JP2004079007A - Magnetic head device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic head device in which impact resistance is greatly improved and the occurrence of coil discontinuity and deformation of a sliding surface is prevented and to provide its manufacturing method. <P>SOLUTION: Resin material 21 is applied to the outer peripheral wall section of a slider member 14 which is made by joining sliders 12 and 13 to the both side sections of a magnetic core 11 and between coil bobbins 16 and 17 that are mounted on the member 14 and the medium side main surface of a shield member 18. Thus, the slider member 14, the coil bobbins 16 and 17 and the member 18 are fixed by the material 21 so as to jointly reinforce the joining condition of each section. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a magnetic head device for recording and reproducing a magnetic signal on and from a magnetic recording medium such as a magnetic disk, and a method of manufacturing the same.
[0002]
[Prior art]
2. Description of the Related 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 device, an external magnetic field corresponding to the recording data is applied to a magnetic recording medium by a magnetic head, thereby operating a magnetic polarity in a specific minute area on the magnetic recording medium. Form a recording mark. When reproducing data, the magnetic polarity of a recording mark formed on a magnetic recording medium is detected by a magnetic head, 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 for recording and reproducing a magnetic signal to and from a magnetic disk, and a pair of sliders 102 and 103 joined to both sides of the magnetic core 101. Slider member 104 is provided. The slider member 104 has the magnetic core 101 inserted into the shield member 107, and the shield member 107 is bonded and fixed on both sides (sliders 102 and 103).
The magnetic head 100 includes a pair of coil bobbins 105 and 106 mounted on the slider member 104, and a ring-shaped shield member 107 containing the coil bobbins 105 and 106.
[0005]
The coil bobbins 105 and 106 are formed of a non-magnetic material such as a plastic material, for example, and each has a coil wound therearound. The coil bobbins 105 and 106 are respectively inserted through a pair of legs formed on the magnetic core 101, and are held on the slider member 104 by stoppers (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 includes a plurality of terminal pins 108 connected to the coils wound around the coil bobbins 105 and 106, and a resin pin fixing member 109 for fixing 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 the 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 the FD drive is dropped and an external impact is applied, for example, A large force is locally applied to the ferrite shield member 107, the ceramic sliders 102 and 103, or the magnetic core 101, the coil bobbins 105 and 106 are mounted, and the sliders 102 and 103 are bonded to the shield member 107 only. The fixed slider member 104 may be damaged.
[0009]
If the slider member is damaged, not only will the recording / reproducing characteristics be significantly impaired, but also, in some cases, normal recording / reproducing operations will become impossible.
[0010]
In order to solve this problem, for example, measures have been proposed to improve impact resistance by injecting a resin into a gap between the coil bobbins 105 and 106 and the shield member 107 and bonding and fixing the resin to the shield member. In such a case, there is a possibility that the injected resin contracts at the time of curing, thereby causing disconnection of the coil and deformation of the sliding surface.
[0011]
In view of the above, the present invention has been made in view of the above-described conventional circumstances, and has a magnetic head device capable of significantly improving impact resistance and preventing disconnection of a coil and deformation of a sliding surface. It is an object of the present invention to provide a manufacturing method thereof.
[0012]
[Means for Solving the Problems]
A magnetic head device according to claim 1 of the present invention includes a slider member having sliders joined to both sides of a magnetic core, a coil bobbin mounted on the slider member and wound with a coil, and including the coil bobbin. 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. It is characterized by having.
[0013]
A method of manufacturing a magnetic head device according to a fifth aspect of the present invention provides a method of manufacturing a magnetic head device, comprising: a slider member having sliders joined to both sides of a magnetic core; a coil bobbin having a coil wound thereon; In the method of manufacturing a magnetic head device in which the slider member is mounted, the slider member, the coil bobbin, and the shield member are fixed between an outer peripheral wall of the slider member and a medium-side main surface of the coil bobbin and the shield member. It is characterized in that 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. It can be joined and integrated with strength, and mechanical shock resistance can be improved. Further, since this resin material does not flow into the gap between the coil bobbin and the shield member, there is no occurrence of disconnection of the coil or deformation of the sliding surface due to 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 parts can be sufficiently ensured, but it is preferable to apply the resin material over the entire outer peripheral wall of the slider member. . This makes it possible to ensure the maximum joint strength between the respective portions by the resin material, and to significantly improve the impact resistance.
[0016]
Further, the resin material used in the present invention is not particularly limited to its material and composition, but does not flow into the gap between the coil bobbin and the shield member before curing, and is of a degree that 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 during coating, and to improve the work efficiency of the coating process. Can be.
[0017]
Further, as the resin material, 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 base material 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 and There is a possibility that the working efficiency is reduced and the adhesive strength is reduced. Examples of the filler mixed into the resin base material include silica powder.
[0018]
BEST MODE FOR CARRYING OUT 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 a configuration example of the present invention. FIG. 1 is a schematic perspective view showing the magnetic head device 10 with a part 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 for recording and reproducing a magnetic signal to and from a magnetic disk, and a pair of sliders 12 and 13 joined to both sides of the magnetic core 11. And a slider member 14 constituted by the following. The slider member 14 has the magnetic core 11 inserted into the shield member 18 and the shield member 18 is bonded and fixed on both sides (sliders 12, 13).
Further, the magnetic head device 10 includes a pair of coil bobbins 16 and 17 around which the coil 15 is wound, and a ring-shaped shield member 18 including the coil bobbins 16 and 17, respectively. The slider member 14 is mounted on the main surface configured by the slider member 18.
[0020]
The magnetic core 11 is formed of a magnetic material having a sufficient saturation magnetic flux density, and forms a magnetic path. In addition, the magnetic core 11 has a magnetic gap formed of a nonmagnetic material such as a glass material on a surface that slides on the magnetic disk. The sliders 12 and 13 are formed in a plate shape from a nonmagnetic material such as a ceramic material, for example, and are joined to both sides of the magnetic core 11, respectively.
[0021]
The magnetic head device 10 performs recording / reproduction while a slider member 14 constituted by a magnetic core 11 and sliders 12 and 13 slides on a magnetic disk on a surface on a side where a 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 from a non-magnetic and non-conductive material such as various plastic materials. The legs of the magnetic core 11 are respectively inserted through the centers of the holes, and the slider members are not shown. 14. Further, 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 through the terminal pin 19, and this magnetic field generates a leakage magnetic field from the magnetic gap through the magnetic core 11 and is applied to the magnetic disk. Thus, a magnetic signal is recorded. When reproducing a magnetic signal recorded on the magnetic disk, a magnetic field recorded on the magnetic disk is taken into the magnetic core 11 from the magnetic gap, and a change in the magnetic field is converted into a current by the coil 15 so that the terminal pin 19 And extract it as an electric signal.
[0024]
The shield member 18 is formed in a ring shape from a magnetic material such as permalloy or ferrite, and has a function of blocking the magnetic core 11 and the coil 15 disposed therein from external magnetic field noise. FIGS. 1 and 2 show an example in which the shield member 18 has a structure in which the shield member 18 is laminated by a plurality of plate members. Can be suppressed, and the noise cutoff characteristics can be improved.
[0025]
By the way, the magnetic head device 10 is configured by the outer peripheral wall 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 on the side of the magnetic disk and the joined state of each part is reinforced by the resin material 21. Therefore, these parts (for example, the slider member 14 and the coil bobbins 16 and 17 and the coil bobbins 16 and 17 and the shield member 18 and the like) are securely fixed, and are integrally joined to each other with sufficient strength.
[0026]
Therefore, even when a large shock is applied from the outside by dropping the recording / reproducing device in a state where the magnetic head device 10 is mounted on various recording / reproducing devices, the slider member 14 and the other components can be connected to each other. A large force is not applied due to collision or the like, and it is possible to prevent each part from being damaged by an impact.
[0027]
Further, in the magnetic head device 10, the resin material 21 is applied only between the outer peripheral wall 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 the shield members 16 and 17 is not filled. Therefore, disconnection of the coil 15 and deformation of the sliding surface do not occur due to shrinkage or the like generated when the resin material 21 is cured, and a high-quality magnetic head device 10 can be manufactured with high yield.
[0028]
FIG. 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 the bonding strength between the respective portions is sufficiently 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 of the slider member 14. However, it is desirable that the coating be applied over the entire circumference of the outer peripheral wall of the slider member 14, so that the bonding strength between the respective parts by the resin material 21 can be maximized, and the shock resistance characteristics are greatly improved. be able to.
[0029]
The resin material 21 is not particularly limited in its material or 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 the 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 during coating, and to improve the work efficiency of the coating process. Can be.
[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 base material 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 and There is a possibility that the working efficiency is reduced and the adhesive strength is reduced. Examples of the filler mixed into the resin base material include silica powder.
[0031]
In the above description, the magnetic head device 10 mounted on a so-called FD drive as a recording / reproducing apparatus for recording / reproducing on a floptical disk has been exemplified as an embodiment of the present invention. Changes may be made as appropriate without departing from the spirit of the invention.
[0032]
【The invention's effect】
According to the present invention, since a resin material is applied between the outer peripheral wall of the slider member and the coil bobbin and the shield member in the magnetic head device, and the respective parts are fixed by the resin material, the respective parts are integrally joined with sufficient strength. And the mechanical impact resistance can be improved. Further, since this resin material does not flow into the gap between the coil bobbin and the shield member, there is no occurrence of disconnection of the coil or deformation of the sliding surface due to 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 to dramatically improve the yield in manufacturing the magnetic head device. This makes it possible to provide a magnetic head device having high reliability at low cost.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a magnetic head device as one configuration example to which the present invention is applied, with a part cut away.
FIG. 2 is a sectional view of the magnetic head device as viewed from a 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 device 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 having sliders joined to both sides of a magnetic core,
A coil bobbin mounted on the slider member and wound with a coil;
A shield member containing the coil bobbin,
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. Magnetic head device. 2. The magnetic head device according to claim 1, wherein the resin material is applied over the entire outer peripheral wall of the slider member. The magnetic material according to claim 1, wherein the resin material does not flow into the gap between the coil bobbin and the shield member before curing, and has a viscosity that does not impair workability during application. Head device. 4. The magnetic head device according to claim 3, wherein the resin material has a filler mixed with the resin base material in a weight ratio of 10:10 or more and 10:40 or less. In a method for 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 including the coil bobbin are mounted.
A magnetic head, wherein a resin material for fixing the slider member, the coil bobbin, and the shield member is applied between an outer peripheral wall 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 outer peripheral wall of the slider member. 6. The magnetic head according to claim 5, wherein the resin material has a viscosity such that it does not flow into the gap between the coil bobbin and the shield member before curing and does not impair workability during application. Device manufacturing method. 7. The magnetic head device according to claim 6, wherein as the resin material, 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 is used. Production method.

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