Non-contact X Y digitizer using two dynamic ram imagers
Patent
·
OSTI ID:5486525
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 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.
- Assignee:
- Siemens Corporate Research and Support Inc.
- Patent Number(s):
- US 4507557
- OSTI ID:
- 5486525
- Country of Publication:
- United States
- Language:
- English
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