Manual control device

Details Manual control device Manual control device

1984-07-18

1987-06-16

Rowland, James L.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, 340709, 340711, 340789, 340722, 200 56R, G06F 314, G05B 1101

Patent

active

046739190

ABSTRACT:
Improvements in a manual control device wherein an incremental touch key or a decremental touch key is depressed by hand so as to bring a manipulated value and a set value into agreement. The manual control device comprises a pressure sensor which converts a contact pressure of a hand into a voltage level which is proportional to the pressure, a level encoder which delivers a pulse at any one of a plurality of different frequencies to a counter in correspondence with the output of the pressure sensor, a D/A converter which converts a digital output of the counter into an analog output, and an output driver which controls a base current of a transistor for driving a manipulated-value indicator, by the A.C. output of the D/A converter.

REFERENCES:
patent: 4313113 (1982-01-01), Thornburg
patent: 4367436 (1983-01-01), Arnichand et al.
Harrod, R. D., Touch-Pressure Sensitive Frequency-Modulated Keyboard, in IBM Technical Disclosure Bulletin, vol. 20, No. 10 (Mar. 1978), 4039-4040.

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