JPS61208608A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To attain accurate management of depth of a recording and reproducing magnetic gap by clipping a slider with both side faces of a magnetic core member and forming an erasure magnetic gap at both sides of a recording and reproducing magnetic gap so as to cut off the magnetic head member at the midpoint. CONSTITUTION:The short sides of an L-shaped erasure magnetic core member of the slider are butted to the magnetic core member at both side faces around the magnetic core member and the slider is clipped corresponding to a recording and reproducing magnetic gap 4, they are bonded by low melting point glass to obtain the magnetic head member. The magnetic head member is cut off at lines B-B, B'-B', C-C, C'-C', D-D, D'-D' perpendicular to the recording and reproducing magnetic core members 1, 2 altogether. The parts between the B-B and B'-B', between C-C and C'-C', and between D-D and D'-D' are used for margins for cut-off. Thus, one magnetic head member 9 where an erasure magnetic gap 8 is formed at both sides of the recording and reproducing magnetic gap 4 by the L-shaped magnetic core member 5 is obtained. Thus, the depth of the recording and reproducing magnetic gap 4 is managed uniformly with high accuracy and the magnetic head with high productivity and reliability is obtained.

Description

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

[Conventional technology]

A recording/reproducing head for a floppy disk is a tunnel erase type magnetic head in which an erasing magnetic head is provided on both sides of the recording/reproducing magnetic head with an erasing magnetic gap in the same direction as the magnetic gap, and a recording/reproducing magnetic head. A struttle erase magnetic head is used in which erasing magnetic heads are arranged at regular intervals on both sides of the head. In any magnetic head, the magnetic field generated between the magnetic core of the recording/reproducing magnetic head and the magnetic core of the erasing magnetic head magnetically adjusts the distortion or disturbance of the recorded signal, and the signal pair caused by the positional deviation of the track. The noise ratio must be improved.

In addition, for high-density recording, this type of magnetic head has a recording/playback magnetic gear knob of approximately 2 μm and an erase magnetic gap of 20 μm.
It is extremely narrow, around μm, and the overall dimensions are 6W in both width and depth.
It is of a small size. Further, components such as the magnetic core and the slider are bonded using low melting point glass or special resin.

[Problem that the invention seeks to solve]

This type of magnetic head requires high processing precision because the components such as the magnetic core and slider are extremely small, and the work is complicated and requires many man-hours to form an extremely narrow magnetic gap, and the characteristics are not uniform. In order to obtain a large number of magnetic heads, skill is required in the assembly work, and the depth of the recording/reproducing magnetic gap formed after one assembly must be precisely controlled, which limits reliability and quality control, leading to high costs. There are drawbacks.

[Means for solving problems]

The present invention provides a struttle-erase type magnetic head with good reliability and productivity by a rational manufacturing method that eliminates such drawbacks of the conventional method.

The method for manufacturing a magnetic head according to the present invention is to place inverted T-shaped recording/reproducing magnetic core materials made of soft magnetic material on both sides, and arranging one or more inverted π-shaped recording/reproducing magnetic core materials inside, with the bottom end face of each being placed on both sides. A first step of shaping the magnetic core material to be bonded to form a recording/reproducing magnetic gap, and an L made of soft magnetic material.
a second step of arranging the same number of character-shaped erasing magnetic core materials at the same positions as the recording/reproducing magnetic gaps, and adhering slider materials such as non-magnetic materials to both sides thereof to form a slider part; The slider portion formed in the second step is held between both sides of the magnetic core material in which the recording/reproducing magnetic gap formed in the first step is formed, and the erasing magnetic gap is formed on both sides of the recording/reproducing magnetic gap. A third step of forming a head material, and manufacturing a straddle erase type magnetic head by cutting the magnetic head material obtained in the third step at right angles to the magnetic core material and in the middle of the recording/reproducing magnetic gap. It's a method.

[Effect]

A plurality of recording/reproducing magnetic core materials and slider materials are serially connected and then cut to manufacture a plurality of magnetic head members at once.

〔Example〕

An embodiment of the method for manufacturing a magnetic head of the present invention will be described with reference to the drawings.

Both sides of three inverted π-shaped recording/reproducing magnetic core materials 1 made of a thin soft magnetic material with a thickness of about 0.12 to 0.3 mm, which is made of Mn-Zn ferrite or Ni-Zn ferrite subjected to hot isostatic pressing. As shown in FIG. 1, inverted T-shaped recording/reproducing magnetic core materials 2 are arranged vertically. Adjacent protruding end surfaces 3 at the bottom are joined with low melting point glass to form a recording/reproducing magnetic gap 4 and form a magnetic core material. Next, as shown in FIG. 2, the same number of L-shaped erasing magnetic core materials 5 made of a soft magnetic material are arranged at the same position as the recording/reproducing magnetic gap 4, and C, aTi03 or BaTi4 are coated on both surfaces of each core material.
A slider material 6 made of a non-magnetic material having a coefficient of thermal expansion substantially the same as that of ferrite such as 02° is sandwiched and adhesively buried to form a slider portion. This L-shaped erase magnet 7A material 5 is A in FIG.
As shown in FIG. 3, which is a cross-sectional view of -A, it is arranged on the slider member 6 with its long side horizontal and its short side vertical.

Here, as shown in FIG. 4, the short sides of the L-shaped erasing magnetic core material 5 of the slider section are placed on both sides of the magnetic core material in the center so that they butt against the magnetic core material and correspond to the position of the recording/reproducing magnetic gap 4. The magnetic head material as shown in FIG. 5 is obtained by sandwiching and bonding with low melting point glass or the like. When viewed from another side, as shown in FIG. 6, a recording/reproducing magnetic gap 4 and an erasing magnetic gap 8 are projected from the contact surface 7 with the magnetic medium. Here, the magnetic head materials shown in FIG. 5 and FIG.
, C-C, C'-C', D-D.

Cut both along the o/-D/ line. This B-B,
Between B'-87, C-C, C'-C' and D-D
, D'-D' is the machining allowance for cutting. Therefore, as shown in FIG. 7, one magnetic head member 9 is obtained in which an erasing magnetic gap 8 is formed by the L-shaped erasing magnetic core material 5 on both sides of the recording/reproducing magnetic gap 4.

Thereafter, as shown in FIG. 8, a recording/reproducing coil 10 is wound around the recording/reproducing magnetic core 1, and a back bar 11 is installed between the legs of the image recording/reproducing magnetic core to form a closed magnetic path. As shown in FIG.
A closed magnetic path is formed by attaching a penetrating erasing back bar 13 to obtain a struttle erase type magnetic head.

〔Effect of the invention〕

As described above, according to the present invention, two or more magnetic heads can be obtained by bonding the recording/reproducing magnetic core material and the slider part once, and the contact surface 7 with the magnetic medium is polished before cutting. Particularly.

Recording/reproducing magnetic gap 4 of all recording/reproducing magnetic heads
The depth can be controlled uniformly and with high precision, and a magnetic head with high assembly efficiency, productivity, and reliability can be obtained.

[Brief explanation of drawings]

FIG. 1 is an assembly diagram of a recording/reproducing magnetic core material in an embodiment of the method for manufacturing a magnetic head of the present invention. (,) is a front view, (b) is a bottom view, FIG. 2 is an assembled view of the slider section according to the present invention, (a) is a top view, (b) is a front view, and FIG. b) A side view of the A-A cross section, FIG. 4 is an external perspective view showing the process of assembling the slider parts on both sides of the recording/reproducing magnetic core material of FIG. 1, and FIG. FIG. 6 is an external perspective view of the magnetic head material shown in FIG. 5 when viewed from the bottom, and FIG. 7 is a perspective view of the magnetic head material shown in FIGS.
B. B'-B', C-C, C'-C', D-D, D'
- An external perspective view of the magnetic head member formed by cutting at D' as seen from the bottom; FIG. 8 is an external perspective view of a recording/reproducing magnetic core wound with a recording/reproducing coil and a back bar attached;
FIG. 9 is an external perspective view of the struttle erase type magnetic head shown in FIG. 8 with an erasing coil and an erasing back bar attached thereto. Note that 1.2: recording and reproducing magnetic member, 3: projecting end surface. 4: Recording/reproducing magnetic gap, 5: Erasing magnetic core material, 6:
Slider material, 7: Contact surface, 8: Erase magnetic gap, 9:
Magnetic head member, 10: recording/reproducing coil, 11: back bar, 12: erasing coil. 13: Back bar for erasing. Figure 1 Figure 2 (a) Figure 3 Figure 4 Figure 5 Figure 7 Figure 9 Figure 8

Claims (1)

[Claims] 1. A plurality of inverted π-shaped recording/reproducing magnetic core materials 1 made of soft magnetic material and inverted T-shaped recording/reproducing magnetic core materials 2 on both outer sides are connected and adhered at the bottom projecting end surfaces 3 to form the recording/reproducing magnetic gap 4. a first step of forming a magnetic core material, and disposing the same number of L-shaped erasing magnetic core materials 5 made of a soft magnetic material at the same position as the recording/reproducing magnetic gap 4;
a second step of adhesively disposing rectangular slider members 6 made of a non-magnetic material on both sides of the L-shaped erasing magnetic core material 5 to form a slider portion; and A third step of sandwiching and adhering the slider portions formed in the second step to both sides of the core material to form the recording/reproducing magnetic gap 4 and the erasing magnetic gap 8 to form a magnetic head material. and a plurality of magnetic head members 9 are obtained by cutting the magnetic head material formed in the third step in a direction perpendicular to the magnetic head material at an intermediate position of the recording/reproducing magnetic gap 4. A method for manufacturing a struttle erase type magnetic head.