JPH0227381Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic head used in a digital magnetic recording device such as a floppy disk device, and provides a magnetic head that is easy to assemble and has less variation in characteristics. be.

As is well known, a magnetic head for a floppy disk drive is a tunnel erase type magnetic head, which has a structure in which an erasing head is placed on both sides of a recording/reproducing head and has a magnetic gap in the same direction as the magnetic gap of the recording/reproducing head. , a straddle erase type magnetic head in which the magnetic poles of the erase head core are arranged on both sides of the recording/reproducing head with a certain gap between them, and erasing is performed by the leakage magnetic field from the gap between the magnetic poles and the recording/reproducing head core. There is. In the case of any head, by magnetically trimming and erasing distortions and disturbances on both sides of the recording signal, the S/N ratio for head track position deviation is improved.
The aim is to prevent the deterioration of

FIG. 1 is a perspective view showing an example of the structure of a conventional straddle erase type magnetic head. In Fig. 1, numerals 1, 2, and 3 are core members for the recording/reproducing head that constitute the recording/reproducing head, and a closed magnetic path is formed by 1, 2, and 3. A gap is formed. 4 is a coil for the recording/reproducing head. Numerals 5 and 5' are core members for the erase head, and these 5 and 5' are provided in a slider 9 made of a non-magnetic material. The magnetic yoke 6 to which the winding 7 is attached is located at its bent portions 8, 8'.
The cores 5 and 5' are magnetically coupled to each other to form a closed magnetic path.

FIG. 2 is a diagram showing a part of the recording medium sliding surface of the magnetic head in FIG. 1 (that is, the surface on the back side of the slider 9 in FIG. 1), and 21 is a recording/reproducing gap;
Reference numerals 51 and 51' indicate magnetic pole portions of the erase head cores 5 and 5'. 51, 51' and recording/reproducing head core 1,
2 becomes the magnetic gap for erasing.

FIG. 3 is a diagram for explaining in more detail the relationship between the erasing head cores 5, 5' and the recording/reproducing head core 2, and is a sectional view taken along the line A-A' in FIG.

In the conventional straddle erase type magnetic head described above, as shown in FIG.
Since the magnetic yoke 6 for the erase head has a structure that spans over two and three, the magnetic path length of the erase head magnetic yoke 6 becomes long, resulting in poor efficiency. Furthermore, since erasing is performed by passing a direct current, the material of the magnetic yoke 6 is generally a metal such as permalloy, which has high magnetic permeability in direct current. However, in the magnetic head shown in Fig. 1, it is necessary to bend the joint portion of the magnetic yoke 6 with the magnetic cores 5, 5' for the erasing head, which causes deterioration of characteristics due to bending and variations in the joint state due to variations in bending accuracy. ,
The drawback was that the characteristics varied.

The purpose of the present invention is to eliminate these drawbacks, to create a straddle erase type magnetic field that does not bend the magnetic yoke for the erase head, makes the connection with the magnetic core for the erase head stable, and shortens the magnetic path length to improve efficiency. The aim is to provide a head.

According to the present invention, the magnetic cores for the erasing head are provided in sliders made of non-magnetic material at a predetermined interval on both sides of the magnetic core for the recording/reproducing head provided with the windings. In a straddle erase type magnetic head having a configuration in which the two magnetic cores for the erase head are magnetically coupled by a magnetic yoke provided therein, the two magnetic cores for the erase head are opposite to the sliding surface of the magnetic recording medium. a side surface of the slider is formed on the same surface as a surface of the slider opposite to the magnetic recording medium sliding surface;
A recess is formed in a part of the surface opposite to the sliding surface of the magnetic recording medium to accommodate the winding portion of the magnetic yoke provided with the winding, and the magnetic yoke provided with the winding is inserted into the slider. There is obtained a straddle erase type magnetic head characterized in that it is configured to overlap the surface opposite to the sliding surface of the magnetic recording medium.

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

FIG. 4 is a perspective view showing a straddle erase type magnetic head according to an embodiment of the present invention. In FIG. 4, numerals 1, 2, and 3 are recording/reproducing head core members constituting the recording/reproducing head, and 4 is a recording/reproducing head coil. 5 and 5' are core members for the erase head. In these core members 5, 5',
In particular, the surface 5a opposite to the sliding surface of the magnetic recording medium,
5'a is formed on the same surface as the surface 9a of the slider 9 opposite to the sliding surface of the magnetic recording medium. In order to do this, it is polished.
Reference numeral 6 denotes a magnetic yoke for the erasing head, which is made by etching or punching from a high permeability metallic magnetic material such as permalloy. As shown in the figure, this magnetic yoke 6 is provided with a winding 7 at its center. On the above-mentioned surface 9a of the slider 9,
A recess 10 that is large enough to accommodate the winding 7 with plenty of room.
is formed. This recess 10 is the slider 9
It can be easily obtained by press molding. Therefore, the erasing head magnetic yoke 6 provided with the winding 7 can be stacked on the surface 9a of the slider 9 without bending the joints with the erasing head cores 5, 5', as shown in the figure. It becomes possible. Since the surfaces 5a and 5'a of the erase head cores 5 and 5' are the same as the surface 9a of the slider 9, the magnetic yoke 6 and the cores 5 and 5' can be joined by simply overlapping the magnetic yokes 6. The magnetic coupling in the parts becomes denser, and the variation in magnetic properties becomes smaller. Furthermore, since the magnetic yoke 6 does not require bending, there is no deterioration in magnetic properties. In addition, structurally, the magnetic yoke 6 only bypasses the side of the recording/reproducing head core 1, so it is possible to shorten the magnetic path length compared to the conventional one, and improve magnetic efficiency. It also becomes more expensive.

As described above, according to the present invention, the magnetic yoke for the erase head is not bent, the magnetic coupling with the magnetic core for the erase head is stabilized, and the magnetic path length is shortened to improve efficiency. The head can be easily obtained and is very effective in practice.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional straddle erase type magnetic head, Fig. 2 is a view of the magnetic head shown in Fig. 1 viewed from below, Fig. 3 is a sectional view taken along line A-A' in Fig. The figure is a perspective view showing a straddle erase type magnetic head according to an embodiment of the present invention. 1, 2 and 3...core for recording/reproducing head, 4...
...Coil for recording/reproducing head, 5 and 5'...Core for erasing head, 51 and 51'...Magnetic pole part of core 5 and 5' for erasing head, 6...Magnetic yoke, 7
...Winding, 8 and 8'...Bending portion, 9...Slider, 10...Recessed portion.

Claims (1)

[Scope of utility model registration request] Magnetic cores 5a and 5a' for erasing heads are provided in a slider 9 made of a non-magnetic material at a predetermined interval on both sides of the magnetic cores 1, 2 and 3 for recording and reproducing heads provided with windings 4, respectively. In the straddle erase type magnetic head, the two erase head magnetic cores are magnetically coupled by a magnetic yoke 6 having a winding 7, and the magnetic recording of the two erase head magnetic cores is performed. The surface opposite to the sliding surface of the magnetic recording medium is formed on the same surface as the surface of the slider opposite to the sliding surface of the magnetic recording medium, and the surface of the slider opposite to the sliding surface of the magnetic recording medium is A recess 10 is formed in a part of the slider to accommodate the winding part of the magnetic yoke provided with the winding, and the magnetic yoke provided with the winding is placed on the side opposite to the magnetic recording medium sliding surface of the slider. A straddle erase type magnetic head characterized by being configured so that it overlaps the surface.