US 11,815,669 B2
Lens, optical system, projector, and imaging device
Eiji Morikuni, Matsumoto (JP); and Takuro Fushimi, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Aug. 31, 2021, as Appl. No. 17/462,405.
Claims priority of application No. 2020-145440 (JP), filed on Aug. 31, 2020.
Prior Publication US 2022/0066178 A1, Mar. 3, 2022
Int. Cl. G02B 13/16 (2006.01); G02B 3/08 (2006.01); G03B 21/28 (2006.01)
CPC G02B 13/16 (2013.01) [G02B 3/08 (2013.01); G03B 21/28 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A projector comprising:
a lens, the lens comprising:
a first surface;
a second surface opposed to the first surface;
a first outer circumferential part disposed at an outer circumferential side of the first surface;
a second outer circumferential part disposed at an outer circumferential side of the second surface;
a plurality of, three or more, first reference parts provided to the first outer circumferential part;
a plurality of, three or more, second reference parts provided to the second outer circumferential part; and
a first reference surface disposed at an outer circumferential side of the first outer circumferential part and the second outer circumferential part, wherein
the first surface and the second surface have a common design axis,
a first imaginary plane including the plurality of first reference parts and a second imaginary plane including the plurality of second reference parts are perpendicular to the design axis respectively, and
the first reference surface extends in parallel to the design axis; and
a light modulator configured to modulate light emitted from a light source, wherein the lens is configured to project the light modulated by the light modulator.