Optical position error detection using complementary steep angle

Details Optical position error detection using complementary steep angle Optical position error detection using complementary steep angle

1990-07-25

1992-03-31

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4424, 369 4414, 369 4441, G11B 700

Patent

active

051013932

ABSTRACT:
A method and apparatus for producing position error signals from a beam of light, called an input light beam, reflected from an optical surface of recording media, employs a detector prism which has a steep angle, reflection/transmission interface. A prism, such as a dove prism, separate from the detector prism, or other optical structure, integral with the detector prism, having one or more Brewster angle faces on which the input light beam is incident, is employed for inverting a portion of equal portions of the input light beam prior to incidence of the resulting beam on the reflection/transmission interface of the detector prism. Crossing of the marginal rays in the transmitted and reflected complementary light beams now does not invert the slope of the error signal. Now the error signal is not bilaterally sensitive in the respective complementary light beams. The signal instead is now generated by the difference in the total light energy in the respective transmitted and reflected complementary light beams.

REFERENCES:
patent: 3547526 (1967-10-01), Devereux
patent: 4422168 (1983-12-01), Ito et al.
patent: 4423495 (1983-12-01), Musha et al.
patent: 4425636 (1984-01-01), Musha et al.
patent: 4453239 (1984-06-01), Musha et al.
patent: 4455085 (1984-06-01), Kato et al.
patent: 4504938 (1985-03-01), Tajima
patent: 4505584 (1985-03-01), Kato et al.
patent: 4509830 (1985-04-01), Kato et al.
patent: 4525825 (1985-06-01), Ito et al.
patent: 4638471 (1987-01-01), van Rosmalen
patent: 4652737 (1987-03-01), Kowalski et al.
patent: 4773053 (1988-09-01), Gottfried
patent: 4779250 (1988-10-01), Kogure et al.
patent: 4797868 (1989-01-01), Ando
patent: 4862442 (1989-08-01), Tadakoro et al.
patent: 4873678 (1989-10-01), Nakamura et al.
Freese, Robert P., "Optical Disks Become Erasable", IEEE Spectrum, Feb. 1988, pp. 41-45.
Mansuripur, M., et al., "Signal And Noise In Magneto-Optical Readout", J. Appl. Phys. 53(6) (Jun. 1982).
Lee, Wai-Hon, "Optical Technology For Compact Disk Pickups", Lasers and Optronics, pp. 85-87 (Sep. 1987).

Affiliated with

Also associated with

Rating

Optical position error detection using complementary steep angle 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 position error detection using complementary steep angle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical position error detection using complementary steep angle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2264477