Optical position sensor having rigidly fixed read head

Details Optical position sensor having rigidly fixed read head Optical position sensor having rigidly fixed read head

1992-04-21

1993-06-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214PR, H01J 4014

Patent

active

052181995

ABSTRACT:
An optical position sensor comprising an encoder plate (52) that includes a variable density code pattern (54) is disclosed. Disposed in contact with the encoder plate is a bearing plate (58) having a read head (60) rigidly mounted thereto. The encoder plate (52) is coupled by a flexible aligner (62) and a shaft (64) to an object whose position is to be sensed such that the bearing plate (58) remains in contact with the encoder plate (52) as the object moves. Thus, no gap occurs between the read head and the encoder plate. A series of channels (70) disposed in the bearing plate contain a lubricant having approximately the same index of refraction as the encoder plate (52) and bearing plate (58). The lubricant reduces abrasion between the encoder plate and bearing plate as well as reduces reflective losses.

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