JPH0546915A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head which facilitates the checking of apex in a magnetic head having a pair of substrates sealed with a sealing glass by providing a magnetic body on a butted surface of the pair of substrates and a gap glass at gap parts facing each other of the magnetic body. CONSTITUTION:A cobalt based amorphous alloy magnetic body or a cobalt based super structure nitride alloy magnetic body are arranged on a butted surface of a pair of substrates mainly composed of Fe2O3 and WO3 and a gap glass is provided at gap parts facing each other of the magnetic body. The pair of substrates are sealed with a sealing glass which is mainly composed of Fe2O3 and WO3 and a gap glass is provided at gap blow 600 deg.C. This checks mutual reaction between the substrates and the sealing glass to reduce the separation of the components of the substrates in the sealing glass thereby facilitating the checking of apex.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art With the miniaturization and high capacity of magnetic disk devices, there is a strong demand for the development of a magnetic head which is compatible with a high coercive force medium and enables a high recording density. In order to respond to this, for example, MIG in which a cobalt-based amorphous alloy magnetic material or a cobalt-based superstructure nitride alloy magnetic material (cobalt-niobium-zircon-tantalum alloy film or this nitride film, hereinafter abbreviated as magnetic material) is sputtered in the gap portion. (Metal in gap) heads have been developed. FIG. 5 shows a typical structure of a MIG head using a ferrite substrate. A pair of ferrite substrates 1
The magnetic body 2 facing the gap part of the is formed by sputtering, the gap is filled with the gap glass 3, bonded by the amorphous sealing glass 4, and finally the coil (not shown) is wound. It is configured.

FIG. 6 shows a typical structure of a laminated head using a nonmagnetic ceramic substrate. On the side surface of the non-magnetic ceramic substrate 6, there are track portions 7 in which magnetic substances and SiO ₂ are alternately laminated, and the substrate 6 is adhered to the substrate 8 by a crystallized glass 9. The gap is filled with a gap glass 3, joined by an amorphous sealing glass 4, and finally wound with a coil (not shown).

Here, the working temperature of the amorphous sealing glass 4 must be 600 ° C. or lower so as not to impair the magnetic properties of the magnetic substance.

Further, in recent years, with the miniaturization of the VTR with a built-in camera, the diameter of the cylinder for mounting the magnetic head tends to be reduced. At this time, in a conventional magnetic head using a ferrite substrate or a non-magnetic ceramic substrate, jitter (head tapping) easily occurs due to friction between the recording tape and the head, which causes a problem that accurate recording and reproduction cannot be performed. It was In order to solve this problem, a ceramic substrate containing Fe ₂ O ₃ and WO ₃ as main components, which is well compatible with a tape, has been studied as a substrate.

[0006]

The sealing glass 4 must be sufficiently softened and flown during the work for bonding the substrates to each other. At this time, the ceramic substrate containing Fe ₂ O ₃ and WO ₃ as main components and the sealing glass 4 are sealed. The mutual reaction with the glass was likely to occur. As a result, the substrate components are precipitated in the sealing glass,
Apex through sealing glass (5 in FIGS. 5 and 6)
Was difficult to confirm and it was difficult to adjust the gap depth to a predetermined value.

It is an object of the present invention to solve the above problems and provide a magnetic head in which the apex can be easily confirmed.

[0008]

In order to achieve the above object, the magnetic head of the present invention comprises TeO ₂ , PbO and B.
Sealing is performed with sealing glass containing ₂ O ₃ and CdO as main components and having a working temperature of 600 ° C. or less.

[0009]

With the above-mentioned structure of the present invention, the mutual reaction between the sealing glass and the substrate is suppressed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

Example 1 FIG. 1 shows that PbO = 5 by weight%.
3.5%, B ₂ O ₃ = 14.4%, ZnO = 8.5%, T
eO ₂ = 5.6%, Bi ₂ O ₃ = 11.2%, CdO =
8.0% sealing glass (coefficient of thermal expansion 103 × 10 ⁻⁷ /
℃, working temperature 480 ℃) Fe ₂ O ₃ : WO ₃ = 10: 9
It is a structure photograph of 2000 times the interface between the substrate and the sealing glass when used for 0 (mol%) substrate. On the other hand, FIG. 2 shows PbO = 82% and B ₂ O ₃ =% by weight as a comparative example.
9.7%, SiO ₂ = 5%, Al ₂ O ₃ = 3%, As ₂ O ₃
= 0.3% (coefficient of thermal expansion: 107 x 10 ^-7 / ° C, working temperature: 480 ° C) is a structure photograph of the interface between the substrate and the sealing glass at 2000 times when the same substrate is used.

As is clear from FIG. 1, TeO ₂ , PbO,
In the sealing glass containing B ₂ O ₃ and CdO as the main components, no precipitation of the substrate component was observed in the sealing glass, which is observed in FIG. That is, it is apparent that the sealing glass of the present invention is excellent in the effect of suppressing the mutual reaction with the substrate.

FIG. 3 is an apex 5 when a magnetic head having the same structure as that of FIG. 5 is manufactured using the sealing glass of this embodiment.
It is a 165 times larger structure photograph. On the other hand, FIG. 4 is a structural photograph of a 165 times larger apex when a magnetic head having the same structure as that of FIG. 5 is manufactured by using a conventional sealing glass as a comparative example. Here, the magnetic substance is an amorphous alloy film composed of cobalt-niobium-zircon-tantalum (for example, Yuji Omata et al., National Technical Report, 31,136 (1985)).
A thing) is described in.

As is clear from FIG. 3, TeO ₂ , PbO,
In the sealing glass containing B ₂ O ₃ and CdO as the main components, no precipitation of the substrate component was observed in the sealing glass, which is observed in FIG. As described above, the sealing glass of the present invention is excellent in the effect of suppressing the mutual reaction with the substrate, and it is clear that the gap depth can be easily adjusted to a predetermined value.

(Example 2) PbO = 40% by weight, B
₂ O ₃ = 20%, CdO = 10%, TeO ₂ = 25%, Z
Sealing glass with nO = 5% (coefficient of thermal expansion 100 × 10 ⁻⁷ /
C., working temperature of 550.degree. C.) was used to manufacture a magnetic head having the same structure as in FIG. On the other hand, as a comparative example, weight% SiO ₂ = 15.2%, B ₂ O ₃ = 6.8%, PbO = 7.
2.7%, ZnO = 1.2%, Al ₂ O ₃ = 2.1%, K
₂ O = 1.9% glass (coefficient of thermal expansion 98 × 10 ⁻⁷ /
C., working temperature of 550.degree. C.) was used to manufacture a magnetic head having the same configuration as in FIG. Here, the magnetic material is cobalt-niobium-
Zircon-tantalum superstructure nitride alloy film (for example, Hiroshi Sakaki et al. IEICE technical report MR-
86-4 (1986), 87-14 (1987)). As a result, similarly to Example 1, the sealing glass of the present invention was excellent in the effect of suppressing the mutual reaction with the substrate, and had the effect of making it easy to adjust the gap depth to a predetermined value.

[0016]

As described above, by using the sealing glass of the present invention, a magnetic head whose apex can be easily confirmed can be obtained.

[Brief description of drawings]

FIG. 1 is a structure photograph of the interaction between the sealing glass of the present invention and a substrate.

[Fig.2] Photograph of structure of interaction between conventional sealing glass and substrate

FIG. 3 is a structural photograph of the apex of the magnetic head of the present invention.

FIG. 4 is a structural photograph of an apex of a conventional magnetic head.

FIG. 5 is a perspective view of a conventional MIG head.

FIG. 6 is a perspective view of a conventional laminated head.

[Explanation of symbols]

 1 Substrate 2 Magnetic Material 3 Gap Glass 4 Sealing Glass 5 Apex 6,8 Substrate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Yoshida 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A pair of substrates mainly composed of Fe ₂ O ₃ and WO ₃ are provided with opposing magnetic bodies made of a cobalt-based amorphous alloy or a cobalt-based superstructure nitriding alloy on their abutting surfaces, and the opposing magnetic properties are provided. A gap glass is provided in the gap part of the body, and the pair of substrates are made of TeO ₂ , PbO, B ₂ O ₃ ,
A magnetic head that is sealed with a sealing glass containing CdO as a main component and having a working temperature of 600 ° C. or less. 2. A track portion in which magnetic materials composed of silicon oxide and a cobalt-based amorphous alloy or a cobalt-based superstructure nitride alloy are alternately laminated between a pair of substrates containing Fe ₂ O ₃ and WO ₃ as main components. A gap glass is provided in the gap between the abutting surfaces of the one magnetic core consisting of the magnetic core and the other magnetic core having the same structure as the above magnetic core, and the pair of magnetic cores are
A magnetic head sealed with a sealing glass containing eO ₂ , PbO, B ₂ O ₃ , and CdO as a main component and having a working temperature of 600 ° C. or less.