Optical encoders using transmitted and reflected light detection

Details Optical encoders using transmitted and reflected light detection Optical encoders using transmitted and reflected light detection

1990-09-19

1991-11-12

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

050650130

ABSTRACT:
An optical encoder has an optically-encoded plate having parallel tracks each comprising alternate opaque, reflective regions and transparent, non-reflective regions which differ in length between the tracks. LED's direct radiation onto one side of each track. Detectors located on one side of the plate provide an output in response to radiation reflected from the reflective regions of each track; detectors located on the opposite side of the plate provide an output in response to radiation transmitted through the transparent regions. The outputs from the detectors are normally complementary. A processor detects any loss of complementarity and determines the position of the plate close to the boundary between adjacent regions by comparing the detector outputs as one falls and the other rises.

REFERENCES:
patent: 4135086 (1979-01-01), Baba
patent: 4560280 (1985-12-01), Iwamoto et al.
patent: 4633224 (1986-12-01), Gipp et al.
patent: 4672201 (1987-06-01), Welker
patent: 4684257 (1987-08-01), Hanaoka et al.
patent: 4823000 (1989-04-01), Onyon

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1014419