Invention Grant
- Patent Title: Projection optical system including movable lens groups and image display apparatus
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Application No.: US15707565Application Date: 2017-09-18
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Publication No.: US10241308B2Publication Date: 2019-03-26
- Inventor: Yohei Takano , Hibiki Tatsuno , Nobuyuki Arai , Hirotoshi Nakayama
- Applicant: Ricoh Company, Ltd.
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2013-105851 20130520
- Main IPC: G03B21/28
- IPC: G03B21/28 ; G02B17/08 ; G02B13/16 ; G02B3/04 ; G02B5/10 ; G03B21/14
Abstract:
There is provided a projection optical system capable of projecting an image formed on an image forming unit on a projection plane, which has an extremely short projection distance and a small size.
Public/Granted literature
- US20180003934A1 PROJECTION OPTICAL SYSTEM AND IMAGE DISPLAY APPARATUS Public/Granted day:2018-01-04
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