JPS599402Y2 - magnetic head - Google Patents

Description

[Detailed description of the invention] This invention is a magnetic head in which a magnetic core inserted into a case is filled and fixed with a resin with its tip gap exposed through a window hole on the front of the case. Regarding improvements.

Needless to say, in this type of magnetic head, the above-mentioned resin is also exposed on the tape sliding surface, that is, on the window hole of the case, but since this resin is a different substance from the so-called metal of the core and case, there is a gap between the two. There are inevitably differences in temperature expansion rate and wear rate, which can cause unevenness on the tape sliding surface and cause scratches on the tape.Also, since the resin becomes hot during filling, the temperature of the core changes and its properties deteriorate. Sometimes.

Therefore, the basic idea of this invention is to avoid using synthetic resin, which has the above-mentioned disadvantages, at least in the tape sliding contact area, and to use a metal material that solidifies at room temperature, as well as the core and case, instead of the conventional material. It is about eradicating shortcomings.

The details of the embodiment will be described below with reference to the drawings.

Reference numeral 1 denotes a case, into which a magnetic core 3 is inserted via a core holder 2, and a gap portion, that is, a tip portion 3' of the core 3 is inserted into a window hole 4 of the case, and the magnetic core 3 is inserted into the case 1 through a core holder 2. In a magnetic head of the type in which the core 3 is bonded together with the holder 2 or filled and fixed in a case with resin 5, the core 3 is solidified at room temperature between at least the area around the tip core portion 3' that intervenes in the window hole 4 and the case where it faces. Non-magnetic metal substance 6
It is filled with

Therefore, the non-magnetic metal substance mentioned in this example is amalgam.

This amalgam refers to a mercury alloy, and in this invention 60% silver
, an alloy of 25% tin and 15% copper, and mercury are stirred at room temperature in an approximately 1:1 ratio, and solidifies in about 8 minutes when placed at room temperature.

It should be noted that the above-mentioned alloy is merely an example, and the metal that can be combined with mercury is not particularly limited.

As described above, the present invention fills the space between the case and the area around at least the tip core portion of the magnetic core inserted into the window hole with a substance that dries up at room temperature. In other words, no heat is applied to the tape sliding surface.
Therefore, deterioration of core characteristics due to heat will not occur.

In addition, since the above-mentioned material is a metallic material like the core and the case, in other words, the tape sliding contact surface is all metallic, so there is a small difference in temperature expansion rate and wear rate depending on the material, so unevenness occurs on the tape sliding contact surface. This has great practical effects, such as eliminating the risk of scratches on the tape.

[Brief explanation of drawings]

The figure is a partially cutaway plan view. 1...Case, 3'...Tip core portion, 4...Window hole, 6...Nonmagnetic metal material.

Claims (1)

[Scope of utility model registration request] In a magnetic head of a type in which a magnetic core is inserted into a case and its tip core portion is inserted into a front window hole of the case and then filled and fixed with a resin or the like, at least the tip core portion inserted into the window hole is fixed. A magnetic head characterized in that a non-magnetic metal substance that solidifies at room temperature is filled between the circumference and the case.