JPH02201715A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To obtain the inexpensive and sure magnetic head by heating magnetic core surfaces up to a prescribed temp. in an oxidative atmosphere to oxide the surfaces, packing glass at the time of packing the glass. CONSTITUTION:The glass 2 for reinforcing or joining is imposed in the track width regulating grooves 6 and glass joining groove 5 of a core half body 4 and is heated up to the prescribed temp. in the oxidative atmosphere; thereafter, gaseous nitrogen is introduced and the glass 2 is held at the working temp. thereof for a prescribed period of time in an inert gaseous atmosphere. The core half body 4 packed with the glass 2 is then subjected to prescribed winding window working, specular polishing, and gap spacer forming, etc. The core half bodies are butted against each other and again the welding with glass is executed, by which a core block 8 is obtd. The core block 8 is subjected to prescribed working, such as cylindrical polishing and slicing to obtain a head chip. The magnetic head having the good performance is obtd. inexpensively with good mass productivity in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is particularly applicable to information recording and reproducing devices that require high-density magnetic recording, such as video tape recorders (VTRs), digital audio tape recorders (DATs), and floppy disks. The present invention relates to a magnetic head, and particularly to a method of manufacturing a magnetic head in which a magnetic core made of a metal magnetic material is filled with glass for reinforcement or bonding.

[Conventional technology]

Magnetic tapes used in information recording and reproducing devices such as VTRs and DATs that require high-density magnetic recording generally use iron oxide-based recording media. Metal-based recording media with high retention strength are becoming popular.

In order to perform sufficient recording on such recording media, a high saturation magnetic flux density is required as the core material of the magnetic head, and instead of the commonly used ferrite, metals with a high saturation magnetic flux density such as Sendust are used. Magnetic materials began to be used.

However, metal magnetic materials such as sendust generally have poor wettability with glass, often causing problems in reinforcement and bonding with glass. Therefore, in conventional magnetic heads, in order to improve the wettability between the metal magnetic material and glass, a base film such as S i 02, which has good wettability with glass, is coated with the metal magnetic material by a thin film forming method such as sputtering or vapor deposition. The method used was to attach glass to the surface and then fill it with glass.

FIG. 6 shows the configuration of a conventional magnetic head.

In FIG. 6, in the conventional magnetic head, a track width regulating groove is formed before joining the core halves 1.1, and a base film 3 such as 5iO7 is formed on the surface of the track width regulating groove. By filling the base film 3 with the glass 2,
It has a structure in which the core half is joined.

[Problem to be solved by the invention]

Since the conventional magnetic head is configured as described above,
The wettability of the core material metal magnetic material and glass is improved,
Although there are fewer problems during filling, there is a drawback that the cost increases because the process of newly forming a base film is increased.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems with conventional magnetic heads, and aims to provide a magnetic head with good performance at a low cost and with good mass productivity.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a magnetic head in which a magnetic core made of a metal magnetic material is filled with reinforcing or bonding glass, in which the magnetic core is filled with glass in an oxidizing atmosphere. a first step of raising the temperature to a predetermined temperature in an inert gas atmosphere to oxidize the surface of the magnetic core; and a second step of raising the temperature to a working temperature of the glass in an inert gas atmosphere and maintaining it to melt and fill the glass. The gist of the present invention is a method of manufacturing a magnetic head comprising the steps of step 2.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In FIGS. 1(a), (b), and (C), a core half 4 made of a metal magnetic material such as sendust is processed with track width regulating grooves 6 and glass bonding grooves 5 (first Figure (a)). Next, the track width regulating groove 6 of the core half body 4,
A glass 2 for reinforcement or bonding is placed in the glass bonding groove 5, heated to 600°C in an oxidizing atmosphere, and then nitrogen gas is introduced to raise the working temperature of the glass 2 in an inert gas atmosphere. (750°C) for 20 minutes (Figure 1 (g))
)). The core halves 4 filled with glass 2 for reinforcement or bonding are then subjected to prescribed winding window processing, mirror polishing, gap spacer formation, etc., and the core halves are butted against each other and glass welding is performed again. By this, Figure 1 (C)
A core block 8 shown in is obtained. Core block 8 is
Thereafter, processing such as predetermined cylindrical polishing and slicing is performed to obtain the head chip 9 shown in FIG.

In this head chip 9, the surface of the magnetic core 1 filled with glass 2 is oxidized, and the half cores 1 are reinforced or bonded to each other by the glass 2 via the oxidized layer.

FIGS. 3(a), 3(b), and 4 show other embodiments of the present invention, which have a different configuration from the magnetic head described above.

First, the core halves 4 are subjected to predetermined winding window processing, mirror polishing, gap spacer formation, etc., and the core halves 4 are butted together and welded with silver solder or the like to obtain the head block 8. This head block 8 is grooved leaving a predetermined track width 7 from the tape sliding surface side (FIG. 3(a)).

A glass material that will become the glass 2 is placed on top of the core block 8, heated to 60°C in an oxidizing atmosphere, and then nitrogen gas is introduced to make the glass 2 work at a temperature of 750°C.
) for 20 minutes (Figure 3(b)). Thereafter, the head block 8 is subjected to predetermined cylindrical polishing, slicing, etc. to obtain a head chip 9 shown in FIG. 4.

Here, the oxidizing atmosphere can generally be carried out in an atmosphere containing oxygen (in the atmosphere), but the oxygen partial pressure is 0.1 to 0.
．． A range of 4 atmospheres is preferred. Furthermore, heat treatment carried out in an oxidizing atmosphere is 65%
A range up to 0°C is preferred.

〔Effect of the invention〕

As explained above, in the present invention, when filling the glass, the temperature is raised to a predetermined temperature in an oxidizing atmosphere to oxidize the surface of the magnetic core and then the glass is filled, resulting in good wettability and no voids. It can completely eliminate the occurrence of cracks, etc., and does not require any process such as attaching a special base film.
An inexpensive and reliable magnetic head can be provided.

[Brief explanation of the drawing]

Figures 1 (a), (b), (C) and 2 are perspective views showing the steps of an embodiment of the present invention, and Figures 3 (a), (b) and 4 are perspective views, respectively, of the present invention. A perspective view, a front view, and a perspective view showing the steps of another embodiment according to the invention; FIG. 5 is a diagram showing the magnetoelectric conversion characteristics of the magnetic head according to the invention; FIG. 6 is a perspective view showing a conventional magnetic head. be. 1...Magnetic core, 2...Glass, 4...Core half-closed, 8...Core block, 9...Head chip. (dB)

Claims (1)

[Claims] In a magnetic head in which a magnetic core made of a metallic magnetic material is filled with glass for reinforcing or bonding, when the glass is filled into the magnetic core, the temperature is raised to a predetermined temperature in an oxidizing atmosphere and the surface of the magnetic core is manufacturing a magnetic head comprising a first step of oxidizing the glass, and a second step of heating and holding the glass to the working temperature in an inert gas atmosphere to melt and fill the glass. Method.