US 9,810,398 B2
Optical device
Seiko Kato, Tokorozawa (JP)
Assigned to CITIZEN WATCH CO., LTD., Tokyo (JP)
Appl. No. 14/359,636
Filed by CITIZEN HOLDINGS CO., LTD., Nishitokyo-shi, Tokyo (JP)
PCT Filed Nov. 9, 2012, PCT No. PCT/JP2012/079193
§ 371(c)(1), (2) Date May 21, 2014,
PCT Pub. No. WO2013/077204, PCT Pub. Date May 30, 2013.
Claims priority of application No. 2011-258133 (JP), filed on Nov. 25, 2011.
Prior Publication US 2014/0347608 A1, Nov. 27, 2014
Int. Cl. G02F 1/1335 (2006.01); F21V 5/00 (2015.01); G02F 1/13 (2006.01); G02B 27/28 (2006.01); G02F 1/01 (2006.01); G03B 21/20 (2006.01); G02F 1/13363 (2006.01)
CPC F21V 5/008 (2013.01) [G02B 27/281 (2013.01); G02F 1/0136 (2013.01); G02F 1/13 (2013.01); G02F 1/133528 (2013.01); G03B 21/2073 (2013.01); G02F 2001/133637 (2013.01); G02F 2001/133638 (2013.01); G02F 2203/04 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An optical device comprising:
a plurality of light sources configured to respectively emit light of a different wavelength;
a stacked wave plate that is configured by a plurality of wave plates disposed in series, transmits the light emitted by the plurality of light sources, and induces a phase difference on polarization components of the transmitted light; and
a plurality of polarization adjusting units configured to receive light from a respective light source and to respectively adjust polarization directions of the light from said respective light source such that an angle between the polarization directions of the light emitted by the plurality of light sources and input to the same stacked wave plate becomes an angle that corrects an orientation angle difference that occurs at the stacked wave plate and is caused by differences in the wavelengths of the light.