JPS62120611A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain the sufficient strength of junction even if a pair of core semibodies are jointed with each other at a low temperature by forming thin metallic films on one side of a through hole for winding which is formed on the junction part of a pair of core semibodies consisting of a magnetic substance and integrally joining the junction part with a joining substance having a melting point lower than that of joining glass through the thin metallic films. CONSTITUTION:The through hole 11 is formed on the junction part of a pair of core semibodies 4, 5 consisting of the magnetic substance and the thin metallic films 13, 14 are formed on one side of the winding through hole 11 connected to the joint part to prepare a magnetic core formed by integrally joining a pair of core semibodies 4, 5 by the joining substance 15 having the melting point lower than that of the joining glass through the thin metallic films 13, 14. Reinforcing grooves 16, 17 are respectively formed on the core semibodies 4, 5 to increase the strength of junction, thin metallic films 18, 19 are formed also in the grooves 16, 17 similarly to the grooves 2, 12 and the thin metallic films 18, 19 are joined also by the joining substance at the time of junction. Consequently, the strength of junction can be increased by reinforcing the junction as compared to the junction based on only the thin metallic films 13, 14.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a magnetic head.

(Prior Art) Conventionally, magnetic heads are made of Mn-Z as shown in FIG. 2(A).
A vortex 2 serving as a winding window is formed in the soft magnetic material 1 of the n-ferry 1 to the shade, and the negative side surface is mirror-finished to form a sliding surface 3 to form a core half 4.

The core half 4 is joined to a core half 5 formed in the same manner as the core half 4 through a gap 6 using a joining material such as glass, as shown in FIG. 2(B), and this core half is assembled. 2 (C
) was clamped as shown.

(Problem to be solved by the invention) However, since the glass used for bonding has a high melting point, it is necessary to combine the glass for bonding with a fly l-
It was necessary to adjust the layout to match the coefficient of thermal expansion.

Therefore, it is not easy to obtain glass that meets the conditions for bonding glass, and since glass with acceptable characteristics after actually being bonded was used as bonding glass, production efficiency was low. In addition, since the bonding temperature is high, it is necessary to control the temperature with a predetermined temperature gradient in order to raise or lower the temperature in the electric furnace, and a lot of time is required for heating and cooling IJI. Therefore, there was a problem in that the cost required for joining was also high.

In addition, in recent years, as shown in FIG. 3, a magnetic core formed by sandwiching an amorphous 8 between soft magnetic materials 1 such as ferrite, forming the gap part with glass 9, and bonding using an adhesive 10 has been developed. There is a magnetic head.

Because amorphous 8 cannot be processed at high temperatures (
Generally, it is desirable to process at a temperature of 500'C or less), and when bonding a magnetic head constructed using amorphous 8, it is necessary to use a glass with a low melting point.

However, low melting point glass is very difficult to obtain, and even if
Even if a glass satisfying these characteristics could be obtained, there was a problem in that almost none of it could withstand use in terms of thermal expansion and strength.

Therefore, in the present invention, a metal thin film is formed on one side of the through hole connected to the joint part of the core halves, and a joining material having a melting point sufficiently lower than that of the joining material such as glass is used to connect the core halves to each other through the metal thin film. By integrally joining the bodies, sufficient strength can be obtained even when joined at low temperatures, and reliability is improved by preventing property deterioration and cracking due to thermal expansion. It is an object of the present invention to provide a magnetic head capable of improving production efficiency by 1-1 loss.

(Means for Solving the Problems) The present invention provides a magnetic head having a configuration as shown in FIG. 1 in order to solve the above-mentioned problems. The magnetic head shown in Fig. 1 has a through hole 1 at the joint of a pair of core halves 4.5 made of magnetic material.
1 and a through hole 1 for the winding connected to the joint part.
A metal thin film 13 , 14 is formed on one side of the metal thin film 13 .
．． A pair of core halves 4 and 5 are integrally bonded to each other by a bonding material 15 having a melting point lower than that of bonding glass via a magnetic core.

(Embodiment of the Invention) FIG. 1 is a diagram showing an embodiment of a magnetic head according to the present invention.

In FIG. 1, the same parts as in FIG. 2 are given the same reference numerals, and their explanation will be omitted.

Grooves 2 and 12 are formed in the core halves 4 so as to form through holes 11 for winding when the core halves 4.5 are joined through the gap 6.
．． A metal, for example,
Metal thin film such as copper (CU) and nickel (Ni) with good solder wettability13. i4 is created using a vacuum film forming method, a sputtering method, or the like.

Note that the adhesion of the metal thin film 13.14 is better when the metal thin film 13.14 is formed using a sputtering method, and the adhesion of the metal thin film 13.14 is better when the substrate is heated to 100'C or higher when forming the metal thin film 13.14. Good results are obtained.

The thickness of the gold B thin film 13.1/I should be such that the metal thin film 13.1/I will not be destroyed by melting of the bonding material during bonding in the next step, for example, copper (Cu). In the case of... 1 to 10 μm In the case of gold (Au)... After forming a thin metal film with a thickness of about 0.6 μm, the core halves 4° 5 are opposed to each other so as to form a gap 6, Then, a bonding substance 15 such as solder or paste is placed on the thin metal Fu 13 and 14, and the bonding substance 15 is melted by placing it in a hot plate or a hot plate, and then held for about 10 seconds. .14, a magnetic core is formed in which the core halves 4.5 are integrally joined via the metal thin film 13.14.

In addition, in order to further increase the joint strength, reinforcing grooves 16.17 are formed in each of the core halves 4 and 5 as shown in FIG. Metal thin films 18 and 19 are formed, and metal λ9I is formed during bonding.
Membranes 18 , 19 are also bonded using bonding material 15 . The strength of the joint can be increased by reinforcing the strength of the joint compared to the joint of thin metal films 13 and 14.

In addition, conventionally, when bonding amorphous materials, a resin that can be bonded at low humidity was used as a bonding material, resulting in poor reliability.
．． 12, it is possible to bond at a relatively low temperature of about 200 to 300"C, and when bonding a head core made of heat-sensitive amorphous, etc., it is possible to use resin or There is no need to use adhesive for bonding, and reliability is improved compared to conventional methods.

(Effects of the Invention) Since the present invention has the above-described configuration, sufficient strength can be obtained even when the core halves are joined at low temperatures, and property deterioration and cracking due to thermal expansion etc. can be prevented. This eliminates the advantages of improving reliability, and further reducing the cost required for joining and production efficiency.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the magnetic head according to the present invention;
FIG. 2 is a diagram showing an example of a conventional magnetic head, and FIG. 3 is a diagram showing a conventional magnetic head using amorphous. 1...Magnetic material, 2.12.16.17...Groove, 3.
... Sliding surface, 4, 5... Core half, 6... Gap, 7... Non-magnetic material, 8... Amorphous, 9...
Glass for bonding, 10... Adhesive, 11... Through hole for winding, 13.14.18.19... Metal thin film, 15... Bonding material.

Claims (1)

[Claims] A through hole for the winding wire is formed at the junction of a pair of core halves made of a magnetic material, and a thin metal film is formed on one side of the through hole connected to the joint, and the wire is inserted through the thin metal film. A magnetic head comprising a magnetic core in which the pair of core halves are integrally bonded using a bonding material having a melting point lower than that of bonding glass.