Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-06-13
1989-06-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, G01V 904, G06M 700, H01J 4014
Patent
active
048411418
ABSTRACT:
An optical coordinates inputting apparatus which has a light emitting element array and a photodetector array opposed to the light emitting element array, arranged in X- an Y-axis directions, X-axis and Y-axis multiplexer means sequentially driven as a pair of light emitting element and photodetector of the X- and Y-axis directions, X- and Y-axis signal detecting means for outputting a coordinates signal when a light signal outputted from the driven light emitting element is not photodetected by the opposed photodetector, and switching means for operating either the X-axis or Y-axis multiplexer means, whereby, when the coordinates signal is outputted, the switching means operates the other X- or Y-axis multiplexer means. Thus, the inputting apparatus drives to scan either one of a light emitting element array and a photodetector array in X- or Y-axis direction during a period that coordinates are not inputted to reduce its power consumption.
REFERENCES:
patent: 4645920 (1987-02-01), Carroll et al.
patent: 4672195 (1987-06-01), Golborne et al.
patent: 4749853 (1988-06-01), Salim
patent: 4801797 (1989-01-01), Ohouchi et al.
Alps Electric Co. ,Ltd.
Den William L.
Nelms David C.
Shoup Guy W.
Winters Paul J.
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