Wristwatch calculator with selectively scanned keyboard

Details Wristwatch calculator with selectively scanned keyboard Wristwatch calculator with selectively scanned keyboard

1976-08-30

1978-08-22

Smith, Jerry

Boots, shoes, and leggings

58 50R, 58152R, 364707, 364709, G06F 738, G06F 1502, G04B 1930

Patent

active

041093151

ABSTRACT:
A wristwatch calculator is provided with a keyboard for the entry of information into and control of operations of the apparatus. The keyboard comprises an array of switches connected in an X-Y matrix that is scanned by row and column to find and identify a key that has been depressed. The scanner is operated only when calculator circuitry in the apparatus is in a sleep or inactive mode in order to save battery power.

REFERENCES:
patent: 3941989 (1976-03-01), McLaughlin et al.
patent: 3955355 (1976-05-01), Luce

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