| 主权项 |
1. A code plate of an optical encoder, comprising:
a planar portion that is located on a surface to which a light flux for detection is applied; and a non-planar portion that is arranged alternatively with the planar portion on the surface and is comprised of multiple convex structures and concave structures arranged continuously intersecting to a parallel direction of arranging the planar portion and the non-planar portion, wherein the convex structure and the concave structure have a V-shaped structure in the cross-section formed by two planer slopes intersecting each other at a top portion thereof, and when a width of the non-planar portion in the parallel direction is defined as WR, a projected length of the top portion for the surface plane of the code plate is defined as WC, and projected lengths of the two slopes SL1 and SL2 for the surface plane of the code plate are defined as WF1 and WF2, respectively, WC is equal to or more than 2.83 μm, and the following equations (1) and (2) are satisfied:
WF1+WF2+WC>WR (1)WC/(WF1+WF2+WC)≦0.09 (2) |
