Photoelectric encoder

Details Photoelectric encoder Photoelectric encoder

2011-08-09

2011-08-09

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231180, C250S231140, C250S231160, C341S110000, C341S011000

Reexamination Certificate

active

07994470

ABSTRACT:
The present invention relates to a photoelectric encoder including a scale having a grating (incremental pattern) of a predetermined pitch formed thereon and a light source (light-emitting element) and a light-receiving unit, which are relatively displaceable with respect to the scale, wherein light-receiving elements of the light-receiving unit output bright and dark signals of “N” phases, and the phases are detected by fitting a sinusoidal wave function having a fixed period to the bright and dark signals of “N” phases, thereby reducing a position detection error resulting from stains on the scale and/or defects of the grating.

REFERENCES:
patent: 4524347 (1985-06-01), Rogers
patent: 4720699 (1988-01-01), Smith
patent: 5021650 (1991-06-01), Rieder et al.
patent: 5889280 (1999-03-01), Matsuura
patent: A-64-57120 (1989-03-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2708184