JPH0254407A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To improve workability by removing the glass affinity material on the surfaces intended to be formed with a magnetic gap, then butting respective core blocks against each other and welding the blacks by glass, thereby forming a core chip. CONSTITUTION:Plural track grooves 13, 13... each having a V-shaped section are worked longitudinally at a fixed pitch on the inner side surface of a pair of the core blocks 12 consisting of ferrite and having a rectangular parallelepiped shape and a winding groove 17 is worked thereto as well. A thin metallic film 14 is formed by sputtering of 'SENDUST(R)' on the inner side surfaces of the blocks 12 and the glass affinity material 15 of Cr, Ti, etc., consisting of the metals included in groups IVa-IVa is deposited over the entire surface of the thin film 14 and the surface thereof is worked to a specular surface. The glass affinity material 15 on the surface G intended to be formed with the magnetic gap is removed. A gap spacer such as SiO2 is deposited on the surface G intended to be formed with the magnetic gap of the one core block 12 and the two blocks 12 are butted against each other. A low melting glass rod 16 is put into the winding groove and is heated to weld the blocks. The center in the lower part of the blocks 12 is cut away and further, the blocks 12 are sliced at a fixed pitch by which the core chip 5a is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic head, and more particularly to a method of butting and joining together a pair of core blocks in manufacturing a magnetic head.

[Conventional technology]

For example, the magnetic heads used in FDDs and 8 tm VTRs are MIG (M
etal in Gap) There is something called Heid.

As shown in FIGS. 9 to 11, this MIG head (1) has a pair of magnetic cores (2) made of ferrite, which is a ferromagnetic material, and a pair of magnetic cores (2) made of a high saturation magnetic flux density metal ferromagnetic material. The core chip (
5), and a magnetic gap g having a predetermined track width T is formed between the metal thin films (3) (3). This magnetic gap g is viewed from both sides of the above-mentioned low melting point glass (4) (
4) is protected. Wires (6) (6) such as Cu are wound around each magnetic core (2) (2) of the core chip (5) to form a coil, and a ferromagnetic material is attached to the lower part of the magnetic core (2) (2). The back core (7
) is pasted and fixed across the magnetic cores (2) (2) to form a closed magnetic path.

The MTG head (1) is manufactured through the steps shown in FIGS. 14 to 17.

First, as shown in FIG. 14, a pair of substantially rectangular parallelepiped core blocks (8) (8
). Next, as shown in FIG. 15, a plurality of track grooves (9) (9)... (9) (9)... are left on the inner surface of the core blocks (8) (8) with a predetermined track width T.
・Cutting at a fixed pitch. And the core block (8
) A thin metal film (10) is formed by sputtering Sendust, a metal ferromagnetic material with high saturation magnetic flux density, on the inner surface of (8).
(10) is deposited and formed. Thereafter, as shown in FIG. 11, the core blocks (8) (8) are glass molded and each track groove (9) (9)...(9)(9)...
Low melting point glass (11) (11)...(11)
(11)... is filled, and the core block (8)
After polishing the inner surface of (8), a non-magnetic thin film such as Sing, which is not shown, is deposited to serve as a gap spacer. Next, as shown in Fig. 17, the winding groove (17) is cut, and then the core block (8) is cut as shown in Fig. 17.
) (8) and heat it to form the low melting point glass (11).
) (11)... to join and integrate. In addition, after cutting and removing the lower center of the core blocks (8) (8), the core blocks (8) (8) are arranged at a fixed pitch with dashed dot lines P, P,
The core chip (
5) is obtained.

[Problem to be solved by the invention]

By the way, in the above-described magnetic head manufacturing method, when manufacturing the core chip (5), the core block (8) (8
) The metal thin film (10) (
After forming the low melting point glass (11) (
11) When filling the core block (8) (
Since the core blocks (8) are heat treated when they are butted together and heated and welded, the number of heating cycles is large and the
) (8) are easily susceptible to thermal damage. In particular, metal thin films (
10) was thin and easily peeled off, which caused deterioration of magnetic properties.

[Means for Solving the Problems] The present invention involves cutting track grooves in the planned magnetic gap forming portions of a pair of core blocks made of a ferromagnetic material, and forming track grooves on the inner surface thereof made of a high saturation magnetic flux density metal ferromagnetic material. A step of depositing and forming a metal thin film, and a step of depositing a first Va-V on the metal thin film.
A process of depositing and mirror-finishing a glass-compatible material made of a metal in group IA, removing the glass-compatible material on the surface where the magnetic gap is to be formed, and butting each core block to face the surface where the magnetic gap is to be formed. The present invention is characterized in that it also includes a step of inserting a glass rod into the winding groove and heating it, and joining each core block together by glass welding to form a magnetic gap.

[Effect]

According to the above technical means, a metal thin film is deposited on the track grooves formed in the pair of core blocks, and the first V
a xVI After applying a glass-compatible material made of a metal in group a and removing the glass-compatible material on the surface where the magnetic gap is to be formed, each core block is butted together and glass-welded, and the core chip is formed by one heat treatment. Manufacture.

〔Example〕

An embodiment in which the method of the present invention is applied to a MIG head used in an FDD device will be described below with reference to FIGS. 1 to 8.

First, as shown in Fig. 4, a pair of core blocks (12) in a substantially rectangular parallelepiped shape made of ferrite, which is a ferromagnetic material.
Prepare (12). Next, as shown in FIGS. 5 and 1, a plurality of track grooves (13) having a V-shaped cross section are formed on the inner surface of the core block (12).
(13)...(13) (13)... is cut at a fixed pitch along its longitudinal direction, and the winding groove (17)
Cutting. And the above core block (12)
(12) by sputtering Sendust, a metal ferromagnetic material with high saturation magnetic flux density, on the inner surface of the metal 111! J(1
4) Next, as shown in FIG. 6 and FIG. Compatible materials (15) (15), such as Cr, Ti,
After selecting and depositing Ta, etc., the deposited surface is polished to a mirror finish, and as shown in FIGS. 7 and 3, a glass-compatible material (15 )(15
) to remove. At this time, conventionally, the track groove (9) was filled with low melting point glass (11) and the glass surface was polished, which made the glass (11) hard and difficult to polish.However, with the method of the present invention, For example, the glass-compatible material (15) may be thinly deposited on the metal thin film (14) of the track groove (13), and can be easily polished. Then, Si is placed on the magnetic gap formation planned surface (G) of one core block (12).
Gap spacers (not shown) such as n, etc. are deposited by sputtering or the like. Thereafter, as shown in FIG. 8, the core blocks (12) (12) are butted together with their magnetic gap forming surfaces (G) facing each other, and low melting point glass rods (16) (16) are inserted into the winding grooves. ... are inserted and heated, and each core block (12) (12) is joined and integrated by glass welding to form a magnetic gear. Further, the lower center of the core block (12) (12) is cut off and the core block (12) (12) is sliced at regular pitches to obtain a core chip (5a) shown in FIG.

In the above embodiment, a trapezoidal MIG head has been described, but the present invention can also be applied to a TSS type MIG head shown in FIG. 12 or an X type MIG head shown in FIG. 13.

〔Effect of the invention〕

According to the present invention, a metal thin film is deposited on the track grooves formed on a pair of core blocks, a glass-compatible material is deposited thereon, and after removing the glass-compatible material on the surface where the magnetic gap is to be formed, each Since the core blocks are butted together and glass welded to form the core chip, heat treatment is only required once, which simplifies the process and improves workability.It also reduces thermal damage to the core block and increases its strength. The magnetic metal thin film no longer peels off, improving magnetic properties.

[Brief explanation of the drawing]

1 to 8 are for explaining an embodiment in which the method of the present invention is applied to an MIG head for FDD, and FIGS. 1 to 3 are enlarged sectional views of each main part showing the core block, 4 to 8 are perspective views showing the core block, FIG. 9 is a perspective view showing the specific structure of the MIG head, FIG. 10 is a front view of FIG. 9, and FIG. 11 is a diagram showing the structure of the present invention. FIG. 12 is a plan view of a trapezoidal MIG head that is a second embodiment of the present invention, and FIG.
FIG. 3 is a plan view of an X-type MIG head according to a third embodiment of the present invention, and FIGS. 14 to 18 are for explaining a conventional method of manufacturing a magnetic head. (12)---Core block, (14)---One metal thin film, (16)---Glass rod,

Claims (1)

[Claims] (1) cutting track grooves in the planned magnetic gap formation portions of a pair of core blocks made of ferromagnetic material, and depositing a metal thin film made of high saturation magnetic flux density metal ferromagnetic material on the inner surface; A process of depositing and mirror-finishing a glass-compatible material made of a metal in groups IVa to VIa on the metal thin film, removing the glass-compatible material on the surface where a magnetic gap is to be formed, and forming each core block with a magnetic gap. A magnetic device characterized by comprising the steps of butting the core blocks facing each other with a scheduled surface, inserting a glass rod into the winding groove and heating it, and joining each core block together by glass welding to form a magnetic gap. Head manufacturing method.