Optical encoder with amplitude correction

Details Optical encoder with amplitude correction Optical encoder with amplitude correction

2008-04-30

2010-06-08

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231160, C356S617000

Reexamination Certificate

active

07732754

ABSTRACT:
According to one embodiment, there is provided an optical encoder having a photodetector array comprising motion detection photodetectors and at least one reference photodetector vertically offset from the motion detection photodetectors. The output signal generated by the at least one reference photodetectors is employed to correct undesired variations in the amplitudes of the output signals generated by the motion detection photodetectors. Such variations typically arise from various mechanical and optical misalignments in the optical encoder, and are compensated for by using the reference output signal to add to or subtract from, as required, the amplitudes of motion detection output signals.

REFERENCES:
patent: 4223261 (1980-09-01), White
patent: 4998013 (1991-03-01), Epstein et al.
patent: 5260568 (1993-11-01), Ieki
patent: 5629550 (1997-05-01), Mita et al.
patent: 6154278 (2000-11-01), Ito et al.
patent: 6229140 (2001-05-01), Ishizuka
patent: 6345074 (2002-02-01), Turk et al.
patent: 6563108 (2003-05-01), Stevens et al.
patent: 6598196 (2003-07-01), Bussard et al.
patent: 6885457 (2005-04-01), Michel et al.
patent: 7244928 (2007-07-01), Ng et al.
patent: 7348544 (2008-03-01), Atsula et al.
patent: 2004/0172208 (2004-09-01), Freitag et al.
patent: 2007/0138382 (2007-06-01), Matsuyama
Quick Assembly Two and Three Channel Optical Encoders—Technical Data HEDM-550x/560x, HEDS-550x/554x, and HEDS-560x/564x, Agilent Technologies. Date unknown.
Specification, ASI IC. Optolab Microsystems. Date unknown.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4244433