Title:
LIGHT TRANSMISSIVE MEMBER FOR COVER OF OPTICAL DEFLECTOR, OPTICAL DEFLECTOR, OPTICAL LENS AND OPTICAL MIRROR
Document Type and Number:
Japanese Patent JP2016033529
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a light transmissive member for cover of an optical deflector, which reduces speckle of laser light without increasing the number of optical elements arranged on an optical path.SOLUTION: An optical deflector 1 scans the reflection direction of laser light made incident to a mirror part 11 by oscillating the mirror part 11. A light transmissive member 5 for cover is mounted to the optical deflector 1. In the light transmissive member 5 for cover, on the surface of a portion making incident light and reflection light to the mirror part 11 penetrate, a speckle elimination pattern 17 is formed so that a sub-wavelength structure area, which has grooves arrayed repeatedly at a cycle shorter than the wavelength of used light and has structural birefringent, is arranged so as to have a portion where optical axis directions to be the array directions of the grooves are different from each other.SELECTED DRAWING: Figure 1
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Inventors:
FUJIMURA YASUHIRO
UMEKI KAZUHIRO
OGAWA MIYUKI
KAWAMURA MASAHISA
UMEKI KAZUHIRO
OGAWA MIYUKI
KAWAMURA MASAHISA
Application Number:
JP2014155499A
Publication Date:
March 10, 2016
Filing Date:
July 30, 2014
Export Citation:
Assignee:
RICOH OPTICAL IND CO
International Classes:
G02B26/10; G02B27/48; H04N1/113
Domestic Patent References:
| JP2010237492A | 2010-10-21 | |||
| JP2011180581A | 2011-09-15 | |||
| JP2009216938A | 2009-09-24 | |||
| JP2013047774A | 2013-03-07 | |||
| JPH08334722A | 1996-12-17 | |||
| JP2007226108A | 2007-09-06 | |||
| JP2012173701A | 2012-09-10 |
Foreign References:
| US20030161029A1 | 2003-08-28 |
Attorney, Agent or Firm:
Shigeo Noguchi