Positional information generating apparatus and code means there

Details Positional information generating apparatus and code means there Positional information generating apparatus and code means there

1989-03-23

1990-10-23

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

341 13, 375 37, 324533, G05B 1101

Patent

active

049655035

ABSTRACT:
A positional information generating apparatus comprises a code disposed on a main track on which M-sequence codes form a cyclic code of different code words, and sensors disposed for attaining relative movement with reference to a direction of the main track. The code word is detected from the main track by the sensors for generating positional information. A sensor array for the main track in which a greater number of sensors than the number of elements of a code word are disposed over a span corresponding to a length of one code word in such a way that at least one sensor is located on each code element to define a code word to be read. A relative position detector is provided for detecting a relative positional relationship between the sensor array for the main track and the main track. A sensor selecting circuit selects a sensor for each code element from the sensor array for the main track, which is in a position to detect the code element, based on the detection signal from the relative position detector, and allows transmission of the detection signal from said sensor. A main track includes a cyclic code of different code words disposed thereon, and a sub-track includes discrimination elements arranged cyclically along the main track.

REFERENCES:
patent: 4041381 (1977-08-01), Hwa
patent: 4604521 (1986-08-01), Takekoshi et al.
patent: 4628298 (1986-12-01), Hafle et al.
patent: 4633224 (1986-12-01), Gipp et al.
patent: 4642810 (1987-02-01), Picard
International Publication No. WO86/00478 (International Application No. PCT/US85/0118) which corresponds to Japanese Publication No. 61-502512 listed above.

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