Environmentally safe touch typing keyboard

Details Environmentally safe touch typing keyboard Environmentally safe touch typing keyboard

1993-12-15

1995-01-03

Wiecking, David A.

Typewriting machines

Key-board or key lever-actuating mechanism

Including means generating a signal for type selecting or...

345175, B41J 510

Patent

active

053780698

ABSTRACT:
A keyboard that has two adjacent rows of emitters opposed by two adjacent rows of detectors that is environmentally sealed and has no moving parts. This said keyboard has a field changeable coded indicia 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 said scan patterns can include scanning the finger position by multiple emitter detector pairs at angles other than ninety degrees to give a cross check on 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. Also another said scan pattern can include, that both emitter detector pairs before and after the detected finger position must show a no finger detection condition to be a valid finger detection. This said keyboard can also use one value of feedback gain to check ambient light and a different value to detect a finger by the same detectors scanning the keyboard.

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IBM Technical Disclosure Bulletin, vol. 20 No. 4 Sep. 1977 S75180086M.

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