Encoder and scanning system using a scale having a non-uniform p

Details Encoder and scanning system using a scale having a non-uniform p Encoder and scanning system using a scale having a non-uniform p

1991-01-16

1992-10-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250230, 250237G, G01D 534

Patent

active

051591928

ABSTRACT:
A rotary encoder and a scanning system using the same for detecting rotation of a galvano scanner which comprises a rotary scale coupled to a rotating driver, a scale with slits formed at a non-uniform pitch circumferentially on the rotary scale within a limited rotation angle and detection means for detecting a rotation status by reading the slits.

REFERENCES:
patent: 4263506 (1981-04-01), Epstein
patent: 4714830 (1987-12-01), Usui
patent: 4810064 (1989-03-01), Azusawa et al.
patent: 4829342 (1989-05-01), Nishimura
patent: 4868385 (1989-09-01), Nishimura
patent: 4874941 (1989-10-01), Spillman, Jr.
patent: 4928008 (1990-05-01), Huggins et al.

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