JPH056610A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the erroneous operation caused by an external magnetic field by providing a magnetic shield on the bottom surface side of a case which is also used as a slider in addition to a magnetic shield at the four side surfaces of the case which is also used as the slider. CONSTITUTION:A shielding annular magnetic material 4 is arranged on four side surfaces of a case 1 which is also used as a slider. In addition, a shielding plate-shaped magnetic material 6 is provided at least between two rails 3A and 3B at the bottom surface side of the case 1 which is also used as the slider.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head usable as a floppy head for a floppy disk device used as an external storage device of an electronic computer.

[0002]

2. Description of the Related Art Conventionally, in a floppy head or the like, there is known a structure in which a head main body having a winding on a head core is provided on a slider / combined case made of ceramic or the like facing a magnetic recording medium such as a floppy disk. FIG. 2 shows a conventional magnetic head of this type. In FIG. 1, reference numeral 1 denotes a slider / case (non-magnetic material) such as ceramics. In the slider / case 1, a head main body having a winding around a head core 2 is arranged. The slider-use case 1 is composed of two rails (sliding contact portions) protruding from the bottom surface facing a magnetic recording medium such as a floppy disk.
3A and 3B are provided, and the tip of the head core 2 having the recording / reproducing gap Gr and the erasing gaps Ge on both sides thereof is formed on one rail 3A is exposed. And
An annular magnetic material 4 for shielding such as ferrite is fixed to the four side faces of the slider / case 1. Reference numeral 5 is a gimbal to which such a magnetic head is attached.

In the conventional example shown in FIG. 2, the slider-use case 1 is used.
An annular magnetic material 4 such as ferrite is provided on the four side surfaces of the magnetic head to improve the S / N (signal to noise ratio) of the magnetic head due to its magnetic shield effect.

[0004]

By the way, recently, the miniaturization of electronic computers has progressed more and more, and the interval between the magnetic head in the floppy disk device and the display CRT of the electronic computer is 10.
The situation is becoming less than cm. With the magnetic shield of the annular magnetic material 4 alone as shown in FIG. 2, there has been a problem that a magnetic field generated by the CRT causes a read / write error in the magnetic head.

In view of the above points, the present invention prevents the adverse effect of an external magnetic field such as a CRT by arranging a magnetic material for a magnetic shield between two rails of a case that also serves as a slider, and improves the operation reliability. It is an object of the present invention to provide a magnetic head having an improved magnetic field.

[0006]

In order to achieve the above object, the present invention provides a magnetic head in which a head core is arranged on one rail of a slider / case having two rails facing a magnetic recording medium. Either the first magnetic material is provided so as to surround the four sides of the slider / combined case in a ring shape, and the second magnetic material is arranged on the slider bottom surface between the two rails, or the slider / combined case is used. The four side surfaces are annularly surrounded and a magnetic material is arranged so as to cover at least the slider bottom surface between the two rails.

[0007]

In the magnetic head of the present invention, the four sides of the slider / case is shielded by magnetic material, and the magnetic material is arranged between the two rails so that the slider / case bottom is also magnetically shielded. , The adverse effect of the external magnetic field can be sufficiently prevented even when it is placed close to the CRT, and errors during recording and reproduction can be eliminated. In addition, a flat plate-shaped magnetic material such as ferrite may be placed between the two rails, or a magnetic material integrated with the magnetic material on the four sides
The structure is simple, as it only needs to cover between the rails of the book.

[0008]

Embodiments of the magnetic head according to the present invention will be described below with reference to the drawings.

In FIG. 1, a first shield annular magnetic material 4 is arranged and fixed to the four side surfaces of a slider / case (non-magnetic) 1 made of ceramic or the like, and protrudes from the bottom surface of the slider / case 1 as well. 2 rails 3A, 3
A plate-like magnetic material 6 for shielding such as ferrite is also fixed between B with an adhesive or the like. The other structure is the same as that of the conventional example shown in FIG.

Now, as the material of the plate-like magnetic material 6, MnZn type ferrite having an effective magnetic permeability of 4500 at 1 MHz is adopted, and its thickness T is 0.3 mm, width W is 0.6 mm and length L. When the value is 4 mm, the value is 0 along the running direction of the magnetic recording medium.
The induced voltage picked up by the head in 1 Oe equal magnetic field is -53.5.
It becomes dBV and is -4 of the conventional example of FIG. 2 without the plate-shaped magnetic material 6.
It has been found that it is considerably improved as compared with 7.5 dBV, and thereby malfunctions due to an external magnetic field such as a CRT can be prevented.

In the above embodiment, ferrite is used as an example of the magnetic material 4 and 6 for shielding, but other magnetic materials can be used.

FIG. 3 shows another embodiment of the present invention. In this case, magnetic shielding is performed using a shield case 11 such as a permalloy that covers the four side surfaces of the slider / case (non-magnetic) 1 made of ceramics and the bottom surface of the case 1 other than the two rails 3A and 3B. . Here, shield case 1
1 is a hole 12 for projecting the two rails 3A, 3B
And is fitted on the outside of the slider / case 1, and is fixed with an adhesive or the like. Other configurations are similar to those of the conventional example shown in FIG.

[0013]

As described above, according to the present invention,
Prevents malfunction due to external magnetic field by surrounding the four sides of the slider combined case with a magnetic material in an annular shape and by arranging the magnetic material between the two rails of the slider combined case to improve the shield on the slider bottom side. can do. For example, even when the magnetic head is placed close to the CRT of the electronic computer, it is possible to prevent malfunction due to the magnetic field generated by the CRT.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a magnetic head according to the present invention.

FIG. 2 is a perspective view showing a conventional magnetic head.

FIG. 3 is a perspective view showing another embodiment of the magnetic head according to the present invention.

[Explanation of symbols]

1 Slider case 2 head core 3A, 3B rail 4 annular magnetic material 6 Plate-shaped magnetic material 11 shield case

Claims (2)

[Claims] 1. A magnetic head in which a head core is arranged on one rail of a slider / combined case having two rails facing a magnetic recording medium, and a first magnetic material is formed so as to surround four sides of the slider / combined case in an annular shape. And a second magnetic material is disposed on the bottom surface of the slider between the two rails. 2. A magnetic head in which a head core is arranged on one rail of a slider / combined case having two rails facing a magnetic recording medium, the four side surfaces of the slider / combined case being annularly surrounded, and at least the two A magnetic head characterized in that a magnetic material is arranged so as to cover the slider bottom surface between rails.