Invention Grant
- Patent Title: Projection optical system, projector and image reading device
- Patent Title (中): 投影光学系统，投影仪和图像读取装置
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Application No.: US12529920Application Date: 2008-03-05
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Publication No.: US08419191B2Publication Date: 2013-04-16
- Inventor: Osamu Nagase , Yoshitsugu Kono
- Applicant: Osamu Nagase , Yoshitsugu Kono
- Applicant Address: JP Hanamaki-shi
- Assignee: Ricoh Optical Industries, Co., Ltd.
- Current Assignee: Ricoh Optical Industries, Co., Ltd.
- Current Assignee Address: JP Hanamaki-shi
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2007-057526 20070307; JP2008-013116 20080123
- International Application: PCT/JP2008/054431 WO 20080305
- International Announcement: WO2008/111591 WO 20080918
- Main IPC: G03B21/22
- IPC: G03B21/22 ; G03B21/28 ; G02B17/00
Abstract:
An optical system with short total length to project a high quality large image. The system projects an image onto a projection surface, and includes a lens system having a plurality of lenses, and one or more curved mirrors. Light flux of an enlarged image shooting out from the lens system to the projection surface is incident onto a mirror surface of the one of the curved mirrors first of all. Distances OAL and Y satisfy a requirement 20
Public/Granted literature
- US20100097582A1 PROJECTION OPTICAL SYSTEM, PROJECTOR AND IMAGE READING DEVICE Public/Granted day:2010-04-22
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