Apparatus and method using an indexed-encoder to sense the absol

Details Apparatus and method using an indexed-encoder to sense the absol Apparatus and method using an indexed-encoder to sense the absol

1997-12-29

2000-03-28

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023117, 341 6, 377 17, G01D 534

Patent

active

06043483&

ABSTRACT:
An apparatus and method for detecting the absolute position of a movable member, by monitoring the incremental and directional of movement of an indexed-encoder, coupled to the movable member, and comprising a single index space and a plurality of non-index spaces. The index space of the indexed-encoder member has a characteristic different than a characteristic of all of the other non-index spaces. The apparatus is capable of distinguishing the index space from any of the non-index spaces based on the characteristics of the index space and non-index spaces, and thus detecting when the index space or any of the non-index spaces is at the predetermined location. Based on the detection of the index and non-index spaces, the apparatus determines the direction of movement of the indexed-encoder, and an incremental movement in which the indexed-encoder has moved relative to the predetermined index location, to determine the absolute position of the indexed-encoder and hence, of the movable member with respect to the predetermined index location.

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