Title:
OPTICAL LOW PASS FILTER AND IMAGING DEVICE PROVIDED WITH OPTICAL LOW PASS FILTER
Document Type and Number:
WIPO Patent Application WO/2015/141363
Kind Code:
A1
Abstract:
An optical low pass filter (30) is provided with a perpendicular separation birefringent plate (31), a 45° separation birefringent plate (32), and a 135° separation birefringent plate (33). The 45° separation birefringent plate (32) and 135° separation birefringent plate (33) are disposed so as to be next to each other. The thickness of the 45° separation birefringent plate (32) is roughly equal to that of the 135° separation birefringent plate (33). The thicknesses of the 45° separation birefringent plate (32) and the 135° separation birefringent plate (33) are both less than that of the perpendicular separation birefringent plate (31). The position (point Pa1) of the incidence of incident light (L) on the perpendicular separation birefringent plate (31) roughly overlaps with the approximate center of a square separation pattern (points P11, P12, P13, and P14) when viewed from the incident light side.
Inventors:
SHOGAKI TATSUYA (JP)
Application Number:
PCT/JP2015/054460
Publication Date:
September 24, 2015
Filing Date:
February 18, 2015
Export Citation:
Assignee:
DAISHINKU CORP (JP)
International Classes:
G02B27/46; G02B5/30; H04N5/225
Domestic Patent References:
| WO2008152781A1 | 2008-12-18 |
Foreign References:
| JP2004125857A | 2004-04-22 | |||
| JP2007235890A | 2007-09-13 | |||
| JPH10229525A | 1998-08-25 |
Attorney, Agent or Firm:
ARC PATENT ATTORNEYS' OFFICE (JP)
Patent business corporation ARC PATENT ATTORNEYS' OFFICE (JP)
Patent business corporation ARC PATENT ATTORNEYS' OFFICE (JP)
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