JPH0316085Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a core assembly for a magnetic head.

2. Description of the Related Art Conventionally, devices that utilize magnetism have been relatively widely used as external recording media for computers.

Such magnetic recording devices usually use a magnetic head for writing, reading, or erasing data. For example, in a floppy disk device that uses a thin disk-shaped recording medium, the head shown in Fig. 1 is used. A magnetic head as shown is used.

The magnetic head shown in the figure has a core assembly 16 with a core laminate 14 protruding from below a through hole 12 formed approximately at the center of an elastic thin plate 10 formed into a circular shape from thin metal. After inserting the read/write coil 18 and the erase coil 20 from above, the core piece 22 is fixed only to the part of the core laminate 14 where the read/write coil 18 is attached to form a closed magnetic path. ing. The above core laminate 1
4, as shown in FIG.
a and 14b are formed into a substantially E-shape, approximately half of which is made of a high magnetic permeability material such as ferrite, permalloy, or Sendas, and the other half is made of a non-magnetic material such as ceramic, and the magnetic path is open at the upper end. ing.

The core assembly 16 is assembled by supporting the core laminate 14 from both sides by fixing support members 24, 24' made of non-magnetic material.

By the way, the amount of information processed has increased significantly in recent years.
For this reason, there is an extremely strong demand from users for higher density recording devices.

In this case, each of the cores 14a and 14b constituting the core laminate 14 of the magnetic head needs to be made thinner, but the conventional magnetic head described above has the following problems.

In other words, the supporting members 24, 24 that sandwich and hold the core laminate 14 to which a plurality of thin cores 14a, 14b are attached, each of which is attached to the cores 14a, 14.
b, and when assembled into the core assembly 16, the core laminate 14 protrudes upward.

Therefore, when inserting the assembly 16 into the thin elastic plate 10, when attaching the coils 18 and 20, or when fixing the core pieces 22, there is a high possibility that the assembly 16 will be damaged, and high density is not required. There was a problem in that the thinner each core 14a, 14b was made to achieve this, the greater the risk.

As a result, there were drawbacks such as poor workability and increased costs.

This idea was made in view of the above-mentioned problems, and its purpose is to achieve high density recording devices with a relatively simple configuration, as well as to provide a magnetic material with excellent handling properties. A core assembly for a head is provided.

In order to achieve the above object, this invention includes a read/write core and an erase core in the shape of an E-shaped thin plate by bonding a magnetic material and a non-magnetic material. A core assembly for a magnetic head includes a laminate having a pair of erasing cores attached from both sides thereof, and a pair of support members made of a non-magnetic material to hold the laminate tightly, at least one of the support members. is characterized in that its outer shape is formed into an E-shape similar to the core.

Hereinafter, preferred embodiments of this invention will be described with reference to the accompanying drawings.

In the following description, the same reference numerals are used for parts that are the same as or correspond to those in the conventional example described above.

FIG. 3 shows an embodiment of a core assembly for a magnetic head according to this invention.

The assembly 30 shown in the figure will be described with reference to FIG. 1, for example. A core laminate 14 protrudes upward from below a through hole 12 formed approximately at the center of a circular elastic thin plate 10. After inserting the reading/writing coil 18 and the erasing coil 20 from above, the core piece 22 is fixed to the core part to which the reading/writing coil 18 is attached to form a closed magnetic path. Used as a magnetic head in floppy disk devices.

In this case, the core laminate 14 is similar to the conventional one mentioned above.
4a and two erasing cores 14a and 14b are attached using a glass or resin adhesive,
Each of the cores 14a and 14b is formed into a substantially E-shape, and approximately half of the cores are made of a high magnetic permeability material such as ferrite, permalloy, or Sendas, and the remaining half is made of a nonmagnetic material such as ceramic.

The same applies to the point that both sides of the core laminate 14 are sandwiched and held by non-magnetic materials to form a core assembly.

The core assembly 30 shown in the figure has the following features.

That is, the supporting members 32 and 32' fixed to both sides of the core laminate 14 are replaced by one supporting member 3.
2 has substantially the same shape as the conventional support member 24, but the other support member 32' has a substantially E-shaped outer shape with the cores 14a and 14b.

The magnetic head core assembly 30 to which such a support member 32' is fixed has a support member 3 having substantially the same shape on the side surface of the core stack 14 that projects upward.
2', this part can be mechanically reinforced. Therefore, even if the cores 14a and 14b are made thinner with the intention of increasing the recording density, the core portions may be damaged when attaching the core assembly 30 to the elastic thin plate 10 or when attaching the coils 18 and 20. The risk of damage can be effectively prevented.

Further, since the mechanical strength is reinforced, the work of installing the coils 18 and 20 can be performed relatively roughly, and workability can be improved.

FIG. 4 shows another embodiment of the magnetic head core assembly according to this invention, and only its features will be explained below.

In the assembly shown in the figure, the support member 32' is formed into a substantially E-shape, and the two E-shaped tips of the portion to which the core piece 22 is fixed are cut off by a length corresponding to the width of the core piece 22. ing.

By adopting such a shape, the above-mentioned effects can be achieved, and the supporting member 3
The E-shaped tip 2' functions as a positioner when fixing the core piece 22, and it becomes possible to stably fix the core piece 22 to the side surface of the read/write core 14a.

In addition, since the core laminate 14 has the cores 14a and 14b bonded to each other with an adhesive 34, if this oozes out to the upper side and rides on this part when fixing the core piece 22 and becomes stuck, the characteristics of the magnetic head may be affected. However, in this embodiment, there is a space 36 between the support member 32' and the read/write core 14a.
is formed, so even if the amount of seepage is the same, it adheres to both sides of the space 36 and the rising position becomes lower, thereby solving the above problem.

In addition, in the above embodiment, one support member 32'
The case where the cores 14a and 14b have substantially the same shape is shown;
Of course, it is also possible to have the same shape as b.

As explained in the embodiments above, the core assembly for a magnetic head according to the present invention has a structure in which one of the support members supporting the core stack from both sides has substantially the same shape as the core, thereby increasing the recording density. A core assembly for a magnetic head that can accommodate higher density can be provided economically.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a conventional magnetic head, FIG. 2 is an exploded perspective view of a conventional magnetic head core assembly, and FIG. 3a is a magnetic head core assembly according to an embodiment of the present invention. It is a perspective view, and the same figure b is the exploded view. FIG. 4 shows another embodiment of this invention, in which FIG. 4A is a perspective view and FIG. 4B is a sectional view of a main part. 10...Elastic thin plate, 12...Through hole, 14...Core laminate, 16...Core assembly, 18...Reading/writing coil, 20...Erasing coil, 2
2...Core piece, 28...Core assembly, 32,3
2'...Supporting member.

Claims (1)

[Scope of utility model registration request] A magnetic material and a non-magnetic material are bonded to each other, and a thin flat plate-like reading/writing core and an erasing core are formed in an E shape, and a pair of erasing cores are pasted from both sides of the reading/writing core. In a core assembly for a magnetic head, in which a laminate and a pair of supporting members made of a non-magnetic material hold the laminate closely together, at least one of the supporting members has an external shape similar to that of the core. A core assembly for a magnetic head characterized by being formed into a letter shape.