JPH04325910A - Production of composite type magnetic head - Google Patents

Abstract

PURPOSE:To prevent the generation of glass drop-outs, bubbles and cracks in track width regulating grooves by providing a stage for chamfering the edges on the tape sliding surface side of the surfaces of magnetic core half bodies on which thin ferromagnetic metallic films are formed. CONSTITUTION:The edges on the tape sliding surface side of the surfaces of the ferrite magnetic core half bodies on which the thin ferromagnetic metallic films are formed are chamfered 9. The track width regulating grooves 2 and glass rod insertion grooves 6 are then formed and the plural track width regulating grooves 7 are formed. The thin ferromagnetic metallic films 3 are then formed. The flat parts corresponding to the track width of the magnetic core half bodies are then butted against each other via nonmagnetic gap spacers 4 and the glass rods 5 are inserted into the grooves 2 and the grooves 6. Working gaps are formed by a heat treatment. The glass is packed into the track width regulating grooves 7 to form the magnetic core block in the case of butting of the magnetic core half bodies against each other. The block is then cut to single bodies 8 of the magnetic heads. The glass packing into the grooves 7 is safely executed by chamfering 9 the edge in such a manner.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a composite magnetic head in which a ferromagnetic metal thin film is formed in the vicinity of a magnetic gap.

0002

[Prior Art] In recent years, the density of magnetic tapes used in magnetic recording and reproducing devices such as VTRs has been increasing. Metal tape is now being used. On the other hand, the magnetic head that records on this metal tape is a composite type in which the vicinity of the working gap is made of a magnetic material with a higher saturation magnetization than the ferrite used as the magnetic core (e.g. amorphous magnetic material, sendust, permalloy). A magnetic head has been proposed, and this composite magnetic head has excellent characteristics in terms of reliability, magnetic properties, and wear resistance.

A conventional composite magnetic head will be explained below. FIG. 5 shows an external view of a composite magnetic head, in which 1a and 1b are magnetic core halves made of ferrite, 2 is a winding groove, 3 is a ferromagnetic metal thin film such as an amorphous magnetic material,
4 is a working gap made of SiO2 or the like, and 5 is a core bonding glass.

Each stage of the manufacturing process of the composite magnetic head constructed as described above will be explained below with reference to FIG. 6. First, the winding groove 2 and the glass rod insertion groove 6 (b) are formed on the ferrite magnetic core half body (a) to give it a mirror finish, the track width regulating grooves 7 (c) are formed, and the ferrite magnetic core half (d) is A thin metal film 3 is formed, and the flat parts corresponding to the track width of the magnetic core halves are brought together via a non-magnetic gap spacer 4 made of SiO2 etc. , a glass rod 5 is inserted, a working gap is formed by heat treatment, the magnetic core halves are joined together, and the track width regulating groove 7 is filled with glass to form a magnetic core block. Finished by grinding and polishing the sliding surface.

[0005]

[Problems to be Solved by the Invention] However, in the composite magnetic head manufactured by the above manufacturing process, the formation of the working gap, the joining of the magnetic core halves, and the filling of the track width regulating groove with glass are performed in the same heat treatment, and The glass used in composite magnetic heads that use thin ferromagnetic metal films such as amorphous magnetic materials has a lower melting point than the glass used in ferrite heads, and due to its composition, the flowability of the glass is poor, resulting in a narrow track width. There was a problem in that glass was not completely filled into the regulating grooves, and after the heat treatment was completed, the glass fell out of the track width regulating grooves, and bubbles and cracks occurred.

The present invention solves the above-mentioned conventional problems, and aims to provide a high-yield, cost-effective composite magnetic head that prevents the occurrence of glass leakage, bubbles, and cracks in track width regulating grooves. purpose.

[0007]

[Means for Solving the Problems] In order to achieve this object, in the manufacturing process of the composite magnetic head of the present invention, an edge on the tape sliding surface side of the surface of the magnetic core half on which the ferromagnetic metal thin film is formed. The process involves chamfering at a certain angle.

[0008]

[Function] By providing this manufacturing process, during the heat treatment process for forming the operating gap, core bonding, and filling the track width regulating groove with glass, the glass that has flowed into the track width regulating groove will be moved into the adjacent track due to the chamfer. The glass flowing into the width regulating groove is pulled together to prevent the glass from coming out.
Glass can be filled within track width regulations without causing bubbles or cracks.

[0009]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an external view of a composite magnetic head of the present invention, and the same parts as in FIG. 6 are given the same reference numerals, and the explanation of FIG. 6 is referred to for the explanation thereof.

Each stage of the manufacturing process of the composite magnetic head constructed as described above will be explained below with reference to FIG. First, a chamfer 9 is placed at a certain angle on the tape sliding surface side edge of the ferromagnetic metal thin film forming surface of the ferrite magnetic core half (a), and the winding groove 2 and glass rod insertion groove 6 (b) are cut. A plurality of track width regulating grooves 7 (c) are formed, and a ferromagnetic metal thin film 3 such as an amorphous magnetic material (d) is formed.
The flat parts corresponding to the track width of the two magnetic core halves are butted together via a non-magnetic gap spacer 4 made of SiO2 etc., and the winding groove 2 and the glass rod insertion groove 6 are formed.
A glass rod 5 is inserted, heat treatment is performed to form an operating gap, join the magnetic core halves, and fill the track width regulating groove 7 with glass to form a magnetic core block, which is then cut into f single magnetic heads 8. . In this case, the chamfered portion 9 remains on the magnetic head unit 8, but since the tape sliding surface is formed by grinding and polishing, the shape of the magnetic head unit when completed is the same as the conventional one.

As described above, according to the present embodiment, by providing a step of chamfering the edge of the ferromagnetic metal thin film forming surface on the tape sliding surface side at a certain angle, the working gap is formed and the magnetic core is During the heat treatment process for joining the halves and filling the track width regulating groove with glass, the glass that has flowed into the track width regulating groove attracts the glass that has flowed into the adjacent track width regulating groove to each other, causing glass dropout, bubbles, etc. It becomes possible to fill the track width regulating groove with glass without generating cracks. Of course, the composite magnetic head having the external appearance shown in FIG. 3 is also manufactured using substantially the same manufacturing method as that shown in FIG. 2, although the structure is different, and the same effects as described above can be obtained.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to the drawings. FIG. 4 shows an external view of a composite magnetic head showing a second embodiment of the present invention. Although the structure is slightly different, the same parts as in FIG. to be used.

The manufacturing method of the composite magnetic head constructed as described above is different from the manufacturing method shown in FIG. 2, in that in FIG. The winding groove 2 and the glass insertion groove 6 are formed, and after the track width regulating groove 7 is formed, a ferromagnetic metal thin film 3 such as an amorphous magnetic material is formed, but the composite magnetic head having the appearance shown in FIG. The process before heat treatment is shown in the figure, in which a chamfer 9 is cut at a certain angle into a magnetic core half on which a ferromagnetic metal thin film 3 such as an amorphous magnetic material is formed, and a winding groove 2 and a glass insertion groove 6 are formed. Different from 2.

As described above, in the second embodiment, the chamfered portions are provided on the surface on which the amorphous magnetic material is formed and the edge on the tape sliding surface side, so that the same effect as in the first embodiment can be achieved.
It is possible to fill the track width regulating groove with glass without glass dropout, bubbles, or cracks.

[0016]

As described above, the present invention provides chamfering at a certain angle on the edge of the tape sliding surface side of the surface of the magnetic core half made of ferrite on which a ferromagnetic metal thin film such as an amorphous magnetic material is formed. By providing a process for filling the track width regulating groove with glass, it is possible to safely fill the track width regulating groove with glass in the operation gap formation, core bonding, and heat treatment processes for filling the track width regulating groove with glass, resulting in high yield and cost efficiency. It is possible to manufacture a composite magnetic head with certain characteristics.

[Brief explanation of drawings]

FIG. 1 is an external view of a composite magnetic head in a first embodiment of the present invention.

FIG. 2 is a process diagram showing a method for manufacturing a composite magnetic head in the first embodiment.

[Fig. 3] External view of the composite magnetic head in the first embodiment.

FIG. 4 is an external view of a composite magnetic head in a second embodiment of the present invention.

[Figure 5] External view of a conventional composite magnetic head

[Fig. 6] Process diagram showing a conventional method for manufacturing a composite magnetic head

[Explanation of symbols]

1a Magnetic core half 1b Magnetic core half 2 Winding groove 3 Ferromagnetic metal thin film 4 Non-magnetic gap spacer 5 Glass for core bonding 6 Glass rod insertion groove 7 Track width regulation groove 8 Single magnetic head 9 Chamfered part

Claims (2)

[Claims] Claim 1: A pair of magnetic core halves made of a ferromagnetic oxide on which a ferromagnetic metal thin film is formed is made, and a magnetic gap is formed by butting the ferromagnetic metal thin films against each other via a nonmagnetic material. A method for manufacturing a composite magnetic head, comprising: chamfering the edge of the surface of the ferromagnetic oxide on which the ferromagnetic metal thin film is to be formed, on the side where the tape sliding surface is to be formed; A process of making a surface on which a magnetic metal thin film is formed a mirror surface, a process of forming a winding groove on the surface, and a protrusion having a certain width by forming a plurality of grooves approximately perpendicular to the winding groove. forming a ferromagnetic metal thin film on the mirror-finished surface of the ferromagnetic oxide; and forming a non-magnetic gap spacer on the ferromagnetic metal thin film to match the protrusion to the groove. A method for manufacturing a composite magnetic head, comprising the steps of: filling glass to obtain a magnetic core block; and cutting the magnetic core block to a predetermined thickness and azimuth angle to obtain a single magnetic head. 2. A composite device in which a pair of magnetic core halves made of a ferromagnetic oxide on which a ferromagnetic metal thin film is formed is made, and a magnetic gap is formed by butting the ferromagnetic metal thin films against each other via a nonmagnetic material. A method for manufacturing a type magnetic head, the step of forming a ferromagnetic metal thin film on a ferromagnetic oxide;
A process of chamfering at a certain angle the edge on the tape sliding surface side of the surface of the ferromagnetic metal thin film of the ferromagnetic oxide that formed the ferromagnetic metal thin film, and winding the surface on the ferromagnetic metal thin film. forming a groove and making the metal thin film surface a mirror surface; forming a plurality of grooves substantially perpendicular to the winding groove;
a step of creating a protrusion having a certain width, a step of forming a non-magnetic gap spacer on the ferromagnetic metal thin film, abutting the protrusion, and filling the groove with glass to obtain a magnetic core block. A method for manufacturing a composite magnetic head, comprising the steps of: cutting the magnetic core block to a predetermined thickness and azimuth angle to obtain a single magnetic head.