JPH01143007A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To prevent exfoliation of a thin metallic film by depositing and forming the thin metallic film on the inner side face of a 2nd core block and butt-joining and integrating this core block to a 1st core block, then forming 2nd track grooves on the peak end faces of the 1st and 2nd core blocks. CONSTITUTION:Many 1st track grooves 23 are formed, except a track width T1, on the inner side face of the 1st core block 20 along the short side direction thereof. On the other hand, the thin metallic film 25 consisting of a ferromagnetic material is deposited and formed on the inner side face of the 2nd core block 21. The inner side faces of this core block and the 2nd core block 21 are butt- joined to each other and are integrated to one body. The many track grooves 29 are formed, except the width T2 larger than the 1st track width T1, on the peak end faces of the 1st and 2nd core blocks along the short side direction thereof. After glass molding of the 2nd track grooves 29, the 1st and 2nd core blocks are sliced by each of the 2nd track grooves along the short side direction thereof. The exfoliation of the thin metallic film 25 at the time of forming the 2nd track grooves 29 is thus obviated.

Description

[Detailed description of the invention] The emperor of industry rises! The present invention relates to a method of manufacturing a magnetic head.
The present invention relates to a method of forming track grooves in a magnetic head used in D devices and the like.

For example, a magnetic head used in an FDD device has a read/write gap for writing and reading information on a magnetic disk, which is a recording medium, and a recording track written by this read/write gap. It was common to have an erase gap for trimming. With the magnetic head described above, even if the magnetic head is misaligned with respect to the magnetic disk, information can be accurately reproduced using the read/write gap. On the other hand, in recent years, with the further development of servo technology, it has become possible to accurately position the magnetic head relative to the magnetic disk.As a result, even for FDDs using magnetic disks, single gap A magnetic head having a magnetic head has been put into practical use. This magnetic head has one magnetic gap with different track widths, and by making the track widths different,
This is intended to absorb as much as possible the positioning error of the magnetic head relative to the magnetic disk.

M that adopts the above structure and is used for high-density recording.
A specific example of an IG (Metal in Gap) head will be described with reference to FIGS. 9 and 10.

In the magnetic head shown in the figure, (1) is a core chip made of ferrite, which is a ferromagnetic material, and a pair of first and second core chips.
The core chip (1), which is made by integrally bonding the cores (2) and (3) with low-melting glass (4) and (4), has a top end surface (5) that comes into sliding contact with the magnetic/magnetic disk that is the recording medium. teeth,
Magnetic gaps g having different track widths are formed, and the magnetic gaps g are protected from both sides with glasses (4) (4). In this magnetic gap g, as shown by the arrow in the figure, the first core (2) on the leading side of the rotating magnetic disk, which is relatively ahead of the magnetic head in the circumferential direction. than the track width (T1),
The track width (T) of the second core (3) on the trailing side that follows the running of the magnetic disk is set large. (6) is the second core (3) located in the magnetic gap g.
A thin metal film formed on the edge of the core chip (1) made of a ferromagnetic material having high saturation magnetic flux density characteristics such as sendust or permalloy (not shown).
7) An insulating coated wire wound with a predetermined number of turns is attached to (8), a back core is attached, and sliders are attached and fixed on both sides of the core chip (1) using epoxy resin adhesive. .

Next, a conventional method of manufacturing the magnetic head will be described with reference to FIGS. 11 to 14. First, as shown in FIG. 11, rectangular parallelepiped-shaped first and second core blocks (9) and (10) made of ferrite, which is a ferromagnetic material, are prepared. And the inner surface (1) of the second core block (10)
As shown in FIG. 12, a metal thin film (11) is deposited on 0a) by vapor-depositing or sputtering a ferromagnetic material such as sendust or permalloy having high saturation magnetic flux density characteristics. The inner surface of the block (9) (9a
) with a plurality of first track grooves (12) (12) leaving a first track @(T1) along its transverse direction.
・ At the same time, a second track width (T2) larger than the first track width (T1) is cut on the inner surface (10a) of the second core block (lO) along its short direction.
) with a plurality of second track grooves (13) (13)
Cutting... Then, as shown in FIG. 13, the inner surfaces (9a) and (10a) of the first and second core blocks (9) and (10) are glass molded to form eleventh and second track grooves (12)...(13). )... are filled with low-melting glass (14)...(15)... Although not shown, StO, which serves as a gap spacer, is provided on the inner surface (9a) of the first core block (9). After depositing and forming non-magnetic thin films such as
) are butted together and heated and welded to integrate them. Then, as shown by the broken line in the figure, the first and second core blocks (9)
(1G) is cut and removed, and then the first and second core blocks (9) (1
0) into the first and second track grooves (12)...-(13)
9 and 10.
A core chip (1) shown in the figure is obtained.

By the way, in the conventional manufacturing method, the second core block (first
After forming the metal thin film (11) on the inner surface (10a) of the metal thin film (11), the second track grooves (13) (13)... are cut. )
Disadvantageously, there was a problem in that it easily peeled off from the second core block (10).

In addition, both the first and second core blocks (9) (10) have first and second track grooves (12)...-(13)...
The first and second track grooves (12)...
(13) , . . . are magnified and visually checked with a microscope etc., and the first and second core blocks (9) (10) are carefully aligned.
There was also the problem that there was a high possibility that track misalignment would occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a magnetic head using simple means that prevents peeling of a metal thin film and eliminates the possibility of track deviation.

The present invention has been proposed in view of the above-mentioned problems, and includes forming a large number of first track grooves on the inner surface of the first core block, leaving a first track width along the width direction of the first core block. a step of depositing a metal i film made of a ferromagnetic material having high saturation magnetic flux density characteristics on the inner surface of the second core block;
a step of joining and integrating the first and second core blocks by abutting their inner surfaces; After forming a large number of second track grooves leaving a track width of 2, and glass molding the second track grooves, the first and second core blocks are formed along the width direction of each second track groove for each second track groove. This is a method for manufacturing a magnetic helad that achieves the above object by including a slicing step.

According to the present invention, after forming a metal thin film on the inner surface of the second core block, the first and second core blocks are coated on the inner surface of the second core block without forming a track groove on the second core block. Butt and join to integrate. After that, the first
A second track width is formed in the second core block by machining a second track groove on the top end surface of the second core block by cutting or the like. This prevents the metal thin film of the second core block from being pressed by the first core block and peeling off, and also eliminates the need to align the first and second core blocks when butting them together.

An embodiment of a method for manufacturing a magnetic head according to the present invention will be described with reference to FIGS. 1 to 8.

First, as shown in Fig. 3, first and second core blocks (20) each having a rectangular parallelepiped shape are made of ferrite, which is a ferromagnetic material.
Prepare (21). Then, as shown in Figure 4, the first
A joining V-groove (22) is cut in the longitudinal direction of the inner surface (20a) of the core block (20), and a plurality of first tracks @ (Tx) are cut along the transverse direction. Track grooves (23) (23)... are cut.Meanwhile, the inner surface (21a) of the second core block (21) is machined.
) along its longitudinal direction to form a bonding V-groove (24), and a gold aS film (25) is coated by vapor depositing or sputtering a ferromagnetic material having high saturation magnetic flux density characteristics such as sendust or permalloy. Form a deposit.

Next, as shown in Fig. 5, the inner surface (2
0a) is glass molded, and high melting point glass (
26) and polish its inner surface (20a) to a mirror finish. On the other hand, although not shown, an interlayer film compatible with glass is deposited on the thin metal Ill (25) on the inner surface (21a) of the second core hub (21) by sputtering or the like, and then molded with a glass mold to have a high melting point. A glass film is laminated on the metal thin film via an intermediate film, and the high melting point glass (27) is filled in the groove (24), and the inner surface (2
1a) Mirror finish. Note that the above-mentioned formation of high melting point glass on the metal thin film is a means to protect the metal thin film, but the formation of this high melting point glass film and intermediate film is not necessarily necessary and may be omitted. It is possible.

Next, although not shown, after forming a non-magnetic i film such as SiO2 to serve as a gap spacer on the inner surface (20a) of the first core block (20), as shown in FIG.
, the second core blocks (20) and (21) are attached to their inner surfaces (2
0a) and (21a) are butted against each other and heated and welded to integrate them. Then, as shown in FIG. 7, the first track width ( A plurality of second track grooves (29) (29) -... with a second track width (T2) larger than T2 remaining.
Cutting.

Next, as shown in FIG. 8, the first and second core blocks (
20) Glass mold the top end surface (28) of (21), fill the second track groove (29) (29)... with low melting point glass (30) (30) ---, and rough-pipe the top end surface. do. At this time, the first core block (2
0) first track groove (23) (23)...
Since the glass mold is made of high melting point glass (26), the above-mentioned first and second core blocks (20)
Second track groove (29) in (21) (29)...
During glass molding, the high melting point glass (26) of the first core block (20) does not melt and there is no risk of track misalignment. After that, the first
, the second core block (20) (21) is cut and removed at the center 7 of the lower part, and the first and second core blocks (20) (21) are cut along the widthwise direction of the first and second core blocks (20) (21) as shown by the chain lines in the figure. Slice at a fixed pitch every two track grooves (29) (29)...

By going through the manufacturing process as described above, Figures 1 and 2 are produced.
A core chip (31) shown in the figure is obtained.

This core chip (31) has a first track width (T1) on the first core (32) on the leading side and a metal thin film (34) on the second core (33) on the trailing side.
a magnetic gap g consisting of a second track width (T2) of
high melting point glass (35) (35) (high melting point glass (2B) (26) in the first track groove (23) shown in FIG. 8) on both sides of the first track width (T1).
), low melting glass (36) (36) (low melting glass (30) in the second track groove (29) shown in FIG. 8) is arranged on both sides of the second track width (T2). . Although not shown, the legs (37) of the core chip (31)
) (38) is equipped with an insulating coated wire wound a predetermined number of turns, a back core is attached to complete the closed magnetic circuit, and sliders are fixed on both sides of the core chip (31). This slider is the core chip (3
It is now possible to fix by welding using the low melting point glass (36) (36) of 1), and there is no need to separately prepare an adhesive material as in the past.

Although the above embodiment describes a magnetic head used in an FDD device, the present invention is not limited thereto, and can be applied to magnetic heads used in other magnetic recording devices such as fixed disk devices. Of course it is.

According to the method of the present invention, a thin metal film is deposited on the inner surface of the second core block, and the first and second core blocks are joined by butting their inner surfaces together. 1st and 2nd above
Since the second track groove is formed on the top end surface of the core block, the metal thin film does not peel off when the second track groove is formed, and when the first and second core blocks are brought together, the track groove is Since there is no need to align the grooves, work efficiency is greatly improved, and there is no possibility of track misalignment, which greatly improves reliability and yield, making it possible to provide a high-quality magnetic head.

[Brief explanation of the drawing]

1 to 8 are for explaining one embodiment of the method of the present invention. FIG. 1 is a perspective view showing a core chip of a magnetic head manufactured by the method of the present invention, and FIG. The plan view and FIGS. 3 to 8 are perspective views showing the first and second core blocks in each step. FIG. 9 is a perspective view showing a core chip of a magnetic head manufactured by a conventional manufacturing method, and FIG. 10 is a plan view of FIG. 9. 11 to 14 are perspective views showing the first and second core blocks at each step for explaining the method of manufacturing the head shown in FIG. 9. FIG. (2G) (21) --- First and second core blocks,
(20a) (21a)...Inner surface, (23
)---First track groove, (25)---Metal thin film, (28)---Top end surface, (29)---Second track groove, (32)---First core , (33)・-・Second
Core, (34) ---metal *II! , (TI)(Tz)--first and second track widths. Patent applicant: Kansai NEC Co., Ltd.
Rihito Gangwon Province Go1・-1
--1.Zo 1 Figure 2 Figure 9 Figure 10

Claims (1)

[Claims] (1) A step of forming a large number of first track grooves on the inner surface of the first core block with a first track width left along its transverse direction, and a high saturation magnetic flux density on the inner surface of the second core block. a step of depositing and forming a metal thin film made of a ferromagnetic material having characteristics; a step of joining and integrating the first and second core blocks by butting their inner surfaces together; forming a large number of second track grooves on the top end surface leaving a second track width larger than the first track width along the width direction; 1. A method for manufacturing a magnetic head, comprising: slicing the second core block for each second track groove along its transverse direction.