JPS6257112A - Production of magnetic head chip - Google Patents

Abstract

PURPOSE:To produce a magnetic head chip having high performance at a low cost by cutting out the individual head chips in the state in which auxiliary cores are united to an alloy magnetic material from a plate-shaped composite magnetic material block formed by uniting three materials; an oxide magnetic material, nonmagnetic material and alloy magnetic material to one body. CONSTITUTION:Grooves 2 sized 0.2-0.5mm width and 0.3-0.5mm depth are formed to a single crystal ferrite substrate 1 and PbO glass 3 is poured into the grooves 2, then the front and rear faces are ground to obtain a composite substrate 6. A thin film 7 consisting of 'Sendust(R)' or the like is then formed to 10-60mum thickness on a smooth surface 4 and the substrate is cut along the boundaries between the single crystal ferrite 1a and the glass 3 at every other boundaries to form composite material units 8. These units are laminated to obtain a block 9. Piece units 10 are cut out of the block at a prescribed azimuth angle and the cut units are cut at the part to form a gap butt face 11 to obtain a pair of pieces 12, 12. A groove 13 for winding and a groove 14 for joining are formed to the butt faces 11 along the longitudinal direction. After the butt faces 11, 11 are polished, SiO2 or the like is stuck to the faces 11 and the faces are joined by using glass having the softening point lower than the softening point of the glass 3 in the grooves 13, 14.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a magnetic head suitable for recording and reproducing signals including high frequency components such as video signals on a recording medium such as a metal tape having a high coercive force. This invention relates to a method for manufacturing a chip.

<Prior art> The core of magnetic heads used in white radio table recorders and the like usually uses an oxide magnetic material such as single-crystal ferrite, which has excellent wear resistance and magnetic permeability in high frequency bands. . Incidentally, in recent years, recording densities have been increasing as equipment has become more compact, and for such high-density recording, for example, metal tapes, which have a higher coercive force than iron oxide tapes, are preferred. is suitable. However, when using a magnetic head using single-crystal ferrite with this metal tape, single-crystal ferrite has a characteristic of low saturation magnetic flux density.

Therefore, a problem arises in that the metal tape cannot be sufficiently magnetized.

Therefore, alloy magnetic materials such as Sendust amorphous metal, which has a high saturation magnetic flux density, have attracted attention as materials for magnetic heads. However, this kind of alloy magnetic material is
There are problems such as a decrease in magnetic permeability in a high frequency band due to its low specific resistance value and low wear resistance. For this reason, in a magnetic helad core made of an alloy magnetic material, reinforcing cores made of a non-magnetic material such as glass and an oxide magnetic material such as ferrite are bonded to both sides, thereby achieving the above two characteristics of the alloy magnetic material. Efforts are being made to avoid the problem.

<Problems to be solved by the invention> The structure in which reinforcing cores are adhered to both sides of a magnetic helad core made of an alloy magnetic material is not suitable for mass production, and other problems arise such as low productivity and increased costs. .

The present invention was made with the aim of solving this problem and mass producing a magnetic head that combines the high magnetic permeability characteristics of an alloy magnetic material.

Means for Solving the Problems> In order to achieve the above object, the method for manufacturing a magnetic head chip of the present invention includes the following steps. That is, on one side of a composite substrate having a structure in which an oxide magnetic material having high magnetic permeability in a high frequency band and a non-magnetic material having wear resistance are alternately laminated in a direction perpendicular to the thickness direction, After forming a thin film of alloyed magnetic material with high saturation magnetic flux density,
The composite substrate is cut every other time along the boundary between the oxide magnetic material and the non-magnetic material to obtain elongated composite material units, and the composite material units are stacked in the thickness direction of the composite substrate to form a plate shape. A pair of elongated composite magnetic material pieces are cut out at a predetermined azimuth angle from the composite magnetic material block of
A winding groove and a bonding groove are formed along the longitudinal direction on the surface where the oxide magnetic material, the non-magnetic material, and the alloy magnetic material of at least one of the composite magnetic material pieces are exposed; After applying mirror polishing to the corresponding surface of the other composite magnetic material piece, the pair of composite magnetic material pieces are joined to each other by butting the surfaces with each other through a thin film of non-magnetic material serving as a gap material, The composite magnetic material piece is cut at the oxide magnetic material and nonmagnetic material portions to obtain individual magnetic head chips.

According to the present invention, since an oxide magnetic material, a non-magnetic material, and an alloy magnetic material are obtained and individual magnetic head chips are cut out from them, work such as gluing a reinforcing core to the alloy magnetic material is not necessary. This is not necessary and mass production can be easily achieved.

<Example> The illustrated embodiment will be specifically described below.

FIG. 1 is a perspective view of the obtained magnetic head chip, and FIGS. 2(a) to 2(j) are perspective views of members during the process.

First, grooves 2 with a width of 0.2 are formed on the surface of a single crystal ferrite substrate 1.
Form parallel to each other with a size of ~0.5 [degree] and a depth of 0.3 to 0.5 [fin] (see Figure 2 (a) and Figure 2 (b)).
0 Next, in this lecture 2, p with a softening point of 650 to 750[''C]
BO-based glass 3 is melted by heat treatment and poured, and after hardening, surface polishing and mirror polishing are performed to form a smooth surface 4 (see Figure 2 (c)). Grind the crystal ferrite part and make single crystal ferrite l
A composite substrate 6 is obtained in which a and glass 3 are alternately laminated in a direction perpendicular to the thickness direction. (See Figure 2(d)).

Next, on the smooth surface 4 of this composite substrate 6, 10 to 60 μl of a thin film 7 of an alloy magnetic material having a high saturation magnetic flux density, such as sendust, is applied by sputtering or vapor deposition.
Il] and cut every other unit along the boundary between the single crystal ferrite 1a and the glass 3 to form an elongated composite material unit 8 having a rectangular cross section. (See FIG. 2(f), the broken line in FIG. 2(e) indicates the position of the cut surface), then this composite gold material unit 8 is attached to the composite substrate 6.
Composite magnetic material Pro 7 Ri9 is laminated in the thickness direction.
(See Figure 2 (g)).

Next, a piece unit 10 is cut out from the composite magnetic material block 9 at a predetermined azimuth angle, and then cut at a portion that will become the gap abutting surface 11 to obtain a pair of composite magnetic material pieces 12, 12 (Fig. 2 (h) ) and Figure 2(i)
(Refer to FIG. 2(h), the broken line indicates the cut surface.) On the abutting surfaces 11.11 of the thus obtained composite magnetic material pieces 12, 12, the single crystal ferrite 1a, the glass 3, and the alloy magnetic material thin film 7 are formed. is exposed along the longitudinal direction on at least one abutting surface 11. l11
3 and form 71114 for joining (see Fig. 2 (i))
0 Next, each abutting surface 11°11 was polished,
Surface roughness Rmax≦100 [After mirror finishing,
S of non-magnetic material that will become the gear member material is placed on these surface 11.
i O2, glass (not shown), etc. are deposited using a method such as sputtering to a thickness of 0.15 to 0.20 [μ ring], and the individual materials on surfaces n and ii are aligned and butted together. Apply pressure as appropriate. Then, the winding groove 13 and the bonding groove 14 are filled with glass having a softening point lower than that of the glass 3, for example, Pb having a softening point of 550 to 650 ['C].

A glass rod (not shown) is inserted and heat welding is performed in hydrogen or inert gas to form a composite magnetic material piece 12.
12 to each other to obtain a magnetic head block 15 (
(See Figure 2 (j)).

The surface of the magnetic head block 15 on the glass 3 side becomes the tape sliding surface 17, and this surface has a radius of curvature of 5 to 8.
After processing into a curved surface shape of R, the magnetic head chip 16 shown in FIG. 1 is obtained by cutting at the glass 3 portion. Thereafter, a magnetic head is obtained by winding (not shown) using the winding groove 13m and fixing it to the head base.

The thus obtained magnetic head chip 16 has single crystal ferrite 1a integrally provided on both sides of a thin alloy magnetic material 87, and glass 3 is integrally provided on both sides of the tape sliding surface 17. There is. Therefore, during recording, the high saturation magnetic flux density characteristics of the alloy magnetic material are effectively exhibited.
Furthermore, during playback, the high magnetic permeability properties of the single crystal ferrite that is the auxiliary core are effectively exhibited, so it is possible to obtain a magnetic head that is excellent in both recording and playback performance and has wear resistance. I can do it. Furthermore, since the gap abutting surfaces are integrated by heat welding of PbO glass, the mechanical strength is high, and from this point as well, high reliability can be obtained.

<Effects of the Invention> As is clear from the description of the above embodiments, according to the method for manufacturing a magnetic head chip of the present invention, an oxide magnetic material,
Individual magnetic head chips are cut out from a plate-shaped composite magnetic material block in which a non-magnetic material and an alloy magnetic material are integrated, with an auxiliary core integrated into the alloy magnetic material. Therefore, there is no need for the process of bonding the auxiliary core to the alloy magnetic material, making it suitable for mass production. A high-performance magnetic head with these characteristics can be produced at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head chip obtained according to an embodiment of the present invention, and FIG.
)(g)(h)(i)(j) are process explanatory diagrams of one embodiment of the present invention. 1... Single crystal ferrite substrate 1a... Single crystal ferrite 3... Glass, 6... Composite substrate 7... Alloy magnetic material thin film 8... Composite material unit 9... Composite magnetic material block 11... Butt surface 12... Composite magnetic material piece 13... Winding groove, 14... Joining groove 16...
Magnetic head chip 17... Tape sliding contact surface

Claims (1)

[Claims] (1) On one side of a composite substrate with a structure in which an oxide magnetic material with high magnetic permeability in a high frequency band and a non-magnetic material with wear resistance are alternately laminated in a direction perpendicular to the thickness direction. , after forming a thin film of alloy magnetic material with high saturation magnetic flux density, cut every other composite substrate along the boundary between oxide magnetic material and non-magnetic material to obtain elongated composite material units; After forming a plate-shaped composite magnetic material block by laminating material units in the thickness direction of the composite substrate, a pair of elongated composite magnetic material pieces are cut out from this composite magnetic material block at a predetermined azimuth angle, and at least one of the Winding grooves and bonding grooves are formed along the longitudinal direction on the surface where the oxide magnetic material, non-magnetic material, and alloy magnetic material of the composite magnetic material piece are exposed, and this surface and the other corresponding surface are formed. After performing mirror polishing on the surfaces of the composite magnetic material pieces, the surfaces are butted against each other through a thin film of non-magnetic material serving as a gap material, and the pair of composite magnetic material pieces are combined with each other to form a composite magnetic material. A method for manufacturing a magnetic head chip, comprising cutting pieces of oxide magnetic material and non-magnetic material to obtain individual magnetic head chips.