Patent ID: 7095011
Filing Date: 2006-08-22
Classification: G01D

Abstract:
1. A photoelectric encoder comprising: a light source; a scale including a first optical grating for receiving irradiation of light from said light source; a plurality of light-receiving elements each having a light acceptance surface for incidence of an optical signal as generated based on the light falling onto said first optical grating, said plurality of light-receiving elements detecting a plurality of phase-different optical signals; and a second optical grating including more than one light shield portion disposed above each light acceptance surface of said plurality of light-receiving elements, and an optical receipt chip including said plurality of light-receiving elements and said second optical grating, wherein said optical receipt chip further includes, a contact portion provided for each of said plurality of light-receiving elements and connected to said light shield portion beneath said light shield portion with electrical conductivity while being in contact with said light acceptance surface, and an electrical wiring line provided for each of said plurality of light-receiving elements and connected to said light shield portion, wherein said plurality of light-receiving elements are disposed movably relative to said scale along a measurement axis and disposed along said measurement axis so that each light acceptance surface is slanted with respect to an extending direction of said light shield portion.