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Method for recording magnetic recording medium

A recording method, a magnetic recording technology, applied in the direction of magnetic recording, magnetic recording head, different recording carrier forms, etc., can solve the problems of lack of steepness, high cost, and expensive magnetization offset at the end of the track

Inactive Publication Date: 2002-02-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for the above-mentioned method of recording while closely controlling the position of the magnetic head using a dedicated servo recording device, much time is required for pre-format recording, and the cost is very high since the dedicated servo recording device is relatively expensive.
[0008] Second, due to the width of the recording magnetic field brought about by the head-medium spacing and the magnetic pole shape of the recording head, there is a problem of lack of steepness in the magnetization shift at the end of the pre-format recorded track.
[0013] First, because it is surface recording, the time required for pre-format recording is very short compared to the recording direction of the original head.

Method used

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  • Method for recording magnetic recording medium
  • Method for recording magnetic recording medium

Examples

Experimental program
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Embodiment 1

[0054] A recording method on a magnetic recording medium according to Embodiment 1 of the present invention will be described with reference to the drawings.

[0055] figure 1 A simple configuration of a recording apparatus for carrying out the recording method of this embodiment is shown. figure 1 Among them, 1 is a disk-shaped hard disk as a disk-shaped magnetic recording medium. In the hard disk 1, a ferromagnetic thin film made of cobalt or the like is formed by sputtering on the surface of an annular disc-shaped aluminum substrate having a central hole 1a. 2 is a disc-shaped master information carrier, which is overlapped and arranged to be in contact with the surface of a magnetic film made of a ferromagnetic thin film or the like of the hard disk 1 . The master information carrier 2 is larger in diameter than the hard disk, and a signal area 2a made of a ferromagnetic thin film is arranged on the surface of the side contacting the hard disk 1 . The ferromagnetic thin...

Embodiment 2

[0087] Figure 15 The magnetized head of Example 2 shown is the first example of the magnetized head used in the recording method of the present invention. Figure 15 Shows a section parallel to the circular magnetic circuit of the magnetic circuit of the magnetization head, that is, a section in the track length direction of an information signal, for example, a section in the circumferential direction of a disk-shaped magnetic recording medium. This magnetized head constitutes a ring-shaped magnetic circuit having a first core half body 21 having a yoke shape and a second core half body 22 having a yoke shape opposing to each other with a gap 23 . The outer peripheral shape of the section parallel to the annular magnetic circuit of this magnetic circuit is substantially formed into a polygon having a curved shape at least at the apex adjacent to the gap 23 portion. Specifically, at least the vertices adjacent to the gap 23, that is, the vertices 24A and 24B in the figure, a...

Embodiment 3

[0097] Figure 19 The magnetized head of Example 3 shown is the second example of the magnetized head used in the recording method of the present invention. Figure 19 Shows a cross section parallel to the circular magnetic circuit of the magnetic circuit, that is, a cross section in the track length direction of an information signal, for example, a cross section in the circumferential direction of a disk-shaped magnetic recording medium. This magnetized head is configured as a ring-shaped magnetic circuit in which a first core half body 31 having a yoke shape and a second core half body 32 having a yoke shape face each other with a gap 33 therebetween. The outer peripheral shape of the cross section parallel to the annular magnetic circuit of the magnetic circuit is formed substantially in a polygon whose inner angle at least at the apex adjacent to the gap portion is 100 degrees or more. that is, Figure 19 As shown, the outer peripheral shape of the cross-section paralle...

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Abstract

A master information carrier (2) with an arranged pattern formed of a ferromagnetic film in a shape corresponding to information signals is superposed on a magnetic recording medium (1) and the arranged pattern formed of a ferromagnetic film is magnetized with a magnetizing head (6), thus transfer-recording the arranged pattern into the magnetic recording medium as a magnetized pattern. The magnetizing head includes an annular magnetic circuit with a gap, and a strength of a magnetic field applied to the master information carrier by magnetic flux leaking from portions other than the gap is set to be 20% or less of that of a magnetic field applied to the master information carrier by magnetic flux leaking from the gap. Quality deterioration due to various conditions during recording can be prevented and uniform recording with less variation depending on position on the magnetic recording medium is achieved.

Description

technical field [0001] The present invention relates to a recording method on a magnetic recording medium for recording a predetermined information signal on a magnetic recording medium used in a magnetic recording and reproducing apparatus. Background technique [0002] In recent years, magnetic recording and reproducing devices tend to have higher recording densities in order to achieve smaller sizes and larger capacities. In the field of hard disk drives, which are typical magnetic recording devices, more than 10Gb / inch 2 (15.5Mb / mm 2 ) devices with an areal recording density of 20Gb / inch have been commercialized in a few years 2 (31.0Mb / mm 2 ) areal recording densities are attracting attention due to accelerated technical progress in practical use. [0003] As the technical background for realizing such a high recording density, there are improvements in the linear recording density brought about by the appearance of new regular signal processing methods such as the ...

Claims

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Application Information

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IPC IPC(8): G11B5/127G11B5/187G11B5/23G11B5/82G11B5/86
CPCG11B5/23G11B5/127G11B5/865G11B5/82
Inventor 石田达朗浜田泰三桥秀幸宫田敬三伴泰明喜多洋三
Owner PANASONIC CORP
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