Optical coordinate input apparatus

Details Optical coordinate input apparatus Optical coordinate input apparatus

1997-05-28

1998-09-15

Hofsass, Jeffery A.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345156, G09G 500

Patent

active

058086064

ABSTRACT:
In an optical coordinate input apparatus, the light emitting elements 3a and the light receiving elements 3b of a surface-mounted type constituting the photocouplers 3 are used and mounted on the substrate 2 in close contact with the substrate 2 and the photocouplers 3 arranged on the rear side 2d are displaced from the photocouplers 3 arranged on the front side 2c by half a pitch. Therefore, the lines 3c of action of the photocouplers 3 can be made close to the substrate and the resolution can be improved to twofold while there is not produced such a difference of the detection position that will cause practical inconvenience.

REFERENCES:
patent: 4774404 (1988-09-01), Hasegawa et al.
patent: 4812830 (1989-03-01), Doering
patent: 5543589 (1996-08-01), Buchana et al.

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