Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-10-21
1999-11-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, H01J 4014, G01D 536
Patent
active
059819421
ABSTRACT:
The optical encoder is capable of detecting phases at positions which coincide more strictly than the phase detecting positions of a conventional optical encoder, and is thereby capable of outputting less distorted displacement signals with a sufficient averaging effect and detecting the phases more accurately. An amount of a light having passed through a first grating is received directly with a light receiving section and output as an electric signal. On the basis of the fact that the electric signal is varied dependently on a relative displacement between the first grating and the light receiving section, the relative displacement is detected. The light receiving section includes a plurality of grating-like photo detecting devices which have fine widths and are arranged in a grating-like shape in a mixed manner within a minute section so as to correspond to four phases. Further, the photo detecting devices are composed of divided and minute photo detecting elements so as to have widths which are not definite but have such values as to eliminate the distorted component of high orders.
REFERENCES:
patent: 5748373 (1998-05-01), Hane et al.
patent: 5750984 (1998-05-01), Ieki
Okuma Corporation
Pyo Kevin
Westin Edward P.
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