JPS60224113A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a head which improves wear resistance and prevents generation of tape squeaking by making the wear resistance of an insulating layer constituting the laminate of a magnetic core together with thin high permeability magnetic sheets higher than the wear resistance of said thin sheets and incorporating an org. lubricating agent into a fixing material for the magnetic core in the case. CONSTITUTION:The magnetic core 1 is formed by butting magnetic core halves 1a, 1b to each other and the head is constituted of said core and the laminate formed by laminating a prescribed number of the thin core sheets 3 formed of the thin high permeability magnetic sheets each having the same shape as the shape of said core via an insulating layer 4 consisting of any among metallic oxide, metallic carbide, metallic nitride, metallic boride and metallic silicide or the combination thereof as pulverous inorg. particles. The same adhesive agent as the insulating adhesive agent constituting the layer 4, for example, epoxy resin, is used as the fixing agent 6 to fix the core 1 into the case 5 and >=1 kinds of org. lubricating agents such as higher fatty acid (ester), fatty acid amide and polyalkylene glycol are incorporated therein. The wear resistance of the layer 4 is thus made higher than the wear resistance of the sheets 3 and the magnetic head having a long life is obtd.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a magnetic head, and in particular, a magnetic core made of a laminate made of high permeability magnetic thin plates laminated with an insulating layer interposed therebetween is fitted into a case. The present invention relates to a magnetic head having a structure in which a magnetic core is fixed by being filled with a fixing material.

[Prior art]

In this type of magnetic head, information is recorded and reproduced by sliding the magnetic recording medium on the magnetic recording medium sliding surface of the magnetic head facing the magnetic core. Wear occurs on the dynamic surfaces and magnetic core.

Due to the occurrence of this wear, the recording/reproducing characteristics of the magnetic head first begin to deteriorate in the high frequency range, and then, as the wear progresses, they begin to deteriorate in the entire frequency range.

In order to solve this problem, in this type of magnetic head, high hardness and insulating inorganic fine particles such as A7,03 are added to the insulating adhesive constituting the insulating layer of the above-mentioned laminate. The technology to improve the wear resistance of the core was published in 1974.
This method is known from Japanese Patent Application Laid-open No. 116209-116209 and Japanese Patent Application Laid-open No. 116210-1983.

However, with this structure, the surface of the magnetic tape of the recording medium is scratched by the inorganic fine particles in the insulating layer.
Magnetic powder, binder, etc. on the tape surface peel off and migrate to the fixing material on the sliding surface of the magnetic head and the magnetic core side.
Causes stickiness.

As a result, uneven running of the magnetic tape occurs due to the relationship between the tension of the sliding magnetic tape and the above-mentioned adhesive force, and sliding noise is generated between the magnetic head and the magnetic tape. 4. So-called tape squeal, which contains noise from the fundamental wave of KH2 and its harmonics, occurred.

Therefore, as a countermeasure against this problem, in addition to inorganic fine particles, an organic lubricant is added to the insulating adhesive of the insulating layer described above, and its lubricating action lowers the friction coefficient of the sliding surface, causing scratches on the magnetic tape. The technology aimed at preventing sticking was developed in 1983.
It is known from Publication No. 71816 and the like.

However, according to this structure, the area occupied by the insulating layer on the entire sliding surface of the head is very small, so the above-mentioned lubricating effect is small, and a sufficient tape squeal prevention effect cannot be obtained.

〔the purpose〕

The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide a magnetic head of this type that can improve wear resistance and prevent the occurrence of tape squeal for a long period of time. The purpose is

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figures 1 and 2 show the structure of the magnetic head of this embodiment, with Figure 1 being a perspective view in a broken state, and Figure 2 being a front view seen from the sliding surface of the magnetic recording medium. be.

In both figures, reference numerals 1a and 1b are half cores that are butted against each other to form the magnetic core 1, and a predetermined number of core thin plates 30 made of high magnetic permeability magnetic thin plates having the same shape as these are inorganic fine particles. It is constructed as a laminate formed by laminating each other with an insulating layer 4 made of an insulating adhesive added thereto.

Here, the above-mentioned insulating layer 4 insulates the core thin plates 3 from each other to reduce the blue current loss of the magnetic core, and the insulating adhesive constituting this layer is urethane-based, rubber-based, unsaturated polyester-based, An epoxy resin or the like is used, and usually an epoxy resin is used.

In this embodiment, the insulating layer 4 is designed to have a higher wear resistance than the core plate 3.

For this purpose, as the above-mentioned inorganic fine particles, one made of gold layer oxide, metal nitride, metal carbide, metal boride, or metal silicide is used. Of course, a combination of a plurality of types of fine particles among these may be used.

The thickness is preferably within the range of 15 μm. The reason for this is that if the particle size is 15 μm or more, the thickness of the insulating layer 4, that is, the spacing between the thin core plates 3, becomes too large, resulting in a decrease in the effective track width of the magnetic core 1 and a deterioration in the characteristics of the magnetic head.
On the other hand, if the particle size is 0.5 μm or less, unevenness of approximately ±0.2 μm exists on the surface of the thin core plate 30, making it difficult to prevent the opposing convex portions of the thin core plates 3 from touching each other. This is because the insulation between the core thin plates 3 becomes poor.

Further, it is preferable that the amount of inorganic fine particles added to the above-mentioned insulating adhesive is approximately 70% by weight or less; if the amount is larger than this, the adhesive force of the insulating layer 4 will be weakened.

The core halves 1a and 1b formed by stacking the core thin plates 3 are butted together through an insulating layer 4 made of an insulating adhesive containing inorganic fine particles as described above, and a magnetic gap 2 is formed on the abutting surfaces of the heads. A magnetic core 1 is constructed by joining them together.

The magnetic core 1 is placed in the rear part on the opposite side of the magnetic gap 2. (4 in the case of Figure 2)
pieces) are fitted.

The upper surface of the case 5 is formed as a magnetic recording medium sliding surface (hereinafter abbreviated as sliding surface) 5a that slides on a magnetic tape (not shown) running in the direction shown by arrow A in FIG.
An opening 5b is formed in the sliding surface 5a, and the magnetic gap 2 of each magnetic core 1 faces the opening 5b.

By filling the case 5 with a fixing material 6, the magnetic core 1 is fixed within the case 5, thereby forming a magnetic head.

Here, as the above-mentioned fixing material 6, the same epoxy resin as the insulating adhesive constituting the above-mentioned insulating layer 4 is used, but especially in this embodiment, this fixing material B contains an organic lubricant. has been done.

As this organic lubricant, a wide range of lubricants used in various fields can be used, but particularly preferred ones include metal soaps, higher fatty acid esters, higher fatty acids, higher alcohols, amines, and silicones. Examples include oils, fatty acid amides, olefin polymers, polyalkylene glycols, halogenated hydrocarbon oils, and the like. Of course, a combination of a plurality of these types may be used.

Further, the effect of the present invention due to the anti-slip effect of this organic lubricant on the resin of the fixing material 6 cannot be obtained, and if the amount is 30% by weight or more, the dimensional change of the fixing material 6 becomes large.

As described above, according to this embodiment, the insulating layer 4 of the laminate of the core halves 1a and jb constituting the magnetic core 1 is configured to have higher wear resistance than the core thin plate 3. The wear resistance of the entire magnetic core 2 is improved.

In addition, the fixing material 6 contains an organic lubricant, and since the fixing material 6 faces the opening 5b occupying a large area on the sliding surface 5a of the case 5, the lubrication effect of the organic lubricant is enhanced. If this is done satisfactorily, the sliding friction between the multiple sliding surfaces and the magnetic tape is reduced, tape squeal is prevented, and the wear resistance of the magnetic core is further enhanced.

Incidentally, in order to confirm the effects of the present embodiment described above, the results of the wear test and the tape squeal test conducted on the magnetic head according to the present embodiment and the magnetic head having the conventional structure will be described below.

First, as the insulating layer material constituting the magnetic core laminate described above, (4) epoxy resin alone, (B) epoxy resin with 50% by weight of A-203 fine particles added as inorganic fine particles, (C) ) 10% by weight of methylpolysiloxane, which is a type of silicone oil, is added as an organic lubricant to the material (B), and (b) the above AJ! material is added to the epoxy resin. ! Four types were prepared: one containing 25% by weight of 203 fine particles.

Next, four types of magnetic cores were constructed using the above four types of insulating layer materials separately. That is, the above-mentioned core thin plate was formed from a permalloy thin plate with a thickness of 0.1 mm, the above-mentioned insulating layer material was applied to one side of this core thin plate, and six pieces were laminated to form a half core. Two core halves with m gaps were polished with a whetstone to a mirror finish, and then butted and joined through a predetermined gap to form a magnetic core.

On the other hand, as a fixing material for the magnetic core, (a) epoxy resin with 50% by weight of CACM and fine particles added, (b) 10% by weight of the above-mentioned methylpolysiloxane added to the fixing material of (a). We prepared two types.

These two types of fixing materials (a) and (b) and four types of magnetic cores corresponding to the four types of insulating layer materials (b) described above are combined as shown in Table 1 below to create a magnetic After the core was filled and fixed in the case with a fixing material, the sliding surface of the case was polished to a mirror finish with a radius of IOR, and five types of magnetic head samples (1) to (5) were prepared as shown in the table. ), and six samples of each were prepared.

Table 1 As shown in Table 1, samples (1) to (3) have the conventional structure, and samples (4) and (5) have the structure of this embodiment.

Next, each sample was subjected to an abrasion test and a tape squeal test.

In the wear test, γ was applied to the magnetic head of each sample.
-Magnetic tape coated with iron oxide at a temperature of 40'C and a humidity of 7.
The sample was continuously slid at a speed of 4.75 cm/sec in an atmosphere of 5 cm, and the amount of wear (depth) of the magnetic core of each sample was measured 200 hours after the start of sliding. The average value was calculated.

In addition, in the tape squeal test, the above-mentioned magnetic tape was continuously slid against the magnetic head of each sample at a speed of 4.75 cm/sec in an atmosphere with a temperature of 55°C and a humidity of 50°C. The elapsed time from the start of sliding to the occurrence of tape squeal was measured, and the average value for each sample was calculated.

The results of both tests are shown in Table 2 below.

Table 2 - As shown in Table 2, samples (4) and (5) according to the embodiments of the present invention are superior to the conventional sample (1) in terms of wear amount.
None of 1 to (3) are worse. In addition, samples (4) and (5) according to the embodiment of the present invention have a significantly longer tape squeal generation time than any of the conventional samples (1) to (3).

That is, it can be confirmed that according to the configuration of the embodiment of the present invention, high abrasion resistance and excellent tape squeal prevention effects can be obtained as described above.

〔effect〕

As is clear from the above description, according to the magnetic head of the present invention, the abrasion resistance of the insulating layer that constitutes the laminate of the magnetic core together with the high permeability magnetic thin plate is higher than that of the thin plate. In addition, the fixing material filled in the case and fixing the magnetic core contains an organic lubricant, so the structure of the insulating layer and the lubricating action of the organic lubricant prevent magnetic In addition to improving the wear resistance of the core, the above-mentioned lubricating action prevents the occurrence of tape squeal, resulting in the excellent effect that appropriate output characteristics can be obtained over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of a magnetic head according to an embodiment of the present invention, and FIG. 2 shows a recording medium 1...magnetic cores 1a, jb...core half 2... of the Yamaki head of FIG. Magnetic gap 6...Core thin plate 4...Insulating layer 5...Case 6...Fixing material 7...Winding 8...Connection terminal Patent applicant Canon Electronics Co., Ltd.

Claims (1)

[Scope of Claims] 1) A magnetic core made of a laminate of high magnetic permeability magnetic thin plates laminated with an insulating layer made of an insulating adhesive and inorganic fine particles interposed therebetween is fitted into a case, and a fixing material is placed inside the case. In the magnetic head in which the magnetic core is fixed by filling the insulating layer with Features a magnetic head. 2) Claim 1 is characterized in that the inorganic fine particles are made of at least one of metal oxides, metal carbides, metal nitrides, metal borides, and metal silicides. The magnetic head described. 3) As the organic lubricant, metal soap, higher fatty acid ester, higher fatty acid, higher alcohol, Ryotaso rice.
So II' =+-n9 Yukasu B1211'#Enemy Maguni◆
J-1/The magnetic head according to claim 1 or 2, which uses at least one of fin polymers, polyalkylene glycols, and halogenated hydrocarbon oils. .