JPH041924B2 - - Google Patents

Description

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

[Prior art]

A magnetic head for a floppy disk is a tunnel erase type magnetic head in which an erasing head core is provided on both sides of a recording/reproducing head core with an erasing magnetic gap in the same direction as the magnetic gap, and a tunnel erase type magnetic head is provided on both sides of a recording/reproducing head core. There is a straddle erase type magnetic head in which erase head cores are arranged at regular intervals. 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 position shift of the track of the magnetic head can be corrected. This improves the resulting signal-to-noise ratio.

[Problem that the invention seeks to solve]

By the way, this type of magnetic head has a narrow recording/reproducing gap of 2 μm or less and an erasing gap of around 20 μm or less due to high-density recording.
Also, the overall dimensions are width W and depth L approximately 6 x 6 mm.
Components such as the core and slider require high processing accuracy.

In addition, the bonding (adhesion) of these components is performed using low-melting glass or special resin, but this creates an extremely narrow magnetic gap, which makes the work complicated and requires a lot of man-hours, and furthermore, the characteristics may deteriorate. In order to obtain a large number of uniform magnetic heads, a high level of skill is required in the assembly work, which has the drawback of limited reliability and quality assurance, and increased costs.

The present invention is intended to solve these problems, and aims to provide a straddle erase type magnetic head with good reliability and productivity by providing a rational manufacturing method.

[Means for solving problems]

The present invention provides a method for manufacturing a magnetic head having a magnetic gap for recording and reproducing on both sides thereof and a magnetic gap for erasing in a direction perpendicular to the magnetic gap for recording and reproducing. (2) forming a groove in a non-magnetic plate material that will become the slider portion in a direction across the plate material for fitting the U-shaped core; (3) Transfer the U-shaped core obtained in step (1) above to step (2) above.
(4) fixing the U-shaped core obtained in step (3) above by fitting it into the groove of the non-magnetic plate material obtained in step (3) above, and fixing the U-shaped core and the non-magnetic plate material; (5) dividing the non-magnetic plate material along two imaginary lines in the thickness direction so that the U-shaped core is vertically symmetrical; A step of forming a recording/reproducing head core with a magnetic gap formed therein; The bottom part of the recording/reproducing head core is held and fixed, thereby forming a magnetic gap on both sides of the magnetic gap of the recording/reproducing head core between the U-shaped core divided in step (4) above. A method of manufacturing a magnetic head is characterized in that it comprises a step of forming a slider member having a magnetic gap for erasing.

〔Example〕

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

FIG. 1 is a diagram showing the shape of a non-magnetic plate material 1 that is to become a slider. CaTiO ₃ or BaTi ₄ O ₂₀
A U-shaped groove 2 is formed approximately in the center of a flat plate made of a non-magnetic material having a coefficient of thermal expansion similar to that of a ferrite core such as ferrite core.

FIG. 2 is a diagram showing a soft magnetic core member 3 that is to become an erasing core, and has a thin wall thickness (for example, t=0.15~
0.17) It is made of hot isostatically pressed (HIP) soft magnetic materials such as Mn-Zn ferrite and Ni-Zn ferrite, and has a U-shape as a whole. Side cores 5a and 5b connecting the upper and lower cores 4a and 4b of the U-shaped core 3 form an erasing gap.

As shown in FIG. 3, the U-shaped core 3 shown in FIG. 2 is fitted into the U-shaped groove 2 of the non-magnetic plate 1 shown in FIG. 1 and fixed with resin or glass.

Thereafter, as shown in FIG. 4, two imaginary lines C are drawn in the thickness direction so that the U-shaped core 3 is vertically symmetrical.
-C', D-D', cut the non-magnetic plate material 1 together with the U-shaped core 3, and cut the non-magnetic plate material 1 on both upper and lower sides.
Divide into a and 1b.

Next, as shown in FIG. 5, the upper and lower divided pieces are arranged so that the side cores 5a and 5b face each other, and between them, the approximately U-shaped recording/reproducing head core 6 is inserted into the magnetic gap G. Insert it in the part where it has.

This recording/reproducing head core 6 has two cores 6.
A and 6b are joined together with glass or the like to form a U-shape in advance.

In this way, as shown in FIG. 6, 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 U-shaped cores 5a, 5b.

After this, as shown in FIG. 7, the R/W coil 7 is attached to the recording/reproducing head core 6, and the recording/reproducing back bar 8 is attached to form a closed magnetic path. A magnetic head is completed by attaching an erasing back bar 10 having an erasing coil 9 to the octopus-shaped core 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 the slider member is kept to a minimum, and all the slider members can be manufactured by cutting, so the assembly work is efficient, and the dimensional accuracy, especially Magnetic gapping can be performed with high precision, improving productivity and reliability, and reducing costs.

[Brief explanation of drawings]

Figure 1 shows the non-magnetic plate material that will become the slider part, Figure a is a plan view, Figure b is a sectional view taken along line A-A' in Figure A, and Figure 2 shows the eraser head core and the core to be replaced. 3 is a diagram showing the process of combining the non-magnetic plate material in FIG. 1 and the U-shaped core in FIG. 2, and shows the combination relationship. FIG. 4 is a cross-sectional view taken along the line B-B' of FIG. 3 after the combination, and FIG.
The figure is a perspective view showing the combination of the divided pieces and the recording/reproducing head, FIG. 6 is a perspective view of the bottom side after they are assembled, and FIG.
FIG. 8 is a perspective view showing a state in which the R/W core and the back bar for recording/reproduction are assembled, and FIG. 8 is a perspective view showing a state in which the assembly shown in FIG. 7 is assembled with the erase core and the back bar for erasing. 1...Nonmagnetic plate material for slider, 2...Groove, 3...
...U-shaped soft magnetic core, 4a, 4b...Upper and lower cores of the U-shaped core, 5a, 5b...Side cores of the U-shaped core, 6a, 6b...Head core for recording and reproduction, G...Recording and reproduction Magnetic gap for Ge, Ge′…
...Magnetic gap for erasing.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a magnetic head having erasing magnetic gaps on both sides of a recording/reproducing magnetic gap in a direction orthogonal to the magnetic gap, comprising: (1) manufacturing a soft magnetic material as a whole to provide an erasing head core; (2) forming a groove in a non-magnetic plate material that will become the slider portion in a direction across the plate material for fitting the U-shaped core; (3) The U-shaped core obtained in step (1) above is
(4) fitting the U-shaped core obtained in step (3) into the groove of the non-magnetic plate material obtained in step (3) above to fix the U-shaped core and the non-magnetic plate material; A process of dividing the fixed non-magnetic plate material along two imaginary lines in the thickness direction so that the U-shaped core is vertically symmetrical; (6) forming a recording and reproducing head core with a magnetic gap for recording and reproducing; The bottom of the reproducing head core is held and fixed, thereby forming a magnetic gap on both sides of the magnetic gap of the recording/reproducing head core between the U-shaped cores divided in step (4) above. 1. A method of manufacturing a magnetic head, comprising the step of forming a slider member having an erasing magnetic gap.