US 12,228,847 B2
Light source device and projection-type display apparatus
Takaaki Tanaka, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANANGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Jun. 28, 2023, as Appl. No. 18/215,360.
Application 18/215,360 is a continuation of application No. 17/538,350, filed on Nov. 30, 2021, granted, now 11,726,396.
Application 17/538,350 is a continuation of application No. PCT/JP2020/029754, filed on Aug. 4, 2020.
Claims priority of application No. 2019-143874 (JP), filed on Aug. 5, 2019.
Prior Publication US 2023/0341757 A1, Oct. 26, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G03B 21/20 (2006.01); G02B 5/02 (2006.01); G02B 27/10 (2006.01); G02B 27/14 (2006.01); G02B 27/28 (2006.01); G03B 21/00 (2006.01)
CPC G03B 21/204 (2013.01) [G02B 5/0221 (2013.01); G02B 27/1026 (2013.01); G02B 27/141 (2013.01); G02B 27/283 (2013.01); G03B 21/006 (2013.01); G03B 21/2013 (2013.01); G03B 21/2066 (2013.01); G03B 21/2073 (2013.01); G03B 21/208 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A light source device comprising:
a blue laser light source;
a green laser light source;
a red laser light source;
a fluorescent plate that is excited by a part of the blue laser light and emits fluorescent light including a green component and a red component;
a first dichroic mirror that combines another part of the blue laser light, green laser light emitted from the green laser light source, and red laser light emitted from the red laser light source, to generate combined laser light;
a second dichroic mirror that combines the combined laser light and the fluorescent light emitted from the fluorescent plate,
wherein the generated combined laser light does not enter the fluorescent plate before being combined with the fluorescent light emitted from the fluorescent plate by the second dichroic mirror.