Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-12-28
1991-03-05
Willis, Davis L.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
341 31, G01V 904
Patent
active
049980149
ABSTRACT:
An optical coordinate-input system. A plurality of pairs of light-emitting and light-receiving elements are mutually opposed on a two-dimensional input surface and arranged along the X and Y coordinate axes. A driver causes the light-emitting elements to sequentially emit light so as to scan the surface with light beams. A circuit sequentially binarizes signals from the light-receiving elements. When the interruption of the light beams occurs at a portion of the surface, signals from those light-receiving elements corresponding to this portion are also binarized by the circuit. A memory stores the binarized data in the form of units each consisting of a plurality of bits arranged in a sequence corresponding to the arrangement of the light-emitting and light-receiving elements along the X and Y coordinate axes. This writing is controlled so that that data is stored in different addresses. Whenever required, stored data is transmitted, while it is in the same form. Therefore, it is possible to read the necessary data alone at any desired time through simple procedures, thereby increasing the processing speed.
REFERENCES:
patent: 4645920 (1987-02-01), Carroll et al.
patent: 4672195 (1987-06-01), Golborne et al.
patent: 4812642 (1989-03-01), Hasegawa et al.
Alps Electric Co. ,Ltd.
Shami K.
Shoup Guy W.
Willis Davis L.
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