Rotary encoder having a plurality of patterns with different cyc

Details Rotary encoder having a plurality of patterns with different cyc Rotary encoder having a plurality of patterns with different cyc

1996-09-23

1998-07-28

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 250237, 341 13, G01D 534

Patent

active

057865930

ABSTRACT:
The present invention relates to a rotary encoder for detecting an angle and more particularly to a rotary encoder having a scale with a plurality of patterns of different cycles formed on the rotor thereof and capable of precisely measuring the angle of the rotor by reading the scale. The rotary encoder is made up of a rotor and a stator. A scale formed on the rotor has a first pattern modulated for a first period and a second pattern modulated for a second period different from the first period and the first pattern and the second pattern are sequentially disposed at equal pitch in the rotating direction of the rotor, and, further, there is provided a scale detection means for reading the patterns of the scale. Modulation of the first pattern and the second pattern may be made by spatial modulation exercised by changing the width of the bars in the scale.

REFERENCES:
patent: 4623790 (1986-11-01), Stossel

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