Optical device that measures distance between the device and...

Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device

Reexamination Certificate

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Details

C345S156000, C345S163000

Reexamination Certificate

active

10826799

ABSTRACT:
An optical device and methods thereof are described. The device includes a first light source adapted to emit light onto a surface, and a detector adapted to receive light reflected from the surface. The reflected light produces a speckle pattern. The distance between the optical device and the surface can be measured using a quantifiable attribute associated with the speckle pattern.

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patent: 0 024 167 (1980-08-01), None

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