Patent ID: 7612327
Filing Date: 2009-11-03
Classification: G01D

Abstract:
1. An optical encoder comprising: a light emitting section; a light receiving section having a plurality of light receiving elements placed in array along one direction in a region that can be reached by light derived from the light emitting section, and a mover having light-on portions which make the light incident on the light receiving elements and light-off portions which inhibit the light from being incident on the light receiving elements, the light-on portions and the light-off portions alternately pass through specified positions corresponding to the light receiving elements when the mover moves along the one direction, wherein the optical encoder detects movement of the mover, the optical encoder further comprising: a signal processing section to which a first light reception signal and second, third and fourth light reception signals shifted in phase by 90°, 180°, 270° respectively from the first light reception signal are inputted from the light receiving section, and which balances gate delays due to signal processing for each of the first to fourth light reception signals with one another.