Patent ID: 9602706
Date: 2017-03-21
CPC Classifications: G02B

Claim:
1. A rotatable operating member comprising: a member configured to have a circumferential surface; and a sheet configured to be fixed to the circumferential surface, wherein a reflectivity of a surface of said sheet is different from a reflectivity of the circumferential surface of said member, wherein said sheet has a plurality of holes formed side by side in a circumferential direction in the circumferential surface, wherein in said sheet, a part of the circumferential surface is exposed from the holes, and said sheet is fixed to the circumferential surface such that both ends of said sheet are opposed to each other in the circumferential direction, and wherein a gap with a width in the circumferential direction substantially equal to a width of the hole in the circumferential direction is provided between both ends of said sheet.