JPS6262413A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To design a dimension with high accuracy and to reduce the dispersion in the dimensions of products in a mass production and to manufacture a magnetic head with a good quality by regulating a space dimension between a magnetic reproducing core and an erasing core manufacturing symmetrically it against a recording and reproducing core center in the thin part of a recording and reproducing core. CONSTITUTION:After a recording and reproducing gap 1a is formed joining a pair of core blocks 11 and 12 through a non-magnetic material, the joined body is segmented, obtaining a core ship in which core halves 1A and 1B have the same widths, and after that, a recording and reproducing core 1 having a thin part 1b is obtained by cutting both sides of the core half 1b leaving its left side part. On the other hand, an erasing core block 13 on which a groove part 14a is formed and reinforced with a non-magnetic material 3 is segmented, obtaining an erasing core chip 14. At the next, by placing the erasing core chip 14 on the groove part 14a combining it with the groove part 15a in a front plate block 15, fixing both with a non-magnetic material 16, such as glass, etc. and grinding them, the dimension 2d of an erase core 2 can be decided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of manufacturing a magnetic head, and particularly to a method of manufacturing a straddle type magnetic head.

[Conventional technology]

FIGS. 5 and 6 are an exploded perspective view and a plan view showing the structure of a conventional magnetic head. In the figure, 1 is a recording/reproducing core made of a magnetic material such as ferrite, in which a pair of core halves IA and IB are joined with a non-magnetic material to form a recording/reproducing gear 1a between them, and 2 is a recording/reproducing core made of a magnetic material such as ferrite. A pair of erasing cores made of a magnetic material such as ferrite or sendust are arranged in parallel. Each of these erasing cores 2 is reinforced with a non-magnetic material 3 such as glass.

Reference numeral 4 denotes a front plate made of a non-magnetic material such as ceramic and provided with a groove 4a into which the erasing cores 2 are inserted.
A pair of front plates 4 face each other with the recording/reproducing core 1 in between.

When assembling a conventional magnetic head having such a configuration, the pair of erasing cores 2 are positioned and temporarily positioned so that an erasing gap 2a of a predetermined size is formed between the recording/reproducing core l and the erasing core 2. After fixing, fix with a bonding material such as glass. Here, the width of the tip of the recording/reproducing core 1 is 1. corresponds to the trunk width of the magnetic disk.

In such a conventional magnetic head, since the recording/reproducing core l is configured to have a uniform thickness throughout, the width t1 of its tip facing the magnetic disk is also uniform.

Incidentally, in recent years, with the spread of electronic computers, magnetic disk drives have become faster and have larger capacities, and as a result, there has been a demand for further improvements in recording density, from single-sided to double-sided types, from single-density to double-density, and even narrower recording tracks. Track density and density are increasing.

[Problem that the invention seeks to solve]

In conventional magnetic heads, in order to accommodate higher density and narrower tracks, the thickness of the recording/reproducing core l has been made thinner.
The width 1 of the tip has been made smaller. However, as mentioned above, since the recording/reproducing core 1 has a uniform thickness throughout, a drawback has arisen in that the thinner the plate thickness is, the lower its mechanical strength is and the more easily it breaks.

Therefore, the present applicant has already proposed a magnetic head in which a portion of the tip of the recording/reproducing core is made thinner than the other portion of the tip, and erasing cores are arranged on both sides of this thin portion. - In such a magnetic head, the width dimension of the erasing core can be substantially increased, so the erasing effect is large, and the override effect of the recording/reproducing core overlaps with the trim erase effect of the erasing core. It has advantages such as being able to improve the signal-to-noise ratio (S/N ratio) of

An object of the present invention is to provide a method of manufacturing a magnetic head in which a portion of the tip of such a recording/reproducing core is thinned.

[Means for solving problems]

The method for manufacturing a magnetic head of the present invention involves bonding a pair of recording/reproducing core blocks via a non-magnetic material to form a recording/reproducing gap, and then cutting out the joined body to form a core chip in which one core half and the other core half have the same width. and further cutting both sides of the other core half to obtain a recording/reproducing core having a thin wall portion; a step of obtaining an erasing core chip by cutting out the erasing core block in which a groove is formed; and cutting the erasing core chip into the groove. A step of combining the grooves drilled in the front plate block and fixing both with a non-magnetic material, and then dividing the assembly into two to obtain a pair of front plates with erasing cores; and positioning the erasing core so that they face each other, and fixing the recording/reproducing core and the front plate with the erasing core with a non-magnetic material.

[Effect]

In the method for manufacturing a magnetic head of the present invention, the dimensions of the erasing gear and thread between the recording/reproducing core and the erasing core are determined by the machining symmetry of the thin portion of the recording/reproducing core with respect to the center of the recording/reproducing core.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a magnetic head manufactured by a method for manufacturing a magnetic head according to an embodiment of the present invention. In the figure, a recording/reproducing core 1 has a pair of core halves IA and I.
By joining B with a non-magnetic material such as glass, a recording/reproducing gap 1a is formed between the two. In contrast to one core half IA, the other core half IB is formed to have a thinner width except for the left end. A pair of erasing cores 2 are disposed on both sides of the thin wall portion 1b of the other core half IB with a non-magnetic material 5 in between, and an erasing gap 2a is provided between the other core half IB and the erasing core 2. each formed. In addition, the pair of erasing cores 2 are
It is inserted into a groove 4a provided in a front plate 4 made of a non-magnetic material such as ceramic.

Next, a method for manufacturing a magnetic head according to an embodiment of the present invention for manufacturing a magnetic head having such a configuration will be described.

First, as shown in FIG. 2 (al), a pair of core blocks 11 and 12 are joined via a non-magnetic material to form a recording/reproducing gap 1a, and then, as shown in FIG. 2 (tbl),
This joined body is cut out to obtain a core chip in which the core halves IA and IB have the same width, and then, as shown in FIG. 1b is obtained.

On the other hand, as shown in FIG. 3 (al), the erase core block 13 in which the groove portion 14a is formed and reinforced with the non-magnetic material 3 is cut out to obtain the erase core chip 14.

Next, as shown in FIGS. 3-), the erase core chip 14 is assembled into the groove 15a of the front plate block 15 at the groove 14a, and both are fixed with a non-magnetic material 16 such as glass. After this, as shown in FIG. 3 (C1), the recording/reproducing core 1
Surfaces 4C and 2c that are opposite to the surface are precision ground l! ! (
(lapping, polishing, etc.), and the dimensions 2d (see FIG. 4) of the erase core 2 are determined by this polishing. and,
The combination of the erase core chip 14 and the front plate block 15 is divided into two front plates with erase cores along the center line.

Next, as shown in FIG. 4, the positions of the erasing cores 2 of the left and right front plates 4 with respect to the recording/reproducing core l are determined using the reference plane 4b.
A front plate with an erasing core is fixed to the recording/reproducing core 1 via a non-magnetic material 5 such as glass (see FIG. 1).

Thereafter, a recording/reproducing coil is wound around the recording/reproducing core 1 and a bank core (not shown) is attached to the recording/reproducing core 1, and an erasing yoke (not shown) around which an erasing coil is wound is attached to the erasing core 2. A magnetic head is obtained.

〔Effect of the invention〕

As explained above, according to the present invention, the gap size between the recording/reproducing core and the erasing core is determined by the processing symmetry of the thin portion of the recording/reproducing core with respect to the recording/reproducing core center.
It is possible to provide a method for manufacturing a magnetic head that can achieve high dimensional accuracy, reduce variation in product dimensions during mass production, and manufacture a high-quality magnetic head.

[Brief explanation of drawings]

FIG. 1 is a plan view of a magnetic head manufactured by the method of manufacturing a magnetic head of the present invention, and FIGS. FIGS. 3+al to tc+ are perspective views showing the sequential forming steps of a front plate with an erasing core in a method of manufacturing a magnetic head according to an embodiment of the present invention. FIG. FIG. 5 is an exploded perspective view showing an example of a conventional magnetic head; FIG. 5 is a plan view of the magnetic head shown in FIG. 5. In the figure, 1... recording/reproducing core, LA, IB... core half, 1a...- recording/reproducing gap, 1b... thin wall portion, 2... Erasing core, 2a...Erasing gap, 3...Reinforcing non-magnetic material 4...Front plate, 4a...Groove portion, 5...Non-magnetic material, 11.12...Recording/reproduction core block, 13 ... Erasing core block, 14... Erasing core chip, 15... Front plate block, 15a... Groove portion. Fig. 2(b) Fig. 2(C) Fig. 3(a) Fig. 3(b) ) Figure 3 (c) Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] After joining a pair of recording/reproducing core blocks via a non-magnetic material to form a recording/reproducing gap, the joined body is cut out to obtain a core chip in which one and the other core halves have the same width, and then the other core half has the same width. a step of obtaining a recording/reproducing core having a thin wall portion by cutting both sides of the core half of the core half; a step of obtaining an erasing core chip by cutting out an erasing core block in which a groove is formed; and a step of cutting the erasing core chip into a front plate block by cutting out the erasing core block in which the groove is formed. A step of dividing the assembly into two to obtain a pair of front plates with erasing cores after combining the grooves drilled in the grooves and fixing both parts with a non-magnetic material; A method of manufacturing a magnetic head, comprising: positioning the recording/reproducing core and the front plate with an erasing core so that they face each other, and fixing the recording/reproducing core and the front plate with the erasing core with a non-magnetic material.