Patent ID: 6600151
Filing Date: 2003-07-29
Classification: G01D

Abstract:
An optical encoder assembly, for an optical encoder for determining rotation of a rotatable shaft, comprising:a) an encoder housing non-engageable with the shaft; b) a first subassembly including: (1) a receiver plate attached to the encoder housing, having a first side and a substantially opposing second side, and having a through hole and a window both extending from the first side to the second side, wherein the through hole is engageable with the shaft, and (2) an encoder mask attached to the first side of the receiver plate, having a shaft hole engageable with the shaft, and having a mask grating disposed over the window; and c) a second subassembly attached to the encoder housing and including a light emitter and a light detector, wherein the light emitter is aligned to face the first side of the receiver plate and is disposed over the mask grating, and wherein the light detector is attached to the second side of the receiver plate and is disposed over the window.