JP3240550B2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a magnetic recording device such as a floppy disk device for recording and reproducing signals on a magnetic recording medium.

[0002]

2. Description of the Related Art FIGS. 3 to 5 show an example of a magnetic head 1 used in a floppy disk drive. In FIG. 3, recording surfaces are provided on both surfaces (hereinafter, referred to as upper surface and lower surface for convenience) 2a and 2b of the magnetic recording medium 2, and magnetic recording is performed corresponding to the two upper and lower recording surfaces. Two magnetic heads 1 and 1 are provided to face each other with the medium 2 interposed therebetween.

As shown in FIGS. 4 and 5, a magnetic head 1 has a substantially plate-shaped slider 3 sliding on a magnetic recording medium 2 and a magnetic head core 4 inserted into a long hole 3a of the slider 3. A recording / reproducing coil 5 and an erasing coil 6 (hereinafter, referred to as an assembly including the slider 3, the magnetic head core 4, the recording / reproducing coil 5, and the erasing coil 6 are attached to a leg portion (described later) of the magnetic head core 4; , A magnetic head assembly 7 for the sake of convenience) and a shield member arranged to surround the magnetic head assembly 7 to prevent the influence of an external magnetic field on the magnetic head 1, the recording / reproducing coil 5 and the erasing coil 6. 8, the magnetic head assembly 7 and the shield member 8 are slidably mounted on the magnetic head core 4 and the magnetic recording medium 2.
And a flexure body 9 that slides following.

The slider 3 includes two rails (hereinafter, referred to as first and second rails) 10 and 11 extending along the running direction of the magnetic recording medium 2 and first and second rails 10. , 11 are formed between the first and second rails 10, 11 so as to have a lower level than that of the first and second rails 10, 11.
2 to improve contact with the magnetic recording medium 2 and reduce spacing loss. A substantially rectangular long hole 3a is formed in the first rail 10, and the magnetic head core 4 is inserted into the long hole 3a.

[0005] As shown in FIG.
First and second cores 13 and 14 having a substantially L-shape;
A center core 1 interposed between the first and second cores 13 and 14 so as to form a substantially E-shape with the second cores 13 and 14;
5 is provided. The recording / reproducing coil 5 is attached to a leg 13a of the first core 13 facing the center side core 15.
Is installed. Further, the erasing coil 6 is mounted on the leg 14 a of the second core 14 facing the center core 15.

The leg 13a, the leg 14a and the central core 1
5, a floor plate 16 to be described later of the shield member 8 is joined, whereby the first core 13-floor plate 16-closed magnetic path of the center side core 15, the second core 14-floor plate 16 -A closed magnetic path of the center side core 15 is formed.

Further, as shown in FIG. 5, a side 13b perpendicular to the leg 13a of the first core 13 and a side 14b perpendicular to the leg 14a of the second core 14 face the magnetic recording medium 2. , The magnetic head core 4 is the slot 3 of the slider 3
a. Then, the side 1 of the first core 13
A recording / reproducing gap 17 for recording / reproducing a signal is formed at a joint between the center core 3 and the center core 15, and a guard band is formed at a joint between the side part 14 b of the second core 14 and the center core 15. Is formed.

Since the floppy disk device is used by being incorporated in a device such as a personal computer, an external magnetic field from a switching power supply, a CRT, or the like affects the magnetic head core 4 to easily cause a signal reading error. But
In order to prevent such a reading error from occurring, the shield member 8 is provided. The shield member 8 is made of a magnetic material such as ferrite or permalloy, and is disposed on the outer periphery of the magnetic head assembly 7.

As shown in FIG. 5, the shield member 8 is formed so as to close a substantially rectangular annular ring portion 19 and an opening on one side of the ring portion 19, and the leg portions 13a, 14a and A floor plate 16 to which the central core 15 is joined;
Window 2 formed above opposing sides of ring 19
0 so that the lead wires 5 a and 6 a of the recording / reproducing coil 5 and the erasing coil 6 can be drawn out from the window 20.

The flexure body 9 is formed of a thin metal plate. As shown in FIG. 4, a substantially rectangular mounting plate 21 on which the magnetic head core 4 and the shield member 8 are mounted, and a mounting plate 2
1 is roughly constituted by a substrate 23 which is swingably supported via two bridge portions (hereinafter, referred to as first bridge portions) 22 interposed between the mounting plate 21 and the mounting plate 21. Substrate 2
Reference numeral 3 denotes a substantially rectangular annular support 24 and a substantially U-shaped substrate main body 2 arranged so as to surround half of the support 24.
5 and two bridges (hereinafter, referred to as second bridge portions) 26 interposed between an end portion of the substrate main body 25 and the support 24, and the substrate main body 25 is supported. The body 24 is swingably supported via two second bridge portions 26. In this case, the first bridge portion 22 and the second bridge portion 26 are arranged so as to have a positional relationship orthogonal to each other, and the support 24 is
And the mounting plate 21 can swing about the first bridge portion 22 in the Y direction orthogonal to the X direction. ing. The magnetic head assembly 7 and the shield member 8 mounted on the mounting plate 21 are joined to the mounting plate 21 (flexure body 9) with an adhesive S such as epoxy. The lead wires 5a and 6a of the recording / reproducing coil 5 and the erasing coil 6 are drawn out of the window 20, as described above, and are provided on a back surface of the second support 24 (not shown). FPC).

The pair of magnetic heads 1 and 1 are arranged so as to sandwich the magnetic recording medium 2 as shown in FIG. In this case, the pair of magnetic heads 1 and 1 are such that the first and second rails 10 and 11 of one magnetic head 1 face the second and first rails 11 and 10 of the other magnetic head 1, respectively. In order to prevent interference between the pair of magnetic heads 1 and 1.

[0012]

By the way, in recent years, floppy disk devices have been reduced in size and thickness, and accordingly, a magnetic head 1 used in floppy disk devices has been developed.
Are also becoming smaller and thinner. In order to reduce the size and thickness of the magnetic head 1, the flexure body 9 is also downsized, and the mounting plate 21 of the flexure body 9 is reduced. Therefore, the shield member 8 and the first bridge portion 22
Are relatively close to each other, and the adhesive S may flow into the first bridge portion 22 during the bonding operation between the shield member 8 and the flexure body 9. And
When the adhesive S flowing out to the first bridge portion 22 is hardened, the flexibility of the first bridge portion 22 is lost, and accordingly, the magnetic recording medium 2 and the magnetic head 1 are removed.
In this case, there is a possibility that the sliding followability of the slider 3 with the slider 3 is impaired, a large spacing loss occurs, the reproduced signal is reduced, and a reading error is caused.

The present invention has been made in view of the above circumstances, and provides a magnetic head capable of suppressing adhesion of an adhesive to unnecessary portions on a flexure body and securing good flexibility of the flexure body. The purpose is to:

[0014]

According to the present invention, there is provided a magnetic head core for recording / reproducing a signal on / from a magnetic recording medium, a recording / reproducing coil mounted on the magnetic head core, and surrounding the recording / reproducing coil and the magnetic head core. And a flexure body that slidably mounts the magnetic head core and the shield member so that the magnetic head core slides and follows the magnetic recording medium. A mounting plate for mounting the magnetic head core and the shield member, and a substrate that swingably supports the mounting plate via a bridge portion interposed between the mounting plate and the mounting plate, The shield member is bonded to the mounting plate with an adhesive, and a cutout portion is formed in a portion facing the bridge portion on a bonding surface side portion of the shield member. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic head 1 according to an embodiment of the present invention will be described below with reference to FIGS. In addition,
Illustration and description of members and portions equivalent to those shown in FIGS. 3 to 5 will be omitted as appropriate.

The magnetic head 1 is different from the magnetic head 1 shown in FIGS. 3 to 5 in that a notch (recess) 27 is formed in the shield member 8 as shown in FIGS. . That is, as shown in FIGS. 1 and 2, sides 19 a, 19 a facing the pair of first bridges 22, 23 in the ring 19 and a side 1 in the floor plate 16.
Notches 27, 27 are formed at portions connected to 9a, 19a so as to face the pair of first bridge portions 22, 22, respectively. The notches 27, 27 are formed to be shallow, and the walls 8a, 8
a is left. The shield member 8 is obtained by powder molding or press molding of Mn-Zn ferrite or a permalloy material. The notch 27 is prepared in advance by using a mold (not shown) for forming the notch 27, and is formed using this mold when the shield member 8 is formed.

In the magnetic head 1, when the shield member 8 is bonded to the mounting plate 21 with the adhesive S, the shield member 8
Of the adhesive S applied between the mounting plate 21 and the mounting plate 21 can be made to flow into the notch 27. Therefore, it is possible to prevent the adhesive S from flowing out to the first bridge portions 22. Then, by preventing the adhesive S from flowing out to the first bridge portion 22,
The flexibility of the first bridge portion 22 is maintained, so that the sliding followability between the magnetic recording medium 2 and the slider 3 is ensured, so that a good reproduction signal can be obtained, and further, a reading error occurs. Can be prevented.

The notches 27, leaving the walls 8a, 8a
Since 27 is formed, reduction in the shielding effect of the shielding member 8 is suppressed, and good shielding properties can be maintained.
In other words, when the cutouts 27, 27 are formed by completely cutting out without leaving the walls 8a, 8a, the shielding effect is deteriorated, but such a deterioration of the shielding effect is not caused.

Further, a mold for forming the notch 27 is prepared in advance, and the notch 27 is formed using this mold when the shield member 8 is formed.
Can be formed relatively easily.

[0020]

According to the present invention, when the shield member is bonded to the mounting plate with an adhesive, an excess of the adhesive applied between the shield member and the mounting plate can be wrapped around the notch. As a result, it is possible to prevent the adhesive from flowing out to the bridge portion. For this reason, by preventing the adhesive from flowing out to the bridge portion, the flexibility of the bridge portion is maintained, and as a result, the sliding followability between the magnetic recording medium and the slider is ensured, and good reproduction is achieved. A signal can be obtained, and the occurrence of a reading error can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a magnetic head according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the magnetic head of FIG.

FIG. 3 is a cross-sectional view illustrating an example of a conventional magnetic head.

FIG. 4 is a perspective view showing one of the magnetic heads shown in FIG. 3;

FIG. 5 is an exploded perspective view showing the magnetic head of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head 2 Magnetic recording medium 4 Magnetic head core 5 Recording / reproducing coil 8 Shield member 9 Flexure body 16 Shield member floor plate 19 Shield member ring 21 Mounting plate 27 Notch S Adhesive

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-6-251490 (JP, A) JP-A-5-234233 (JP, A) JP-A-5-15156 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G11B 5/60 G11B 5/265 G11B 5/10 G11B 17/32

Claims (1)

(57) [Claims] 1. A magnetic head core for recording and reproducing signals on a magnetic recording medium, a recording / reproducing coil mounted on the magnetic head core, and a shield member arranged to surround the recording / reproducing coil and the magnetic head core. And a flexure body that slidably mounts the magnetic head core and the shield member and slides the magnetic head core on the magnetic recording medium. The flexure body includes the magnetic head core and the shield member. And a substrate that swingably supports the mounting plate via a bridge portion interposed between the mounting plate and the mounting plate, wherein the shield member is mounted on the mounting plate. A magnetic head device, wherein a notch is formed in a portion of the shield member facing the bridge portion on a bonding surface side portion of the shield member.