Optimal polarization for the optical readout of high density vid

Details Optimal polarization for the optical readout of high density vid Optimal polarization for the optical readout of high density vid

1979-04-25

1982-01-12

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369121, 369109, 369106, 3581285, G11B 700, H04N 584

Patent

active

043109101

ABSTRACT:
Recovery from a record of data recorded in an elongated information track, comprising depressed areas of various lengths alternating with non-depressed areas, is effected by an optical playback system. The playback system employs apparatus for focusing a laser source as a light spot on the information track. A light detector, responsive to light diffracted by the information track as relative motion is established between the light spot and the information track, is used in the playback apparatus to translate the depressions in the information track into frequency-modulated electrical signals. When the light spot size or depression spacing becomes comparable to the wavelength of the laser source, the signal strength at the detector output becomes dependent upon the polarization of the light spot incident on the information track. In the playback system, apparatus is provided for orienting the polarization of the light spot on the information track to enhance the signal strength of the detector output.

REFERENCES:
patent: 3562422 (1971-02-01), McMann, Jr.
patent: 3914057 (1975-10-01), Smith et al.
patent: 4065786 (1977-12-01), Stewart
patent: 4093961 (1978-06-01), Kanamaru
patent: 4100577 (1978-07-01), Naruse et al.
patent: 4139263 (1979-02-01), Lehureau et al.
patent: 4142209 (1979-02-01), Hedlund et al.
patent: 4160270 (1979-07-01), Goldschmidt et al.
Firester, filed Sep. 1975, published in 869 O.G. 002, Dec. 7, 1976.

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