US 11,982,550 B2
Encoder
Shuichi Nagai, Osaka (JP); Masaru Shiraishi, Osaka (JP); Junya Aso, Kyoto (JP); Toshihiro Koga, Osaka (JP); and Takuma Katayama, Kyoto (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 18/044,215
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Oct. 4, 2021, PCT No. PCT/JP2021/036540
§ 371(c)(1), (2) Date Mar. 7, 2023,
PCT Pub. No. WO2022/097399, PCT Pub. Date May 12, 2022.
Claims priority of application No. 2020-185685 (JP), filed on Nov. 6, 2020.
Prior Publication US 2023/0358574 A1, Nov. 9, 2023
Int. Cl. G01D 5/347 (2006.01)
CPC G01D 5/3473 (2013.01) 22 Claims
OG exemplary drawing
 
1. An encoder comprising:
a board that rotates or moves linearly, the board including a plurality of reflection structures and a code including a light reflector or a light transmissive part and disposed adjacent to the plurality of reflection structures in a plan view of the board;
an irradiator that irradiates the plurality of reflection structures with light to be reflected on the plurality of reflection structures; and
a light receiver that receives the light reflected on the plurality of reflection structures, wherein:
each of the plurality of reflective structures has a surface in a convex or concave shape, and
each of the plurality of reflection structures has a width that is an integral multiple of a width of the light reflector or the light transmissive part.