Light controlled touch pad for cursor and selection control on a

Details Light controlled touch pad for cursor and selection control on a Light controlled touch pad for cursor and selection control on a

1994-09-23

1996-11-26

Burr, Edgar S.

Typewriting machines

Key-board or key lever-actuating mechanism

341 22, 345157, 345173, B41J 500, G09G 500

Patent

active

055778488

ABSTRACT:
A keyboard where no finger pressure is needed to input data, that uses rows of emitters opposed by rows of detectors to detect a finger position, that is environmentally sealed, and inherently intrinsic safe. The keyboard has a mouse function so an operators finger can be tracked to position a cursor on a host display, and input normal keyboard functions. The keyboard has a field changeable coded overlay with indicia thereon so a scan pattern, ambient reference level or other application specific variables can be changed without breaking the environmental seal or powering down the keyboard. Further, the different scan patterns can include scanning the finger position by multiple emitter detector pairs at angles other than ninety degrees to give a cross check of detection. These said scan patterns can be further optimized to scan angled sets of keys and to adjust to different ambient light conditions so errors can be detected by the emitter detector pair closest to detection of a finger. Further to have a scanning technique so less emitters can be used than detectors. The scanning pattern can also include detecting the speed of the finger and relating that speed to the accuracy of the cursor, and emitting a frequency to be decoded by the detector to eliminate cross talk and ambient light interference.

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