Absolute encoder

Details Absolute encoder Absolute encoder

1989-09-01

1991-04-30

Reinhart, Mark J.

Coded data generation or conversion

Digital pattern reading type converter

Magnetic, inductive or capacitive

341 11, 341 16, 341 17, 341116, 341149, 341150, 341171, 341172, H03M 122

Patent

active

050122380

ABSTRACT:
An absolute encoder for detecting the absolute (as opposed to the relative) rotational displacement of an encoder shaft includes a pair of pitch signals recorded on tracks and an associated signal processing circuit. The pair of pitch signals have different periods (wave lengths) which are such that they have no common factors. The signal processing circuit includes magnetic sensors for producing absolute position data indicative of the degree of displacement of the encoder shaft, on the basis of the pitch signals. Through the use of a pair of pitch signals having periods with no common factor, a high degree of resolution is obtained, without having no significantly increase the number of pitch signal tracks.

REFERENCES:
patent: 4782329 (1988-11-01), Iijima et al.

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