Encoder using a birefringent element and a system including the

Details Encoder using a birefringent element and a system including the Encoder using a birefringent element and a system including the

1992-06-24

1994-04-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023116, G01D 534, H01J 314

Patent

active

053028210

ABSTRACT:
An encoder includes a light illuminating device, an optical scale and a photosensor, and detects information of relative displacement between the scale and the illuminating light. A birefringent element, such as a Savart plate or the like, is disposed in the optical path between the light illuminating device and the photosensor to generate a plurality of images of the scale having different phases. A plurality of output signals having a phase difference are obtained using the images of the scale.

REFERENCES:
patent: 3584959 (1971-06-01), Del Carlo
patent: 4034403 (1977-07-01), Compaan et al.
patent: 4930895 (1990-06-01), Nishimura et al.
patent: 4933673 (1990-06-01), Ishizuka et al.
patent: 4975570 (1990-12-01), Nishimura et al.
patent: 4979826 (1990-12-01), Ishisuka et al.
patent: 5026985 (1991-06-01), Ishizuka et al.

Affiliated with

Also associated with

Rating

Encoder using a birefringent element and a system including the does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Encoder using a birefringent element and a system including the , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Encoder using a birefringent element and a system including the will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2100507