Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-05-21
1976-09-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231SE, H01J 314
Patent
active
039833917
ABSTRACT:
Reflective optical encoder for monitoring the movement of a machine tool component or the like. The encoder comprises a code disc having a code track thereon in the form of alternating radiation transmissive and radiation opaque areas. A source of radiation and at least two detectors are supported on one side of the code disc while a reflector is supported on the opposite side. Radiation from the source is directed through the code track to the reflector and is reflected off of the reflector back through the code track to the detectors such that the detectors will receive radiation modulated by the code track as a function of the movement of the code disc.
The reflector is preferably provided with an aspheric reflector surface, and most preferably, with a conical reflector surface which can be adjusted in orientation to enable radiation directed to one of the detectors to be retarded in phase by desired amounts relative to radiation directed to the other detector to permit maximizing of the system resolution and to determine direction of rotation.
The encoder system provided eliminates the need for the slit plate of conventional encoders and, in general, provides a low cost, medium resolution encoder having a minimum number of parts and reduced tolerance requirements.
REFERENCES:
patent: 3524067 (1970-08-01), West
patent: 3544988 (1970-12-01), Astheimer
patent: 3742486 (1973-06-01), Skidmore
patent: 3833807 (1974-09-01), Takeda
patent: 3842261 (1974-10-01), MacGovern et al.
patent: 3879136 (1975-04-01), Takeda
Blair Homer O.
Glanzman Gerald H.
Itek Corporation
Nathans Robert L.
Nelms David C.
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