Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-02-24
1989-12-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, 341 31, G01V 904
Patent
active
048884790
ABSTRACT:
A touch panel apparatus having a display, a first beam generator for generating a first set of beams skewed to the right, arranged in parallel to each other and aligned from the upper left to the lower right relative to the display surface of the display, a first beam scanner coupled to the first beam generator for scanning the display surface by the first set of beams with a predetermined sequence, a second beam generator for generating a second set of beams skewed to the left, arranged in parallel to each other and aligned from the upper right to the lower left relative to the display surface of the display, a second beam scanner coupled to the second beam generator for scanning the display surface by the second set of beams with a predetermined sequence, a first calculator for determining a first address based on an interrupted beam first appearing in the alignment sequence of the first set of beams, and a second calculator for determining a second address based on an interrupted beam first appearing in the alignment sequence of the second set of beams.
REFERENCES:
patent: 3025406 (1962-03-01), Stewart et al.
patent: 3584226 (1971-06-01), Lerner
patent: 4313109 (1982-01-01), Funk et al.
patent: 4347438 (1982-08-01), Spielman
patent: 4645920 (1987-02-01), Carroll et al.
patent: 4794248 (1988-12-01), Gray
Nelms David C.
Shami Khaled
Sony Corporation
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