Optical encoder and scale for encoder

Details Optical encoder and scale for encoder Optical encoder and scale for encoder

2005-07-05

2005-07-05

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231130

Reexamination Certificate

active

06914234

ABSTRACT:
Laser light output from a laser light source is irradiated onto a transmission-type scale. Due to movement of the transmission-type scale, a polarization angle of transmitted light varies in accordance with variations in orientations of half-wave plates arrayed in a longitudinal direction. It is difficult for the polarization angle to be affected by noise factors such as external light or the like. Light intensity of a polarized light component, which is transmitted through an analyzer and detected at a photo-detector, varies in accordance with the polarization angle. Thus, the light intensity varies as the transmission-type scale moves, and a detection signal is output to a movement amount computing device. When an amount of movement is computed on the basis of the signal, the exact amount of movement can be detected.

REFERENCES:
patent: 6512733 (2003-01-01), Kawano et al.
patent: A 62-200224 (1987-09-01), None
patent: A 7-306058 (1995-11-01), None
patent: A 10-190148 (1998-07-01), None
patent: 2000-82213 (2000-03-01), None
Viswanathan et al., “A Detailed Investigation of the Polarization-Dependent Surface-Relief-Grating Formation Process on Azo Polymer Films”, Jpn. J. Appl. Phys., vol. 38, No. 10, pp. 5928-5937, 1999.
Ueki et al., “Single-Transverse-Mode 3.4-mW Emission of Oxide-Confided 780-nm VCSEL's”, IEEE Photonics Technology Letters, vol. 11, No. 12, 1999.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3377058