JPH07110916A - Magnetic head - Google Patents

Abstract

PURPOSE:To achieve the reduction in thickness and size or hither recording/ reproducing performance of a magnetic head by allowing the lowering of the height of a coil. CONSTITUTION:In a magnetic head 10, a magnetic circuit is made up of core pieces 14 and 16 which are arranged to face each other through a gap 12 for recording and reproduction while comprising a magnetic body, coils 18 and 20 applied on the core pieces 14 and 16 respectively and a back bar 22 which is adapted to link the core pieces 14 and 16 while comprising a magnetic body. Windings 18a and 20a of the coils 18 and 20 are wound on the core pieces 14 and 16 so as to generate magnetic fluxes phi1 and phi2 in the same direction within the magnetic circuit with respect to the core pieces 14 and 16 when current flows through the coils 18 and 20. The coils 18 and 20 are connected in parallel electrically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly to a magnetic head used in a floppy disk device or the like.

[0002]

2. Description of the Related Art FIG. 2 is a perspective view showing a conventional magnetic head. Hereinafter, description will be given with reference to this drawing.

The magnetic head 50 is arranged opposite to each other with a recording / reproducing gap 52 interposed therebetween, and core pieces 54 and 56 made of a magnetic material, and a coil 58 mounted on the core piece 54.
And a back bar 60 made of a magnetic material and connecting the core piece 54 and the core piece 56.

Next, the operation will be described. At the time of recording,
A desired current is applied to the winding 58a of the coil 58, and the core 58
To generate a magnetic flux. As a result, a magnetic circuit is formed on the core pieces 54, 56 and the back bar 60 via the magnetic recording medium (not shown), and recording is performed on the magnetic recording medium. During reproduction, the core pieces 54 and 56 pick up the leakage of magnetism from the rotating magnetic recording medium. As a result, a reproducing current is obtained from the winding 58a of the coil 58, which forms a magnetic circuit in the core pieces 54 and 56 and the back bar 60 via the magnetic recording medium. A magnetic head of this type is described in, for example, Japanese Utility Model Laid-Open No. 63-173705.

[0005]

However, the conventional magnetic head 50 has the following problems.

It is difficult to further reduce the height h ₄ of the coil 58. Therefore, there is a limit in reducing the height or the size of the magnetic head 50 by reducing the height h ₃ of the magnetic head 50.

The shorter the magnetic path length of the magnetic head 50, the smaller the leakage magnetic flux, so that the recording / reproducing performance can be improved.
However, it is difficult to further reduce the height h ₄ of the coil 58. Therefore, there is a limit to shortening the magnetic path length by reducing the height h ₃ of the magnetic head 50.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make it possible to reduce the height of the coil, thereby making the magnetic head thinner, smaller, and improving the recording / reproducing performance.

[0009]

A magnetic head according to the present invention has been made to achieve the above-mentioned object, and is arranged to face each other through a recording / reproducing gap and is made of a magnetic material. A second core piece, first and second coils mounted on each of the core pieces, a back made of a magnetic material and connecting the first core piece and the second core piece. A magnetic circuit is formed from the bar. Then, when a current is applied to the first and second coils, magnetic fluxes in the same direction are generated in the first and second core pieces in the magnetic circuit, respectively. The winding of the second coil is wound around the first and second core pieces. Also,
The first coil and the second coil may be electrically connected in parallel or in series.

[0010]

[Operation] During recording, a desired current is applied to the first and second
To the coil. Then, magnetic fluxes in the same direction are generated in the first and second core pieces in the magnetic circuit. Then, recording is performed from the gap to the magnetic recording medium. During reproduction, magnetic leakage from the rotating magnetic recording medium is picked up from the gap, so that magnetic fluxes in the same direction are generated in the first and second core pieces in the magnetic circuit. As a result, the reproduction current flows in the same direction in the first and second coils.

[0011]

1 is a perspective view showing an embodiment of a magnetic head according to the present invention. Hereinafter, description will be given with reference to this drawing.

A magnetic head 10 according to the present invention includes core pieces 14 and 16 made of a magnetic material and facing each other through a recording / reproducing gap 12, and coils mounted on the core pieces 14 and 16, respectively. A magnetic circuit is formed by 18, 20 and a back bar 22 that connects the core piece 14 and the core piece 16 and is made of a magnetic material. And
When a current is applied to the coils 18 and 20, the core pieces 14 and
Windings 18 a and 20 a of coils 18 and 20 are wound around core pieces 14 and 16 so that magnetic fluxes φ ₁ and φ _{2 in the} same direction are generated in the magnetic circuit 16.
The coil 18 and the coil 20 are electrically connected in parallel.

Next, the operation of the magnetic head 10 will be described. During recording, a desired current is applied to the coils 18, 2
Flow to 0. Then, magnetic fluxes φ ₁ and φ ₂ in the same direction are generated in the core pieces 14 and 16 in the magnetic circuit, respectively. Then, recording is performed from the gap 12 to the magnetic recording medium (not shown). At the time of reproduction, magnetic flux leaking from the rotating magnetic recording medium is picked up from the gap 12 to generate magnetic fluxes φ ₁ and φ ₂ in the same direction in the core pieces 14 and 16 in the magnetic circuit. As a result, reproducing currents in the same direction flow through the coils 18 and 20.

For example, during recording or reproduction, magnetic fluxes φ ₀ , φ ₁ , φ ₂ , and φ ₃ are generated in the gap 12, core pieces 14 and 16, and back bar 22, respectively, as shown in the figure.

As described above, since one coil is divided into two, the height h ₂ of the coils 18, 20 is about half that of the conventional one. Along with this, the height h ₁ of the magnetic head 10 is also considerably lower than in the conventional case. Further, since the height h ₁ of the magnetic head 10 is reduced, the magnetic path length is shortened and the leakage magnetic flux is reduced.

Although the coils 18 and 20 are connected in parallel in this embodiment, the coils 18 and 20 may be connected in series by appropriately rearranging the windings 18a and 20a.

[0017]

According to the magnetic head of the present invention, each of the two core pieces is covered with a coil,
The height of the coil can be halved from the conventional one. As a result, the height of the magnetic head can be reduced, and the magnetic head can be thinned or downsized. Further, since the magnetic path length can be shortened by reducing the height of the magnetic head, the leakage magnetic flux can be reduced and the recording / reproducing performance can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 magnetic head 12 gap 14 1st core piece 16 2nd core piece 18 1st coil 18a 1st coil winding 20 2nd coil 20a 2nd coil winding 22 Back bar

Claims (3)

[Claims] 1. A first core piece and a second core piece made of a magnetic material, which are arranged to face each other with a recording / reproducing gap therebetween, and
A magnetic circuit is formed from first and second coils respectively mounted on these core pieces, and a back bar made of a magnetic material and connecting the first core piece and the second core piece. The first and second core pieces are configured to generate magnetic fluxes in the same direction in the magnetic circuit when current is applied to the first and second coils, respectively. A magnetic head, wherein a winding of a second coil is wound around the first and second core pieces. 2. The magnetic head according to claim 1, wherein the first coil and the second coil are electrically connected in parallel. 3. The magnetic head according to claim 1, wherein the first coil and the second coil are electrically connected in series.