Optical coordinate detection apparatus

Details Optical coordinate detection apparatus Optical coordinate detection apparatus

1990-06-29

1991-09-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250205, 340712, G01V

Patent

active

050515748

ABSTRACT:
The present optical detection apparatus is adapted to measure an individual light reception value received by respective photodetectors when the light is interrupted by an object and the driving amount for light emission of the respective light emitting devices is controlled to be equal, compute and store the individual driving amount for light emission of the respective light emitting devices so that the individual light reception value may be kept constant and drive the respective light emitting devices in accordance with the individual driving amount for light emission. Accordingly, variation of the light reception value of the respective photodetectors may be eliminated thus preventing erroneous detection of an object.

REFERENCES:
patent: 3775560 (1973-11-01), Ebeling et al.
patent: 3860754 (1975-01-01), Johnson et al.
patent: 4710759 (1987-12-01), Fitzgibbon
patent: 4813642 (1989-03-01), Hasegawa et al.
patent: 4904857 (1990-02-01), Ando et al.

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