Optical rotary encoder having at least one zone plate

Details Optical rotary encoder having at least one zone plate Optical rotary encoder having at least one zone plate

1998-03-27

2000-02-01

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237R, G01D 534

Patent

active

060205857

ABSTRACT:
In an optical rotary encoder, a stationary plate having a zone plate and a rotary slit plate having slits are interposed between a light source and a light receiving element. A suitable radius of the innermost circle of the zone plate is selected so that the zone platess provide a sufficient convergence of light for reduction of silt interval (hence for improvement of the detection precision) with a distance between the stationary plate and the rotary slit plate maintained at a value permitting the fabrication of the encoder.

REFERENCES:
patent: 4700065 (1987-10-01), Kordulla et al.
patent: 5054913 (1991-10-01), Ishikawa et al.
patent: 5251012 (1993-10-01), Riegger et al.
Miyama, H. et al., "Optical Micro Encoder Using a Vertical-Cavity Surface-Emitting Laser", Sensors and Actuators A, vol. A57, No. 2, pp. 127-137, Nov. 1996.

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