Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-06-24
1978-03-07
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250205, 356169, H01J 314
Patent
active
040781739
ABSTRACT:
An opto-electronic transducer for determining position and/or velocity of one member with respect to another member is provided with light amplitude control. The transducer is comprised of a scale with a transmission grating on a first track and an indexing bar near each end of a second track adjacent the first, and a reticle with two sections of the same grating, one section being offset spatially one quarter cycle with respect to the other section for producing quadrature signals through two photosensors opposite the first track from which relative position and/or velocity between the reticle and the scale can be determined. A slit is provided in the reticle in order to provide information for determining position relative to the indexing bars. A single photosensor opposite the second track is used both to detect the indexing bars and to provide a feedback control signal to maintain the amplitude of light illuminating the scale and reticle constant.
REFERENCES:
patent: 3427463 (1969-02-01), Weyrauch
patent: 3639768 (1972-02-01), Mancini
patent: 3670202 (1972-06-01), Paine et al.
patent: 3912926 (1975-10-01), Coulbourn
patent: 3983390 (1976-09-01), Llop
Nelms David C.
Pertec Computer Corporation
Sunderdick Vincent J.
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