Talbot's interference type optical encoder

Details Talbot's interference type optical encoder Talbot's interference type optical encoder

1993-06-28

1994-10-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, H01J 4014

Patent

active

053591933

ABSTRACT:
Disclosed is a Talbot's interference type optical encoder constructed so as to minimize a measurement error due to a signal distortion. A semiconductor laser is installed so that a vertical transverse mode is set in a direction vertical to a moving direction of a diffraction grating serving as a scale. Further, a stop for regulating light beams from a light source is prepared. An aperture of this stop assumes such a configuration that a dimension in a direction along the moving direction of the scale diffraction grating is set equal to or shorter than a dimension in a direction vertical to the moving direction of the scale diffraction grating. Distortions of signals obtained are thereby reduced. A comparison level in signal processing can be centered on an amplitude of the signal, and, as a result, an occurrence of error can be prevented.

REFERENCES:
patent: 4850693 (1989-07-01), Deason et al.
patent: 4988864 (1991-01-01), Michel et al.
patent: 5170221 (1992-12-01), Matsui et al.
patent: 5198873 (1993-03-01), Ishizuka et al.
K. Hane, Y. Uchida, S. Hattori, "Moire Displacement Measurement Technique for a Linear Encoder", Optics and Laser Technology, Apr. 1985, pp. 89-95.

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