Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-01-23
1990-06-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340712, H01J 4014
Patent
active
049335448
ABSTRACT:
A touch panel apparatus which, when attached to a display having a substantially cylindrical display surface, reduces the effects of parallax by having a first set of plural light source - photo-detector pairs provided adjacent the cylindrical display surface for generating and detecting a first set of parallel light beams passing across the cylindrical display surface of the display, a second set of plural light source photo-detector pairs provided adjacent the cylindrical display surface for generating and detecting a second set of parallel light beams passing across the cylindrical display surface of the display, wherein the first and second sets of light beams are non-parallel relative to the principal direction of cylindrical curvature of the cylindrical display surface, and a process circuit connected to the first and second sets of light source - photo-detector pairs for determining coordinates by detecting interrupted light beams.
REFERENCES:
patent: 3764813 (1973-10-01), Clement et al.
patent: 3775560 (1973-11-01), Ebeling et al.
patent: 4198623 (1980-04-01), Misek et al.
patent: 4247767 (1981-01-01), O'Brien et al.
patent: 4517559 (1985-05-01), Deitch et al.
Beck George
Nelms David C.
Shaw, Jr. Philip M.
Sony Corporation
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