KR890003553B1 - Magnetic head - Google Patents

Abstract

Coil receiving grooves are provided on opposite sides of a block of magnetic material made of sendust. A coil receiving grooves is cut in a second block of magnetic sendust material. A number of track width regulating grooves are cut in both the first and second blocks. The regulating grooves extend in a direction perpendicular to the coil receiving grooves. A non-magnetic layer having a thickness equal to approximately half the width of a desired head cap is provided on predetermined portions of first surfaces of the magnetic blocks. The first surfaces of the magnetic blocks are placed with a foil of a silver brazing alloy inserted between portions of the first surfaces.

Description

Magnetic head

Figure 1 shows an embodiment of the present invention, Figure 1 is a magnetic core block perspective view.

2 to 5 are explanatory perspective views illustrating a method of manufacturing a magnetic core block.

6 is a frequency diagram of the regeneration power band according to the glass working temperature.

* Explanation of symbols for main parts of the drawings

1, 2: magnetic blocks 1a, 2a: head core half body

4: nonmagnetic layer 5: groove for track width regulation

6: glass

The present invention relates to a magnetic head having a sufficient recording and reproducing capability for a high drag magnetic recording medium.

Conventionally, ferrite materials have been used for head cores for VTRs or magnetic disks. This is due to the high permeability and high wear resistance in the high frequency range of several MHz or more. However, in recent years, in order to improve the recording density, a high-constant magnetic recording medium by alloy powder, plating or deposition tends to be used. However, in the head core made of a conventional ferrite material, since the saturation magnetic flux density is low, the recording capability for a recording medium having a coercive force exceeding 1000 (Oe) is insufficient.

Therefore, a center head having a high saturation magnetic flux density, which has conventionally been used as a head of a broadcast VTR as a special use, has been reevaluated. However, wear is a problem for sender heads.

Therefore, it is considered to prevent the wear by filling the track part of the head to prevent abrasion, but in general, the glass used as a hard material has a weak adhesive strength with respect to the sender core to compensate for the defect. It is contemplated to interpose separate oxides, such as SiO ₂ , Al ₂ O ₃ , in the.

However, in the head having the above-described configuration, the hardness of each of the sender core, the intervening oxide, and the glass is different, and the wear of the magnetic tape may occur due to the contact of magnetic tape, which may cause problems for long-term use.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a magnetic head having sufficient recording and reproducing ability for the purpose of the high-magnetism recording medium, and having excellent abrasion resistance and reliability, no abrasion, and good frequency characteristics. .

Next, an embodiment of the present invention will be described with reference to the drawings.

1 shows an example of the magnetic head of the present invention. In the figure, reference numerals 1a and 2a are head core halves, all formed of an alloy magnetic material such as sender, and the magnetic core block is formed by a pair of head core halves 1a and 2a. Opposite rear parts of the head core halves 1a and 2a are joined by the silver solder 3. The nonmagnetic layer 4 forms a gap and has a considerable thickness in the head gap length. A pair of track width regulating grooves 5, 5 for regulating the head gap length are formed on the front surface of the head core half 1a, 2a, and the glass 6 is filled and bonded to the grooves. Herein, the glass 6 has a working temperature range of 500 ° C. or less. The working temperature range is the temperature range between the softening point and the temperature at which the feeder is about to drop when the glass is molded. The working temperature range of 500 ° C. or lower is extremely good for the sendust alloy, and sufficient adhesive strength is obtained. In addition, as shown in FIG. 6, the experiment shows that the regeneration output voltage and frequency characteristics are good when the working temperature range is 500 ° C or lower. On the other side of the head core half 1a, a V-shaped winding groove 7 having an inclined surface of about 45 ° C is formed, and the winding groove 8 paired with the winding groove 7 is a head core. Windings (not shown) are wound around the half bodies 1a and 2a, respectively.

2 to 4 show a method of manufacturing the head core of the magnetic head. According to this, first, as shown in FIG. 2 (a) and FIG. 2 (b), the winding grooves 7 and 8 are machined into the pair of magnetic blocks 1 and 2 made of the sender.

In addition, track-regulating grooves (5, 5) are subjected to a track working process by a hacksaw, a dicing machine, a slicing maching, or the like on both end faces perpendicular to the longitudinal direction of each of the magnetic blocks 1 and 2. ) And the track-processed surface is ground smoothly. Subsequently, as shown in FIG. 3 (a) and FIG. 3 (b), the nonmagnetic layer 4 having a substantial thickness is deposited on the surface of the magnetic blocks 1 and 2 at half the head gap length, respectively, by sputtering. After forming by means of such a method as shown in Fig. 4, the silver-lead foil 9 is inserted into the rear portion, and the non-magnetic layers 4 of the magnetic blocks 1 and 2 are opposed to each other. It is pressurized, heated to make it small, and the male surface of the magnetic blocks 1 and 2 is integrally fitted.

Next, the glass 6 to be melted at a temperature lower than the melting point of the silver lead foil is filled in the track width regulating grooves 5 and 5. As used above, the glass used herein has a working temperature range of 500 ° C. or lower.

As a result, the magnetic core block 10 is obtained. After polishing the gap formation surface (tape contact surface) of this block 10 circularly, a magnetic core block is obtained by a blade and a hacksaw according to the dashed-dotted line shown in FIG. Then, the wire is wound around the head core bodies 1a and 2a through the winding grooves 7 and 8.

As described above, according to the present invention, a pair of coban bodies having a track width regulating groove and a winding groove have a magnetic core block bonded to each other at a predetermined gap length, and the track width regulating groove has a sender core. It is designed to directly bond and fill glass with good adhesive strength without installing an intervening interlayer, so that the wear resistance of track part and gap part is sufficient, and it is a head which does not generate uneven wear, and it has high reliability to withstand stable long-term use. It is also to provide a head with good frequency characteristics.

Claims (1)

A core half formed of a pair of sender alloys (Fe-Si-Al alloys) having a track width regulating groove and a winding groove has a sender alloy magnetic core block bonded to each other with a predetermined gap length. The track regulation groove is filled with a glass having a working temperature range of 500 ° C. or less.

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