Dustproof structure for optical coordinate input apparatus

Details Dustproof structure for optical coordinate input apparatus Dustproof structure for optical coordinate input apparatus

1986-12-05

1988-09-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, G01V 904

Patent

active

047695358

ABSTRACT:
An optical coordinates input apparatus includes pairs of first light emitting elements and first light receiving elements, a plurality of pairs of second light emitting elements and second light receiving element having a light path intersecting a light path of the first light emitting elements and the first light receiving elements, and a filter section disposed on the front side of the light paths of the optical semiconductor elements for passing therethrough a light in the paths. The apparatus further includes a device from preventing a flow of an air containing dust from entering a space between the optical conductor elements and the filter section.

REFERENCES:
patent: 4306147 (1981-12-01), Fukuyama et al.
patent: 4340813 (1982-07-01), Sauer
patent: 4354106 (1982-10-01), Walter
patent: 4384201 (1983-05-01), Carroll et al.
patent: 4387367 (1983-06-01), Fisher
patent: 4672558 (1987-06-01), Beckes et al.

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