Radiation suppressed keyboard

Details Radiation suppressed keyboard Radiation suppressed keyboard

1975-11-19

1977-07-12

Caldwell, John W.

Communications: electrical

Audible indication

Percussion-type sound producer

336 84, 340365R, 361400, G08C 2500

Patent

active

040357945

ABSTRACT:
A keyboard for use with a data processing display terminal utilizing a cathode ray tube (CRT) display is provided from which information bearing electromagnetic radiations are suppressed using solid state keyboard switches having no contact bounce and generating low level signals with few transients, metallic oxide silicon (MOS) semiconductor circuitry having relatively low switching speeds to generate few transients, careful packaging of components to minimize printed circuit path and wiring lengths, ferrite beads on component leads to suppress transient generation, and shielding of printed circuit paths by sandwiching them between ground planes.

REFERENCES:
patent: 2690536 (1954-09-01), Adams
patent: 2826748 (1958-03-01), Newton
patent: 3202879 (1965-08-01), Sterling
patent: 3624645 (1971-11-01), Gluck et al.
patent: 3701958 (1972-10-01), Jaag
Marston, "Using Cosmos Digital IC's", Radio-Electronics, Nov. 1974, p. 54.
Runyon, "Focus on Keyboards", Electronic Design 23, Nov. 1972, pp. 54-64.

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