JPH0397109A - Magnetic head - Google Patents

Abstract

PURPOSE:To allow the formation of a gap with high reliability by butting a pair of core blocks consisting of a magnetic material against each other and joining the core blocks with nonmagnetic films contg. at least one kind of Cu, Au and Ag or the alloy thereof. CONSTITUTION:The nonmagnetic films 3 constituted of the 1st layer film 3A consisting of Al2O3 or SiO2 and the 2nd layer film 3B consisting of at least one kind of the Cu, Au and Ag or the alloy thereof are formed on the gap forming surfaces of a pair of the core blocks 1A, 1B. The core blocks are butted against each other with a groove 4 for a winding window positioned on an inner side and are heated and compression bonded at the temp. below the m. p. of the 2nd layer film 3B. The core blocks are thus joined by the self-fusion of the 2nd layer film 3B. The 1st layer film 3A prevents the diffusion of the material of the 2nd layer film 3B to the core blicks 1A, 1B. The 2nd layer film 3B is the metal which is nonmagnetic and has small activation energy, and the film is thus easily diffusible and makes self-fixing. The exact gap length is thus obtd. and the gap is formed with the high reliability.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is particularly applicable to information recording and reproducing devices that require high-density magnetic recording, such as video table recorders (VTRs), digital audio table recorders (DATs), and floppy disk devices. The present invention relates to the magnetic head used, and particularly to the design of the working gap to have an accurate gap length and improve reliability.

? Prior Art] The magnetic head used in this type of information recording and reproducing device is
As shown in Fig. 2 (A) to (E), a pair of core blocks IA and IB made of magnetic materials such as oxide magnetic material represented by ferrite and metal magnetic material represented by sendust are butted together. , the main body is a magnetic core with an operating gap 2 formed on its abutting surfaces.

The working gap 2 is provided in the core blocks IA and IB and is
L2 0. Alternatively, the non-magnetic film 3 such as SiO2 may be used. In addition, the core block IA is provided with a winding window groove 4, and abutting surfaces (
A silver wax film 5 is formed in the back gap.

[
Figure 2 (C)]. Thereafter, the magnetic core is sliced to a predetermined thickness to obtain a head chip [FIG. 2(D)].

The sliced head chip is R-polished by a cylindrical polishing method or the like in order to provide a shaped tape sliding surface on the side of the working gap 2, and then the entire tape sliding surface is wrapped into a predetermined shape by tape wrapping. Finished in.

Here, R-polishing is a process in which a grinding wheel with fine grains of, for example, 1,000-12,000 grains is rotated, and the head processing part is brought into contact with the end face of the grinding wheel while swinging up and down, and grinding is performed. This is a process in which a wrapping tape (a tape with a 1000-8000 grindstone attached to a Mylar base) is run, and the front surface of the head is mechanically moved up and down and oscillated.

In this way, the magnetic core is subjected to R polishing and tape lapping, and the processing of the front surface of the head is completed, and the magnetic head is fully used.

[Problem to be solved by the invention]

Conventional magnetic heads are constructed as described above, and the pair of core blocks are bonded together using silver solder in the pack gap, so the gap may open during processing such as slicing, or the operating gap This had the disadvantage that the track of the track may be misaligned.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in conventional magnetic heads, it is an object of the present invention to provide a magnetic head that can perform a highly reliable gap formation when joining a pair of core blocks.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a magnetic head equipped with a magnetic core in which a pair of core blocks made of magnetic materials are butted together to form an operating gap through a non-magnetic film, the non-magnetic film being The gist is that the working gap is formed by containing at least one of Cu, Au, and Ag or an alloy thereof.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on FIGS. 1(A) to 1(E).

FIG. 1(E) shows the structure of a magnetic head showing an embodiment of the present invention, which has the same basic structure as the conventional magnetic head shown in FIG. 2(E), but with an operating gap of 2. The nonmagnetic film 3 containing at least one of Cu, Au, and Ag or an alloy thereof is self-fused to join the core blocks IA and IB.

A self-bonding non-magnetic film is formed in both the working gap 2 and the pack gap.

Figure 1. (A) to (D) show the basic steps for obtaining the magnetic head according to the present invention, which include the following steps. That is, core blocks IA and IB made of magnetic materials such as oxides and metal magnetic materials are prepared, and one core block IA is provided with a winding window groove 4. The gap shapes or surfaces of the working gap 2 and the pack gap are mirror polished (FIG. 1A).

A non-magnetic film 3 is coated on the gap forming surfaces of the pair of core blocks IA and IB. It is formed with a thickness of 1 μm [Fig. 1 (B
)]. This non-magnetic film 3 is made of AI! 03 or Sin. The second layer 3B is made of at least one of Cu, Au, and Ag or an alloy thereof. The thickness ratio of the first layer film 3A and the second layer film 3B is 7:3
is being done. When the first layer film 3A is self-fused with the second layer film 3B, the material of the second layer film 3B is mixed with the core blocks IA, IB.
It has the effect of preventing the diffusion of

The second layer film 3B is a metal that is nonmagnetic and has low activation energy, and is easily diffused.

A pair of core blocks IA and 1B in which the nonmagnetic films 3 of the first layer film 3A and the second layer film 3B are formed are butted against each other with the winding window groove 4 inside, and a magnetic core having an operating gap 2 is formed. becomes. The matched core blocks IA and IB are
The temperature below the melting point of the layer 3B (for example, 108
The core blocks IA and IB are bonded together by self-fusion by the second layer film 3B (FIG. 1(C)).

The joined core blocks IA, IB are sliced to a predetermined thickness [FIG. 1(D)], and the head chip shown in FIG. 1(E) is obtained.

Then, the operating gap 2 is formed, and the front surface of the head, which becomes the tape sliding surface, is subjected to R polishing and tape lapping.
The magnetic head was completely destroyed.

FIG. 3 is a perspective view and a plan view of a magnetic head.

LA, IB...Core block, 2...Working gap, 3...Nonmagnetic film, 3A...First layer film, 3B...
Second layer film, 4... Groove for winding window.

[Effects of the Invention] As explained above, the present invention is self-fixed by the non-magnetic film that forms the working gap, so the working gap does not open during manufacturing and the trunk does not shift, and self-fixing is achieved. Since this is done by solid phase bonding, the accurate gap length is determined by the sum of the thicknesses of the first and second layers that form the non-magnetic film, making it possible to form a highly reliable gap. I can do it.

[Brief explanation of drawings]

FIGS. 1(A) to (E) are perspective views and plan views showing an embodiment of the present invention including the manufacturing process;

Claims (1)

[Claims] A magnetic head comprising a magnetic core in which a pair of core blocks made of magnetic materials are butted together to form an operating gap with a non-magnetic film interposed therebetween, wherein the non-magnetic film is made of at least one of Cu, Au, Ag, or A magnetic head comprising the alloy and forming the working gap.