Absolute encoder

Details Absolute encoder Absolute encoder

1993-01-22

1995-07-04

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420725, 341 15, G01B 730

Patent

active

054303737

ABSTRACT:
An absolute encoder wherein tracks are arranged side-by-side on a magnetic drum in the axial direction thereof, and absolute patterns of circulatory random sequence codes are divided and recorded on the tracks, respectively. An additional track for generating sinewaves of two phases in synchronism with the reading of the absolute patterns is provided on the magnetic drum, so that an output can be obained by combining a coarse value of an absolute position obtained from the tracks and a fine value of an absolute position obtained from the additional track. The absolute patterns are detected from the two tracks recorded on the magnetic drum by magnetic resistive elements connected with each other to form circuits each having a three-terminal. Terminals of the magnetic resistive elements are connected through a common line with an electric power source in order to prevent the lines from being crossed.

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patent: 5172057 (1992-12-01), Yoshimura et al.
patent: 5243280 (1993-09-01), Kusumi
patent: 5289122 (1994-02-01), Shigeno
"Absolute-Type Position Transducers Using a Pseudorandom Encoding"; IEEE Transactions on Instrumentation and Measurement, vol. IM-36, No. 4, Dec. 1987.

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