JPH06325319A - Magnetic head - Google Patents

Abstract

PURPOSE:To execute secure gap joining of first and second core half bodies by suppressing the generation of air bubbles in a glass material for gap joining of these first and second core half bodies. CONSTITUTION:This magnetic head is constituted by gap joining of the first core half body 1a and the second core half body 1b via a gap spacer which constitutes the magnetic gap 10. Crystallized glass 91 is packed into a glass packing groove 73 formed on at least the one gap forming side surface of the first and second core half bodies 1a, 1b described above. This crystallized glass 91 is heated up to its yield point temp. As a result, the first and second core half bodies 1a, 1b are gap-joined by the glassy material oozing from the crystallized glass 91.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording device such as a VTR or a magnetic disk device.

[0002]

2. Description of the Related Art In recent years, as a magnetic head used in a magnetic recording device for handling a wide band signal such as a high definition VTR digital VTR, for example, a laminated core type magnetic as disclosed in Japanese Patent Laid-Open No. 62-119709. A head is proposed.

FIG. 11 is a perspective view showing the appearance of the above-mentioned conventional laminated core type magnetic head, and FIG. 12 is a view showing the medium sliding contact surface of the magnetic head.

In the figure, 1a and 1b are first and second core halves.
Yes, the first and second core halves 1a and 1b are crystallized, respectively.
First non-magnetic group made of glass, non-magnetic ceramics, etc.
The ferromagnetic metal film 4 such as sendust and Si on the plates 21 and 21.
O₂Laminated films 3 and 3 with the insulating film 5 such as
Then, the second non-magnetic substrate 22, 22 is sealed on the glass.
6 and 6 are joined and fixed. The first core half 1a
A glass filling groove 71 is wound around the second core half 1b.
Each line groove 8 is formed. The first and second core halves
Reference numerals 1a and 1b are the ones in which the end faces of the laminated films 3 and 3 are exposed.
With the surfaces on the cap forming side butted against each other,
The second groove filled in the space filling groove 71 and the upper end of the winding groove 8
Gap-bonded by the sealing glass 9, and the bonded surface
Is SiO ₂Form a magnetic gap 10
Is made.

The sealing glass 6 for bonding the second non-magnetic substrate 22 on the laminated film 3 has a softening point of 500.
~ 600 ℃, glass welding temperature is 600 ~ 700
No. 2 used for gap junction
The sealing glass 9 has a lower melting point (softening point of 350 to 500 ° C.) than that of the sealing glass 6 in order to prevent deformation due to remelting of the sealing glass 6 during gap bonding.
The second sealing glass 9 having a low melting point is heated to 450 ° C. to 600 ° C., which is 50 ° C. to 100 ° C. higher than the softening point, and melted to perform the gap bonding.

However, in the above-mentioned conventional magnetic head, the second sealing glass 9 has the first and second core halves 1a and 1a.
b, the first and second non-magnetic substrates 21 and 2 that make up most of b
Since the mechanical strength is weaker than that of No. 2, there is a problem that cracks are likely to occur at the time of manufacturing the magnetic head and defects such as gap opening and chip cracking occur.

Further, since the gap bonding is performed by melting the second sealing glass 9, the bubbles are generated in the second sealing glass 9 due to the contamination of the bonding surface during the melting, There is a problem that sufficient gap bonding strength cannot be obtained due to bubbles. Therefore, it is necessary to strictly control the joining conditions during gap joining.
There is also a problem that the manufacturing process becomes complicated.

Further, the bubbles not only reduce the strength of the gap joint, but also form a hole in the medium sliding contact surface to reduce the contact with the magnetic medium. Therefore, the shape of the medium sliding contact surface is processed so that the second sealing glass 9 does not appear on the medium sliding contact surface, or the second sealing glass 9 is processed.
The position of the glass filling groove 71 filled with
It is necessary to take measures such as providing it on the side surface away from zero. However, even in this case, there arises a problem that the manufacturing process becomes complicated and the strength of the gap junction is lowered.

The above problems are not limited to the above-mentioned laminated core type magnetic head, but are applicable to ferrite heads and M-type magnetic heads.
Similar problems occur in magnetic heads of other structures such as IG (metal-in-gap) type heads.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the drawbacks of the above-mentioned conventional example, and it is a glass material for gap-bonding the first and second core halves without complicating the manufacturing process. It is an object of the present invention to provide a magnetic head that suppresses the generation of bubbles and has a sufficient gap junction strength.

[0011]

The present invention provides a magnetic head in which a first core half body and a second core half body are gap-joined via a gap spacer which serves as a magnetic gap.
A groove formed on at least one of the first and second core halves on the surface on which the gap is formed is filled with crystallized glass, and the first and second glass materials exude from the crystallized glass.
It is characterized in that the core halves are gap-joined.

Furthermore, the present invention is characterized in that the crystallized glass is heated to a deformation point temperature to exude vitreous from the crystallized glass.

[0013]

According to the above structure, the glass material for gap-bonding the first and second core halves is exuded from the crystallized glass, so that the glass material for gap-bonding is melted. Therefore, the generation of bubbles during gap bonding is reduced, and sufficient gap bonding strength can be obtained.

[0014]

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

FIG. 1 is a perspective view showing the appearance of the magnetic head of this embodiment, and FIG. 2 is a view showing the medium sliding contact surface of the magnetic head. The same parts as those in FIGS. 11 and 12 are designated by the same reference numerals. I will omit the explanation.

In the magnetic head of this embodiment, a glass filling groove 72 is formed below the winding groove 8 on the gap forming side surface of the second core half body 1b.
The upper end of the winding groove 8 is filled with crystallized glass 91. The first and second core halves 1a and 1b are gap-bonded by vitreous material exuding from the crystallized glass 91, and the magnetic gap 10 formed by interposing SiO ₂ or the like is formed on the bonding surface. ing. The crystallized glass 91 is a Li ₂ O—SiO ₂ system, and its characteristics are a thermal expansion coefficient of 120 × 10 ⁻⁷ / ° C., a yield point of 540 ° C., a Vickers hardness of 580 kg / mm ² , and a bending strength of 2200.
It is kg / cm ² .

Next, a method of manufacturing the magnetic head of the above embodiment will be described.

First, as shown in FIG. 3, a laminated film 3 of a ferromagnetic metal film 4 and an insulating film 5 is formed on the upper surface of a non-magnetic substrate 12 made of crystallized glass by sputtering or the like to a thickness of 5 to 20 μm.
The thick substrate is applied to form the laminated substrate 15. Incidentally, the laminated substrate 15, in order to improve the strength of the bond, which will be described later, SiO ₂ on the top surface of the laminated film 3, Ti ₂ O, protection 0.1~0.5μm thickness of ZnO or the like film ( (Not shown) is formed.

Next, as shown in FIG. 4, the laminated substrate 1
Prepare a plurality of 5 and stack them, each Na ₂ O-Al ₂ O
_A high melting point sealing glass 6 having a deformation point of 570 ° C. made of _3- SiO ₂ system or the like is heated and melted at a temperature of 700 ° C. to be glass-bonded and integrated to form a laminated block 16. A second non-magnetic substrate 12 'is bonded and fixed to the uppermost surface of the laminated block 16.

Next, by cutting along the broken lines aa 'and bb' in FIG. 4, a pair of first and second laminated head pieces 17a, 17b are formed as shown in FIG. .

Next, as shown in FIG. 6, the laminated film 3 is formed on the surface of the second laminated head piece 17b on the side where the gap is formed.
Two glass filling grooves 72 are formed so as to be orthogonal to.

Next, as shown in FIG. 7, the above-mentioned crystallized glass 91 is filled in the two glass filling grooves 72 of the second laminated head piece 17b. As a method of filling the crystallized glass 91 at this time, a method of coating and firing glass powder, a method of joining blocks of crystallized glass with a high melting point glass, a crystallized glass at a yield point temperature of a non-magnetic substrate There is a method such as direct solid-phase bonding to 12.

Next, as shown in FIG. 8, the winding groove 8 is formed by performing groove processing so as to be adjacent to one of the two glass-filled grooves 72.

Next, the first laminated head piece 17a
After forming a non-magnetic layer (not shown) such as a SiO ₂ gap spacer on the surface on the side where the gap is formed, as shown in FIG. 9, the first laminated head piece 17a and the second laminated head piece 17a shown in FIG. The surfaces of the laminated head piece 17b on the side where the gap is formed are butted against each other, and the crystallized glass 91 is heated to about 1 ° C under a pressure of about ² kg / cm ² at a deformation point temperature of the glass of 540 ° C.
Hold for time. By virtue of this heating and pressure holding, the vitreous substance contained in the crystallized glass 91 exudes and reacts with the non-magnetic substrate 12 of the first laminated head piece 17a. As a result, the first and second laminated head pieces 17a and 17b are gap-joined to form the laminated head block 18.

Thereafter, the laminated head block 18 is cut along the broken lines cc 'and dd'shown in FIG. 10 to form a plurality of laminated head chips, and the laminated head chips are processed into a predetermined shape. By doing so, the laminated core type magnetic head of this embodiment shown in FIG. 1 is completed. By the cutting step, the nonmagnetic substrate 12 is divided into the first nonmagnetic substrate 121 and the second nonmagnetic substrate 122.

In the magnetic head of this embodiment as described above,
The first and second core halves 11a and 11b are made of crystallized glass 9
By heating in the vicinity of the deformation point temperature lower than the softening point of the vitreous substance in No. 1, the non-magnetic substrate 1 of the first core half body 11a
Since the gap bonding is performed by the glass exuding from the crystallized glass 91 formed on the surface of the gap forming side of 21, 21 and 122, the glass for gap bonding does not melt at a temperature higher than its softening point as in the conventional case. There is almost no generation of bubbles due to dirt on the joint surface. Moreover, the glass for gap bonding, which exudes from the crystallized glass 91, contains a crystalline material and is excellent in chemical durability and mechanical strength. Further, the glass material exuded from the crystallized glass 91 is not exposed on the medium sliding contact surface, and uneven wear does not occur on the medium sliding contact surface.

In the above-described embodiment, the laminated core type magnetic head has been described. However, other than that, for example, a magnetic body in which the first and second core halves are composed only of a ferromagnetic oxide material such as ferrite. MI in which the head and the first and second core halves are compounded with a ferromagnetic oxide material and a ferromagnetic metal material
The present invention can also be applied to a G type magnetic head or the like by optimizing the thermal expansion coefficient and the yield point temperature of the crystallized glass material.

[0028]

According to the present invention, it is possible to suppress the generation of bubbles in the glass material for gap-bonding the first and second core halves without complicating the manufacturing process. The two core halves are firmly gap-joined, and a magnetic head having excellent mechanical strength can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing the appearance of a magnetic head of the present invention.

FIG. 2 is a diagram showing a medium sliding contact surface of the magnetic head of the present invention.

FIG. 3 is a perspective view showing a method of manufacturing a magnetic head of the present invention.

FIG. 4 is a perspective view showing a method of manufacturing a magnetic head of the present invention.

FIG. 5 is a perspective view showing a method of manufacturing a magnetic head of the present invention.

FIG. 6 is a perspective view showing a method of manufacturing a magnetic head of the present invention.

FIG. 7 is a perspective view showing a method of manufacturing a magnetic head of the present invention.

FIG. 8 is a perspective view showing the method of manufacturing the magnetic head of the present invention.

FIG. 9 is a perspective view showing the method of manufacturing the magnetic head of the present invention.

FIG. 10 is a perspective view showing the method of manufacturing the magnetic head of the present invention.

FIG. 11 is a perspective view showing the appearance of a conventional magnetic head.

FIG. 12 is a diagram showing a medium sliding contact surface of a conventional magnetic head.

[Explanation of sign]

 1a 1st core half body 1b 2nd core half body 8 Winding groove 10 Magnetic gap 72 Glass filling groove 91 Crystallized glass

Claims (2)

[Claims] 1. A magnetic head in which a first core half body and a second core half body are gap-bonded via a gap spacer which serves as a magnetic gap, wherein at least one of the first and second core half bodies has a gap. A magnetic head, characterized in that a groove formed on the surface on the forming side is filled with crystallized glass, and the first and second core halves are gap-joined by vitreous material exuding from the crystallized glass. 2. A magnetic head according to claim 1, wherein the crystallized glass is exuded from the crystallized glass by heating the crystallized glass to a deformation point temperature.