JPH06150224A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To provide a magnetic head and its manufacture making the bonding strength of core blocks strong and reducing the inductance. CONSTITUTION:A plurality of square rod-like child substrates 31 of non-magnetic bodies and a plurality of square rod-like mother substrates 32 formed with non-magnetic bodies and having storing grooves 33 for storing the child substrates 31 formed every constant pitch at one end faces are used. A magnetic film 22, and a glass film 35 are sequentially applied and laminated on the side faces of the mother substrates 32, and the child substrates 31 are fitted into the storing grooves 33 of the mother substrates 32, thereby, to combine the child and mother substrates 31, 32 in matrix. Then, the child substrates 31 are fused by means of a glass with the mother substrates 32, so that the mother substrates 32 are coupled and bonded each other via the child substrates 31 into one body. Subsequently, the mother substrates 32 are sliced at a predetermined pitch in the longitudinal direction. As a result, core blocks 41, 41' in which the sliced child substrates 31 are partially fitted at corners of one side of the sliced faces of the mother substrates 32 in the longitudinal direction are obtained.

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 VTR device or the like and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, a core chip (1) constituting a magnetic head used in a VTR device or the like has a metal layer (2) made of a magnetic material and a non-magnetic substrate (3) (3). ) A pair of cores (4)
(4 ') is joined and integrated by facing the metal layer (2), and a magnetic gap is formed on the medium sliding contact surface (5), which is manufactured in the manner shown in FIGS. 7 to 9.

That is, as shown in FIG. 7, a plurality of rectangular rod-shaped substrates made of a non-magnetic material such as ceramics having a magnetic film (2 ') and a glass film (11) sequentially deposited on one side by sputtering. (12) are aligned and held on a jig (13), pressed in the alignment direction by a pressing member (14), and are adjacent to each other by a glass film (11) that is heated and melted by an appropriate heating means. The substrates (12) are joined together to form a metal layer (2) between the substrates (12) as shown in FIG. Next, at the position shown by the alternate long and short dash line in FIG. 8, each bonded substrate (12) is sliced at a constant pitch in the longitudinal direction to cut out the core block (15). Then, as shown in FIG. 9, the pair of cut out core blocks (15).
The surfaces (16) and (16) of (15) are abutted and integrated with each other through a non-magnetic thin film (not shown) such as SiO 2 serving as a gap spacer.

Next, after the winding window (A) locking groove is formed, the pair of integrated core blocks (15) (15) are
As indicated by the chain double-dashed line in FIG. 9, the metal layer (2) is sliced at a constant pitch along the widthwise direction thereof and in a direction parallel to the metal layer (2) so that the metal layer (2) has a predetermined thickness. The core chip (1) is cut out so as to be included in.

[0005]

According to the prior art,
The substrate (12), which is a non-magnetic material, is in the shape of a square rod, and therefore is difficult to deform. Therefore, if the substrates (12) are warped or the like, a gap is generated between the substrates (12) when the substrates (12) are aligned, and the jigs (13) cause the plurality of substrates (12) to be aligned. Even if pressure is applied in the alignment direction, the gap between the substrates (12) cannot be closed. Therefore, there was a problem that the substrate (12) could not be bonded uniformly, the bonding strength was weak, and the substrate (12) bonded via the metal layer (2) was peeled off. In addition, the substrate (1
Since 2) is difficult to deform, the number of substrates (12) to which the pressing force of the jig (13) is applied is limited, which reduces the number of core chips that can be manufactured in one process.
There was a problem of poor productivity of core chips.

Further, the core chip (1) having the above structure is
Since the metal layer (2) is formed over the entire width direction of the medium sliding contact surface (5), when the magnetic head is manufactured using the core chip (1), the metal layer (2) of the medium sliding contact surface (5) is formed.
However, there is a problem that the width dimension L of the magnetic head becomes large, and thus the inductance of the magnetic head becomes high.

The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a magnetic head in which the adhesive strength of a pair of core blocks is high and the inductance is low, and a manufacturing method thereof. There is.

[0008]

In order to achieve the above object, the present invention provides a pair of cores comprising a metal layer made of a magnetic material sandwiched by non-magnetic substrates. In a structure in which they are opposed to each other and integrally joined, and a magnetic gap is formed in the medium sliding contact surface, cutouts are formed in both side corners of the pair of cores on the medium sliding contact surface side, and the nonmagnetic block is formed in the cutouts. It is fitted and fixed.

According to a second aspect of the present invention, a plurality of storage grooves capable of storing the square bar-shaped non-magnetic substrate are formed on one end face of each longitudinal side of the plurality of square bar-shaped mother substrates made of a non-magnetic material. In a uniform pitch, and a step of laminating and depositing a magnetic film and a glass film for welding on one side of the mother substrate, the mother substrate is superposed, and the subsidiary substrates are fitted and housed in their respective storage grooves. A step of combining the mother board and the child board in a lattice pattern, placing the glass for welding on the child board and heating the mother board under pressure,
The step of melting the glass film and glass, joining the mother substrates to each other by joining the mother substrates by joining and integrating the substrates, and polishing and removing the glass, and then slicing the mother substrate at a predetermined pitch in the longitudinal direction of the mother substrate. And a step of forming a core block in which a daughter board sliced at one corner of a longitudinal slice surface is partially fitted.

[0010]

According to the first aspect of the invention, the width of the metal layer formed on the medium sliding contact surface of the magnetic head is narrowed and the inductance is lowered.

Further, according to the second aspect of the present invention, since the storage groove is formed in the mother substrate to form the comb teeth, the mother substrate is easily deformed in the alignment direction, and the mother substrate is stored in the mother substrate. Since the sub-boards that are combined and fitted in the grooves in a lattice shape are connected and fixed, the respective mother boards have high adhesive strength, and the mother boards are evenly adhered and do not peel off.

[0012]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

In FIG. 1, reference numeral (21) is a core chip constituting a magnetic head, and the core chip (21) has a metal layer (22) made of a magnetic material and a non-magnetic substrate (23).
A pair of cores (24) (2) sandwiched by (23)
4) The metal layers (22) are made to face each other and joined together to form a magnetic gap in the medium sliding contact surface (25), and the medium sliding contact surface (2) of the pair of cores (24) (24) is also formed.
Notches on both side corners on the 5) side, and the notches (26) (2
6 ') is a square rod-shaped connecting block (2
7) (27 ') is fitted and adhered via glass,
Each non-magnetic substrate (23) of a pair of cores (24) (24)
(23) is a metal layer (22) and a connection block (27)
It is adhesively fixed via (27 ').

The core chip (21) is shown in FIGS.
It is manufactured according to the procedure shown in. 2 to 5, (3
1) is a plurality of rectangular bar-shaped child substrates made of a non-magnetic material such as ceramics, and (32) is a plurality of rectangular bar-shaped mother substrates made of a non-magnetic material such as ceramics. A plurality of storage grooves (33) for storing the sub-board (31) are provided on the side end surface.
Are formed in a constant pitch in a comb-tooth shape, and convex portions (34) are provided between the storage grooves (33).

Then, as shown in FIGS. 2 and 3, a mother substrate (32) having a magnetic film (22 ') and a glass film (35) sequentially deposited on one side by sputtering is aligned and held. The sub-board (3) is placed in the storage groove (33) of the motherboard (32).
By inserting 1), a plurality of mother boards (32) and a plurality of daughter boards (31) are combined in a grid pattern.

The child board (3
1) and the mother board (32) as shown in FIG.
6) It is aligned and held on the glass substrate, and glass (not shown) is placed on the child substrate (31). After that, the child board (3
1) While heating the mother substrate (32), the pressing member (3
The mother substrate (32) is pressed by 7) in the alignment direction. Then, the glass film (35) in which the adjacent mother substrate (32) is melted
4, the metal layer (22) is formed between the mother substrates (32) as shown in FIG. 4, and the glass placed on the daughter substrate (31) is melted to form the mother substrate (32). Glass is poured into the gap between the child board (31) and the child board (3
1) is welded and fixed to the mother substrate (32) and the wafer (3
8) is formed.

When pressure is applied to the mother substrate (32) in the alignment direction, the mother substrate (32) has a storage groove (3) formed on one surface thereof at a constant pitch.
3) is formed, the convex portion (34) serves as a free end and is easily deformed in the alignment direction of the mother substrate (32). Therefore, even if there is a gap between the adjacent mother substrates (32), it can be cured. The gap between the mother substrates (32) is closed by the pressing force of the tool (36), the adjacent mother substrates (32) are reliably and uniformly adhered, and the adjacent mother substrates (32) are each a subsidiary substrate. Since it is glued and connected and fixed by (31),
The adhesive strength is extremely strong.

Thus, the mother board (32) and the child board (31)
When the grid-shaped adhesive bonding is performed, the convex portions (3
The core block (41) is obtained by slicing the mother substrate (32) at a constant pitch in the longitudinal direction so that 4) is divided into left and right.
Cut out (41 '). Then, as shown in FIG. 5, the surfaces (42) and (42 ′) of the pair of cut out core blocks (41) and (41 ′) serve as gap spacers.
These are abutted and integrated through a non-magnetic thin film (not shown) such as.

Next, after the winding window (A) is formed, the pair of integrated core blocks (41) (41 ') is shown in FIG.
As shown by the two-dot chain line in the figure, at a constant pitch in the longitudinal direction,
And slice in the direction parallel to the metal layer (22),
The core chip (21) is cut out so as to include the metal layer (2) portion with a predetermined thickness.

The core chip (2
1) is a connection block (27) (27 ') formed by a child board in which both sides of a medium sliding contact surface (25) are sliced.
Since the metal layer (22) is exposed only at the substantially central portion of the medium sliding contact surface (25) and the width dimension M becomes small, a magnetic head is manufactured by the core chip (21). , The inductance is low.

[0021]

According to the present invention, since the mother substrates are easily deformed in the alignment direction and are joined in the state where they are connected and fixed by the daughter substrates, the adjacent mother substrates can be adhered to each other without a gap. The adhesive strength of the substrate is significantly increased. Therefore, the mother substrates are not separated from each other, and more mother substrates can be bonded to the jig during manufacturing in comparison with the conventional method, and the number of core chips that can be manufactured in one process increases. , Productivity is improved.

Moreover, the width of the metal layer on the medium sliding contact surface of the core chip is reduced, and the inductance is reduced.
Higher performance of the core chip can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a core chip of a magnetic head of the present invention.

FIG. 2 is a perspective explanatory view showing an embodiment of a manufacturing method according to the present invention.

FIG. 3 is a side view showing a procedure for pressing a mother substrate.

FIG. 4 is a perspective view showing a state in which the child board and the mother board shown in FIG.

5 is a perspective view showing a pair of core blocks that are cut out from the mother board and the mother board shown in FIG.

FIG. 6 is a perspective view of a core chip of a conventional magnetic head.

FIG. 7 is a side view showing the procedure for pressing the substrate.

FIG. 8 is a perspective view showing a conventional manufacturing method.

9 is a perspective view showing a pair of core blocks obtained by cutting out and joining the substrate shown in FIG.

[Explanation of symbols]

 21 core chip 22 metal layer 22 'magnetic film 25 medium sliding surface 26, 26' notch 27, 27 'connecting block 31 child substrate 32 mother substrate 33 storage groove 35 glass film 41, 41' core block

Claims (2)

[Claims] 1. A pair of cores in which a metal layer made of a magnetic material is sandwiched by non-magnetic substrates are joined and integrated with the metal layers facing each other, and a magnetic gap is formed on the medium sliding contact surface. A magnetic head, characterized in that notches are formed at both corners of a pair of cores on the medium sliding contact surface side, and nonmagnetic blocks are fitted and fixed to the notches. 2. A plurality of accommodating grooves capable of accommodating the rectangular rod-shaped non-magnetic child substrates are formed at a constant pitch in a comb-like shape on one end face of each longitudinal side of a plurality of rectangular rod-shaped mother substrates made of a non-magnetic material. With
The step of laminating and depositing the magnetic film and the glass film for welding on one side of the mother substrate, the mother substrates are superposed, and the mother substrates are fitted and housed in the respective storage grooves to form the mother substrate and the mother substrate. Step of combining in a lattice shape, placing the glass for welding on the child substrate, heating the mother substrate under pressure, melting the glass film and glass, and joining and joining the mother substrates by the child substrate After the step of integrating and polishing and removing the glass, the mother substrate is sliced at a predetermined pitch in the longitudinal direction, and the sliced child substrate is partially fitted to one side corner of the longitudinal slice surface of the mother substrate. A method of manufacturing a magnetic head, which comprises the step of forming a core block.