JPS5848221A - Manufacture of composite type magnetic head - Google Patents

Abstract

PURPOSE:To obtain a composite magnetic head which is suitable for tapes which are highly resistive to the magnetic force, by forming the head core by using a specified technology in such a way that a magnetic ferrite is used for the working gap forming surface and a metallic magnetic material having a large saturated magnetic flux density (Bs) for the other main magnetic pathes. CONSTITUTION:A composite substrate 6 is manufactured by piling up a ferrite plate on the whole surface of a non-magnetic card 1 made of glass, ceramic, etc., and by forming plural parallel ferrite pieces 3 by etching, and then, by filling grooves between the ferrite pieces with a metallic magnetic material layer 5 of sendust, etc., having a Bs which is higher than that of the ferrite. A plural number of the substrate 6 is piled up in layer and a layered body 8 is formed, and the layered body 8 is cut along dotted lines 7 into blocks 9, and then, each block 9 is further cut along dotted lines 10 into core blocks 11 and 12. Then, each head tip 17 is formed in such a way that a groove for winding 14 is installed into each block 11 and gap (g) forming surfaces 14 and 15 are mirror finished, and then, two block cores are united with each other with a spacer between them. Finally, each magnetic head is obtained when the tape contacting surface is polished and a winding is installed. In this way, a composite head having excellent characteristics in both high density recording and reproducing is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a general magnetic spatula rog method using a head core made of magnetic ferrite and a metal magnetic material with a high saturation magnetic flux density B8.

In recent years, high coercive force tapes have been developed as a result of increasing density.Although ferrite magnetic spatula has excellent high frequency characteristics, these high coercive force tapes have a high coercive force due to the magnetic material. The drawback is that the features of magnetic tape cannot be fully utilized. On the other hand, metal magnetic materials such as 1 Sendust have a large saturation magnetic flux density B8, so they can provide higher output than ferrite during recording, but they have the disadvantage of high loss at high frequencies and deterioration of reproduction characteristics.

In view of the above-mentioned points, the present invention provides a manufacturing method for a nine-sodium compound magnetic head by making magnetic saturation less likely to occur during recording and recording sufficiently on a high-frequency magnetic tape, and by improving reproduction characteristics at high frequencies. This is what we provide.

Hereinafter, a method for manufacturing a composite magnetic head according to the present invention will be explained using examples.

FIG. 1 shows an embodiment of the present invention in which the temperature is 0.1.
Prepare a non-magnetic guard substrate (1) made of glass ceramic or the like as shown above, and insert this guard substrate (1).
) A magnetic ferrite plate (
For example, Mn-Zn 7 Z-lite, Nl-Zn ferrite (2) are bonded together. This glass fusion is performed on the surface of the guard substrate (1), for example, with B, Os -810m
-*z2o3 type O glass is deposited by sputtering, and a magnetic ferrite plate (2) is placed on it and pressure bonded by heat treatment at 550°C. .

Next, as shown in FIG. 1B, a part of the magnetic ferrite plate (2) is removed into strips at predetermined intervals using a grindstone or selective etching.
Magnetic ferrite pieces of 9 carbon atoms arranged parallel to each other (3)
K separate. Therefore, as shown in FIG. 1C, in the $pI (4) between each magnetic ferrite piece (3), a metal magnetic material having a saturation magnetic flux density higher than that of the magnetic ferrite piece (3), such as sendust, is added. (5) is filled by sputtering to form a composite substrate (6).

Then, this sendust (5) and the ferrite piece (3
) is ground to a predetermined thickness d. This thickness d corresponds to the track width.

Next, as shown in the first diagram, a plurality of composite substrates (6) thus obtained are laminated and combined. For this joining, the above-mentioned glass or a glass having a softening point slightly lower than this is deposited on each joining surface of the composite substrate (6) by sputtering, laminated, and then joined by heat treatment at 500C. This bonding provides Sendust (5) with sufficient magnetic properties.

Next, the obtained laminate (8) with 1 is attached to the dotted line (7) in FIG.
), cut out a block (9) containing a pair of magnetic ferrite pieces (3) and sendust (5) in a mesh pattern, that is, according to the lamination direction, and then
The block core pair (11) and 0 are obtained by dividing the block core pair (11) and 0 (shown with diagonal lines) into two along point M in FIG. 1E (FIG. 1F).

Next, as shown in Figure F of Building 1, one block core (11
) After forming the winding groove 0 on both cores αυ and α
Apply lock surface processing to the ear tooth forming surface a4 (c) of No. 2.

Next, as shown in Figure 1G, one block core aυ is coated with, for example, an 8iOfi film (not shown), which will serve as a gear oxide film (-), and both block cores (El) and (13) are bonded together. This so-called gap bonding is performed using a glass with a lower softening point, such as Pb0-BIOI, than the glass for fusion used in the process of Figure 1 and Figure 1.
- ZnO-based glass is attached and bonded to the gap forming surface of the block core aD by sputtering.

After that, the guard material part (1) is attached to the head block.
Cut it first! I! ! Head chip a as shown by IHK
Get η. Thereafter, the tape-contacting surface of the head chip is polished and a coil is wound in the winding hole (1).

According to this manufacturing method, the sliding surface of the actuation ear g is formed of a metallic magnetic material with a large saturation magnetic flux density ynB, such as Sendust (5), and the other main magnetic path is formed with a large specific resistance p. A magnetic spatula P made of magnetic ferrite (especially polycrystalline ferrite) (3) and further provided with a non-magnetic guard material (1) is obtained.

In this composite magnetic head, the vicinity of the working gap g is made of a metallic magnetic material, so magnetic saturation does not occur during recording, and the main magnetic path is made of polycrystalline ferrite, so there is no deterioration in the reproduction characteristics at high frequencies. It is suitable for application to a brass re-use head for tape. Incidentally, when comparing the spacing P characteristics, the magnetic head according to the present invention is superior to the conventional head in high frequency characteristics as shown below.

And, since non-magnetic gar P material made of glass conductors is placed on both sides of -;A, the mechanical strength is high despite the small track width.It can be used stably. Also, during manufacturing, the guard board (1) and magnetic ferrite board (2) shown in Figure 1 are used.
), the lamination of the composite substrate (6) in Figure 1, and the gap bonding in Figure 1G are all bonded by glass fusion, which is less reliable than bonding using conventional organic adhesives. A high magnetic head is obtained.Furthermore, a magnetic ferrite plate (2) is bonded onto the guard substrate (1) and separated into a plurality of magnetic ferrite pieces (3) by etching and grinding. By filling sendust (5) between each elemental piece (3) and grinding it to a predetermined thickness d, it is possible to make the thickness of the sendust part and the ferrite part of the composite head puller the same. At the same time, the track width d4 can be obtained with high accuracy.

In addition, in the process of FIG. 1P in which a pair of block cores aD and a are provided in FIG. , (2) As shown in Figure 2, the notch for glass fusing is provided with a section, and this notch (Is
A bar-shaped glass aI (the same glass used in the process shown in Fig. 1 G) is inserted into the hole, and both block cores υ and 03 are glass-fused, and then cut at the guard material part (1). It is also possible to obtain Hera P Chitsuzo a-to as shown in the figure.

In addition to peeling off the gap bonding shown in FIG. 1, it is also possible to apply a liquid containing sodium silicate as a main component to the gap forming surface and bond at 200C or less.

In addition, in the field of magnetic heads, there is known an azimuth head in which the main surface of a spatula P chip with an operating gap tilted rather than perpendicular to the main surface of the chip is directly attached to a single head substrate to perform so-called azimuth recording. ing. Even in the embodiment shown in FIG. 1IN1, the azimuth head can be easily formed by changing the way the block cores are cut out. During the process shown in Figure 1E, the block cores aO and (13) are cut out diagonally by an angle α as shown by the dotted line υ in Figure 4 to form block pair a1.
) and aa are obtained, and after joining this block pair riD and aa via an ear tube spacer (Fig. 5), the chip is cut. As shown in Fig. 6, the operating gap g is made relative to the main surface of the chip. Thus, an azimuth head tip tilted by a right angle angle α is obtained.

FIG. 7 shows another embodiment of the invention. In this example,
As shown in Figure 7, a plurality of soft magnetic plates, such as Mn-Zn ferrite plates, and non-magnetic plates (for example, crystallized glass plates) that serve as guard materials are alternately laminated and combined by glass bonding. do. This laminate (to) is sliced parallel to the plane facing the stacking direction Ka as shown by point m (goods) to form a so-called gar P.
Obtain the substrate.

Next, as shown in FIG. 7B, a magnetic '7 elite plate (1) is placed on one sliced surface of the Gar P substrate (1), which is made up of alternating non-magnetic materials (sza) and magnetic ferrite (slm).
For example, Mn-Zn ferrite or N1-Zn7 ferrite II) CIID is combined by glass bonding.

Next, as shown in Figure 7C, use a grindstone and an etched fern.
The magnetic ferrite portion (2) is selectively removed in strips at predetermined intervals to form a number of parallel magnetic ferrite pieces■
Separate into The structure of the firefly is the same as the one shown in Figure 1 C and below. That is, as shown in Figure 7, the magnetic ferrite pieces (b) also have a high saturation magnetic flux density variation in the grooves (to) between the magnetic ferrite pieces (9), for example, F.
A metal magnetic material such as an AA-81 alloy or an F.-Co-81-B amorphous alloy, in this example sendust, is filled by sloping to form a composite substrate.

After laminating a plurality of these composite substrates and joining them together using glass adhesive, cut them out at the position of point *@a shown in Fig. 7E to obtain the block cores 2 and 4. As shown in Fig. 7F, after forming a winding groove in one block core, the gap forming surfaces of both blocks;
For example, by coating both block cores and (
to) with glass adhesive (#7 Figure G), then 1
．． This head block (C) is cut at the guard material portion (to) to obtain a head tip (FIG. 7H).

According to the manufacturing method of this embodiment, the tape sliding surface of the working gap g is made of sendust, the main magnetic path is made of magnetic ferrite, and both sides of the herad core are formed on the tape sliding surface. A composite magnetic head is obtained in which the non-magnetic guard material (2) is arranged. As mentioned above, according to the present invention, a composite magnetic head that is less likely to cause magnetic saturation of the head core and has improved playback characteristics can be manufactured easily and with high reliability. Recording and replay! It is suitable for application to the spatula P.

[Brief explanation of the drawing]

Figures 1C and below are process charts showing one embodiment of the present invention, Figures 2 and 3 are process diagrams showing other embodiments of the present invention, and Figures 4 to 6 are process diagrams showing other embodiments of the present invention. A process diagram showing an example of w
, 7A and 7H are process diagrams showing further embodiments of the present invention. (1) is a non-magnetic Gar P substrate, (2) is a magnetic ferrite plate, (3) is a magnetic ferrite piece, (4) is a metal magnetic material, aυaa is a block core pair, and aη is a spatula P chip. Figure 1

Claims (1)

[Claims] A step of bonding and combining the guard substrate and the magnetic 7-elite plate;
A step of separating the magnetic ferrite plate into magnetic ferrite pieces arranged parallel to each other, and filling a metal magnetic material having a saturation magnetic flux density 4 higher than the magnetic ferrite between the magnetic ferrite pieces to obtain a composite substrate. The process includes a step of combining multiple layers of the composite substrate, a step of cutting out a block containing a pair of magnetic ferrite pieces and a metal magnetic material according to the lamination direction, and a step of dividing the block into block core pairs. A complex process comprising the steps of: forming a groove in the block; a step of joining the block core pair via a gap spacer; and a step of cutting at the guard material portion to obtain a tsudochitsuzo. Manufacturing method for type magnetic heads.