Photoelectric encoder has a multiplicity of groups of light receiver elements for generation of phase signals with predefined phase differences with pairs of groups arranged to provide an overlap between themselves

摘要

Photoelectric encoder has a scale (104) that generates a periodic light intensity pattern of a given period when illuminated with a light source (102). A multiplicity of groups of light receiver elements can be displaced relative to the scale in order to generate phase signals with predefined phase differences. A multiplicity of light receiver elements are placed next to each other so that the same phase if formed by each group of receivers. Surface centroids are formed on a phase axis (109) of a pair of groups of receivers with a predetermined phase difference so that they overlap.