Non-contact X,Y digitizer using two dynamic ram imagers

Details Non-contact X,Y digitizer using two dynamic ram imagers Non-contact X,Y digitizer using two dynamic ram imagers

1983-04-01

1985-03-26

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250221, G01S 516, G01S 750

Patent

active

045075573

ABSTRACT:
Apparatus is disclosed for detecting the position of an object within a viewing field, such as a CRT display screen. The apparatus includes point sources of radiation arranged at spaced locations around the edge of the viewing field and a retro-reflective surface disposed around the perimeter of the viewing field. The retro-reflective surface reflects radiation received from its originating source back toward this source. A radiation receiver is arranged adjacent to each source to receive the radiation reflected back from the retro-reflective surface and to determine the angular position of an object within the viewing field which interrupts the path of radiation.

REFERENCES:
patent: 3478220 (1969-11-01), Milroy
patent: 3764813 (1973-10-01), Clement et al.
patent: 3775560 (1973-11-01), Ebeling et al.
patent: 3860754 (1975-01-01), Johnson et al.
patent: 4107522 (1978-08-01), Walter
patent: 4144449 (1979-03-01), Funk et al.

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