Invention Grant
- Patent Title: Lens for projection and projection-type display apparatus
- Patent Title (中): 投影型投影型显示装置用透镜
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Application No.: US14515727Application Date: 2014-10-16
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Publication No.: US09285564B2Publication Date: 2016-03-15
- Inventor: Chikara Yamamoto
- Applicant: FUJIFILM Corporation
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Corporation
- Current Assignee: FUJIFILM Corporation
- Current Assignee Address: JP Tokyo
- Agency: Young & Thompson
- Priority: JP2012-095342 20120419
- Main IPC: G02B9/62
- IPC: G02B9/62 ; G02B13/00 ; G02B13/16 ; G02B27/10 ; G02B13/18 ; H04N9/31

Abstract:
A lens for projection substantially consists of a negative first lens with its concave surface facing a reduction side, a positive second lens with its concave surface facing the reduction side, a negative third lens with its concave surface facing a magnification side, a positive fourth lens with its convex surface facing the reduction side, a positive fifth lens and a positive sixth lens in this order from the magnification side. The reduction side is telecentric. The following conditional formulas (1) and (2) about refractive power P4 of a reduction-side surface of the second lens, refractive power P5 of a magnification-side surface of the third lens, and focal length f of an entire system are satisfied: −3.0≦1/(P4×f)≦−0.4 (1); and −2.0≦1/(P5×f)≦−0.2 (2).
Public/Granted literature
- US20150036229A1 LENS FOR PROJECTION AND PROJECTION-TYPE DISPLAY APPARATUS Public/Granted day:2015-02-05
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