JPS59152519A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head with which an effective gap width and an optical gap width can be made equiv. and the accuracy of the gap width is improved by disposing a non-magnetic conductive material in a recess for regulating the track width of a magnetic head, and packing a non-magnetic packing material having affinity with the non-magnetic conductive material in the recess on the surface of the non-magnetic conductive material. CONSTITUTION:Thin films 5, 5' of non-magnetic conductive materials are formed in the recesses 4, 4' of rectangular parallelopiped blocks 1, 1' formed of a high permeability magnetic material such as Mn-Zn ferrite or the like. A thin film layer 6 of a non- magnetic material having high hardness is formed on the flat surface between the recesses 4 on the top surface of the block 1 at the thickness (g) equiv. to the gap width of a magnetic head. A thin glass film layer 7 having a low softening point is formed at the thickness (g) or below on the flat surface, polished to a specular surface, in the part of the block 1 except the part where the layer 6 is formed. These rectangular parallelopiped blocks are butted in such a way that the recesses 4 and 4' formed thereto coincide exactly with each other and bar-like glass 8 having a relatively low softening point is disposed in the groove formed of the grooves 2 and 2' provided to the butted blocks 1 and 1'. When the blocks 1, 1' are heated under pressure from both sides, the glass 8 softens so as to be filled in the groove constituted of the grooves 2 and 2'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and provides a material having an affinity for the filler between a non-magnetic filler filled in a track width regulating recess of the magnetic head and a magnetic material of the core. By interposing the conductive film, deterioration of the magnetic properties of the magnetic head core can be prevented, and furthermore, by forming the gap spacer material from a non-magnetic material that is unlikely to cause interdiffusion with the filling material,
It is an object of the present invention to provide a magnetic head in which the effective gap width and the optical gap width can be made substantially equivalent, and the gap width precision can be improved.

Conventionally, magnetic heads for high-density recording video tape recorders use single-crystal ferrite or polycrystalline ferrite as the core magnetic material, use quartz glass with a high softening point as the gap spacer material that defines the gap width, and use a semi-dead core. To join them together, a low-melting point glass thin film was formed in the rear gap, and the half-core cores were joined together by heating and pressure bonding.Furthermore, a concave part for regulating track width was formed to make the trunk narrower. It is constructed by melting and filling glass into the recess for regulating the width of the recess.

For this reason, the track width regulating recess is filled with glass, and a low melting point glass thin film formed in the rear gap is heat-pressed to join the core halves. A mutual diffusion phenomenon occurs between the glass and the core magnetic material, and also between the glass and the quartz glass used as the gap spacer material, and the diffusion of the glass into the ferrite part used as the core magnetic material causes the ferrite to The magnetic properties may deteriorate, the track width may become smaller than desired, and the gap spacer material may change to a mixed glass with a low melting point different from the original silica glass, causing the core halves to be crimped together. The gap width varies slightly depending on the magnetic field, making the gap width dimension inaccurate, making it difficult to improve the accuracy of the gap width, and deteriorating the characteristics of the magnetic head. Furthermore, it is difficult to produce a gap with a uniform gap width, resulting in poor manufacturing yield, and the gap spacer material is made of a mixed glass of ferrite or other core material, quartz glass, and the glass of the trunk width regulating recess. A mutual diffusion phenomenon occurs, deteriorating the magnetic properties of the ferrite near the gap, and the performance of the magnetic head deteriorates by two levels.

The present invention eliminates the above-mentioned drawbacks, and examples thereof will be described below.

1 to 6 are explanatory diagrams of the manufacturing process of the magnetic head according to the present invention.

First, as shown in FIG.
After mirror-polishing the upper surface of this rectangular parallelepiped block 1, grooves 2, which are notches, are formed by grinding along the longitudinal direction at the corners of this mirror-polished surface and the surface that will become the tape running surface.
A groove 3, which will become a winding window, is formed by grinding approximately parallel to the groove 2 of the groove. Furthermore, a plurality of recesses 4 are formed at regular intervals in a direction perpendicular to these grooves 2 and 3 so as to be connected to the grooves 2 and 3 using a dicing saw or the like using a diamond blade. The shape of this recess 4 is such that its depth is equal to the groove 2.
It is tapered so that the side is deeper than the groove 3 side, and its width is approximately constant.

Further, as shown in FIG. 2, a rectangular parallelepiped block 1' having the same shape as the rectangular parallelepiped block 1 is formed by cutting and grinding a high permeability magnetic material such as Mn-Zn ferrite, and the upper surface of 1' is attached to this rectangular parallelepiped block. After mirror polishing, rectangular parallelepiped block 1
A groove 2' similar to the groove 2 of is formed, and a recess 4' similar to the recess 4 of the rectangular parallelepiped block 1 is further formed.

Then, as shown in FIGS. 1 and 2, in the recesses 4, 4' of the rectangular block 1.1', for example, A g N O
1 Thin film 5 of non-magnetic conductive material such as At, Or, Sn, etc.
5' is formed by means such as sputtering.

Thereafter, as shown in FIG. 3, for example, a cermet such as 5iO-Or, a chromium metal, a carbide compound such as SIC, or a mixed oxide magnenoide is applied to the flat surface between the recesses 4 on the upper surface of the rectangular block 1. , sputtering, etc. of a non-magnetic material with a relatively high melting point and high hardness other than glass such as aluminum, titania, etc., especially a hard non-magnetic material that is difficult to cause interdiffusion with the glass to be filled in the recesses 4 and 4'. A thin film layer 6 having a thickness g corresponding to the gap width of the magnetic head is formed by the following means. Incidentally, when a thin film layer similar to the thin film layer 6 is formed on the rectangular parallelepiped block 1', the sum of the thicknesses of these thin film layers may be made equal to the gap width.

Further, a glass thin film layer 7 having a thickness of g or less and having an A temperature is formed on the flat, mirror-polished surface of the rectangular parallelepiped block 1 other than the portion where the thin film layer 6 is formed, by means such as sputtering. Note that this glass thin film layer 7 has a rectangular parallelepiped shape. It is also possible to form them in the rectangular parallelepiped block 1'.

Then, each rectangular parallelepiped block constructed as described above, for example, the rectangular parallelepiped block shown in FIG. 2 and the rectangular parallelepiped block shown in FIG. As shown in FIG. 4, the grooves formed by the grooves 2 and 2' of the butted rectangular parallelepiped blocks 1 and 1' are heated at a temperature of about 100° C., for example, lower than the softening point of the low softening point glass of the glass thin film layer 7. A rod-shaped glass 8 having a relatively low softening point is arranged and heated in an inert gas to a temperature near the working point of the rectangular parallelepiped blocks 1, 1' while applying pressure in the direction of the arrow from both sides. .

Then, the rod-shaped glass 8 not only softens and fills the groove formed by the grooves 2 and 2', but also fills the grooves 4 and 4'.
The cavity formed by
, 4', the rectangular parallelepiped blocks 1 and 1' are formed by softening and filling the rod-shaped glass 8 through the thin films 5, 5' formed on the cuboid blocks 1 and 1'.
The rectangular parallelepiped blocks 1 and 1' are also bonded together by the softened glass thin film layer 7. Incidentally, since the material of the rod-shaped glass 8 and the material of the thin film 5.5' are made of oleophilic materials, the adhesive strength between the rectangular parallelepiped blocks 1 and 1' is sufficiently strong.

During the adhesion process between the rectangular parallelepiped blocks 1 and 1', the softened glass of the rod-shaped glass 8 enters the gap and cracks, but the thin film layer 6 is not attacked by this softened glass with a relatively low softening point. Since there is no interdiffusion phenomenon between the softened glass and the thin film layer 6, if the thickness of the thin film layer 6 changes and the gap width deviates from the designed value, the gear knob width will be covered by high-precision lath diffusion. The magnetic material near the gap is not attacked, and there is no deterioration in magnetic properties.

Furthermore, even if the softened glass of the rod-shaped glass 8 fills the gap formed by the recesses 4 and 4', a thin film 5.5' made of a non-magnetic conductive material is formed on the surface of the recess. Therefore, the softened glass of the rod-shaped glass 8 does not diffuse into the Mn-Zn ferrite that is the material of the rectangular parallelepiped blocks 1, 1', and the magnetic properties of the magnetic material are not deteriorated, and the track width can be increased. There is no such thing as making it smaller than the design value.

Next, the composite block 9 of the rectangular parallelepiped blocks 1 and 1' glass-bonded by softening the glass rod 8 and the glass thin film layer 7 is cut along one imaginary plane shown by the dashed line and the dashed double dotted line in FIG. Thereafter, a predetermined cutting and polishing process is performed to construct the magnetic head 10 as shown in FIG.

In Fig. 6, 11.11' is a half core of the rectangular parallelepiped block 1, 1' made of magnetic material such as Mn-Zn7 elite, 12.12' is a thin film of non-magnetic conductive material such as hg, Reference numeral 13 and 13' denote glass made of rod-shaped glass 8 filled in the concave portion on the thin film, 14 a gap spacer material such as cermet such as 5iO-0, and 15 a wire-wound window.

In the magnetic head configured as described above, a non-magnetic material with a relatively high softening point and a non-glass material is disposed in a portion that determines the gap width, and a non-magnetic material that does not contribute to determining the gap width is disposed in a portion that determines the gap width. Since we used a glass material with a low softening point in the parts other than the gap-sweezer clamping surfaces to join the magnetic helide core half-holes, the gap width is always 9 when bonding the core half-holes together, and this gear knob There is no variation in the width, and the gap width dimension can be configured with extremely high precision.Also, there is no mutual diffusion phenomenon at the sandwiching surface between the gap spacer and the half-core core during heat bonding, and the magnetic material near the bonding surface of the gap spacer is There is no deterioration in magnetic properties, the high frequency properties of the magnetic head are excellent, and there is no discrepancy between the optical gap width and the effective gap width, and gap dimensions can be easily measured. Furthermore, since mixing and mutual diffusion does not occur between the gap spacer and the glass filled in the recesses formed on both sides of the gap spacer holding part of the core half-closed, the composition of the gap spacer does not change. An extremely precise gap is constructed.

The glass that is filled in the recesses formed on both sides of the gap spacer holding part of the core half-hole is filled on a non-magnetic conductive film, so no mutual diffusion between the magnetic material and the glass occurs. , there is no deterioration in the magnetic properties of the magnetic material, and since the surface of the recess around the gap is covered with a non-magnetic conductive film, the leakage magnetic field from the track width forming part of the magnetic path surface of the magnetic helad core is reduced. The strength of the magnetic field at the gap portion of the tape sliding contact surface of the magnetic head is also strong, and the recording and reproducing characteristics are excellent.

As described above, in the magnetic head according to the present invention, a non-magnetic conductive material is disposed in the track width regulating recess of the magnetic head, and a non-magnetic conductive material having affinity with the non-magnetic conductive material is placed in the recess on the surface of the non-magnetic conductive material. Since it is filled with a non-magnetic filler, the bond between the core halves of the magnetic head is strong, and there is no mutual wave or scattering phenomenon between the filler and the magnetic head core magnetic material, which improves the magnetic properties of the magnetic head. There is no deterioration, and since the track width regulating recess around the gear knob is covered with a conductive material, there is little leakage magnetic field, the magnetic field strength at the gap is strong, and the recording and reproducing characteristics VC
Furthermore, by composing the gap spacer material of the magnetic head with a non-magnetic material that is unlikely to cause interdiffusion with the above-mentioned filler, the gap width dimension accuracy is extremely high, the manufacturing yield is improved, and further, It has features such as no deterioration in the magnetic properties of the ferromagnetic material core and, for example, excellent high frequency properties.

[Brief explanation of the drawing]

1 to 6 are explanatory diagrams of the manufacturing process of the magnetic head according to the present invention. 11.11'... Core half, 1'2, 12'...
Thin film of conductive material, 13.13'...glass (filler),
14...Gap spacer material. Patent applicant: Victor Japan Co., Ltd. Age 1 Figure 30 Age 50 Bu 2 Show'74 Show? 6 Figure

Claims (1)

[Claims] ■ A non-magnetic conductive material is provided in the trunk width regulating recess of the magnetic head, and a non-magnetic filler having affinity with the non-magnetic conductive material is placed in the recess on the surface of the non-magnetic conductive material. A magnetic head characterized by being filled with. ■ A non-magnetic conductive material is placed in the track width regulating recess of the magnetic head, and the four parts on the surface of the non-magnetic conductive material are filled with a non-magnetic filler that has an affinity for the non-magnetic conductive material. 1. A magnetic head characterized in that the Gyaso spacer material of the head is composed of a non-magnetic phase that is less likely to cause interdiffusion with the filler.