JPH0252325B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention heats a magnetic block in a vacuum atmosphere to near the softening point of the material filled in its grooves, and then returns it to atmospheric pressure in an inert gas atmosphere.
By heating above the melting point of the filling material and joining the two magnetic blocks to form a gap,
This invention relates to a method for manufacturing heads with high yield.

In general, magnetic heads that are required to perform high-density recording tend to have increasingly smaller track widths, and a track width of 20 .mu.m to 60 .mu.m and a gap length of 0.3 .mu.m are desired. One of the conventional gap forming methods is shown in FIGS. 1a, b, and c. FIGS. 1a and 1b show half head core blocks before joining, and FIG. 1c shows the state at the time of joining.

In the figure, 1a and 1b are head core block halves made of magnetic material such as ferrite, and as shown in FIGS.
Grooves 10a and 10b are formed on both sides of a and 2b so that they have a desired track width, and these grooves are filled with a highly wear-resistant non-magnetic material, such as glass 3a and 3b.
is filled. Furthermore, as shown in Figure a, one core block 1a is machined with a winding window 4 and a groove 5 for installing a bonding material, and then a gear spacer 6 made of Ni, Cr, _SiO2 , etc. is formed to the desired thickness. It is vapor-deposited. As shown in FIG.
The core blocks 1a and 1b were joined together to form a gap.

In the conventional method as described above, the gap material glass 7 is required to penetrate into the gap.
In order to make a and 7b low in viscosity, it was necessary to maintain their melting temperature at a fairly high temperature. Therefore, the gap material glasses 7a and 7b and the core block 1
Erosion and mutual diffusion reactions occur between a and 1b, making it difficult to obtain the desired gap length. Also, because the air gap is small, the flow resistance of the glass increases, making it difficult for the glass to spread evenly over the entire air gap, and if one part of the glass reaches the other end earlier than the other part, the other glass will Because glass tends to flow easily through the glass, defective products have been produced, such as gaps where the glass is not filled or windows that are partially clogged.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by remelting the filled glass on at least one of the blocks via a high-melting-point, non-magnetic gear spacer, it is possible to The object of the present invention is to provide a method of manufacturing a magnetic head by joining two core blocks together and manufacturing the head with a high yield.

An embodiment of the present invention will be described below with reference to the drawings. FIGS. 2a and 2b show head core block halves before being joined together in a method of manufacturing a magnetic head according to an embodiment of the present invention, and FIG. 2c shows the state at the time of joining.

According to this invention, as shown in FIGS. 2a and 2b, the head core block half 1 made of magnetic material
Grooves 10a and 10b are machined in grooves 10a and 10b so that the tracks 2a and 2b have a desired track width, respectively, and then the grooves are filled with a non-magnetic material having high wear resistance, such as glass 3a and 3b. Furthermore, as shown in Figure a, one core block 1a is machined with a winding window 4 and a groove 5 for installing a binding material, and the other core block 1b is machined with a winding window 4 and a groove 5 for installing a binding material.
As shown in FIG. 1, a non-magnetic material 8 is formed as a gap spacer to a desired thickness over a portion including the gap facing surface or over the entire abutting surface by a method such as sputtering or vapor deposition. Second
These core block halves 1a shown in figures a and b,
1b is held with the gap-facing surfaces facing each other as shown in FIG. It is placed only in the groove 5, and first heated in a vacuum atmosphere (below 5×10 ^-4 Torr to near the softening point of the filled glasses 3a and 3b, and then heated with an inert gas, e.g., while continuing heating.
By introducing N ₂ gas, the N ₂ atmosphere is returned to the atmospheric pressure, and the heating temperature is finally maintained at the same level as the temperature at the time of filling the groove, and the two core blocks 1a and 1b are firmly joined. Ru. At this time, the gap spacer 8 functions effectively as a gap material in the portions formed in the tracks 2a and 2b of the core blocks 1a and 1b, and acts as a gap material in the portions formed in the filler glasses 3a and 3b by mutual reaction. It melts into the filler glasses 3a and 3b and becomes integrated with them. Furthermore, since the glass is heated in a vacuum to near the softening point of the filled glass, gases stored in the non-magnetic gear spacer and moisture adsorbed in the SiO ₂ spatter film, which cause bubbles in the molded glass, are removed. Since the absorbed gas or moisture is removed by the preheating to a temperature below the softening point of the glass, the filled glass 3a is then held at a high temperature.
3b are melted together, almost no gas is involved, and no defects 9a, 9b due to air bubbles are generated in the filled glass portions 3c, 3d of the tape sliding surface of the final finished head as shown in FIG. By the way, the above-mentioned removal of occluded gas and moisture is more effective when heated in vacuum than in atmospheric pressure. However, if held in a vacuum at a temperature above the softening point of glass, the glass will boil, causing bubbles to form.If the ferrite core material is exposed to a vacuum at higher temperatures, the ferrite will be reduced and its magnetic properties will deteriorate. Before holding the product at high temperatures,
It is necessary to return the pressure from a vacuum atmosphere to atmospheric pressure in an inert gas atmosphere. Therefore, according to the present invention, there is no need to maintain the melting temperature at a very high temperature, there is no problem of conventional erosion or interdiffusion reaction, and there is no occurrence of defects due to air bubbles in the filled glass portion, which prevents window clogging. Therefore, heads can be manufactured with high yield.

Other embodiments of the invention are shown in FIGS. 4a, b, and c. In the furnaces shown in Figures a and b, grooves 10a and 10b are machined in the head core block halves 1c and 1d, respectively, over the entire length of the block so that the tracks 2a and 2b have a predetermined track width, and then wear resistance is achieved. non-magnetic materials, such as glass 3a, 3
The one filled with b is shown. Further, in the head core block half 1c shown in Figure a, a winding window 4 is processed, and in the head core block half 1d shown in Figure b, a gear spacer 8 is deposited to a desired thickness over the entire surface. These head core block halves 1c and 1d are held together as shown in Figure c, and are first heated in a vacuum atmosphere (5×
The two core blocks 1c and 1d are joined together by heating at a temperature of 10 ^-4 Torr or less), then returning to atmospheric pressure using an N ₂ atmosphere, and finally maintaining the heating temperature at the temperature at which the filled glass was filled. can do. In this case, the bonding material 7b shown in FIG. 2 is not necessary.

As described above, according to the present invention, since the filled glass is melted again through the gap spacer, the desired gap can be easily obtained.
Furthermore, there is no loss of filling material due to air bubbles on the tape sliding surface, and there is no clogging of the winding window, making it possible to manufacture the head efficiently and with high yield.

[Brief explanation of the drawing]

Figures 1a and b are perspective views showing head core block halves before joining in the conventional gap type, Figure 1c is a perspective view showing the state at the time of joining, and Figures 2a and b are perspective views of the head core block halves of the present invention. In the method for manufacturing a magnetic head according to one embodiment, a perspective view showing the head core block halves before joining in gap formation, FIG. 2c is a perspective view showing the state at the time of joining,
FIG. 3 is a plan view showing a state in which a defect due to air bubbles has occurred in the filler material portion on the tape sliding surface of a head that has undergone final finishing, and FIG. 4 shows a manufacturing method according to another embodiment of the present invention. , a and b are perspective views showing the head core block halves before joining, respectively;
c is a perspective view showing the state at the time of joining. 1a, 1b, 1c, 1d...head core block, 2a, 2b...truck, 10a, 10b...
...Groove, 3a, 3b...Filled glass, 8...Gear spacer. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A groove for regulating track width is formed in at least one of the two magnetic blocks, the groove is filled with a non-magnetic material such as glass having high wear resistance, and a SiO ₂ sputtered film is formed. A gear spacer made of a non-magnetic material having a predetermined thickness is formed on a part or the entire surface of at least one of the magnetic blocks including the gap facing surface, and both of the magnetic blocks are held with their abutting surfaces facing each other, and in this state. Both magnetic blocks are heated in a vacuum atmosphere to near the softening point of the material filling the grooves while maintaining the temperature, and then the atmosphere is returned to atmospheric pressure by filling the atmosphere with an inert gas while continuing to heat. A method for manufacturing a magnetic head, characterized in that the temperature is raised above the melting point of the filling material to join two magnetic blocks to form a gap.