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Magnetic tape and manufacturing method thereof, and servo writer

a technology of magnetic tape and manufacturing method, applied in the field of magnetic tape, to achieve the effect of accurate magnetization

Active Publication Date: 2005-05-19
FUJIFILM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] In such the magnetic tape the servo signal is configured of a pattern that is formed with being magnetized in the reverse direction on the servo band magnetized in any one direction of the longitudinal directions, for example, toward a travel direction of the magnetic tape (this direction is assumed to be “forward direction”). Therefore, when reading the servo signal with a servo signal reading element, a change rate and change amount of a magnetic field at a change portion of a servo pattern magnetized in the reverse direction for a base portion of the forward direction becomes large, thereby an output of the servo signal becoming high. Accordingly, the SN ratio of the read signal of the servo signal can be improved.
[0016] In accordance with such the manufacturing method, the servo band is one-directionally magnetized, for example, toward the travel direction of the magnetic tape (this direction is assumed to be “forward direction”) by the first process; and the servo signal is formed with magnetizing the servo band by the second process. Therefore, since when the servo signal is read with a servo signal reading element of a magnetic head, a change rate and change amount of a magnetic field at a change portion of a servo pattern magnetized in the reverse direction for a base portion of the forward direction become large, thus an output of the servo signal becomes high. Accordingly, the SN ratio of a read signal of the servo signal can be improved.
[0022] Thus configured, a relative position relationship of the DC demagnetizing head and the servo write head can be fixed, and without having an influence of a lateral directional vibration of the magnetic tape, a portion of the servo band can be accurately magnetized in one direction of the longitudinal directions of the magnetic tape.

Problems solved by technology

As a result, in the magnetic tape recording / reproducing apparatus the servo signals SS becomes not able to be accurately read, thereby highly accurate position control of the magnetic head being not able to be performed.

Method used

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  • Magnetic tape and manufacturing method thereof, and servo writer
  • Magnetic tape and manufacturing method thereof, and servo writer
  • Magnetic tape and manufacturing method thereof, and servo writer

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third embodiment

[0033] In FIGS. 6A and 6B, FIG. 6A is a configuration drawing of a servo writer of a third embodiment; and FIG. 6B is a variation example of FIG. 6B.

fourth embodiment

[0034]FIG. 7 is a configuration drawing of a servo writer of a

[0035]FIGS. 8A to 8D are drawings illustrating a magnetic tape with a conventional servo signal; FIG. 8A is a drawing showing a recording current in writing the servo signal; FIG. 8B is a plan view of the magnetic tape; FIG. 8C is a read signal of the servo signal when a width of a servo read element is wide; FIG. 8D is a read signal of the servo signal when the width of the servo read element is narrow.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] Hereinafter, the embodiments of the present invention will be described in detail, referring to the drawings as needed.

first embodiment

[0037] As a first embodiment, one example of a magnetic tape of the present invention will be described.

[0038] As shown in FIGS. 1A to 1C, a magnetic tape MT1 related to the first embodiment has a plurality of servo bands SB1 extending in longitudinal directions of the tape and data bands DB1 positioned between respective servo bands SB1. It is magnetized in the travel direction (see an arrow mark in FIG. 1A, and in the embodiment the direction is referred to as “forward direction” as needed) out of the longitudinal directions of the magnetic tape MT1. In FIG. 1A small arrow marks show a magnetization direction. And magnetizing the servo bands SB1 in the reverse direction, servo signals SS1 are written. The servo signals SS1 form each of servo patterns SP1 by: a burst Ba that is a magnetization portion like two stripes making a positively slanted angle for the travel direction (carrying direction) of the magnetic tape MT1; and a burst Bb that is following the burst Ba and is the mag...

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Abstract

Abstract of the DisclosureA magnetic tape is characterized in that a servo signal for performing tracking control of a magnetic head is written on a data band, data is recorded on the data band, and the servo signal is magnetized and written on the servo band magnetized in any one of direction of longitudinal directions with being magnetized in a reverse direction for the one direction.

Description

Detailed Description of the InventionBACKGROUND OF THE INVENTION[0001] 1. FIELD OF THE INVENTION[0002] The present invention relates to a magnetic tape where a servo signal to perform tracking control for a magnetic head is written, a manufacturing method thereof, and a servo writer.[0003] 2. DESCRIPTION OF THE RELATED ART[0004] These years, in a magnetic tape a high density recording has progressed and there is the tape having a capacity of around 100 gigabytes for a backup of a computer. Therefore, several hundreds of data tracks are formed in the magnetic tape in a lateral direction. Accordingly, a width of a data track extremely becomes narrow, and also a distance between adjacent data tracks extremely becomes narrow. Therefore, in order to make a recording / reproducing element of a magnetic head trace the data track, a servo signal is written in the magnetic tape in advance and with reading the servo signal by the magnetic head, a position of the magnetic head (position of the l...

Claims

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Application Information

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IPC IPC(8): G11B5/78G11B5/008G11B5/02G11B5/584
CPCG11B5/00878Y10T403/75G11B5/584
Inventor NAKAO, TORU
Owner FUJIFILM CORP