Optical encoder having optical conductor at the outer circumfere

Details Optical encoder having optical conductor at the outer circumfere Optical encoder having optical conductor at the outer circumfere

1998-07-08

2000-10-03

Ham, Seungsook

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 360 7314, G01D 534

Patent

active

061276774

ABSTRACT:
Light emitted from a light emitting device is reflected by a first reflection curved face so that the travel direction of the light is almost perpendicularly diffused, the light is reflected by a reflection face circumferentially formed on an end face of a rotor in the direction parallel to an axial line, and after that, the light is supplied to a stator side along a cylindrical part on the outer periphery of the rotor. In a stator, light is condensed again in the axial direction by a reflection face and, after that, the light is reflected by a second reflection curved face and is received by a photo sensing device. In this instance, since the light passed through whole slits on the end face of the rotor and whole slits in the peripheral part of the stator is converged and then detected by an FG, the signal level upon detection is increased, the detection accuracy is improved at low cost.

REFERENCES:
patent: 4788422 (1988-11-01), Fujiwara
patent: 5569912 (1996-10-01), Turk et al.

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