JP3005403B2 - Magnetic head - Google Patents

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 for a floppy disk drive.

[0002]

BACKGROUND OF THE INVENTION FIG 2 is a perspective view showing an example slider assembly of the conventional magnetic head, FIG. 3 is an exploded perspective view showing details of the slider assembly of the example of FIG. 2.

As shown in FIGS. 2 and 3 , a conventional magnetic head 10 used in a floppy disk drive has a magnetic core 33 having a gap for recording and reproducing.
a and 33b, non-magnetic sliders 32a and 32b provided in close contact with the magnetic cores 33a and 33b, and magnetic coils 36a and 36b wound around bobbins 35a and 35b mounted on the magnetic cores 33a and 33b, respectively. And a magnetically continuous annular high permeability member 37 is provided around the slider assembly 39.

[0004]

The above-described conventional magnetic head is easily affected by a magnetic field generated by a motor, a solenoid, and the like inside the floppy disk drive, and the floppy disk drive is incompatible with other information devices. When connected and used online, there is a drawback that the device is easily affected by an external magnetic field from a power supply, a display tube or the like, and the electromagnetic shielding effect over a wide frequency band is small.

If the thickness of the annular high magnetic permeability member is increased in order to increase the electromagnetic shielding effect, another problem arises that it becomes an obstacle to downsizing and cost reduction of the magnetic head.

[0006]

According to the present invention, there is provided a magnetic head comprising:
In a magnetic head including a magnetic core having a gap for performing recording and reproduction, a non-magnetic slider provided in close contact with the magnetic core, and a slider assembly having a magnetic coil wound around the magnetic core, different from the high-permeability material around the four sides of the slider assembly of the first high permeability member magnetically continuous annular formed with high magnetic permeability material outside, before Symbol first high permeability material And a ring-shaped high magnetic permeability member having a magnetically continuous annular second high magnetic permeability member formed of a high magnetic permeability material.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings.

[0008]

[0009]

[0010]

[0011]

[0012]

[0013]

[0014] Figure 1 is a view showing the slider assembly of the real施例of the present invention, is a cross-sectional view showing (a) a perspective view showing an appearance, (b) the structure of the annular high permeability material.

[0015] The magnetic head 1 b of the present embodiment, an annular high permeability member 27 provided on the outside of the slider assembly 29, external high enclosing an internal high permeability member 27a, the four sides of the internal high-permeability member 27a It is constituted by the magnetic permeability member 27b. With such a configuration, an external magnetic field from all directions can be cut off in a wide frequency band.

[0016]

As described above, the magnetic head of the present invention has a magnetically continuous annular high magnetic permeability member formed of two kinds of high magnetic permeability materials outside the slider assembly. Thereby, there is an effect that an external magnetic field can be cut off in a wide frequency band.

[Brief description of the drawings]

FIG. 1 is a diagram showing a slider assembly according to an embodiment of the present invention.
(A) is a perspective view showing the appearance, and (b) is an annular high magnetic permeability.
It is sectional drawing which shows the structure of a member .

FIG. 2 is a perspective view showing a slider assembly as an example of a conventional magnetic head .

FIG. 3 is an exploded view showing details of the slider assembly of the example of FIG . 2;
It is a perspective view.

[Explanation of symbols]

 1b / 10 Magnetic head 32a / 32b Slider 33a / 33b Magnetic core 35a / 35b Bobbin 36a / 36b Magnetic coil 29/39 Slider assembly 27/37 Annular high magnetic permeability member 27a Internal high magnetic permeability member 27b External high magnetic permeability member

Claims (1)

(57) [Claims] 1. A slider assembly having a magnetic core having a gap for performing recording and reproduction, a non-magnetic slider provided in close contact with the magnetic core, and a magnetic coil wound around the magnetic core. In the magnetic head provided,
A first magnetically continuous annular high magnetic permeability member formed of a high magnetic permeability material outside the slider assembly, and a material different from the high magnetic permeability material around four sides of the first high magnetic permeability member. A magnetically continuous annular second formed of a high magnetic permeability material
A magnetic head comprising an annular high magnetic permeability member having a high magnetic permeability member.