JPS6220605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic head used in a magnetic recording device and the like, and more particularly to a method of manufacturing a magnetic head that can reduce the number of manufacturing steps.

A conventional method of manufacturing a magnetic head, particularly the steps up to forming the winding window grooves, will be explained with reference to FIGS. 1 to 4. First, as shown in FIG. 1, a plurality of ferrite substrates 1, for example ten ferrite substrates 1, are bonded to each other with wax 2 in the same direction, and then fixed onto a glass rod jig 3. Next, these ferrite substrates 1 are cut along A-A' in Fig. 1 using an inner circumferential slicer, and the cross-sectional view is ground using a surface grinder to obtain small ferrite substrates as shown in Fig. 2. Each substrate 4 is obtained. Next, this ferrite small substrate 4 is cleaned with a solvent, and as shown in FIG. Fix using wax 2. Then, using a high-speed rotating whetstone formed into the shape of a winding window groove, the whetstone is fed to a dimension B from the reference surface of the jig 5 to the tip of the winding window groove 7, as shown in FIG. Machining groove 7. This winding window groove 7 is connected to each small ferrite substrate 4.
Each item is processed individually.

In the conventional magnetic head manufacturing method carried out in this manner, as shown in FIG. and surface accuracy (sloping) due to surface grinding as shown in Figure 2.
b, etc., the dimension up to the tip of the winding window groove of the ferrite small substrate 4 shown in FIG. The base material immediately before forming a magnetic head (hereinafter referred to as the "magnetic head" It is not possible to grind the original object (referred to as "original object"), and as a result, there are problems in that it takes too many manufacturing steps and the yield is poor. In addition, the variation in the above-mentioned winding window groove height dimension C in this conventional manufacturing method is ±9μ.
It was about m hot.

The present invention has been made in view of the actual situation of the prior art, and its purpose is to:
It is an object of the present invention to provide a method for manufacturing a magnetic head, which suppresses variations in the height dimension C of the winding window groove as much as possible, and makes it possible to simultaneously grind a large number of magnetic head prototypes in a cylindrical grinding process.

Hereinafter, the present invention will be explained based on the drawings. 5 to 9 are explanatory diagrams showing the method of manufacturing the magnetic head of the present invention, in particular, FIG. 5 is a cross-sectional view showing the state of a small ferrite substrate before winding window grooves are processed, and FIG. A cross-sectional view showing a state in which a ferrite substrate is cut into multiple ferrite small substrates after processing a line window groove,
Fig. 7 is a cross-sectional view showing a cut state of the ferrite substrate without winding window groove processing, Fig. 8a is a front view showing the magnetic head prototype before cylindrical grinding, and Fig. 8b is Fig. 8a. FIG. 9a is a front view showing the magnetic head after cylindrical grinding, and FIG. 9b is a side view of FIG. 9a.

In the present invention, first, as shown in FIG. 5, a plurality of ferrite substrates 1 are placed horizontally, for example, in a row, on the upper surface of a jig 5 in which grooves 6 are formed in the wax 2. The substrate 1 is fixed with wax 2. The jig to which the ferrite substrate 1 is fixed in the following manner is fixed on the table of the peripheral slicer.
Then, a temporary groove is formed in the ferrite substrate 1 at a predetermined distance from the reference surface of the fixed jig 5 using a grindstone formed in the shape of a winding window groove. Reference numeral 11 in FIG. 6 indicates the above-mentioned position. Next, as shown in FIG. 6, with the temporary groove as a reference (position 11 as a reference), a winding window groove forming grindstone is sent by the height C of the winding window groove, and this grindstone is used to cut the ferrite substrate 1. The first winding window groove 12 is processed. Furthermore, the winding window groove height dimension C, based on this first winding window groove 12,
The grindstones are sent in order at a pitch equal to the gap depth E and the thickness F of the parallel grindstone for cutting the board, and the second winding window groove 13 and the third winding window groove 14 are formed on the ferrite substrate 1. , process the fourth winding window groove 15. Then, the ferrite substrate 1 is cut at the position 11 where the temporary groove is provided using the above-mentioned parallel grindstone for cutting the substrate with the thickness F, and further, with this position 11 as a reference, the height dimension C of the winding window groove is set to the gap depth E. The ferrite substrate 1 is sequentially cut at a dimension pitch including
A plurality of small ferrite substrates 4' are obtained. The variation in the height dimension C of the winding window groove of the small ferrite substrate 4' thus obtained was approximately ±3 μm.
Next, as shown in FIG. 7, the ferrite substrate 1 without winding window groove processing is fixed to the jig 5 in the same manner as described above, and the ferrite substrate 1 is placed one by one at a pitch equal to the sum of the winding window groove height dimension C and the gap depth E. The ferrite substrate 1 is cut to obtain a plurality of small ferrite substrates 4''.Then, the small ferrite substrates 4', 4'' thus obtained are cleaned with a solvent. Next, track processing is performed on the ferrite small substrate 4' with the winding window groove processed and the ferrite small substrate 4'' without the winding window groove processed, and the mirror surfaces of these ferrite small substrates 4' and 4'' are made of glass. A gap is formed by thermocompression bonding to obtain the magnetic head prototype shown in FIG. In FIG. 8, 8 is a glass, 9 is a gap, and 10 is a truck. Thereafter, using the winding window groove height dimension C as a reference, a large number of magnetic head prototypes shown in FIG. 8 are arranged side by side and cylindrically ground, whereby a large number of magnetic heads shown in FIG. 9 are simultaneously obtained.

As described above, according to the method of manufacturing a magnetic head of the present invention, the winding window grooves can be continuously provided in a very short period of time, and variations in the height dimensions of the winding window grooves can be suppressed to a small level. Therefore, in the cylindrical grinding process, it is possible to grind a large number of items at the same time instead of grinding each item individually as in the conventional method, which has the effect of significantly reducing the number of manufacturing steps. Furthermore, this reduction in man-hours has the effect of reducing costs by approximately 30%.

[Brief explanation of the drawing]

1 to 4 are explanatory diagrams showing a conventional method for manufacturing a magnetic head, and FIGS. 5 to 9 are explanatory diagrams showing a method for manufacturing a magnetic head according to the present invention. In particular, FIG. A cross-sectional view showing the state of the ferrite substrate before groove processing, Fig. 6 is a cross-sectional view showing the state in which the ferrite substrate is cut into a plurality of small ferrite substrates after processing the winding window groove, and Fig. 7 shows the state of the winding window. 8a is a front view showing the state before cylindrical grinding, 8b is a side view of 8a, and 9a is cylindrical. A front view showing the state after grinding, Figure 9b is Figure 9a
FIG. 1... Ferrite substrate, 4', 4''... Ferrite small substrate, 5... Jig, 11... Position, 12...
First winding window groove, 13...Second winding window groove, 14
...Third winding window groove, 15...Fourth winding window groove,
C... Winding window groove height dimension, E... Gap depth,
F...Thickness of the parallel grindstone for cutting the board.

Claims (1)

[Claims] 1. In a method for manufacturing a magnetic head used in a magnetic recording device, etc., after bonding a ferrite substrate to a jig, a
A temporary groove is machined on the ferrite substrate using a whetstone formed in the shape of a winding window groove, and then the above whetstone is fed by the height of the winding window groove using this temporary groove as a reference, and this whetstone is used to process a temporary groove on the ferrite substrate. The first winding window groove is machined, and the pitch is determined by adding the height of the winding window groove, the gap depth, and the thickness of the parallel grindstone for cutting the board based on the first winding window groove. Sequentially send the above-mentioned grindstone to process a plurality of winding window grooves on the ferrite substrate, then cut the ferrite substrate at the above-mentioned temporary groove position using the above-mentioned parallel board cutting grindstone, and further use this temporary groove position as a reference. A method for manufacturing a magnetic head, characterized in that the ferrite substrate is cut by sequentially feeding the parallel grindstone at a pitch equal to the height of the winding window groove plus the gap depth.