JPH0737224A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head capable of surely forming a guard band with simple structure as a tunnel erasure type magnetic head applied to a floppy disk device. CONSTITUTION:Secondary magnetic circuits 31, 37, 38 are magnetically coupled to a primary magnetic circuit 33 with a formed reading-writing gap 35 to form erasing gaps 40, 41 each having a prescribed interval and extending in the running direction of a magnetic recording medium.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial Application Conventional Technology (FIGS. 8 to 10) Problems to be Solved by the Invention (FIGS. 8 to 10) Means for Solving Problems (FIGS. 1 to 7) Actions (FIGS. 1 to 7) ) Example (1) Configuration of Example (FIG. 1) (2) Effect of Example (3) Other Example (FIGS. 2 to 7) Effect of Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and can be applied to, for example, a tunnel erase type magnetic head applied to a floppy disk device.

[0003]

2. Description of the Related Art Conventionally, in a floppy disk device, a tunnel erase type magnetic head is applied to form a guard band between adjacent recording tracks so that the recording tracks can be efficiently formed. That is, as shown in FIG. 8, in the laminated magnetic head 1, a magnetic circuit composed of a read / write core is formed by combining the EI cores 2 and 3, and the read / write guides at predetermined intervals are formed on the sliding surface with the recording medium. The cap 4 is formed.

A read / write coil 5 having a center tap is wound around a leg of the EI core 2 by a predetermined number of turns, whereby the magnetic head 1 drives the read / write coil 5 with a drive current to perform a recording track. And the recorded information can be reproduced by processing the output signal of the read / write coil 5 during reproduction.

Further, in the magnetic head 1, erase cores 6 and 7 are arranged on the scanning end side of the magnetic head 1 so as to sandwich the combination of the EI cores 2 and 3 from both sides. The erase cores 6 and 7 are EI cores 8 respectively.
And 9 and the EI cores 10 and 11, and the erase gears 12 and 13 formed on the sliding surface with the recording medium at predetermined intervals.
Is designed to form.

Further, the magnetic head 1 has a common erase coil 15 wound around the legs of the erase cores 6 and 7, so that at the time of recording, the erase coil 15 is driven by an erasing DC current to read / write gear tape 4. Both sides of the recording track formed in (1) can be erased again so that guard bands can be formed on both sides of the recording track. Thus, in the laminated magnetic head 1, the read / write core and the erase core are arranged in layers to form the magnetic head.

On the other hand, as shown in FIGS. 9 and 10, the straddle type magnetic head 20 is a magnetic read / write core in which two cores 21 and 22 are combined as in the laminated type magnetic head 1. A read / write gear tape 23 that forms a circuit and has a predetermined interval on the sliding surface with the recording medium.
To form. At this time, the core 22 is formed by an L-shaped core so that the sliding surface extends toward the scanning end end of the recording medium, and the magnetic head 20 comprises a part of the core 22 by an erase core. It is designed to be used as part of a magnetic circuit.

That is, a straddle type magnetic head 20
Are rod-shaped cores 24 and 25 on both sides of the L-shaped core 22.
, And gears 26 and 27 formed by the rod-shaped cores 24 and 25 and the L-shaped core 22 are used as erase gears. Therefore, in the magnetic head 20, the erase coil 15 is wound around the U-shaped core 28, and the U-shaped core 28 is arranged so as to sandwich the rod-shaped cores 24 and 25.

As a result, the straddle type magnetic head 20 is provided.
Drives the erase coil 15 with an erasing DC current, and the magnetic flux formed by the erase coil 15 becomes a U-shaped core 28-.
Rod-shaped core 25-Erase gear trap 26-L-shaped core 22
-Erase gear cap 27-Rod core 24-U-shaped core 28
A magnetic circuit is formed so as to sequentially orbit. As a result, the straddle type magnetic head 20 forms a leakage magnetic flux by the erase gears 26 and 27 extending in a direction orthogonal to the read / write gear, and the leakage magnetic flux can form a guard band.

[0010]

However, as shown in FIG. 8 and FIG.
In the magnetic heads 1 and 20 shown in (1), it is necessary to form the erase core with high accuracy in addition to the read / write core, and there is a problem that the structure and the assembling work are complicated accordingly. Further, by separately driving the erase coil 15, the structure of the floppy disk device becomes complicated accordingly.

The present invention has been made in consideration of the above points, and an object thereof is to propose a magnetic head capable of reliably forming a guard band with a simple structure.

[0012]

In order to solve the above problems, the present invention relates to a magnetic head 30 in which desired areas are recorded by sequentially forming magnetized regions in the magnetic recording medium according to a drive current. A first magnetic circuit 33 having read / write gears 35 formed at predetermined intervals extending in a direction substantially orthogonal to the running direction of the magnetic recording medium on the sliding surface side of the magnetic recording medium and the first magnetic circuit 33. By being rotated and driving the first magnetic circuit 33 according to the drive current,
A read / write coil 5 that forms a magnetized region in the magnetic recording medium by the leakage magnetic flux formed by the read / write gear 35;
The first magnetic circuit 33 is provided on the sliding surface side of the first magnetic circuit 33.
Erase gears 40, 41 are formed between the first magnetic circuit 33 and the first magnetic circuit 33 to extend in the running direction of the magnetic recording medium.
7 and 38.

Further, in the second invention, the first magnetic circuit 33 is formed so that the sliding surface extends in the traveling direction of the magnetic recording medium, and the second magnetic circuits 31, 37 and 38 are
Erase gear cups 40, 41 are held by holding bar-shaped cores 37, 38 magnetically coupled to the first magnetic circuit 33 so that both sides of the sliding surface of the first magnetic circuit 33 are separated from each other by a predetermined distance and sandwiched from both sides. To form.

Further, in the third invention, the rod-shaped core 3
Nos. 7 and 38 have a quadrilateral cross section, and the sides of the quadrilateral on the sliding surface side are the read / write gear 3
5 is formed so as to be inclined at a predetermined angle.

Further, in the fourth invention, the first and second
The magnetic circuits 31, 61 and 31, 61 of the U-shaped core 31 wound around the read / write coil 5 and the U-shaped core 31
It is formed by connecting rod-shaped cores 61 each having a groove formed so as to surround the tips of the legs on the sliding surface side with a predetermined gap therebetween.

Further, in the fifth invention, a rod-shaped core 71
The groove is formed so as to spread in the direction toward the U-shaped core 31.

Further, in the sixth invention, the rod-shaped core 6
1, 71 are formed by laminating predetermined cores 62 to 66 at portions other than the sliding surface.

[0018]

With the first magnetic circuit 33 having the read / write gear 35 formed therein, the second magnetic circuits 31, 37 and 38 magnetically coupled to the first magnetic circuit 33 form the magnetic recording medium. By forming the erase gears 40 and 41 at predetermined intervals extending in the traveling direction, the read / write coil 5 can be driven to simultaneously form the guard band.

Further, rod-shaped cores 37 and 38 magnetically coupled to the first magnetic circuit 33 are held so that both sides of the sliding surface of the first magnetic circuit 33 are separated from each other by a predetermined distance and sandwiched from both sides. By forming the erase gears 40 and 41, this second magnetic circuit can be easily formed.

If the rod-shaped cores 37 and 38 are formed to have a quadrangular cross section and each side of the quadrilateral is formed so as to be inclined at a predetermined angle with respect to the read / write gear 35 on the sliding surface side. The SN ratio of the reproduction signal can be improved.

On the U-shaped core 31 around which the read / write coil 5 is wound, a groove is formed so as to surround the tip of the leg on the sliding surface side of the U-shaped core 31 with a predetermined gap therebetween. The rod-shaped cores 61 described above can be connected to form the first and second magnetic circuits, and the first and second magnetic circuits can be integrally formed.

Further, the groove of the rod-shaped core 71 is formed into the U-shaped core 3
The magnetic field distribution of the guard band can be adjusted by forming the magnetic field distribution so as to spread toward 1.

Further, a method of producing a laminated magnetic head can be applied by laminating predetermined cores 62 to 66 at portions other than the sliding surface to form rod-shaped cores 61 and 71.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Structure of the Embodiment In FIG. 1, reference numeral 30 denotes a straddle type magnetic head generally applied to a floppy disk device, and a U-shaped core 31 and a rod-shaped core 32 are bonded together to form a read / write core 33. To do.

That is, the read / write core 33 has a U-shaped core formed by winding the read / write coil 5 by winding the read / write coil 5 around the leg of the L-shaped core and then sticking a rod-shaped core from below. 31 is formed, and the rod-shaped core 32 is attached to the U-shaped core 31. At this time, the read / write core 33 is formed so as to form the read / write gear 35 at predetermined intervals on the sliding surface side of the magnetic recording medium. In this embodiment, the sliding surface is hatched.

Thus, the magnetic head 30 can record desired data by using the leakage magnetic flux formed by the read / write gear 35, and the desired data can be recorded by using the read / write gear 35. It is designed to be playable. The U-shaped core 31 is formed such that the legs on the sliding surface side are narrowed toward the tip end, whereby the leakage magnetic flux can be efficiently formed by the read / write gear 35.

Further, the magnetic head 30 has cores 37 and 38 which are separated from the read / write gear 35 by a predetermined distance on both sides of the read / write core 33 on the scanning end side of the magnetic recording medium. Here, the cores 37 and 38 are
The magnetic head 30 is a rod-shaped core having a rectangular cross section and a root portion bent into an L-shape.
The root portions of 7 and 38 are bonded to the lower core of the read / write core 33.

As a result, the magnetic head 30 is provided on the sliding surface side of the magnetic recording medium, and between the cores 37 and 38 and the read / write core 33, an erase gear tape 40 and an erase gear tape 40 extending in a direction orthogonal to the read / write gear tape 35. 41, and the cores 37 and 38 and the read / write core 33 are magnetically coupled and held. Thus, in the magnetic head 30, when the read / write coil 5 is driven, a part of the magnetic flux formed by the read / write coil 5 is such that the lower leg of the read / write core 33-the core 37-the erase gear 40-the read / write core 33. Orbit around the upper leg of the
The lower leg, the core 38, the erase gear 41, and the upper leg of the read / write core 33 revolve around.

As a result, the magnetic head 30 drives the read / write coil 5 so that the read / write gear 35 and the erase gears 40 and 41 can sequentially form a magnetized area on the recording medium. At this time, the magnetic head 3
In No. 0, since the erase gears 40 and 41 are formed so as to extend in the direction orthogonal to the read / write gear 35, the magnetized region formed by the erase gears 40 and 41 can be used as a guard band, and thus the density can be increased. It is possible to form a recording track and record / reproduce desired data.

Thus, the magnetic head 30 can drive one read / write coil 5 to form a guard band, and can further simplify the structure of the magnetic circuit, so that the guard band can be surely formed with a simple structure. can do.

(2) Effects of the Embodiments According to the above configuration, the cores 37 and 38 are arranged on both sides of the read / write core so as to be magnetically coupled to the read / write core 33, and the cores 37 and 38 and the read core are read. By forming the erase gears 40, 41 with the write core 33, a guard band can be formed by utilizing the magnetic field formed by the read / write coil 5, and as a result, the guard band can be reliably formed with a simple structure as a whole. can do.

(3) Other Embodiments In the above embodiment, the core 37 having a rectangular cross section is used.
The case where the erase gear tape is formed between the core and the read / write core by using the cores 38 and 38 has been described. However, the present invention is not limited to this, and as shown in FIGS. Shaped core 51, 52 or 5
3, 54 may be used. That is, in the cores 51, 52 or 53, 54 forming the erase gear, if there is a linear edge parallel to the read / write gear on the sliding surface, the reproduced signal of the adjacent track is reproduced at that edge portion, though only slightly. There are features. Therefore, the cores 51, 52 or 53, 54 having the trapezoidal cross section are thus formed.
If the erase gear tape is formed by using, the SN ratio of the reproduced signal can be improved accordingly.

Further, in the above-mentioned embodiment, the case where the cores 37 and 38 having a rectangular cross section are arranged on both sides of the read / write core to form the erase gear is described, but the present invention is not limited to this, and FIG. As shown, the core forming the erase gear and the core forming the read / write gear may be integrated to integrally form the erase gear and the read / write gear.

That is, in the magnetic head 60, a large groove is formed in the core 61 having a rectangular cross section, and this groove is connected to the U-shaped core 31 around which the read / write coil 5 is wound. As a result, the magnetic head 60 has the core 31 on the sliding surface side.
Is formed so as to be surrounded by a groove, and the erase gears 40 and 41 and the read / write gear 35 are integrally formed by the core 31 and the groove.

If formed in this way, the overall structure can be further simplified.

Further, in this case, as shown in FIG. 5, a plurality of cores 62 to 66 may be bonded at a portion other than the sliding surface to form the core 61. In this way, the magnetic head can be easily formed by applying the production method for producing the laminated magnetic head.

Further, in the above embodiment, the case where the erase gears 40 and 41 are formed at a constant interval has been described, but the present invention is not limited to this, and as shown in FIG.
The erase gears 40 and 41 may be formed so as to spread at a predetermined angle. That is, in the case of this magnetic head 70,
By cutting the core 71 having a rectangular cross section, a groove having a straight line extending at a predetermined angle and a bottom side is formed, and the core 71 is connected to the core 31.

Even in this case, the guard band can be reliably formed with a simple structure, and the magnetic flux density of the guard band can be reduced as the distance from the recording track increases.

Also in this case, as shown in FIG. 7, a production method for producing a laminated magnetic head is applied by forming a core 71 by laminating a plurality of cores at portions other than the sliding surface. The magnetic head can be easily formed.

Further, in the above-mentioned embodiments, the case where the present invention is applied to the floppy disk device has been described, but the present invention is not limited to this and can be widely applied to various magnetic recording devices.

[0042]

As described above, according to the present invention, the second magnetic circuit magnetically coupled to the first magnetic circuit having the read / write gear is formed. By forming erase gaps at predetermined intervals extending in the running direction of the magnetic recording medium, the read / write coil can be driven to simultaneously form the guard band, and the guard band can be surely formed with a simple structure. A magnetic head can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head according to an embodiment of the present invention.

FIG. 2 is a plan view showing the second embodiment.

FIG. 3 is a plan view showing the third embodiment.

FIG. 4 is a perspective view showing the fourth embodiment.

FIG. 5 is a perspective view showing the fifth embodiment.

FIG. 6 is a perspective view showing a sixth embodiment.

FIG. 7 is a perspective view showing the sixth embodiment.

FIG. 8 is a perspective view showing a conventional laminated magnetic head.

FIG. 9 is a perspective view showing a conventional straddle type magnetic head.

FIG. 10 is a plan view showing the sliding surface.

[Explanation of symbols]

1, 20, 30, 60, 70 ... Magnetic heads 2, 3,
8-11, 21, 22, 24, 25, 28, 31-3
3, 37, 38, 51-54, 61-66, 71 ... Core, 4, 12, 13, 23, 26, 27, 35, 40,
41 ... Gearup, 5, 15 ... Coil.

Claims (6)

[Claims] 1. A magnetic head for sequentially forming a magnetized area on a magnetic recording medium according to a drive current to record desired data, wherein a running direction of the magnetic recording medium is on a sliding surface side with the magnetic recording medium. A first magnetic circuit having read / write gears formed at predetermined intervals extending in a direction substantially orthogonal to the first magnetic circuit, and the first magnetic circuit wound around the first magnetic circuit according to the drive current. By driving the read / write coil to form the magnetized area in the magnetic recording medium by the leakage magnetic flux formed by the read / write gear, and the first magnetic circuit on the sliding surface side. And a second magnetic circuit magnetically coupled to the first magnetic circuit by forming an erase gear at a predetermined interval extending in the running direction of the magnetic recording medium between the first magnetic circuit and the second magnetic circuit. Characteristic magnetic De. 2. The first magnetic circuit is formed such that the sliding surface extends in the running direction of the magnetic recording medium, and the second magnetic circuit is the sliding surface of the first magnetic circuit. Both sides of the moving surface should be separated from each other by a prescribed distance,
2. The magnetic head according to claim 1, wherein the erase gear cup is formed by holding a rod-shaped core magnetically coupled to the first magnetic circuit. 3. The rod-shaped core is formed to have a quadrilateral cross section, and each side of the quadrilateral is formed so as to be inclined at a predetermined angle with respect to the read / write gear on the sliding surface side. The magnetic head according to claim 2, wherein the magnetic head is formed. 4. The first and second magnetic circuits have a U-shaped core around which the read / write coil is wound and a tip of a leg of the U-shaped core on the sliding surface side at a predetermined distance. The magnetic head according to claim 1, wherein the magnetic head is formed by connecting rod-shaped cores each having a groove formed so as to surround the space. 5. The magnetic head according to claim 4, wherein the groove of the rod-shaped core is formed so as to widen in a direction toward the U-shaped core. 6. The magnetic head according to claim 4, wherein the rod-shaped core is formed by laminating a predetermined core on a portion other than the sliding surface.