JPS6349846Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in magnetic heads. In order to densely record high-frequency signals such as video information on a medium with high coercive force such as metal tape, the magnetic core is made of an alloy magnetic material with a high saturation magnetic flux density, and the part facing the front gap is also made of glass material. A magnetic head has been devised in which a reinforcing core made of a material with excellent high frequency characteristics and low loss, such as ferrite, is attached to the other parts using an adhesive. In this case, an organic adhesive is applied to the opposing surfaces of the magnetic core and the reinforcing core to bond them together, but the adhesive does not penetrate the entire surface of each opposing surface, for example, as shown in Figure 1. As shown, only the four circumferential parts 2 of the reinforcing core 1 were joined, leaving an air layer 4 in the vicinity of the coil winding window 3. Therefore, another method was used in which the adhesive penetrated through the winding window, but this method was not very effective as the adhesive clumped together before it penetrated the entire surface of the opposing surface. If the above-mentioned air layer remains between the joint surfaces of both cores, the front gap of the magnetic core will open during the tape polishing process, which will be a major drawback in manufacturing magnetic heads with uniform characteristics at a high yield. was. The present invention aims to provide a magnetic head in which a magnetic core and a reinforcing core can be completely joined. That is, in the present invention, a groove is provided on the surface of the reinforcing core facing the magnetic core, reaching each side surface adjacent to the surface, and this groove acts as a guide for the penetration of adhesive during bonding, and at the same time, The object of the present invention is to provide a magnetic head which can act as an escape route for air between the facing surfaces of both cores, and which can join both cores together over the entire surface. Next, the present invention will be explained based on illustrated embodiments. Figure 2 shows a schematic perspective view of the configuration.
1 is a magnetic head core, and 11 and 12 are cores that reinforce this magnetic head core from its sides, and these are joined together with an adhesive (not shown). The magnetic head core 10 is constructed by joining a pair of core halves 13 and 14 made of a metal magnetic material such as sendust so as to have a coil winding window 15 in the middle. This joining is accomplished by providing a brazing material filling hole in the rear goat part and welding the brazing material filled therein. The reinforcing cores 11 and 12 are of a substantially equal configuration, and each reinforcing core is connected to the front gap 16 of the magnetic head core 10 , as shown in FIG.
The portion 17 facing the is made of a non-magnetic glass material, and the other portion 18 is made of a magnetic material with excellent high frequency characteristics and low loss, such as ferrite. The parts 17 and 18 are joined by a glass material. Each reinforcing core 11 , 12 is further provided with a winding window 19 communicating with the coil winding window 15 of the magnetic head core,
Further, grooves 20, 21 and 20', 21' are provided on the side surface of the magnetic head core that faces each magnetic path forming surface. Each groove is connected to the joint surface 22 of each reinforcing core as shown in the figure.
The grooves 20, 20' extend to the side surfaces 23, 24 adjacent to the coil winding window 1.
9. Next, reinforcing cores 11 and 1 are attached to the magnetic head core 10 .
The procedure for joining 2 will be explained. First, one reinforcing core 11 is placed with its joint surface facing up,
A magnetic head core 10 and another reinforcing core 12 are sequentially placed thereon with their joint surfaces facing down. Then, each core is positioned, and adhesive is injected into the grooves 20, 20' closer to the front gap from each side surface 23, 24. The injected adhesive penetrates deep using the grooves 20 and 20' as a guide, and also penetrates into the core 10 due to capillary action.
and 11 , and between 10 and 12 . During this infiltration process, the air between each core flows to the grooves 21 on the tape contact surface side and on the side farther from the front gear.
If the distance between the grooves is appropriate, it will not act to block the penetrating force of the adhesive. Therefore, the adhesive is spread throughout the space between the grooves 20, 20' on the front gear side and the grooves 21, 21', and the grooves 21, 21' of each core are filled with adhesive.
21' can be joined almost entirely on the front gear side. Next, when adhesive is injected into the grooves 21 and 21' from the respective side surfaces 23 and 24, the injected adhesive spreads between the cores in the direction opposite to the front gap of the groove in the same manner as described above.
As a result, the adhesive can be bonded entirely between the opposing surfaces of the reinforcing cores 11 and 12 and the magnetic head core 10 . As mentioned above, in the present invention, a groove is provided on the joining surface of the reinforcing core that is joined to the magnetic head core, extending to the side surface adjacent to this joining surface, and this groove is used to join both cores. The space between the cores can be filled almost entirely with adhesive, which makes it possible to obtain a magnetic head with high mechanical strength, which is practical.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional reinforcing core. Second
The figure is a schematic perspective view of an embodiment of the magnetic head of the present invention, and FIG. 3 is a perspective view of the reinforcing core of the present invention. Explanation of main drawing numbers, 10 magnetic head core, 11 ,
12... Reinforcement core, 20, 21... Groove, 15, 19
...Coil winding window.

Claims (1)

[Claims for Utility Model Registration] (1) In a magnetic head in which a magnetic head core and a core reinforcing the magnetic head are bonded together using an adhesive, the reinforcing core has a structure in which the reinforcing core is bonded to the magnetic core within the bonding surface thereof. A magnetic head characterized by having grooves extending to each adjacent side surface. (2) The magnetic head according to claim 1, wherein the groove communicates with a coil winding window provided in the reinforcing core. (3) The magnetic head core is made of an alloy magnetic material such as sendust.
Magnetic head as described in section.