Optical encoder

Details Optical encoder Optical encoder

2005-09-06

2005-09-06

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

For dimensional measurement

C250S23700G

Reexamination Certificate

active

06940603

ABSTRACT:
A surface-emitting laser is disposed on a photodetector disposed in parallel with a scale, so that an optical pattern surface of the scale can be irradiated with a light beam having a desired shape. A major axis of the light beam emitted from the surface-emitting laser is vertical to the photodetector, and forms a beam spot on the optical pattern surface of the scale. A light emission portion of the light source is disposed in a 0-order diffracted light region from the scale and other than a region in which only a 0-order diffracted light and 1st-order diffracted light or a 0-order diffracted light and −1st-order diffracted light interfere. A light shield metal and/or a dummy light receiving portion are/is disposed to surround a light receiving portion outer periphery, and is disposed in a region between an inner periphery of the light receiving portion and the surface-emitting laser.

REFERENCES:
patent: 4395124 (1983-07-01), Remijan
patent: 4823001 (1989-04-01), Kobayashi et al.
patent: 5428445 (1995-06-01), Holzapfel
patent: 5991249 (1999-11-01), Lee
patent: 6800842 (2004-10-01), Ito
patent: 63-47616 (1988-02-01), None
patent: 4-357414 (1992-12-01), None
patent: 11-120724 (1999-04-01), None
patent: 2000-205819 (2000-07-01), None
patent: 2000-337816 (2000-12-01), None
patent: 2001-174291 (2001-06-01), None
patent: 2002-48602 (2002-02-01), None
patent: 2002-139353 (2002-05-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3438441