Optical encoder with photodetectors of width equal to and one-ha

Details Optical encoder with photodetectors of width equal to and one-ha Optical encoder with photodetectors of width equal to and one-ha

1991-04-17

1992-09-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023117, 250237G, G01D 534

Patent

active

051480204

ABSTRACT:
The invention provides an optical encoder for encoding the position of a rotatable shaft. The encoder generates an index pulse having the same logic level regardless of the direction of rotation of the shaft. The encoder includes a light source; a code wheel having plural alternating windows and spokes which respectively transmit or block light from the light source; and first, second, and third photodetectors in alignment with the light source. The code wheel is mounted between the light source and the photodetectors. The first photodetector has a unit width and is mounted between the second and third photodetectors which each have a one-half unit width. The index window has a three-unit width. The encoder also includes a buffer circuit having a first input connected to the output of the second and third photodetectors, and a second input connected to the output of the first photodetector.

REFERENCES:
patent: 4654525 (1987-03-01), Ebina et al.
patent: 4833316 (1989-05-01), Yoneda

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-738034