JPS60113307A - Straddle erasion type magnetic head - Google Patents

Abstract

PURPOSE:To lower a height dimension of the whole magnetic head, to reduce a degree of bending of an erasing magnetic yoke, and to stabilize a magnetic coupling of a magnetic yoke and a magnetic core by laying down and providing the recording and reproducing magnetic yoke and the erasing magnetic yoke on the surface of a slider. CONSTITUTION:A recording and reproducing magnetic core 10 and 11 for forming a magnetic gap, and an erasing magnetic core 14 and 14' provided at a prescribed interval on both sides of the magnetic recording and reproducing magnetic core 10 and 11 are buried in a slider 17 consisting of a nonmagnetic material. As for a recording and reproducing magnetic yoke 12 to which winding has been performed, both its ends are coupled magnetically to the recording and reproducing magnetic core 10 and 11, respectively, and it is laid down and installed so as to be overlapped to the surface of the opposite side of a magnetic recording medium sliding surface of the slider 17. On the other hand, as to an erasing magnetic yoke 15 to which winding has been performed, too, both its ends are coupled magnetically to the erasing magnetic cores 14, 14', respectively, and it is laid down and installed so as to be overlapped to the surface of the opposite side of the magnetic recording medium sliding surface of the slider 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head for recording and reproducing digital signals on a magnetic medium, such as in a floppy disk device.

The magnetic field for the drive of a DVD disc is a tunnel erase type magnetic head in which an erasing head with a magnetic gap in the same direction is arranged on both sides of the recording/reproducing head, and a fixed erase head on both sides of the recording/reproducing head. This is a straddle erase type magnetic head in which the magnetic gap for erasing is the gap between the erasing magnetic pole and the recording/reproducing core, which are arranged at a distance of .

A conventional straddle erase head, as shown in FIG. 1, forms a magnetic gap (described later) between a magnetic core 1 and a magnetic core 2 around which a recording/reproducing coil 4 is wound.
Together with another magnetic core 3, a recording/reproducing head is configured as a closed magnetic path.

Wind the coil 7 for erasing the twist, and attach a bent part 8° 8' to the tip.
The magnetic yoke 6 provided with the magnetic eraser 6 and the erasing magnetic cores 5, 5' embedded in the slider 9 contact each other at bent portions 8.degree. 8' to form a closed magnetic path, thereby forming an erasing head. These magnetic cores are shown in Figure 2 and Figure 3, which shows the cross-sectional view of
As shown in the figure, magnetic cores 1 and 2 forming a magnetic gap 21 for recording and reproducing on the sliding surface of a magnetic medium are held between sliders 9 made of a non-magnetic material. Also, the magnetic pole portion 51 of the magnetic yoke 6 of the erase head embedded in the slider 9
, 51. ' are provided through the sliding surface to form an erasing magnetic gap between the magnetic pole parts 51 and 51' and the recording/reproducing magnetic cores 1 and 2.

However, in the conventional straddle erase type magnetism as described above, as shown in FIG.
Since the magnetic cores 1 and 2 for recording and reproduction stand upright on the opposite side of the sliding surface of the magnetic medium, the total height of the head becomes high, and the upright magnetic core 2 is wound. Coupled with this, there is a drawback that the thin magnetic cores 1 and 2 are easily damaged. In addition, the erasing magnetic yoke 6
However, magnetic cores 1, 2 . and 3, the length of the magnetic path of the magnetic yoke 6 becomes long, which has the drawback of deteriorating efficiency. Furthermore, erasing is performed by passing a direct current.

As the material of the magnetic yoke, a metal such as Nokuumalloy, which has high magnetic permeability in direct current, is generally used, but in the conventional magnetic yoke 6, the joint part with the erasing magnetic core 5° 5' is bent at the bending part 8, It is necessary to bend at 8', which has the disadvantage that the characteristics deteriorate due to this bending, and that the characteristics fluctuate due to variations in the bonding state due to variations in bending accuracy. To provide a thin straddle erase type magnetic head in which the total height of the head is low, a recording/reproducing magnetic core is hard to be damaged, and efficiency is improved by using an erasing magnetic yoke as an erasing magnetic core.

According to the present invention, two erasing magnetic cores are arranged at a predetermined interval on both sides of two recording/reproducing magnetic cores forming a magnetic gear, and these four magnetic cores are A receptacle is embedded and integrally formed in a slider made of a magnetic material, and the winding portions of a magnetic yoke for recording and reproducing and a magnetic yoke for erasing are housed on the surface of the slider opposite to the sliding surface of the magnetic recording medium. The recording/reproducing magnetic yoke and the erasing magnetic yoke are provided with four parts at two locations and are provided with two windings.

Both ends thereof are magnetically coupled to one and the other of the recording and reproducing magnetic cores and one and the other of the erasing magnetic core, respectively, and overlap with the surface of the slider on the opposite side of the magnetic recording medium sliding surface. A magnetic head is obtained which is characterized in that the magnetic head is disposed in a horizontal position.

Embodiments of the present invention will be described in detail below with reference to nine drawings.

Referring to FIG. 4, a slider 17 made of non-magnetic material
includes a recording/reproducing magnetic core 10 that forms a magnetic gap.
and 11. and erasing magnetic cores 14 and 14 arranged at a predetermined interval on both sides of the recording and reproducing magnetic cores 10 and 11.
′ is buried.

These four magnetic cores 10. '11,14. and 14'
The surface opposite to the sliding surface of the magnetic recording medium is the slider 1.
It has been polished to match the 70th surface. Further, the slider 17 is formed with recesses 18 and 19 that are large enough to accommodate the winding 13 of the recording/reproducing magnetic yoke 12 and the winding 16 of the erasing magnetic yoke 15, respectively. The magnetic yoke 12 for recording and reproducing and the magnetic yoke 15 for erasing are formed from a high magnetic permeability metal magnetic material such as -Malloy. Further, the four parts 18 and 19 can be easily obtained by press-molding the slider 17. Therefore, the recording/reproducing magnetic yoke 12 has nine windings.

As shown in the figure, both ends thereof are magnetic cores 1 for recording and reproducing.
0 and 11, and is placed so as to lie on the surface of the slider 17 opposite to the magnetic recording medium sliding surface so as to be gravitational toward it. On the other hand, the erasing magnetic yoke 15 with one winding also has one winding.
Similarly as shown.

Both ends thereof are magnetically coupled to erasing magnetic cores 14 and 14', respectively, and are laid down so as to overlap the surface of the slider 17 on the opposite side of the magnetic recording medium sliding surface. Here 2
The magnetic yoke 12 for recording/reproduction and the magnetic yoke 15 for erasing overlap in some parts, but by curving the magnetic yoke I5 for erasing in that part, the two yokes 1 in the overlapping part are
A material 20 made of a non-magnetic material is inserted between 2 and 15.

The recording/reproducing magnetic yoke 12 and the erasing magnetic yoke 15 are magnetically insulated.

As described above, according to the present invention, since the recording/reproducing magnetic yoke and the erasing magnetic yoke are provided lying on the slider surface, the height of the entire magnetic head can be reduced, and the erasing magnetic yoke can be bent. To easily obtain de to strite erase type magnetism which reduces the degree of deterioration, stabilizes the magnetic coupling between a magnetic yoke and a magnetic core, and improves efficiency by shortening the magnetic path length of an erasing magnetic yoke. There are things that can be done and are very useful for practical purposes.

[Brief explanation of drawings]

Figure 1 shows the conventional straddle erase type magnetism. FIG. 3 is a cross-sectional view taken along line A-A' in FIG. 2, and FIG. FIG. 2 is a perspective view showing the structure of a straddle erase type magnetic head according to a non-embodiment. 10, ]1... Magnetic core for recording/reproduction, 12... Magnetic yoke for recording/reproduction, ]3... Coil for recording/reproduction. 14, ,1. =1'・Magnetic core for erasing, 15・Magnetic yoke for erasing, 16... 1 magnetic coil for erasing, 17・
Slider, 1.8, 1.9... recess.

Claims (1)

[Claims] 1. Two erasing magnetic cores are arranged at a predetermined interval on both sides of two recording/reproducing magnetic cores forming a magnetic gap, and these four magnetic cores are placed in a slider made of non-magnetic material. In a straddle erase type magnetic head having a configuration in which the two erasing magnetic cores are magnetically coupled by an erasing magnetic yoke that is embedded and integrally formed and provided with two windings, the magnetic recording medium of the slider slides. A recessed portion for accommodating the winding portions of the magnetic yoke for erasing and the magnetic yoke for recording and reproducing is formed on the surface opposite to the surface, and the magnetic yoke for recording and reproducing is provided with two windings, and the magnetic yoke for recording and reproducing is provided with two windings. The erasing magnetic yoke is magnetically coupled to the two recording/reproducing magnetic cores and the two erasing magnetic cores, respectively, and overlaps with the surface of the slider opposite to the magnetic recording medium sliding surface. A straddle erase type magnetic head characterized by being laid down in a horizontal position.