JPH0368445B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a magnetic head, and particularly to improving its wear resistance.

[Conventional technology]

4 and 5 are diagrams showing a conventional magnetic head. In the figures, 1 is a main core made of a magnetic material such as sendust, and has a magnetic gap 2 and a winding window 3. Reference numeral 4 denotes an auxiliary core for reinforcing the main core 1, which includes a magnetic part 4a having a winding window 5 and made of ferrite or the like, and a non-magnetic part 4b fixed to the tip side of the magnetic part 4a and made of glass or the like.
It consists of. The auxiliary core 4 is bonded to both sides of the main core 1 with an adhesive, and a coil (not shown) is wound around the winding windows 3, 5, 5 passing through the auxiliary core 4.

As shown in FIG. 5, this magnetic head contacts the recording medium 6 to perform recording and reproduction.

[Problem that the invention aims to solve]

In the conventional magnetic head as described above, the main core 1
Since the main core 1 is constantly in contact with the recording medium 6 for recording and reproduction, there is a problem that as the main core 1 wears out, the magnetic gap 2 wears out, making it impossible to perform recording and reproduction. Further, as the main core 1 and the non-magnetic portion 4b of the auxiliary core 4 wear out, the adhesive between them is exposed and adheres to the magnetic gap 2, resulting in a decrease in electrical characteristics.

This invention was made to solve these problems, and is advantageous because it can prevent the magnetic gap of the main core from wearing out by contacting the recording medium with an abrasion-resistant film, and also prevents the adhesive from being exposed. The purpose of this invention is to provide a magnetic head that has good electrical characteristics and high reliability.

[Means for solving problems]

In the magnetic head according to the present invention, a wear-resistant film having a harder hardness than that of the main core is provided at least at the tip portion between the main core and the auxiliary core, and the bonding is performed at a portion without this wear-resistant film. It is something.

[Operation] In the present invention, since the wear-resistant film comes into contact with the recording medium, an appropriate spacing is maintained between the magnetic gap and the recording medium, thereby preventing the magnetic gap from being worn out. Further, since the adhesive is not present in the wear-resistant film, the adhesive is not exposed and adhesion of the adhesive to the magnetic gap is prevented.

〔Example〕

1 to 3 are diagrams showing one embodiment of the present invention, and numerals 1 to 6 are exactly the same as the conventional magnetic head described above. Reference numeral 7 denotes a wear-resistant film formed on the auxiliary core 4 by vapor-depositing a material harder than the main core 1, such as titanium, onto the auxiliary core 4, and is provided on the tip and base ends of the auxiliary core 4. . Auxiliary core 4
is joined to the main core 1 by an adhesive filled in a space 8 between the main core 1 and the portion without the wear-resistant film 7.

As shown in FIG. 3, as the magnetic head wears out, the non-magnetic portions 4 of the main core 1 and the auxiliary core 4
b is worn out, and the wear-resistant film 7 protrudes. Therefore, the recording medium 6 comes into contact only with the wear-resistant film 7, and an appropriate spacing is maintained between the magnetic gap 2 of the main core 1 and the recording medium 6, thereby preventing the magnetic gap 2 from being worn out. Furthermore, since there is no adhesive in the wear-resistant film 7, the adhesive will not be exposed even if the main core 1 and the auxiliary core 4 are worn.

Although titanium was shown as the material for the wear-resistant film 7 in the above embodiment, other materials, such as quartz, may be used as long as the material is harder than the main core 1. Also, this titanium was vapor-deposited on the auxiliary core 4, but the auxiliary core 4
If a film is formed by coating on top of
For example, sputtering or ion plating may be used. Furthermore, although the wear-resistant film 7 is deposited on the auxiliary core 4, it may be deposited on the main core 1.

Further, in the above embodiment, the wear-resistant film 7 is attached to the auxiliary core 4.
Although the abrasion-resistant film 7 is shown as being provided on the distal end portion and the proximal end portion of the recording medium 6, it is sufficient to provide the wear-resistant film 7 only on the distal end portion that contacts the recording medium 6.

〔Effect of the invention〕

As explained above, this invention uses a wear-resistant film that comes into contact with the recording medium, so the magnetic gap of the main core does not wear out, and the adhesive is not exposed, resulting in good electrical characteristics and high reliability. effective.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is an exploded view of Fig. 1, Fig. 3 is a usage state diagram, Fig. 4 is a perspective view showing a conventional one, and Fig. 5 is an exploded view of Fig. 1. It is a usage state diagram. In the figure, 1 is the main core, 2 is the magnetic gap, and 3 is the main core.
4 is a winding window, 4 is an auxiliary core, 4a is a magnetic part, 4b is a non-magnetic part, 5 is a winding window, 6 is a recording medium, and 7 is a wear-resistant film. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A main core comprising a magnetic main core having a magnetic gap and a winding window, a magnetic part having the winding window, and a non-magnetic part fixed to the tip side of the magnetic part; In a magnetic head comprising auxiliary cores bonded to both sides of the core with an adhesive, a wear-resistant film having a harder hardness than that of the main core is provided at least at a tip portion between the main core and the auxiliary core. . A magnetic head characterized in that the bonding is performed in a portion where the wear-resistant film is not present. 2. The magnetic head according to claim 1, wherein the wear-resistant film is formed by depositing titanium on the auxiliary core.