Keyboard

Details Keyboard Keyboard

2005-10-25

2005-10-25

Horabik, Michael (Department: 2635)

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

C341S026000, C324S423000, C200S0050EA, C200S00600C

Reexamination Certificate

active

06958711

ABSTRACT:
A keyboard includes a plurality of key elements arranged in rows and columns in a matrix-like manner. Each key element has first and second break contacts which are decoupled for safety reasons and are commonly activated when the key element is actuated. An energy supply unit feeds to an evaluation unit electric energy serially via the first break contacts for each separate column and serially via the second break contacts for each separate row. In this way the location of the key element actuation can be reliably ascertained through column and row detection.

REFERENCES:
patent: 3761945 (1973-09-01), Engle
patent: 4326194 (1982-04-01), Pepe
patent: 4532497 (1985-07-01), Danish
patent: 6417787 (2002-07-01), Hsu
patent: 6486674 (2002-11-01), Groenewold et al.
patent: 6828902 (2004-12-01), Casden
patent: 25 17 903 (1975-11-01), None
patent: 199 46 471 (2001-03-01), None

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