US 11,812,201 B2
Light guide optical device, light source device, and image projection apparatus
Takashi Sasaki, Kanagawa (JP); Yohei Takano, Kanagawa (JP); Kasumi Nakamura, Kanagawa (JP); Kazuhiro Fujita, Tokyo (JP); Makoto Hirakawa, Tokyo (JP); and Shigeaki Imai, Kanagawa (JP)
Assigned to RICOH COMPANY, LTD., Tokyo (JP)
Filed by Takashi Sasaki, Kanagawa (JP); Yohei Takano, Kanagawa (JP); Kasumi Nakamura, Kanagawa (JP); Kazuhiro Fujita, Tokyo (JP); Makoto Hirakawa, Tokyo (JP); and Shigeaki Imai, Kanagawa (JP)
Filed on Apr. 20, 2022, as Appl. No. 17/724,514.
Claims priority of application No. 2021-073662 (JP), filed on Apr. 23, 2021.
Prior Publication US 2022/0345671 A1, Oct. 27, 2022
Int. Cl. G02B 27/09 (2006.01); G02B 27/10 (2006.01); G03B 21/20 (2006.01); H04N 9/31 (2006.01); F21V 8/00 (2006.01)
CPC H04N 9/317 (2013.01) [G02B 6/0096 (2013.01); G02B 27/0994 (2013.01); G02B 27/10 (2013.01); G03B 21/204 (2013.01); G03B 21/2013 (2013.01); G03B 21/2066 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A light source device, comprising:
a light guide optical device including:
an optical path combiner including:
a first deflector configured to deflect first light incident from a first direction to an emission direction;
a second deflector configured to deflect second light incident from a second direction different from the first direction, to the emission direction; and
a transmission portion between the first deflector and the second deflector, the transmission portion configured to transmit third light incident from a third direction different from each of the first direction and the second direction, in the emission direction,
wherein the optical path combiner combines the first light, the second light, and the third light, and emits the combined light to the emission direction,
the light source device further comprising:
a first light source configured to emit the first light;
a second light source configured to emit the second light; and
a third light source configured to emit the third light,
wherein the light guide optical device forms at least one of a conjugate image of the first light source, a conjugate image of the second light source, and a conjugate image of the third light source, in the optical path combiner.