Optical scale having wires, method for manufacturing optical scale having wires,and optical encode

摘要

An optical scale, a method for manufacturing an optical scale, and an optical encoder. The optical scale includes a plurality of wires provided thereon so that the wires do not intersect each other and each of the tangential directions of the respective wires changes continuously. The optical encoder includes the optical scale, a light source, an optical sensor, and a computing unit. The optical sensor includes a first polarizing layer that splits incident light that is light source light from the light source passed through or reflected on the optical scale and being incident on the first polarizing layer to a first polarization direction, a second polarizing layer that splits the incident light to a second polarization direction, a first photoreceiver that receives first polarized light split by the first polarizing layer, and a second photoreceiver that receives second polarized light split by the second polarizing layer.

主权项

1. An optical scale through or on which light source light from a light source is passed or reflected, the optical scale comprising:
a plurality of wires arranged thereon so that the wires do not intersect each other and each of tangential directions of the wires, having tangent angles with respect to radius directions of the wires, changes continuously, wherein the tangential directions are oriented same in areas in which intervals between adjacent wires are same, and the tangential directions are oriented differently in areas in which the intervals between adjacent wires are different, and a change in each of the tangential directions per rotation of the optical scale is cyclic and the number of cycles of the change is plural.