Precision infrared position detector apparatus for touch screen

Details Precision infrared position detector apparatus for touch screen Precision infrared position detector apparatus for touch screen

1988-06-30

1990-01-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340712, G01V 904

Patent

active

048915084

ABSTRACT:
The precision infrared position detector apparatus uses an information display device that has a substantially cylindrical shaped screen to limit curvature of the screen to a single dimension. In addition, to compensate for this curvature, a flexible printed circuit board is used to align the row of infrared light sources and detectors along the same curvature as the screen of the information display device. A first flexible printed circuit board is equipped with a single row of infrared light sources while a second flexible printed circuit board is equipped with a signal row of corresponding infrared light detectors. A frame member is used to bend the flexible printed circuit board into a substantially cylindrical shape that matches the curvature of the screen of the information display device. In this manner, the first and second flexible printed circuit boards are placed at opposite ends of the rectangular shaped screen of the information display device to thereby transmit a plurality of parallel beams of infrared light, each of which is a predetermined distance above the screen of the information display device even though the screen of the information display device curves in the shape of a cylinder.

REFERENCES:
patent: 4437632 (1988-04-01), Kawabe et al.
patent: 4737631 (1988-04-01), Sasaki et al.
patent: 4751379 (1988-06-01), Sasaki et al.
patent: 4764885 (1988-08-01), Greanias et al.
patent: 4766424 (1988-08-01), Adler et al.
patent: 4812830 (1989-03-01), Doering

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