- Patent Title: Projection optical system and projection-type image display device
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Application No.: US14801100Application Date: 2015-07-16
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Publication No.: US09696614B2Publication Date: 2017-07-04
- Inventor: Toshihiko Sakai
- Applicant: SEIKO EPSON CORPORATION
- Applicant Address: JP Tokyo
- Assignee: SEIKO EPSON CORPORATION
- Current Assignee: SEIKO EPSON CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP2014-152641 20140728
- Main IPC: G03B21/14
- IPC: G03B21/14 ; G02B13/16 ; G02B27/09 ; G02B9/64 ; G02B7/04 ; G02B15/14 ; G02B5/00
Abstract:
A projection optical system includes: a plurality of lenses; a lens frame that holds at least one lens of the plurality of lenses; a first diaphragm provided on the light incident side of the lens frame; and a second diaphragm provided on the light exiting side of the lens frame.
Public/Granted literature
- US20160025954A1 PROJECTION OPTICAL SYSTEM AND PROJECTION-TYPE IMAGE DISPLAY DEVICE Public/Granted day:2016-01-28
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