JPH0239011B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and more particularly to a magnetic head having a structure in which two head halves, each consisting of a core half made of a high magnetic permeability material, a shielding half half, etc., are butted against each other. be.

A conventional magnetic head of this type consisting of a pair of left and right head halves has a structure as shown in FIG.

In FIG. 1, reference numerals 1 and 2 indicate core halves, each of which is fixed to a support member 3.
Furthermore, coils 4 and 5 for applying a magnetic field are attached to the core halves 1 and 2. A current is supplied to these coils 4 and 5 via terminals 6 and 7 which are provided protruding from one end of the support member 3.

A blocking plate 8 is provided between the core halves 1 and 2. In this way, the head halves 10, 10, to which the core halves 1, 2, the blocking plates 8, and the coils 4, 5 are respectively attached, are butted against each other via the spacer 9 and fixed.

Conventionally, in order to butt and integrate the two head halves 10, 10, for example, as shown in FIGS. It was fixed by welding as shown in the figure.

On the other hand, the supporting members 3, 3 are usually made of materials that are difficult to weld, such as Zn die-cast, nickel silver, brass, aluminum, plastic mold, or ceramic, and there is a problem of insufficient welding strength. As a result, when trying to commercialize a product, it was difficult to commercialize the product because it was damaged during processing, leading to a decline in recording and playback characteristics, and variations in characteristics were large.

In addition, when selecting materials that are easy to weld,
This was a difficult situation in terms of the shape, precision, and function of the support member. Furthermore, as shown in Figure 2B,
The tape sliding surface side of the head halves 10, 10 is subjected to finishing grinding as shown by the symbol X.
After many years of use, a vertical positional shift occurs between the left and right core halves 1, 1 and 2, 2 as shown in Figure 2B, resulting in poor magnetic tape contact.
It had drawbacks such as poor recording and playback characteristics.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional magnetic head.It is an object of the present invention to provide a magnetic head that has strong welding strength and is constructed so that the component parts do not shift or deform due to aging. It is an object.

In order to achieve the above object, in the present invention, a plurality of core halves made of a high magnetic permeability material and a shielding plate half body disposed between the plurality of core halves are supported by a supporting member. In the magnetic head in which a pair of head halves made of a high magnetic permeability material are abutted and integrated, at least one part of the abutted portion where the shield plate halves made of a high magnetic permeability material are abutted is fixed by beam welding. .

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIGS. 3A to 3C illustrate one embodiment of the present invention. In each figure, the same parts as in FIGS. 1 and 2 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, as shown in FIG. 3B,
Welded parts A and B were formed by beam welding using a laser beam or an electron beam, separated by a predetermined distance, on the abutting surfaces of the shield plate halves 8, 8, which are one of the abutting surfaces of the head halves 10, 10. Since the shielding plate halves 8, 8 are made of a highly permeable material such as permalloy or sendust, beam welding allows them to be securely fixed, and will not shift or deform even over time. never occurs.

4A to 4C illustrate another embodiment of the present invention, and in this embodiment, the shielding plate halves 8, 8
The tip and rear ends of the tape are welded by beam welding A and B, and the tape is placed in a shield case so as not to leave welding marks on the sliding surface, fixed with resin, etc., and then ground. Perform finishing and remove welding marks. Even if such a welded structure is adopted, exactly the same effect as the embodiment shown in FIG. 3 can be obtained.

5A to 5C illustrate another embodiment of the present invention, and in this embodiment, beam welding A, B
This is done on the abutting surfaces of the core halves 1 and 2 made of a high magnetic permeability material such as permalloy sendust. Beam welding C and D are also performed on the abutting surfaces of the lower end sides of the core halves 1 and 2.

FIG. 6 explains still another embodiment of the present invention. In this embodiment, beam welding A and B are performed on the abutting surfaces of the core halves 1 and 2 on the tape sliding surface side. , Beam welding C is performed on the blocking plate halves 8, 8 on the opposite side.

Even if the welded structure shown in FIGS. 5 and 6 is adopted, the same effect as the embodiment shown in FIG. 3 can be obtained.

As is clear from the above description, according to the present invention, the abutting portions of the halves of the shielding plates made of high magnetic permeability material placed between the channels of the multi-channel magnetic head are directly beam welded, so no special members are required. Beam welding can be performed without the need for a magnetic head, and an inexpensive magnetic head can be constructed. In addition, since the shielding plate halves are made of a material with high magnetic permeability, weldability is good and welding strength is improved, and high welding strength can be obtained despite the small number of welding points. Furthermore, since the abutting portions of the barrier plate halves between the channels are welded, the number of welding locations can be reduced compared to, for example, welding the abutting portions of the outermost core halves. In this way, beam welding can be performed without the need for special parts, and the number of welding points can be reduced, while high welding strength can be obtained, making it possible to obtain an inexpensive, high-quality magnetic head with excellent recording and playback characteristics. .

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a magnetic head to which the present invention is applied, FIGS. 2A-C are a plan view, side view, and bottom view illustrating a conventional magnetic head, and FIGS. 3A-3
C to FIG. 6A to C are a plan view, a side view, and a bottom view, respectively, illustrating different embodiments of the present invention. 1, 2... Core half, 3... Support member, 4, 5
... Coil, 6, 7 ... Terminal, 8 ... Breaking plate half, 9 ... Spacer, 10 ... Head half.

Claims (1)

[Claims] 1 A pair of head halves each formed by supporting a plurality of core halves made of a high magnetic permeability material and a shielding plate half body disposed between the plurality of core halves with a supporting member are brought together and integrated. 1. A magnetic head, characterized in that at least one portion of the abutted portion of the shield plate halves made of a high magnetic permeability material is welded and fixed by beam welding.