Keyswitch with hysteresis

Details Keyswitch with hysteresis Keyswitch with hysteresis

1976-04-06

1978-08-29

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

200DIG1, 307351, 307353, 328151, 340365R, 340365E, 340347SH, H01G 501, G08C 2500

Patent

active

041107489

ABSTRACT:
In a keyboard there are a plurality of key operated variable capacitor switches acting as differentiators to change the widths of electrical pulses which are then integrated to give signals whose level indicate which switches have been operated. The gain and operating points of amplifiers can be changed to change the transfer function of the electronics and thus increase the mechanical hysteresis of the switches.

REFERENCES:
patent: 3631472 (1971-12-01), Lincoln
patent: 3631473 (1971-12-01), Yakata et al.
patent: 3691555 (1972-09-01), Looschen
patent: 3717818 (1973-02-01), Herbst
patent: 3750113 (1973-07-01), Cencel
patent: 3815127 (1974-06-01), Blumke et al.
patent: 3912988 (1975-10-01), Levesque et al.
patent: 3918051 (1975-11-01), Bernin et al.
patent: 3943812 (1976-03-01), Nagai et al.
patent: 3982236 (1976-09-01), Kafafian
Williams, IBM Technical Disclosure Bulletin, "Touch-Sensing Circuit," Jun. 1974, pp. 166-167.

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