Absolute position detector with diffraction grating windows and

Details Absolute position detector with diffraction grating windows and Absolute position detector with diffraction grating windows and

1993-02-25

1993-11-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

052605680

ABSTRACT:
An optical absolute position encoder capable of obtaining absolute position data in a wide range utilizes the fact that the position of a transmitted or reflected light beam is shifted in accordance with the displacement of a grating window and the fact that the grating window can be specified depending upon the characteristics of the light beam which has passed through the grating window. Furthermore, precise position data is obtained by using two gratings which move relatively. The above-described data are combined with each other so that absolute position data revealing high resolution can accurately be obtained for a long stroke.

REFERENCES:
patent: 4950891 (1990-08-01), Matsui
patent: 4979827 (1990-12-01), Matsui

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