Optical rotary encoder

Details Optical rotary encoder Optical rotary encoder

1984-02-21

1987-01-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

G01D 534

Patent

active

046395954

ABSTRACT:
An improved rotary encoder where trackability and durability is an improved and a wider installation field is no longer necessary. Particularly, a rotary encoder and a rotary driver are separated. In the rotary encoder, a rotor is provided and its circumference is provided with a reflection surface and other surface resulting in reflectivity difference. Concave and convex parts are formed at the circumference of rotor and the upper surface of convex part providing the reflecting surface. A light emitting part and the light receiving part are arranged closely so that their end surfaces placed in contact through a flat contact surface, and thereby a sufficient output voltage can be obtained as compared with the other end surface structure. Moreover, the light emitting part and light receiving part are arranged adjacent circumference of the, and rotor, and adequate space is formed between the rotor and holding means for assuring free rotation under the no contact condition.

REFERENCES:
patent: 3942112 (1976-03-01), Westbrook
patent: 4093853 (1978-06-01), Hunt
patent: 4162399 (1979-07-01), Hudson
patent: 4289962 (1981-09-01), Palloch et al.
patent: 4317032 (1982-02-01), Hanus et al.
patent: 4327362 (1982-04-01), Hoss
patent: 4387299 (1983-06-01), Akiyama
patent: 4500870 (1985-02-01), Krohn et al.
patent: 4512184 (1985-04-01), Ernst et al.

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