Code plate of optical rotary encoder having tilted light-detecti

Details Code plate of optical rotary encoder having tilted light-detecti Code plate of optical rotary encoder having tilted light-detecti

1997-03-03

1999-09-07

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, 341 13, G01D 534

Patent

active

059490675

ABSTRACT:
An optical rotary encoder including a rotary substrate and an A, B phase detection pattern formed in the rotary substrate and having light-transmitting holes and light-transmitting grooves. The light-transmitting holes and grooves are apertures used to detect the angle of rotation, direction of rotation, and rotational speed of a drive shaft, and are formed with a constant width w and at a constant pitch p in the outermost periphery of the rotary substrate. The light-transmitting hole, being a slot, is formed slightly inward from the outer peripheral edge of the rotary substrate and tilted in a constant direction and at a constant angle such that an axial line in the longitudinal direction thereof is tilted with respect to a straight line connecting the center of rotation of the rotary substrate and the center between the light-transmitting holes. On the other hand, the light-transmitting groove, being a long groove, is cut out between adjacent light-transmitting holes so as to extend inward from the outer peripheral edge of the rotary substrate. A photointerrupter is set a location offset from a vertical line. Accordingly, the optical rotary encoder is capable of detecting rotation with high resolution and accuracy, wherein the photointerrupter can be mounted with greater freedom and at a lower cost.

REFERENCES:
patent: 4224514 (1980-09-01), Weber
patent: 4827123 (1989-05-01), Gray
patent: 4965446 (1990-10-01), Vyse
patent: 5017776 (1991-05-01), Loewen

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