Photoelectric switch

Details Photoelectric switch Photoelectric switch

1990-12-10

1992-08-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, G01V 904

Patent

active

051361566

ABSTRACT:
An improved photoelectric switching device for coordinate detection system comprises a first array of light emitting elements, a first array of photo-detecting elements for receiving the light from the first array of light emitting elements and producing a first block signal when the light is blocked by a stylus, such as a finger, a second array of light emitting elements, a second array of photo-detecting elements for receiving the light from the second array of light emitting elements and producing a second block signal when the light is blocked by the stylus wherein the light receiving surfaces of the second array of photo-detecting elements are aligned an angle, such as 180 degrees, with respect to those of the first array of photo-detecting elements, and a control means such as a microcomputer for driving the first and the second array of the light emitting elements and for discriminating the coordinates of the stylus on the display unit which displays a pattern having several regions allocated for certain control of optional equipment. Therefore, the stylus can be detected even if there is an inadvertent operation in either of the first and the second photo-detecting elements due to a strong incidence of ambient light in the lateral direction.

REFERENCES:
patent: 3234512 (1966-02-01), Burkhardt
patent: 3746863 (1973-07-01), Pronovost
patent: 3764813 (1973-10-01), Clement et al.
patent: 4198623 (1980-04-01), Misek
patent: 4703316 (1987-10-01), Sherbeck

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