US 12,072,616 B2
Wavelength conversion device, light source device, and projector
Toshiaki Hashizume, Okaya (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Mar. 29, 2022, as Appl. No. 17/706,738.
Claims priority of application No. 2021-054821 (JP), filed on Mar. 29, 2021.
Prior Publication US 2022/0308433 A1, Sep. 29, 2022
Int. Cl. G03B 21/20 (2006.01); G02B 26/00 (2006.01); G03B 21/16 (2006.01)
CPC G03B 21/204 (2013.01) [G02B 26/008 (2013.01); G03B 21/16 (2013.01); G03B 21/208 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A wavelength conversion device comprising: a motor having a rotation axis and a hollow space; a wavelength converter converting incident first light in a first wavelength band to second light in a second wavelength band that is different from the first wavelength band; an optical element condensing the first light onto the wavelength converter, the optical element coupled to a rotor part of the motor; and a coupling member thermally coupled to the wavelength converter, wherein an optical axis of the optical element and the rotation axis are shifted from each other at least a part of the coupling member is arranged in the hollow space, and the motor changes a position of incidence of the first light on a light incident surface of the wavelength converter by rotating the optical element about the rotation axis, wherein a gap is formed between a light source casing and the coupling member; the optical element is held between the two ends of the rotor and the optical element overlaps the gap.