JPH04143913A - Magnetic head for erasing - Google Patents

Abstract

PURPOSE:To allow the visual checking of a magnetic head for erasing to be mounted on a substrate and to decrease defectives by providing a marking for mounting on either of magnetic core half bodies of the magnetic head for erasing. CONSTITUTION:A magnetic material, such as ferrite, is subjected to grooving to regulate a track width W and grooving for winding. A soft magnetic material is used only for the one ferrite material to form a magnetic thin film 4 and further, a thin film of a nonmagnetic material is formed on the ferrite material in order to provide a magnetic gap 5. The respective magnetic materials are joined by a high-temp. heating treatment using welding glass 6. A surface 7 for sliding with magnetic recording media and a groove 8 for winding are formed and after the marking groove 9 corresponding to the marking for mounting is worked, the block is cut to complete a pair of the magnetic core half bodies. The respective half bodies 2 are mounted to the substrate and the magnetic head for erasing is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an erasing magnetic head in which a magnetic thin film is formed on the track surface of one of the magnetic core halves, and in particular, a pair of magnetic core halves are formed by glass welding. The present invention relates to an erasing magnetic head that is bonded together and provided with attachment markings.

[Conventional technology]

In recent years, recording density has been increased in magnetic recording and reproducing devices such as VTRs (video tape recorders) and DATs (digital audio recorders). So-called metal tapes using this alloy have come into use. Since this type of magnetic recording medium has a high coercive force He, the magnetic core material of the magnetic head used for recording and reproduction needs to have a high saturation magnetic flux density Bs.

However, ferrite materials conventionally used as magnetic core materials have a low saturation magnetic flux density, and permalloy cannot be used because it lacks wear resistance.

Therefore, a so-called metal-in-gap magnetic head is developed, in which a thin film of ferromagnetic metal such as sendust or amorphous is deposited using vacuum thin film formation technology on the abutting surface facing the magnetic gap of a magnetic core made of ferrite or other ferromagnetic oxide. It has been devised and put into practical use.

FIG. 5 is a perspective view showing an erasing magnetic head among conventional metal-in-cap type magnetic heads, and FIG. 6 is a diagram showing the relationship between the erasing magnetic head and the running direction of a magnetic recording medium.

1c and 1d are magnetic core halves, 2 is a pair of magnetic core halves, 3 is a winding window, 4 is a magnetic thin film, 5 is a magnetic gap, 6
7 is a welded glass, 7 is a magnetic recording medium sliding surface, 8 is a winding groove, W is a track width, T is a track surface, and D is a running direction of a magnetic recording medium.

A feature of the erasing magnetic head is that a ferromagnetic thin film 4 such as sendust is formed only on one magnetic core half 1d of a pair of magnetic core halves 2 forming abutting surfaces. The reason for this is to make the magnetic field distribution generated from the magnetic recording medium sliding surface 7 asymmetrical with respect to the magnetic gap 5 .

[Problems to be Solved by the Invention] As mentioned above, the erasing magnetic head makes the distribution of the magnetic field generated around the magnetic gear asymmetric between the left and right sides.
As shown in the figure, the running direction of the magnetic recording medium and the orientation of the magnetic head are determined.

However, since the pair of magnetic core halves are very small, when attaching the pair of magnetic core halves to a board, the orientation of the pair of magnetic core halves cannot be visually confirmed, resulting in a decrease in yield due to poor attachment. was.

The present invention has been made to solve these problems, and provides an erasing magnetic head in which a pair of magnetic core halves on which a magnetic thin film is formed can be visually confirmed when the pair of magnetic core halves are attached to a substrate. It is intended to.

[Means to solve the problem]

The present invention provides a pair of magnetic core halves in which one magnetic core half has a predetermined track width and the other magnetic core half has a predetermined track width and a magnetic thin film formed on the track surface. An erasing magnetic head in which a predetermined magnetic gap is formed between opposing track surfaces, and a mounting marking that allows visual confirmation of the magnetic core halves on which the magnetic thin film is formed is provided on one of the magnetic core halves. The present invention relates to an erasing magnetic head characterized in that it is provided with the above object.

[Effect]

In the present invention, mounting markings are provided on either half of the magnetic core of the erasing magnetic head in which a magnetic thin film is formed on the track surface of one of the magnetic core halves, so that the erasing magnetic head that is attached to the substrate is You can visually check the direction.

〔Example〕

Embodiments of the erasing magnetic head according to the present invention will be described based on the drawings.

FIG. 1 is a perspective view showing one embodiment of an erasing magnetic head according to the present invention, and FIGS. 2(a) and (b).

(c) and (d) are perspective views showing the manufacturing process of the erasing magnetic head according to the present invention, and FIG. Reference numerals indicate the same or corresponding parts, and their explanation will be omitted.

1a and 1b are magnetic core halves each having a half structure made of a magnetic material such as ferrite, 9 is a marking groove corresponding to a marking for attachment, and a magnetic thin film 4 is formed on the track surface T of one magnetic core half 1b. has been done. 10 is a substrate.

The erasing magnetic head according to the present invention is manufactured through the steps shown in FIG. First, a groove e for defining a track width W and a groove f for winding are formed on magnetic materials IA and IB such as ferrite, which are unprocessed raw materials (FIG. 2(a)). Next, a soft magnetic material such as sendust or amorphous is used for only one ferrite material IB, and a magnetic groove of 1g is formed by a vacuum 7Ii film forming method such as vapor deposition or sputtering! A thin film of a non-magnetic material such as 5i02 is formed on the surface of the ferrite material IA to form a magnetic gap 5 (FIG. 2(b)). Further, the tracks formed on the magnetic materials IA and IB are aligned so that they are aligned, and the magnetic material I is
A and IB are joined (Fig. 2 (C)). After that, the magnetic recording medium sliding surface 7 and the winding groove 8 are formed, and the marking groove 9 corresponding to the mounting marking is processed, and then the cutting line
A pair of magnetic core halves 2 are completed by cutting along 1X + and X2 X2 (FIG. 2(d)). Finally, as shown in FIG. 3, a pair of magnetic core halves 2 are attached to the substrate 10 to complete the erasing magnetic head.

In this way, by forming the marking groove 9 in one of the magnetic core halves 1b, it is possible to visually inspect the magnetic core halves 1b on which the magnetic thin film 4 is formed when attaching the pair of magnetic core halves 2 to the substrate 10. Since you can check the installation direction, there is no need to mistake the installation direction.

FIG. 4 is a perspective view showing the manufacturing process of another embodiment of the erasing magnetic head according to the present invention, in which a marking 11 made of paint is applied instead of the marking 9. FIG. If a visually distinguishable color such as a white pen is used for the marking 11, the cost of the erasing magnetic head will not increase because the number of manufacturing steps will not be increased significantly.

〔Effect of the invention〕

As explained above, by providing attachment markings on one of the magnetic core halves of the erasing magnetic head, when attaching a pair of magnetic core halves to a board, it is possible to avoid mistakes in the attachment direction. This has the effect of reducing the number of non-defective products and providing a low-cost erasing magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the erasing magnetic head according to the present invention, and FIG. 2 shows the manufacturing process of the erasing magnetic head according to the present invention, (a) forming a magnetic core half. (b) is an exploded perspective view of a pair of magnetic materials, which are unprocessed raw materials, processed with grooves to define the track width. An exploded perspective view of a thin film of non-magnetic material formed to create a magnetic gap on the surface, (C) is a perspective view of the pair of magnetic materials bonded together using welded glass, (d) is a marking on the bonded pair of magnetic materials. A perspective view showing a pair of magnetic core halves cut out after machining grooves, FIG. 3 is a perspective view showing mounting of the erasing magnetic head according to the present invention on a substrate, and FIG. 4 is a perspective view showing the erasing magnetic head according to the present invention. FIG. 5 is a perspective view showing a conventional erasing magnetic head, and FIG. 6 is a diagram showing the relationship between the same erasing magnetic head and the running direction of the magnetic recording medium. It is. la and lb are magnetic core halves, 2 is a pair of magnetic core halves,
3 is a winding window, 4 is a magnetic thin film, 5 is a magnetic cap, 6 is a welded glass, 7 is a magnetic recording medium sliding surface, 8 is a winding groove,
9 is a marking groove corresponding to the marking for mounting, 10 is the board, 11 is marking paint corresponding to the marking for mounting, W is the track width, T is the track surface, IA, 1B
is a magnetic material, e is a groove that defines the track width, f is a groove for winding, g is a soft magnetic material, and h is a nonmagnetic material. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] Opposing track surfaces of a pair of magnetic core halves in which one magnetic core half has a predetermined track width and the other magnetic core half has a magnetic thin film formed on the track surface and has a predetermined track width. An erasing magnetic head having a predetermined magnetic gap formed therebetween, the magnetic core halves having the magnetic thin film formed thereon having mounting markings that can be visually confirmed;
An erasing magnetic head characterized in that it is provided on one of the magnetic core halves.