JPH0247003B2 - JIKIHETSUDONOSEIZOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic recording/reproducing head used primarily 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, and a recording/reproducing head. There is a straddle type magnetic head in which erase head cores are disposed at a constant interval on both sides of the head. In either case, the tracks of the magnetic head are removed 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 core for the erase head and the core for the recording/reproducing head. This improves the signal-to-noise ratio caused by positional deviation.

[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 precision.

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 that provides a rational manufacturing method and has good reliability and productivity.

[Means for solving problems]

The present invention provides a method for manufacturing a magnetic head having erasing magnetic gaps on both sides of a recording/reproducing magnetic gap in a direction perpendicular to the recording/reproducing magnetic gap. (2) fitting the wing-shaped core into a non-magnetic plate material that will become the slider section in a direction transverse to the plate material; a step of forming a matching groove and fitting the protrusion into both lengthwise ends of the groove to form a cross section that can be exposed on the back surface; (3) the blade obtained in step (1) above; A step of fixing the wing-shaped core and the non-magnetic plate by fitting the shaped core into the groove while fitting the protrusion into the hole of the non-magnetic plate obtained in step (2) above. and (4) dividing the non-magnetic plate material to which the wing-shaped core obtained in step (3) above is fixed along two imaginary lines perpendicular to the extending direction of the wing-shaped core. (5) a step of forming a recording/reproducing head core that is approximately U-shaped and has a magnetic gap for recording/reproducing at the bottom of the U-shape; (6) excluding the central portion divided in step (4) above. The bottom part of the U-shaped recording/reproducing head core obtained in step (5) above is held and fixed between the left and right divided pieces, so that the above-mentioned pieces are attached to both sides of the magnetic gap of the recording/reproducing head core. (4) Forming a slider member having an erasing magnetic gap formed between the divided wing-shaped cores.

〔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 nonmagnetic plate material that is to become a slider. A groove 2 extending across the center of a flat plate made of a non-magnetic material having almost the same thermal expansion coefficient as a ferrite core such as CaTiO ₃ or BaTi ₄ O ₂₀ is formed in a straight line. Through-holes 3a and 3b are formed at both ends of the bottom.

FIG. 2 is a diagram showing a soft magnetic core member 4 that is to become an erasing core, and has a thin wall thickness (for example, t=0.15
~0.17) It is composed of hot isostatically pressed (HIP) soft magnetic materials such as Mn-Zn ferrite and Ni-Zn ferrite, and has an overall airfoil shape. The protrusions 5a and 5b are for forming an erasing gap.

As shown in FIG. 3, the wing-shaped core 4 shown in FIG. 2 is fitted into the groove 2 of the non-magnetic plate 1 shown in FIG. 1 and fixed with resin or glass. At this time, the protrusions 5a, 5
b is fitted into the holes 3a and 3b, and the end surface is exposed to the bottom surface of the non-magnetic material 1.

After that, the wing-shaped core 4 is
At the same time, the non-magnetic plate material 1 is cut and divided into three parts: left and right divided pieces and a central divided piece.

Subsequently, as shown in FIG. 5, the left and right divided pieces are left and right reversed, and a substantially U-shaped recording/reproducing head core 6 is sandwiched therebetween at the portion having the magnetic gap G. (In other words, the head core 6 for recording and reproduction is held between the back surfaces of the cut surfaces.) This head core 6 for recording and reproduction consists of 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, cut airfoil cores 4 are placed on both sides of the recording/reproducing magnetic gap G.
A slider member having erasing gaps Gea and Geb formed by a and 4b is obtained.

After that, as shown in FIG. 7, the P/W coil 7 is attached to the recording/reproducing head core 6, and the 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 core part to form a closed magnetic path.

〔Effect of the invention〕

As is clear from the description of the above embodiments, in the present invention, cutting of the slider member is kept to a minimum, so the assembly work is efficient, and dimensional accuracy, especially the magnetic gap, can be made with high precision. Productivity and reliability have improved, and costs have also been reduced.

[Brief explanation of the drawing]

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 of FIG. 1 and the airfoil core of FIG. 2, and shows the combination relationship. FIG. 4 is a cross-sectional view taken along the line D-D' of FIG. 3 after they are assembled, FIG. 5 is a perspective view showing the combined relationship between the divided pieces and the recording/reproducing head, and FIG. is a perspective view of the bottom side after being assembled, and FIG. 7 is a perspective view of the bottom side after being assembled, and FIG.
FIG. 8 is a perspective view showing a state in which the P/W coil and back bar are assembled, and FIG. 8 is a perspective view showing a state in which the erase core and back bar are assembled to the assembly shown in FIG. 1: Non-magnetic plate material for slider, 2: Groove, 3a, 3
b: Through hole, 4: Airfoil-shaped soft magnetic core, 5a, 5b:
Projections, 6a, 6b: recording/reproducing head core, G: magnetic gap for recording/reproducing, Ge: magnetic gap for erasing.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a magnetic head having magnetic erasing gaps on both sides of a recording/reproducing magnetic gap in a direction orthogonal to the magnetic gaps, including: (1) using a soft magnetic material to provide an erasing head core; (2) forming a core in the shape of an airfoil as a whole with protrusions at both ends of the bottom; (2) forming a groove in a non-magnetic plate material that will become the slider portion in a direction across the plate material into which the wing-shaped core is fitted; (3) the wing-shaped core obtained in step (1) above, A step of fixing the wing-shaped core and the non-magnetic material by fitting the protrusions into the grooves while fitting the cut portions at both ends of the non-magnetic plate material obtained in step (2) above; 4) dividing the non-magnetic plate material to which the wing-shaped core obtained in step (3) above is fixed along two imaginary lines perpendicular to the extending direction of the wing-shaped core; 5) A step of forming a recording/reproducing head core that is approximately U-shaped and has a magnetic gap for recording/reproducing at the bottom of the "U"shape; (6) A step of forming a head 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"; The split pieces on both sides sandwich and fix the bottom of the U-shaped recording/reproducing head core obtained in step (5) above, and thereby the above (4) ) forming a slider member having an erasing magnetic gap formed between the slider member and the wing-shaped core divided by the slider member.