JPS6220610B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an embedded core type core slider used in a magnetic disk device, and in particular, a method for manufacturing a core slider of an embedded core type used in a magnetic disk device, and in particular, a magnetic material without a magnetic gap is embedded in a non-magnetic material and bonded by welding glass. The present invention relates to a manufacturing method in which the magnetic gap is later formed by integrating the magnetic gap.

As the performance of electronic computers increases and becomes more widespread, demands for high-density recording of magnetic disk devices are becoming stronger. In particular, as a means of increasing density, magnetic heads are being made smaller in size by narrowing tracks and narrowing gaps due to shorter recording wavelengths. Conventionally, embedded core sliders used in magnetic disk heads use ceramic as a non-magnetic material for the slider material, and ferrite (Mn-Zn or Ni-Zn) for the embedded core.
A magnetic head is formed by bonding with welded glass and then performing various machining processes.

The conventional method will be explained below. Figures 1a to d are structural diagrams showing an embedded core type core slider, and are a plan view, a front view, a side view, and A of Figure 1b, respectively.
An enlarged view of the part is shown. Furthermore, FIGS. 2a and 2b are structural diagrams showing the core with a magnetic gap formed, and FIGS.
4b is a structural diagram showing the slider material of the conventional method, FIG. B-
It is an arrow view of B' plane.

In Fig. 1, an embedded core type core slider 1
A core 4 with a magnetic gap formed therein is embedded in a non-magnetic material 2 via a welded glass 3. As shown in FIGS. 1b and d and 2a and b, the core 4 used for this embedding is bonded to the cores 4a and 4b by welding glasses 5a and 5b, and the magnetic gap gl
is formed. A gap is provided between the cores 4a and 4b, and a winding window 6 allows a read coil or a write coil to be wound around the core 4b. Both cores 4a and 4b are connected at the top of the winding window 6.
Generally, the part where the two are in parallel contact is the magnetic gap.
It is called depth GD, for example 15±
Products with dimensions and precision of about 3.0 microns are manufactured. In addition, the cores 4a and 4b of this parallel part
The distance between them is the above-mentioned magnetic gap gl, which is manufactured with dimensions and accuracy of, for example, about 1±0.2 microns.

These magnetic gap GL and magnetic gap
In order to achieve high-density recording, the depth gd is further miniaturized. The welded glass 5a extends downward from the illustrated point P. This part is the core 4a, which becomes weak due to the miniaturization of the magnetic gap GL and the magnetic gap depth GD.
This is a part that reinforces the joining strength of 4b.

Here, high melting point glass is used for the welding glasses 5a and 5b, and the integrally molded core 4 is embedded in a slider material 7 and bonded with the welding glass 3 having a low melting point, as shown in FIG. After that, cutting is performed from the part indicated by the dashed-dotted line, and the external shape shown in Figure 1 is processed by mechanical cutting, grinding, or abrasive processing, such as cutting using a diamond whetstone or wire saw, or polishing using abrasive grains or diamond paste. is applied. Here, the width T of the tip of the core 4 shown in FIG. 1c is a dimension that determines the track width spacing on the magnetic recording medium. By the way, in the conventional method, as shown in FIGS. 3 and 4, the position of the embedded core 4 is not aligned with respect to the reference surface S of the slider material 7, and a slight deviation occurs, resulting in the magnetic gap depth gd'' As shown in the figure, gd1'' or gd2'' is not constant. This is a problem that arises from the limitations in adjustment work because the cores are individually formed and embedded individually. Therefore, in the past, complicated adjustment means were required.An object of the present invention is to eliminate the conventional complicated adjustment means,
To provide a method for manufacturing an embedded core type core slider that eliminates the need for machining to create individual embedded cores, and enables high-precision, high-density recording with uniform dimensions and accuracy of the magnetic gap and magnetic gap/depth. be. According to the present invention, comb-shaped grooves are provided on one surface of the non-magnetic slider material constituting the rectangular parallelepiped,
A magnetic material without a magnetic gap is embedded in the comb-shaped groove and bonded to a non-magnetic slider material using high melting point welded glass to form a bonded body. including the body
Cut perpendicularly to the magnetic material embedding direction to obtain two sections, process a winding window on the cut surface of the magnetic material embedding side section, polish the cut surface produced by the cutting to a mirror surface, and then, A method for manufacturing a core slider of an embedded core type, in which both polished surfaces are aligned so that the magnetic bodies meet each other, and then joined by a welded glass having a melting point lower than the above-mentioned high melting point to form a magnetic gap. is obtained.

This will be explained below with reference to the drawings. 5 to 8 are explanatory diagrams showing an embodiment of the present invention, in which FIGS. 5 a and 8 are explanatory diagrams of a magnetic material structure, and FIGS. 6 a and b are explanatory diagrams of a magnetic material embedding process, Figures 7a and b are explanatory views of the magnetic gap formation process, Figures 8a and b are explanatory views showing other advantages of the present invention, and Figure 8c is d of Figure 8b.
-d' plane cross-sectional view. In each figure, the same parts as in FIGS. 1 and 3 are given the same reference numerals. In the manufacturing method of the present invention, first, a magnetic body 9 made of ferrite without a magnetic gap is embedded in the slider material 7, and a high-melting point welded glass is pressed against each embedded gap, and then the magnetic body 9 is heated in an electric furnace. Then, by performing high heat treatment at about 700 to 800°C, the slider material 7 and the magnetic body 9 are integrally formed with the welded glass 8 interposed therebetween. Thereafter, the section 10 is obtained by mechanically cutting it so as to have a plane parallel to the embedding surface as shown by the dashed line in FIG.

Next, the section 10 is mechanically ground in the direction c-c' in order to obtain the winding window 6 and the magnetic gap depth gd'' as shown in FIG. The cut surface created when cutting the slider material 7 is polished to a mirror surface. Although the section 10 after this processing is not shown, a spacer is sandwiched in the middle so that the cut surface with the slider 7 is at the position before cutting. After that, the low melting point glass is pressed against the outer periphery of the cut surface and heat treated at about 550 to 600°C in the electric furnace described above.The magnetic material 9 is attached to the slider. The part embedded in 7 and the part separated along with section 10 are joined by welded glass 11a, 11b, and the magnetic gap GL and magnetic gap depth GD'' are uniform and the slider material has an extremely small deviation. 7 is completed.

By mirror-finishing or polishing the reference surface S of the slider material 7, the magnetic gap depth can be finished to a desired dimension (gd).

This completed slider material 7 is shown in Figures 1 and 3.
Embedded core type core slider 1 by machining by conventional method as described with reference to the figure.
is obtained. Here, if the shaded portion 12 is machined to be cut out from the slider material 7 as shown in FIG. 8 is left in place, when the coil 13 is passed through the winding window 6 and wound around the magnetic body 9, even if an insulating material such as an enamel coating is torn, there will be no short circuit with the magnetic body 9. As explained in the above example, a plurality of comb-shaped grooves are provided on one surface of a non-magnetic material made of a rectangular parallelepiped, a magnetic material without a magnetic gap is embedded, and the material is bonded with welded glass to form an integrated structure. The magnetic material and non-magnetic material are cut along a plane parallel to the embedding surface to form a magnetic gap and magnetic gap depths.
A highly accurate embedded core type core slider with uniform depth dimensions and precision can be obtained.

Furthermore, since dimensions and accuracy can be made uniform, it is possible to process narrow magnetic gaps or magnetic gap depths that were previously impossible. Furthermore, there is no need for the process of individually creating the core 4, the adjustment for dimensional matching of the magnetic gap depth, the polishing process, etc. as in the past, and the machining process can be extremely simplified.

As described above, the present invention provides a method for manufacturing an embedded core type core slider that enables high-density recording.

[Brief explanation of the drawing]

Fig. 1 a, b to d are configuration diagrams showing an embedded core type core slider, Fig. 2 a, b are structural diagrams showing a core with a magnetic gap formed, and Fig. 3 a, b show a slider material of the conventional method. 4 is an explanatory diagram showing the drawbacks of the conventional method, FIGS. 5 to 8 are explanatory diagrams showing an embodiment of the present invention, and FIGS. 5a and 5b are structural diagrams of the magnetic material, FIGS. 6a and 6b are explanatory views of the process of embedding the magnetic material, FIG. 7 is an explanatory view of the process of forming a magnetic gap, and FIGS. 8a, b, and c are explanatory views showing other advantages of the present invention. 1...Embedded core type core slider, 2...Nonmagnetic material, 3, 5a, 5b, 8, 11a, 11b...
Welded glass, 4... Core, 6... Winding window, 7...
Slider material, 9... Magnetic material, 10... Section, 13
……coil.

Claims (1)

[Claims] 1. A comb-shaped groove is provided on one surface of the non-magnetic slider material constituting the rectangular parallelepiped, a magnetic material without a magnetic gap is embedded in the comb-shaped groove, and the non-magnetic slider material is bonded with high melting point welded glass. The magnetic material part embedded in the bonded material, including the non-magnetic material, is cut at right angles to the magnetic material embedding direction to obtain two sections, and the section on the side where the magnetic material is embedded is cut. A winding window is processed on the surface, the cut surface produced by the cutting is polished to a mirror surface, and then both polished surfaces are faced and aligned so that the magnetic materials match each other, and compared to the high melting point. 1. A method of manufacturing a core slider of a buried core type, characterized in that the core slider is bonded with a welded glass having a low melting point to form a magnetic gap.