JPS5812647B2 - Jikihetsudono Seizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic head with high precision.

Shape and dimension factors that influence the characteristics of a magnetic head include the size of the magnetic gap, the magnetic recording width, and the depth of the magnetic gap.

Among these, many improvements have been made to date with respect to the magnetic gap and recording width, and high precision has been achieved.

However, there is still no definitive answer regarding the depth of the magnetic gap.

In the conventional magnetic head manufacturing method, as shown in FIGS. 1 to 5, a rectangular parallelepiped-shaped ferromagnetic upper core material 1 and ferromagnetic lower core material 2 having the same dimensions are prepared.

A groove 4 is provided on the upper surface 7 of the lower core material 2 so as to have an inclined inner wall 3 at a distance D from the side surface 6.

The upper core material 1 is superposed on the upper surface 7 of the lower core material 2 with its end surfaces 5 and 8 aligned, and then the side surfaces are removed by grinding.

Furthermore, it was cut into a magnetic head body as shown in FIG.

As shown in FIGS. 4 and 5, the finished distance from the side surface of the magnetic head to the upper edge of the inclined inner wall 3, that is, the final magnetic gap depth d is set to 0.1 to 0.2 m11L,
Further, the dimension D before the side surface processing in FIGS. 2 and 3 is a value that is more than ten times the final magnetic gap depth d.

In such a process, in order to obtain the void depth d, the distance D was measured in FIG. 2, and the difference between the distance D and the void depth d was removed while observing from the direction a in FIG. 4.

However, in this method, the end surfaces 5 of the upper and lower core materials 1 and 2
and 8 are generally not mirror surfaces, so errors were large and accuracy was poor.

SUMMARY OF THE INVENTION The present invention aims to improve the above-mentioned drawbacks and provide a method for manufacturing a magnetic head, which aims to easily obtain the gap depth with high accuracy.

To explain an embodiment of the present invention with reference to the drawings, a ferromagnetic upper core material 1 and a ferromagnetic lower core material 2 are each prepared as a rectangular parallelepiped of the same shape, and are placed on the tenth surface 7 of the lower head material 2 at a distance D from the side surface 6. A groove 4 having an inclined inner wall 3 is provided in the groove 4 .

Polymerizing the upper core material 1 on the upper surface 7 of the lower core material 2 is the same as the conventional method, but in this case, the upper core material 1 is placed at a distance g from the end surface 5 of the lower core material 2 on the upper surface 7. so that the end face 8 of 1 is positioned.

Thereafter, as in the conventional method, the sides of the upper and lower core materials 1 and 2 are scraped off and further cut to form a magnetic head.

In the present invention, when obtaining the magnetic gap d, the end faces 5 and 8 of the upper and lower core materials are shifted by a distance g.

Furthermore, since the overlapping surfaces of the upper and lower core materials 1 and 2 are generally mirror-finished, the distance D from the pressing surface 6 to the upper edge of the inclined inner wall 3 can be easily measured with high accuracy, even during cutting.

FIG. 7 shows a second embodiment of the present invention, in which the length l2 of the lower core material is greater than the length l1 of the upper core material 1.

As described above, according to the present invention, the air gap depth can be easily measured with high accuracy in the manufacturing of a magnetic head, so that a magnetic head with stable performance can be obtained.

[Brief explanation of drawings]

1 to 5 are perspective views showing steps of a conventional magnetic head manufacturing method, FIG. 6 is a perspective view showing an embodiment of the method of the present invention, and FIG. 7 is a second embodiment of the method of the present invention. FIG. 1... Upper core material, 2... Lower core material, 3... Inclined inner wall, 4... Groove, 5
, 8... end face, 6... side surface, 7...
...Top surface.

Claims (1)

[Claims] 1. On the upper surface of a ferromagnetic core material having an upper surface provided with a groove having an inclined inner wall at a predetermined distance from the side surface, another ferromagnetic core material is placed at a certain distance from the end surface of the core material. A method of manufacturing a magnetic head, which comprises positioning and overlapping the end surfaces, and cutting off the side surfaces of the pair of cores.