JPH0194510A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the characteristics of the title magnetic head and to increase its equalization and durability by providing an elastic member to be press-contacted with a third core and a slider, to be held between them, to press-fit and fix the third core to first and second cores. CONSTITUTION:An elastic member 7 is provided which is press-fitted to third cores 13 and 23 and to a slider 6, held between them, and press-fits the third cores 13 and 23 to first and second cores 11, 21; 12 and 22. Consequently, the third cores 13 and 23 are press-fitted and fixed to the first and second cores 11, 21; 12 and 22 by the elastic member 7, and a gap does not exist at the joined part of the first and second cores 11, 21; 12 and 22. Thus, the various characteristics of the magnetic head can be improved and equalized, and since a secular change does not exist, the secular deterioration of the characteristics of the magnetic head due to the change can be prevented.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a magnetic head for magnetically recording, reproducing, or erasing information on a magnetic recording medium, and particularly relates to a first core around which a coil is wound; a magnetic circuit consisting of a second core joined to the first core through a magnetic gap; a third core fixed to the ends of the first and second cores; The present invention relates to a magnetic head having a slider which sandwiches and reinforces a core and slides into contact with a magnetic recording medium.

[Prior Art] As a magnetic head of this type, a magnetic head used in a floppy disk drive (hereinafter referred to as FDD) that records and reproduces information on a flexible magnetic disk of a magnetic recording medium, a so-called floppy disk, is known. . FIG. 10 shows a typical structure of a magnetic head element body composed of a magnetic circuit and a coil bobbin of a conventional magnetic head for FDD.

As shown in the figure, this magnetic head element main body 30 includes a first magnetic circuit 1 having a recording/reproducing gap G1 for recording and reproducing as a magnetic gap, and a second magnetic circuit having an erasing gab G2 for erasing. 2.

The first magnetic circuit 1 includes first to third cores 11 to 13 each made of a high permeability magnetic material.

The first core 11 is formed into a T-shape, and a coil bobbin 15 around which a coil 14 is wound is fitted. Also, the second core 1
2 is formed into a straight, elongated prismatic shape, and the first core 11
are butted and joined via a recording/reproducing gap G1. The third core 13 is formed into a short straight prismatic shape, and its both ends are pressed onto the rear ends of the first and second cores 11 and 12, respectively, and fixed by adhesive 27. , bridging the first and second cores 11.12 and magnetically coupling them.

On the other hand, the second magnetic circuit 2 similarly includes the first to third cores 21
It consists of ~23. A coil bobbin 25 wound with a coil 24 similar to the coil bobbin 15 is fitted into the T-shaped first core 21 . Further, the elongated prismatic second core 22 is joined to the first core 21 via the erase gap G2. Further, both ends of the short prismatic third core 23 are pressed onto the respective rear ends of the first and second cores 21 and 22, and fixed by adhesive 27.

Both magnetic circuits 1.2 are joined by butting their respective second cores 12.22 across the spacing plate 3 made of a non-magnetic material, and the recording/reproducing gap G1 and the erasing gap G2 are connected to the spacing plate 3 and the second core 1.2. They are configured to be adjacent to each other with the cores 12 and 22 in between.

The magnetic head element main body 30 is constructed as described above. As shown in FIGS. 11 and 12, a slider 5.6 formed in a block shape with an L-shaped cross section is attached to the first and second cores 11 of the magnetic head element main body 30.
, 12, 21 and 22 to form a magnetic head.

Note that the slider 5.6 is connected to the first and second cores 1 as described above.
1, 12, 21, and 22 for reinforcement, and also slides into contact with the floppy disk to stabilize the disk's sliding relative to the magnetic head.

Furthermore, this magnetic head is fixed by adhering the slider 5.6 to a support plate (not shown) that supports it.

Based on this structure, information is magnetically recorded or reproduced on a floppy disk (not shown) that slides in the direction of arrow A in FIG.

[Problems to be Solved by the Invention] In the above structure, the third core 13.23 is fixed by fixing both cores 13.23 to the first and second cores 11, 12.21.22, as described above. This is done by press-contacting the rear ends of each and adhering with an adhesive 27.

However, each of the third cores 13.23
It is extremely difficult to apply pressure uniformly to each of the cores 11, 12, 21, and 22 of the cores 11, 12, 21, and 22 to bond them in a state in which they are in pressure contact with each other without gaps, and requires a large number of man-hours. A gap was likely to occur between the third core and the first and second cores. li! If a gap occurs, magnetic flux leaks through the gap, and external noise is easily picked up, resulting in a decrease in magnetic efficiency and other adverse effects on various characteristics of the magnetic head element main body 30. And the magnetic head element main body 30
There was a problem in that various characteristics of the material deteriorated and variations occurred in the various characteristics.

Furthermore, since the characteristics of the adhesive 27 made of resin or the like change over time, there is also the problem that the characteristics of the magnetic head element main body deteriorate over time due to its negative effects.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, a first core around which a coil is wound, and a core connected to the first core through a magnetic gap are provided. a second core that is connected to the first and second cores;
A magnetic head having a magnetic circuit including a third core fixed to an end of the third core, and a slider sandwiching and reinforcing the first and second cores and slidingly contacting the magnetic recording medium. A structure is adopted in which an elastic member is provided in pressure contact with and held between the core and the slider to press and fix the third core to the first and second cores.

[Function] According to such a structure, the third core is fixed in pressure contact with the first and second cores by the above-mentioned elastic member, so that the first and second cores are fixed as in the case of conventional adhesion. There will be no gap at the joint with the core. Furthermore, since the fixed portion does not change over time unlike in the case of adhesive, the characteristics of the magnetic head do not deteriorate over time.

[Example] Hereinafter, details of an example of the present invention will be described with reference to FIGS. 1 to 9. Here, the above-mentioned magnetic head for FDI is used as an example, and parts in FIGS. 1 to 9 that are the same as or corresponding to those in FIGS. 10 to 12 of the conventional example are given the same reference numerals, and Explanations will be omitted or only briefly mentioned.

FIGS. 1 and 2 on the IL side are a perspective view and a sectional view illustrating the structure of an FDD magnetic head according to a first embodiment of the present invention.

The basic structure of the magnetic head of this embodiment, which consists of a magnetic head element main body 30 and a slider 5.6 shown in both figures, is the same as the conventional one. That is, the magnetic head element main body 30 is constructed in the same way as in the conventional example from a coil bobbin 15.25 around which the coils 14 and 24 of the two sets of first to third cores 11 to 13 and 21 to 23 are respectively wound. configured. Sliders 5.6 are joined and fixed to both sides of the first and second cores 11.12, 21.22.

As described above, the basic structure of the magnetic head of this embodiment is almost the same as that of the conventional magnetic head, but the fixing structure of the third core 13.degree. 23 is different from that of the conventional magnetic head. That is, the third core 13.23 is not fixed by adhesive, but is fixed by a leaf spring indicated by the reference numeral 7.
3.23 to the respective rear ends of the first and second cores 11.12, 21.22, the third core 13
．． 23 is fixed.

Here, the leaf spring 7 is formed into a rectangular plate shape bent into an M shape. The leaf spring 7 is press-fitted between the third core 13.23 and one of the sliders 6 facing it, and the leaf spring 7 is press-fitted between the third core 13.
．． By press-contacting and locking the plate spring 23 and the slider 6, the plate spring 7 is held by the elastic force of the plate spring 7 itself.

Although it is sufficient to hold it by this pressure welding, in addition, the leaf spring 7
By bonding the plate spring 7 to the slider 6, it is possible to reliably prevent the leaf spring 7 from falling off and improve reliability.

Next, a method of assembling the head of this embodiment having such a structure will be explained. First, sliders 5 are placed on both sides of two sets of first and second cores 11°, 12, 21.
．． Join 6. Next, each of the coil bobbins 15.25 around which each of the coils 14.15 is wound is inserted and fitted into each of the first cores 11.21. Next, each of the third cores 13.23 is inserted into the first and second cores 11°12
and 21.22, press fit the leaf spring 7 between the third core 13.23 and the slider 6, and use the leaf spring 7 to connect the third core 13.23 to the first. The second cores 11.12 and 21.22 are brought into pressure contact and fixed. Furthermore, the leaf spring 7 and the slider 6 are bonded together. In this way, the magnetic head of this embodiment is assembled.

According to the structure of the magnetic head of this embodiment as described above, the third core 13.23 is fixed in pressure contact with the first and second cores 11.12 and 21.22 by the leaf spring 7. Unlike conventional adhesives, there is no gap between the third core 13.23 and the first and second cores 11.12 to 21.22. Therefore, it is possible to avoid an adverse effect on various characteristics of the magnetic head due to the gap, and it is possible to improve various characteristics of the magnetic head and to make them uniform. Furthermore, according to the structure of this embodiment, the fixed portion of the third core 13.23 does not change over time unlike in the case of adhesive, so it is possible to prevent the characteristics of the magnetic head from deteriorating over time. .

Next, FIGS. 3 and 4 show an F according to a second embodiment of the present invention.
It shows the structure of a DD magnetic head.

As shown in both figures, in this embodiment, the third core 13.23 is connected to the first and second cores 1 in the same structure as the first embodiment.
1. ．． 12, 21.22 is provided between the third core 13.23 and one of the sliders 6, and another leaf spring 8 is provided between the first and second cores 11,
12, 21 and the other slider 5.

The leaf spring 8 is formed into a rectangular plate shape bent into an M shape, like the leaf spring 7, and has first and second cores 11 and 12.
．． It is press-fitted between 21 and 22 and the slider 5. The plate spring 8 is held by pressing and locking the side portions on both sides of the M-shape into the first and second cores and the slider 5, respectively, and connecting the first and second cores to the third core 13. Press to ゜23.

According to this structure, the pressure contact force between the first and second cores and the third core can be made larger than in the case of the first embodiment due to the spring force of both the leaf springs 7 and 8. Core first
And it can be fixed even more closely to the second core.

Kl! Next, FIGS. 5 and 6 show F according to the third embodiment of the present invention.
It shows the structure of a DD magnetic head.

In both figures, reference numeral 9 denotes a leaf spring for press-fitting the third core 13.23 to the first and second cores 11, 12, 21.22, and the plate spring of the first and second embodiments. spring 7,
The shape and structure are different from 8. That is, the leaf spring 9 is formed by bending both ends of a straight, elongated rectangular plate at right angles and then folding it back into the shape of a "<".

The leaf spring 9 then has the first and second cores 11°12.21.
The third core 13.degree. 23 which is brought into contact with 22 is pressed into the outside of the slider 5 and the third core in such a way that it is held from behind the slider 5 on the first and second core sides.

The leaf spring 9 is held in pressure contact with the third core 13.23 and the slider 5, so that the third core 13.23 is connected to the first and second cores.
The cores 11, 12, 21, and 22 are pressed and fixed.

The structure of this embodiment also provides the same effects as those of the first embodiment.

1 soil 13'' Next, FIGS. 7 to 9 show an FDD according to a fourth embodiment of the present invention.
This figure shows the structure of a magnetic head.

This embodiment differs from the first to third embodiments in that, as shown in FIG. The whole is integrated into a T-shape.

Further, a leaf spring for press-fitting and fixing the third core 13.23 is formed in a T-shape corresponding to the integrated third core 13.23, as shown by reference numeral 10 in the figure. In the leaf spring 10, the left and right middle parts of the horizontal sides and the middle parts of the vertical sides of the T-shape are each bent into the shape of a "<" character.

Further, as shown in FIGS. 7 and 8, ribs 5a and 6a are protruded from opposite positions in the middle part of the inside of the slider 5.degree.6, respectively.

Based on this structure, the second core 12.degree. 22 is brought into contact with the rib 5a of the slider 5, as shown in FIGS. 7 and 8. And the third core 13.2 integrated from above
3 is brought into contact with the first and second cores 11.12 and 21.22, with the vertical side portion of the T-shape overlapping the second core 12.22. Furthermore, a T-shaped leaf spring 10 is attached to the third core 1 from above.
The third core 13.23 is press-fitted between the rib 6a of the slider 6 so as to overlap in a T-shape of 3°23.

The leaf spring 10 is held in pressure contact with the third core 13.23 and the rib 6a, and the third core 13.23 is held in pressure contact with the first and second core 13.23.
Press and fix the cores 11, 12°21.22.

Even with such a structure, the same effects as those of each of the above-mentioned embodiments can be obtained.

Further, as described above, various structures of the leaf spring for press-fitting and fixing the third core and corresponding structures of the slider can be prepared, and are not particularly limited.

[Effects of the Invention] As is clear from the above description, according to the present invention, a first core around which a coil is wound, a second core joined to the first core through a magnetic gap. , a magnetic circuit consisting of a third core fixed to the ends of the first and second cores, and a slider that sandwiches and reinforces the first and second cores and slides into contact with the magnetic recording medium. The magnetic head employs a structure in which an elastic member is provided in pressure contact with the third core and the slider and held between them to press and fix the third core to the first and second cores. Therefore, the third core can be tightly fixed to the first and second cores without any gaps, and the fixed portions do not change over time, which improves and makes the characteristics of the magnetic head more uniform. The excellent effect of improving durability can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a magnetic head according to a first embodiment of the present invention, FIG. 2 is a sectional view of the same head, and FIG.
FIG. 4 is a perspective view showing the structure of the magnetic head according to the embodiment; FIG. 4 is a sectional view of the head; FIG. 5 is a perspective view of the magnetic head according to the third embodiment; FIG. 6 is a sectional view of the head; is the fourth
FIG. 8 is a sectional view of the magnetic head according to the embodiment, FIG. 9 is a perspective view of the third core and leaf spring in FIGS. 7 and 8, and FIG. 10 is a conventional magnetic head. A perspective view of the magnetic head element body of the head; FIG. 11 is a perspective view of the conventional head;
FIG. 12 is a sectional view of the head. 5.6... Slider 7-10... Leaf spring 11.
21...First core 12.22...Second core 13.23...Third core 14.24...Coil 15.25...Coil bobbin Fig. 2 jF%b2

Claims (1)

[Claims] A first core around which a coil is wound, a second core joined to the first core through a magnetic gap, and a third core fixed to the ends of the first and second cores. and a slider that sandwiches and reinforces the first and second cores and slides into contact with the magnetic recording medium,
A magnetic head characterized in that an elastic member is provided in pressure contact with the third core and the slider and held between them to press and fix the third core to the first and second cores. .