JPH0351767Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a magnetic head for erasing.

(Prior Art) Conventionally, a configuration as shown in FIG. 5, for example, is known as an erasing magnetic head. In the figure, reference numeral 1 indicates a core, a gap is formed by a spacer 2, and a semi-double gap is constructed by sandwiching a magnetic material 3 between non-magnetic materials 4 in a sandwich-like configuration.

To form this semi-double gap, as shown in the figure, the non-magnetic material 4 is folded in half with the magnetic material 3 inside, and adhesive is filled between the gap and the core 1 to secure it. There are also known methods in which a spacer element formed by depositing a non-magnetic material layer on the surface of a magnetic material is fixed via an adhesive.

(Problems that the invention aims to solve) However, in these conventional methods, since the number of parts is large, 2 or 3, the thickness accuracy errors of each part are accumulated, making it difficult to obtain gap accuracy. The assembly process is complicated due to the large number of parts, and in order to allow for the thickness accuracy error mentioned above, the position of the magnetic material within the gap provided in the core 1 is made in advance to allow some space between the gaps. In the case of vapor deposition, the adhesion of the non-magnetic material is weak and may peel off during assembly, and it is not suitable for mass production, leading to increased costs.

(Means for Solving the Problems) Therefore, an object of the present invention is to provide an erasing magnetic head that can solve the above problems.

In order to achieve the above object, the present invention has constructed a magnetic head for erasing by integrally forming a spacer and a magnetic material, and filling a spacer element made of one part between the gaps of the core. The points are distinctive.

The present invention will be explained in detail below based on one embodiment of the present invention.

The member designated by reference numeral 5 in FIG. 2 is a spacer element made of a metal composite material, and is integrally constructed by laminating non-magnetic metal plates 7 and 8 on both sides of a magnetic metal plate 6, respectively.

This spacer element 5 is manufactured by press punching a rolled plate made of a metal composite material manufactured by a cladding method. Therefore, the thickness of the non-magnetic metal plates 7 and 8 regulating the gap and the overall thickness including the magnetic metal plate 6 are highly accurate, and moreover, they are formed as an integral part. As shown in FIG.
The semi-double gap is constructed by being installed between gaps of a predetermined size provided at the gap.

In this case, since the thickness dimension accuracy of the spacer element 5 is high, even when it is installed between the cores 10 and fixed with adhesive, the thickness of the adhesive layer is kept to the minimum necessary to improve the gap accuracy. I can do it.

Furthermore, since it is formed as a single component, it is easy to assemble, and since the connections between the members are strong, the non-magnetic metal plate will not come off during assembly.

Further, heat treatment can also be performed after press punching to ensure strong bonding with the non-magnetic metal plate.

According to the Clad method, gaps made of non-magnetic metal plates are not limited to the double structure shown in Figure 1 above, but can also be
For Hc (coercive force) tape, there is a 3-gap type which is advantageous in terms of erasing rate, or a single gap provided in the core 18 as shown in Fig. 3.
1, 12, 13 as non-magnetic metal plates 14, 15, 1
It is also possible to adopt a four-gap configuration in which a spacer element sandwiched between 6, 17, etc. is installed. The example in Figure 4 is for two gaps provided in the core 19.
This is an example in which two double gaps are provided by installing spacer elements according to FIG. 2 between them.

In this way, even if the number of gaps is increased, the overall shape of the spacer element remains unchanged except for the plate thickness, and it is possible to create a large number of gaps using the same process and construction method.
Furthermore, the gap accuracy can be improved by using one spacer element compared to the conventional case of two or three parts.

(Function) The metal composite material that is the spacer element according to the present invention can be mass-produced by punching out a large material by press processing, and since the bond between the magnetic metal plate and the non-magnetic metal plate is strong, heat treatment is also possible. It is possible to form multiple gaps with one spacer element without the outer non-magnetic metal plate rubbing off during the assembly process.

(Effects of the invention) In this way, it is suitable for mass production, which reduces costs, and since it is an integral part with strong connections between parts, it is easy to assemble, and it is convenient to form a gap with high precision. .

[Brief explanation of the drawing]

1, 3, and 4 are front views of essential parts of an erasing magnetic head illustrating an embodiment of the present invention, respectively;
FIG. 2 is a front view of a spacer element, and FIG. 5 is a front view of a main part of an erasing magnetic head according to the prior art. 5... Spacer element, 6, 11, 12,
13...Magnetic metal plate, 7, 8, 14, 15, 1
6,17...Nonmagnetic metal plate.

Claims (1)

[Scope of utility model registration request] 1. A magnetic head for erasing, characterized in that a gap is interposed with a spacer element made of a metal composite plate in which non-magnetic metal plates are closely laminated by cladding on both sides of at least a magnetic metal plate serving as a center core.