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Magnetic optical disk, recording and/or reproduction method and appts. using same

An optical disc and recording layer technology, applied in optical recording/reproducing/erasing methods, digital recording/reproducing, recording of information on a magnetic disc, etc., can solve the problems of reducing the amplitude tolerance and increasing the noise of the reproduced signal, etc.

Inactive Publication Date: 2004-10-27
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the mark array of the disc identification information is reproduced under the condition that the MSR effect occurs, the noise of the reproduction signal becomes large, and the reproduction amplitude margin is reduced.

Method used

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  • Magnetic optical disk, recording and/or reproduction method and appts. using same
  • Magnetic optical disk, recording and/or reproduction method and appts. using same
  • Magnetic optical disk, recording and/or reproduction method and appts. using same

Examples

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Embodiment Construction

[0068] Preferred embodiments of the magneto-optical disk of the present invention and its recording and reproducing methods will be described below with reference to the accompanying drawings.

[0069] Example.

[0070] The magneto-optical disk in this embodiment is a disk with a small diameter suitable for use in portable mobile electronic equipment. In the same way as the mini disc (MD), this disc has a transparent base with a diameter of 64 mm and a thickness of 1.2 mm.

[0071] In the magneto-optical disk of this embodiment, a magnetic induction super-resolution (MSR) reproducing system is employed, enabling large-capacity recording. According to the magneto-optical disk of this embodiment, recording and reproduction of moving pictures also becomes possible. The magneto-optical disk of this embodiment can be used in a recording and reproducing apparatus having an optical system based on a wavelength of 780 nm and a numerical aperture (NA) of 0.45. Compatibility with con...

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Abstract

A magneto-optical disk having a small-sized diameter and a large capacity and able to record and reproduce disk discrimination information, and a recording method and a reproducing method of the same, wherein a recording layer including a main recording region in which a first information is recorded, a sub recording region in which a second information including the disk discrimination information is recorded, and a buffer region formed between the main recording region and the sub recording region and in which a third information is recorded is provided on a substrate, the second information is recorded by a mark array formed in stripe shapes in the sub recording region and the buffer region, a plurality of marks constituting the mark array are obtained by changing the magnetization state of the recording layer, and the third information is reproduced by a modulation signal of a reflection ratio along a circumferential direction of the disk.

Description

technical field [0001] The present invention relates to a magneto-optical disk, a recording method for recording information on a magneto-optical disk, and an information reproducing method for reproducing information from a magneto-optical disk. [0002] The recording method and the reproducing method will be collectively referred to as a recording and / or reproducing method. Background technique [0003] In recent years, with an increase in the amount of information, the recording capacity of optical discs has increased, and great progress has been made in the field of digital information processing technology. In Digital Versatile Disc (DVD), MPEG2 compression technology is used - making it possible to record two to four hours of video on one disc. Copying data in digitized video does not cause quality degradation, therefore, when illegal copying is performed, a high-quality copy is illegally produced and seriously infringes the copyright of the video. [0004] For this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/004G11B7/005G11B7/007G11B7/24097G11B11/00G11B11/105G11B19/12G11B20/00G11B20/10
CPCG11B20/00086G11B11/10584G11B7/00736G11B11/10597G11B11/10528G11B19/122G11B11/10515G11B7/24094G11B20/00268G11B7/24082G11B11/105
Inventor 渡边诚宫田一智太田辉之飞田实
Owner SONY CORP
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