Double-beam light source apparatus, position detecting apparatus

Details Double-beam light source apparatus, position detecting apparatus Double-beam light source apparatus, position detecting apparatus

1995-06-06

1996-10-29

Sikes, William L.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250557, 356400, 356401, G01N 2186, G06K 7015, G01B 1100

Patent

active

055699294

ABSTRACT:
A position detecting apparatus comprises a double-beam producing device for producing two beams different in frequency from each other, which are guided to irradiate a diffraction grating on an object to be inspected in two predetermined directions, and a detector photoelectrically detecting through an objective optical system diffracted light produced by the diffraction grating, in which the double-beam producing device comprises a light source for supplying a beam of a single wavelength or multiple wavelengths, a beam splitting device for splitting the beam from the light source into two predetermined beams, a relay optical system for converging the two split beams at a predetermined position, and a frequency difference producing device disposed at or near a converging position by the relay optical system, for producing a predetermined frequency difference between the two split beams.

REFERENCES:
patent: 4110016 (1978-08-01), Berg et al.
patent: 4281904 (1981-08-01), Sprague et al.
patent: 4918699 (1990-04-01), Boyd et al.
patent: 5070250 (1991-12-01), Komatsu et al.
patent: 5369489 (1994-11-01), Somekh
patent: 5394240 (1995-02-01), Matsumoto

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