JP2006309847A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk device having a function of effectively avoiding an influence of an external magnetic field without spoiling lightweight and thin constitution of a primary disk drive body by reducing disabled design alterations etc., while making assembling facilities common and suppressing a rise in manufacturing cost. <P>SOLUTION: The magnetic disk drive is characterized in having a motor which has a case and a rotatable hub and is provided in the case, a disk which has an internal hole into which the hub is inserted and is fitted around the outer periphery of the hub, a head performing information processing for the disk, and an annular shield member which comes into contact with the hub and extends outward radially from the hub to be opposed to the surface of the disk at a prescribed distance, and is made of a high magnetic material in nearly the same shape with the disk. <P>COPYRIGHT: (C)2007,JPO&INPIT

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 disturbing 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 a prior art relating to the magnetic shield function of a disk drive, a technique for shielding external magnetic field of the drive and external or internal electromagnetic noise is described in, for example, Japanese Patent Laid-Open No. 6-236673. 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 its purpose is to make the assembly equipment common, while suppressing an increase in manufacturing cost and reducing the impossibility of a design change or the like, and a disk drive An object of the present invention is to provide a disk device having a function capable of effectively avoiding the influence of an external magnetic field without impairing the lightweight and thinning of the main body.

  In order to solve the above-described problems, a disk device according to the present invention includes a case, a motor having a rotatable hub, and an inner hole through which the hub is inserted. A disk fitted to the outer periphery of the disk, a head that performs information processing on the disk, and contacts the hub and extends radially outward from the hub to face the surface of the disk at a predetermined interval. In addition, it is characterized in that it is made of a high magnetic material and includes the disk and a substantially identical annular shield member.

  The disk device according to the present invention includes a case, a motor having a rotatable hub and attached to the case, and an inner hole through which the hub is inserted, and is fitted to the outer periphery of the hub. A disk, a head that performs information processing with respect to the disk, and a disk clamper that is fixed to an end of the hub and holds the disk on the hub, and that is in contact with the clamper and radially outward from the clamper. The disk is opposed to the surface of the disk at a predetermined interval, and is made of a high magnetic material and includes a substantially circular shield member having the same shape as the disk.

  According to the present invention, by adopting the configuration as described above, the assembly equipment can be shared, the increase in manufacturing cost is suppressed, the impossibility of design change and the like is reduced, and the light and thin disk drive body is reduced. An object of the present invention is to provide a disk device having a function capable of effectively avoiding the influence of an external magnetic field without impairing the above.

A hard disk drive (hereinafter referred to as HDD) will be described in detail below as a magnetic disk device according to an embodiment of the present invention with reference to the drawings.
As shown in FIG. 1 to FIG. 3 and FIG. 6 to FIG. 10, the HDD includes a case 10, and this case is fixed to the base by a rectangular box-shaped base 12 having an open top surface and a plurality of screws. And a top cover 11 with the upper end opening closed.

  A spindle motor 18 attached to the bottom wall of the base 12 and two magnetic disks 16a and 16b supported and rotated by the spindle motor are disposed in the case 10. Further, in the case 10, a plurality of magnetic heads for recording and reproducing information with respect to the magnetic disks 16a and 16b, a carriage assembly 22 which supports these magnetic heads movably with respect to the magnetic disks 16a and 16b, A voice coil motor (hereinafter referred to as VCM) 24 for rotating and positioning the carriage assembly; a ramp load mechanism 25 for holding the magnetic head in a retracted position away from the magnetic disk when the magnetic head is moved to the outermost periphery of the magnetic disk; A substrate unit 21 having a preamplifier and the like is accommodated.

  A printed circuit board (not shown) that controls operations of the spindle motor 18, the VCM 24, and the magnetic head is screwed to the outer surface of the bottom wall of the base 12 via the board unit 21.

  As shown in FIGS. 1 to 3 and 6 to 10, the carriage assembly 22 includes a bearing portion 26 fixed on the bottom wall of the base 12 and a plurality of arms 32 extending from the bearing portion. ing. These arms 32 are positioned parallel to the surfaces of the magnetic disks 16a and 16b and at a predetermined distance from each other, and extend from the bearing portion 26 in the same direction. The carriage assembly 22 includes an elongated plate-like suspension 38 that can be elastically deformed. The suspension 38 is configured by a leaf spring, and the base end thereof is fixed to the distal end of the arm 32 by spot welding or adhesion, and extends from the arm. Each suspension 38 may be formed integrally with the corresponding arm 32.

  A magnetic head 40 is attached to the extended end of the suspension 38. The magnetic head 40 has a substantially rectangular slider and a recording / reproducing MR (magnetic resistance) head formed on the slider, and is fixed to a gimbal portion formed at the tip of the suspension 30. Each of the four magnetic heads 40 attached to the suspension 38 is positioned so as to face each other, and is disposed so as to sandwich each magnetic disk from both sides.

  On the other hand, the carriage assembly 22 has a support frame 45 extending from the bearing portion 26 in the direction opposite to the arm 32, and the voice coil 47 constituting a part of the VCM 24 is supported by the support frame. The support frame 45 is integrally formed on the outer periphery of the voice coil 47 with synthetic resin. The voice coil 47 is positioned between a pair of yokes 49 fixed on the base 12 and constitutes the VCM 24 together with these yokes and a magnet (not shown) fixed to one of the yokes. When the voice coil 47 is energized, the carriage assembly 22 rotates around the bearing portion 26, and the magnetic head 40 is moved and positioned on desired tracks of the magnetic disks 16a and 16b.

  The ramp loading mechanism 25 includes a ramp 51 provided on the bottom wall of the base 12 and disposed outside the magnetic disks 16 a and 16 b, and a tab 53 extending from the tip of each suspension 38. When the carriage assembly 22 rotates to the retracted position outside the magnetic disks 16a and 16b, each tab 53 engages with the ramp surface formed on the ramp 51, and is then lifted by the ramp surface inclination and magnetically. Performs unloading of the head.

  As shown in FIG. 1, the magnetic disks 16a and 16b are formed with a diameter of 65 mm (2.5 inches), have an inner hole 42 at the center thereof, and have magnetic recording layers on the upper and lower surfaces. The spindle motor 18 is constituted by an outer rotor type spindle motor. The spindle motor 18 includes a cylindrical hub 44 that functions as a rotor, and two magnetic disks 16a and 16b are coaxially fitted to the hub, and a predetermined length is set along the axial direction of the hub. Laminated at intervals. The magnetic disks 16a and 16b are rotationally driven integrally with the hub 44 by the spindle motor 18 at a predetermined speed.

  More specifically, a flange 50 that functions as a disk receiving portion is formed on the outer periphery of the lower end portion of the rotatable hub 44. The spindle motor 18 is fixedly arranged at a predetermined position in the case 10 by screwing the motor bracket 52 to the bottom wall of the base 12.

  The two magnetic disks 16 a and 16 b are fitted on the outer peripheral surface of the hub in a state where the hub 44 is inserted into the inner hole 42 and stacked on the flange 50. Further, a spacer ring 54 is fitted on the outer periphery of the hub 44, and is laminated in a state of being sandwiched between the magnetic disks 12a and 12b. The magnetic disks 16 a and 16 b and the spacer ring 54 are fastened and fixed to the hub 44 by a disk clamper 56 screwed to the upper end surface of the hub 44. The disk clamper 56 is rotationally driven integrally with the hub 44 and the magnetic disks 16a and 16b.

  The disk clamper 56 includes a disc-shaped clamp portion 58 having an outer diameter slightly larger than the diameter of the hub 44 and a substantially annular shield member 60 extending radially outward from the clamp portion. For example, the disk clamper 56 may be integrally formed by bending a stainless steel plate having a thickness of about 0.6 mm.

  The clamp part 58 is screwed and fixed to the hub 44 with a screw 57, and is in close contact with the upper end surface of the hub. The outer peripheral portion of the clamp portion 58 is in contact with the upper surface of the central portion of the upper magnetic disk 16 a and presses the two magnetic disks 16 a and 16 b and the spacer ring 54 toward the flange 50 of the hub 44. Thus, the magnetic disks 16a and 16b and the spacer ring 54 are sandwiched between the flange 50 and the clamp portion 58, and are fixedly held on the hub 44 in a state of being in close contact with each other.

  Further, the shield member 60 of the disk clamper 56 is formed one level lower than the clamp portion 58 or at the same height, and faces the surface of the magnetic disk 16a with a predetermined gap. The surface of the shield member 60 facing the magnetic disk 16a is formed in a smooth plane. The interval between the shield member 60 and the magnetic disk surface is set to the minimum as long as the magnetic head 40 and the carriage assembly 22 moving on the magnetic disk 16a do not interfere with the shield member 60. For example, this interval is set to 0.85 mm or less, and is set to 0.85 mm in the present embodiment. Further, the distance between the shield member 60 and the inner surface of the top cover 11 is set to a minimum gap where the shield member and the top cover do not contact each other, and the dimension is set to 0.7 mm or less. In this embodiment, it is set to 0.7 mm.

  The outer peripheral radius d of the shield member 60 is 50 to 110% of the outer peripheral radius D of the magnetic disk, preferably 75 to the outer diameter of the magnetic disk in consideration of the shielding effect of the shield member and interference with other components. It is formed to 100%. In the present embodiment, the outer peripheral radius d of the shield member 60 is set to about 90% of the outer peripheral radius D of the magnetic disks 16a and 16b.

According to the HDD configured as described above, the magnetic disk and the top cover 11 are increased by increasing the outer peripheral radius of the disk clamper 56 that fixes the magnetic disks 16a and 16b to the same extent as the outer peripheral radius of the magnetic disk. Can be effectively reduced by the disk clamper. At the same time, the magnetic head 4
0 and the disc clamper 5 within a range not interfering with the carriage assembly 22
Six shield members 60 are close to the magnetic disk 16a. The disk clamper 56 is screwed to the hub 44 and rotates integrally with the magnetic disks 16a and 16b. Therefore, the surface of the magnetic disk can be magnetically shielded by the disk clamper 56 having the shield member 60 without changing the shape of the top cover or adding an additional separate member.

  As a result, the assembly equipment can be shared, the increase in manufacturing cost is suppressed, the impossibility of design changes, etc. are reduced, and the influence of external magnetic fields is effectively prevented without compromising the lightweight and thin disk drive body. It is possible to provide a disk device having a function that can be avoided.

Next, another embodiment of the present invention will be described with reference to FIGS. 1 to 3 and FIGS. 6 to 10.
As shown in FIGS. 1 to 3 and FIGS. 6 to 10, the magnetic disks 16a and 16b are formed with a diameter of 65 mm (2.5 inches), have an inner hole 42 in the center thereof, and are formed on the upper and lower surfaces. It has a magnetic recording layer. The spindle motor 18 includes a hub 44 that functions as a rotor, and two magnetic disks 16a and 16b are coaxially fitted to each other and stacked at predetermined intervals along the axial direction of the hub. ing. The magnetic disks 16a and 16b are rotationally driven integrally with the hub 44 by the spindle motor 18 at a predetermined speed.

  More specifically, the hub 44 of the spindle motor 18 is formed in a cylindrical shape whose upper end is closed. Inside the hub 44, a spindle shaft 62 is provided coaxially and integrally with the hub. Further, a cylindrical portion 63 protruding toward the inside of the case is integrally formed on the bottom wall 12a of the base 12, and a bearing portion 64 is fitted to the inner periphery of the cylindrical portion. The spindle shaft 62 is rotatably supported while being inserted into the bearing portion 64. Accordingly, the hub 44 is disposed at a predetermined position in the case 10. A stator 66 is provided on the outer periphery of the bearing portion 64, and a magnet 67 is provided coaxially on the inner periphery of the hub 44 and faces the stator 66 with a gap.

  A flange-shaped disc receiving portion 50 is formed on the outer periphery of the lower end portion of the hub 44. The two magnetic disks 16 a and 16 b are fitted on the outer peripheral surface of the hub with the hub 44 inserted through the inner hole 42 and stacked on the disk receiving portion 50. In addition, a spacer ring 54 is fitted on the outer periphery of the hub 44 and stacked in a state of being sandwiched between the magnetic disks 12a and 12b. A disk clamper 56 is screwed to the upper end surface of the hub 44 by a screw 57. The outer periphery of the disk clamper 56 is in contact with the upper surface of the central portion of the upper magnetic disk 16 a and presses the two magnetic disks 16 a and 16 b and the spacer ring 54 toward the disk receiving portion 50 of the hub 44. Thereby, the magnetic disks 16a and 16b and the spacer ring 54 are sandwiched between the disk receiving portion 50 and the clamp portion 58, and are fixedly held on the hub 44 in a state of being in close contact with each other. The disk clamper 56 is rotationally driven integrally with the hub 44 and the magnetic disks 16a and 16b.

According to the present embodiment, the hub 44 includes the substantially annular shield member 70 that extends radially outward from the outer periphery of the lower end portion thereof. The shield member 70 that functions as a shield plate is formed of, for example, a stainless steel plate having a thickness of about 0.6 mm. The shield member 70 may be coaxially positioned with the hub 44 and the magnetic disks 16a and 16b, and may be rotationally driven integrally with the hub 44 and the magnetic disks 16a and 16b. A shield plate formed separately from the hub 44 may be fixed to the hub.

  The shield member 70 extends between the bottom wall 12a of the base 12 and the lower magnetic disk 16b, and faces the surface of the magnetic disk 16b with a predetermined gap. The surface of the shield member 70 facing the magnetic disk 16a is formed in a smooth plane. The distance between the shield member 70 and the magnetic disk surface is set to the minimum as long as the magnetic head 40 and the carriage assembly 22 moving on the magnetic disk 16b do not interfere with the rectifying plate 70. For example, this interval is set to 0.85 mm or less, and is set to 0.85 mm in the present embodiment.

  A recess 72 in which a part of the shield member 70 is located is formed on the inner surface of the bottom wall 12 a of the base 12. The distance between the shield member 70 and the inner surface of the bottom wall 12a is the minimum gap between the rectifying plate and the bottom wall, and the dimension is set to 0.7 mm or less, for example. In this embodiment, it is set to 0.7 mm. The recess 72 of the base 12 can be omitted.

  The outer peripheral radius d of the shield member 70 is 50 to 110% of the outer peripheral radius D of the magnetic disk 16b, preferably 75 of the outer diameter of the magnetic disk in consideration of the rectifying effect of the shield plate and interference with other components. Or 100%. In the present embodiment, the outer peripheral radius d of the shield member 70 is set to about 90% of the outer peripheral radius D of the magnetic disks 16a and 16b.

According to the HDD configured as described above, the shield member 70 is provided on the hub 44 to which the magnetic disks 16a and 16b are attached, and this shield plate increases the outer radius to the same extent as the outer radius of the magnetic disk. Yes. Thereby, the shield member 70 rotates integrally with the hub 44 and the magnetic disks 16a and 16b. For this reason, the surface of the magnetic disk can be magnetically shielded by the shield member 70 integrated with the hub 44 without adding a dedicated separate member.

  As a result, the assembly equipment can be shared, the increase in manufacturing cost is suppressed, the impossibility of design changes, etc. are reduced, and the influence of external magnetic fields is effectively prevented without compromising the lightweight and thin disk drive body. It is possible to provide a disk device having a function that can be avoided.

Next, still another embodiment of the present invention will be described with reference to FIGS. 1 to 3 and FIGS. 6 to 10.
As shown in FIGS. 1 to 3 and FIGS. 6 to 10, according to the present embodiment, the disk clamper 56 attached to the hub 44 and rotating integrally with the hub 44 is slightly larger than the diameter of the hub 44. A disc-shaped clamp part 58 having a diameter and a substantially annular shield member 60 extending radially outward from the clamp part are integrally provided. The disc clamper 56 is integrally formed by, for example, bending a stainless steel plate having a thickness of about 0.6 mm.

  The clamp portion 58 is screwed and fixed to the hub 44 by a screw 57 and is in close contact with the upper end surface of the hub. The outer peripheral portion of the clamp portion 58 contacts the upper surface of the central portion of the upper magnetic disk 16 a and presses the two magnetic disks 16 a and 16 b and the spacer ring 54 toward the disk receiving portion 50 of the hub 44. Thus, the magnetic disks 16a and 16b and the spacer ring 54 are sandwiched between the flange 50 and the clamp portion 58, and are fixedly held on the hub 44 in a state of being in close contact with each other.

  Further, the shield member 60 of the disk clamper 56 functioning as a shield plate is formed one step higher than the clamp portion 58, is positioned coaxially with the magnetic disks 16a and 16b, and has a predetermined gap from the surface of the magnetic disk 16a. Are facing each other. The surface of the shield member 60 facing the magnetic disk 16a is formed in a smooth plane. The interval between the shield member 60 and the magnetic disk surface is set to the minimum as long as the magnetic head 40 and the carriage assembly 22 moving on the magnetic disk 16a do not interfere with the shield member 60. For example, this interval is set to 0.85 mm or less, and is set to 0.85 mm in the present embodiment. Further, the distance between the shield member 60 and the inner surface of the top cover 11 is the minimum gap where the shield member 60 and the top cover do not contact each other, and the dimension is set to 0.7 mm or less, for example. In this embodiment, it is set to 0.7 mm.

The outer peripheral radius d of the shield member 60 is 50 to 110% of the outer peripheral radius D of the magnetic disk, preferably 75 to 75% of the outer diameter of the magnetic disk in consideration of the shielding effect of the shield member and interference with other components. It is formed to 100%. In the present embodiment, the outer peripheral radius d of the shield member 60 is set to about 90% of the outer peripheral radius D of the magnetic disks 16a and 16b.
Other configurations are the same as those of the above-described embodiment, and the same portions are denoted by the same reference numerals, and detailed description thereof is omitted.
According to the HDD configured as described above, the magnetic disk and the top cover 11 are increased by increasing the outer peripheral radius of the disk clamper 56 that fixes the magnetic disks 16a and 16b to the same extent as the outer peripheral radius of the magnetic disk. Can be effectively reduced by the disk clamper. At the same time, the shield member 60 of the disk clamper 56 is brought close to the magnetic disk 16a as long as it does not interfere with the magnetic head 40 and the carriage assembly 22. The disk clamper 56 is screwed to the hub 44 and rotates integrally with the magnetic disks 16a and 16b. Therefore, the surface of the magnetic disk 16a can be shielded by the disk clamper 56 having the shield member 60 without changing the shape of the top cover or adding a separate member. Further, similarly to the embodiment described above, the shield member 70 provided on the hub 44 can shield the surface of the magnetic disk 16b.

  As a result, the assembly equipment can be shared, the increase in manufacturing cost is suppressed, the impossibility of design changes, etc. are reduced, and the influence of external magnetic fields is effectively prevented without compromising the lightweight and thin disk drive body. It is possible to provide a disk device having a function that can be avoided.

  In the above-described embodiment, the magnetic disk 16 and the spacer ring 54 attached to the spindle motor 18 of each embodiment are stacked together with the shield members 60 and 70 so as to sandwich the magnetic disk 16 and the spacer ring 54. The recording medium-shaped shield members 60 and 70 constituting the upper and lower surfaces and the hub surface of the spindle motor 16 form a magnetically conductive “U-shaped” structure. Present inside the structure. Even when the magnetic disk device is exposed to an external magnetic field, since the magnetic flux has a property of easily passing through a member having a high magnetic permeability, the magnetic head 40 inside the U-shaped structure is not affected by the external magnetic field.

As a result, the problem that the external magnetic field resistance is inferior to that of the conventional longitudinal recording method can be solved particularly in the perpendicular recording type magnetic disk device.
Generally, stainless steel is used as the hub material of the spindle motor 16, but the material may be a silicon steel material having a high magnetic permeability in order to further enhance the magnetic shielding effect.
Further, since the shield members 60 and 70 of the embodiment are the same shape as the magnetic disk 16, the magnetic shield effect can be exhibited in the entire moving range of the magnetic head 40.

  In the present embodiment shown in FIG. 3, in the case of a magnetic disk device (no magnetic shield) mounted with four magnetic disks 16a, 16b, 16c, and 16d, the upper and lower magnetic disks 16a and 16d are shield members having the same dimensions. A magnetic shield can be provided simply by replacing 60 and 70 (FIG. 3C). Further, the mounting efficiency of the magnetic disk 16 is improved by thinning the shield materials 60 and 70 and the spacer ring 54 (FIG. 3B).

  In the embodiment shown in FIGS. 4 and 5, in particular, in the partial sectional view in a plane including the spindle motor rotation center axis and the magnetic head 40 moving on the magnetic disk 16 shown in FIG. It is an example which attaches the lower shield member 80 which comprises a lower plane among shield structures to the base 12 side. FIG. 5 is a perspective view showing an example of mounting positions of the base 12 and the base-side shield member 80 in a state where the magnetic disk 16 and the magnetic head 40 are removed. Although the shape of the shield member 80 of this embodiment can be considered variously, in order to obtain a higher magnetic shield effect, the distance between the shield member 80 on the base 12 side and the housing portion of the spindle motor 18 is within 0.3 mm, In addition, the shield effect for the magnetic head 40 is further improved by installing it so as to cover at least the moving range of the magnetic head 40.

  In the embodiment shown in FIG. 6, the shield member 60 constituting the upper plane has a disk shape similar to that of the magnetic disk in the above-described embodiment, but the material of the clamper 58 has a magnetic shield effect. It is an example of substituting it by changing it. The present embodiment is characterized in that the flange portion of the clamper 58 protrudes to the outer peripheral side so as to cover at least the movement range of the magnetic head 40.

  Further, in the embodiment shown in FIG. 8, when the spindle motor 18 is fixed on the shaft and the top cover 10 has a magnetic shield effect, the disk-shaped shield member 70 similar to the top cover 10, the spindle motor 18 and the magnetic disk 16 is used. Thus, a U-shaped magnetic shield can be formed.

  According to the disk device configured as described above, by taking the configuration as described above, the assembly equipment can be made common, while suppressing an increase in manufacturing cost, while reducing the impossibility of design changes, etc. It is possible to provide a disk device having a function capable of effectively avoiding the influence of an external magnetic field without impairing the lightweight and thin drive body.

The top view which shows the inside of HDD which concerns on embodiment of this invention. 1 is a cross-sectional view of an HDD according to an embodiment of the present invention. 4 is a stack example of a magnetic disk and a shield member of an HDD according to an embodiment of the present invention. Sectional drawing of HDD which concerns on another embodiment of this invention. The perspective view of HDA which concerns on another another embodiment of this invention. Sectional drawing of HDD which concerns on another another embodiment of this invention. Sectional drawing of HDD which mounts the some shield member which concerns on embodiment of this invention. Sectional drawing of embodiment with which the top cover of this invention served as the shield member. Sectional drawing of embodiment with a clamper integrated shield member. Sectional drawing of embodiment with a hub integrated shield member.

Explanation of symbols

10 ... Case 11 ... Top cover 12 ... Bases 16a, 16b, 16c, 16d ... Magnetic disk 18 ... Spindle motor 22 ... Carriage assembly 40 ... Magnetic head 44 ... Hub 54 ... Spacer 56 ... Clamper 58 ... Clamping part 60, 70, 80 ... Shield member

Claims (9)

Case and
A motor having a rotatable hub and provided in the case;
Discs each having an inner hole through which the hub is inserted and fitted to the outer periphery of the hub;
A head for performing information processing on the disk;
A shield member that is in contact with the hub and extends radially outward from the hub so as to face the surface of the disk at a predetermined interval and is made of a high magnetic material and has an annular shape substantially the same as the disk. A disk device characterized by the above. The disk device according to claim 1, wherein the shield member is substantially annular and rotatable integrally with the hub. Case and
A motor having a rotatable hub and attached to the case;
Discs each having an inner hole through which the hub is inserted and fitted to the outer periphery of the hub;
A head for performing information processing on the disk;
A disc clamper fixed to the end of the hub and holding the disc on the hub;
The disk includes a shield member made of a high magnetic material and having an annular shape that is substantially the same shape as the disk, contacting the clamper and extending radially outward from the clamper to face the disk surface at a predetermined interval. A disk device characterized by the above. Case and
A motor having a rotatable hub and attached to the case;
Discs each having an inner hole through which the hub is inserted and fitted to the outer periphery of the hub;
A head for performing information processing on the disk;
A disc clamper fixed to the end of the hub and holding the disc on the hub;
The disc clamper is fixed to an end of the hub and holds the center of the disc, and extends substantially outward from the clamp portion in the radial direction and is opposed to the surface of the disc with a predetermined gap. A disk device comprising an annular shield part integrally. A disc clamper fixed to the end of the hub and holding the disc on the hub;
The disk includes a shield member made of a high magnetic material and having an annular shape that is substantially the same shape as the disk, contacting the clamper and extending radially outward from the clamper to face the disk surface at a predetermined interval. The disk device according to claim 1, wherein the disk device is a disk device. A disk clamper fixed to the end of the hub and holding the disk on the hub, the disk clamper being fixed to the end of the hub and holding the center of the disk; 3. A substantially annular shield portion that extends radially outward from the clamp portion and faces the disc surface with a predetermined gap is integrally provided. The disk device described in 1. 7. The disk device according to claim 1, wherein a thickness of the shield member is substantially equal to or less than a thickness of the disk. A gap between the housing and a spindle motor housing that is attached in close contact with the case and rotates the disk is within 0.3 mm, and has a second shield member in a region that covers the moving range of the head. The disk device according to claim 3, wherein the disk device is a disk device. 3. A cover for closing the disk or head disposed in the case together with the case in an airtight state, wherein the cover is made of a soft magnetic material that shields an external magnetic field. The disk device according to any one of the above.

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