Keyboard contact and signal line arrangement

Details Keyboard contact and signal line arrangement Keyboard contact and signal line arrangement

1975-05-01

1978-02-14

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340166R, G06F 302

Patent

active

040742610

ABSTRACT:
The invention relates to a keyboard comprising at least three contact points per key. One of a group of signal connections is always alternately connected to a group of keys. Each key is then alternately connected to one signal connection of said group. At least three of such groups are present so as to obtain a comparatively low value for the ratio of the number of signal connections to the number of keys.

REFERENCES:
patent: 3886335 (1975-05-01), Hendricks
patent: 3950743 (1976-04-01), Hatano et al.
"Memory Plane . . .", Constantine, IBM Technical Disclosure Bulletin, Jun. 1960, p. 45.
"Memory Core . . .", Leightner et al., IBM Technical Disclosure Bulletin, Dec. 1962, p. 61.
"Crossover Balanced . . .", Councill et al., IBM Technical Disclosure Bulletin, Sep. 1963, p. 55.

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