Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1993-04-16
1995-09-12
Neyzari, Ali
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369 4414, 369 4438, 369110, G11B 1304
Patent
active
054503760
ABSTRACT:
An optical information recording/reproducing apparatus realizes a direct verifying operation with a simple structure. A light beam emitted from a light source is converged on a track provided on an optical recording medium which is adapted to be moved relatively to the light beam. A super-resolution optical filter is provided in an optical path between the light source and the recording medium. The optical filter functions to produce a first light spot and a second light spot to be irradiated on the track such that the light intensity of the second light spot is lower than that of the first light spot and a recording signal is recorded using the first light spot. The signal recorded on the recording medium using the first light spot is reproduced by use of the reflected light caused upon the irradiation of the second light spot on the recording medium.
REFERENCES:
patent: 4517667 (1985-05-01), Sprague
patent: 4583210 (1986-04-01), Winslow
patent: 5043960 (1991-08-01), Nakao et al.
patent: 5107472 (1992-04-01), Fujiwara et al.
Yamanaka, et al., "High Density Optical Recording by Superresolution," Proc. Int. Symp. on Optical Memory, 1989, Japanese Journal of Applied Physics, vol. 28 (1989) Supplement 28-3, pp. 197-200.
Hoshi Hiroaki
Matsumura Susumu
Yamaguchi Eiji
Yamamoto Masakuni
Canon Kabushiki Kaisha
Neyzari Ali
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