JPH01185815A - Magnetic head - Google Patents

Abstract

PURPOSE:To expand the volume of a ferrite core on the windings-side on the out-side in the direction of tape running, and to obtain a monolithic type magnetic head of high saturation magnetic flux density and high recording level by forming a winding groove in a rail-shaped core having larger volume. CONSTITUTION:The winding groove 11 is provided in the rail-shaped core 10 of large volume, and the core on the windings-side to be bonded with this core 10 is made I-shaped, therefore, the I-shaped core also can be made larger in volume. Accordingly, saturation of magnetic flux can hardly occur; since the magnetic flux concentrates in the high Bs metal oxide of the magnetic gap, a high recording magnetic field distribution can be provided for an HDD disk, hence the level of recording comes higher, a recording/reproduced output as well as overwrite characteristic can be improved. Since a metal magnetic material 13 is adhered on the flat side surface of the I-shaped core, its treatment is easy. By making the winding groove side, the winding work also can be made easier, further the number of turns can be increased. As a result, a magnetic head of high input/output level can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a magnetic head for information processing equipment, generally referred to as a wintier type magnetic head, and in particular to a rail-shaped core made of an oxide magnetic material and a magnetic head fixed thereto. It has a core for a winding device,
The present invention relates to a monolithic magnetic head for an HDD (hard disk drive), which is an MIG (metal-in-gap) type in which a metal magnetic material is interposed in the magnetic gap portion.

(Prior Art) This type of computer magnetic head is made of an oxide magnetic material (ferrite) having a rail-shaped slider portion 5 as shown in FIG.
It has a rail-shaped core 1 , and a C-shaped ferrite core 2 fixed to the end of the rail-shaped core, a winding 3 is attached to this C-shaped core 2 , and a core 1 adjacent to the slider section 5 is attached. A magnetic gap 4 is formed at the junction between the two. This magnetic head is supported by a support spring (not shown) using a notch 6 in the back of the rail-shaped core 1, and the slider part is pressed against a disk (not shown) by the pressing force of the spring. The slider section 5 slightly floats above the disk surface due to air resistance due to the high speed rotation of the disk, and records and reproduces data.

In order to correspond to recent high recording density disks, - As shown in Fig. 4, a metallic magnetic material with high saturation magnetic flux density such as permalloy, sendust or amorphous, that is, high Bs, is applied to the surface of the C-shaped core 2 on the magnetic gap side. Some MIG-type magnetic heads are made by depositing by sputtering or other methods.

(Problems to be Solved by the Invention) As mentioned above, in the conventional computer magnetic head, the core 2 on the side where the winding is attached is C-shaped, so only the hollowed out part for attaching the winding is C-shaped. Since the volume of the C-shaped core 2 is small and the depth H of the magnetic gap 4 cannot be made large, the magnetic flux tends to concentrate and become saturated at the tip 2a of the C-shaped core 2, resulting in a low recording level. In the above-mentioned MIG type, the metal magnetic material 7 is attached to the C-shaped core 2 from the magnetic gap forming surface to the hollowed out part of the C-shape, so the adhesion work is troublesome, and the wall thickness of the C-shaped core 2 is Because of this, it is not possible to make a large recess on the side where the winding is installed.
There were other drawbacks.

The present invention solves the above-mentioned drawbacks, and by forming the winding groove on the rail-shaped core having a larger volume, the volume of the ferrite core on the winding mounting side on the mountain side in the disk running direction can be increased. The object of the present invention is to provide a monolithic magnetic head that can achieve high saturation magnetic flux density and high recording level.

(Means for Solving the Problems) The magnetic head of the present invention has a concave winding groove formed at the end of the rail-shaped core made of an oxide magnetic material on the exit side in the disk running direction, and the rail-shaped core is formed with a concave winding groove. The core fixed to the end portion is a shaped core made of an oxide magnetic material, a high Bs metal magnetic material is provided on the joint surface of the shaped core on the magnetic gap side, and the shaped core is made of a high Bs material at the position of the winding groove. It has a shaped core with a winding wire.

(Example) Next, the present invention will be described with reference to the drawings regarding an example.

FIG. 1 is a schematic side view of a winding mounting portion of a magnetic head for a computer according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of the embodiment of FIG. 1.

As explained in the conventional example shown in FIG. 3.4, the slider portion 5 having three rail-like protrusions is formed on the rail-shaped core 10 made of oxide magnetic material facing the disk. A substantially U-shaped winding groove 11 extending horizontally and perpendicularly to the disk running direction is formed at the end 10a on the exit side in the running direction (arrow A direction).

The core 12 fixed to the end portion 10a of the rail-shaped core 10 is similarly made of an oxide magnetic material and is formed into a rough shape. A metal magnetic material 13 made of a high Bs material is fixed to the joint surface on the magnetic gap side (that is, the side facing the rail-shaped core) of this shaped core 12 by means such as sputtering, and the metal magnetic material 13 is A core 12 is fixed to the center of the end 10a of the rail core 10 so as to bridge the U-shaped winding 11. This results in a magnetic gap 4 between both cores 10.12.
is an MlG type gap in which the exit side in the disk running direction is made of a metal magnetic material. In addition, as the metal magnetic material, for example, permalloy, sendust, amorphous ribbon, or the like may be pasted. . The winding 3 is applied to the shaped core 12 using the winding groove 11.

The rail-shaped core 10 also serves as a slider, and has a much larger volume than the shaped core 12 at its end, so even if the winding groove 11 is formed in the rail-shaped core 10, magnetic flux saturation is unlikely to occur. The shaped core 12 can also have a larger volume than the conventional C-shaped core, and the winding groove can also be made larger, making the winding work easier.

(Effects of the Invention) As explained above, according to the present invention, a winding groove is provided on the rail-shaped core having a large volume, and the core on the side where the winding is attached to the core is formed into a shape, so that it is possible to The volume of the shaped core side can also be increased, which prevents saturation of the magnetic flux and concentrates the magnetic flux on the metal oxide made of high Bs material in the magnetic gap.
The recording magnetic field distribution becomes steeper even for discs of 1 to 2, the recording level is high, and the recording/reproducing output and override characteristics are improved. Since the metal magnetic material adheres to the flat side of the shaped core, it is easy to process, and by enlarging the winding groove, the winding work is easy and the number of windings can be increased.
This has many effects, such as the ability to obtain a magnetic head with high input and output.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the winding attachment part of a magnetic head for a computer according to an embodiment of the present invention, FIG. 2 is an enlarged perspective view of the embodiment of FIG. 1, and FIG. 3 is a conventional computer magnetic head. FIG. 4 is a perspective view of a machine magnetic head, and FIG. 4 is a schematic side view of a winding mounting portion of a conventional magnetic head. 3... Winding wire, 4... Magnetic gap, 5... Slider portion, 10... Rail shaped core, 11... Winding groove, 1
2... I-shaped core, 13... Metal magnetic material, A... Disc running direction. Agent Patent Attorney Toshikichi Somekawa 1 Figure 121 type core

Claims (1)

[Claims] A winding groove is formed at the end of the rail-shaped core made of oxide magnetic material on the exit side in the disk running direction, and the I-shaped core made of oxide magnetic material is formed with a metal magnetic material of high Bs material on the joint surface on the magnetic gap side. A magnetic head for a computer, characterized in that a magnetic head is provided and fixed to the end portion of the rail-shaped core, and a winding is attached to the I-shaped core at the position of the winding groove.