JP2002117517A - Combined magnetic head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head having good floating characteristics of the magnetic head without damaging the magnetic head and magnetic disks. SOLUTION: The center 13 of rotation of the slider which has a rail part 8 to be mounted with a magnetic core 1 for high recording density and a slider block 2 integrally formed with the rail part 8 and is constituted by forming a rail part 9 having a magnetic core 5 and coil 11 for standard recording density on the flank of the slider block 2 facing the rail part to be mounted with the magnetic core 1 for high recording density is arranged with the coil 11 of the magnetic core for standard recording density in such a manner that this coil exists in a position nearly rotationally symmetric with the coil 11 of the magnetic core 1 for high recording density. A working gap 6 of the magnetic core 5 and coil 11 for standard recording density are positioned on the inflow end side A of the slider described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly to a composite magnetic head device used for a high recording density FDD (floppy (registered trademark) disk drive) having backward compatibility.

[0002]

2. Description of the Related Art Conventionally, a high recording density F having backward compatibility
A composite magnetic head device used for a DD (floppy disk drive) or the like is disclosed in Japanese Patent Application Laid-Open No. 9-212818. Such a composite magnetic head device,
As shown in FIG. 5A, the inflow end side A of the slider 58
On the opposite side, a plurality of notches 50 and 51 are provided, and a standard recording density magnetic core 52 and a high recording density magnetic core 53 are provided. 5B, a plurality of notches 54 and 55 are provided on one surface and the opposite surface of the slider 58, the standard recording density magnetic core 56 is provided on the inflow end side A, and the high recording density magnetic core 57 is provided. Is provided on the outflow end side B of the slider 58.

[0003]

FIG. 5 in the prior art
In the magnetic head shape of (b), an adhesive layer of about 100 μm made of glass is provided between the notch portion on the inflow end side A, which is the head when the magnetic head accesses the magnetic disk, and the magnetic core. In consideration of the workability of inserting the magnetic core into the cutout portion, this adhesive layer cannot be suppressed to several tens μm or less, and causes the following problems.

A magnetic head in which the standard recording density magnetic core is provided on the inflow end side A of the slider has a standard recording density FD.
When used as D, because it slides on the magnetic disk,
The adhesive layer of the glass at the inflow end is shaved and dented, and the surface is likely to be concave with respect to the surroundings. At this time, fine particles of the shaved glass enter between the magnetic head and the magnetic disk, and contact between the two. This causes instability and damages the magnetic head and the magnetic disk.

[0005] When a high recording density magnetic head is used as a high recording density FDD, it is used while flying above a magnetic disk. However, the magnetic disk is 3000r
Due to the rotation speed of not less than pm, a slight runout is generated, and the magnetic head is instantaneously brought into contact with the magnetic disk. In such a state, when the magnetic core for high recording density is provided on the other side of the slider, the magnetic head provided with the magnetic core for standard recording density on the inflow end side A of the slider is shaved and the abrasion powder is removed by the magnetic head and the magnetic disk. And the contact between the two becomes unstable, and as a result, the magnetic head for high recording density also repeatedly contacts the magnetic disk, and the adhesive layer of the magnetic head for high recording density is formed of glass. Therefore, due to the difference in workability with the surrounding material, the material tends to be cut in the same manner as described above and become concave with respect to the periphery.

Further, the magnetic head for high recording density is used while flying with respect to the magnetic disk. If the surface of the adhesive layer becomes concave with respect to the surroundings, the abrasion powder accumulates in the concave and the magnetic head or the magnetic disk is used. In addition to causing damage to the magnetic head, it also has an adverse effect on the flow of air above the magnetic head, causing a problem that the flying attitude of the slider becomes unstable.

In order to eliminate the above problem, FIG.
The magnetic core 50 for the standard recording density and the magnetic core 53 for the high recording density are provided in the direction opposite to the inflow end side A of the slider 58 as shown in FIG. The following problems arise when the wear is not affected.

That is, the magnetic head has a standard recording density FDD.
As described above, the slider slides on the magnetic disk when used as a magnetic disk, and floats on the magnetic disk when used as a high recording density FDD. Therefore, the weight balance of the slider is lost when the magnetic disk runs or when the magnetic head seeks, which makes it difficult to maintain the flying posture normally and stably.

The present invention has been made in view of the above points,
An object of the present invention is to provide a magnetic head having good floating characteristics without damaging a magnetic head or a magnetic disk.

[0010]

According to the present invention, there is provided a composite magnetic head device comprising: a slider block facing a magnetic recording medium; and a slider block having an operating gap in the slider block. In a magnetic head having two magnetic cores for recording density and a standard recording density and a coil mounted on each magnetic core, a rail for mounting a magnetic core for high recording density, It has a slider block integrally formed, and a rail having the magnetic core for standard recording density and a coil is bonded to a side of the slider block facing the rail on which the magnetic core for high recording density is mounted. The coil of the standard recording density magnetic core is rotationally symmetric with the coil of the high recording density magnetic core with respect to the rotation center of the slider. Arranged so that, working gap and the coil of the standard recording density magnetic core is characterized in that in the inflow end of the slider.

According to a second aspect of the present invention, the magnetic core for standard recording density forms one rail surface of the slider.

According to the present invention, the composite magnetic head device according to the first aspect of the present invention includes a rail having a standard recording density magnetic core and a coil, and a high recording density magnetic core of the slider block. The coil of the standard recording density magnetic core is arranged symmetrically to the coil of the high recording density magnetic core with respect to the center of rotation of the slider, which is adhered to the side face opposite to the rail on which is mounted. Since the operating gap and the coil of the standard recording density magnetic core are arranged on the inflow end side of the slider, the air flow over the magnetic head is not adversely affected, and the flying attitude of the slider is stabilized. Act on.

Further, in the composite magnetic head device according to the present invention, since the standard recording density magnetic core forms one rail surface of the slider, the standard recording density magnetic core is provided on the inflow end side of the slider. Since there is no glass adhesive layer,
Wear particles, such as glass particles, do not enter the gap between the magnetic head and the magnetic disk, thereby making the contact between the magnetic head and the magnetic disk unstable and preventing the magnetic head and the magnetic disk from being damaged.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a magnetic head according to one embodiment of the present invention. FIG. 2 is a front view (a), a right side view (b), and a top view (c) of the high-density recording core 1, and FIG. 3 is a front view (a) of a magnetic head slider according to an embodiment of the present invention. ), A rear view (b), a left side view (c), and a top view (d).

Hereinafter, the present invention will be described with reference to FIGS. 1, 2 and 3. In FIG. 1, a rail portion 8 for generating a levitation force and a rail portion 9 are provided on both sides of the slider block 2. A rail portion 8 is formed on one side of the slider block 2 and a rail portion 9 is formed on the other side by a method described later, and constitutes a slider of one composite magnetic head.

First, the rail section 8 and the slider block 2
Will be described. The rail section 8 is for mounting the high-density recording core 1. A notch 3 having a groove width slightly larger than the thickness W of the high-density recording core 1 is provided in the rail portion 8, and the high-density recording core 1 is inserted into the notch 3. The core 1 is in contact with the slit side surface from the center of the slider block 2 (see FIGS. 2 and 3), and the end surface 21 of the slider block 2 and the end surface 2 of the core 1
6 form the same surface, and the upper surface 22 of the rail portion 8 and the core 1
Is formed so as to have the same height after processing the rail portion. Further, the end surface 21 of the slider block 2 and the end surface 26 of the core 1 are formed so as to form the same surface, and the operating gap 7 is set at a predetermined position.

After the core 1 is inserted into the notch 3, the glass 4 is placed on the core 1, the glass 4 is melted at a high temperature, and the glass 4 is inserted into the gap between the notch 3 and the high-density recording core 1. To fix the high-density recording core 1. The excess molten glass is then removed by machining. Rail part 8
The slider block 2 is formed integrally with calcium titanate.

The notch 3 penetrates in the thickness direction of the slider block 2 and is formed in a direction along the rotation direction R of the magnetic disk (not shown). The slider block 2 is provided with a groove 14 for accommodating the coil 12 that intersects with the notch 3.
A pair of core holders 15 for holding the high-density recording core 1 are formed above and below the core 4. In addition, slider 2
The disk sliding surface M of No. 5 is processed so that a space between the rail portions 8 and 9 becomes a concave portion along the rotation direction R of the magnetic disk (not shown).

As shown in FIG. 2, the high-density recording core 1 is formed by integrating a pair of core bodies 1a and 1b formed in a U-shape and abutting each other. An operating gap 7 is formed at the butted portion. A recording / reproducing coil 12 is wound around the core body 1b. The coil 12 is wound after the core 1 is inserted into the cutout 3, the glass 4 is filled, and the high-density recording core 1 is fixed.

Surface 2 of rail 8 opposite to cutout 3
Reference numeral 3 (see FIG. 3) denotes an inflow end of the slider 25. In order to improve the floating characteristics of the slider 25, an inclined portion 10 is provided on the rail surface at the inflow end of the rail portion 8. The length of the inclined portion 10 and the width and angle of the rail portion 8 are determined so that the flying characteristics are optimized by the linear velocity of the magnetic disk, the rail width, the load of the magnetic head, and the like.

Next, the rail section 9 will be described. The rail portion 9 is formed of a manganese-zinc ferrite sintered material, and also functions as the standard recording density core 5.
As shown in the front view 3 (a) of FIG. 3, the rail portion 9 is formed by joining a pair of core members 5 a and 5 b formed in a U-shape to form a gap 6 and integrating them with glass 16. An operating gap 6 is formed at the butted portion on the disk sliding surface M side. A coil 11 for recording and reproduction is wound around the core body 5b. The coil 11 is wound after the rail portion 9 is bonded to the slider block 2.

The side of the standard recording density core 5 around which the coil 11 is wound is the inflow end of the slider 25. An inclined portion 10 is provided on the rail surface on the inflow end side A of the rail portion 9 similarly to the rail portion 8 in order to improve the floating characteristics of the slider 25. The length of the inclined section 10 and the width and angle of the rail section 9 are determined in the same manner as the rail section 8 so that the flying characteristics are optimized by the linear velocity of the magnetic disk, the rail width, the load of the magnetic head, and the like.

Standard recording density core 5 also serving as rail 9
Is a bulk type magnetic core having a core width larger than the write / erase track width, and is polished to a predetermined thickness.
Then, the end face 23 of the slider 25 and the end face 24 of the core 5 form the same surface and are bonded by a method described later.

As described above, the standard recording density core 5
After bonding to the slider block 2, the disk sliding surface M of the slider 25 is processed by rails 8 and 9 so as to form a recess along the direction R of rotation of the magnetic disk (not shown). Processing of a slope such as a moving surface and an inflow end is performed.

The slider block 2 and the standard recording density core 5 are connected to the surface of the slider block 2 facing the standard recording density core 5 on the opposite side of the rail portion 8 or to the slider block 2 of the standard recording density core 5. A glass powder is applied to any of the surfaces in contact with each other, and the glass is melted and bonded at a high temperature.

High density recording core 1 provided on rail 8
The position of the standard recording density core 5 provided on the rail section 9 is determined with respect to the slider block 2 as follows. As described above, the end surface 21 of the slider block 2 and the end surface 26 of the core 1 are formed so as to form the same surface, and the operating gap 7 is determined to be at a predetermined position. Similarly, the end surface 23 of the slider block 2 and the end surface 24 of the core 5 form the same surface, and
Is set so that the operating gap 6 of the core 5 is located at a predetermined position described below when the slider 5 is bonded to the slider block 2.

That is, as shown in FIG. 3, with the standard recording density core 5 adhered to the slider block 2, the coil 11 of the standard recording density core 5 is replaced with the coil 12 of the high recording density magnetic core 1 and the slider 12. They are arranged so as to be rotationally symmetrical with respect to the 25 rotation centers 13.

As described above, the rail portion 8 and the slider
Block 2 is integrally formed of calcium titanate
You. The standard recording density core 5 is made of a manganese-zinc based ferrite.
It is made of sintered light. Calcium titanate
Has a density of 0.0039 g / mm ^ThreeAnd manganese-zinc
0.0051mm for system ferrite^ThreeIt is. Therefore,
The standard recording density core 5 was bonded to the rider block 2.
In the state, the standard recording density core 5 becomes heavier and becomes the center of rotation.
In contrast, the weight balance is lost. Coil 11 and coil 12
The weight of both coils is different because the number of turns
Weight is less than 1 mg, so the difference is
It does not matter for the weight of the tool 2.

As described above, when the standard recording density core 5 is adhered to the slider block 2, the weight balance is lost with respect to the center of rotation. FIG. 4 is a diagram of a conventional example showing a state in which the slider block 2 is attached to a suspension 42 of a magnetic head driving device (not shown). 4 (a) is a top view of the suspension 42, and FIG.
(B) is a side view, and 4 (c) is a B-
FIG. 4B is a cross-sectional view of the suspension 42, and FIG.
It is sectional drawing. In FIG. 4, slider block 2
Are bonded to a support plate 43 called a gimbal. A hemispherical projection 41 called a pivot is provided below the gimbal 43 at a position substantially at the center of the slider block 2. In the composite magnetic head of the present invention, the weight balance can be adjusted in the same manner as in the prior art.
Then, the relative positional relationship of the slider block 2 is changed to adjust the collapse of the weight balance, but the description is omitted because it is not the gist of the present invention.

[0030]

According to the present invention, a slider block opposed to a magnetic recording medium, and two magnetic cores having a working gap, one for a high recording density and one for a standard recording density, and each magnetic core having an operating gap. A magnetic head having coils mounted one by one, comprising: a rail for mounting a magnetic core for high recording density; and a slider block formed integrally with the rail, wherein the magnetic core and coil for standard recording density are provided. A coil having the standard recording density magnetic core has a height higher than the center of rotation of the slider, which is formed on the side of the slider block facing the rail on which the high recording density magnetic core is mounted. It is arranged so as to be rotationally symmetric with respect to the coil of the magnetic core for recording density. By but it is the inflow end of the slider, without adversely affecting the flow of the air of the magnetic head flying,
The floating attitude of the slider was stabilized.

The standard recording density magnetic core may be formed by forming one rail surface of the slider. The standard recording density magnetic core may be formed by forming one rail surface of the slider. Even if is provided on the inflow end side of the slider, there is no glass adhesive layer, so that abrasion powder such as fine particles of glass does not enter between the magnetic head and the magnetic disk to make the contact between the magnetic head and the magnetic disk unstable, and the magnetic head and the The magnetic disk was not damaged.

[Brief description of the drawings]

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

FIG. 2 is a development view of a high-density recording core, and FIG.
2 is a front view, FIG. 2B is a right side view, and FIG. 2C is a top view.

3A and 3B are development views of an embodiment of the slider of the composite magnetic head according to the present invention. FIG. 3A is a front view, FIG. 3B is a rear view, and FIG. FIG. 3D is a top view.

FIG. 4 is a diagram in which a slider is mounted on a conventional suspension.

FIG. 5 is a perspective view of a conventional composite magnetic head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-density recording core 2 Slider block 3 Notch part 5 Standard recording-density core 6,7 Working gap 8,9 Rail part 11,12 Coil

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Kuniyuki Takao, 173-1 Asana, Asaba-cho, Iwata-gun, Shizuoka Prefecture Inside Hamamatsu Works, Minebea Co., Ltd. (72) Katsushi Ishigami 1743- Asana, Asaba-cho, Iwata-gun, Shizuoka 1 In Hamamatsu Works, Minebea Co., Ltd. (72) Inventor Tohru Sakurai 173-1 Asana, Asaba-cho, Iwata-gun, Shizuoka F-term (reference) in Hamamatsu Works, Minebea Co., Ltd. BB36 5D111 AA01 AA17 AA24 BB48 BB50 EE02 FF14 FF18

Claims (2)

[Claims] 1. A slider block facing a magnetic recording medium and two magnetic cores having a working gap for a high recording density and a standard recording density, each having an operating gap, and one for each magnetic core. In the magnetic head having a coil, a rail for mounting a magnetic core for high recording density, and a slider block formed integrally with the rail, the rail having the magnetic core and coil for standard recording density, With respect to the center of rotation of the slider, which is formed on the side of the slider block opposite to the rail on which the magnetic core for high recording density is mounted, the coil of the magnetic core for standard recording density has the coil of the magnetic core for high recording density. It is arranged so as to be rotationally symmetric with the coil, and the operating gap and coil of the standard recording density magnetic core are Combined magnetic head device, characterized in that in Nyutan side. 2. The composite magnetic head device according to claim 1, wherein said magnetic core for standard recording density forms one rail surface of said slider.