JPH02235209A - Production of magnetic head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a magnetic head, and in particular, to a method for manufacturing a magnetic head, in particular, the present invention relates to a method for manufacturing a magnetic head. This relates to a method of melting and filling glass.

[Successful technology]

FIG. 6 shows a block perspective view of a magnetic head obtained by the conventional magnetic head manufacturing method disclosed in, for example, Japanese Patent Publication No. 63-5802.
b) are respectively core blocks made of ferrite etc.
2》 is a glass groove that serves as a glass fixing, 《3》 is a narrow track width regulating groove for determining the track width, and (5) is a narrow track width regulating groove in the above glass groove (2) and narrow track width regulating groove (3). The fused glass is melted and filled, (the window is the winding window for winding the coil, (7) is the gap, and (8) is the movement of the medium.

The magnetic head block configured in this way runs over the narrow track width regulating groove (3) filled with welded glass (5).
It is cut along the A-A line with a grindstone or the like to form individual heads.

On the other hand, the magnetic head block constructed as described above is manufactured through the steps shown in FIG. First, as shown in FIG. 7(a), a rectangular parallelepiped core block (1) is formed by cutting and grinding a material made of ferrite or the like with a grindstone or the like. Next, as shown in FIG. 7(b), on the top surface of the core block (1), there is a glass groove {2} that serves as a glass retainer in the longitudinal direction of the core block (1), and a glass groove {2} is formed on the outside of the core block (1). Track width of the magnetic head along the edge. The determined narrow track width regulating groove (3) is formed by grinding using a rotating grindstone.The shape of the glass groove (2) may be any shape such as a round groove or a square groove.Next As shown in Figure 7(c), when a glass rod (4) is placed in a glass groove (2) and heated to a high temperature above the working point of the glass in an inert gas atmosphere, the glass rod (4) melts. Then, the glass groove (2) and the narrow track width regulating groove (3) are filled with welded glass (6), as shown in Fig. 7(d). If the working temperature is raised too high, the molten welded glass (5) will flow down from the surface of the core block (1), but if processed at an appropriate temperature, the welded glass (5) will not flow down due to surface tension and will flow down from the core block (1). ) can be solidified to cover only the top surface.
), the welded glass (5) on the core block (1) is removed by grinding or the like to expose the upper surface of the core block (1), and the core block (1) is removed as shown in FIG. 7(f).
). Grind the winding window (6) for winding the coil in the longitudinal direction. Next, grind the silicon oxide (6) that will become the head gap.
sputtering, vapor deposition, etc. of non-magnetic materials such as
It is formed on the core block (1) using a thin film formation technique (not shown). A pair of core blocks (1) filled with welded glass (6) obtained by the above method are joined axisymmetrically and heated at high temperature in an inert gas atmosphere. Since the welded glass (5) in the glass groove (2) is melted and integrated, both core blocks tta) (1b) are welded, and the magnetic head block shown in FIG. 6 is completed.

[Problem to be solved by the invention]

The method of melting and filling the welded glass in the conventional manufacturing method of the magnetic head is to place the welded glass (5) on the core block (11).
) is melted and filled into the glass groove (21) and the narrow track width regulating groove (3), but the welding is difficult due to poor wettability between the welded glass (5) and the core block (1) and poor filling properties. The melting and filling temperature of the glass was set above the working point of the glass to lower the viscosity of the glass and increase its filling properties.

However, although the viscosity of the welded glass (5) heated above the working point decreases, it becomes activated and erodes the core block (1), degrading the magnetic properties of the core block (1). , a problem arose in that the performance of the morale head was degraded. Furthermore, due to poor wettability between the core block (1) and the welded glass (5), air bubbles are drawn in when glass is filled into the narrow track width regulating groove (3), resulting in welding on the sliding surface of the magnetic head. Air bubbles appear on the surface layer of the glass (5), and when the magnetic head slides on the medium, the glass layer above the air bubbles is scraped away, forming a recess. Powder clogging caused spacing between the magnetic head and the medium, resulting in so-called head jamming, which also resulted in problems such as deterioration of the characteristics of the morale head.

The present invention was made to solve such problems, and it improves the wettability and filling properties of the core block and the welded glass, and also prevents the erosion of the welded glass into the core block.
The purpose of this invention is to reduce the generation of bubbles in welded glass and to obtain a method for manufacturing a magnetic head with high quality and high reliability.

[Means to solve the problem]

The method for manufacturing a magnetic head of the present invention includes forming a thin glass layer on the inner surface of the narrow track width regulating groove of a core block forming a component of the magnetic head by a thin film forming technique such as sputtering or vapor deposition. Afterwards, welded glass is melted on the thin film-like glass layer, and the glass is filled into the narrow track width regulating groove.

[Effect]

In the present invention, since the thin film glass layer softens at a temperature higher than the softening point, at the melting/filling temperature of the welded glass,
The thin glass layer softens and integrates with the welded glass to fill the narrow track width regulating groove, improving the wettability between the glass filled in the groove and the core block and suppressing the entrainment of air bubbles, etc. This also improves filling properties. Therefore, the thin glass layer becomes sticky as welded glass. Even when filled into narrow track width regulating grooves with relatively high viscosity, it suppresses the occurrence of defects such as bubbles, lowers the melting and filling temperature of the welded glass, and prevents erosion of the glass core block. can be

Furthermore, since the thin glass layer is formed by a thin film forming technique such as sputtering or vapor deposition, air bubbles in the thin glass layer can also be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 shows a perspective view of a magnetic head block. Items (1) to (8) in FIG. 1 are the same as the structural parts of the conventional magnetic head block shown in FIG. 6 above.

(9) is a thin glass layer interposed between the core block (1) and the welded glass (5), and is formed by thin film forming techniques such as sputtering or vapor deposition before melting and filling the welded glass. be.

Although the thin glass layer (8) and the welded glass (5) are shown separated in FIG. 1, they are actually integrated with the welded glass (6) and cannot be distinguished.

Next, a method of manufacturing the magnetic head block configured as described above will be explained. First, the steps shown in FIGS. 7(a) and 7(b) are carried out in the same manner as described in the conventional technique,
A glass groove (2) and a narrow track width regulating groove (3) are formed on the upper surface of the core block (1). Next, as shown in FIG.
As shown in ), a thin glass layer ( 9). Then, apply the
As shown in b), place the glass rod (4) on the glass groove (2)
and heated at high temperature in an inert gas atmosphere.
The narrow track width regulating groove (3) is filled with welded glass (5). Next, as in the conventional technique, the welded glass (5) on the core block (1) is removed by grinding or the like to expose the upper surface of the core block (1), and the winding window (6) is ground. A silicon oxide layer that will become a head gap is formed on the core block (1).

The welded glass (5) formed in this way is connected to the glass groove (
2] and a pair of core blocks (la) and (lb) filled in the narrow track width regulating groove (3) are joined and integrated axisymmetrically to obtain the magnetic head block shown in FIG.

Thereafter, individual magnetic heads are obtained by cutting along the cutting line indicated by A-A in the figure.

Next, the inventors manufactured thin glass layers (9) with various thicknesses and conducted studies, and found that the film thickness was I
If the thickness is less than OOOA, when the glass layer (9) is melted by high-temperature heating of the welding glass (5), it will become striped due to surface tension, resulting in uneven wettability. The method required a long time to form the glass layer (9), was poor in mass productivity, and had practical problems.

Therefore, the thickness of the glass layer (9) is 1 (more than 100A and several μm).
m or less is preferable.

The inventors also investigated the heating temperature of the welding glass (5), the filling property of the welding glass (5) into the glass groove (2) and the narrow track width regulating groove (3), and the welding glass (5). The relationship between this and the erosion of the core block (1) was investigated.

As shown in Figure 3, the relationship between heating temperature and viscosity is that the higher the heating temperature, the lower the viscosity. (3) Low viscosity was required to increase the filling property of the glass layer, and the heating temperature was set above the working point (650'Q).In contrast, the glass layer formed by thin film formation technology In the case of the above-mentioned example in which (9) is provided, as long as the heating temperature is above the softening point of the glass, even if the viscosity of the molten glass (5) is higher than that of the conventional method, the glass When the temperature exceeds the softening point, the thin glass layer (9) softens, and the welded glass (5) becomes integrated with this glass layer (9), resulting in a rapid improvement in wettability with the core block. This is thought to be due to improved filling properties.

Moreover, since the heating temperature is above the softening point of the glass, the welding glass +51 can be filled into both grooves +21 (3), which is defective. 5) can suppress the activation of
The erosion of the welded glass into the core block (1) is suppressed, the erosion into the core block (1) is suppressed, and the deterioration of the magnetic properties of the core block (1) can be suppressed.

Therefore, it is preferable that the heating temperature of the welded glass <<5>> is set to be higher than the softening point of the glass and lower than the working point of the glass.

In the magnetic head manufactured as described above, since the glass layer (9) was formed by thin film technology, the glass layer (9)
) There may be no air bubbles in this glass layer《9》
This improves the adhesion between the molten glass (5) and the core block (1), and improves the filling of the welded glass (5) into the glass grooves (2) and narrow track width regulating grooves (3).
5) is filled in an integrated manner, so that air bubbles are less likely to be involved. Furthermore, since the heating temperature of the welded glass (5) can be suppressed below the working point, the core block (1)
Prevent the penetration of the welded glass (5) into the core block (1).
This suppresses the deterioration of the magnetic properties of As a result, quality and reliability are improved.

FIG. 4 shows another embodiment of the present invention. First, as shown in FIG. 4(a), two core blocks (l
a) After welding (lb), narrow track width regulating groove (
A thin glass layer (9) is formed on the entire surface of the core block (ta)+lb) including the inner surface of the narrow track width regulating groove (3) using a thin film forming technique such as sputtering or vapor deposition. ), then glass grooves (2
After melting and filling glass by placing a glass rod (4) on top of the core block (la) as shown in Figure 4(b).
(xb) Polish the welded glass (5) to expose the entire surface. Thereafter, it is cut along the cutting line A--A in the figure to obtain individual magnetic heads.

Even with this structure, the leakage of the glass
The filling property is improved, the heating temperature during glass melting can be lowered, and the erosion of the glass to the core block can be reduced, producing the same effects as in the above example and having a significant effect on the morale head characteristics. Welding glass to the gap material (
Seasonal erosion can also be reduced.

FIG. 5 shows still another embodiment, in which the same effect can be obtained by manufacturing the core block (la) in the same manner as shown in FIG. 4 compared to the one shown in FIG. At the same time, it is possible to reduce the erosion of the welded glass (6) into the alloy magnetic material, which occurs as the temperature rises.It is possible to suppress the diffusion reaction between the alloy magnetic film αq and the core block (11). Membrane 4 and core block (1
) The magnetic head characteristics are not deteriorated due to the pseudo gap caused by the formation of a diffusion reaction layer on the intervening surface, and it also has the effect of obtaining good head characteristics.

In the above embodiment, a method for manufacturing a magnetic head that forms two core blocks has been described, but the present invention is not limited to this, and it goes without saying that the method can be applied to other methods for manufacturing a magnetic head.

〔Effect of the invention〕

As described above, the present invention provides the following advantages: After a thin glass layer is deposited on at least the inner surface of the narrow track width regulating groove by a thin film forming technique such as sputtering or vapor deposition,
Since the grooves are filled with glass, the wettability of the glass with the core block and the filling performance into the narrow track width regulation width are improved, the generation of air bubbles can be reduced, and the glass can be easily melted and filled. The heating temperature can also be lowered, and the erosion of the glass into the core block can be reduced, so that a high quality and highly reliable magnetic head can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 show one embodiment of the present invention. Figure 1 is a perspective view showing a borosilicate head block, Figure 2 is a perspective view of the main parts showing the order of steps, and Figure 3 is a diagram showing the heating temperature of glass. A diagram showing the relationship with viscosity, FIG. 4 is a perspective view of a main part showing another embodiment of the present invention in the order of steps, and FIG. 5 is a perspective view of a main part of a magnetic head block showing still another embodiment of the invention. 6 and 7 show the prior art, FIG. 6 is a perspective view of a magnetic head block, and FIG. 7 is a perspective view showing the order of steps. . In the figures, (l) is the core block, <<3>> is the narrow track width regulating groove, (6>> is the welded glass, and (9>> is the thin glass layer. In addition, the same reference numerals in each figure are the same) or a corresponding portion.

Claims (1)

[Claims] A step of forming a groove that determines the track width of the magnetic head in a block forming a magnetic head component, and depositing a glass layer on at least the inner surface of the groove by a thin film forming technique such as sputtering or vapor deposition. A method for manufacturing a magnetic head, which includes the step of filling the inside with glass.