Optical information recording/reproducing apparatus that produce

Details Optical information recording/reproducing apparatus that produce Optical information recording/reproducing apparatus that produce

1996-10-18

1998-06-16

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, G11B 1100

Patent

active

057682194

ABSTRACT:
An optical information recording and/or reproducing apparatus includes an irradiating device including an objective lens, having a curved surface, for irradiating a recording light beam to a magnetooptical recording medium having at least two magnetic layers, which are a recording layer and a reproduction layer, and which are exchanged-coupled to each other, and a magnetic layer for controlling the exchange-coupling force to block the exchange-coupling force between the recording and reproduction layers, a device for applying an external magnetic field modulated according to an information signal to be recorded on the beam irradiated portion of the recording medium to record information on the recording layer and to orient magnetization of the reproduction layer in a direction parallel to the external magnetic field, a splitting device including a polarizing beam splitter for splitting at least light produced by a magnetooptic effect of the recording medium and light produced by diffraction at the curved surface of the objective lens, a detector including a multi-divided photodetector for respectively detecting the split light beams and a device for producing verifying reproduction signals by executing a predetermined computation using detection signals of the detection surfaces of the photodetector.

REFERENCES:
patent: 4982393 (1991-01-01), Matsushita et al.
patent: 5043960 (1991-08-01), Nakao et al.
patent: 5153868 (1992-10-01), Fujinaga
patent: 5577017 (1996-11-01), Yamamoto et al.
Patent Abstracts of Japan, Kokai No. 58-029151, vol. 7, No. 109, May 1983.
Patent Abstracts of Japan, Kokai No. 02-198044, vol. 14, No. 487, Oct. 1990.
Levenson, et al., "Edge Detection for Magnetooptical Data Storage," Applied Optics, vol. 30, No. 2, Jan. 1991, pp. 232 through 252.
Aratani, et al., "Magnetically Induced Super Resolution in Novel Magneto-optical Disk," Optical Data Storage Topical Meeting, vol. 5, Feb. 1991, pp. 112 through 119.

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