Optical encoder and method for producing same

Details Optical encoder and method for producing same Optical encoder and method for producing same

1984-09-25

1988-07-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340347P, 250237G, G01D 526

Patent

active

047571969

ABSTRACT:
An optical encoder and a method for producing the same in which each slit on a pulse scale of the encoder, which is an encoder wheel in the case of a rotary type encoder, is formed as a plurality of parallel grooves. The grooves are formed by depositing a thin layer of a reflective and chemically stable metal such as chromium or aluminum on a transparent plate and scanning the metal film with a laser while moving the plate and on/off modulating the laser to evaporate portions of the film. The laser is moved for each line of grooves, radially in the case of an encoder wheel.

REFERENCES:
patent: 2938378 (1960-05-01), Canada et al.
patent: 3985448 (1976-10-01), Wiklund et al.
patent: 3995156 (1976-11-01), Angersbach et al.
patent: 4371264 (1983-02-01), Lacombat et al.
patent: 4377028 (1983-03-01), Imahashi
patent: 4528448 (1985-07-01), Doggett
Data Recording on optical discs at 300 Mb/s by G. J. Ammon and C. W. Reno, RCA Engineer 27-3, pp. 36-43, 1982.

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