JPS59167816A - Magnetic head of horizontal magnetizing system - Google Patents

Abstract

PURPOSE:To attain the maintenance of lubricity for a long time by using a glass carbon material aggregate or the like for a support body of a magnetic head core. CONSTITUTION:The support of the magnetic head core is constituted by the glass carbon material aggregate or the like, and the material is a glass carbon material or the like obtained by carbonizing a thermosetting resin and has a proper antifriction performance where the carbon material itself is worn beforehand before the surface film is scratched and damaged when a magnetic recording medium is slid. Thus, the lubricity is maintained for a long time without using any lubricant between the magnetic head and the magnetic recording medium, and also the surface of the magnetic recording medium is not damaged and the wear of the aggregate itself is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a magnetic head that writes to and reads from a magnetic recording medium using a horizontal magnetization method. In particular, the present invention relates to improvements in supporting materials for helad cores of magnetic heads suitable for performing high-density magnetic recording using the horizontal magnetization method.

[Description of prior art]

BACKGROUND ART In magnetic recording devices such as audio tape recorders and video tape recorders, a horizontal magnetization recording method in which magnetic particles are magnetized in a direction horizontal to the running direction of a magnetic recording medium is currently widely used. This magnetic recording device is
With the trend toward higher performance and ultra-miniaturization of devices, expectations for high-density magnetic recording are increasing.

In order to realize high-density magnetic recording, it is necessary to use a magnetic recording medium with high coercive force, and therefore it is desired to develop a magnetic head with high magnetic strength during recording. That is, a magnetic head capable of handling a magnetic recording medium with high coercive force must generate a strong leakage magnetic field at the front gap. Currently, for example, the core material of a general-purpose video magnetic head is a magnetic material. This magnetic material has
From the viewpoint of the balance of head characteristic factors and workability, Mn--Zn ferrite materials are mainly used.

However, it is difficult to develop magnetism using such oxide-based magnetic materials.
When the recording current is increased to magnetize a high-coercivity magnetic recording medium, such as a metal tape, the head chip becomes saturated and the recording magnetic field distribution widens, making it impossible to sufficiently magnetize the tape. It cannot be used with tape.

Generally, the saturation magnetic flux density (Bs) of the magnetic material used in a magnetic head is required to be about 6 times or more than the coercive force (Hc) of the magnetic recording medium. For example, when Bs is about 5
In a magnetic head using Mn-Zn ferrite of 000 G (Gauss), Hc is about 1000 to 120000e.
(Oersted)'s high coercive force magnetic recording media cannot perform sufficient recording.

Therefore, oxide-based magnetic materials such as Mn-Zn ferrite (for example, sendust alloy and Co-Nb-B
If a metallic magnetic material like an amorphous alloy with a value of s approximately twice that of Mn-Zn ferrite is used in a magnetic head, it will be fully applicable to magnetic recording media with He up to about 150,000e. . Therefore, recently, magnetic heads using this type of metal magnetic material have been developed, but in general, metal magnetic materials have the following characteristics: ■low specific resistance, ■low magnetic permeability in the high frequency band, and ■wear resistance. There are disadvantages such as inferior performance. Of these drawbacks, however, the drawbacks ① and ② may be eliminated by making the metal magnetic material into a thinner ribbon.Moreover, by making the metal magnetic material into a thinner ribbon, it is possible to create a magnetic head with a narrow track width suitable for high-density recording. can do. However, even if the metal is made into a thin ribbon, the above-mentioned problem (2) of wear resistance cannot be solved.

Therefore, attempts have been made to solve this problem by supporting the thin ribbon metal with a material having excellent wear resistance. As materials with excellent wear resistance for supporting thin metal strips, readily available alumina-based ceramics, high-hardness glass, etc., which have high hardness and high surface smoothness, are being adopted. However, since alumina-based ceramics and high-hardness glass are too hard, magnetic heads using this type of support material have poor sliding properties with the magnetic recording medium and have the disadvantage of damaging the magnetic recording medium. there were.

Therefore, in order to overcome this drawback, lubricants are applied to the surface of magnetic recording media, or magnetic recording media are coated with protective films, but even if the lubricant is applied, the lubricant does not work due to volatilization etc. It is difficult to maintain the lubricant for a long time, and the lubricant must be reapplied periodically.In addition, providing a protective film on a magnetic recording medium requires an additional process to cover the protective film, and the magnetic This has the drawback of increasing the distance between the head and the magnetic recording medium, making it difficult to perform high-density magnetic recording.

(Object of the Invention) The present invention provides low frictional resistance and durability without applying a lubricant to the surface of the magnetic recording medium or forming a protective film on the surface of the magnetic recording medium. The object of the present invention is to provide a horizontal magnetization type magnetic head that is abrasive.

[Features of the invention]

The first aspect of the invention is characterized in that the magnetic held core support, on which the magnetic recording medium slides, supports a magnetic held core made of a thin plate or film-like metal magnetic material or oxide-based magnetic material, and on which the magnetic recording medium slides.
The second invention is characterized in that the magnetic helad core support is composed of an aggregate of glassy carbon material, and a composite material containing a glassy carbon material, a thermosetting resin, and/or a carbonaceous filler. It consists of a collection of materials.

Hereinafter, the present invention will be supplementarily explained.

The support of the magnetic hend core of the present invention is composed of an aggregate of glassy carbon material. This glassy carbon material is a glassy carbon material obtained by carbonizing a thermosetting resin, a glassy carbon material obtained by carbonizing a thermosetting resin modified by copolymerization or cocondensation, etc. Alternatively, glassy carbon materials obtained by significantly inhibiting crystallization through chemical treatment during the carbonization process, glassy carbon materials obtained by thermally decomposing low molecular weight hydrocarbons such as methane, ethylene, and benzene in the gas phase, etc. Specifically, polyacrylonitrile-based glassy carbon materials, rayon-based glassy carbon materials, pinch-based glassy carbon materials, lignin-based glassy carbon materials, phenolic-based glassy carbon materials, and furan-based glassy carbon materials. , alkyd resin glassy carbon material, unsaturated polyester glassy carbon material,
Examples include xylene resin-based glassy carbon materials.

The above-mentioned glassy carbon material is a material having an appropriate anti-friction property that when the magnetic recording medium slides, the carbon material itself wears out first before the surface film of the magnetic recording medium is damaged. It is a glassy-bond material in a crystalline state.

Further, the support of the magnetic henode core of the present invention is composed of an aggregate of a composite material containing a glassy carbon material, a thermosetting resin, and/or a carbonaceous filler. Examples of the thermosetting resin include phenol resin, epoxy resin, polyester resin, furan resin, urea resin, melamine resin, alkyd resin, and xylene resin. Also, carbonaceous filler refers to general carbon materials, such as natural products such as lignin and pitch, which have a high residual carbon content,
Examples include artificial graphite obtained by firing a thermoplastic resin, carbon blank produced by a furnace method or impact method, and naturally produced graphite.

The thermosetting resin acts as a binder that binds the glassy carbon materials to each other or the glassy carbon material and the carbonaceous filler. A robust composite material assembly can be obtained. Further, when carbonizing a thermosetting resin to obtain a glassy carbon material, carbonization becomes easier if the carbonaceous filler is contained in the thermosetting resin. However, if a large amount of thermosetting resin or carbonaceous filler is combined with a glassy carbon material, it will cause a large amount of wear.
Preferably, it is contained in an amount of 50% by volume or more.

As a manufacturing method of the above-mentioned glassy carbon material aggregate or composite material aggregate of glassy carbon material and thermosetting resin etc. which constitute the magnetic head of the present invention, widely known methods such as casting, compression and extrusion are used. Various molding methods can be applied.

[Effects of the Invention] As described above, the glassy carbon material aggregate according to the present invention, or the composite material aggregate containing the glassy carbon material, thermosetting resin, and/or carbonaceous filler, can be used for magnetic recording. It is a material that has an appropriate anti-friction property so that when the medium or its protective film slides, the assembly itself wears out first before the magnetic recording medium or its protective film is damaged. Therefore, by using the above-mentioned material aggregate as a support for a magnetic core made of a metal magnetic material or an oxide-based magnetic material, no lubricant can be used between the magnetic core and the magnetic recording medium. It is possible to obtain an excellent horizontal magnetization type magnetic groove that can maintain lubricity for a long time, does not damage the surface of the magnetic recording medium, and has little wear on the aggregate itself.

Furthermore, due to the conductivity of the glassy carbon material, static electricity is not generated, and dust is less likely to adhere to the magnetic head and magnetic recording medium.

[Explanation based on examples]

Hereinafter, the present invention will be explained in more detail with reference to examples in order to show specific embodiments of the magnetic groove for horizontal magnetization recording of the present invention. It does not limit the technical scope.

(Example I) Appearance ratio M1.5, Shore hardness 112, thermal conductivity 3kc
A glassy carbon material having the characteristics of al/m hr"C is cut into the shape and dimensions shown in Figure 1, and the sliding surface A with the recording medium is coarsely polished and then gradually finely polished, and finally A model head 1 was prepared by mirror finishing with #15000 emery paper.

(Example ■) Appearance: specific gravity 1.45, shore hardness 78, thermal conductivity 15k
A model head with the same shape and dimensions as in Example ■ was produced using a glassy carbon material having the characteristics of cal/…hr”c (Example ■) Phenolic glassy carbon fiber (Japanese Made by Kynol■
A composite glass-like carbon material was obtained by compression molding 70% by volume of Kynol (registered trademark) and 30% by volume of a general-purpose resol resin for lamination. Using this composite glassy carbon material, a model head having the same shape and dimensions was produced in the same manner as in Example (2).

(Example ■) Furan-based glassy carbon material 90% by volume and diameter 0.
A model head having the same shape and size was prepared in the same manner as in Example (2) using a composite material aggregate consisting of 10% by volume of 1 μm carbon black.

(Comparative Example ■) A model head having the same shape and dimensions as in Example ■ was produced using alumina ceramics (manufactured by Nippon Electric Glass ■, trade name: Neoceram) in the same manner as in Example ■.

(Sliding property test) The dynamic friction characteristics of the model heads of Examples 1 to ■ and Comparative Example ■ above and the Co-coated iron oxide coating film, which is a magnetic recording medium, were measured using a friction test device. The conditions of the sliding surface A and the magnetic recording medium film surface were observed with the naked eye.

The results are shown in Table 1. The friction test device used in the measurements is a device that can measure dynamic friction characteristics under conditions close to actual usage conditions, as described in Japanese Patent Laid-Open No. 55-128142. Furthermore, "comprehensive judgment" in the table means the judgment result obtained when both the sliding surface of the magnetic head and the film surface of the magnetic recording medium were comprehensively observed.

Table 1 The Co-adhered γ-iron oxide coating film was prepared using the following compounding ratio.

・Lecithin 0.9 (■ Tribute ratio 1
:l) The above mixture was kneaded in a ball mill for 24 hours to make a magnetic coating, which was then applied onto a polyester film using a 50 μm applicator, subjected to magnetic field orientation, dried with hot air, and then calendered to form a Co-coated coating. Deposition - An iron oxide coating was obtained.

(Example ■) <Preparation of sodocore for magnetic recording> Consists of Co, Fes, Mn5St and B (composition ratio is Co:Fe:Mn:St:B = 71.5:2
．． 5:3.0:8.0:15.0, weight ratio) The alloy was made into a thin plate by a method generally known as the single roll method. When the diffraction pattern of this alloy was examined using an X-ray diffractometer, it was confirmed that this alloy was an amorphous alloy because the diffraction pattern did not show sharp peaks characteristic of crystals.

Next, the amorphous alloy thin plate was polished with alumina oxide having a grain size of 1 to 3 IIWl, and further etched with an etching solution (FeC13
・6H2060g, C2H50H40ml. Cu
Consists of 202 mg of Cl2.2H and 40 ml of H2O. ) and polished with an abrasive cloth to finally form a film with a thickness of 30 μm.

<Preparation of support> The glassy carbon material aggregate used in Example I was prepared with a particle size of 0.
．． It was polished with alumina oxide of 5 to 1.0 pTIl to finally form a thin plate with a thickness of 0.1 m.

<Preparation of magnetic head> The thin plates of the amorphous alloy film and glassy carbon material aggregate described above were cut into predetermined shapes and dimensions, and these were bonded together using an epoxy adhesive (manufactured by Ciba Geigy, trade name: Araldite). 15 insulated copper wires with a diameter of 40 μm
The magnetic head shown in FIG. 2 was manufactured by winding the magnetic head.

In FIG. 2, 2 is a support, 3 is an amorphous alloy film, and 4 is a coil.

In manufacturing the magnetic head, an amorphous alloy film manufactured by sputtering may be used. That is, the magnetic head shown in FIG. 2 can be obtained by laminating an amorphous alloy film by sputtering on a substrate made of a glassy carbon material aggregate, followed by bonding and winding.

(Comparative Example - The amorphous alloy thin plate used in the old Example (2) was polished according to the method of Example (2) to obtain a thin plate with a thickness of 0.23+u*.

Below, this thin plate was cut into a temporary shape and size, and the diameter was 40 mm.
Copper wire with insulation coating of μm is wound with 15 turns, and the third
The magnetic head shown in the figure was manufactured. In Figure 3, the second
The same reference numerals as in the figure indicate the same components.

5 is an amorphous alloy thin plate.

(Characteristics test of magnetic head) The magnetic head manufactured in Example ■ and Comparative Example ■, and the current general-purpose Mn, -Zn ferrite magnetic head for reference (the shape and dimensions of this head are those of the magnetic head manufactured in Comparative Example ■). ) was used to measure the temporal change in the reproduction output value relative to the initial value of the 1000 kHz signal. The results are shown in FIG. In the characteristic diagram of Fig. 4, the vertical axis is the relative reproduction output value, and the horizontal axis is the elapsed time. This is a Mn-Zn ferrite magnetic head.

The magnetic recording medium used in this test was a magnetic tape made by the method described above, and had a coercive force of about 7000.
e, has magnetic properties with a residual magnetic flux density of about 1200 G. The running speed of this magnetic tape is 5.8 m/sec,
Measurements were performed by replacing the magnetic tape with a new one every 50 hours.

Furthermore, using the magnetic tape, the amount of wear on the magnetic throat when the magnetic tape slides was investigated. The running speed of the magnetic tape was 15 m/sec, and the amount of wear was measured after 20 hours. The results are shown in Table 2. In addition, the amount of wear is shown as a relative value when the amount of wear of the magnetic throat of the present invention produced in Example V is set as "1".

Table 2 As is clear from Tables 1, 4, and 2, the magnetic head of the present invention has good sliding properties with the magnetic recording medium, does not damage the magnetic recording medium, and has good wear resistance. It can be seen that the magnetic properties are excellent and the magnetic properties are also good.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a model throat made of a material used in a magnetic head according to an embodiment of the present invention. FIG. 2(a) is an external perspective view of a magnetic head according to an embodiment of the present invention. Fig. 2 (bl is its front view. Fig. 2 (C) is its plan view. Fig. 3 (al is an external perspective view of a comparative example magnetic head. Fig. 3 (bl is its front view. Fig. 3 ( C) is a plan view thereof. Fig. 4 is a characteristic diagram of the magnetic head of the example of the present invention and the magnetic head of the comparative example. 1...Model head, 2...Support, 3...Amorphous alloy film, 4...Coil, 5...Amorphous alloy thin plate.Patent applicant: Kao Soap Co., Ltd. Agent Patent attorney: Naotaka Ide (C) Agency Commissioner Kazuo Wakasugi1, Indication of the case, Patent Application No. 041471 of 1982, Name of the invention, Horizontal magnetization type magnetic head 3, Relationship to the case of the person making the correction Patent applicant address Chuo-ku, Tokyo Nihonbashi Kayabacho-chome 14-10
Title (091) Kao Soap Co., Ltd. Representative Yoshibe Maruta 4, Agent 6 Number of inventions increased by amendment None 8 Contents of amendment (1) The name of the invention in the specification was changed to “magnetism for longitudinal recording method”. "Head" is corrected. (2) Amend the claims of the specification as shown in the attached sheet. (3) Specification, page 2, line 5 to line 7 of the same page [The present invention relates to a magnetic head that writes to and reads from a magnetic recording medium using a horizontal magnetization method. In particular, the present invention relates to a magnetic head that writes to and reads from a magnetic recording medium using a longitudinal recording method. In particular, due to the longitudinal recording method -
...'' and correct it. (4) Specification page 2, line 13 to page 14, r -
Currently, there is a horizontal magnetization recording method in which magnetic particles are magnetized in the horizontal direction with respect to the running direction of the
- A longitudinal recording method in which magnetic particles are magnetized in one longitudinal direction is currently corrected as -'------J. (5) Page 6, line 5 of the specification: ``...and wear-resistant horizontal magnetization method-''
・--1 to -1 and wear-resistant for longitudinal recording method-'' is corrected. (6) Between line 12 and line 13 of page 9 of the specification, ``In the above description, a glassy carbon material aggregate, or a glassy carbon material and a thermosetting resin, etc. Although the composite material aggregate has been described as a support for a magnetic head core, it can be applied not only to a support for a magnetic head core but also to a member on which a magnetic recording medium slides. (7) On page 10, line 7 of the specification, "---excellent horizontal magnetization magnetic head--" was replaced with "-"
・−・Correct the excellent magnetic head for longitudinal recording method as ・−”−. (8) On page 10, line 13 of the specification, "-1--Magnetic head for horizontal magnetization recording of the present invention-" is replaced by r-, "-1-Magnetic head for longitudinal recording method of the present invention-"
and correct it. [Attachment] 2. Claims (11) A magnetic head for a front recording system that is equipped with a magnetic rad core made of a magnetic material and magnetizes magnetic particles in the a+ force direction of a magnetic recording medium, a support that supports the magnetic rad core. A magnetic head for longitudinal recording, characterized in that the body is constituted by an aggregate of glassy carbon material. (2) A magnetic head core made of a magnetic material, which magnetizes magnetic particles in the direction of the magnetic recording medium. A magnetic head for manual recording method, characterized in that the support for supporting the magnetic helad core is composed of a composite material aggregate containing a glassy carbon material, a thermosetting resin, and/or a carbonaceous filler. Magnetic head for longitudinal recording method.

Claims (2)

[Claims] (1) In a horizontal magnetization type magnetic head that is equipped with a magnetic rad core made of a magnetic material and magnetizes magnetic particles in a direction horizontal to the running direction of a magnetic recording medium, the support that supports the magnetic head core is made of glass. A horizontal magnetization type magnetic head characterized by being constructed from a carbon material aggregate. (2) In a horizontal magnetization type magnetic head that includes a magnetic rad core made of a magnetic material and magnetizes magnetic particles in a direction horizontal to the running direction of the magnetic recording medium, the support that supports the magnetic rad core is made of glass. 1. A magnetic head of horizontal magnetization type, characterized in that it is constructed of a composite material aggregate containing a carbon material, a thermosetting resin, and/or a carbonaceous filler.