JP2006221770A - Disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device capable of maintaining a high degree of magnetic shielding in the device and being able to fit in the current industry standard size without largely changing the size of the entire device housing.
A base housing that houses a disk drive mechanism having a magnetic disk and a magnetic head, made of a nonmagnetic material, a top cover that is made of a soft magnetic material and closes the base housing, and on the magnetic disk A planar shield portion disposed opposite to a planar region of the base casing opposite to the moving range of the magnetic head; and a conductive portion continuous with the planar shield section and in contact with the top cover inside the base casing. A magnetic disk drive comprising a magnetic shield member.
[Selection] Figure 1

Description

The present invention relates to a disk device, and more particularly to a disk device having an improved magnetic shield effect.

In recent years, a magnetic disk device representing a hard disk drive (hereinafter sometimes referred to as a disk drive) has developed a perpendicular magnetic recording system along with an improvement in the conventional longitudinal magnetic recording system in order to increase the recording density. Has been promoted.

A disk drive to which the perpendicular magnetic recording system is applied generally includes a head / disk assembly mechanism (HDA mechanism) that uses a single-pole head and a two-layer disk medium. In such a disk drive, it has been confirmed that a single magnetic pole head converges a disturbance magnetic field entering from the outside of the drive, and data on the disk medium is erased immediately below the recording magnetic pole of the head. For this reason, in the disk drive to which the perpendicular magnetic recording system is applied, the technology relating to the magnetic shield function is more important than the longitudinal magnetic recording system.

As the prior art regarding the magnetic shield function of disk drives, the external magnetic field of the drive,
A technique for shielding external or internal electromagnetic noise is described in, for example, Japanese Patent Laid-Open No. 6-236684. Further, it is described in a drive housing structure that can reduce the magnetic flux density caused by the residual magnetization inside the drive, for example, JP-A-8-45261.

Japanese Patent Application Laid-Open No. 2003-77266 discloses a magnetic disk device comprising a shield member provided in a plane area of a casing facing a moving range of a magnetic head and a side area continuous to the plane area. Are listed.
Japanese Patent Laid-Open No. 6-236684 (FIG. 1, abstract) JP-A-8-45261 (FIG. 1, abstract) Japanese Patent Laid-Open No. 2003-77266 (FIG. 1, abstract)

However, these prior arts assume a conventional longitudinal magnetic recording type disk drive, and the magnetic shield effect on a perpendicular magnetic recording type drive using a single pole head has not been verified. In short, the prior art does not mention an effective external magnetic field blocking method for realizing a perpendicular magnetic recording type disk drive.

As described above, the perpendicular magnetic recording type disk drive has a configuration in which a single magnetic pole head and a two-layer disk medium are combined. Therefore, it is necessary to control the influence of an external magnetic field on the disk medium. That is, in the structure of the drive, the magnetic flux from the main pole of the single pole head passes through the recording layer of the two-layer disk medium, passes through the soft magnetic layer provided below the recording layer, A magnetic circuit returning to the sub-magnetic pole side of the head is formed. By this magnetic circuit, data is recorded on the recording layer of the disk medium. Therefore, when an external magnetic field is applied to the disk medium instead of a single pole head, a similar magnetic circuit is formed, resulting in a phenomenon that recorded data on the disk medium is erased.

In order to avoid the influence of such an external magnetic field, it is conceivable that the disk drive main body is constituted by a casing made of a magnetic material, or a magnetic shield member is provided on the entire casing. However, such a method increases the weight of the drive itself and increases the size of the drive.

Further, in the magnetic disk device described in Japanese Patent Application Laid-Open No. 2003-77266, which includes a shield member provided in a plane area of the casing facing the moving range of the magnetic head and a side area continuous to the plane area, the magnetic shield member is A tape or foil is attached so as to surround (wrap) the outside of the device casing. For this reason, the dimension of the whole apparatus housing | casing becomes large and may exceed a predetermined standard dimension.

Accordingly, the present invention has been made to solve the above-described problems, and maintains the magnetic shielding performance in the apparatus at a high level, and can be kept within the current industry standard size without greatly changing the dimensions of the entire apparatus housing. It is an object of the present invention to provide a disk device capable of performing the above.

In order to solve the above-described problems, a disk device according to the present invention is made of a nonmagnetic material,
A base housing that houses a disk drive mechanism having a magnetic disk and a magnetic head, a top cover that is made of a soft magnetic material and closes the base housing, and that faces the moving range of the magnetic head on the magnetic disk A magnetic shielding member having a planar shield portion disposed opposite to a planar region of the base casing and a conduction portion that is continuous with the planar shield section and contacts the top cover inside the base casing. It is what.

According to the present invention, by adopting the configuration as described above, it is possible to maintain the magnetic shielding performance in the apparatus at a high level, and to fit within the current industry standard size without greatly changing the overall dimensions of the apparatus casing. It is possible to provide a possible disk device.

Hereinafter, a magnetic disk device, a so-called hard disk drive (hereinafter referred to as HDD) will be described in detail as a disk device according to an embodiment of the present invention with reference to the drawings.

(First embodiment)
1 to 4 are diagrams showing a structure of an HDD according to a first embodiment of the present invention.
In the HDD according to the first embodiment, a spindle motor (not shown) is fixed to an aluminum alloy base housing 101, and a magnetic disk 103 as a medium is rotatably attached to the spindle motor. A perpendicular magnetic recording layer, which is a recording layer capable of perpendicular magnetic recording, is provided on the magnetic disk 103, that is, on the front and back surfaces. Magnetic disk 103
Is fastened and fixed to a rotor (not shown) by a clamper 102, and a spindle motor rotates the rotor, whereby the magnetic disk 103 can also rotate at high speed.

The magnetic disk 103 has a unit bearing 107 for supporting a head sub-assembly 106 having a magnetic head (not shown) for recording / reproducing the data on the base housing 101 with respect to the recording layer. A voice coil motor 104, which is a drive source provided near the rotation center 107, is used as a magnetic disk 1 by a voice coil motor 104.
03, and is configured to record and reproduce data on the magnetic disk 103.

As described above, the HDD according to the present embodiment is a drive to which a perpendicular magnetic recording system having a recording layer made of a perpendicular magnetization film on the surface of the magnetic disk 103 is applied.
A magnetic shield member 112 for blocking an external magnetic field that affects the HDD from the external space of the HDD is provided outside the apparatus housing, in particular, the base housing 101 along the media plane direction.

The magnetic shield member 112 is arranged on the magnetic disk 103 so as to be opposed to the planar area of the base casing 101 facing the moving range of the magnetic head, and is continuous with the planar shield section 112. An upper and lower shield conducting portion 108 (hereinafter referred to as a conducting portion) that is in contact with a top cover 109 that closes the base casing 101 inside the body 101 and achieves magnetic conduction is provided.

In the present embodiment, the top cover 109 is made of a soft magnetic material and also serves as an upper magnetic shield plate in the media plane direction of the magnetic disk 103. As the soft magnetic material forming the top cover 109, for example, iron-based material SPCC (cold rolled steel plate), SUS430 (stainless steel plate), silicon steel plate, or the like can be used.

A lower shield plate 112 in a range that covers the movement trajectory of the magnetic head mounted in the HDD is disposed at the lower portion of the magnetic disk 103 in the medium plane direction, that is, on the outer surface of the base casing 101 of the apparatus.

Similarly to the top cover 109, the lower shield plate 112 is made of, for example, an iron-based material SP.
CC (cold rolled steel plate), SUS430 (stainless steel plate), silicon steel plate and the like can be used.

In the present embodiment, the bottom shield plate 112 is continuously connected to the top cover 1.
The conduction part 1 that protrudes in the direction 09 and is fixed so as to be in contact with the top cover 109 to conduct.
08 is attached to the lower shield plate 112 by a method selected from press fitting, welding, brazing, or screwing.

The upper and lower shield plate conduction portions 108 are connected to the conduction portion through holes 110 provided in the base casing 101.
Then, the lower shield plate 112 is attached to the outer surface of the base casing 101. In this embodiment, it is fixed with screws.

A leak-proof gasket 111 is inserted between the base housing 101 and the lower shield plate 112 on the outer surface of the base housing 101 in order to keep the inside and outside of the apparatus airtight.

The upper and lower shield plate conduction portions 108 are connected to the conduction portion through holes 110 provided in the base casing 101.
Then, the lower shield plate 112 is attached to the outer surface of the base casing 101. In this embodiment, it is fixed with screws.

FIG. 3 is a view seen from the lower side of the HDD device in order to explain in detail the mounting state of the HDD and the lower shield plate 112 according to the present embodiment.
On the inner surface of the device of the top cover 109, on the part facing the upper and lower shield plate conduction part 108,
A leak-proof gasket 113 is provided to keep confidentiality inside the HDD device when the upper and lower shield plate conducting portions 108 are fixed from the outside of the top cover 109 with screws or the like.

Further, as described above, a groove in which the gasket 111 is fitted is provided in the outer peripheral portion of the base housing 101 of the conduction portion through hole 110 of the base housing 101. The plate 112 is pressed to ensure an airtight state.

The leak-proof gaskets 111 and 113 are resin materials that can be elastically deformed, and an ultraviolet curable acrylic resin is used.
4 is a front view from the top of the HDD according to the present embodiment (FIG. 4A), a cross-sectional view taken along line B (FIG. 4B), and the upper and lower shield plates of the cross-sectional view 4B. 4 is an enlarged view (FIG. 4) partially enlarged to explain the details of the mounting state in the vicinity of the conductive portion 108.

(C)).
In the present embodiment, the top cover 109 and the upper and lower shield conducting portions 108 are fixed to the top cover 109 by a soft magnetic material screw and are magnetically conducted. Further, the leak prevention gasket 113 has a size that is in close contact with the conducting portion 108, and has a structure that prevents leakage, that is, maintains an airtight state in the apparatus casing.

As described above, in the present embodiment, the flat shield portion disposed opposite to the flat area of the base casing 101 facing the moving range of the magnetic head on the magnetic disk 103 with respect to the top cover 109 made of a soft magnetic material. 112 is formed by a base casing 108 and a top cover 109.
In the space within the DD housing, that is, inside the base housing 108, by contacting and conducting with the top cover 109, the magnetic shielding property in the device is maintained at a high level, and the overall size of the device housing is greatly changed. Therefore, it is possible to provide a disk device that can fit within the current industry standard size.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment described above, the top cover 109 is made of a soft magnetic material, and the top cover 109 also serves as an upper shield plate. Therefore, in the second embodiment of the present invention, when the top cover 109 is not a soft magnetic material, the movement range of the magnetic head on the magnetic disk 103 with the top shield plate 118 on the outer surface of the top cover 109 as shown in FIG. The second embodiment is different from the first embodiment in that it is disposed at a portion facing the plane region and facing the planar region.

The HDD according to the present embodiment is also a drive to which a perpendicular magnetic recording system having a recording layer made of a perpendicular magnetization film on the surface of the magnetic disk 103 is applied. A magnetic shield member 112 for blocking an external magnetic field that affects the HDD from the external space of the HDD is provided outside the base casing 101.

The magnetic shield member 112 is arranged on the magnetic disk 103 so as to be opposed to the planar area of the base casing 101 facing the moving range of the magnetic head, and is continuous with the planar shield section 112. An upper and lower shield conducting portion 108 (hereinafter referred to as a conducting portion) that is in contact with a top cover 109 that closes the base casing 101 inside the body 101 and achieves magnetic conduction is provided.

In the present embodiment, the top cover 109 is not a soft magnetic material. Therefore, for example, the upper surface shield plate 118 using an iron-based material such as SPCC (cold rolled steel plate), SUS430 (stainless steel plate), silicon steel plate or the like is the outer surface of the top cover 109 and the moving range of the magnetic head on the magnetic disk 103. It is arrange | positioned in the part which opposes to a plane area | region.

Then, the lower part of the magnetic disk 103 in the medium plane direction, that is, the base casing 10 of the apparatus.
A lower shield plate 112 is arranged on the outer surface of 1 so as to cover the movement trajectory of the magnetic head mounted in the HDD.

Similarly to the top cover 109, the lower shield plate 112 is made of, for example, an iron-based material SP.
CC (cold rolled steel plate), SUS430 (stainless steel plate), silicon steel plate and the like can be used. Other configurations are almost the same as those in the first embodiment.

As described above, in the present embodiment, with respect to the top cover 109 that is not a soft magnetic material, the outer surface of the top cover 109 has a planar area of the base casing 101 that faces the moving range of the magnetic head on the magnetic disk 103. The upper surface shield plate 118 is disposed oppositely, and the lower surface shield plate 112 having the upper and lower shield conducting portions 108 is formed on the upper surface shield portion 118 in the space in the HDD housing formed by the base housing 108 and the top cover 109, that is, the base Case 1
In 08, by contacting and conducting with the top shield plate 118 disposed on the top cover 109, the magnetic shielding property in the apparatus can be maintained at a high level even if the top cover 109 does not have magnetism. It is possible to provide a disk device that can be accommodated in the current industry standard size without greatly changing the size of the entire device housing.

In the top cover 109, the upper surface shield part attachment region 119 is formed in a recess or notch in an area where the upper surface shield part 118 is attached, that is, in a range that covers the movement locus of the magnetic head. The upper shield part 118 is positioned.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In the first embodiment described above, the lower shield plate 112 is attached to the outer surface of the base casing 101. However, in the present embodiment, as shown in FIG. 6, the lower shield plate 112 is disposed on the inner surface of the base casing 112 directly below the magnetic disk 103, so that the lower shield plate 112 and the upper and lower shield conducting portions 108 are arranged. Is an example of arrangement in an airtight space inside the apparatus housing.

The upper and lower shield conducting portions 108 are threaded to conduct with the top cover 109 or the upper shield plate 118. A through hole (hollow) may be provided in the upper and lower shield conducting portions 108 and the lower shield plate 112, and the base casing 101 may be threaded to provide magnetic conduction. Further, the lower shield plate 112 and the upper and lower shield conducting portions 108 can be attached to the base casing 101 by bonding, or by integrally forming the base casing 101 with an aluminum alloy, in addition to screwing.

In the base casing 101, the bottom shield part 1 is directly below the magnetic disk 103.
The bottom shield part 112 is positioned by forming the bottom shield part attachment area 120 in a recess or notch in the area where the head 12 is attached, that is, in the range covering the movement locus of the magnetic head. .

(Modifications in the above embodiments)
FIG. 7 is a diagram showing variations in the cross-sectional shape of the upper and lower shield plate conduction portions 108. This modification can be applied to the upper and lower shield plate conduction portions 108 in the above-described embodiments. In each of the previous embodiments, the upper and lower shield plate conducting portions 108 have a cylindrical shape.
It is also possible to use a triangle, a quadrangle, or a polygon more than that. Further, as shown in FIGS. 7C, 7D, and 7E, a cylindrical shape, a triangle shape, and a quadrangular shape may be extracted to form a tubular shape. Further, as shown in FIGS. 7F and 7G, the shape of the upper and lower shield plate conduction portions 108 may be freely determined according to the shape of the empty area inside the HDD device.

In the structure in which the upper and lower shield plate conducting portions 108 are formed in a U-shape outside the apparatus, the thickness at which the magnetic shield effect is actually obtained is 0.2 mm to 0.4 mm even in a tape shape or a foil shape. In the case of 0.3 mm, a width of about 40 mm is required. At present, it is difficult to mount the conductive portion having the above dimensions outside the standard size of the apparatus.

As described in the above embodiments, when the upper and lower shield plate conducting portions 108 are penetrated through the inside of the apparatus housing or mounted inside, a cylinder having a diameter of 4 mm can be used to obtain the same cross-sectional area as the above dimensions. Yes, it is possible to effectively utilize the empty area inside the apparatus housing, and it is easy to keep the apparatus width within the standard.
According to the disk device configured as described above, by taking the configuration as described above,
It is possible to provide a disk device that can maintain a high level of magnetic shielding in the device and can be accommodated in the current industry standard size without greatly changing the overall size of the device housing.

1 is an exploded perspective view of an HDD according to a first embodiment of the present invention. 1 is a perspective view of an HDD according to a first embodiment of the present invention (without a cover). 1 is an exploded perspective view of an HDD according to a first embodiment of the present invention as viewed from the base housing side. 1 is a cross-sectional view of an HDD according to a first embodiment of the present invention. The disassembled perspective view of HDD which concerns on the 2nd Embodiment of this invention. The perspective view of HDD which concerns on the 3rd Embodiment of this invention. The deformation shape variation of the upper and lower shield plate conduction part of the present invention.

Explanation of symbols

101 ... Base housing 102 ... Clamper 103 ... Magnetic disk 104 ... Voice coil motor 105 ... Ramp 106 ... Head sub-assembly 107 ... Unit bearing 108 ... Upper and lower shield conducting portion 109 ... Top cover 110 ... … Through hole 111… leak prevention gasket 112… bottom shield plate 113… leak prevention gasket 118… top shield portion 119… top shield portion attachment area 120… bottom shield portion attachment region

Claims (6)

A base housing made of a non-magnetic material and containing a magnetic disk and a disk drive mechanism having a magnetic head;
A top cover made of a soft magnetic material and closing the base housing;
A flat shield portion disposed opposite to a plane region of the base casing facing the moving range of the magnetic head on the magnetic disk, and the flat shield section continuous with the flat shield section and in contact with the top cover inside the base casing. A magnetic disk device comprising: a magnetic shield member having a conduction portion. The base housing has a through-hole into which the conduction portion of the magnetic shield member can be inserted,
The plane shield portion of the shield member contacts the outer plane of the base casing corresponding to the moving range of the magnetic head on the magnetic disk,
The said conduction | electrical_connection part is penetrated by the through-hole of the said base housing | casing, and this through-hole vicinity is sealed with a gasket and fixed so that it may contact the said top cover. Disk unit. The planar area of the shield member contacts the inner plane of the base casing corresponding to the moving range of the magnetic head on the magnetic disk,
The disk device according to claim 1, wherein the conductive portion is fixed so as to contact the top cover inside the housing. A base housing made of a non-magnetic material and containing a magnetic disk and a disk drive mechanism having a magnetic head;
A top cover made of a non-magnetic material and closing the base housing;
A top shield portion disposed opposite to a planar area of the top cover corresponding to a moving range of the magnetic head on the disk; and a planar area of the base casing facing the moving range of the magnetic head on the magnetic disk. And a magnetic shield member comprising a bottom shield portion disposed opposite to the bottom shield portion and a conduction portion that is continuous with the bottom shield portion and contacts the top shield portion inside the base casing. . The magnetic disk is formed with a perpendicular magnetization film that enables perpendicular magnetic recording,
5. The upper surface shield portion and the lower surface shield portion of the magnetic shield member are disposed so as to cover an upper and lower head moving range sandwiching the magnetic head in a planar direction of the magnetic disk. Disk unit. The thickness of the upper surface shield part and the lower surface shield part of the magnetic shield member is 0.2 mm or more, the width is 8 mm or more, and the cross-sectional area of the conducting part is 8 mm 2 or more. The disk device described.

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