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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