JP2002197747A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress static electrification at the time of attaching and operating a magnetic recording medium and the like and to prevent electrostatic destruction of a magneto-resistive head. SOLUTION: Antistatic countermeasure is performed to a thread guide 13 guiding the movement of tape guide rollers 12a, 12b, 12e and 12f winding a magnetic tape 21 on a rotary drum 11 having a magneto-resistive head 11a mounted thereon and gears 14a-14g driving a thread mechanism winding the magnetic tape 21 on the rotary drum 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic recording / reproducing apparatus for recording / reproducing information, and more particularly to a magnetic recording / reproducing apparatus having a magnetoresistive head.

[0002]

2. Description of the Related Art In recent years, the amount of information handled in various fields has increased dramatically, and it has been desired to improve the recording density of a recording medium for recording and storing such information.

One of the methods for recording a huge amount of information is to use a magnetic cassette tape as a recording medium. As a means for improving the recording density, a magnetic cassette tape using a magnetoresistive head (MR head) is used. An information recording / reproducing method to be used is being studied.

[0004] A magnetoresistive head is a recording / reproducing head that records and reproduces information on and from a magnetic recording medium such as a magnetic cassette tape by using a magnetoresistive effect in which electric resistance and current direction change according to an applied magnetic field. The thin-film head, which has been widely used in the past, records and reproduces information by using the amount of magnetic change within a certain range of the magnetic recording medium. Recording and reproduction of information are performed using the magnetism of the medium itself. The magnetoresistive head also has a characteristic that it has higher sensitivity than a thin film head. As described above, in the information recording / reproducing method using the magnetoresistive head, it is possible to increase the density of recorded information as compared with the method using the conventional thin film head, and to store a large amount of information more compactly. Becomes possible.

[0005]

However, the magnetoresistive head has a lower resistance to static electricity than the conventional thin film head, and is easily destroyed by static electricity charged when a magnetic cassette tape is mounted or operated. There is a problem that causes. For example, the electrostatic withstand voltage of the AMR head, which is one of the magnetoresistive heads, is about 200 V or more (FIG. 6A), and the electrostatic withstand voltage of the GMR head is about 40 V (FIG. 6B). However, the charging voltage caused by friction, contact, etc. of various insulating materials such as polyester, plastic, nylon, and vinyl used in the conventional magnetic recording / reproducing device easily exceeds several kV, and the electrostatic breakdown of the head is caused. Voltage will be reached to cause In particular, a thread guide that guides the movement of a tape guide roller that winds a magnetic tape around a rotating drum equipped with a magnetoresistive head, and a gear that drives a thread mechanism that winds the magnetic tape around the rotating drum,
It is generally formed of an insulating material such as polyester, which is one of the points where such electrostatic charges are charged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to suppress static electricity charging during mounting and operation of a magnetic recording medium and to prevent electrostatic damage of a magnetoresistive head. It is an object of the present invention to provide a magnetic recording / reproducing apparatus capable of performing the following.

[0007]

According to the present invention, there is provided a magnetic recording / reproducing apparatus having a magnetoresistive head, wherein a magnetic tape is wound around a rotary drum having the magnetoresistive head mounted thereon. There is provided a magnetic recording / reproducing apparatus characterized in that a sled guide for guiding the movement of a guide roller is subjected to antistatic measures.

Here, the anti-static measures are taken on the thread guide to prevent the thread guide from being charged.
It is possible to prevent electrostatic breakdown of the magnetoresistive head.

In the magnetic recording / reproducing apparatus of the present invention, preferably, the antistatic measure is to form the thread guide with a conductive material. In the magnetic recording / reproducing apparatus of the present invention, preferably, the thread guide is electrically connected to the ground.

In the magnetic recording / reproducing apparatus of the present invention, preferably, the surface resistance of the conductive material constituting the thread guide is 0 Ω / inch ² or more and 1 × 10 ¹² Ω / inch.
inch ² or less.

In the magnetic recording / reproducing apparatus according to the present invention, preferably, the conductive material forming the thread guide is a metal. In the magnetic recording / reproducing apparatus of the present invention, preferably, the antistatic measure is to form an antistatic film on the surface of the thread guide.

In the magnetic recording / reproducing apparatus of the present invention, preferably, the antistatic film formed on the surface of the thread guide is electrically connected to the ground. In the magnetic recording and reproducing apparatus of the present invention, preferably, the surface resistance of the antistatic film formed on the surface of the thread guide is:
0 Ω / inch ² or more and 1 × 10 ¹² Ω / inch ² or less.

In the magnetic recording / reproducing apparatus of the present invention, preferably, the antistatic film formed on the surface of the thread guide is a metal film. Further, in the magnetic recording / reproducing apparatus having the magnetoresistive head, anti-static measures are taken for gears for driving a thread mechanism for winding a magnetic tape around a rotating drum equipped with the magnetoresistive head. Magnetic recording / reproducing apparatus is provided.

Here, by taking anti-static measures for the gears, it is possible to prevent the gears from being charged and to prevent electrostatic breakdown of the magnetoresistive head. Further, in the magnetic recording / reproducing apparatus of the present invention, preferably, in order to prevent static electricity, the gear is formed of a conductive material.

Further, in the magnetic recording / reproducing apparatus of the present invention, preferably, the gear is electrically connected to the ground. Further, in the magnetic recording / reproducing apparatus of the present invention, preferably, the surface resistance of the conductive material constituting the gear is 0Ω /.
Inch ² or more and 1 × 10 ¹² Ω / inch ² or less.

In the magnetic recording / reproducing apparatus of the present invention, preferably, the conductive material forming the gear is a metal. In the magnetic recording / reproducing apparatus according to the present invention, preferably, the antistatic measure is to form an antistatic film on the surface of the gear.

In the magnetic recording / reproducing apparatus according to the present invention, preferably, the antistatic film formed on the surface of the gear is electrically connected to the ground. In the magnetic recording / reproducing apparatus of the present invention, preferably, the surface resistance of the antistatic film formed on the surface of the gear is 0 Ω / inch ² or more and 1 × 10 ¹² Ω / inch ² or less.

In the magnetic recording / reproducing apparatus of the present invention, preferably, the antistatic film formed on the surface of the gear is a metal film.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described.

FIG. 1 is a transparent plan view illustrating the internal configuration of a magnetic tape drive 10 as a magnetic recording / reproducing apparatus according to the present embodiment. As shown in FIG. 1, a magnetic tape drive 10 includes, for example, a rotating drum 1 mounted with a magnetoresistive head and rotating when recording / reproducing on / from a magnetic tape.
1. Tape guide rollers 12a to 12h, which hold a magnetic tape pulled out from a magnetic cassette tape and wind around a rotary drum 11, and tape guide rollers 12a, 12
Thread guide 1 for guiding the movement of b, 12e, 12f
3, tape guide rollers 12a, 12b, 12e, 12
f, and the tape guide rollers 12a, 12b, 12
e and 12f for moving the sleds 15a and 15
b, gears 14a to 14g for driving a thread mechanism for winding a magnetic tape around the rotating drum 11 on which a magnetoresistive head is mounted, and reel receivers 16a and 16b on which reel portions of the mounted magnetic cassette tape are arranged. ing.

The rotary drum 11 has, for example, a cylindrical shape, and a magnetoresistive head (not shown) is mounted on a side surface of the cylindrical shape. Also, as mentioned above,
When recording / reproducing on / from the magnetic tape, the rotating drum 11 rotates about the center line of the cylindrical shape as a rotation axis, and records / reproduces information on / from the magnetic tape wound around the rotating drum 11 as described later. I do.

Each of the tape guide rollers 12a to 12h is, for example, a roller having a cylindrical shape, and is a rotating body that rotates about the center line of the cylindrical shape as a rotation axis. As a material constituting the tape guide rollers 12a to 12h, any material can be used without particular limitation as long as it has a certain level of mechanical strength. It is desirable to be constituted by.

The thread guide 13 has, for example, two thread guide rails 13 a and 13 b having an arc shape along a part of the outer periphery of the rotary drum 11. At the time of winding, the sled guide rail 13a allows the sled moving section 15a on which the tape guide rollers 12e and 12f are mounted to be moved.
Is guided by the sled guide rail 13b to move the sled moving unit 15b on which the tape guide rollers 12a and 12b are mounted.

The sled guide 13 is provided with a predetermined antistatic measure. The antistatic measure for the sled guide 13 allows the sled guide 13 to be charged with static electricity during operation of the magnetic tape drive 10 or the like. To prevent the magnetoresistive head mounted on the rotating drum 11 from being electrostatically damaged by static electricity charged on the thread guide 13.

Here, the countermeasure for preventing static electricity on the thread guide 13 is performed, for example, by forming the thread guide 13 with a conductive material. As the conductive material forming the thread guide 13, for example, the surface resistance is 0Ω / i.
Those having nch ² or more and 1 × 10 ¹² Ω / inch ² or less are desirable. This is because if the surface resistance of the information recording surface of the conductive material becomes too large, the amount of charge on the thread guide 13 during operation of the magnetic tape drive 10 increases, which may cause electrostatic breakdown of the magnetoresistive head. Is increased.

Specific examples of such a conductive material include:
For example, a tin oxide-based material in which tin oxide is doped with antimony, an indium oxide-based material in which indium oxide is doped with tin, and a zinc oxide-based material in which zinc oxide is doped with aluminum or the like are preferable. Further, as a specific trade name, “Toray ABS resin antistatic agent containing grade“ TP40 ”” is desirable. Further, a metal such as stainless steel may be used as such a conductive material.

It is desirable that the thread guide 13 is electrically connected to the ground. As a result, it is possible to discharge the static electricity generated in the thread guide 13 and the like to the ground, suppress the charging of the thread guide 13, and prevent the electrostatic damage of the magnetoresistive head.

Each of the thread moving portions 15a and 15b has a plate shape movable along the thread guide rail 13a, and has a tape guide roller 1 on its upper surface as described above.
2a, 12b, 12e, and 12f are mounted. As a material constituting the thread moving portions 15a and 15b, any material having a certain level of mechanical strength can be used without any particular limitation. However, a conductive material such as metal is used for antistatic reasons and the like. It is desirable to be constituted by.

The gears 14a to 14g transmit power at the time of winding the magnetic tape to a thread mechanism such as thread moving units 15a and 15b for winding the magnetic tape around the rotating drum 11 on which the magnetoresistive head is mounted.

The gears 14a to 14g are provided with predetermined antistatic measures as in the case of the thread guide 13 described above. It suppresses electrostatic charging of the gears 14a to 14g during operation and the like, and prevents the magnetoresistive head mounted on the rotating drum 11 from being electrostatically damaged by static electricity charged to the gears 14a to 14g. .

Here, the antistatic measures for the gears 14a to 14g are performed, for example, by forming the gears 14a to 14g with a conductive material. As the conductive material forming the gears 14a to 14g, for example, the surface resistance is 0Ω / i.
Those having nch ² or more and 1 × 10 ¹² Ω / inch ² or less are desirable. This is because if the surface resistance of the information recording surface of the conductive material becomes too large, the amount of charge on the gears 14a to 14g during operation of the magnetic tape drive 10 increases, which may cause electrostatic breakdown of the magnetoresistive head. This is because it increases the sex.

Specific examples of such a conductive material include:
For example, a tin oxide-based material in which tin oxide is doped with antimony, an indium oxide-based material in which indium oxide is doped with tin, and a zinc oxide-based material in which zinc oxide is doped with aluminum or the like are preferable. Further, as a specific trade name, “Toray ABS resin antistatic agent containing grade“ TP40 ”” is desirable. Further, a metal such as stainless steel may be used as such a conductive material.

It is desirable that the gears 14a to 14g be electrically connected to the ground. As a result, it is possible to discharge the static electricity generated in the gears 14a to 14g to the ground, suppress the charging of the gears 14a to 14g, and prevent the electrostatic damage of the magnetoresistive head. .

FIG. 2 is a transparent plan view of the magnetic tape drive 10 illustrating the arrangement of the sled moving parts 15a and 15b when the magnetic tape is wound around the rotating drum 11. When winding the magnetic tape around the rotating drum 11, the sled moving unit 15a moves on the sled guide rail 13a in the direction B1 shown in FIG. 1, and the sled moving unit 15b moves on the sled guide rail 13b in the direction B2 shown in FIG. Move each. Thereby, the thread moving unit 15a,
15b is a thread guide rail 13a, 13
b, that is, the rotating drum 11 in FIG.
It will be located near the upper part of. The details of the operation of winding the magnetic tape around the rotating drum 11 will be described later.

FIG. 3 is a diagram exemplifying an external configuration of a magnetic cassette tape 20 as a magnetic recording medium. Here, FIG. 3A shows a plan view of the magnetic cassette tape 20, and FIG. 3B shows a bottom view of the magnetic cassette tape 20, respectively.

As shown in FIG. 3, the magnetic cassette tape 2
Reference numeral 0 denotes, for example, a magnetic tape 21 on which various information is recorded by a magnetoresistive head, reels 24a and 24b around which the magnetic tape 21 is wound, a lid 22, which is a case for accommodating the magnetic tape 21, an upper shell 23, and a lower shell. 25.

The magnetic tape 21 is formed on a polymer film such as polyethylene naphthalate, polyether ether ketone, polyphenylene sulfide, polyamide, or polyimide by coating Co, Co—Ni, Co—Fe, Co
-Cr, Co-Ti, Co-Mo, Co-Ni-O, C
It is constituted by forming a ferromagnetic metal thin film such as o-Ni-P, Co-Cr-Nb or the like, and various kinds of information are recorded by magnetizing the ferromagnetic metal thin film.

Lid 22, upper shell 23, reel 24
a, 24b and the material constituting the lower shell 25 include:
Any material having a certain level of mechanical strength can be used without any particular limitation, such as an insulating material such as polyester or plastic. However, it is desirable that the material be made of a conductive material or the like for reasons such as antistatic.

FIGS. 4 and 5 show the magnetoresistive head 1.
FIG. 3 is a schematic view illustrating a state in which a magnetic tape 21 is wound around a rotating drum 11 on which a 1a is mounted. The attachment of the magnetic cassette tape 20 to the magnetic tape drive 10
This is performed by inserting the magnetic cassette tape 20 into the magnetic tape drive 10 in the direction A shown in FIG.
The magnetic cassette tape 20 inserted into the magnetic tape drive 10 is stored with the reel 24a held in the reel receiver 16a and the reel 24b held in the reel receiver 16b. Thereafter, as shown in FIG. The guide tapes 12a, 12b, 12d, 12e to 12g allow the magnetic tape 21
Is pulled out.

The pulled-out magnetic tape 21 is held by the tape guide rollers 12a, 12b, 12d, 12e to 12g while the tape guide rollers 12a, 12b, 1
2 e and 12 f are wound around the rotating drum 11 by moving so as to surround the rotating drum 11. As described above, the tape guide rollers 12a, 12
The movement of b, 12e, 12f is performed by the gear 14a shown in FIG.
To the sled guide rails 13a, 15b to which the power is transmitted by the driving of the sled guide rails 13a, 15b.
This is performed by moving in directions B1 and B2 along 3b. The sled moving units 15a, 1 thus moved
5b is a thread guide rail 1 as shown in FIG.
3a and 13b, thereby reaching the tape guide rollers 12a, 12b and 12 as shown in FIG.
e, the magnetic tape 21 held on the rotary drum 1
1 will be wound.

Here, the gears 14a to 14a during the operation of winding the magnetic tape 21 around the rotating drum 11 are described.
The driving of 4 g and the movement of the sled moving parts 15 a and 15 b on the sled guide 13 are caused by friction between the gears 14 a to 14 g and the sled guide 13 and the sled moving part 15.
a and 15b, and these frictions generate predetermined static electricity. However, as described above, the gears 14a to 14g and the thread guide 13 in the present embodiment are provided with a predetermined antistatic measure, whereby the generated electrostatic gears 14a to 14g are provided.
g and the thread guide 13 are suppressed, and the gear 14a
It is possible to prevent the magnetoresistive head 11a from being electrostatically damaged due to the static electricity charged to the thread guide 13 or the thread guide 13.

As described above, in the present embodiment, since the predetermined antistatic measures are taken for the thread guide 13, the electrostatic charge on the thread guide 13 can be suppressed.
It is possible to prevent the electrostatic breakdown of the magnetoresistive head 11a.

Further, as a measure to prevent the thread guide 13 from being charged, the thread guide 13 is formed of a conductive material, so that the electrostatic charge on the thread guide 13 can be suppressed, and the static electricity of the magnetoresistive head 11a can be suppressed. Destruction can be prevented.

Further, since the thread guide 13 is electrically connected to the ground, the static electricity generated by the thread guide 13 and the like can be discharged to the ground. It is possible to prevent the electrostatic breakdown of the magnetoresistive head 11a.

The conductive material constituting the thread guide 13
Surface resistance of conductive material is 0Ω / inch ^TwoAbove 1 × 10¹²
Ω / inch^TwoBy following the thread guide
13 can be suppressed from being charged with static electricity, and a magnetoresistive head can be used.
It is possible to prevent electrostatic breakdown of the gate 11a.

Further, since the thread guide 13 is made of metal, the electrostatic charge on the thread guide 13 can be suppressed, and the electrostatic damage of the magnetoresistive head 11a can be prevented.

In the present embodiment, since the gears 14a to 14g are provided with a predetermined antistatic measure, the electrostatic charge on the gears 14a to 14g can be suppressed, and the electrostatic damage of the magnetoresistive head 11a can be suppressed. Can be prevented.

Further, since the gears 14a to 14g are made of a conductive material as a measure to prevent the gears 14a to 14g from being charged, the electrostatic charge on the gears 14a to 14g can be suppressed, and the magnetoresistive head 11a Can be prevented from being electrostatically damaged.

The gears 14a to 14g are electrically connected to the ground, so that the gears 14a to 14g
It is possible to discharge static electricity generated by 4 g or the like to the ground, suppress charging of the gears 14a to 14g, and prevent electrostatic breakdown of the magnetoresistive head 11a.

Further, the surface resistance of the conductive material constituting the gears 14a to 14g is set to 0 Ω / inch ² or more and 1 × 10
^The gears 14 a to ¹⁴ Ω / inch ² or less
It is possible to suppress electrostatic charging of the magnetoresistive head 11a, thereby preventing electrostatic damage to the 14g.

Further, since the gears 14a to 14g are made of metal, the charging of the gears 14a to 14g with static electricity can be suppressed, and the electrostatic breakdown of the magnetoresistive head 11a can be prevented.

The present invention is not limited to the above embodiment. For example, in the present embodiment, antistatic measures are applied to the thread guide 13 and the gears 14a to 14g, but antistatic measures may be applied to only a part of them.

Next, a second embodiment of the present invention will be described. This embodiment is a modification of the first embodiment, and is different from the first embodiment only in a method of preventing static electricity on the thread guide 13 and the gears 14a to 14g. In the following, description will be made focusing on differences from the first embodiment, and description of parts common to the first embodiment will be omitted.

In the present embodiment, an antistatic film is formed on the surfaces of the thread guide 13 and the gears 14a to 14g to suppress the charging of the thread guide 13 and the gears 14a to 14g, and the static resistance of the magnetoresistive head 11a. Prevent electrical breakdown.

Here, the material used as the antistatic film has, for example, a surface resistance of 0 Ω / inch ² or more and 1 × 1
It is desirable that the resistance is 0 ¹² Ω / inch ² or less. This is because if the surface resistance of the information recording surface of the antistatic film becomes too large, the amount of charge to the thread guide 13 and the gears 14a to 14g during operation of the magnetic tape drive 10 increases, and the magnetic resistance effect type head 11a This is because the possibility of causing electrostatic breakdown is increased.

Specific examples of such an antistatic film include:
For example, in addition to a tin oxide-based material in which antimony is doped in tin oxide, an indium oxide-based material in which indium oxide is doped with tin, a zinc oxide-based material in which zinc oxide is doped with aluminum or the like, and a patent publication “JP-A-2000-18621”
8 ", a water-soluble conductive polyaniline, a water-soluble conductive polypyrrole, a water-soluble conductive polythiophene,
Water-soluble conductive polyparaphenin, water-soluble conductive polymer such as water-soluble conductive polyparaphenylene vinylene and sulfonic acid, glycol, polyethylene glycol in the molecule,
An antistatic film formed using a conductive resin composition comprising a modified polyester resin containing a hydrophilic group such as a hydroxyl group and a carboxyl group, and a patent publication JP-A-2000-
An antistatic film formed by using a conductive resin composition containing a phenolic antioxidant in a composition comprising a polyarylate and a conductive filler disclosed in Japanese Utility Model Publication No. No. 6,200,040, which is the fourth such as Cr, Cu, Fe, Co, Ni or the like.
An antistatic film formed by vacuum-depositing a material of a periodic element, a conductive material obtained by compounding and attaching conductive zinc oxide fine powder to natural organic fiber powder such as pulp disclosed in Japanese Patent Application Laid-Open No. 2821762. An antistatic film or the like formed using a conductive resin material obtained by mixing a property imparting composition with a resin material is desirable.

The thread guide 13 and the gears 14a-
It is desirable that the antistatic film formed on the surface of 14 g be electrically connected to the ground. Thereby, it is possible to discharge the static electricity generated in the thread guide 13 and the like to the ground, and the thread guide 13 and the gears 14a to
14g, and suppresses charging of the magnetoresistive head 11a.
Can be prevented from being electrostatically damaged.

As described above, in this embodiment, the antistatic film is formed on the surface of the thread guide 13 as an antistatic measure against the thread guide 13, so that the electrostatic charge on the thread guide 13 can be suppressed. It is possible to prevent the electrostatic breakdown of the magnetoresistive head 11a.

Further, by forming the antistatic film formed on the surface of the thread guide 13 to be electrically connected to the ground, the static electricity generated by the thread guide 13 and the like can be discharged to the ground. It is possible to suppress charging of the guide 13 and prevent electrostatic breakdown of the magnetoresistive head 11a.

Further, the surface resistance of the antistatic film formed on the surface of the thread guide 13 is set to 0 Ω / inch ² or more,
By setting it to 1 × 10 ¹² Ω / inch ² or less, the electrostatic charge on the thread guide 13 can be suppressed, and the electrostatic breakdown of the magnetoresistive head 11a can be prevented.

Further, since the antistatic film formed on the surface of the thread guide 13 is formed of a metal film, the electrostatic charge on the thread guide 13 can be suppressed, and the electrostatic damage of the magnetoresistive head 11a is prevented. It becomes possible.

Further, in this embodiment, the gears 14a to 14g
As a countermeasure for preventing static charge on the gears 14a to 14g, an antistatic film was formed on the surface of the gears 14a to 14g.
14g can be suppressed from being charged with static electricity, and electrostatic destruction of the magnetoresistive head 11a can be prevented.

Further, by forming the antistatic film formed on the surfaces of the gears 14a to 14g to be electrically connected to the ground, the static electricity generated by the gears 14a to 14g can be discharged to the ground. , Gear 1
4a to 14g can be suppressed, and the electrostatic breakdown of the magnetoresistive head 11a can be prevented.

Further, the surface resistance of the antistatic film formed on the surfaces of the gears 14a to 14g is set to 0 Ω / inch ² or more,
By setting the resistance to 1 × 10 ¹² Ω / inch ² or less, electrostatic charging of the gears 14a to 14g can be suppressed, and electrostatic damage of the magnetoresistive head 11a can be prevented.

The antistatic film formed on the surfaces of the gears 14a to 14g is made of a metal film, so that the
a to 14 g can be suppressed from being charged with static electricity, and electrostatic destruction of the magnetoresistive head 11 a can be prevented.

The present invention is not limited to the above embodiment. For example, in the present embodiment, antistatic measures are applied to the thread guide 13 and the gears 14a to 14g, but antistatic measures may be applied to only a part of them.

The thread guide 13 and the gear 14a
The antistatic measure of the first embodiment may be applied to a part of the 14 g, and the antistatic measure of the present embodiment may be applied to another part.

Further, the thread guide 13 and the gear 14
At least a part of a to 14 g may be subjected to an antistatic measure in which the antistatic measure according to the first embodiment and the antistatic measure according to the present embodiment are mixed.

[0069]

As described above, in the present invention, since the anti-static measures are taken for the thread guide, the static electricity is prevented from being charged when the magnetic recording medium is mounted or in operation and the like, and the magneto-resistive head can be used. Electrostatic breakdown can be prevented.

Further, since anti-static measures are taken for the gears for driving the sled mechanism, the electrostatic charge is suppressed when the magnetic recording medium is mounted or operated, and the electrostatic damage of the magnetoresistive head is prevented. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a transparent plan view illustrating an internal configuration of a magnetic tape drive as a magnetic recording / reproducing apparatus.

FIG. 2 is a transparent plan view of a magnetic tape drive illustrating the arrangement of a sled moving unit when a magnetic tape is wound around a rotary drum.

FIG. 3 is a diagram illustrating an external configuration of a magnetic cassette tape as a magnetic recording medium. Here, (a) shows a plan view of the magnetic cassette tape, and (b) shows a bottom view.

FIG. 4 is a schematic view illustrating a state in which a magnetic tape is wound around a rotating drum on which a magnetoresistive head is mounted.

FIG. 5 is a schematic view illustrating a state in which a magnetic tape is wound around a rotating drum on which a magnetoresistive head is mounted.

FIG. 6 is a diagram illustrating the anti-electrostatic breakdown characteristics of the AMR head and the GMR head. Here, (a) illustrates the anti-electrostatic breakdown characteristics of the AMR head, and (b) illustrates the GMR
3 illustrates an example of a head withstands electrostatic damage.

[Explanation of symbols]

10 ... magnetic tape drive, 11 ... rotary drum, 11a
... Magnetoresistance effect type head, 12a-12h ... Tape guide roller, 13 ... Thread guide, 13a, 13b ... Thread guide rail, 14a-14g ... Gear, 15a
15b: sled moving unit, 20: magnetic cassette tape,
21 ... Magnetic tape

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Nobuyuki Nagai, 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Tadashi Tadashi, 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (18)

[Claims] 1. A magnetic recording / reproducing apparatus having a magnetoresistive head, wherein an antistatic measure is provided for a sled guide that guides movement of a tape guide roller that winds a magnetic tape around a rotating drum on which the magnetoresistive head is mounted. A magnetic recording / reproducing apparatus characterized by performing the following. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the antistatic measure is to form the thread guide with a conductive material. 3. The magnetic recording / reproducing apparatus according to claim 2, wherein the thread guide is electrically connected to a ground. 4. The magnetic recording / reproducing apparatus according to claim 2, wherein the conductive material has a surface resistance of 0 Ω / inch ² or more and 1 × 10 ¹² Ω / inch ² or less. 5. The magnetic recording / reproducing apparatus according to claim 2, wherein the conductive material is a metal. 6. The magnetic recording / reproducing apparatus according to claim 1, wherein the antistatic measure is to form an antistatic film on a surface of the thread guide. 7. The magnetic recording / reproducing apparatus according to claim 6, wherein the antistatic film formed on the surface of the thread guide is electrically connected to a ground. 8. The magnetic recording / reproducing apparatus according to claim 6, wherein the antistatic film has a surface resistance of 0 Ω / inch ² or more and 1 × 10 ¹² Ω / inch ² or less. 9. The magnetic recording / reproducing apparatus according to claim 6, wherein the antistatic film is a metal film. 10. A magnetic recording and reproducing apparatus having a magnetoresistive head, wherein a gear for driving a thread mechanism for winding a magnetic tape around a rotary drum having the magnetoresistive head is provided with an antistatic measure. A magnetic recording / reproducing apparatus characterized by the above-mentioned. 11. The magnetic recording / reproducing apparatus according to claim 10, wherein the antistatic measure is to form the gear from a conductive material. 12. The magnetic recording / reproducing apparatus according to claim 11, wherein the gear is electrically connected to a ground. 13. The magnetic recording / reproducing apparatus according to claim 11, wherein the conductive material has a surface resistance of 0 Ω / inch ² or more and 1 × 10 ¹² Ω / inch ² or less. 14. The magnetic recording / reproducing apparatus according to claim 11, wherein the conductive material is a metal. 15. The magnetic recording and reproducing apparatus according to claim 10, wherein the antistatic measure is to form an antistatic film on a surface of the gear. 16. The magnetic recording and reproducing apparatus according to claim 15, wherein the antistatic film formed on the surface of the gear is electrically connected to a ground. 17. The magnetic recording / reproducing apparatus according to claim 15, wherein the surface resistance of the antistatic film is 0 Ω / inch ² or more and 1 × 10 ¹² Ω / inch ² or less. 18. The magnetic recording / reproducing apparatus according to claim 15, wherein the antistatic film is a metal film.