Acousto-optic modulator, position detector using it, and project

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

356400, G01N 2186

Patent

active

058013890

ABSTRACT:
In a position detecting apparatus, a light beam from a white light source is guided through a collimator lens etc. to be converted into a parallel beam, and this parallel beam is incident to a first acousto-optic modulator (AOM) and a second acousto-optic modulator positioned with a spacing by which a phase difference between diffracted light is approximately m.sup..pi. (where m is an integer). Traveling waves of slightly different frequencies opposite to each other are supplied in opposite directions to the two acousto-optic modulators, and the position detecting apparatus executes position detection by the heterodyne interference method as guiding a beam comprised of +first-order diffracted light from the acousto-optic modulators and a beam comprised of -first-order diffracted light from the acousto-optic modulators through an objective lens to project them with a predetermined intersecting angle onto a diffraction grating mark.

REFERENCES:
patent: 5070250 (1991-12-01), Komatsu et al.
patent: 5329354 (1994-07-01), Yamamoto et al.
patent: 5347356 (1994-09-01), Ota et al.
patent: 5488230 (1996-01-01), Mizutani et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Acousto-optic modulator, position detector using it, and project does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Acousto-optic modulator, position detector using it, and project, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acousto-optic modulator, position detector using it, and project will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-272011

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.