Movable object position detecting method and apparatus

Details Movable object position detecting method and apparatus Movable object position detecting method and apparatus

1988-03-29

1989-06-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 356356, G01D 534

Patent

active

048432369

ABSTRACT:
A movable object position detecting method and apparatus perform detection of an absolute position of a code plate attached to the movable object, by using at least two position detection parts which include an upper-digit (namely, lower-order) position detection part and a lower-digit (namely, higher-order) position detection part, respectively. The upper-digit position detection part detects the absolute position of the code plate within a predetermined detection range to provide binary detection data. The lower-digit position detection part detects a position of the code plate within a detection range twice as large as a minimum detection width of the upper-digit position detection part to provide digitized detection data. By processing detection data on the basis of the coincidence or difference between respective overlapping digits of detection data of the upper-digit position detection part and detection data of the lower-digit position detection part, accurate position data of the code plate are determined.

REFERENCES:
patent: 3427463 (1969-02-01), Weyrauch
patent: 3713139 (1973-01-01), Sanford et al.
patent: 4265534 (1981-05-01), Remijan
patent: 4326128 (1982-04-01), Klein
patent: 4395124 (1983-07-01), Remijan
patent: 4542989 (1985-09-01), Remijan
patent: 4678908 (1987-07-01), La Plante

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