Diffraction grating interference system encoder for...

Details Diffraction grating interference system encoder for... Diffraction grating interference system encoder for...

2005-10-25

2005-10-25

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G, C356S496000, C356S614000, C341S031000

Reexamination Certificate

active

06958469

ABSTRACT:
A displacement information detector in which a coherent luminous flux from a light source is applied to a diffraction grating scale adapted to be relatively moved to generate two diffracted rays of light having different orders, and the two diffracted rays of light are diffracted and deflected in a diffraction grating in which circular or toric curves are arranged in lattice at unequal pitches to be irradiated to the diffraction grating scale again to be rediffracted, and the diffracted rays of light are combined with each other to be made interfere each other, and the resultant interference light is introduced into a light receiving element to thereby detect a periodic signal due to the relative movement of the diffraction grating scale.

REFERENCES:
patent: 4792678 (1988-12-01), Spies
patent: 5666196 (1997-09-01), Ishii et al.
patent: 5880839 (1999-03-01), Ishizuka et al.
patent: 5981941 (1999-11-01), Takata et al.
patent: 6635863 (2003-10-01), Nihommori et al.
patent: 2001/0017350 (2001-08-01), Ishizuka
patent: 2-5127 (1990-01-01), None
European Search Report; Place of Search Munich; Date of Search Jul. 4, 2003.

Affiliated with

Also associated with

Rating

Diffraction grating interference system encoder for... does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3455362