Input detection based on speckle-modulated laser self-mixing

Details Input detection based on speckle-modulated laser self-mixing Input detection based on speckle-modulated laser self-mixing

2007-09-11

2007-09-11

Zimmerman, Brian (Department: 2612)

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

C379S368000, C345S168000

Reexamination Certificate

active

11154828

ABSTRACT:
A keyboard detects press or release of keys based on laser output which is changed by speckle-modulated self-mixing. Unique targets are attached to keys. As a target is moved into and/or out of the path of a laser, speckling causes light to shine back into the laser's emitting cavity. Variations in laser output are analyzed to identify the key moved and the direction of movement.

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