JPS583127A - Manufacture for magnetic head - Google Patents

Abstract

PURPOSE:To easily manufacture a composite type magnetic head, by arranging a stepwise part to the interface of a single crysral ferrite block and a poly crystal ferrite block, and forming a reference plane. CONSTITUTION:The length of a single crystal ferrite block 1 is formed smaller than the length of a polycrystal ferrite block 2, the mirror surfaces of both the blocks are mutually butted and heated in an atmosphere including O2 at 1,300 deg.C, bonded with the mutual diffusion to form a composite block 3. A step 4 is formed at both ends of the composite block 3 because of the difference between the length of the blocks and the mirror surface at this step is taken as a reference plane 14. Composite block pieces 6 and 7 are formed by cutting the block at a chain line 5 to form a sendust film 8 on the surface of both the block pieces 6 and 7 with sputtering. Winding grooves and track width restricting grooves 12 are formed on the film surface of the block pieces, a gap spacer is coated on the operating gap forming plane made of single crystal ferrite, both the block pieces are aligned at the reference plane and butted for glass melting.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a composite magnetic head using a head core made by bonding single-crystal ferrite and polycrystalline ferrite.

This type of magnetic head has a tape contacting surface made of single crystal ferrite and the other main magnetic path made of polycrystalline ferrite. It has excellent characteristics such as low wear and uniform characteristics because the crystal plane can be selected, and because the other main magnetic path is made of polycrystalline ferrite, there is little sliding noise and high output can be obtained.

However, in actual manufacturing, single crystal ferrite is used.

It was difficult to manufacture with high precision due to problems such as alignment of the joint portion of the ferrite and polycrystalline ferrite. Furthermore, since such magnetic heads are composed of ferrite, they also have the disadvantage that recording and reproducing on high coercive force tapes is difficult.

In view of the above-mentioned points, the present invention makes it possible to easily and accurately manufacture a composite magnetic head using single crystal and polycrystalline ferrite, and also to manufacture a recording/reproducing head for high coercive force tape. The present invention provides a method for manufacturing a magnetic head with improved performance.

Hereinafter, the method for manufacturing the magnetic head of the present invention will be explained using examples. In this example, first, as shown in FIG. 1, a single crystal ferrite block (1) and a polycrystalline ferrite block (2) are provided, and their joining surfaces (IA) and (2A) are mirror-finished. In this case, the polycrystalline ferrite block (2) constitutes the main magnetic path, so the thickness tl is large, and the single-crystalline ferrite block (1) only forms the tape contact surface, so the thickness t2 is also small. .

At the same time, the length 12 of the monocrystalline ferrite block (1) is selected to be smaller than the length gl of the polycrystalline ferrite block (2). Next, as shown in Figure 2, both 7 elite books (
The mirror surfaces (IA) and (2 people) of 1) and (2) are placed against each other and heated in a 02-containing atmosphere at 1300°C, for example, and bonded by mutual diffusion to form a composite block (3).
form. At this time, both ends of the composite block (3) have stepped portions (4) due to the difference in length between both blocks (1) and (2).
) is formed, and the mirror surface (two) of this stepped portion (4) is used as the reference surface α fathom thereafter. Next, the composite block (3) is cut along the length as shown by the chain line (5) to provide a pair of composite block pieces (6) and (7). Then, both block pieces (6) and (
An alloy magnetic material layer having a higher saturation magnetic flux density than ferrite, such as sendust (8), is deposited on one surface of each block piece (6), for example, by sputtering, and the sendust film (8) of one block piece (6) is coated. The winding groove (
9), Form a back groove α@ for filling the fused glass and groove (9) as necessary, and a groove aυ for regulating the track width in the direction orthogonal to aOl, and form the sendust film of the other block piece (7). (8) A track width regulating groove α corresponding to the groove aυ is formed on the adhered surface. The winding groove (9) is formed using the reference plane α, and the winding groove (9) is formed so that the cap depth is only formed in the single crystal ferrite part (1). do.

Next, after sputtering s+o2g (not shown), which will become a gap spacer, on the single-crystal ferrite actuating cap forming surface of one block piece (6), as shown in FIG. Apply force to both four pieces (6) and (2) so that both sendust films (8) and (8) are in contact with each other, insert low melting point glass into the groove (9) and Ql, and heat treat it to make it mutually The glass is fused.

When these two block pieces (6) and (7) are brought together,
By aligning the reference planes α and (14) of the respective stepped portions, the mutual positions can be easily and accurately determined and combined.

Thereafter, as shown in FIG. 6, the thus obtained fused block H is cut from the center of the filled glass portion αω for track regulation to form a single head chip (10). Grind the tape contact αη, cut the rear glass filling groove a, and wind the coil in the winding hole.

In this way, as shown in FIGS. 7 and 8, both cores (1'l and fins) forming the operating cap g are of the junction type of monocrystalline ferrite (1) and polycrystalline ferrite (2), respectively. The desired composite magnetic head Qυ is obtained, in which the sendust film (8) is formed on the abutting surfaces.

According to such a manufacturing method, when the first single crystal ferrite block (1) and polycrystalline ferrite block (2) are heated and bonded to form the composite block (3), both blocks (1) and ( By providing the stepped portion (4) on the joint surface of 2) to serve as the reference plane 04), the point of the working gap depth O is determined on the reference plane I at the time of machining the winding groove (9) 1.

Moreover, when the two block pieces (6) and (7) are brought together and combined, the joining positions of the single crystal ferrite (1) and the polycrystalline ferrite (2) are easily matched by the respective reference planes Q4), Finally, the desired magnetic head QI) can be obtained with high precision.

In addition, because this magnetic head (2D) is a composite type made of single crystal and polycrystalline ferrite, there is little sliding noise and high output can be obtained. Since the membrane (8) is provided,
It becomes possible to record and reproduce even high coercive force tapes.

FIGS. 9 and 10 show other embodiments of a magnetic head obtained using the manufacturing method of the present invention. The magnetic head 04 of this example has a continuous line extending from the tape contact surface to the back gap only on the abutting surfaces of the pair of core half-holes and the core half-hole on the escape side of the magnetic tape (C) of the wire. This magnetic head consists of forming a sendust film (8) with a uniform surface and an operating gap g between the sendust film (8) and the core half-hole (L!J) on the tape entry side. Q4 is manufactured using the sendust film (8) shown in Figures 3 and 4.
In the sputtering process, sendust (8) is sputtered only on the surface of one block piece (7), and the winding groove (9) is sputtered on the surface of the other block piece (6) without coating the sendust film. ) can be easily obtained by following the same steps thereafter. In particular, according to this magnetic head (2 seconds), the eddy current loss in the sendust film (8) is reduced by 1 compared to the magnetic heads shown in Figs. 7 and 8.
In addition, the reproducing magnetic flux passes through the sendust film (8), and the influence of the large magnetic resistance at the interface between the sendust and the ferrite is reduced, thereby improving the reproducing efficiency. Also, during recording, recording is determined by the last magnetic field applied to the magnetic tape, so a Sendust film (8
), magnetic saturation does not occur in the vicinity of the operating gear flange, making it possible to perform recording similar to the magnetic head shown in FIGS. 7 and 8.

The magnetic head (c) in Figs. 11 and 12 is a modification of the one in Figs. This is the case where the film is deposited and formed. The manufacturing of this magnetic head was also the first step.
In the manufacturing process shown in Figures to Figures 6, the sendust film (
It can be manufactured easily by performing the sputtering step 8) only on the block piece having the winding groove (9) after forming the winding groove (9).

Furthermore, the present invention can also apply the above-described manufacturing method to manufacturing a bonded magnetic head simply made of single-crystal ferrite (1) and polycrystalline ferrite (2) without a sendust film, as shown in FIGS. 13 and 14. (However, the step of forming the sendust film is omitted).

As described above, the present invention simplifies the subsequent alignment process by adding a simple process of providing a stepped portion on the joining surface of a single crystal ferrite block and a polycrystalline ferrite block to serve as a reference surface, thereby achieving high precision. It is possible to manufacture a composite magnetic head.

[Brief explanation of the drawing]

1 to 6 are manufacturing process diagrams showing embodiments of the present invention,
7 and 8 are plan views and cross-sectional views taken along the line A-A of the obtained magnetic head, and FIGS. 9 and 10 show other embodiments of the magnetic head obtained by applying the present invention. FIG. 11 and FIG. 12 are a plan view and a cross-sectional view taken along the line A-A of the magnetic head according to another embodiment of the present invention. , FIG. 13, and FIG. 14 are a plan view and a sectional view along the input line of the magnetic head according to still another embodiment of the present invention. (1) is a single crystal ferrite block, (2) is a polycrystalline ferrite block, (6) and (7) are block pieces, (8)
is the sendust film, (9) is the winding groove, and α is the reference plane. 'L+Iin'A'a'jU'J8 Ji2'n (4)
Figure 7a Figure 13 Figure 9 Figure 111

Claims (1)

[Claims] A process of heating and bonding a single crystal ferrite block and a polycrystalline 7-elite block to form a composite block, a process of forming a required groove on one side of the composite block, and joining the two composite blocks via an operating cap. and a step of cutting out a single head chip after the bonding, in which a stepped portion is provided at the bonding surface of the single crystal ferrite block and the polycrystalline ferrite block, and the magnetic head is formed as a reference surface. Head manufacturing method.