JPH0316091Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a perpendicular magnetic head used in combination with a perpendicular magnetic recording medium.

BACKGROUND ART Conventionally, a perpendicular magnetic head applied to devices such as perpendicular magnetic recording floppy disks and video tape recorders has a pair of grooves 11 on both sides of the center of a head base 10 made of ferrite, as shown in FIG.
11 and a winding core 12 is provided therebetween, and a pair of main pole supports 1 made of crystallized glass.
At 3 and 13, the main magnetic pole film 14 is sandwiched and fixed with adhesive.
The main pole supports 13, 13 are placed on the head base 10 so that the main pole film 14 corresponds to the center of the winding core 12, and fixed by adhesive. Next, the main magnetic pole support 1
The tips of the medium sliding surfaces of Nos. 3 and 13 are processed into an obtuse angle shape as shown in the figure, and the winding core 12 is
5 was applied to finish the head into a predetermined shape.

Incidentally, the inductance during winding of the head largely depends on the cross-sectional area of the winding core 12 of the head base 10, and tends to increase as the cross-sectional area becomes larger. If the inductance increases, the number of coil turns around the winding core 12 must be reduced, resulting in a decrease in sensitivity. Furthermore, since the impedance increases, noise increases, the S/N ratio decreases, and the recording current waveform deteriorates.

This idea was created in view of the above points, and it reduces the cross-sectional area of the winding core provided on the head base while maintaining the adhesive strength with the main pole support, without reducing the number of coil turns on the winding core. The purpose is to reduce inductance during winding.

Means for Solving the Problems In order to achieve the above object, this invention has developed a head in which a main pole support consisting of a main pole film sandwiched between a head base having a winding core in the center is combined and fixed with adhesive. In this method, grooves of a predetermined width are formed on both sides of the head base which is one level below the adhesive surface with the main pole support, and the wire is wound in the grooves of the winding core.

Function: By forming grooves on both sides of the head base and winding the wire in the grooves of the winding core, the cross-sectional area of the winding core of the head base is considerably reduced compared to conventional head structures. This allows the inductance to be reduced without reducing the number of coil turns.

In addition, since the grooves are provided on both sides of the head base one step below the adhesive surface with the main pole support, the adhesive area between the head base and the main pole support remains the same as in the conventional case, ensuring sufficient adhesion. Can maintain strength.

Embodiments Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

FIG. 1 shows a perpendicular magnetic head according to this invention, in which the same parts as in the above-mentioned conventional example are denoted by the same reference numerals, and their explanation will be omitted. The difference is the head base 20.
The kerf grooves 24, 24 are formed in the grooves 24, 24.

The head base body 20 is made of ferrite material (Mn-Zn or Ni-Zn type) in the shape of a rectangular block as described above, and a winding core 22 is provided between a pair of grooves 21, 21 formed in the center of the upper part. ing.
A coil 25 is wound around the winding core 22 .

The tips of the medium sliding surfaces of the main pole supports 13, 13 are formed in an obtuse triangular shape such that the center portion where the main pole film 14 is sandwiched protrudes toward the tips.

A cut groove 24 is formed in a portion of the head base 20 that is one step lower than the adhesive surface with the main pole supports 13, 13. The grooves 24 are on both sides of the head base 20.
It is recessed across the width direction perpendicular to the main pole film 14 . The cut grooves 24 are formed by grooving one side at a time using a precision processing machine such as a dicer.

The width of the kerf 24 is slightly wider than the interval between the portions of the winding core 22 around which the coils 25 are wound.
The formation of the kerf 24 reduces the core width of the winding core 22 and reduces its cross-sectional area. This reduction in cross-sectional area reduces the inductance of the head. Furthermore, the coil 25 can be wound around the winding core 22 without reducing the number of turns of the coil.

According to the above configuration, the kerf 24 is formed on the head base 2.
0 and the main magnetic pole supports 13, 13, the adhesive area is no different from that of the conventional structure.
Sufficient adhesive strength can be ensured.

In the above embodiment, the cut grooves 24 are formed across the entire length of the head base 20 in the width direction, but as shown in FIG. It may also be provided.

Effects of the Invention As explained above, according to the perpendicular magnetic head structure according to the invention, the core width of the winding core is reduced, and its cross-sectional area can be reduced compared to the conventional structure. Therefore, head inductance can be reduced without reducing the number of coil turns around the winding core. This lowers the impedance of the head, reducing noise and reducing S/N.
As the ratio improves, the recording current waveform also improves.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a perpendicular magnetic head according to the present invention, FIG. 2 is a perspective view showing another embodiment of the same magnetic head, and FIG. 3 is a perspective view showing a conventional head structure. 20... Head base, 13, 13... Main magnetic pole support, 24, 30... Cut groove, 14... Main magnetic pole film.

Claims (1)

[Claims for Utility Model Registration] (1) A head base made of ferrite material and having a winding core between a pair of grooves formed in the center;
a main pole support consisting of a pair of crystallized glasses, which are sandwiched and fixed with a patterned main pole film, and which are combined and adhesively fixed to the head base so that the main pole film corresponds to the winding core; A cut groove of a predetermined width is formed on both sides of a portion of the head base that is one step below the adhesive surface with the main pole support, and the wire is wound in the cut groove of the winding core. A vertical magnetic head consisting of (2) The vertical magnetic head according to claim 1, wherein the cut grooves are provided on both sides of a portion of the winding core. (3) The perpendicular magnetic head according to claim 1, wherein the cut grooves are provided on both sides of the head base body across the width direction.