Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-01-24
1997-03-11
Hindi, Nabil
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, 3692753, G11B 700
Patent
active
056108940
ABSTRACT:
Light emitted from a semiconductor laser is collimated by a collimator lens into a parallel beam. The parallel beam enters a phase plate which provides a phase difference of .pi. to a half of the beam. The beam, which has passed through the phase plate, enters an objective lens and is converged onto an optical disc. The optical disc has a number of mark sets along the track, each mark set comprising optically detectable two marks. The beam from the optical disc is collected into the objective lens and is reflected by a polarized beam splitter into a light detector. The output from a light-element of the light detector is delivered to a differential amplifier and a summing amplifier. The outputs from the differential amplifier and summing amplifier are input to a divider. The output from the divider is delivered to an information reproducing unit. The information reproducing unit reproduces information recorded on the optical disc on the basis of the input, and outputs the reproduced information.
REFERENCES:
patent: 3883232 (1975-05-01), Tsunoda
patent: 4006293 (1977-02-01), Bauhuis et al.
patent: 4171879 (1979-10-01), Bricot et al.
patent: 4325135 (1982-04-01), Dil et al.
patent: 4359750 (1982-11-01), Howe
patent: 4450547 (1984-05-01), Nakamura
patent: 4987301 (1991-01-01), Nakamura
patent: 5045868 (1991-09-01), Tajima
patent: 5056080 (1991-10-01), Russell
patent: 5105399 (1992-04-01), Shimonou
patent: 5202878 (1993-04-01), Kanehira et al.
patent: 5291471 (1994-03-01), Russell
patent: 5303224 (1994-04-01), Chikuma et al.
patent: 5329517 (1994-07-01), Yamaguchi et al.
"Isolation of Axi-Symmetrical Optical-Resonator Modes"; Applied Physics Letters, vol. 2, No. 3, Feb. 1, 1963.
Hindi Nabil
Olympus Optical Co,. Ltd.
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