Absolute and directional encoder using optical disk

Details Absolute and directional encoder using optical disk Absolute and directional encoder using optical disk

1994-09-09

1997-02-11

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 2502015, 369 4426, G01D 534

Patent

active

056023880

ABSTRACT:
A super high resolution rotary optical encoder having as its disk an optical disk, i.e., a disk employing the optical principle of non-contact readout based on diffraction theory. The encoder is adapted to be coupled to a device of which it is desired to measure the rotational motion thereof. The encoder includes an optical disk having, at a fixed radial distance, at least one track of pits and lands; a coupler for coupling the optical disk to the device such that rotary motion of the device results in a corresponding rotary motion of the optical disk; and an optical disk pick-up for generating an output in response to the pits and lands indicative of the rotary motion of the device.

REFERENCES:
patent: 3862428 (1975-01-01), Waters
patent: 5006703 (1991-04-01), Shikunami et al.
patent: 5068529 (1991-11-01), Ohno et al.
patent: 5107107 (1992-04-01), Osborne
patent: 5179482 (1993-01-01), Tanaka et al.
patent: 5227930 (1993-07-01), Thanos et al.
patent: 5245597 (1993-09-01), Lee et al.
Optical Encoders, Dynamics Research Corporation, Jul., 1991.

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