Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
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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Allen Stephone B.
Nelms David C.
The Boeing Company
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