System for detecting an absolute position

Details System for detecting an absolute position System for detecting an absolute position

1982-12-17

1986-02-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340347P, G01D 534

Patent

active

045729514

ABSTRACT:
A plurality of detectors, i.e., encoders, are prepared each of which generates an output signal representing an absolute value below one period at a predetermined period with respect to a given rotational or linear displacement. A displacement associated with a rotational or linear displacement of an object of detection is provided to each detector and one period of each detector is established in such a manner that one such period corresponds to one of mutually different predetermined amounts of displacement of the object. As a result, the output signal of each detector changes at a rate which is different from one another with respect to the displacement of the object and a combination of values of the output signals of the respective detectors is sufficient to identify an absolute position of the object. Accordingly, the number of periods from an origin with respect to a predetermined detector is determined employing the present output signals of the respective detectors as a parameter and the absolute position is specified by a combination of an integer section of this number of periods and a value below one period represented by the output signal of this predetermined detector.

REFERENCES:
patent: 3419727 (1968-12-01), Pabst
patent: 4041483 (1977-08-01), Groff
patent: 4183014 (1980-01-01), McClean et al.
patent: 4384275 (1983-05-01), Masel et al.

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