Encoding device for multiple consecutive position detection

Details Encoding device for multiple consecutive position detection Encoding device for multiple consecutive position detection

1989-01-10

1990-05-01

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6185, G08B 2100, H01H 906

Patent

active

049222350

ABSTRACT:
A device for marking, for example, the position of a control knob, comprising an arrangement with several terminals each of which corresponds to one of the positions, the application of a DC voltage (+V) at each instant to one and only one of the terminals indicating the presence of the knob in the corresponding position. The device includes a series of operational amplifiers having specified gain, each amplifier having its inverting input connected to one of the terminals and its non-inverting input connected to the terminal corresponding to the next position. Each terminal is connected to a circuit for taking those terminals, which do not correspond to the momentary position of the knob, to a specified voltage. The outputs of the amplifiers are connected to a detection circuit for detecting on one of them any transition whose amplitude exceeds a specified threshold and to control a count-up/count-down device whose output value is incremented or decremented depending on the direction of the transition, this output value constituting an indication of the position of the knob.

REFERENCES:
patent: 2902685 (1959-09-01), Davis
patent: 3050718 (1962-08-01), Giel
patent: 3465331 (1969-09-01), Trotscher
patent: 4459115 (1984-07-01), Ballard
patent: 4493155 (1985-01-01), Comeau et al.
patent: 4567763 (1986-02-01), Schiffbauer
patent: 4719445 (1988-01-01), Fremd
patent: 4728923 (1988-03-01), Finger
Electronique Industrielle, No. 136, Sep. 1970, pp. 511-516.

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