JPH0237511A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To prevent gap length from being extended due to the invasion of dust, etc., in a gap forming part and a joining part by performing unification by forming and butting an island shape nonmagnetic material film at part of the part of a head core mother material except for a track. CONSTITUTION:The nonmagnetic thin film 4 of an SiO2, etc., is covered and formed by sputtering by stucking a mask 3 having a hole corresponding to an island shape nonmagnetic film forming part on the joining plane 2 of the head core mother material 1 on a side desired to apply the groove working of a track groove 8, a V-groove 7, and winding 8, etc. Next, the grooving is applied, and the head core mother material 5 on the other side is butted with the head core mother material 1 on which the island shape nonmagnetic film is formed, and glass 9 for welding is placed on the V-groove and a winding groove, and it is heated and melted, and the glass is embedded in the gap other than the island shape nonmagnetic forming part, then, a magnetic head block can be obtained. The block is sliced at a position of chain line (l), then, a magnetic head chip 10 can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a bulk type magnetic head used in a VTR device, etc.

For example, the conventional method of manufacturing a magnetic head is shown in Figures 4a-e.
The one shown in is common. This will be explained below with reference to the drawings.

First, as shown in FIG. 4a, a pair of rectangular parallelepiped head core base materials 11 and 12 which have been mirror-finished are prepared.

Then, as shown in FIG. 4, one head core base material 11
A V groove 13 is cut along the longitudinal direction on the inner side surface, and a winding locking groove is cut on the outer side surface.

Further, winding locking grooves 15 and grooves 16 are cut on the outer and inner side surfaces of the other head core base material 12 along its longitudinal direction. Next, tracks T, . . . , T, .
A plurality of track grooves 17...17... are formed by cutting at a constant pitch, leaving .

Thereafter, as shown in FIG. 4C, glass 18 and 19 are molded into the track grooves and the grooves, and a non-magnetic thin film 20 such as 5t02, which will become a gap spacer, is placed on the joint surface of the head core base material 11.
is deposited and formed by sputtering.

Then, as shown in Fig. 4d, the head core base material 11.12
The joint surfaces of the two are butted together, and the glass is welded and integrated by heating.

Next, as shown in FIG. 4e, proceed to the above rad core base material 11.
The top end of No. 12 is polished to a curved surface, and further indicated by the dashed line J,
A magnetic head chip is created by slicing it to a predetermined thickness as shown by J.

By the way, in the conventional manufacturing method of magnetic heads, a non-magnetic thin film is sputtered on the entire joint surface of the head core base material.
It is integrated with butted glass.

In this case, there is a high probability that they will be joined and integrated with foreign matter such as dust interposed therein, and this foreign matter will increase the magnetic gap length.

In addition, because the ferrite, which is the material of the head core base material, and the non-magnetic thin film 5i02 are not compatible with each other, the adhesive strength between the head core base material and the non-magnetic thin film at the joint part is low, and the subsequent slicing work etc. There were problems such as gap collapse and cracking due to chipping etc.

The present invention has been proposed in view of the above-mentioned problems, and involves forming track grooves at fixed pitches by leaving a plurality of tracks on the bonding surface of a pair of ferromagnetic core base materials. Then, forming an island-shaped non-magnetic thin film on a part of the bonding surface of at least one of the head core base materials excluding the track by sputtering using a mask, and bonding the head core base materials with abutted glass. The present invention provides a method of manufacturing a magnetic head that solves the above-mentioned problems.

According to the method of the present invention, a non-magnetic thin film is formed in an island shape by masking in the area other than the tracks, and the head core base material is butt-bonded and integrated, thereby reducing the spacing and rear magnetic gap formed between the tracks. Glass is also embedded in the gap, creating a strong bonded body.

Furthermore, when the head core base materials are butted together, the number of parts that come into close contact with each other is very small, so the probability of a long gap occurring due to foreign matter such as dust being trapped can be significantly reduced.

Actual example - Fig. 1 is a perspective view showing the formation of an island-like nonmagnetic thin film on a head core base material, which is an embodiment of the present invention, and Fig. 2 is a perspective view showing the formation of an island-like nonmagnetic thin film on a head core base material, which is an embodiment of the present invention. FIG. 3 is a perspective view of a magnetic head core chip obtained by slicing it.

This will be explained with reference to FIGS. 1 to 3.

Track groove 6. ■ A mask 3 with holes corresponding to the island-shaped non-magnetic thin film forming portion is closely attached to the bonding surface 2 of one of the head core base materials 1 which has been processed with grooves such as 79 winding grooves 8, etc., and by sputtering, A non-magnetic thin film 4 such as 5102 is deposited.

After that, the other head core base material 5 on which groove processing was performed,
The head core base material 1 on which the island-shaped non-magnetic thin film is formed is
As shown in the figure, the welding glass 9 is placed in the groove and the winding groove, and heated and melted in a vacuum or an inert gas atmosphere.
A magnetic head core block is obtained by embedding glass in spaces other than the island-shaped nonmagnetic thin film forming portions.

When the thus obtained magnetic head core block is sliced into predetermined thickness sections along dashed lines J, J, etc. shown in FIG. The magnetic herad tip IcL shown in the figure is obtained.

Above, we have explained the manufacturing method of Magnetic -/D by glass melt pouring. Before forming the island-shaped non-magnetic thin film, glass is molded into the track grooves and grooves, and then the glass is heated by butting. A magnetic head may be manufactured by melting and integrally joining.

As explained above, in the present invention, an island-shaped non-magnetic thin film is formed on a part of the part other than the track, and the butt is integrated, so glass is applied to most of the gap forming part and the joint part. It is possible to provide a strong embedded magnet with a low probability of a long gap occurring due to the entrapment of foreign matter such as dust.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the formation of an island-shaped non-magnetic thin film according to an embodiment of the present invention. FIG. The figure is a perspective view of a magnetic head core chip obtained by slicing a magnetic helix core block, and FIG. 4 is a process explanatory diagram showing a conventional method of manufacturing a magnetic head. 1.5...Head core base material, 2...Joint surface, 3...Mask, 4...Nonmagnetic thin film (Si20), 6...Track groove, 7...V groove, 8 ...Winding groove, 9...Glass,

Claims (1)

[Claims] Track grooves are formed at a constant pitch by leaving multiple tracks on the bonding surface of a pair of head core base materials made of ferromagnetic material.
Forming an island-shaped non-magnetic thin film on a part of the joint surface of at least one of the head core base materials excluding the track, and butting the head core base materials and joining the parts other than the part where the non-magnetic thin film is formed with glass. A method for manufacturing a magnetic head characterized by: