US 12,072,618 B2
Light source device and projection display apparatus
Takaaki Tanaka, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Jun. 16, 2021, as Appl. No. 17/349,221.
Claims priority of application No. 2020-109220 (JP), filed on Jun. 25, 2020.
Prior Publication US 2021/0405517 A1, Dec. 30, 2021
Int. Cl. G03B 21/20 (2006.01); G02B 5/26 (2006.01); G02B 5/30 (2006.01); G02B 27/28 (2006.01); G03B 33/12 (2006.01)
CPC G03B 21/2073 (2013.01) [G02B 5/26 (2013.01); G02B 5/3083 (2013.01); G02B 27/283 (2013.01); G03B 21/2013 (2013.01); G03B 21/2033 (2013.01); G03B 33/12 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A light source device comprising:
a plurality of first laser light sources, a second laser light source, and a plurality of third laser light sources;
a first polarization mirror that combines light from the plurality of first laser light sources and transmits light from the second laser light source;
a dichroic mirror that combines the light from the plurality of first laser light sources and the light from the second laser light source;
a second polarization mirror that combines light from the plurality of third laser light sources and transmits the light from the plurality of first laser light sources and the light from the second laser light source;
a retardation plate that converts polarization of the light from the second polarization mirror into circular polarization; and
a filter element that reflects light from the retardation plate.