JPH1091915A - Magnetic head and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of electric discharging noise by bending the magnetic core, that consists of a metallic magnetic material, at a head chip side face and electrically connecting the magnetic core which is opposed through a head base. SOLUTION: The magnetic head, having a ring shape is formed by sticking the head chip, in which one side face among four side faces is made as a tape sliding surface, on a had base. The metallic magnetic core is bent at the side face other than the sliding surface of the head chip and the end face of the core is made to the same surface of the head chip stuck surface. In other words, the metallic magnetic core 1, which is held by a nonmagnetic base plate 2 from both sides, the butted through a gap spacer and is fixed by a glass 5. Moreover, the core 1 is bent at the side surfaces. The end section of the bent core 1 contacts with a metallic head base 6. The core 1 which is butted through the gap, is electrically connected through the base 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, as the image quality of VTRs and the like has been improved, the coercive force of magnetic tapes has been increased. In order to respond to the magnetic head, it is necessary to increase the magnetic flux density of the magnetic core,
Metallic magnetic materials have been used. In a magnetic head using a combination of a metal magnetic material and a ferrite, the sliding noise of the ferrite becomes a problem. Therefore, as shown in FIG. 9, a ring having a structure in which a magnetic core made of a metal magnetic material is sandwiched between non-magnetic substrates from both sides. Shaped magnetic heads have been developed.

In the magnetic head having the above-described structure,
It is known that when a non-magnetic substrate sandwiching a metal magnetic core is an insulator, the non-magnetic substrate is charged and sliding noise occurs when sliding with a tape. This discharge is generated between the gaps due to a potential difference caused by a difference in the amount of charge charged on two metal magnetic cores facing each other via the magnetic gap film. It has been found that as a countermeasure, two opposing metal magnetic cores may be electrically connected.

[0004] Examples of countermeasures found in the conventional magnetic head will be described below with reference to FIGS. 9 and 10.

FIG. 9 is a perspective view showing the configuration of a magnetic head disclosed in the invention described in Japanese Utility Model Publication No. 62-41377. A metal magnetic core 1 is sandwiched between non-magnetic substrates 2 and a winding window is provided. 3 is joined by a glass 5 via a gap spacer 4, and a conductive adhesive 15 is used for bonding to a head base 6. Is in contact with

[0006] FIG.
FIG. 1 is a perspective view showing the configuration of a magnetic head disclosed in the invention described in Japanese Patent Laid-Open No. H10-210, in which a metal magnetic core 1 is sandwiched between non-magnetic substrates 2 and a winding window 3 is formed via a gap spacer 4. And joined by glass 5
In order to electrically connect two metal magnetic cores 1 facing each other via a gap, a metal thin film 16 is formed on the surface opposite to the tape sliding surface by means of sputtering or the like, and is made possible. It is.

[0007]

However, in the conventional example shown in FIG. 9, the head chip is adhered to the head base by the conductive adhesive 15, but the adhesive force of the conductive adhesive is low. However, it is weaker than general adhesives, and tends to have poor reliability of adhesive strength. Further, when the metal magnetic core 1 is thin, depending on the size of the conductive particles of the conductive adhesive, complete conduction is not necessarily achieved. May not be taken.

In the conventional example shown in FIG.
The two metal magnetic cores may not always be able to be electrically connected due to peeling of the metal thin film 16 or bubbles or cracks of the back bonding glass 5a, which poses a problem in reliability.

An object of the present invention is to solve these problems,
An object of the present invention is to provide a magnetic head which is excellent in reliability and suitable for mass production and a method for manufacturing the same.

[0010]

According to the present invention, a metal magnetic core made of a metal magnetic material is bent at a side surface other than the tape sliding surface so that an end surface of the metal magnetic material is in contact with a head chip attaching surface. By attaching a head chip having the same surface structure to a metal head base, the end faces of the metal magnetic core facing each other via the gap are electrically connected to the metal head base, and as a result, two metal magnetic bases are formed. The core is electrically connected.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention has a structure in which a metal magnetic core made of a metal magnetic material is sandwiched between non-magnetic substrates from both sides, and one of four sides is a tape sliding surface. A ring-shaped magnetic head having a head chip attached to a head base, wherein a metal magnetic core is bent on a side of the head chip other than the tape sliding surface, and an end surface of the metal magnetic core is flush with the head chip attaching surface. By sticking to a metal head base,
The metal magnetic body end face is electrically connected by contacting the metal head base, and as a result, the opposed metal magnetic core is electrically connected via the gap.

According to a second aspect of the present invention, after a metal magnetic film is formed on a non-magnetic substrate having a groove, a plurality of sheets are stacked and adhered, one cut surface leaving a step of the groove and the other cut surface. Created a pair of core blocks in which metal magnetic materials and non-magnetic substrates were alternately laminated by cutting portions other than the grooves, and formed a winding window in one of the core blocks. After that, the gap surface of both core blocks is mirror-polished, a non-magnetic thin film is formed on the gap surface to a predetermined thickness, and the two blocks are adhered to each other. By cutting at such a thickness, the head chip according to claim 1 can be produced, and by attaching this head chip to a metal head base, the metal magnetic cores facing each other via the gap are electrically connected. It is intended to be.

According to a third aspect of the present invention, a conductive adhesive is used for bonding the head chip and the head base.
The contact area with the conductive adhesive is large, and the conductive particles of the conductive adhesive surely come into contact with the metal magnetic material, so that the metal magnetic cores facing each other via the gap can be electrically connected.

(Embodiment 1) FIG. 1 is a perspective view showing the configuration of a head chip produced by a method of manufacturing a magnetic head according to Embodiment 1 of the present invention, and FIG. FIG. 2 shows a side view (on the tape sliding surface side).

In FIG. 1, a metal magnetic core 1 sandwiched from both sides by a non-magnetic substrate 2 comprises a gap spacer 4.
And is fixed by the glass 5. A winding window 3 is formed on one side. The metal magnetic core 1 is bent at the side surface, and the end is exposed at the bottom surface of the head chip.

In FIG. 2, a metal magnetic core 1 sandwiched from both sides by a non-magnetic substrate 2
Are fixed by the glass 5 and attached to the metal head base 6. At this time, the end of the bent metal magnetic core 1 comes into contact with the metal head base 6, and the metal magnetic core butted via the gap is electrically connected via the head base 6.

Embodiment 2 A method of manufacturing a magnetic head according to Embodiment 2 of the present invention will be described with reference to FIGS.

FIG. 3 is a perspective view of the non-magnetic substrate before the metal magnetic material is formed, and FIG. 4 is a partial perspective view of the non-magnetic substrate on which the metal magnetic material is formed. FIG. 5 is a manufacturing process diagram for explaining the method for manufacturing a magnetic head according to the present invention.

A groove 7 is formed in the non-magnetic substrate 2 shown in FIG.
On the surface, as shown in FIG. 4, a metal magnetic body 1 is formed by means such as sputtering. At this time, the metal magnetic material 1
Are formed along the shape of the groove 7.

As shown in FIG. 5, a plurality of the above-mentioned sputtered substrates are stacked and bonded with crystallized glass or the like (FIG. 5A). The bonded block is cut along a groove 7 and a cutting line 8 other than the groove. The cut block has a shape as shown in FIG. 4B, and has a shape in which a part of the groove 7 remains. Next, as shown in FIG. 4C, a glass filling notch 9 is formed on the opposite surface where the groove 7 remains.
To process. The notch portion is filled with glass, cut into strips as shown in FIG. 4D, and the block 13 in which the back joining glass groove 10 is processed, and the winding window groove 11 and the back joining glass groove 10 are similarly formed. The processed block 12 is prepared, each gap surface is polished, and a non-magnetic thin film is formed to a predetermined thickness and joined.

FIG. 6 is a perspective view showing the structure of a gapped bar obtained by this manufacturing method.
Block 12 and I-block 1 filled with notch glass
3 shows the result of bonding. In FIG. 6, the metal magnetic core 1 of the gapped bar has a bent shape linearly in the vicinity of the gap and a part of the above-described groove on the side surface of the bar.

The cutting of the head chip from the gapped bar is performed at the position where the end face of the magnetic core bent at the contact section is exposed by cutting along the line 14. FIG. 7 shows a configuration perspective view of a head chip obtained by cutting. The magnetic core 1 is bent on the side surface of the head chip, and the end surface is exposed on the chip bottom surface.

FIG. 8 is a perspective view showing the structure of a head chip of a magnetic head according to another embodiment.

This is characterized in that the magnetic core 1 is bent on the side opposite to the tape sliding surface, and the bent portion does not appear on the tape sliding surface.

[0025]

According to the present invention, as a means for electrically connecting between opposing magnetic cores via a gap, a metal magnetic material is used to prevent the occurrence of discharge noise generated by sliding with the tape. By bending the resulting magnetic core on the side of the head chip, it is exposed on the head chip attachment surface,
By attaching to a metal head base, it is electrically connected via the head base. According to this method, a magnetic head which does not generate discharge noise, is excellent in mass productivity, and has high reliability can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration perspective view of a head chip of a magnetic head according to the present invention.

FIG. 2 is a side view when the head chip is attached to a head base.

FIG. 3 is a perspective view of a non-magnetic substrate before a metal magnetic body is formed.

FIG. 4 is a partial perspective view of a non-magnetic substrate on which a metal magnetic material is formed.

FIG. 5 is a manufacturing process diagram for explaining a method of manufacturing a magnetic head according to the present invention.

FIG. 6 is a configuration perspective view of a gapped bar obtained by the manufacturing method of the present invention.

FIG. 7 is a perspective view showing the configuration of the same head chip.

FIG. 8 is a configuration perspective view of a head chip according to another configuration example of the present invention.

FIG. 9 is a configuration perspective view of a head chip attached to a head base of a conventional magnetic head.

FIG. 10 is a perspective view of the configuration of a head chip according to another configuration example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal magnetic core 2 Nonmagnetic substrate 3 Winding window 4 Gap spacer 5 Glass 6 Head base 7 Groove 8 Plate cutting line 9 Notch groove 10 Glass groove for back bonding 11 Winding window groove 12 C core block 13 I core block 14 Chip core Cutting line 15 Conductive adhesive 16 Metal thin film

Claims (3)

[Claims] 1. A ring-shaped structure in which a metal magnetic core made of a metal magnetic material is sandwiched between non-magnetic substrates from both sides, and a head chip having one of four sides as a tape sliding surface is attached to a head base. A magnetic head, wherein the metal magnetic core is bent at a side surface other than the tape sliding surface of the head chip, and an end surface of the metal magnetic core is flush with the head chip attaching surface. 2. After forming a metal magnetic film on a non-magnetic substrate having a groove, a plurality of sheets are stacked and adhered, and one cut surface leaves a step of the groove and the other cut surface is a portion other than the groove. By cutting, a pair of core blocks in which the metal magnetic material and the non-magnetic substrate are alternately stacked, and a winding window is formed in one of the pair of core blocks, The gap surface of both core blocks is mirror-polished, a non-magnetic thin film is formed on the gap surface to a predetermined thickness, and then adhered to each other, and then the end surface of the metal magnetic film is exposed on one cut surface. A method for manufacturing a magnetic head, characterized in that the magnetic head is cut at an appropriate thickness. 3. The method according to claim 2, wherein a conductive adhesive is used for bonding the head chip and the head base.