Touch entry using discrete reflectors

Details Touch entry using discrete reflectors Touch entry using discrete reflectors

1988-12-19

1991-01-22

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With light attenuation

250221, G01B 1103

Patent

active

049866621

ABSTRACT:
A system and apparatus utilizes a source of coherent light located at the focal point of reflecting surfaces oriented to develop parallel beams of light extending over a given area with adjacent sides made to include arrays of light detectors scanned sequentially in a direction away from the source of light so as to detect the shadow cast by an object relative to the reflected light. Alternatively, a photodetector is positioned at the focal point of the reflectors to receive light emitted by individual ones of emitters. Reflecting surfaces are contemplated which simulate a parabolic shape.

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patent: 4735477 (1988-04-01), Bowen
Publication entitled Laser Touch Entry Device, by Buhler and Loucks.

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