JPH0594602A - Joining type magnetic head - Google Patents

Abstract

PURPOSE:To improve the performance, productivity and economy of the joining type magnetic head. CONSTITUTION:This joining type magnetic head 30 is constituted by butting one core half body 31a formed by joining a front gap core part 31a-1 consisting of a ferrite single crystal and a back core part 31a-2 consisting of a ferrite polycrystal and another magnetic core half body 31b consisting of only the ferrite single crystal against each other via a magnetic gap 13 to constitute a magnetic circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a junction type magnetic head used in a VTR.

[0002]

2. Description of the Related Art Conventionally, a magnetic head constituted by using ferrite as a magnetic material has been known. As is well known, this magnetic head generally constitutes a magnetic circuit by abutting a pair of magnetic core halves made of ferrite, while providing magnetic gaps at predetermined intervals in the direction crossing the magnetic path, With this magnetic gap, predetermined recording and reproduction are performed on a magnetic recording medium such as a magnetic tape that slides on the tape sliding surface.

FIG. 3 is a plan view showing an example of a conventional magnetic head 10.

In the figure, 11a and 11b are magnetic core halves, 12 is a winding window, and 13 is a magnetic gap.

In the magnetic head 10, a pair of magnetic core halves 11a and 11b made of a ferrite single crystal are butted against each other via a magnetic gap 13, and a winding window 12 for winding a coil is formed therebetween. ing. And a pair of magnetic core halves 1 consisting of this ferrite single crystal only
An annular magnetic circuit is constituted by 1a and 11b, and a magnetic gap 13 performs recording and reproduction on a magnetic tape or the like.

FIG. 4 is a plan view showing an example of a conventional junction type magnetic head 20, 21a and 21b are magnetic core halves, 21a-1 and 21b-1 are front gap core portions, and 21a-2 and 21b. -2 is a back core part.

In the junction type magnetic head 20, the magnetic core halves 21a and 21b, which form a magnetic circuit by abutting each other through the magnetic gap 13, form front magnetic path portions on both sides sandwiching the magnetic gap 13. Gap core portions 21a-1 and 21b-1 and back core portions 21a-2 and 21b- whose both sides are joined to each other to form a rear magnetic path portion.
2 and.

Both of the magnetic core halves 21a and 21b are composed of a junction type of a ferrite single crystal and a ferrite polycrystal, and the front gap core portions 21a-1 and 21b-1 of the magnetic core halves 21a and 21 are provided with ferrite. A single crystal is used, and a ferrite polycrystal is used for the back core portions 21a-2 and 21b-2.
a-1 and 21b-1 and back core portions 21a-2 and 21b
-2 is joined to form a joint type.

[0009]

However, the magnetic head 10 shown in FIG. 3 has the pair of core halves 1 as described above.
Each of 1a and 11b is composed of only a ferrite single crystal, but this ferrite single crystal is extremely expensive, and the shape of the core halves 11a and 11b forming the magnetic head 10 is not large. If so, a ferrite single crystal having such a large size is required, which is a cost problem.

Further, the pair of core halves 21a and 21b constituting the magnetic head 20 shown in FIG. 4 is a junction type of a ferrite single crystal and a ferrite polycrystal, and in the manufacturing process, the ferrite single crystal and the ferrite polycrystal are joined. There is a problem that a crystal bonding process is required and mass production is difficult.

[0011]

The present invention has been made in order to solve the above-mentioned problems, and a front gap core portion made of a ferrite single crystal and a back core portion made of a ferrite polycrystal are joined together. An object of the present invention is to provide a junction type magnetic head in which one of the core half bodies and the other core half body made of only ferrite single crystal are butted against each other via a magnetic gap to form a magnetic circuit.

[0012]

1 is a plan view showing an example of a junction type magnetic head 30 of the present invention.

In the figure, 31a and 31b are magnetic core halves, 31a-1 is a front gap core portion, and 31a-.
2 is a back core part, 12 is a winding window, and 13 is a magnetic gap.

The points different from the above-described conventional magnetic heads 10 and 20 will be mainly described with reference to FIG.

In the junction type magnetic head 30 of the present invention, one magnetic core half body 31a which is abutted via the magnetic gap 13 to form a magnetic circuit is of a junction type of ferrite single crystal and ferrite polycrystal, and the other one. The magnetic core half body 31b is composed of only a ferrite single crystal.

Further, the ferrite single crystal of the magnetic core half body 31a is located in the front gap core portion 31a-1, and the ferrite polycrystal is in the back core portion 31a-.
2 is located.

FIG. 2 is a plan view showing another example of the junction type magnetic head 40 of the present invention. 41a and 41b are magnetic core halves, 41a-1 is a front gap core portion, and 4a.
1a-2 is a back core part.

This figure is generally called a DA head, and one magnetic core half body 41a which is abutted via the magnetic gap 13 to form a magnetic circuit is composed of a ferrite single crystal and a ferrite polycrystal. It is of a junction type, and the other magnetic core half body 41b is made of a ferrite single crystal only. As shown in the figure, the magnetic core half 4
Only the shapes of 1a and 41b are different from the junction type magnetic head 30 shown in FIG.

These junction type magnetic heads 30, according to the present invention,
40 is a junction type of ferrite single crystal and ferrite polycrystal used only for one magnetic core half, and the strength of the joint part of ferrite single crystal and ferrite polycrystal is reinforced by the other ferrite single crystal. Processing and
The assembling process is also simplified, and the economy and productivity are excellent.

In FIG. 1 and FIG. 2, a magnetic core half body 31 having a winding window 12 formed therein, which is generally called a C core, is formed.
Although a and 41a are illustrated by using a junction type ferrite of ferrite single crystal and ferrite polycrystal, the present invention is not limited to these examples, and an embodiment of the other magnetic core half body Is also included.

[0021]

As described above, one core half formed by joining the front gap core portion made of ferrite single crystal and the back core portion made of ferrite polycrystal,
The other magnetic core half body consisting of only a ferrite single crystal is made into a junction type magnetic head in which a magnetic circuit is formed by abutting each other through a magnetic gap, so that the junction type of the ferrite single crystal and the ferrite polycrystal is Since it is used only for the magnetic core half body, the strength of the joint between the ferrite single crystal and the ferrite polycrystal is enhanced by being reinforced by the other ferrite single crystal, and the processing and assembly process is simplified, resulting in economic efficiency and production. A junction type magnetic head having excellent properties is provided.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a junction type magnetic head of the present invention.

FIG. 2 is a plan view showing another example of the junction type magnetic head of the present invention.

FIG. 3 is a plan view showing an example of a conventional magnetic head.

FIG. 4 is a plan view showing an example of a conventional junction type magnetic head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Conventional magnetic head 20 Conventional junction type magnetic head 30 1st Example of the junction type magnetic head of this invention 40 2nd Example of the junction type magnetic head of this invention 12 Winding window 13 Magnetic gap 31a, 31b, 41a , 41b Magnetic core half body 31a-1, 41a-1 Front gap core part 31a-2, 41a-2 Back core part

Claims (1)

[Claims] 1. A magnetic core half body 31a formed by joining a front gap core portion 31a-1 made of a ferrite single crystal and a back core portion 31-2 made of a ferrite polycrystal, and a ferrite single crystal only. The other magnetic core half 31b is formed into a magnetic circuit by abutting the other magnetic core half 31b via the magnetic gap 13.