JPH09251765A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily attenuate an impact of a comparatively high frequency and to prevent a mechanical part of the device from flawing. SOLUTION: A magnetic disk, a magnetic head and a driving mechanism, etc., are housed in a case of the device. The case is equipped with plural fitting parts 42 for fitting the device to a supporter of electronic equipment, and each fitting part has a fitting member 48 fixed to the case. Each fitting member has a sleeve 50 formed with a screw hole and a vibration proof part 52 interposed between the sleeve and the case, and the vibrationproof part is formed of a viscoelastic material to attenuate a vibration of a frequency comprising a resonance point of the driving mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device having a vibration isolation structure.

[0002]

2. Description of the Related Art In recent years, magnetic disk devices have been widely used as memories for storing a large amount of information in electronic devices such as personal computers, laptop computers, and book computers.

This type of magnetic disk device is provided with a magnetic disk as a recording medium, a magnetic head for recording / reproducing information on / from the magnetic disk, a mechanism section for driving the magnetic head, etc., which is housed in a housing. ing.

Generally, in a comparatively large magnetic disk device of about 5 inches, a housing containing a mechanical section has a chassis holding a printed circuit board for controlling the mechanical section and a vibration-proof rubber or the like. It is attached via a vibration isolation mechanism, and is further installed in the personal computer by screwing this chassis to a frame of the personal computer or the like.

In the conventional anti-vibration mechanism, the lower limit of the range in which the vibration can be sufficiently damped and the operation of the magnetic disk device can be guaranteed, the vibration frequency is 5 Hz, and the shock is 11 mse half cycle.
It is often set to c.

Generally, the vibration transmission characteristics of a vibration isolating mechanism when a forced vibration is applied from the outside have a resonance point in the bottom region, and the vibration isolating mechanism is not a vibration isolator for frequencies near this resonance point. , It becomes a vibration mechanism.

On the other hand, a relatively small magnetic disk device of about 2.5 inches is fixed to a frame or the like of a personal computer with a screw by utilizing a plurality of screw holes provided in a housing. Even in such a small magnetic disk device, it is conceivable to provide an anti-vibration rubber or the like as an anti-vibration mechanism between the housing and the frame of the personal computer.

However, for example, when the allowable size of the anti-vibration rubber is set according to the 2.5-inch magnetic disk device, the resonance point of the vibration transmission characteristic is 50 to 10
In many cases, the frequency is in the vicinity of 0 Hz, and the shock cannot be attenuated in the vicinity of 50 Hz, which requires shock resistance in a large-sized magnetic disk device, and conversely causes vibration. For this reason, conventionally, the housing of the magnetic disk device is often screwed and fixed directly to the frame without using a vibration proof rubber.

[0009]

SUMMARY OF THE INVENTION However, 2.5
In many cases, a small-sized magnetic disk device of inch or less is mounted on a portable notebook computer or the like, and a shock of about 11 msec half cycle is not received in this notebook computer like a large-sized magnetic disk device. Rare, rather 2 msec or less, 250 in frequency
There is a high risk of shocks above Hz being applied.

Further, the portable personal computer described above is more likely to be subject to vibration and shock than the desktop personal computer, and the magnetic disk device incorporated therein is required to have higher shock resistance. To be done. On the contrary, in the magnetic disk device, further miniaturization and large capacity are desired, and in order to meet the demand, it is necessary to increase the mounting density of the mechanical parts housed in the housing. Further, as the mounting density is increased, the rigidity of the mechanism portion is reduced, so that it is difficult to improve the impact resistance by improving the mechanism portion in a small-sized magnetic disk device, and another means is required.

In recent years, the shock resistance required for a magnetic disk device is 200 G (G value) or more,
In some cases 500G may be required. When the impact exceeding 200 G is taken into consideration, the influence of the resonance of the mechanism cannot be ignored. In other words, if the magnetic disk drive receives a shock,
The magnetic head and the magnetic recording medium collide with each other to cause damage,
The resonance point of the magnetic head and the drive mechanism that drives it is
Both are in the vicinity of 2 KHz. Therefore, a shock of 2 KHz,
That is, the impact resistance is significantly reduced with respect to the impact of the half cycle of 0.25 msec.

The present invention has been made in view of the above points, and an object thereof is to provide a magnetic disk device capable of sufficiently attenuating a shock of a relatively high frequency and preventing damage to a mechanical portion. is there.

[0013]

To achieve the above object, a magnetic disk apparatus according to the present invention according to claim 1 comprises a magnetic disk and a magnetic head for recording and reproducing information on and from the magnetic disk. A drive mechanism that supports the magnetic head so as to be movable with respect to the magnetic disk, and moves the magnetic head to a desired position on the magnetic disk;
And a housing accommodating the drive mechanism, and a plurality of mounting portions each having a mounting member fixed to the housing and mounting the housing to a support.

Each of the mounting members is formed of a viscoelastic material and is interposed between the sleeve having a screw hole and the sleeve and the housing, and has a frequency including the resonance point of the drive mechanism. Anti-vibration part to damp the vibration of
It is characterized by having.

According to a second aspect of the present invention, there is provided a magnetic disk device including a magnetic disk having a diameter of 65 mm, a magnetic head for recording and reproducing information on the magnetic disk.
The magnetic head is movably supported with respect to the magnetic disk, and a drive mechanism for moving the magnetic head to a desired position on the magnetic disk, the magnetic disk, the magnetic head, and the drive mechanism are housed. A housing,
Each has an attachment member fixed to the casing, and a plurality of attachment portions for attaching the casing to the support.

The drive mechanism has a vibration resonance point of about 2 to 3 KHz, and each mounting member is interposed between the sleeve having a screw hole and the sleeve and the casing. And a vibration-damping part formed of a viscoelastic material for attenuating vibrations having a frequency of at least 2-3 KHz.

According to a third aspect of the present invention, there is provided a magnetic disk device, a magnetic disk, a magnetic head for recording and reproducing information on and from the magnetic disk, and the magnetic head is movable with respect to the magnetic disk. A drive mechanism that supports the magnetic head and moves the magnetic head to a desired position on the magnetic disk, a housing formed of a metal material and containing the magnetic disk, the magnetic head, and the drive mechanism, and the housing. And a plurality of mounting portions for mounting the casing to a support body made of a metal material, the mounting member having a mounting member fixed to the body.

Each of the mounting members is formed of a viscoelastic material and is interposed between the sleeve having a screw hole and the sleeve and the housing, and has a frequency including the resonance point of the drive mechanism. Anti-vibration part to damp the vibration of
At least one of the mounting members has electrical conductivity capable of electrically conducting the housing and the support member, and another mounting member electrically connects the housing and the support body. It is characterized by having an insulating property to insulate.

According to the magnetic disk device configured as described above, when the housing is mounted on the support through the mounting member that is a combination of the vibration isolator and the sleeve, the vibration transmitted from the support to the housing, The shock is damped by the vibration isolator. Therefore, the vibration resistance and shock resistance of the magnetic disk device are improved. In particular, vibrations and impacts at frequencies at which resonance points of the drive mechanism concentrate are effectively damped, and damage to the drive mechanism can be reliably prevented.

Further, by making at least one of the plurality of mounting members conductive, a high frequency electromagnetic wave generated in the magnetic disk device is transmitted to the support side through the housing and the mounting member, and is transmitted to the outside. Leakage is reduced.
Furthermore, by giving insulation to other mounting members,
The inflow of noise current from the support side to the housing is reduced, and the reliability of operation of the magnetic head, drive mechanism, etc. is improved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a hard disk drive (hereinafter, referred to as an HDD) as a magnetic disk device will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the HDD is
A flat rectangular housing 10 formed of a metal material is provided. The housing 10 has a rectangular box-shaped base 12 having an open upper surface, a top cover 14 screwed to the base by a plurality of screws to close the upper end opening of the base,
It consists of.

In the base 12, a magnetic disk 16 as a magnetic recording medium, a spindle motor 18 for supporting and rotating the magnetic disk, a pair of magnetic heads 20 for recording and reproducing information on and from the magnetic disk, and a magnetic disk for these magnetic heads. A carriage assembly 22 that movably supports the head with respect to the magnetic disk 12, a voice coil motor (hereinafter referred to as VCM) 24 that rotates and positions the carriage assembly, and a substrate unit 26 having a preamplifier and the like are housed.

A printed circuit board 28 for controlling the operations of the spindle motor 18, the voice coil motor 24, and the magnetic head 20 is screwed to the bottom surface of the base 12 via a board unit 26, and is connected to the bottom wall of the base. Located opposite each other. Most of the printed circuit board 28 is covered with a bottom cover 30 screwed to the bottom wall of the base 24.

The magnetic disk 16 is formed to have a diameter of 65 mm (2.5 inches) and has magnetic recording layers on its upper and lower surfaces. Then, the magnetic disk 12 is fitted into a sleeve (not shown) of the spindle motor 18, and is rotationally driven at a predetermined speed by the spindle motor.

The carriage assembly 14 includes the base 1
The bearing unit 32 fixed on the bottom wall of the second unit 2, the pair of arms 34 (only one is shown) extending parallel to each other from the bearing unit, and the coil (not shown) of the VCM 24 extending from the bearing unit And a mounted support frame.

An elongated suspension 36 formed of a leaf spring is fixed to each arm 34 and extends above the magnetic disk 16. The magnetic head 20 is attached to the extended end of the suspension 36. As a result, the magnetic head 20 moves to the suspension 3
It is rotatably supported around the bearing unit 32 via 6 and the arm 34.

The pair of magnetic heads 20 supported by the arms 34 face each other with the magnetic disk 16 interposed therebetween, and face the upper surface and the lower surface of the magnetic disk, respectively. A predetermined head load is applied to each magnetic head 20 by the spring force of the suspension 36, and the magnetic head 20 is pressed against the surface of the magnetic disk when the magnetic disk is stopped.

By driving the VCM 24, the arm 34 of the carriage assembly 22 is rotated, and the magnetic head 20 is moved along the radial direction on the magnetic disk 16 and positioned on a desired track.

The carriage assembly 22 and the VCM 24 configured as described above function as a drive mechanism for the magnetic head 20 and have a vibration characteristic having a resonance point at about 2 to 3 KHz.

As shown in FIGS. 1 to 3, the base 12
On both left and right side surfaces of the HDD, four attachment portions 42 for attaching the HDD to a support frame (support body) 40 of an electronic device such as a personal computer are provided, and the base 1
HDD on the bottom of 2 as a support for different types of electronic devices
There are four mounting portions 44 for mounting the.

As shown in FIGS. 2 to 4, the mounting portion 4
The base 2 includes two circular recesses 46 formed on each side surface of the base 12 and mounting members 48 fitted in the recesses. Each mounting member 48 has a cylindrical sleeve 5
0, and a cylindrical vibration isolator 52 that fits around the outer periphery of the sleeve 50 and has a flange 51 at one end. The inner surface of the sleeve 50 is threaded on its peripheral surface to form a threaded hole. The mounting member 48 is fitted into the recess 46 with the flange 52 of the vibration isolator 52 abutting the outer surface of the base 12, and the vibration isolator 52 is provided between the sleeve 50 and the base 12. positioned.

On the other hand, the mounting portion 44 also has a base 12
Each of the bottom surfaces has a recess formed in the vicinity of each side edge, and a mounting member 48 fitted in each recess. When mounting the HDD on the support frame 40 of the electronic device using the four mounting portions 42, as shown in FIG. 2 and FIG. 4, the HDD 10 is mounted on the support frame with both side surfaces of the housing 10 arranged between the support frames 40. The fixing screw 56 is screwed into the sleeve 50 of each attachment member 48 through the formed through hole 58. As a result, the housing 10 of the HDD is attached to the mounting portion 4
2 and the fixing screw 56, and is attached to the support frame 40.

Here, the sleeve 50 of each mounting member 48
Is made of metal or non-metal material. Further, the vibration isolator 52 functions as a vibration isolator that attenuates shock and vibration transmitted from the support frame 40 side of the electronic device, and is a viscoelastic material having high vibration damping property, such as butyl rubber or urethane rubber. The vibration damping characteristic of the synthetic rubber is set to a predetermined characteristic according to the vibration characteristic of the drive mechanism arranged in the housing 10.

That is, as described above, the magnetic head 2
0 and the resonance points of the drive mechanism such as the carriage assembly 22 are approximately 2 to 3 KHz, respectively.
2 is at least 2-3 KHz by properly selecting the material of the viscoelastic substance and the dimensions such as diameter and length.
It is formed so that the frequency of is in the attenuation range.

If a portable personal computer is considered as the electronic device in which the HDD is mounted, HD
Since a shock having a half cycle of about 2 msec may be applied to D, the vibration isolator 52 has a minimum frequency of 250 Hz in the attenuation range.
Is set to be Even in this case, the frequencies of 2 to 3 KHz are naturally in the attenuation range.

By using the mounting member 48 configured as described above, the vibration and shock transmitted to the HDD via the support frame 40 of the electronic device can be attenuated by the vibration isolator 52, and the vibration resistance of the HDD and Impact resistance can be greatly improved. In particular, it is possible to effectively damp vibrations and impacts at frequencies at which the resonance points of the HDD drive mechanism are concentrated, and to reliably prevent damage to the drive mechanism.

The sleeve 50 of each mounting member 48 is formed integrally with the vibration isolator 52 by adhesion or insert molding. When the sleeve 50 is formed of a non-metallic material, for example, plastic, it is possible to perform two-color molding with the vibration isolator 52, and it is possible to reduce the manufacturing cost.
Further, each attachment member 48 is fixed in the recess 46 of the base 12 by adhesion, or is integrally attached to the base 12 by insert molding.

On the other hand, both the support frame 40 of the electronic device and the housing 10 of the HDD are made of a metal material. In this case, a high-frequency noise current may flow from the electronic device side into the housing 10 of the HDD through the support frame 40, and may adversely affect the recording / reproducing operation of the magnetic head 20. In addition, since the substrate unit 26 and the like arranged in the housing 10 of the HDD generate high-frequency electromagnetic waves during operation, it is necessary to shield this electromagnetic wave to prevent leakage to the outside.

Therefore, according to the present embodiment, at least one attachment member 48 of the four attachment portions 42 and at least one attachment member 48 of the four attachment portions 44 are supported by the housing 10. It is formed to be electrically conductive to the frame 40, and the housing 10 has an electromagnetic shield function by connecting the housing 10 to the ground on the electronic device side. Further, the other mounting member 48 is configured to electrically insulate between the housing 10 and the support frame 40, and prevents a noise current from flowing from the support frame 40 to the housing 10.

More specifically, the anti-vibration portions 52 of all the mounting members 48 are formed of conductive synthetic rubber, the sleeve 50 of the conductive mounting member is formed of a conductive material, and the other mounting members are formed. The sleeve is made of an insulating material or is subjected to an insulating treatment.

On the contrary, the sleeves 5 of all the mounting members 48
0 is made of a conductive material, and the vibration-proofing portion 52 of the conductive mounting member is made of conductive synthetic rubber, and the vibration-proofing portions of the other mounting members are made of non-conductive synthetic rubber. May be.

When the mounting member 48 having conductivity is fixed to the recess 46 of the base 12 by adhesion, it is fixed by using a conductive adhesive. Further, in order to minimize the influence of noise current on the magnetic head 20, the above-mentioned conductive mounting member 48 is mounted on the mounting portion farthest from the magnetic head among the plurality of mounting portions 42 or 44.
It is desirable to use

According to the HDD configured as described above,
By providing the mounting member 48, which is a combination of the vibration isolator 52 and the sleeve 50, on each of the mounting portions 43 and 44 of the housing 10, the vibration and shock transmitted from the electronic device in which the HDD is mounted are attenuated, and the vibration resistance and Impact resistance can be greatly improved. In particular, it is possible to effectively damp vibrations and impacts at frequencies at which the resonance points of the HDD drive mechanism are concentrated, and to reliably prevent damage to the drive mechanism.

At least one of the plurality of mounting members 48 is formed so that the housing 10 can be electrically connected to the electronic device side, and the other mounting members are formed so as to be able to insulate between them. It is possible to prevent the noise current from entering the HDD from the electronic device side and improve the reliability of the operation.
It is possible to shield high-frequency electromagnetic waves generated inside D to prevent radiation to the outside.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the number of magnetic disks and the number of magnetic heads can be increased as needed. Further, the vibration characteristic of the mechanical portion of the HDD can be variously changed according to the design, and the damping characteristic of the vibration isolating portion is not limited to the numerical values shown in the above-mentioned embodiment, but can be variously modified according to the mechanical portion. Is.

[0047]

As described above in detail, according to the present invention, by using the housing provided with the mounting portion having the vibration isolating portion, the vibration resistance and the shock resistance are improved, and the relatively high frequency is used. It is possible to provide a magnetic disk device capable of damaging vibrations and impacts of the device and preventing damage to the mechanism part.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a top cover of an HDD according to an embodiment of the present invention is removed.

FIG. 2 is a perspective view showing the HDD and a support frame of a personal computer.

FIG. 3 is a side view and a bottom view of the HDD.

FIG. 4 is an enlarged sectional view showing a mounting portion of the HDD.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Housing 12 ... Base 14 ... Top cover 16 ... Magnetic disk 20 ... Magnetic head 22 ... Carriage assembly 24 ... Voice coil motor 40 ... Support frame 42, 44 ... Attachment part 48 ... Attachment member 50 ... Sleeve 52 ... Anti-vibration part 56 ... Fixing screw

Claims (5)

[Claims] 1. A magnetic disk, a magnetic head for recording and reproducing information on and from the magnetic disk, a magnetic head movably supported on the magnetic disk, and a magnetic head for the magnetic head. A drive mechanism for moving it to a desired position on the disk, a housing accommodating the magnetic disk, the magnetic head, and the drive mechanism, and an attachment member fixed to the housing, respectively. And a plurality of mounting portions for mounting on a sleeve, wherein each mounting member is formed of a viscoelastic material and is interposed between the sleeve having a screw hole and the sleeve and the housing. A magnetic disk drive, comprising: a vibration isolator that damps vibration of a frequency including a resonance point of a drive mechanism. 2. A magnetic disk having a diameter of 65 mm, a magnetic head for recording / reproducing information on / from the magnetic disk, the magnetic head movably supported on the magnetic disk, and the magnetic disk. A drive mechanism for moving the head to a desired position on the magnetic disk, a housing accommodating the magnetic disk, the magnetic head, and the drive mechanism, and an attachment member fixed to the housing, respectively. And a plurality of mounting portions for mounting to the support, the drive mechanism has a vibration resonance point of about 2 to 3 KHz, and each mounting member includes a sleeve having a screw hole formed therein, and the sleeve. And a housing, which is interposed between the housing and the housing, is formed of a viscoelastic material, and has a vibration damping portion that damps vibrations of a frequency of at least 2 to 3 KHz. Qi disk device. 3. A magnetic disk, a magnetic head for recording / reproducing information on / from the magnetic disk, the magnetic head movably supported on the magnetic disk, and the magnetic head is magnetic. A drive mechanism for moving it to a desired position on the disk, a housing formed of a metal material, containing the magnetic disk, the magnetic head, and the drive mechanism, and an attachment member fixed to each of the housings, A plurality of mounting portions for mounting the housing to a support made of a metal material, wherein each of the mounting members includes a sleeve having a threaded hole, and the sleeve interposed between the sleeve and the housing. At least one of the mounting members, which is formed of a viscoelastic substance and which damps vibrations of frequencies including the resonance point of the drive mechanism. The housing and the supporting member are electrically conductive so that the housing and the supporting member can be electrically conducted, and the other mounting member has an insulating property for electrically insulating the housing and the supporting member. And a magnetic disk device. 4. The magnetic disk drive according to claim 1, wherein the vibration isolator has a cylindrical shape and is integrally formed on the outer circumference of the sleeve by insert molding. . 5. The magnetic disk device according to claim 1, wherein each of the mounting members is integrally formed with the housing by insert molding.