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Information recording medium, information recording method and method for mfg. information recording medium

A technology for information recording and media, which is applied in the fields of information recording media, information recording and information recording media manufacturing, and can solve the problems of narrow track width and difficult magnetization patterns.

Inactive Publication Date: 2002-07-24
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, along with further densification, the width of the track is further narrowed, and the following problem occurs in the existing servo method: that is, the magnetic head cannot accurately scan the track (servo, tracking)
Therefore, only a certain amount of magnetic material can be used in the main carrier for magnetic replication, and it is actually difficult to form a fine magnetization pattern

Method used

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  • Information recording medium, information recording method and method for mfg. information recording medium
  • Information recording medium, information recording method and method for mfg. information recording medium
  • Information recording medium, information recording method and method for mfg. information recording medium

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Embodiment 1

[0126] The magneto-optical disk 10 of embodiment 1 of the information recording medium of the present invention can be used in the mode of general hard disk drive, but in order to have replaceability, and make it can carry out contact recording, as figure 1 As shown in (A), a so-called flex disk with a central hole formed in the center is preferable. The flexible disc is placed within a chuck 12 formed of plastic. In addition, an access window (not shown) covered by a metal shutter (not shown) is usually provided on the chuck 12, and recording or reproduction to the magneto-optical disk 10 is performed through the access window. .

[0127] Such as figure 1 Shown in (C), the magneto-optical disc 10 is laminated on the disc-shaped support body in the following order, preferably on the disc-shaped smooth support body 14 and constitutes: magnetically record the magnetic recording layer 16 of information, protect the magnetic recording layer 16 A protective layer 18 to prevent d...

Embodiment 2

[0155] The magneto-optical disk in Embodiment 2 of the information recording medium of the present invention is a so-called hard disk, and has the same structure as the magneto-optic disk in Embodiment 1 except that it is configured as a hard disk, so the description of the same parts is omitted. Explain the difference.

[0156] For the support body 14, a relatively high hardness substrate such as an aluminum substrate, a glass substrate, a polycarbonate substrate, or a graphite substrate is used. The thickness of the supporting body is more suitable between 0.2 mm and 2.0 mm, more suitable between 0.3 mm and 1.2 mm. For recording by the magnetic head, the surface of the support body 14 should be as smooth as possible. Specifically, when the hard disk substrate is produced, polishing is carried out, and the surface roughness measured by an optical surface roughness measuring instrument, the average center line roughness Ra is: within 5nm, preferably within 2nm, measured by a ...

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Abstract

There are provided an information recording medium, including a magnetic recording layer for magnetically recording information. The magnetic recording layer is in advance magnetized for concentrically or spirally around the center of the disk in such a manner that magnetized regions are disposed such that adjacent regions are magnetized in different directions and alternately arranged in the radial direction of the disk. Accordingly, tracking can be continuously performed and accurate tracking servo can also be performed. Also provided a method for recording and reproducing for an information recording medium and a manufacturing method.

Description

technical field [0001] The present invention relates to an information recording medium and a method for recording and reproducing the information recording medium, in particular to an information recording medium magnetically preformat-recording servo information for tracking, and when using the information recording medium to read the servo information and A recording and reproducing method for an information recording medium that performs at least one process of information recording and information reproducing while tracking, in particular, information recording on the information recording medium by using optomagnetism of adjacent field light Record method. [0002] In addition, the present invention also relates to a method of manufacturing an information recording medium, and more particularly, to a method of manufacturing an information recording medium magnetically preformat-recording servo information for tracking. Background technique [0003] With the rapid incr...

Claims

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Application Information

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IPC IPC(8): G11B11/10G11B5/55G11B5/596G11B5/82G11B5/86G11B11/105
CPCB82Y10/00G11B2005/0021G11B5/59677G11B5/743G11B11/10565G11B11/10582G11B11/10576G11B11/10578G11B5/865G11B5/82G11B5/5526G11B5/825G11B11/10526G11B11/10
Inventor 西川正一臼杵一幸宇佐美由久长尾信
Owner FUJIFILM CORP
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