, the speed of the relative movement between the mold 620 and the flat supporting surface 601 can be regulated.

It can be understood that, in the step S22, a barrier element for restricting the spreading of the resin material 630 in a liquid state may be provided between the mold 620 and the flat supporting surface 601, to change the spreading direction of the resin material 630 in a liquid state, so as to control the planar shape of the resin material 630 in a liquid state finally formed by the spreading, so as to obtain the diffusing components 100 of different shapes.

It is worth mentioning that, at the preset distance L, the spread area of the liquid resin material does not exceed the area of the flat supporting surface 601. That is to say, in the step S10, the amount of the resin material 630 in a liquid state arranged on the flat supporting surface 601 can be controlled, so that at the preset distance L, the spread area of the resin material 630 in a liquid state reaches a preset area, so as to obtain the diffusing component 100 of a corresponding size.

Preferably, in the step S10, the resin material 630 in a liquid state may be located at a center position 602 of the flat supporting surface 601, or close to the center position. The person skilled in the art can understand that, when to manufacture multiple diffusing components 100 at the same time, multiple resin materials 630 in a liquid state can be separately arranged in multiple different positions on the flat supporting surface 601, and when the spacing D between the mold 620 and the flat supporting surface 601 is reduced to the preset distance L, the spread multiple resin materials 630 in a liquid state do not interfere with each other, or do not contact with each other.

Further, as shown in FIG. 13, the manufacturing device 600 further includes a moving unit 640 for moving the mold 620 and the supporting plate 610 relative to each other, where the moving unit 640 can move the mold 620 and the supporting plate 610 relative to each other while keeping the mold 620 and the supporting plate 610 parallel to each other, to change the spacing D between the mold 620 and the supporting plate 610. Optionally, the moving unit 640 is used to move the mold 620, where the supporting unit 610 remains stationary. Optionally, the moving unit 640 is used to move the supporting unit 610, and the mold 620 remains stationary. Optionally, the moving unit 640 is used to move the supporting unit 610 and the mold 620 relative to each other at the same time. Those skilled in the art know that the transmission mechanism of the moving unit 640 may be a gear structure, a conveyor belt, a piston, a stepping motor, etc., which is not limited here.

As shown in FIG. 9, in the step S30, the resin material 630 in a liquid state is subjected to light-curing treatment, so that the resin material 630 in a liquid state is solidified and formed, thereby obtaining the diffusing component 100. That is to say, the resin material 630 after being light-cured is the diffusing component 100, which has good toughness and strength.

Further, the manufacturing device 600 further includes a light-curing unit 650, where the light-curing unit 650 is configured to perform a light-curing treatment on the resin material 630 in a liquid state, where the light-curing unit 650 may include a light source for emitting light to achieve light-curing effect.

As shown in FIG. 10, the manufacturing method further includes: S40.

S40 may include removing the light-cured resin material 630 from between the mold 620 and the flat supporting surface 601.

Preferably, the moving unit 640 can move the mold 620 and the flat supporting surface 601 relative to each other to reduce the spacing D between the mold 620 and the flat supporting surface 601, and when the spacing D reaches the preset distance L, the moving unit 640 will not continue to reduce the spacing between the mold 620 and the flat supporting surface 601, and after the light-curing unit 650 performs a light-curing treatment on the resin material 630, the moving unit 640 moves the mold 620 and the flat supporting surface 60 relative to each other to increase the spacing D between the mold 620 and the flat supporting surface 601, so as to facilitate the taking out of the light-cured resin material 630, and facilitate the manufacturing of the diffusing components of a next batch, to achieve industrial batch production.

In the first modified implementation of this preferred embodiment, the manufacturing device 600 can simultaneously manufacture the diffusing component 100 with different thicknesses. As shown in FIG. 11A to FIG. 11C, the microstructured surface 621 of the mold 620 includes a first microstructured surface 6211 and a second microstructured surface 6212 in different planes, where a first spacing D1 between the first microstructured surface 6211 and the flat supporting surface 601 is greater than a second spacing D2 between the second microstructured surface 6212 and the flat supporting surface 601. A first diffusing component 101 can be formed by imprinting correspondingly between the first microstructured surface 6211 and the flat supporting surface 601, and a second diffusing component 102 can be formed by imprinting correspondingly between the second microstructured surface 6212 and the flat supporting surface 601, where the thickness of the first diffusing component 101 is greater than the thickness of the second diffusing component 102.

In the step S10, at least two resin materials 630 are separately arranged on the flat supporting surface 601, where the at least two resin materials 630 respectively correspond to the microstructured surfaces 621 in different planes. As shown in FIG. 11A, the two resin materials 630 are respectively a first resin material 631 and a second resin material 632, where the first resin material 631 is arranged between the first microstructured surface 6211 and the flat supporting surface 601, and where the second resin material 632 is arranged between the second microstructured surface 6212 and the flat supporting surface 601.

It can be understood that the amounts of the liquid first resin material 631 and the liquid second resin material 632 can be adjusted accordingly according to practical requirements, so as to manufacture the required diffusing components 100 with different thicknesses. Further, in the step S20, the spread first resin material 631 and the spread second resin material 632 do not interfere with each other and do not contact each other.

In the second modified implementation of this preferred embodiment, as shown in FIG. 12A to FIG. 12C, the flat supporting surface 601 of the supporting plate 610 includes a first flat supporting surface 6011 and a second flat supporting surface 6012 in different planes, where the spacing between the first flat supporting surface 6011 and the microstructured surface 621 is greater than the spacing between the second flat supporting surface 6012 and the microstructured surface 621. The first diffusing component 101 can be formed by imprinting correspondingly between the microstructured surface 621 and the first flat supporting surface 6011, and the second diffusing component 102 can be formed by imprinting correspondingly between the microstructured surface 621 and the second flat supporting surface 6012, and where the thickness of the first diffusing component 101 is greater than the thickness of the second diffusing component 102.

In the step S10, at least two resin materials 630 are arranged on the first flat supporting surface 6011 and the second flat supporting surface 6012 respectively. As shown in FIG. 12A, the first resin material 631 is arranged on the first flat supporting surface 6011, and the second resin material 632 is arranged on the second flat supporting surface 6012.

Apparently, the person skilled in the art can understand that the manufacturing device 600 can also manufacture more diffusing components 100 with different thicknesses at the same time. For example, the mold 620 may further have more microstructured surfaces 621 in different planes, or the supporting plate 610 may have more flat supporting surfaces 601 in different planes, or both the mold 620 may have multiple microstructured surfaces 621 in different planes and the supporting plate 610 may have corresponding multiple flat supporting surfaces 601 in different planes, which is not limited here.

Further, as shown in FIG. 14, a camera module applying the diffusing component 100 is further provided according to this preferred embodiment, where the camera module includes the diffusing component 100, a light source unit 200 and a light receiving unit 300. The light source unit 200 is used to emit light, the diffusing component 100 is used to modulate the light emitted by the light source unit 200 to form a specific light field distribution, and the light receiving unit 300 receives reflected light. The diffusing component 100 includes the resin substrate 10 and the microlens layer 20, specifically, the microlens layer 20 is integrally formed on the surface of the resin substrate 10 by imprinting.

Further, the microlens layer 20 is a microlens array structure composed of a group of stochastically regularly arranged microlens units 21, where some parameters of the microlens units are all different, so as to prevent light beam from producing interference fringes when the light beam passes through the homogeneous element and propagates in space.

Referring to FIG. 16 and FIG. 17 of the drawings of the specification, a manufacturing method of a resin DOE according to an embodiment of the present invention is illustrated. Specifically, as shown in FIG. 16, the manufacturing method of the resin DOE may include steps: S110, S120, S130 and S140.

The step S110 may include placing a resin material in a liquid state on a first imprinting surface 7110 of a first mold 711 and/or a second imprinting surface 7120 of a second mold 712 of a manufacturing apparatus 710;

- the step S120 may include performing nanoimprinting on the liquid resin material 7200 by operating the first mold 711 and/or the second mold 712 of the manufacturing apparatus 710 in a mold closing manner, so that the liquid resin material 7200 is pressed to spread in a space 7100 between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712 in a filling manner;
- the step S130 may include performing a curing operation on the liquid resin material 7200, so that the liquid resin material 7200 forms, after being cured, a resin DOE 720 with an integrally formed structure; and
- the step S140 may include taking out the resin DOE 720 as a finished DOE by operating the first mold 711 and/or the second mold 712 of the manufacturing apparatus 710 in a mold opening manner.

It is worth noting that since the finished DOE (that is, the resin DOE720 is formed by nano-imprinting a resin material that is integral in itself, it has an integrally formed structure, so the resin DOE720 has advantages of a good toughness, being not apt to break, small thermal expansion, strong structural restoring capability and low cost. In particular, since the resin DOE720 has an integrally formed structure, the manufacturing method of the resin DOE of the present invention can completely address the issue of delamination of the glass substrate from the micro-nano structure of the resin layer in the conventional DOE products. In addition, since the resin DOE720 is not apt to break, the resin DOE720 is used as an optical device in the module, and there is no need to add an additional sensing means for sensing breakage in the module, which reduces the cost of the module end and the cost of the end-user product.

More specifically, in the above embodiments of the present invention, as shown in FIG. 18, the first imprinting surface 7110 of the first mold 711 of the manufacturing apparatus 710 can be implemented as a micro-nano structured surface, so that at least one required microstructured layer 721 may be formed on the side of the resin DOE 720 facing the first imprinting surface 7110 of the first mold 711, for diffracting light waves. It can be understood that, the structural shape and size of the microstructured layer 721 of the resin DOE 720 correspond to the structural shape and size of the micro-nano structured surface of the first imprinting surface 7110 of the first mold 711, that is to say, the present invention can manufacture the resin DOE 720 with the microstructured layer 721 by adjusting the micro-nano structure of the first imprinting surface 7110 of the first mold 711, to allow the resin DOE DOE720 to have the required diffraction performance For example, the first imprinting surface 7110 of the first mold 711 can be, but is not limited to be, implemented as a micro-nano structured surface with a micro-nano structure such as a microlens structure, a Fresnel lens structure, a stepped diffraction structure, and a multi-order phase lens structure.

It is worth mentioning that, in the above embodiments of the present invention, as shown in FIG. 18, the second imprinting surface 7120 of the second mold 712 of the manufacturing apparatus 710 can be implemented as a flat substrate surface, in this way, a flat substrate layer 722 will be formed on the side of the resin DOE 720 facing the second imprinting surface 7120 of the second mold 712. In particular, since the resin DOE720 is formed by integral nano-imprinting an integral liquid resin material through the manufacturing apparatus 710, the microstructured layer 721 of the resin DOE720 is integrally connected to the substrate layer 722, and the microstructured layer 721 of the resin DOE720 and the substrate layer 722 have exactly the same material, that is to say, the microstructured layer 721 integrally extends from the substrate layer 722 to form the resin DOE 720 with an integrated structure, thus completely addressing the issue of delamination of the glass substrate from the resin layer micro-nano structure in conventional DOE products.

Apparently, in other examples of the present invention, the second imprinting surface 7120 of the second mold 712 of the manufacturing apparatus 710 can further be implemented as another micro-nano structured surface, to allow the microstructured layer to be formed on each of two sides of the resin DOE 720, so as to realize the required diffraction effect through the two microstructured layers jointly.

According to the above embodiments of the present invention, the liquid resin material 7200 is preferably implemented as a light-curable liquid resin adhesive, so that the liquid resin material 7200 is cured by light to form the resin DOE 720. It can be understood that, since the liquid resin material 7200 used in the present invention is a light-curable liquid resin adhesive, which can be cured simply by light irradiation without high temperature heating, the finished DOE manufactured by the manufacturing method of the resin DOE according to the present invention has a small thermal expansion, and has a small structural difference from the design, which facilitates the improvement of the manufacturing quality of the resin DOE720.

Exemplarily, as shown in FIG. 18, in the step S110 of the manufacturing method of the resin DOE according to the present invention: after the manufacturing apparatus 710 and the liquid resin material 7200 are prepared, a preset weight of liquid resin material 7200 is dispensed on a specific region 7101 on the second imprinting surface 7120 of the second mold 712 of the manufacturing apparatus 710. In other words, on a central region of the second imprinting surface 7120 of the second mold 712 of the manufacturing apparatus 710, a preset weight of light-curable liquid resin adhesive (i.e., liquid resin material 7200 is dispensed. Apparently, in other examples of the present invention, the liquid resin material 7200 can also be dispensed on the first imprinting surface 7110 of the first mold 711 of the manufacturing apparatus 710, or the liquid resin material 7200 may further be dispensed on the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712 of the manufacturing apparatus 710, to allow each of the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712 has the liquid resin material 7200 dispensed thereon.

Preferably, as shown in FIG. 18, the specific region 7101 can be implemented as the central region on the second imprinting surface 7120 of the second mold 712, to allow the liquid resin material 7200 located at the specific region 7101 to spread outward from the center of the second imprinting surface 7120 when being pressed, so as to ensure that the liquid resin material 7200 can spread evenly to fill the space 7100 between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712, to ensure that the resin DOE 720 has a high consistent density distribution. In particular, using the central region of the second imprinting surface 7120 as the specific region 7101 can further effectively prevent the liquid resin material 7200 from spreading to the position beyond the second imprinting surface 7120 before filling the space 7100 between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712.

Apparently, in another example of the present invention, the specific region 7101 can also be implemented as a non-central region on the second imprinting surface 7120 of the second mold 712 (such as on an edge region of the second imprinting surface 7120, in this way, the liquid resin material 7200 will spread inwardly from the edge of the second imprinting surface 7120 to fill up the space 7100 between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712.

In addition, the preset weight of the present invention may be obtained according to the volume of the space 7100 between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712 being converted into the weight of the liquid resin material 7200. Apparently, in other examples of the present invention, the preset weight can also be preset based on experience or the size of the second imprinting surface 7120 of the second mold 712, as long as it can ensure that the liquid resin material 7200 can fill up the space 7100, which is not repeated in the present invention.

According to the above embodiments of the present invention, as shown in FIG. 17, the step S120 of the manufacturing method of the resin DOE may include steps of: S121, S122 and S123.

The step S121 may include operating the first mold 711 or the second mold 712 to allow the center of the first imprinting surface 7110 of the first mold 711 to correspond to the center of the second imprinting surface 7120 of the second mold 712, and the first imprinting surface 7110 of the first mold 711 to be parallel to the second imprinting surface 7120 of the second mold 712;

- the step S122 may include gradually reducing the spacing between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712 to a preset distance while keeping the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712 in parallel with each other; and
- the step S123 may include pressing the liquid resin material 7200 to spreadingly fill the space 7100 outwardly from the center between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712.

Exemplarily, as shown in FIG. 19, first, the first imprinting surface 7110 of the first mold 711 is disposed toward the second imprinting surface 7120 of the second mold 712 with their centers aligned with each other, and the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712 are parallel to each other; then, the first mold 711 is operated to gradually reduce the spacing between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712, at this time, the liquid resin material 7200 will spread outwards from the center in the space 7100 between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712; finally, when the first imprinting surface 7110 of the first mold 711 contacts the liquid resin material 7200 on the second imprinting surface 7120 of the second mold 712, the spacing between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712 is further gradually reduced, until a preset distance is reached. At the same time, the liquid resin material 7200 is pressed to spreadingly fill the space 7100 outwardly from the center between the first imprinting surface 7110 of the first mold 711 and the second imprinting surface 7120 of the second mold 712.

Preferably, the liquid resin material 7200 does not spread beyond the second imprinting surface 7120 of the second mold 712, and the first imprinting surface 7110 of the first mold 711 is always parallel to the second imprinting surface 7120 of the second mold 712 in the process of spacing reduction, so as to ensure that the liquid resin material 7200 is subjected to a homogeneous pressing force, and then evenly spreads outwards from the center to evenly fill the space 7100 of the manufacturing apparatus 710.

It can be understood that the preset distance in the present invention can be preset according to the required thickness of the resin DOE 720, so as to manufacture a finished DOE with a thickness meeting the requirement.

It is worth noting that since the liquid resin material 7200 is implemented as a light-curable liquid resin adhesive, it needs to be cured under the condition of light irradiation to form the resin DOE 720, so the first mold 711 and/or the second mold 712 of the manufacturing apparatus 710 according to the present invention need to be made of a light-transmitting material such as quartz or glass, so that when the first mold 711 and the second mold 712 of the manufacturing apparatus 710 are in the mold closed state, the light emitted by an external light source can pass through the first mold 711 and/or the second mold 712 to irradiate the liquid resin material 7200, to allow the liquid resin material 7200 to be cured under the condition of light irradiation to form the resin DOE720.

Preferably, the first mold 711 of the manufacturing apparatus 710 is made of a light-transmitting material, so as to allow the light emitted by the external light source to irradiate on a side of the liquid resin material 7200 facing towards the first imprinting surface 7110 of the first mold 711 first after the light passes through the first mold 711; and then irradiate on a side of the liquid resin material 7200 facing towards the second imprinting surface 7120 of the second mold 712, to allow the side of the liquid resin material 7200 facing towards the first imprinting surface 7110 of the first mold 711 to be subjected to the light irradiation first to be cured to form the microstructured layer 721 of the resin DOE 720, so as to prevent the side of the liquid resin material 7200 facing towards the second imprinting surface 7120 from being irradiated to be cured and form the flat substrate layer 722 of the resin DOE 720 first and adversely affecting the curing and forming quality of the microstructured layer 721 accordingly, thereby facilitating the improvement of the imprinted quality of the microstructured layer 721 of the resin DOE72 0.

Exemplarily, as shown in FIG. 20, in the step S130 of the manufacturing method of the resin DOE of the present invention: light irradiation treatment is performed on the resin material 7200 through the first mold 711, and after the specified dose is reached, the light irradiation (or exposure) is stopped, to allow the liquid resin material 7200 to be light-cured to form the resin DOE 720 with an integrally formed structure.

According to the above embodiments of the present invention, in the step S140 of the manufacturing method of the resin DOE: as shown in FIG. 21, the mold opening operation is performed on the first mold 711 and the second mold 712 of the manufacturing apparatus 710 to expose the resin DOE 720 to take out the resin DOE 720 as a finished DOE manufactured by the present invention. In other words, the first mold 711, the resin DOE 720 and the second mold 712 are separated, the first mold 711 and the second mold 712 can be reused, and the separated resin DOE 720 is just the required DOE finished product. It can be understood that precisely because the manufacturing apparatus 710 of the present invention adopts the integrated micro-nano imprinting technology, it has good compatibility with the original nano-imprinting process, and can share the imprinting mold (that is, the first mold