JP4039172B2 - Magnetic head device and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic head device for recording / reproducing magnetic signals on / from a magnetic recording medium such as a magnetic disk and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, a magnetic head is mounted on a recording / reproducing apparatus that performs recording / reproducing on a magnetic recording medium. When recording data using a recording / reproducing apparatus, an external magnetic field corresponding to the recording data is applied to the magnetic recording medium by a magnetic head, thereby manipulating the magnetic polarity in a specific minute area on the magnetic recording medium. A recording mark is formed. When data is reproduced, the magnetic polarity of the recording mark formed on the magnetic recording medium is detected by a magnetic head and converted into an electric signal, and the recorded data is read as an electric signal.
[0003]
Here, a magnetic head 100 shown in FIG. 3 will be described as an example of a conventional magnetic head. The magnetic head 100 is mounted on a recording / reproducing apparatus that performs recording / reproducing on a magnetic disk, that is, a so-called flexible disk drive (hereinafter referred to as an FD drive).
[0004]
As shown in FIG. 3, the magnetic head 100 includes a magnetic core 101 that records and reproduces magnetic signals on and from a magnetic disk, and a pair of sliders 102 and 103 bonded to both sides of the magnetic core 101. The slider member 104 is provided. The slider member 104 has the magnetic core 101 inserted into the shield member 107 and is bonded and fixed to the shield member 107 on both sides (sliders 102 and 103).
The magnetic head 100 also includes a pair of coil bobbins 105 and 106 mounted on the slider member 104 and a ring-shaped shield member 107 that encloses the coil bobbins 105 and 106.
[0005]
The coil bobbins 105 and 106 are made of, for example, a non-magnetic material such as a plastic material, and a coil is wound around each of them. Further, each of the coil bobbins 105 and 106 is inserted through a pair of legs formed on the magnetic core 101, and is held by the slider member 104 by a stopper (not shown). The shield member 107 is formed of a magnetic material such as permalloy or ferrite, for example, and is provided for the purpose of blocking external noise.
[0006]
The magnetic head 100 also includes a plurality of terminal pins 108 connected to coils wound around the coil bobbins 105 and 106, and a resin-made pin fixing member 109 that fixes the terminal pins 108.
[0007]
The magnetic head 100 configured as described above is fixed to a metal plate (gimbal) having a predetermined elasticity, and is attached to the head arm of the FD drive via this gimbal.
[0008]
[Problems to be solved by the invention]
By the way, in the conventional magnetic head 100, the slider member 104, the coil bobbins 105 and 106, and the shield member 107 are integrally formed. However, when an external impact is applied, for example, by dropping the FD drive. A large force is locally applied to the ferrite shield member 107, the ceramic sliders 102 and 103, or the magnetic core 101, and the coil bobbins 105 and 106 are attached, and the sliders 102 and 103 alone adhere to the shield member 107. There is a possibility that the fixed slider member 104 may be damaged.
[0009]
If the slider member is damaged, not only the recording / reproducing characteristics are remarkably impaired, but also a problem that normal recording / reproducing operation becomes impossible in some cases occurs.
[0010]
In order to solve this problem, for example, a measure has been proposed in which impact resistance is improved by injecting resin into the gap between the coil bobbins 105 and 106 and the shield member 107 and bonding and fixing to the shield member. In some cases, the injected resin contracts during curing, which may cause breakage of the coil or deformation of the sliding surface.
[0011]
Accordingly, the present invention has been made in view of the above-described conventional situation, and a magnetic head device capable of greatly improving impact resistance and preventing disconnection of a coil and deformation of a sliding surface. It aims at providing the manufacturing method.
[0012]
[Means for Solving the Problems]
A magnetic head device according to a first aspect of the present invention includes a slider member in which a slider is bonded to both sides of a magnetic core, a coil bobbin that is mounted on the slider member and wound with a coil, and includes the coil bobbin. And a resin material that fixes the slider member, the coil bobbin, and the shield member between the outer peripheral wall portion of the slider member and the medium-side main surface of the coil bobbin and the shield member. It is characterized by that.
[0013]
According to a fifth aspect of the present invention, there is provided a magnetic head device manufacturing method comprising: a slider member having a slider bonded to both sides of a magnetic core; a coil bobbin having a coil wound thereon; and a shield containing the coil bobbin. In the manufacturing method of the magnetic head device to which the member is mounted, the slider member, the coil bobbin, and the shield member are fixed between the outer peripheral wall portion of the slider member and the medium side main surface of the coil bobbin and the shield member. A resin material to be applied is applied.
[0014]
In the present invention configured as described above, the resin material is applied between the outer peripheral wall portion of the slider member and the coil bobbin and the shield member, and the respective portions are connected and fixed by the resin material. Bonding and integration can be achieved with strength, and mechanical impact resistance can be improved. Further, since the resin material does not flow into the gap between the coil bobbin and the shield member, the coil is not disconnected or the sliding surface is not deformed by shrinkage during curing.
[0015]
In the present invention, the range in which the resin material is applied is arbitrary as long as the bonding strength between the respective parts can be sufficiently ensured, but it is preferable to apply over the entire circumference of the outer peripheral wall portion of the slider member. . Thereby, the joining strength of each part by a resin material can be ensured to the maximum, and an impact resistance characteristic can be improved significantly.
[0016]
Further, the resin material used in the present invention is not particularly limited to the material or composition, but it does not flow into the gap between the coil bobbin and the shield member before curing, and does not impair workability during application. It is desirable to have a viscosity. By using a resin material having such a viscosity, it is possible to reliably prevent the resin material from flowing into the gap between the coil bobbin and the shield member at the time of application, and to improve the work efficiency of the application process. Can do.
[0017]
Further, as the resin material, it is desirable to use a resin material in which filler is mixed in a weight ratio of 10:10 or more and 10:40 or less. When the weight ratio of the filler to the resin substrate is less than 10:10, the viscosity decreases and flows into the gap between the coil bobbin and the shield member. When the weight ratio exceeds 10:40, the viscosity increases, There is a risk that the working efficiency is lowered and the adhesive force is lowered. Examples of the filler mixed in the resin base material include silica powder.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, a magnetic head device 10 as shown in FIGS. 1 and 2 will be described as an example of the configuration of the present invention. FIG. 1 is a schematic perspective view showing a part of the magnetic head device 10 cut away, and FIG. 2 is a cross-sectional view of the magnetic head device 10 as viewed from the side.
[0019]
As shown in FIGS. 1 and 2, the magnetic head device 10 includes a magnetic core 11 that records and reproduces magnetic signals to and from a magnetic disk, and a pair of sliders 12 and 13 joined to both sides of the magnetic core 11. The slider member 14 comprised by these is provided. The slider member 14 has the magnetic core 11 inserted into the shield member 18 and is bonded and fixed to the shield member 18 on both sides (sliders 12 and 13).
The magnetic head device 10 also includes a pair of coil bobbins 16 and 17 around which coils 15 are wound, and a ring-shaped shield member 18 that encloses the coil bobbins 16 and 17. The coil bobbins 16 and 17 and the shield member are provided. The slider member 14 is mounted on the main surface constituted by the members 18 and 18.
[0020]
The magnetic core 11 is made of a magnetic material having a sufficient saturation magnetic flux density, and constitutes a magnetic path. Further, the magnetic core 11 has a magnetic gap formed of a nonmagnetic material such as a glass material on the surface that slides with the magnetic disk. The sliders 12 and 13 are formed in a flat plate shape from a nonmagnetic material such as a ceramic material, and are joined to both sides of the magnetic core 11.
[0021]
In the magnetic head device 10, the slider member 14 constituted by the magnetic core 11 and the sliders 12 and 13 performs recording and reproduction while sliding on the magnetic disk on the surface on the side where the magnetic gap is formed. The sliders 12 and 13 are formed with grooves for the purpose of controlling the sliding state with the magnetic disk.
[0022]
The coil bobbins 16 and 17 are formed in a substantially cylindrical shape by nonmagnetic nonconductive materials such as various plastic materials, for example, and the leg portions of the magnetic core 11 are inserted into the centers of the holes, and a slider member is formed by a stopper (not shown). 14 is held. The coil bobbins 16 and 17 are integrally formed with a terminal pin holding portion 20 for holding a terminal pin 19 connected to the coil 15 on the side opposite to the side on which the slider member 14 is mounted.
[0023]
In the magnetic head device 10, a magnetic field is generated in the coil 15 by applying a current to the coil 15 via the terminal pin 19, and a leakage magnetic field is generated from the magnetic gap via the magnetic core 11 and applied to the magnetic disk. Thus, the magnetic signal is recorded. Further, when reproducing a magnetic signal recorded on the magnetic disk, the magnetic field recorded on the magnetic disk is taken into the magnetic core 11 from the magnetic gap, and the change in the magnetic field is converted into an electric current by the coil 15 to be converted into a terminal pin 19. As an electrical signal.
[0024]
The shield member 18 is formed in a ring shape from a magnetic material such as permalloy or ferrite, for example, and has a function of blocking the magnetic core 11 and the coil 15 disposed inside from magnetic field noise from the outside. 1 and 2 show an example in which the shield member 18 has a structure in which a plurality of plate-like members are stacked. However, by using such a structure, an eddy current due to a change in the external magnetic field is shown. Generation of noise can be suppressed, and noise blocking characteristics can be improved.
[0025]
By the way, the magnetic head device 10 is configured by the outer peripheral wall portion of the slider member 14, the coil bobbins 16, 17, and the shield member 18 in a state where the slider member 14, the coil bobbins 16, 17, and the shield member 18 are integrally mounted. A resin material 21 is applied between the main surface of the magnetic disk and the joined state of each part is reinforced by the resin material 21. For this reason, these parts (for example, the slider member 14 and the coil bobbins 16 and 17 or the coil bobbins 16 and 17 and the shield member 18) are securely fixed, and are joined and integrated with sufficient strength.
[0026]
Therefore, even when the magnetic head device 10 is mounted on various recording / reproducing devices, such as when the recording / reproducing device is dropped, and a large impact is applied from the outside, the slider member 14 and other parts are It is possible to prevent the parts from being damaged by an impact without applying a large force due to a collision.
[0027]
In the magnetic head device 10, the resin material 21 is applied only between the outer peripheral wall portion of the slider member 14 and the main surface on the magnetic disk side constituted by the coil bobbins 16, 17 and the shield member 18. The gap between 16, 17 and the shield member 18 is not filled. For this reason, the coil 15 is not disconnected or the sliding surface is not deformed due to shrinkage or the like occurring when the resin material 21 is cured, and the high-quality magnetic head device 10 can be manufactured with high yield.
[0028]
1 shows an example in which the resin material 21 is applied only to both side portions of the slider member 14 in the outer peripheral wall portion of the slider member 14, but sufficient bonding strength between the respective portions is ensured. If possible, the range in which the resin material 21 is applied is arbitrary. For example, the resin material 21 may be applied to only a part of the outer peripheral wall portion of the slider member 14. However, it is desirable to apply over the entire circumference of the outer peripheral wall portion of the slider member 14, whereby the bonding strength between the portions by the resin material 21 can be ensured to the maximum, and the impact resistance characteristics are greatly improved. be able to.
[0029]
Further, the resin material 21 is not particularly limited to its material and composition, but does not flow into the gap between the coil bobbins 16 and 17 and the shield member 18 before curing, and does not impair workability during application. It is desirable to have a viscosity of By using a resin material having such a viscosity, it is possible to reliably prevent the resin material from flowing into the gap between the coil bobbin and the shield member at the time of application, and to improve the work efficiency of the application process. Can do.
[0030]
Further, as the resin material 21, it is desirable to use a material in which a filler is mixed in a weight ratio of 10:10 or more and 10:40 or less with respect to the resin base material. When the weight ratio of the filler to the resin substrate is less than 10:10, the viscosity decreases and flows into the gap between the coil bobbin and the shield member. When the weight ratio exceeds 10:40, the viscosity increases, There is a risk that the working efficiency is lowered and the adhesive force is lowered. Examples of the filler mixed in the resin base material include silica powder.
[0031]
In the above description, as an embodiment of the present invention, a recording / reproducing apparatus that performs recording / reproducing with respect to a floppy disk, that is, a magnetic head device 10 suitable for mounting on a so-called FD drive has been exemplified. Modifications may be made as appropriate without departing from the spirit of the invention.
[0032]
【The invention's effect】
In the present invention, since the resin material is applied between the outer peripheral wall portion of the slider member and the coil bobbin and the shield member in the magnetic head device, and each portion is fixed by this resin material, each portion is joined and integrated with sufficient strength. And mechanical impact resistance can be improved. Further, since the resin material does not flow into the gap between the coil bobbin and the shield member, the coil is not disconnected or the sliding surface is not deformed by shrinkage during curing.
[0033]
Therefore, according to the present invention, it is possible to realize a magnetic head device having excellent impact resistance characteristics, and it is possible to dramatically improve the yield at the time of manufacture. This makes it possible to provide a highly reliable magnetic head device at a low cost.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a part of a magnetic head device shown as a configuration example to which the present invention is applied.
FIG. 2 is a sectional view of the magnetic head device as viewed from the side.
FIG. 3 is a schematic perspective view showing a magnetic head having a conventional structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Magnetic head apparatus 11 Magnetic core 12, 13 Slider 14 Slider member 15 Coil 16, 17 Coil bobbin 18 Shield member 19 Terminal pin 20 Terminal pin holding part 21 Resin material

Claims (8)

A slider member in which sliders are bonded to both sides of the magnetic core;
A coil bobbin mounted on the slider member and having a coil wound thereon;
A shield member containing the coil bobbin,
A resin material that adheres the slider member to the coil bobbin and the shield member is applied between the outer peripheral wall portion of the slider member and the medium side main surface of the coil bobbin and the shield member. Magnetic head device. 2. The magnetic head device according to claim 1, wherein the resin material is applied over the entire circumference of the outer peripheral wall portion of the slider member. 2. The magnetic material according to claim 1, wherein the resin material has a viscosity that does not flow into a gap between the coil bobbin and the shield member before curing and does not impair workability during coating. Head device. 4. The magnetic head device according to claim 3, wherein the resin material is mixed with a filler in a weight ratio of 10:10 or more and 10:40 or less with respect to the resin base material. In a method of manufacturing a magnetic head device, a slider member in which a slider is joined to both sides of a magnetic core, a coil bobbin in which a coil is wound, and a shield member that includes the coil bobbin are mounted.
A magnetic head in which a resin material for fixing the slider member, the coil bobbin, and the shield member is applied between an outer peripheral wall portion of the slider member and a medium side main surface of the coil bobbin and the shield member. Device manufacturing method. 6. The method of manufacturing a magnetic head device according to claim 5, wherein the resin material is applied over the entire circumference of the outer peripheral wall portion of the slider member. 6. The magnetic head according to claim 5, wherein the resin material has a viscosity that does not flow into a gap between the coil bobbin and the shield member before curing and does not impair workability during coating. Device manufacturing method. 7. The magnetic head device according to claim 6, wherein the resin material is a material in which filler is mixed at a weight ratio of 10:10 or more and 10:40 or less with respect to the resin base material. Production method.

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