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Master information carrier, magnetic recording medium, recording method, and magnetic recording and reproducing apparatus

A recording method and technology for master information, applied in recording/reproducing/deleting methods, magnetic recording, magnetic and optical recording, etc., can solve problems such as difficulty, high price of servo recording device, difficulty in pre-format recording, etc., and achieve low price. Effect

Inactive Publication Date: 2005-05-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, if the above-mentioned method of recording is performed while accurately controlling the position of the magnetic head with a dedicated servo recording device, it takes a long time for pre-format recording.
Also, a dedicated servo recorder is quite expensive
Therefore, the cost of pre-format recording on magnetic recording media is very high
[0008] Second, due to the divergence (expansion) of the recording magnetic field due to the gap between the magnetic head and the magnetic recording medium or the magnetic pole shape of the magnetic head, the magnetization transition at the end of the pre-formatted track lacks sharpness.
However, using the method of (2) above, there are problems in terms of limitations on materials and improvement of corrosion resistance of materials.
In addition, with the method of (3) above, since the aspect ratio of the ferromagnetic thin film 103 increases, it is difficult to form the shape with good precision and stability by photolithography or etching.
Therefore, in the case of using these methods, it is not easy to greatly increase the magnetic field generated from the pattern of the ferromagnetic film 103.
[0020] That is, in the case of using the method of prior document 1, it is difficult to achieve good pre-format recording for a magnetic recording medium with high coercive force required for high-density recording.

Method used

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  • Master information carrier, magnetic recording medium, recording method, and magnetic recording and reproducing apparatus
  • Master information carrier, magnetic recording medium, recording method, and magnetic recording and reproducing apparatus
  • Master information carrier, magnetic recording medium, recording method, and magnetic recording and reproducing apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] figure 1 It is a sectional view of the master information carrier 1 according to the first embodiment of the present invention. On the master information carrier 1, a shape pattern corresponding to the arrangement of information signals is formed on a light-transmitting non-magnetic substrate 2 through a light-shielding ferromagnetic film 3 .

[0086] figure 2 A cross-sectional view is shown when light is irradiated on the master information carrier 1 of this embodiment. The irradiation light 4 is irradiated from a direction perpendicular to the surface on which the light-shielding ferromagnetic thin film 3 is formed. Although the irradiation light 4 can pass through the light-transmitting non-magnetic substrate 2 , it cannot pass through the ferromagnetic thin film 3 . Therefore, the irradiation light 4 can only pass through the region between adjacent ferromagnetic thin films 3 . That is, the region between adjacent ferromagnetic thin films 3 is a region where l...

Embodiment 2

[0124] Figure 13A and Figure 13B It is a cross-sectional view for explaining a method of recording a master information signal on a magnetic recording medium using the master information carrier 1 described in Embodiment 1 as Embodiment 2 of the present invention.

[0125] First, if Figure 13A As shown, a DC degaussing magnetic field 31 is applied to the magnetic recording medium (only the magnetic recording layer 30 is shown in the figure), and the DC degaussing is uniformly performed on the magnetic recording layer 30 in the film surface direction. As a result, DC demagnetization 32 along the film plane direction is formed.

[0126] Next, if Figure 13B As shown, the magnetic recording medium (only the magnetic recording layer 30 is shown in the figure) and the master information carrier 1 that have undergone DC degaussing are disposed opposite to each other. In this state, irradiation with irradiation light 4 is performed, and a DC bias magnetic field 5 having a pola...

Embodiment 3

[0177] Figure 25 It is a schematic explanatory diagram for explaining the magnetic recording and reproducing apparatus according to the third embodiment of the present invention.

[0178] Such as Figure 25 As shown, at least one magnetic disk medium 41 preformatted and recorded by the method of recording a master information signal to a magnetic recording medium according to the present invention is supported on a spindle 42 and rotated by a spindle motor 43 . Furthermore, the thin-film magnetic head 44 is mounted to an actuator arm 46 via a suspension rod 45 , and further, the actuator arm 46 is mounted to an actuator 47 .

[0179] Therefore, the thin-film magnetic head 44 can move on the surface of the magnetic disk medium 41 by operating the actuator 47 . The thin-film magnetic head 44 is arranged opposite to the surface of the magnetic disk medium 41, and by the rotation of the magnetic disk medium 41 and the movement of the thin-film magnetic head 44 in the radial dir...

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Abstract

The purpose of the present invention is to make the main information carrier (1) with the information signal arrangement pattern formed by the light-shielding ferromagnetic film (3) on the non-magnetic substrate (2) of the light transmission property (2) and carry out the DC degaussing in advance In the state where the magnetic recording media are arranged oppositely, the recording magnetization pattern corresponding to the arrangement of the information signal is duplicated and recorded by irradiating the irradiation light (4) and applying a bias magnetic field (5) opposite in polarity to the DC degaussing magnetic field. Thus, even if the coercive force of the magnetic recording medium is large and the copying recording magnetic field from the ferromagnetic film (3) is insufficient, the coercive force can be reduced by heating the light irradiation part to perform a process with excellent signal performance. copy record.

Description

technical field [0001] The present invention relates to a master information carrier for recording digital information signals on a magnetic recording medium, a method for manufacturing the same, a method for recording master information signals to the magnetic recording medium, a method for manufacturing the magnetic recording medium, and a magnetic recording and reproducing (reproducing) device. technical background [0002] In recent years, in order to realize the miniaturization and increase in capacity of magnetic recording and reproducing apparatuses, there has been progress toward higher recording densities. In the field of hard disk drives (hereinafter referred to as HDDs), which are typical magnetic recording and reproducing devices, the areal recording density exceeds 60Gbit / in 2 (93Mbit / mm 2 ) devices have been commercialized, and now, people are discussing 100Gbit / in 2 (155Mbit / mm 2 ), so the technological development is very rapid. [0003] As the main techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/02G11B5/74G11B5/84G11B5/855G11B5/86G11B13/04
CPCG11B5/74G11B5/855G11B5/865G11B13/045G11B2005/0021
Inventor 坂口昌也石田达朗
Owner PANASONIC CORP