JPS6396709A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To form a magnetic head with high accuracy, by cooling after pouring a molten low-m.p. glass in a metallic die, and integrating a slider made of a low-m.p. glass with a magnetic core. CONSTITUTION:The magnetic core 18 is formed in such way that a C-type core 15 and an I-type core 16 are butted and joined preliminarily, and a high-m. p. glass is interposed in the cavity of a butted part, thereby, a magnetic gap 17 is formed. And the magnetic core 18 is positioned and arranged so that the I-type core 16 can be positioned in a slider type mold 30. At this time, a closing part 32 closes a winding window 19 to prevent a molten glass 31 from being poured into the winding window 19. Next, the molten low-m.p. glass 31 is poured into the slider type mold 30. After cooling, the slider type mold 30 is removed, and a slider 11 having a desired shape is molded, and also, the slider 11 and the magnetic core 18 are integrated by the molten glass 31 for forming the slider. In this way, it is possible to obtain the magnetic head with few dispersion in a size, and with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method of manufacturing a magnetic head in which a magnetic core and a slider are integrated.

"Prior Art and its Problems" Conventionally, floating magnetic heads and magnetic heads for flexible disks have been known as magnetic heads using sliders.

For example, in a floating magnetic head as shown in FIG.
The slider is manufactured using calcium titanate, non-magnetic ferrite, glass, etc. as the material, and through the processing steps described below.

First, a block of the above material is cut out to form a slider 11 of a desired shape. That is, one surface of the block material is ground to form the rails 12 on both sides, and the winding groove 13 is formed at the rear end of the slider 11 perpendicularly to the direction in which the rail 12 is formed. A core insertion groove 14 is formed by grinding on one rail 12 side perpendicular to the direction in which the core insertion groove 13 is formed.

Next, the C-shaped core 15 and the 1-type core 16 are butt-joined into this core insertion groove 14, and a non-magnetic material is interposed in the gap between the joined parts to form a magnetic gap 17!Magnetic core 18!
Insert this magnetic core 18 into the slider 11 with glass,
It is fixed with adhesive, synthetic resin, etc.

After that, the coil is passed through the winding window 19 from the winding groove 13.
It is wound around a mold core 16, and the surface 20 in contact with a magnetic recording medium (not shown) is lapped to a predetermined flat surface to complete the magnetic head.

However, in the conventional magnetic head manufacturing method described above, the slider shape is formed from the material by processing means such as cutting, cutting, polishing, etc., which causes the following problems.

(2) Each of the rails 12) winding grooves 13 and core insertion grooves 14 must be specially ground before the magnetic head is completed, resulting in a complex machining process and a large number of man-hours.

■Since all of the above steps are performed by machining, it is difficult to ensure dimensional accuracy.

■Due to wear and tear on the machining tools, sliders with the same dimensional accuracy, that is, consistent, cannot be produced.

"Objective of the Invention" An object of the present invention is to provide a method for manufacturing a magnetic head that has a simple processing process, eliminates the need for a joining process between a magnetic core and a slider, and can manufacture a highly accurate magnetic head. shall be.

"Summary of the Invention" The present invention fundamentally changes the concept of manufacturing a magnetic head, in which a slider is formed by cutting out a block material, grinding, etc., and a magnetic core is bonded to the slider.

That is, in the present invention, a magnetic core is placed in a predetermined position in a mold that is processed into a shape corresponding to the outer shape of a slider constituting a magnetic head, and molten glass with a low melting point is placed in this mold. It is characterized in that a slider is formed by pouring and cooling, and the slider and magnetic core are integrated with this slider-forming glass to manufacture a magnetic head.

Embodiments of the Invention Examples of the method for manufacturing a magnetic head according to the present invention will be described below with reference to the drawings, taking a floating magnetic head as an example.

A first embodiment of the invention is shown in FIGS. 1-4. This embodiment is an example of manufacturing a magnetic head of a type in which a magnetic core protrudes from a slider. In this embodiment, a slider forming mold 30 is used as a mold for forming the slider 11. Slider forming mold 30
is processed into a shape corresponding to the outer shape of the slider 11, and its bottom is the surface on which the contact surface 20 is formed. This slider forming mold 3o is composed of a split mold that can be divided, for example, at the broken line portion A in FIG. A closing portion 32 having the same shape as the winding window 19 is formed at a portion of the slider forming mold 30 corresponding to the magnetic core 18 in the broken line portion A to prevent molten glass 31 from flowing into the winding window 19 of the magnetic core 18. ing.

Next, a method of manufacturing a magnetic head using the slider forming mold 301Fr will be described.

In the magnetic core 18, a C-shaped core] 5 and a type 1 core 16 are butt-jointed in advance, and a magnetic gap 17 is formed in the gap between the butted portions with high melting point glass interposed therebetween.

First, the magnetic core 18 is positioned and arranged so that the type 1 core 16 is located inside the slider forming mold 3o. At this time, the closing portion 32 closes the winding window 19 so that the molten glass 31 does not flow into the winding window 19.

Next, molten glass 31 is poured into the slider forming mold 30. The molten glass 31 has a lower melting point (for example, about 350° C.) than the high melting point glass that is interposed in the magnetic gap 17.

After cooling in this state, the slider forming mold 30 is removed, and the slider 11 of the desired shape is formed.
1 and the magnetic core 18 are integrated.

In the final finishing step, the contact surface 20 is lapped and a coil is wound around the magnetic core 18 to complete the magnetic head.

In this way, according to the manufacturing method of the present invention, the magnetic core 18
A magnetic head in which the slider 11 and the magnetic core 18 are integrated can be completed by simply placing the molten glass 31 at a predetermined position in the slider forming mold 30 and cooling it by pouring the molten glass 31 into the slider forming mold 30. As in, slider 11
The process of forming the core insertion groove 14 of the magnetic core 18 and the process of joining the slider 11 and the magnetic core 18 can be omitted. Furthermore, since the magnetic head can be formed without grinding, a highly accurate magnetic head with uniform dimensions can be obtained.

A second embodiment of the invention is shown in FIGS. 5-9. This embodiment is an example of manufacturing a magnetic head having a winding groove 11 having the same shape as the magnetic head shown in the conventional example. In this embodiment, a slider forming die 40 and a groove forming die 41 are used as the molds. Slider forming mold 4o
is formed into a shape corresponding to the outer shape of the slider 11 excluding the winding groove 13, and its bottom is the surface on which the contact surface 20 is formed. Further, the groove forming mold 41 is fitted into the slider forming mold 40 so as to be slidable in the direction of the arrow, and is configured as a split mold that can be divided at, for example, a broken line portion B. This groove forming mold 41
has a groove forming convex portion 42 for forming the winding groove 13 at its tip, and a closing portion for preventing the molten glass 31 from flowing into the winding window 19 of the magnetic core 18 at the broken line portion B. 4
I have 3.

Below are the above two molds 40.411F! , the method of manufacturing the magnetic head used will be explained.

First, with the winding window 19 of the magnetic core 18 fitted into the closing part 43 of the groove forming die 41, the groove forming die 41 is fitted into the slider forming die 40, and the groove forming die 41 is placed at a predetermined position in the direction of the slider forming die 4o. position the magnetic core 18 within the slider forming mold 40. Now, the winding window 19 is closed by the closing part 43, and the winding window 19 of the molten glass 31 is closed.
This prevents the inflow into the area.

Next, a low melting point molten glass 3 is placed in the slider forming mold 40.
When the slider forming mold 40 is filled with the molten glass 31 into which the molten glass 1 is poured, the winding groove 13 which becomes a winding guide part is formed by the groove forming convex part 42.

After cooling in this state, the slider forming die 40 and the groove forming die 41 are removed.The slider 11 and the magnetic core 18 are now integrated, and the winding groove 13 is formed in the slider 11 at the same time.

The subsequent polishing process of the contact surface 2o and the winding of the coil around the type 1 core 16 are the same as in the first embodiment, and therefore their explanation will be omitted.

In this way, according to the second embodiment, the step of grinding the winding groove 13 can also be omitted, making it possible to extremely simplify the manufacturing process.

A third embodiment of the invention is shown in FIGS. 10-13. This embodiment is an example for manufacturing a magnetic head of a type in which the magnetic core 18 is projected onto the slider 11 on the side opposite to the contact surface 2°. As the molds, a slider forming mold 50 and a step forming mold 51 are used.

Further, as the magnetic core 18, a pair of L-shaped cores 52.5
High melting point glass is interposed in the gap at one abutting portion of the two cores in which the two cores are joined, forming a magnetic gap 178. The slider forming die 50 mainly forms the rails 12 of the slider 11, and the step forming die 51 forms the winding steps 54 of the slider 11. Further, the step forming mold 51 is configured as a split mold that can be slid in the direction of the arrow and can be divided, for example, at the broken line portion C. A closing portion 55 is formed to prevent the molten glass 31 from flowing into the line window 19.

The method of manufacturing the magnetic head according to this embodiment is similar to that according to the second embodiment. That is, the magnetic core 18 is positioned in the slider forming mold 50 with the winding window 19 of the magnetic core 18 closed by the closing part 55 of the step forming mold 51, and the molten glass 31 is placed in the slider forming mold. 50, cooling of the molten glass 31, removing the slider forming mold 50 and step forming mold 51, lapping the contact surface 20, and winding the coil around the L-shaped core 52.
This is carried out in the same manner as in the embodiment, and thus a magnetic head in which the magnetic core 18 and the slider 11 are integrated is completed.

Although the above embodiments have all been explained using a floating magnetic head as an example, they can also be applied to a method of manufacturing a magnetic head for a flexible disk.

"Effects of the Invention" As explained above, according to the method for manufacturing a magnetic head of the present invention, a magnetic core is positioned and arranged at a predetermined position of a mold formed into a shape corresponding to the outer shape of a slider, After pouring low melting point molten glass into this mold, it is cooled to form a slider, and this slider and magnetic core are integrated, which greatly simplifies the manufacturing process of the magnetic head and reduces the size. It becomes possible to manufacture a high-precision magnetic head with no variation. Further, since the low melting point molten glass for forming the slider functions as a bonding material with the magnetic core, it is also possible to eliminate the need for a step of bonding the magnetic core and the slider, which is required in conventional manufacturing methods.

[Brief explanation of the drawing]

FIG. 1 is a sectional view taken along the line I-X in FIG. 2, showing a mold used in a first embodiment of the method for manufacturing a magnetic head according to the present invention and a magnetic core arranged in the mold; 2 is a plan view of FIG. 1, FIG. 3 is a sectional view taken along line I[[-I[1] of FIG. 2, and FIG. 4 is a perspective view of the magnetic head manufactured according to the first embodiment. FIG. 5 is a sectional view taken along the line V-v in FIG. 6 showing a mold used in the second embodiment of the method of the present invention and a magnetic core placed in the mold. 5 is a plan view, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, FIG. M8 is a sectional view taken along the line ■-■ in FIG. Perspective view of a magnetic head, No. 10
The figure shows the mold used in the third embodiment of the method of the present invention and the magnetic core arranged in the mold, and the X in FIG.
11 is a plan view of FIG. 10, FIG. 12 is a sectional view taken along the double-■ line in
The figure is a perspective view of a magnetic head manufactured according to the third embodiment.
FIG. 14 is a perspective view showing a step of joining a slider with a magnetic core in a conventional method of manufacturing a magnetic head. 11--Slider, 13--Winding groove, 14--Core insertion groove, 17--Magnetic gap, 18--Magnetic core, 19--Winding window, 20--Contact Face, 30, 40
．． 50-... slider forming mold, 31... molten glass,
32,43.55...Closing part, 41...Groove forming type,
42--Groove forming convex portion, 51-Single step portion forming mold. Patent applicant Alps Electric Co., Ltd. Agent
Miura Kunijindo Shigeha Matsui Nami To's taste Nami Okazaki Aji core

Claims (2)

[Claims] (1) The magnetic core is positioned and placed in a predetermined position in a mold that has been processed into a shape that corresponds to the outer shape of the slider that makes up the magnetic head, and after pouring low melting point molten glass into the mold, it is cooled. A method of manufacturing a magnetic head, characterized in that a slider made of the low melting point glass and a magnetic core are integrated. (2) In claim 1, the mold includes a first mold for molding a slider portion, and a convex portion that closes a winding window of the magnetic core and forms a winding guide portion of the slider. and a second mold that slides within the first mold.