Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-03-25
1989-07-04
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340712, 341 31, G01V 904
Patent
active
048453463
ABSTRACT:
Disclosed is here a coordinate input apparatus in which light sources and light receiving elements opposing thereto with an input operation space therebetween are arranged in an X-axis direction and in an Y-axis direction. The light sources and said light receiving elements form a plurality of pairs and the light sources are sequentially driven to accomplish a scan operation. Coordinates corresponding to the light receiving element of which a light path is interrupted by a coordinate input scan in the input operation space are outputtted as detection signals and as coordinate input data of a position where the light path is interrupted. The apparatus includes a double-precision coordinate calculate unit for calculating, when light paths of two adjacent light receiving elements are simultaneously interrupted, coordinates of an intermediate point associated with coordinates corresponding to the two light receiving elements and a coordiante value correcting unit for achieving a parallax correction on the coordinates calculated by the double-precision calculate unit by use of a correction table.
REFERENCES:
patent: 4672195 (1987-06-01), Golborne et al.
patent: 4692609 (1987-09-01), Pettersson
patent: 4766424 (1988-08-01), Adler et al.
patent: 4766425 (1988-08-01), Tallman et al.
Hasagawa Kazuo
Ouchi Junichi
Sasaki Hiroaki
Alps Electric Co. ,Ltd.
Malaska Stephen L.
Shami Khaled
Shoup Guy W.
Westin Edward P.
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