Rotary optical encoder employing multiple sub-encoders with common reticle substrate

摘要: A rotary optical position encoder for detecting angular includes a light source, monolithic scale disk including an pattern, reticle substrate sets of aperture patterns between the source and disk, detection conversion circuitry, digital processing circuitry. The substrate, circuitry form plurality sub-encoders at positions about rotational axis, each sub-encoder having path extending from to via respective set pattern. is operative combine output values generate value. can include incremental encoders that provide high-resolution indications with improved thermally stability due use shared substrate. Additional zero-reference or “index” as well coarse absolute position.