Optical encoder which use a rectangular photodetector array

Details Optical encoder which use a rectangular photodetector array Optical encoder which use a rectangular photodetector array

1985-06-04

1987-04-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 340347P, H03M 100

Patent

active

046616969

ABSTRACT:
An improved optical encoder is disclosed. The encoder includes a moveable scale with alternating equally dimensioned opaque and translucent regions extending generally perpendicular to the locus of scale movement; and a light source, a mask and a rectangular photodetector array having at least a pair of generally symmetrical, rectangular photodetector areas, the longitudinal dimensions of those areas being disposed relative to the regions of the scale at a predetermined acute angle of rotation. The mask defines at least two series of equally spaced apart elongated phase shifted openings aligned to be generally parallel with the regions of the scale, the mask openings being aligned at the same angle of rotation as the major lineal dimensions of the photodetector areas. The mask openings are substantially coextensive with the rectangular photodetector areas. The light source, mask and photodetector array are commonly mounted on a single axis of rotation in a rotatable stationary housing. Rotation of the housing provides a smooth bilateral electrical phase trim; and, the improved encoder uses a rectangular photodetector array of the minimum effective size.

REFERENCES:
patent: 4184071 (1985-01-01), Fryer et al.
patent: 4593194 (1986-06-01), Graham et al.

Affiliated with

Also associated with

Rating

Optical encoder which use a rectangular photodetector array 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 which use a rectangular photodetector array, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical encoder which use a rectangular photodetector array will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-478791