Zoom optical system and image projection apparatus having the same | Patent Publication Number 20150234167

US 20150234167 A1

Patent NumberUS 09523907 B2

Application Number14624403

Filled DateFeb 17, 2015

Priority DateFeb 17, 2015

Publication DateAug 20, 2015

Original AssigneeCanon Inc.

Current AssigneeCanon Inc.

Inventor/ApplicantsTakashi Ode

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