JPH09161216A - Production of magnetic head, and magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability and strength at the joint boundaries between core parts and mask members. SOLUTION: This process for producing the magnetic head comprises forming glass layers 31, 32 respectively by sputtering on the respective joint surfaces of the mask members 21, 22, butting the mask member 21 via the glass layer 31 against the one surface of the core part 10, butting the mask member 22 via the glass layer 32 against the other surface of the core member 10, joining the core part 10 and the glass layers 31, 32 to each other and the mask members 21, 22 and the glass layers 31, 32 to each other respectively by solid phase joining and joining the mask members 21, 22 to the core part 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head for a floppy disk device in which a mask member is bonded to both sides of a core portion, and a magnetic head manufactured by this manufacturing method.

[0002]

2. Description of the Related Art Conventionally, as a magnetic head for a floppy disk device, as shown in FIG. 4, there is a tunnel erase type magnetic head in which a recording / reproducing head portion 11 and an erasing head portion 12 are combined and integrated. . The recording / reproducing head unit 11 has two recording / reproducing cores 13 and 14 joined via a recording / reproducing gap, and the erasing head unit 1
2 has two erasing cores 15 and 16 joined via an erasing gap. Hereinafter, a unit in which the recording / reproducing head unit 11 and the erasing head unit 12 are integrated is referred to as a core unit 10. The magnetic head shown in FIG. 4 further includes mask members 21 and 22 joined to both sides of the core portion 10.

A conventional method of joining the mask members 21 and 22 to both sides of the core portion 10 will be described with reference to FIG. In the following description, the case where the mask member 21 is bonded to the core portion 10 will be described, but the same applies to the case of the mask member 22. In the conventional method, first,
As shown in FIG. 5A, the plate-shaped low melting point glass 13 is formed on the bonding surface 21 a of the mask member 21 bonded to the core portion 10.
0, and then, as shown in FIG.
The glass 130 is heated at a temperature of 600 ° C., and the glass 130 is welded to the bonding surface 21 a of the mask member 21. next,
As shown in FIG. 5C, the surface of the glass 130 is polished and mirror-polished, and the glass layer 131 having a thickness of 30 to 50 μm is formed.
To form Then, the glass layer 131 is butted against the core portion 10 and heated to fuse the glass layer 131 to the core portion 10 to bond the mask member 21 to the core portion 10.

[0004]

However, in the conventional bonding method as described above, the reliability of the bonding interface is low due to the bubbles generated during glass welding and the variation in the thickness of the glass layer due to processing, In addition, there is a problem in that the strength of the bonding interface varies and cracks occur in the core portion 10 and the mask members 21 and 22 from the bonding interface. Further, due to this problem, the reliability and yield of the magnetic head are low.

The present invention has been made in view of the above problems, and an object thereof is to improve the reliability and strength of the bonding interface between the core portion and the mask member, and to improve the reliability and yield of the magnetic head. Another object of the present invention is to provide a method of manufacturing a magnetic head and a magnetic head which are capable of performing the above.

[0006]

A method of manufacturing a magnetic head according to claim 1, wherein a mask member is bonded to both sides of a core portion having at least one of a recording / reproducing core and an erasing core. In the method, a glass layer is formed by sputtering on at least one of the joint surfaces of the core portion and the mask member to be joined to each other, the core portion and the mask member are abutted through the glass layer, and a predetermined temperature is applied while applying pressure. The solid phase joining is performed between the core portion and the glass layer and between the mask member and the glass layer to join the mask members to both sides of the core portion.

According to a second aspect of the present invention, there is provided a magnetic head in which a mask member is bonded to both sides of a core portion having at least one of a recording / reproducing core and an erasing core. A glass layer is formed therebetween, and the core portion and the glass layer and the mask member and the glass layer are joined by solid-phase joining, respectively.

In the method of manufacturing a magnetic head according to claim 1 or in the magnetic head according to claim 2, a glass layer is formed between the core portion and the mask member, and between the core portion and the glass layer and between the mask member and the mask member. Since the glass layer and the glass layer are bonded to each other by solid phase bonding, reliability and strength of the bonding interface between the core portion and the mask member are improved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The magnetic head according to the present embodiment is a tunnel erase type magnetic head for a floppy disk device. As shown in FIG. 4, this magnetic head has a recording / reproducing head portion 11 and an erasing head. The mask members 21 and 22 are joined to both sides of the core portion 10 that is integrally combined with the portion 12. The recording / reproducing head portion 11 has two recording / reproducing cores 13 and 14 joined via a recording / reproducing gap, and the erasing head portion 12 has two erasing portions joined to each other via an erasing gap. Cores 15 and 16
have. The mask members 21 and 22 are made of a non-magnetic material such as calcium titanate. In the magnetic head according to the present embodiment, the core portion 10 and the mask member 2
A glass layer is formed between the core portion 10 and the glass layer and between the mask member 21 and 22 and the glass layer, respectively, by solid phase bonding (bonding by diffusion of ions into the solid). ) Is joined by.

Next, a method of manufacturing the magnetic head according to the present embodiment will be described with reference to FIGS.
First, as shown in FIG. 1, the bonding surface 21a of the mask member 21 bonded to the core portion 10 is polished and mirror-finished. Next, as shown in FIG. 2, low-melting-point glass is sputtered on the polished joint surface 21a by a sputter device to give 5-2.
A glass layer 31 having a thickness of 0 μm is formed. Although not shown, the glass layer 32 (shown in FIG. 3) is similarly formed on the bonding surface of the mask member 22 bonded to the core portion 10.

The composition of the low melting point glass forming the glass layers 31 and 32 is as follows, for example. PbO ... 70 to 85 wt% B ₂ O ₃ ... 5~15 wt% SiO ₂ ... 2 to 10 wt% Al ₂ O ₃ ... 2~10 wt% ZnO .... 2 to 5 wt% Cu ₂ O ... 0.5~ 3% by weight

The characteristics of the glass having the above composition are as follows. Melting point (Tm) ... 450 to 550 ° C. Transition point (Tg) ... 350 to 400 ° C. Thermal expansion coefficient (30 to 300 ° C.) 90 to 105 × 10 ⁻⁷ / ° C. Thermal expansion coefficient (30 to Tg) 95 to 110 × 10 ^-7 / ℃

Next, as shown in FIG. 3, the mask member 21 is butted against one surface of the core portion 10 via the glass layer 31, and the other surface of the core portion 10 is masked via the glass layer 32. The members 22 are abutted against each other, and these members are set in a dedicated jig 40, and a predetermined temperature, for example, 4
By heating at a temperature of 30 to 520 ° C., solid-phase bonding is performed between the core portion 10 and the glass layers 31 and 32 and between the mask members 21 and 22 and the glass layers 31 and 32, respectively, and the core portion 10 The mask members 21 and 22 are joined to both sides. In addition,
A batch furnace or a tunnel furnace, for example, can be used as a heating method in the case of performing solid-phase bonding, N ₂ is used as an atmosphere for heating, and a heating time is about 10 to 30 minutes.

Dedicated jig 4 for performing the above-mentioned solid phase bonding
0 is the mask member 22, the core portion 10 and the mask member 2 between the U-shaped frame body 41 having two facing side portions 41a and 41b and the inner wall of the one side portion 41a of the frame body 41.
Holding block 42 for sandwiching 1 and the other side portion 41
It is screwed into b from the outside, and the pressing block 4 is held at its tip.
And a tightening screw 43 for pressing 2. When performing the above-mentioned solid phase bonding, as shown in FIG.
The mask member 22, the core portion 10, and the mask member 21 are provided between the inner wall of the one side portion 41 a and the pressing block 42.
Pinch and tighten the tightening screw 43, for example 0.4
A compressive force of up to 1.0 kg is applied to the mask member 22 and the core portion 10.
And the mask member 21. In this state, for example, 4
When heated at a temperature of 30 to 520 ° C., the mask member 22,
Due to the expansion of the core portion 10 and the mask member 21, a compressive force of 1.0 to 2.0 ton weight is applied to them, and solid-phase bonding is performed in a state of being pressurized by this compressive force.

As described above, according to the method of manufacturing the magnetic head and the magnetic head according to the present embodiment, the glass layers 31 and 32 are formed by sputtering between the core portion 10 and the mask members 21 and 22, respectively, and the cores are formed. Part 10 and glass layer 3
1 and 32 and the mask members 21 and 22 and the glass layers 31 and 32 are bonded by solid-phase bonding, respectively, so that the reliability of the bonding interface between the core portion 10 and the mask members 21 and 22 and Strength is improved, and the glass layer 3
Variations in thickness of 1 and 32 are reduced. In addition, the strength of the bonding interface is improved and the variation in the thickness of the glass layers 31 and 32 is reduced, so that the occurrence of crack defects in the core portion 10 and the mask members 21 and 22 is reduced. As a result, the yield of the magnetic head is improved, and the manufacturing cost of the magnetic head can be reduced.

The present invention is not limited to the above embodiment, and for example, in the above embodiment, the mask members 21, 2 are used.
Although the glass layers 31 and 32 are formed on each of the joint surfaces of No. 2 by sputtering, the glass layer 31 may be formed on at least one of the joint surface of the mask member 21 and the joint surface of the core portion 10 on the mask member 21 side. The glass layer 32 is the mask member 22.
It may be formed on at least one of the bonding surface of the core member 10 and the bonding surface of the core portion 10 on the mask member 22 side.

The thicknesses of the glass layers 31 and 32, the composition of the glass forming the glass layers 31 and 32, the conditions for performing solid phase bonding, and the like are given as examples, and It is not limited to this.

[0019]

As described above, according to the magnetic head manufacturing method of the first aspect or the magnetic head of the second aspect, the glass layer is formed between the core portion and the mask member, and Since the glass layer and the mask member and the glass layer are bonded by solid phase bonding, respectively,
The reliability and strength of the bonding interface between the core part and the mask member are improved, the thickness variation of the glass layer is reduced, and the occurrence of defective cracks in the core part and the mask member is reduced. This has the effect of improving the head yield.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a method of manufacturing a magnetic head according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a method of manufacturing the magnetic head according to the embodiment of the invention.

FIG. 3 is an explanatory diagram illustrating a method of manufacturing the magnetic head according to the embodiment of the invention.

FIG. 4 is a perspective view showing a magnetic head formed by joining mask members to both sides of a core portion.

FIG. 5 is an explanatory diagram for explaining a conventional method of joining mask members to both sides of a core portion.

[Explanation of symbols]

 10 core part 11 recording / reproducing head part 12 erasing head part 13, 14, 16, 16 core 31, 32 glass layer 40 jig

Claims (2)

[Claims] 1. A method of manufacturing a magnetic head, wherein a mask member is bonded to both sides of a core part having at least one of a recording / reproducing core and an erasing core, wherein each of the core part and the mask member is bonded to each other. A glass layer is formed on at least one of the bonding surfaces by sputtering, the core portion and the mask member are butted against each other via the glass layer, and under pressure at a predetermined temperature while pressing, between the core portion and the glass layer and between the mask member and the glass member. A method of manufacturing a magnetic head, characterized in that solid-phase bonding is performed between the layers and mask members are bonded to both sides of the core portion. 2. A magnetic head comprising a mask member bonded to both sides of a core portion having at least one of a recording / reproducing core and an erasing core, wherein a glass layer is formed between the core portion and the mask member. The magnetic head is characterized in that the core portion and the glass layer and the mask member and the glass layer are joined by solid phase joining, respectively.