JPH06259719A - Levitation type combined magnetic head - Google Patents

Abstract

PURPOSE:To prevent stress from acting on a magnetic core when the magnetic core is fixed in a slit in a slider and to enhance reproduction output. CONSTITUTION:The space between the inside of a slit 2 in a slider 1 and a magnetic core 3 fixed in the slit 2 is regulated to 35-55mum at the side opposite to the magnetic gap 5 side and to <=1/3 of the 35-55mum space and <=20% of the thickness of the magnetic core 3 at the magnetic gap 5 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for a magnetic tape device and a magnetic disk device for recording / reproducing information on / from a magnetic disk, and more particularly to a flying type in which a magnetic core is fixed in a slit of a slider. It is a composite magnetic head.

[0002]

2. Description of the Related Art A levitation type magnetic head is designed to be levitation by a relative air flow with respect to a rotating magnetic disk. As such a levitation type magnetic head, a thin film head and a magnetic core are integrally formed with a slider. The monolithic type in which the slider itself constitutes a part of the main magnetic path and the composite type (composite type) in which a magnetic core is inserted into the slit of the slider and fixed by a glass material are used.

As a magnetic core used in a composite type magnetic head, as shown in FIG. 2, a pair of magnetic core pieces 3 are used.
The magnetic film 6 is adhered to the respective facing surfaces of a and 3b, and the glass material 7 is formed so that the gap portion 5 is provided at the outer end of the magnetic film.
It is joined with. The magnetic core 3 configured in this way is
Insert it into the slit 2 of the slider 1 as shown in Fig. 1,
Although it is temporarily fixed by a spring material, in this case, the slit 2 is formed to have the same width on both the facing side and the back side of the magnetic disk, which is different from that of FIG. The surface of the magnetic core 3 facing the magnetic disk (head gap side) is fixed with a glass material 9, and the back surface side is fixed with a spring material and a resin.

When the magnetic core 3 is fixed in the slit 2, molten glass is poured and fixed in the gap between the magnetic core 3 and the slit 2. However, the glass material 7 to which the magnetic film 6 of the magnetic core 3 is fixed becomes soft, and the magnetic film 6 is displaced, so that the frequency characteristic of the reproduction output is undulated. Therefore, the thickness of the magnetic core 3 is 5
Japanese Patent Application Laid-Open No. 1-189020 describes that a 100 μm glass layer is provided to firmly fix the magnetic core in the slit to prevent the undulation phenomenon.

[0005]

There is a conventional composite type magnetic head in which, when the magnetic core is fixed in the slit of the slider, the magnetic film of the magnetic core is displaced so that no waviness occurs. However, there is a problem that the reproduction output of the magnetic head is reduced after the magnetic core is fixed by pouring a glass material into the slit. As a result of the present inventor's research on the cause of such a problem, the glass poured into the gap between the inner surface of the slit and the magnetic core and the slider material on both sides of the slit have different thermal expansion amounts, and thus the magnetic core It was considered that the stress acts and the reproduction output is reduced as described above. Therefore, it is conceivable to reduce the amount of glass injected into the magnetic core and the inner surface of the slit to reduce the influence of stress due to the volume change of glass.
If the slit width is reduced, the spring material for fixing the back side of the magnetic core to the magnetic disk side cannot be inserted into the slit.

Therefore, according to the present invention, when the magnetic core is fixed in the slit of the slider, the thickness of the glass layer applied for fixing the surface facing the magnetic disk is reduced so that stress is applied to the magnetic core fixed in the slit. It is an object of the present invention to make the magnetic core hard to act and to firmly fix the magnetic core in the slit on the back side with respect to the magnetic disk side by the spring material and the resin. Further, the reproduction output is made desirable by defining the thickness of the glass layer for fixing the magnetic core in the slit.

[0007]

The present invention achieves the above object in a flying type composite magnetic head in which a magnetic core is inserted into a slit of a slider and the magnetic gap side of the magnetic core is fixed with a glass material. Is. Therefore, the gap between the inner surface of the slit of the slider and the magnetic core is 35 to 55 μm on the side opposite to the magnetic gap side, and the magnetic gap side is less than ⅓ of the gap on the side opposite to the magnetic gap side.

The gap on the side opposite to the magnetic gap side is set to 35-5.
The size of 5 μm is set so that there is no inconvenience in putting a spring material or resin in the space, and the gap side is set to 1/3 or less so that the thermal expansion amount of the glass is within the allowable range. Because you can do it. Also, in a flying composite magnetic head in which the magnetic core is inserted into the slit of the slider and the magnetic gap side is fixed with a glass material, the gap between the inner surface of the slit on the magnetic gap side and the magnetic core is 20% or less of the thickness. The gap on the side of the magnetic gap is set to 20% or less of the thickness of the magnetic core in order to reduce the stress on the magnetic core due to the thermal expansion of the glass layer and prevent the reproduction output of the magnetic head from decreasing.

[0009]

In the above flying type composite magnetic head, the gap between the magnetic core and the inner surface of the slit of the slider is formed to be 20% or less of the thickness of the magnetic core. Therefore, the glass layer for fixing the magnetic core is formed. Since the thickness of the glass is thin and the amount of thermal expansion of the glass layer can be made minute, stress is less likely to act on the magnetic core, and the reproduction output of the magnetic head can be improved. In addition, the gap between the magnetic core and the inner side surface of the slit of the slider is widened on the side opposite to the magnetic gap side. Therefore, after placing a spring material within the gap and positioning, the magnetic gap side was fixed with a glass material. A series of operations for fixing with resin later is easy.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the flying type composite magnetic head of the present invention will be described with reference to FIGS. The magnetic head has a structure in which a magnetic core 3 is inserted and fixed in a slit 2 of a slider 1 made of a non-magnetic material. The slider 1 is provided with two slider rails 4, the surfaces of which are opposed to the magnetic disk, and the slider is levitated at minute intervals by the air flow caused by the rotation of the magnetic disk. Further, the slit 2 of the slider 1 is provided at the position of one slider rail 4 in parallel with it, and the magnetic gap 5 of the magnetic core 3 can face the magnetic disk. The magnetic core 3 has a pair of core pieces 3 as shown in FIG.
The magnetic film 6 is adhered to the opposing surfaces of a and 3b, the pair of core pieces are fixed by the glass material 7, and the winding window 8 is provided on the core piece 3b to wind the coil on the core piece 3a. Has been.

(Embodiment 1) In the flying type composite magnetic head described above, the width of the slit 2 of the slider 1 is narrower on the magnetic gap 5 side of the magnetic core 3 as shown in FIG. Formed wider. Then, the magnetic core 3 is inserted into the slit 2 of the slider at a predetermined position, the side opposite to the gap side of the magnetic core 3 is temporarily fixed with the spring material 10, and then the magnetic core 3 and the inner surface of the slit 2 are The magnetic gap 5 side is fixed with a glass material 9. Next, after removing the spring material 10 in the gap on the opposite side to the magnetic gap side, the side of the magnetic core 3 opposite to the magnetic gap side was fixed by the resin 11. When fixing the magnetic gap 3 side of the magnetic core 3 with the glass material 9, since the width of the magnetic core 3 on the side facing the magnetic disk on the magnetic gap 5 side is narrow, the glass material 9 is injected and fixed on both sides thereof. To be done.

Next, in the floating magnetic head, the ratio of the distance d ₁ on the magnetic gap 5 side to the distance d ₂ on the opposite side of the distance between the inner surface of the slit 2 and the magnetic core 3 is calculated. The maximum stress of the gap portion generated in the magnetic core was measured when the magnetic gap depth was changed with various changes, and the reproduction output of those magnetic heads was also measured.
The core thickness of the magnetic core is 102 μm, and the track width is 8 μm.
μm, and the gap length is 0.35 μm. The result is
The results are shown in Table 1. From Table 1, among the distances between the inner surface of the slit of the slider and the magnetic core, when the ratio of the distance between the magnetic gap side d ₁ and the opposite side d ₂ becomes 1/3 or less, the stress becomes small and the reproduction output becomes large. I understand. Further, in order to make it easier to insert the spring material 10 on the side opposite to the magnetic gap 5 in the space between the magnetic core 3 and the inner surface of the slit 2, the space of that portion needs to be at least about 35 μm, and it is fixed to make it too large. Since it becomes unstable, it is desirable to set it to 55 μm or less.

[0013]

(Embodiment 2) Next, in the flying type composite magnetic head, of the distances between the inner surface of the slit 2 of the slider 1 and the magnetic core 3, the distance d ₁ on the magnetic gap 5 side.
Various magnetic heads were produced by changing the% ratio between the magnetic core 3 and the thickness of the magnetic core 3 and the magnetic gap depth, and the reproduction outputs of these magnetic heads were measured. The results are shown in FIG. It can be seen from FIG. 4 that the reproduction output increases as the ratio% of the distance d ₁ on the magnetic gap 5 side to the thickness of the magnetic core 3 decreases. The magnetic gap depth is usually 3μm or less,
Since it is said that the reproduction output is preferably 0.15 uVpp / um · t · m / s, the distance d on the magnetic gap side is
It is understood that the ratio of ₁ to the thickness of the magnetic core 3 should be 20% or less.

[0015]

In the levitation type composite magnetic head of the present invention, the distance between the inner surface of the slit of the slider and the magnetic core is
Since the magnetic gap side is set to 1/3 or less of the opposite side, the thickness of the glass layer for fixing the magnetic core becomes small, and the amount of thermal expansion can be suppressed small. For this reason,
It becomes difficult to apply stress to the magnetic core, and the reproduction output of the magnetic head can be improved. Further, since the width of the space on the side opposite to the magnetic gap is suitable for inserting the spring material, the work of fixing the magnetic core in the slit of the slider is easy. Of the distance between the inner surface of the slit of the slider and the magnetic core, the distance on the magnetic gap side is
Since the thickness of the magnetic core is set to 20% or less, thermal expansion of the glass material fixing the magnetic core hardly exerts stress on the magnetic core, and the reproduction output of the magnetic head can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a flying type composite magnetic head.

FIG. 2 is a perspective view of a magnetic core fixed in a slit of a slider.

FIG. 3 is a partially enlarged view of a state where a magnetic core is fixed in a slit of a slider.

FIG. 4 is a relationship diagram between a magnetic gap depth of a magnetic head and a reproduction output.

[Explanation of symbols]

 1 Slider 2 Slit 3 Magnetic core 5 Magnetic gap 9 Glass material 10 Spring material

Claims (2)

[Claims] 1. In a flying type composite magnetic head in which a magnetic core is inserted into a slit of a slider and the magnetic gap side of the magnetic core is fixed with a glass material, the distance between the inner surface of the slider slit and the magnetic core is The flying-type composite magnetic head is characterized in that the side opposite to the magnetic gap side is set to 35 to 55 μm, and the magnetic gap side is set to 1/3 or less of the distance on the side opposite to the magnetic gap side. 2. A composite type magnetic head in which a magnetic core is inserted into a slit of a slider, a magnetic gap side thereof is fixed with a glass material, and magnetic recording / reproduction is performed with a magnetic disk. A flying-type composite magnetic head, characterized in that the gap between the inner side surface of the slit on the gap side and the magnetic core is formed to be 20% or less of the thickness of the magnetic core.