JPS60133512A - Production of magnetic head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a recording/reproducing magnetic head used mainly in a magnetic recording/reproducing device for digital signals.

[Prior art]

As a recording/reproducing head for a floppy disk, there is a tunnel erase type magnetic head in which an erasing head is provided with an erasing magnetic gap in the same direction as the magnetic gap on both sides of the core of the recording/reproducing head; There is a straddle-type magnetic head nod in which eraser rad cores are arranged at regular intervals on both sides. In either case, by magnetically trimming and erasing the distortion or disturbance on both sides of the recorded signal due to the leakage magnetic field generated between the erase head core and the recording/reproducing head core, the track position deviation of the magnetic head can be corrected. This improves the resulting signal-to-noise ratio.

By the way, this type of magnetic head has a recording/reproducing gap of 2 μm or less due to high-density recording, and an erasing gap of 2 μm or less.
Narrow from front to back or less.

Further, the overall dimensions are approximately 6 x 6 m in width W and depth, and high processing precision is required for the constituent members such as the core and slider.

In addition, the joining (adhesion) of these components is performed using low-melting point glass or special resin, but the work is complicated and requires a large number of man-hours to form an extremely narrow magnetic gap. In order to obtain a large number of magnetic heads with uniform properties, a high level of skill is required in the assembly work, which limits reliability and quality assurance, and increases costs.

[Purpose of the invention]

The present invention aims to solve these problems.

We provide efficient manufacturing methods and highly reliable and productive software.
The object of the present invention is to provide a ladle erase type magnetic head.

[Structure of the invention]

The present invention relates to a method of manufacturing a magnetic head having magnetic erasing gaps on both sides of a magnetic recording/reproducing gap in a direction perpendicular to the magnetic recording/reproducing gap.

(1) Forming a soft magnetic plate material into an overall wing-shaped core with a protrusion at the bottom and approximately in the center to provide a core for an erase head.

(2) A groove into which the wing-shaped core fits is formed in a non-magnetic plate material that will become a part of the slider in a direction across the plate material, and the protrusion is fitted into the longitudinal center of the groove. and forming a hole that can be exposed on the back surface.

(3) Fitting the wing-shaped core obtained in step (1) above into the groove while fitting the protrusion into the hole of the non-magnetic plate material obtained in step (2) above, a step of fixing the wing-shaped core and a non-magnetic plate material;

(4) Pass the non-magnetic plate material to which the wing-shaped core obtained in the step (3) above is fixed, through two positions separated from each other on the protrusion of the wing-shaped core, and a step of dividing along two imaginary lines perpendicular to the present direction;

(5) forming a recording/reproducing head core that is approximately U-shaped and has a recording/reproducing magnetic gap formed at the bottom of the U'-shape;

(6) The bottom part of the LLU"-shaped recording/reproducing rad core obtained in step (5) is held and fixed with the left and right divided pieces, excluding the center part, which were divided in step (4) above. death,
Thereby, a step of forming a slider member having an erasing magnetic gap formed between the wing-shaped core divided in (4) above on both sides of the magnetic gap of the recording/reproducing head core.

1. A method of manufacturing a magnetic head, comprising:

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

〔Example〕

The present invention will be explained using the drawings.

FIG. 1 is a diagram showing the shape of a non-magnetic plate material that is to become a part of the slider. CaTiO3 or BaTi40□0
A groove 2 extending across the center of a flat plate made of a non-magnetic material having almost the same coefficient of thermal expansion as a ferrite core is formed in a straight line. forms a through hole 3.

FIG. 2 is a diagram showing a soft magnetic core member 4 that is to serve as an erasing core.
wa) It is composed of a hot isostatically pressed (HIP)-treated soft magnetic material such as Mn-Z, n-ferrite, Ni-Zn ferrite, etc., and mechanically reinforces the protrusions 5 on the left and right sides of the core and the lower part. It is filled with glass 6, and the overall shape is wing-shaped.

The protrusion 5 serves to form an erasing gap.

With reference to FIG. 3, in the groove 2 of the non-magnetic plate material 1 of FIG.
The wing-shaped core 4 shown in FIG. 2 is fitted and fixed. At this time, the protrusion 5 is fitted into the hole 3 and the end surface is exposed on the bottom surface of the non-magnetic plate material 1. Note that the fixation is performed using glass or resin.

After that, two imaginary lines B passing through two points on the protrusion 5 of the wing-shaped core 4 and extending in a direction perpendicular to the extending direction of the core 4 are created.
-B', C-C', the non-magnetic plate material 1 is cut together with the wing-shaped core 4 to divide it into five pieces: left and right pieces and a central piece.

Subsequently, as shown in FIG. 4, a substantially U-shaped helad core 7 for recording and reproduction is sandwiched between the left and right divided pieces at the portion thereof having the magnetic gap G.

The recording/reproducing HEAD core 7 has two cores 7a and 7b.
It is formed in advance into a U-shape by joining them with glass or the like.

In this way, as shown in FIG. 5, a slider member is obtained in which erasing gaps Ge, Ge are formed on both sides of the recording/reproducing magnetic gap G by the cut airfoil cores 4a, 4b.

After this, as shown in FIG.
/W coil 8 is inserted and a banker 9 is attached to form a closed magnetic path, and then an erasing backer 11 having an erasing coil 10 is attached to the airfoil core section divided into two parts as shown in FIG. The magnetic head is completed by attaching it to form a closed magnetic path.

〔Effect of the invention〕

As is clear from the description of the above embodiments, in the present invention, the cutting of one slider member is kept to a minimum, so the efficiency of the assembly work is high, and it is also possible to perform dimensional accuracy, especially the magnetic gap with high precision. This has improved productivity, reliability, and reduced costs.

[Brief explanation of drawings]

Figure 1 is a diagram showing a non-magnetic plate material that becomes part of the slider.
(a) is a plan view, (b) is a sectional view taken along the line AA' in (,), and FIG. ) The figure is a front view. (b) is a bottom view, and FIG. 3 is a diagram showing the process of combining the non-magnetic plate material in FIG. 1 and the airfoil core in FIG.
) is a perspective view showing the combination relationship, and (b) is a cross-sectional view taken along the line AA' in FIG. 3(a) after the combination. FIG. 4 is a perspective view showing the combination of the nine divided pieces and the recording/reproducing head, FIG. 5 is a perspective view of the bottom side after the two pieces are combined, and FIG. /W
FIG. 7 is a perspective view showing a state in which the core and back bar are assembled, and FIG. 7 is a perspective view showing a state in which the eraser core and back bar are assembled to the assembly shown in FIG. 6. 1...Non-magnetic plate system for slider, 2...Groove. 3... Hole, 4... Airfoil-shaped soft magnetic core, 5... Projection. 7... Rad core for recording and reproduction, G... Magnetic gap for recording and reproduction, Ge... Magnetic gap for erasing. Figure 4/b Figure 5

Claims (1)

Claims: 1. A method for manufacturing a magnetic head having an erasing magnetic gap on both sides of a recording/reproducing magnetic gap in a direction perpendicular to the recording/reproducing magnetic gap. (1) Forming a soft magnetic plate material into an overall wing-shaped core having a protrusion at the bottom and approximately in the center to provide a core for an erase head. (2) A groove into which the wing-shaped core fits is formed in a non-magnetic plate material that will become a part of the slider in a direction across the plate material, and the protrusion is fitted into the longitudinal center of the groove. and forming a hole that can be exposed on the back surface. (3) Fitting the wing-shaped core obtained in step (1) above into the groove while fitting the protrusion into the hole of the non-magnetic plate material obtained in step (2) above, a step of fixing the wing-shaped core and a non-magnetic plate material; (4) Pass the non-magnetic plate material to which the wing-shaped core obtained in the step (3) above is fixed, through two positions separated from each other on the protrusion of the wing-shaped core, and a step of dividing along two imaginary lines perpendicular to the present direction; (5) A step of forming a RAD core for recording and reproducing which is approximately U-shaped and has a magnetic gap for recording and reproducing formed at the bottom of the u and n' shapes. (6) Hold the bottom of the "U" shaped recording/reproducing rad core obtained in step (5) above with the split pieces on both left and right sides, excluding the center part, which were split in step (4) above. and fixed,
Thereby, a step of forming a slider portion having an erasing magnetic gap formed between the wing-shaped core divided in the above (4) on both sides of the magnetic groove of the recording/reproducing head core. A method of manufacturing a magnetic head, characterized in that: It is a string mortar