Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1993-01-14
1994-02-08
Messinger, Michael
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
25023114, G01J 132, G01D 534
Patent
active
052850587
ABSTRACT:
An optical sensor for monitoring position of a movable object comprising a LED and a phototransistor is provided with control circuitry, which is responsive to an output signal generated by the phototransistor for causing the LED to suspend radiation of light. When the light reflected from a reflective area of the object falls on the phototransistor, the control circuitry turns off the LED as soon as the output of the phototransistor goes below a threshold level signifying that the phototransistor has been turned on. When the light is absorbed by a non-reflective area of the object and the phototransistor is not turned on, the control circuitry turns off the LED after a predetermined time period, which is chosen to be slightly larger than the response time of the phototransistor.
REFERENCES:
patent: 4725723 (1988-02-01), Shimojima
patent: 4757190 (1988-07-01), Ando et al.
patent: 4967676 (1990-11-01), Hagino et al.
patent: 4972078 (1990-11-01), Hasebe et al.
patent: 5132527 (1992-07-01), Karpati
patent: 5223710 (1993-06-01), Pavlak
Asman Sanford J.
Messinger Michael
Schlumberger Industries Inc.
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