Optical encoder with contamination detection

Details Optical encoder with contamination detection Optical encoder with contamination detection

2005-11-28

2010-12-07

Le, Thien M. (Department: 2887)

Registers

Coded record sensors

Particular sensor structure

C250S201100, C250S205000, C250S559410

Reexamination Certificate

active

07845556

ABSTRACT:
An optical unit includes an optical emitter receiving an optical emitter current, an optical sensor receiving an optical sensor current and light from the optical emitter and in response thereto outputting at least one signal indicating relative movement between the optical unit and an optical code scale, and an optical sensor current detector comparing the optical sensor current to a reference value. In response to the optical sensor current being different than the reference value, the optical sensor current detector outputs an optical sensor current detector signal. The optical sensor current detector signal indicates the presence of a contaminant in a light path from the optical emitter to the optical sensor, and is used to regulate the current to the optical emitter so as to counteract the negative effects of the contaminant in the light path.

REFERENCES:
patent: 4093961 (1978-06-01), Kanamaru
patent: 4334301 (1982-06-01), Kanamaru
patent: 4712000 (1987-12-01), Yoshikawa et al.
patent: 4713964 (1987-12-01), Ioannides
patent: 4996786 (1991-03-01), Shoenfeld
patent: 5015836 (1991-05-01), Van Antwerp
patent: 5132527 (1992-07-01), Karpati
patent: 5302944 (1994-04-01), Curtis
patent: 5406267 (1995-04-01), Curtis
patent: 5446272 (1995-08-01), Barkan
patent: 5693931 (1997-12-01), Wade
patent: 5694208 (1997-12-01), Ichikawa
patent: 6107620 (2000-08-01), Shiba et al.
patent: 6119938 (2000-09-01), Agabra et al.
patent: 6653620 (2003-11-01), Blasing et al.
patent: 6734948 (2004-05-01), Futakami et al.
patent: 7291831 (2007-11-01), Rajaiah et al.
patent: 2005/0127305 (2005-06-01), Androsyuk et al.
patent: 2005/0199777 (2005-09-01), Rajaiah et al.
patent: 2006/0192008 (2006-08-01), Wong et al.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4159259