JPS62143216A - Composite type magnetic head - Google Patents

Abstract

PURPOSE:To reduce size and to improve efficiency and productivity by providing a coil to the end face at the bottom end of a core, providing a connecting member consisting of a magnetic material and magnetically connecting thin magnetic alloy films provided on the inside surfaces of a C core and I core through the central part of the coil. CONSTITUTION:The coil 7 is provided by a patterning or lithographic means on the thin magnetic alloy film 2a provided on the bottom end face of the I core 2. More specifically, the coil is formed by successively laminating, for example, an SiO2 insulating film, Cu film and photoresist film on the thin magnetic alloy film 2a, and exposing a spiral coil pattern thereto, then immersing the core into an etching soln. The coil surface is coated with the SiO2 insulating film except terminal parts. A connecting member 8 is formed to have an L- shaped longitudinal section by a magnetic material having the saturation flux density equal to or higher than the saturation flux density of the thin magnetic alloy film. The member 8 is so disposed as to magnetically connect the thin films 1a and 2a provided to the C core 1 and the I core 2 through the central part of the coil 7. The magnetic circuit having a magnetic gap 4 is thereby formed and the magnetic head provided with the coil 7 is constituted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic disk that performs processing such as reading and writing magnetic recording with a magnetic recording medium, and particularly relates to a magnetic disk that performs processing such as reading and writing magnetic recording with a magnetic recording medium. The present invention relates to an improvement of a so-called composite magnetic head formed by the provided structural members.

[Conventional technology]

Conventional composite magnetic heads are made of Mn-Zn ferrite or Mn0-Ni0, for example, as schematically shown in FIG.
C core 1 and core 2 are made of non-magnetic oxide such as Co-Zr amorphous alloy or F.
e-Aj! -5i magnetic alloy thin films 1a, 2 such as crystalline alloy
Generally, a film is formed by forming a film by means such as sputtering. That is, on the upper end surface 3 facing the magnetic recording medium.

A magnetic circuit is formed by combining C core 1 and (2) core 2 so that a magnetic gap 4 appears, and (2) a coil 5 is provided around core 2.

[Problem that the invention seeks to solve]

In recent years, with the increase in capacity and speed of computers, there has been a demand for even higher density in 2F storage devices and the like.

High-density recording requires operation in a high frequency range, but this requires increasing the resonant frequency of the device itself, which requires miniaturization of the magnetic head, that is, a thinner core and coil. It will be necessary to make the device smaller, smaller, and flatter. However, in the conventional device, since the coil 5 is formed by winding after the C core 1 and the (2) core 2 are combined, the first winding window 6 must be made thicker than necessary. Therefore C core 1 and I
It was not possible to reduce the size of the core 2, and the magnetic resistance was also prevented from being reduced, making it impossible to achieve miniaturization and high efficiency of the magnetic head.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional composite magnetic head as described above, and to provide a composite magnetic head that is compact, highly efficient, and highly productive.

[Means for solving the problems] In order to achieve the above object, the following technical means were adopted in the three present inventions. Namely.

A. A composite magnetic head in which the constituent members are a C core and an I core with a magnetic alloy thin film provided on the inner surface, and a magnetic gap appears on the surface facing the magnetic recording medium at the upper end.

B. A coil is provided by patterning on the end face of either the lower end of the C core or the lower end of the I core.

C0 A connecting member made of a magnetic material having a saturation magnetic flux density equal to or higher than that of the magnetic alloy thin film is provided.

D. Magnetically connecting the magnetic alloy thin films provided on the inner surfaces of the C core and I core by penetrating the center portion of the coil.

This is a technical measure taken.

〔Example〕

FIG. 1 is a partially sectional front view schematically showing an embodiment of the present invention, and the same parts are designated by the same reference numerals as in FIG. 3. In the figure, 7 is a coil.

(2) Provided on the magnetic alloy thin film 2a provided on the lower end surface of the core 2 by patterning or lithography. That is, on the magnetic alloy thin film 2a, 1, for example, S i 02
The i@marginal film, Cu1J and photoresist film were sequentially laminated, a spiral coil pattern was exposed, and then immersed in an etching solution to form a coil.
Cover the coil surface with an insulating film. Next, a connecting member 8 is made of a magnetic material having a saturation magnetic flux density equal to or higher than that of the magnetic alloy thin film, and is formed into an L-shaped cross section.

The connecting member 8 passes through the center of the coil 7,
The magnetic alloy thin films 1a and 2a provided on the C core 1 and the C core 2 are arranged so as to be magnetically connected.

With the configuration described above, a magnetic circuit having a magnetic gap 4 is formed, and a magnetic head is configured in which the coil 7 is provided in the magnetic circuit. Processing such as writing can be performed.

FIG. 2 is a longitudinal sectional view of a main part showing another embodiment of the present invention, and the same parts are designated by the same reference numerals as in FIG. 1. As shown in the figure, a magnetic alloy thin film 1a is provided on the lower end surface of the C core 1, a coil 7 is provided thereon by the same patterning or lithography method as in the above embodiment, and a connecting member 8 connects the C core 1' and The magnetic alloy thin films 1a and 2a provided on the I core 2 are magnetically connected.

Thus, the operation is the same as in the previous embodiment.

In this embodiment, a magnetic alloy thin film is provided on the end face of the C core or I core, and a coil is provided thereon by patterning or lithography.
Even if it is provided directly on the end face of the core or I-core without intervening the thin film, it is sufficient to connect it magnetically so as to form a magnetic circuit using the connecting member. Moreover, both FIG. 1 and FIG. 2 schematically show the coil and the connecting member.

Although it appears in a block shape, the effect is the same even if the connecting member is in the form of a thin film formed by means such as sputtering.

〔Effect of the invention〕

Since the composite magnetic head of the present invention has the configuration as described above, it can achieve the following effects.

(1) There is no need to ensure a large winding window.

The magnetic circuit can be made narrower, and the magnetic head can be made smaller.

(2) Due to the above-mentioned narrowing or downsizing, the amount of magnetic material is reduced, so the magnetic resistance is reduced.

The efficiency of the magnetic head becomes extremely high.

(3) The coil is installed directly on the core end face by patterning or lithography.
Manual work can be completely eliminated, greatly improving productivity, eliminating variations in characteristics, and contributing to improved quality.

[Brief explanation of drawings]

Fig. 1 is a partially sectional front view schematically showing an embodiment of the present invention, Fig. 2 is a vertical sectional view of main parts showing another embodiment of the invention, and Fig. 3 is a schematic diagram of a conventional one. It is a partially sectional front view shown. 1: C core, 2: I core, 5, 7: coil, 8: connection member.

Claims (2)

[Claims] (1) In a composite magnetic head whose constituent members are a C core and an I core each having a magnetic alloy thin film provided on the inner surface thereof, the lower end of the C core is formed so that a magnetic gap appears on the surface facing the magnetic recording medium at the upper end. A patterned coil is provided on the end face of either the lower end of the core or the lower end of the I core, a connecting member made of a magnetic material having a saturation magnetic flux density equal to or higher than that of the magnetic alloy thin film is provided, and a connecting member is provided that penetrates the central portion of the coil. A composite magnetic head characterized in that magnetic alloy thin films provided on the inner surfaces of the C core and the I core are magnetically connected to each other. (2) A composite magnetic head according to claim 1, wherein the connecting member is formed of a magnetic alloy thin film.