Patent ID: 6278107
Filing Date: 2001-08-21
Classification: G01D

Abstract:
An optical reader for a high-resolution optic coder comprising an emitter (10) emitting a light beam (22), a detector (11) for detecting this beam, a coding disk (40) of which an angular position must be determined, reflectors for (21, 20) deflecting the beam (22) emitted by the emitter (10) toward the detector (11) and a defractor (30) for diffracting the beam located on the coding disk(40), wherein the emitter (10) and the detector (11) are situated in one plane (12) parallel to the coding disk (40) which is configured between the plane (12) containing the emitter (10) and the detector (11) on one side, and the reflectors (20, 21), on another side, the reflectors (20, 21) comprising at least two reflecting surfaces (20, 21) each subtending a given angle with said plane (12) containing the emitter (10) and the detector (11), a first one (20) of said reflecting surfaces being arranged for deflecting the light beam (22) towards a second one (21) of said reflecting surfaces, the emitter (10) and the detector (11) being aligned along a half-line parallel to a radius of the coding disk (40).