JPS60125909A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the wear resistance of a magnetic head by forming a metallic film and an oxide to a track width control groove part and filling glass over those films. CONSTITUTION:The glass 6 is filled over an oxide film 5 on a nonmagnetic metallic film 4 at a track width control groove part 3 of a magnetic head 9. The recess parts 13 and 18 and grooves 12 and 19 are formed the polished mirror surfaces of rectangular parallelepiped blocks 11 and 17 made of a metallic magnetic material and constituting core half bodies 1 and 2 of the head 9. Then nonmagnetic metallic films 14 and 20 and metallic oxide films 15 and 21 are formed to parts 13 and 18. Both blocks 11 and 17 are butted to each other to form grooves 12 and 19. Then a rod-shaped glass 22 and hard solder 23 are put into the lower and upper grooves 12 and 19 respectively. Both blocks 11 and 17 are heated while they are pressed toward an arrow head. Thus the glass 22 is melted and flows into both parts 13 and 18 to fill them. At the same time, the solder 23 is also fused to adhere firmly both blocks 11 and 17.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to a magnetic head in which a magnetic metal material having a high saturation magnetic flux density, such as Sendust alloy, is used for the magnetic head core, and This invention relates to high-density recording and reproducing of a type in which the track width regulating groove is filled with glass.

[Conventional technology and problems]

Conventionally, magnetic heads used, for example, in high-density recording video tape recorders, have used single-crystal ferrite or polycrystalline ferrite as the magnetic material, and quartz glass with a high softening point, which defines the gear width, as the gap spacer. At the same time, a thin film of low softening point glass is formed in the rear gap portion, and the entire core is bonded under heat and pressure to join the core halves.

In order to narrow the track, a recess defining the l/rack 1J is provided, and the recess is filled with glass by melting.

Since such conventional magnetic heads use ferrite as a magnetic material, they cannot perform sufficient recording when, for example, a high coercive force magnetic tape is used.

Therefore, attempts have been made to fabricate a magnetic head with the same structure as the above-mentioned ferrite magnetic head using a magnetic material with a high saturation magnetic flux density, such as Sendust alloy.
When a metal magnetic material such as Sendust alloy is used as the core material, the metal magnetic material has poor affinity with the glass that fills the track regulating groove, so glass is melted and filled into the trunk width regulating groove. Even when solidified, the adhesion of this glass is weak and there is a problem of poor mechanical strength, and there is also a problem with the strength of the bond between the core halves.

[Means for solving problems]

A metal film and an oxide film are provided in the track width regulating groove of a magnetic head using a metal magnetic material, and by filling the oxide film with glass, the adhesion of the glass is improved and the magnetic head has high mechanical strength. , and also has high bonding strength between the core half-domains,
Furthermore, it provides a magnetic throat with excellent wear resistance.

〔Example〕

FIG. 1 is a perspective view of an embodiment of a magnetic head according to the present invention.

In the figure, 1 and 2 indicate core half-rest. These two core halves 1
, 2 is made of a magnetic metal material such as Sendust alloy, which is an Fe-AA alloy with a high saturation magnetic flux density.

3 is a track width regulating groove.

4 is about 01 to 0.2 μm formed on the surface of the track width regulating groove 3 by, for example, PVD means such as sputtering.
The non-magnetic metal film 5, such as AZ+Cr+Ti, Pb, etc., formed to a thickness of For example, At203°Cry, TiO2,
It is an oxide film such as PbO2.

Similarly, when At is used as the non-magnetic metal material, the oxide film is AtzO3, etc.
It is desirable to use materials of the same series (oxides of the same metal).

Reference numeral 6 denotes glass filled on the surface of the oxide film 5 on the non-magnetic metal film 4 of the track width regulating groove 3.

7 is a winding window, 8 is a gap, and 9 is the entire magnetic head.

2 to 5 are explanatory diagrams of the manufacturing process of the magnetic head according to the present invention.

First, as shown in FIG. 2, on the mirror-polished surface of a rectangular parallelepiped block 11 made of a magnetic metal material such as Sendust alloy, which constitutes one core half 1 of the magnetic head 9,
A groove 12 for forming the winding window 7 of the magnetic head 9 is formed along the longitudinal direction. Further, the rectangular parallelepiped block 11 has grooves arranged at regular intervals in a direction orthogonal to the groove 12.
A plurality of recesses 13 are formed to constitute track width regulating grooves 3 located on the core half 1 side of the magnetic head 9.

Each of the recesses 13 is formed by a cutting saw using a thin diamond blade so as to be connected to the groove 12, and the shape of each recess 13 is such that the end side of the rectangular parallelepiped block 11 is deeper and the groove 12 is deeper. It is formed in a tapered shape so that the portion connected to it becomes shallower, and its rlJ is approximately constant.

Next, as shown in FIG. 3, the non-magnetic metal film 4 on the one core half 1 side of the magnetic head 9 is formed on the surface of each recess 13 of the rectangular parallelepiped block 11 shown in FIG. For example, the film 14 of a non-magnetic metal material such as Al, Cr, Ti, Pb, etc. is formed into a non-magnetic metal film with a thickness of about 0.1 to 0.2 μm by PVD means such as sputtering in an inert gas atmosphere. The metal oxide film 5 on one core half 1 side of the magnetic head 9 is formed as follows.
For example, ktxo3. CrO2,
A film 15 of an oxide material such as TiO2, Pb0z, etc. is formed to a thickness of approximately 0.1 μm by PVD means such as sputtering in an inert gas atmosphere similar to the formation of the film 14 of the non-magnetic metal material. do.

Further, on the flat surfaces between the respective recesses 13 of the rectangular parallelepiped block 11, for example, SiO□ is applied to serve as a gap spacer.

At203. S io -Cr etc. no v-yr, no+-
A non-magnetic material having a high hardness and softening point is provided by PVD means such as sputtering similar to the formation of the film 14 of the non-magnetic metal material and the film 15 of the oxide film to form the magnetic head 9. A thin film layer 16 having a thickness equal to the width of the gap 8 is formed.

Further, as shown in FIG. 4, at the same time or before or after the above step, a rectangular parallelepiped block 1 made of a metal magnetic material such as Sendust alloy, which will constitute the other core half 2 of the magnetic head 9, is prepared.
7, a recess 18 similar to the recess 13,
groove 19, and each concave version of the previous word 2 (1 only V ma juice 1
A is applied to the film 20 of the non-magnetic metal material and the film 21 of the metal oxide material by sputtering or the like in the same manner as that applied to each concave portion 13 of the Ichiyoshi Naita Pro-Solution 11. Vi
) formed by means.

The rectangular parallelepiped blocks 11 and 17 constructed as shown in FIGS. 3 and 4 are butted and joined as shown in FIG. 5.

In connection with this joining shown in FIG.
1 and 17 are carried out so that the mirror surfaces ω of the rectangular parallelepiped blocks 11 and 17 [respective recesses 13 and 18 formed in the polished surfaces face each other and match accurately.

In addition, the rectangular parallelepiped blocks 11 and 17 that were butted together in the above
The lower rod-shaped glass 22 is inserted into the groove formed by (+n 12 , ] 9.

1 to 1, and the upper groove 19 is filled with silver solder 23 with a thickness of about 0.3 mm, for example BAg-
7 is inserted.

When the above-mentioned insertion of each part is completed, the rectangular parallelepiped block 1
1 and 17 are heated in an inert gas to a temperature near the working point of the glass rod 22 while pressurizing in the direction of the arrow.

The heating causes the rod-shaped glass 22 to melt and flow into the holes formed by the recesses 13 and 18 provided in the rectangular parallelepiped blocks 11 and 17 to fill them. Therefore, the cuboid blocks 11 and 17 are bonded together, and the silver solder 23 is also melted at the same time, so that the cuboid blocks 1
The gap between 1 and 17 is filled with the groove 19, and the rectangular parallelepiped blocks 11 and 17 are firmly bonded together.

By the way, when the rectangular parallelepiped blocks 1 and 17 are heated and pressed together, the rod-shaped glass 22 is softened and flows into the hole formed by the recesses 13 and 18. Each recess 13 and 18 rather than directly after the sendust alloy comprising 17
Since it is filled through the non-magnetic metal film and oxide film formed on the surface of the The adhesion force between the material film and glass is large because they are of the same series, and the bond is much stronger than the E1 adhesion force between sendust alloy and glass when nothing is interposed between them.

Then, the magnetic head 9 of the present invention is obtained by slicing and polishing the magnetic head composite block in which the rectangular parallelepiped blocks are joined together in this manner.

〔effect〕

As described above, in the magnetic head according to the present invention, the part that determines the gear tooth width is made of a non-magnetic material with high hardness and high softening point,
In the four parts, glass is softened and melted to join the core halves together, and in the parts that do not contribute to determining the gear width, silver solder, which is suitable for joining metals, is used to further increase the strength of the joint between the core halves. are doing.

In addition, Track 1] The regulating groove is filled with glass, which has excellent wear resistance, and the magnetic material is Sendust alloy with high saturation magnetic flux density, so it has high coercive force (if? Can be magnetized.

In addition, a metal film and an oxide film are provided in the track width regulating groove of a magnetic head using a metal magnetic material, and the oxide film is filled with glass. Instead of directly sticking to the core made of a magnetic material, it is possible to use a non-magnetic metal film formed on the surface of a metal magnetic material such as Sendust alloy and an ophthalmic material of this metal. As a result, a chain of adhesion between objects with strong compatibility is obtained, such as the adhesion force between sendust alloy and metal film, the adhesion force between metal film and metal oxide film, and the adhesion force between metal oxide film and glass. It has various excellent features such as the mechanical strength of the filled glass and the extremely strong bond between the core and the half-hole.

[Brief explanation of the drawing]

FIG. 1 is a perspective view for explaining the structure of the Katsuki head according to the present invention, and FIGS. 2 to 5 are diagrams for explaining the manufacturing process of the magnetic head according to the present invention. 1.2... Core half-open, 3... Track width regulating groove, 4... Non-magnetic metal material (metal film), 5... Oxide film,
6...Glass. Patent applicant: Katsumi Utaka, agent of Victor Japan Co., Ltd.

Claims (1)

[Claims] A magnetic head using metal magnetic 4A, characterized in that a metal film and an oxide film are provided in a track width regulating groove part, and the oxide film is filled with glass.