Optical coordinate data entry device with integral lens and spac

Details Optical coordinate data entry device with integral lens and spac Optical coordinate data entry device with integral lens and spac

1986-05-19

1988-04-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, G01V 904

Patent

active

047391600

ABSTRACT:
An optical coordinate data entry device mounted on the face of a display device. The entry device comprises an array of light-emitting devices, an array of light-receiving devices corresponding to the light-emitting devices, and a condenser lens member extending parallel to the arrays for directing the light beams coming from the light-emitting devices onto the light-receiving devices. A spacer acting also as a light-blocking member is formed integrally with the lens member.

REFERENCES:
patent: 3551683 (1968-09-01), Tothill
patent: 3694658 (1972-09-01), Watson et al.
patent: 3727069 (1973-04-01), Crittenden et al.
patent: 3819938 (1974-06-01), Kornrumpf et al.

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