Non-contact X,Y digitizer using two dynamic ram imagers
First Claim
1. Apparatus for detecting the position of an object within a viewing field, said apparatus comprising, in combination:
- (a) a first, substantially point source of radiation disposed at a first location on the perimeter of said viewing field and arranged to illuminate said viewing field with radiation;
(b) a retro-reflective surface disposed around said perimeter and arranged to reflect radiation received from an originating source back toward said originating source; and
(c) first means, disposed on said perimeter adjacent to said first source, for receiving the radiation reflected by said retro-reflective surface and for sensing a first direction at which radiation originating from said first source is interrupted by an object located within said viewing field.
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Accused Products
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.
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Citations
21 Claims
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1. Apparatus for detecting the position of an object within a viewing field, said apparatus comprising, in combination:
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(a) a first, substantially point source of radiation disposed at a first location on the perimeter of said viewing field and arranged to illuminate said viewing field with radiation; (b) a retro-reflective surface disposed around said perimeter and arranged to reflect radiation received from an originating source back toward said originating source; and (c) first means, disposed on said perimeter adjacent to said first source, for receiving the radiation reflected by said retro-reflective surface and for sensing a first direction at which radiation originating from said first source is interrupted by an object located within said viewing field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification