JPH02130709A - Magnetic head - Google Patents

Abstract

PURPOSE:To join and fix core half bodies of a magnetic head in a firmly adhered state by providing an elastic back bar fixing member which can be deformed when external force is applied to the member and joining and fixing a back bar to a head core for recording and reproduction and head core for erasure by using the back bar fixing member as a pressing member. CONSTITUTION:When external force is applied to a back bar fixing member 1 from both sides of the member 1 in the directions shown by the arrows A after a back bar 15 is inserted through a hole 1a provided in the member 1, the member 1 receives force in the direction shown by the arrow B and is deformed in the direction B. As a result, a gap 2 is formed between a center core 18 and the member 1 and the mounting position of the back bar 15 against the member 1 can be set easily. When the external force is removed thereafter, the member 1 returns to the original shape from the deformed state and the back bar 15, head core 11 for recording and reproduction, head core 12 for erasure, and the center core 18 come into close contact with each other and can be fixed to each other by the elastic force of the member 1. Therefore, the cores and back bar can be joined and fixed to each other in a firmly adhered state without making any temporary adhering process by using a temporary bonding agent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a back bar consisting of a square core that forms a closed magnetic path in the magnetic circuit of a magnetic head.

[Prior Art] FIG. 6 is a perspective view showing a conventional magnetic head used in a magnetic disk device, and FIG. 7 is a perspective view showing essential parts of the magnetic head shown in FIG. The magnetic head shown in FIG. 6 is viewed from the side opposite to the side in contact with the magnetic medium. In the figure, 11 is a recording/reproducing head core, 12 is an erasing head core, 13 is a recording/reproducing coil, 14 is an erasing coil, and 15 is bonded to the recording/reproducing head core 11 and the erasing head core 12 to close the magnetic circuit. A back bar consisting of a ■-shaped core made of magnetic material such as ferrite that forms a path, 16 is a gimbal spring for supporting the magnetic field, and 17 is a magnetic head and FDD (flexible disk drive).
A flexible printed circuit board 18 is a magnetic head cable interposed between the main body and the recording/reproducing head core 11.
This center core is shared by the erasing head core 12 and the erasing head core 12.

In order to form a closed magnetic path of the magnetic circuit in the conventional magnetic head, the back bar 15 is fixed to the recording/reproducing head core 11 and the erasing head core 12 using an adhesive.

[Problems to be Solved by the Invention] As described above, the back bar 15 for forming the closed magnetic path of the magnetic circuit in the conventional magnetic head is attached to the recording/reproducing head core 11 and the erasing head core 12 using an adhesive. Fixed with adhesive. That is, since the backper 15 is temporarily attached to the recording/reproducing head core 11 and the erasing head core 12 using a temporary adhesive, and then fixed using the actual adhesive, each core that becomes a component in this case is It is necessary to fix the adhesive from the outside using a jig (not shown), and therefore, the adhesive position may shift before the adhesive dries sufficiently, or when the fixation with the jig is released. Another problem was that each of the cores could break due to sticking to the jig.

This invention was made to solve the above-mentioned problems.Temporary bonding using temporary adhesive can omit the process, and can also be fixed with a higher degree of adhesion, creating a closed magnetic circuit with less loss. The purpose is to obtain a magnetic head that can be formed.

[Means for Solving the Problems] The magnetic head according to the second invention includes a back bar fixing member having an elastic force that deforms when an external force is applied, and a back bar for forming a closed magnetic path of a magnetic circuit. The back bar fixing member is used as a presser and is adhesively fixed to the recording/reproducing head core and the erasing head core.

[Function] In the magnetic head of the present invention, a back bar for forming a closed magnetic path of a magnetic circuit is adhesively fixed to a recording/reproducing head core and an erasing head core using an elastic back bar fixing member as a presser. This allows adhesive fixation with higher adhesion and formation of a closed magnetic path with less loss.

[Embodiment FIG. 1 shows a magnetic head which is an embodiment of the present invention.
FIG. 2 is a perspective view showing a main part of the backper held down by a back bar fixing member, and FIGS. 2 and 3 are a perspective view and a plan view showing the back bar fixing member in the magnetic head of FIG. In the figure, 11 is a recording/reproducing head core, 12 is an erasing head core, and 15 is an I-shaped core made of a magnetic material such as ferrite that is bonded to the recording/reproducing head core 11 and the erasing head core 12 to form a closed magnetic path of a magnetic circuit. A backper 18 consisting of the following is a center core that is shared by the recording/reproducing head core 11 and the erasing head core 12. In addition, l is a back bar fixing member provided according to the present invention and having an elastic force that deforms when an external force is applied;
In the embodiment shown in FIGS. 1 and 2, it is formed in a trapezoidal shape. 1a is a hole provided in the back bar fixing member 1, through which the back bar 15 is inserted.

4(a) and 4(b) are explanatory diagrams showing the operation of the back bar fixing member in the magnetic head of FIG. 1. FIG.

Next, the operation of the back bar fixing member in the magnetic head according to the embodiment of the present invention will be described. As shown in FIG. 1, insert the back par 15 into the hole la provided in the back bar fixing member l, and as shown in FIG. A
When an external force is applied in the direction indicated by the dotted line arrow B, the back bar fixing member 1 is deformed in the direction indicated by the solid line arrow C as shown in FIG. 4(b). Then, as shown in FIG. 4(b), a space (gap) 2 is created between the center core 18 and the back bar fixing member 1, so that the mounting position of the back par 15 with respect to the back bar fixing member 1 can be easily set. can. Thereafter, when the external force applied in the case shown in FIG. 4(a) is loosened and released, the deformation of the back bar fixing member 1 returns to its original state, and the elastic force of the back bar fixing member l causes the back par 15 to be Recording/playback head core 1
1. The erasing head core 12 and the center core 18 can be closely fixed. As a result, in the magnetic head according to the present invention, it is possible to omit the step of temporarily attaching each core with a temporary adhesive as in the conventional example of this type, and it is possible to realize adhesive fixation with higher adhesiveness.

In the above embodiment, the back bar fixing member 1 is provided with a hole la through which the back bar 15 can be inserted from the side, but other embodiments of the present invention as shown in FIG. In other words, the upper part of the back bar fixing member 1 is open-cut, and there are locking parts 3 at the left and right upper ends to prevent the back bar 15 from floating up and to further increase the degree of adhesion. It is also possible to adopt a structure in which the above-mentioned embodiment is provided, and the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, the magnetic head of the present invention includes a back bar fixing member having an elastic force that deforms when an external force is applied, and a back bar for forming a closed magnetic path of a magnetic circuit. Since the structure is constructed by adhesively fixing the recording/reproducing head core and the erasing head core using the back bar fixing member as a presser, the step of temporarily attaching each core with temporary adhesive as in this type of conventional example is omitted. This has the excellent effect of providing a magnetic head that can be adhesively fixed with a higher degree of adhesion and can form a closed magnetic path with less loss.

[Brief explanation of drawings]

FIG. 1 shows a magnetic head according to an embodiment of the invention.
2 and 3 are a perspective view and a plan view showing the back bar fixing member in the magnetic head of FIG. 1, and FIG. 4 ( a) and (b) are explanatory diagrams showing the operation of the back bar fixing member in the magnetic head of FIG. 1, FIG. 5 is a perspective view showing the back bar fixing member according to another embodiment of the present invention, and FIG. FIG. 7 is a perspective view showing a conventional magnetic head used in a magnetic disk drive, and FIG. 7 is a perspective view showing essential parts of the magnetic head shown in FIG. In the figure, 1... back bar fixing member, 1a...
Hole, 2... Space (gap), 3... Locking part, 11
...Head core for recording/reproduction, 12... Head core for erasing, 13... Coil for recording/reproduction, 14... Coil for erasing, 15... Back par 16... Gimbal spring, 17... Flexible Printed circuit board, 18...
It is a center core. In addition, the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] An I bonded to a recording/reproducing head core and an erasing head core constituting a magnetic circuit of a magnetic head to form a closed magnetic path.
A back bar consisting of a molded core is provided with a back bar fixing member having elasticity that deforms when an external force is applied, and using this back bar fixing member as a presser, the back bar is attached to the recording/reproducing head core and the erasing head core. A magnetic head characterized in that it is configured by being adhesively fixed to.