Optical encoder with dual diffraction grating

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

25023114, 356356, H01J 314

Patent

active

056963734

ABSTRACT:
An optical encoder including a light source and a first grating plate having a first diffraction grating for diffracting a light beam emitted from the light source. The optical encoder further includes a second grating plate having a second diffraction grating including a blazed diffraction grating for further diffracting the light beam diffracted by the first diffraction grating so as to allow the light beam to be incident on the first grating plate. The optical encoder also includes a light-receiving portion for receiving the light beam reentering the first grating plate and diffracted by the first grating plate. The second diffraction grating is designed so that the greater part of the diffracted light is concentrated in diffracted light beam of a predetermined order among the light beams from the first diffraction grating, and the diffracted light beam of the predetermined order travels from the second diffraction grating in a direction which is parallel with a direction in which the light beam is incident on the second diffraction grating from the first grating plate. The light-receiving portion generates an electric signal in accordance with an amount of plus and minus mth-order diffracted light beams of the further diffracted light beam.

REFERENCES:
patent: 4338012 (1982-07-01), Matsumura et al.
patent: 5196711 (1993-03-01), Matsugu et al.
patent: 5283434 (1994-02-01), Ishizuka et al.
patent: 5483377 (1996-01-01), Kaneda 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

Optical encoder with dual diffraction grating does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical encoder with dual diffraction grating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical encoder with dual diffraction grating will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1609892

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