JPS6357849B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-performance magnetic head with a novel configuration using an amorphous metal magnetic material that has excellent high frequency characteristics, low noise, and has a long life, and a method for manufacturing the same. .

The characteristics of magnetic heads for high-density magnetic recording include high sensitivity, low noise over a wide frequency band, and
In addition, it is required to have wear resistance and long life.

Conventionally, Mn-Zn ferrite, sendust alloy, permalloy alloy, etc. are known as ferromagnetic materials constituting the magnetic head core, but these materials are not necessarily satisfactory.
For example, ferrite material has excellent high frequency characteristics,
It also has excellent wear resistance, but due to its low saturation magnetic flux density, magnetic tape with high coercive force for high-density recording cannot be used for sufficient recording. There are problems such as low recording resolution and a lot of sliding noise, which is thought to be caused by magnetostriction.

In addition, although alloy materials such as sendust have low noise and high saturation magnetic flux density, they are susceptible to processing distortion due to machining such as punching, and the material itself has low hardness and wear resistance, and has electrical specific resistance. Since this is small, there is a major problem in the deterioration of high frequency characteristics due to eddy current loss.

Amorphous metals have recently been discovered and are attracting attention as a new material that overcomes the disadvantages of ferrite magnetic materials and alloy magnetic materials and satisfies all the requirements for magnetic heads for high-density magnetic recording.

In general, metals form crystals in which the constituent atoms are regularly arranged in a three-dimensional manner in the normal solid state, but under special conditions the atoms become disorderly arranged, similar to the liquid state. In contrast to crystalline metals, these metals are called amorphous metals.

This amorphous metal generally has high hardness, high tensile strength,
They are corrosion resistant and some have excellent soft magnetic properties. Also, this amorphous metal usually has a temperature of 10 ⁵ °C/sec.
It is obtained by rapid cooling at the above cooling rate, and in order to achieve this condition, it is necessary to thin the molten metal, expand its surface area, and instantaneously cool it.

Usually, in practical use, amorphous metals are obtained as long thin plate samples with a thickness of about 10 μm, and constructing a magnetic head using such amorphous metals is difficult.
This is not possible with previously known methods and requires special construction means.

This amorphous metal is hard and difficult to process, and heating above the crystallization temperature of this material irreversibly deteriorates its magnetic properties, so processing conditions are also very limited. For this reason, it has been difficult to form the structures necessary to construct the magnetic head, such as forming an appropriate magnetic core shape and, in particular, forming a minute working gap.

The present invention has excellent characteristics for high-density recording made of this amorphous metal magnetic material,
It is an object of the present invention to provide a multi-track or single-track magnetic head that can be manufactured easily and in large quantities.

The present invention will be explained below with reference to the embodiments shown in the figures. Normally, as mentioned above, amorphous metal magnetic materials (amorphous magnetic materials) are basically produced in the form of a thin plate ( Thickness 20~50μ
m) and can be bent into a ring shape within elastic limits. In addition, the reverse magnetostriction effect is small,
Magnetic properties do not deteriorate even when large elastic strain is applied.

The present invention relates to a magnetic head that utilizes elasticity made of such an amorphous metal magnetic material and a method for manufacturing the same, and will be explained based on the embodiments shown in FIGS. 1 to 8. FIG. It is a thin plate made of a single sheet or a laminated amorphous metal magnetic material and formed into a comb-tooth shape (hereinafter referred to as an amorphous thin plate), and this amorphous thin plate 1 is formed into the above-mentioned comb-tooth shape by an etching method. 1' is the comb tooth portion, and 1'' is its base. The width t of the comb tooth portion 1' is formed to be equal to the track width of the magnetic head.

The comb-shaped amorphous thin plate 1 is placed around a cylindrical holding member 4 having a winding hole 2 shown in FIG. 2 and a notch 3 communicating with the winding hole 2, as shown in FIG. Then, both ends of the amorphous thin plate 1, that is, the comb-shaped comb teeth 1' and the base 1'' are joined via the non-magnetic material 5 to form an operating gap.This operation The gap is formed by joining both end portions of the amorphous thin plate 1 so that the surfaces on the same side are arranged opposite to each other via the non-magnetic material 5.

Furthermore, the non-magnetic material 5 serving as the operating gap is arranged so as to be on the same straight line as the notch 3 of the cylindrical holding member 4, and the sliding body and clamping body 6 having an arcuate cross section as shown in FIG. Clamp and secure. This sliding body/clamping body 6 is made of heat-resistant and shrinkable material such as thermosetting plastic or spring material, and uses the heat shrinkage force to crimp and clamp the above-mentioned operating gap. Try to keep the working gap width constant.

FIG. 4B is a view of FIG. 4A viewed from the direction of the sliding surface of the magnetic tape, and 7 shows the faces of the same side of both ends of the comb-like amorphous thin plate 1 disposed opposite to each other with the non-magnetic material 5 interposed therebetween. This is the void that occurs when

As shown in FIG. 5, this gap 7 is filled with a nonmagnetic material 8 that can be processed at a temperature below the crystallization temperature at which the magnetic properties of the amorphous thin plate 1 deteriorate. This material is preferably a low softening point powdered glass, metal solder, or resin that can be melted and filled at a temperature of 400°C or lower.

Thereafter, as shown in FIG. 6, the part with the working gap is polished to a desired curved surface R, and
Complete as shown in Figures 7A and B.

7A is a view from the magnetic path surface, and FIG. 7B is a view from the magnetic tape sliding surface. As is clear from these figures, the multitrack magnetic head 9 is constructed.

Further, by cutting along broken lines X and Y shown in FIG. 7B, the single track magnetic head 10 shown in FIG. 8 is constructed.

By using a ferromagnetic material such as sendust or ferrite for the cylindrical holding member 4 shown in FIG. 2, the magnetic resistance of the core portion of the magnetic head is reduced by the amorphous thin plate 1 of the comb gear and this holding member 4. This has the effect of increasing the magnetic flux efficiency of the magnetic head core.

The present invention provides a magnetic head and a method for manufacturing the same as described above in detail, thereby producing a multitrack magnetic head for high-density recording by effectively utilizing the characteristics of an amorphous metal magnetic thin plate. It has the advantage that magnetic heads for single tracks can be manufactured easily and in large quantities.

[Brief explanation of the drawing]

The figures show an embodiment of the magnetic head and its manufacturing method according to the present invention, in which Fig. 1 is a perspective view of a comb-like amorphous metal magnetic thin plate, and Fig. 2 shows a cylindrical holding member. FIG. 3 is a front sectional view showing the comb-like amorphous metal magnetic material thin plate wound around the cylindrical holding member, and FIG. 4A is the one shown in FIG. 3. A front cross-sectional view of the sliding body and clamping body attached, FIG.
The figure is a side sectional view showing the polished curved surface part before finishing the polishing, FIG. 7A is a front sectional view of the multitrack magnetic head after finishing the polishing, FIG. FIG. 7 is a plan view of a single track magnetic head obtained by cutting from the one in FIG. 7; 1... Amorphous thin plate (amorphous metal magnetic material thin plate), 4... Cylindrical holding member, 5... Nonmagnetic material,
6... Sliding body and clamping body, 7... Air gap, 8... Non-magnetic material, 9... Magnetic head for multi-track,
10...Magnetic head for single track.

Claims (1)

[Scope of Claims] 1. A single or laminated thin plate of amorphous metal magnetic material formed in a comb tooth shape is formed into a ring shape by curving the comb tooth portions, and the ring shape is supported from the inside of the ring shape. A magnetic head comprising: a cylindrical holding member made of a ferromagnetic material, and further configured such that both ends of the thin plate of amorphous metal magnetic material are held by a sliding body/holding member via a non-magnetic material. 2. Wrap a single or laminated amorphous metal magnetic thin plate formed in a comb shape around a cylindrical holding member made of a ferromagnetic material in a ring shape with the comb teeth curved; A method for manufacturing a magnetic head in which both ends of a thin metal plate of magnetic material are held together by a sliding member and a holding member so that the surfaces on the same side face each other with a non-magnetic material in between to form an operating gap. . 3. A gap surrounded by a ring-shaped curved end of a thin plate of amorphous metal magnetic material formed in a comb shape, a sliding body/clamping part, and the working gap is used for crystallization of the amorphous metal magnetic material. 3. The method of manufacturing a magnetic head according to claim 2, wherein the non-magnetic material is melted and filled at a temperature below that temperature.