JP2001291363A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disk device with little head positioning errors even when rotational vibration is generated in a plane parallel to a disk recording surface. SOLUTION: A housing to house the main parts, such as a head and a disk, is supported by a supporting member fixed in a setting member, a shape of the supporting member is made into a cylindrical shape or a curvature shape, the supporting member is installed in a corner of the housing and by inclining the installation direction of the supporting member to the longitudinal direction of the housing, the housing is flexibly supported to a rotating direction of an intra-plane parallel to the disk recording surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a magnetic disk drive in which the magnetic disk drive is installed on a frame inside a personal computer, a workstation or a disk array device.

[0002]

2. Description of the Related Art Since a disk storage device includes a disk and a head actuator mechanism that moves on the disk, when an impact force acts on the disk storage device, there is a problem that the head and the disk are broken.

As a prior art for solving the above problem, there is an impact-resistant portable disk storage device disclosed in Japanese Patent Application Laid-Open No. Hei 5-314745. This includes an outer box for storing the fixed disk storage device, an electrical connection between the connector provided on the outer box and the disk storage device, a flexible cable supporting the disk storage device, and the outer box facing the connector. On the other end side, a shock absorbing member for absorbing a shock against the elasticity of the flexible cable is provided to suppress a shock force acting on the fixed disk storage device.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 5-314.
The technology disclosed in Japanese Patent Publication No. 745 discloses a technology in which a surface facing a connector and a side surface thereof absorb an external impact force in the vertical and front-rear and left-right directions. Not taken into account.

In a magnetic disk drive, when rotational vibration is applied in a plane parallel to the recording surface of the disk, no moment is transmitted to a head actuator rotatably supported in the disk drive. Is moved. This causes a problem that a head positioning error occurs. The rotational vibration of the magnetic disk device is caused by the reaction force of the driving device for moving the head and transmitted from a personal computer, a workstation, or a frame (hereinafter referred to as a user frame) inside the disk array device. And the interface connector (hereinafter referred to as I
/ F connector).
The I / F connector is a connector installed in the magnetic disk device, and transmits and receives signals between the magnetic disk device and the host controller.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk drive with less head positioning error even when rotational vibration occurs in a plane parallel to the disk recording surface.

[0007]

In order to achieve the above object, according to the present invention, a housing accommodating main parts such as a head and a disk is provided via a support member provided at an angle to the longitudinal direction of the housing. It was fixed to the installation member. In addition,
The shape of the support member was cylindrical or curved.
With this configuration, the housing can be flexibly supported in a rotational direction in a plane parallel to the disk recording surface. Further, by adjusting the frequency in the rotational direction of the housing to a frequency having a good suppression characteristic within the control frequency band in the head positioning control system, it is possible to provide a magnetic disk drive with less head positioning error with respect to rotational vibration.

With the above-described structure, the housing is flexibly supported in the rotational direction in a plane parallel to the disk recording surface. Further, the frequency in the rotational direction of the housing can be adjusted to any frequency within the control frequency band of the head positioning control system, so that good suppression characteristics can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view of the magnetic disk drive of this embodiment. The plane size of the magnetic disk drive is 146 m
mx 101.6 mm. The housing 2 accommodates main components such as a disk 3, a spindle motor (not shown) for rotating the disk 3, a head for reading and writing information, and an actuator 4 which is a driving device for moving the head. The dimensions are 135mm x 90.6
mm. The disk 3 of this embodiment has a diameter of 84 mm, and the rotation speed of the disk 3 is 10000 rpm. The housing 2 is attached to the installation member 1 via a support member 5. The installation member 1 is a member for fixing the magnetic disk device to the user frame.

The housing 2 and the support member 5, and the support member 5 and the installation member 1 are attached by screws or the like.
The installation member 1 is provided with a stopper 6 for preventing a direct collision with the housing 2. The stopper 6 is a component for preventing the housing 2 and the installation member 1 from being deformed even when a large impact is applied during transportation of the apparatus, and the stopper 6 is preferably made of a material having a high damping property, such as rubber or plastic. . The stopper 6 is provided with a space from the housing 2 so as not to restrict the movement of the housing 2.
In order to obtain this space, the housing 2 is provided with an escape portion 2a.

FIG. 2 is a perspective view of the support member 5. The support member 5 is formed integrally with a cylindrical portion (hereinafter, referred to as a cylindrical portion) 5a and a flat plate portion 5b.
b. The flat plate portion 5b is a portion for fixing to the housing 2 and the installation member 1, and the cylindrical portion 5a functions as an elastic body. The direction perpendicular to the axis of the cylindrical portion 5a is the xy plane direction (the plane direction parallel to the recording surface of the disk 3). In the support member 5 of this embodiment, the rigidity in the tangential direction of the cylindrical portion 5a is about 20% of the rigidity in the radial direction. The value is tangential stiffness is 182
5 N / m and the radial stiffness is 9638 N / m. When the support members 5 having such characteristics are arranged as shown in FIG. 1, the total rotational support rigidity (the rigidity for supporting the housing 2 in the rotational direction in the xy plane) of the four support members 5 is about 20 N · m. / Rad. Furthermore, the moment of inertia of the housing 2 is about 0.00223 kg ·
m ² , the natural frequency of the housing 2 in the rotational direction is about 20 Hz.

The flat plate portion 5b of the support member 5 is installed obliquely with respect to the longitudinal direction of the housing 2. For this reason, when the housing 2 is rotationally vibrated, the housing 2 is deformed in the tangential direction (the direction of low rigidity) of the cylindrical portion 5a of the support member 5, so
The housing 2 can be flexibly supported in the rotation direction in the y plane. As described above, it can be said that the housing 2 has a very low natural frequency and is flexibly supported. This allows the housing 2 to rotate in the rotation direction in the xy plane.
Can be flexibly supported. For example, FIG. 8 shows the operation of the present embodiment when the user frame rotates.

FIG. 8 is a conceptual diagram showing a deformed state larger than the actual state in order to make the behavior of the housing 2 and the deformed state of the support member 5 easy to understand. The state before the rotational movement is shown by a solid line, and the state at the time of the rotational movement is shown by a broken line. When the user frame is rotationally deformed at the rotation angle θ1, the rotation angle of the housing 2 remains at θ2, which is smaller than θ1. This is because, when the support member 5 is deformed in a tangential direction having low rigidity, the force by which the support member 5 rotates the housing 2 becomes small even when the user frame rotates.

Returning to FIG. Four support members 5
Are all the same size and material, are arranged at the four corners of the housing 2, and are further inclined by 56 degrees with respect to the longitudinal direction of the housing 2. This is housing 2
Are arranged evenly from the center of the external dimensions. The position of the center of gravity of the housing 2 is located at a position shifted from the center of the outer dimensions of the housing 2. Also in the conventional apparatus, the position of the center of gravity is shifted to the drive device side for moving the head from the center position of the external dimensions. The material of the support member 5 can be realized by rubber, gel, a thin metal plate or the like. When it is formed by a thin plate of metal (spring material), the cylindrical portion 5a and the flat plate portion 5b are separately prepared and integrated by a method such as welding.

FIG. 3 is a side view of the magnetic disk drive shown in FIG. The dimension of the magnetic disk drive in the z direction in this embodiment is 41.3 mm. A screw hole 1 a for fixing the magnetic disk device to the user frame is provided on a side surface of the installation member 1. Although not shown in FIG. 3,
The lower surface of the installation member 1 is also provided with a screw hole 1a for fixing the magnetic disk device to the user frame. Also,
The installation member 1 has a bent portion 1 for fixing the circuit board 7.
b is provided. The circuit board 7 is fixed to the bent portion 1b with screws or the like. The circuit board 7 has an I / F connector 8 for transmitting and receiving signals between the magnetic disk device and the host controller.

FIG. 4 is a sectional view taken along the line AA shown in FIG. The installation structure of the cable 9 for electrically connecting the housing 2 and the circuit board 7 is illustrated. This cable 9 uses what is called a flexible print circuit. The cable 9 has one end connected to the housing 2 and the other end connected to the circuit board 7. The cable 9 has a loop shape so as not to contribute to the support rigidity of the support member 5. The circuit board 7 is fixed to the housing 2 and the I / O
It is also possible to fix the F connector 8 to the installation member 1 and to install the cable 9 between the circuit board 7 and the I / F connector 8.

FIG. 5 shows an example in which the shape of the support member 5 is different. 5 (a) and 5 (b), a plate-shaped spring member is installed as a support member 5 in a curved shape. The use of this support member is more advantageous in reducing costs than the structure of FIG. The support member 5 has a flat portion 5b and a curved portion 5c. The flat portion 5b is a portion for fixing to the housing 2 and the installation member 1, and the curved portion 5c functions as an elastic member. When the material is metal, it is advantageous against radial deformation. On the other hand, when the material is rubber or gel, the damping constant caused by the material is larger than that of metal, which is advantageous in reducing the vibration amplitude of the housing 2.

FIG. 6 shows the disturbance suppression characteristics of the head positioning control system. The control frequency at which the disturbance suppression characteristic becomes 0 dB is about 350 Hz. As described above, the disturbance suppression characteristic for a vibration of about 20 Hz is about -45 dB, which is very large.

FIG. 7 shows a modification of the arrangement of the support members 5.
In this configuration, three support members 5 are provided, one of which is formed at a right angle to the longitudinal direction of the housing 2 without being inclined, and is installed at the center of the short side of the housing 2. In this embodiment,
It is necessary to make the longitudinal dimension of the housing 2 smaller than that of the first embodiment due to space restrictions for mounting the support member 5. When all three support members 5 have the same size and material, the support members 5 installed at an angle to the longitudinal direction of the housing 2 have a right angle to the total support rigidity in the y direction of the two support members. , The support rigidity in the y direction of one support member 5 installed at the position becomes low. Therefore, in order to make the total support rigidity in the y direction similar to that in FIG. 1, it is necessary to increase the support rigidity in the y direction of one support member 5 installed at a right angle.
This means that if three support members 5 are used, none of them can have the same dimensions. In the present embodiment, the total support rigidity in the y direction of the two support members 5 installed at an angle is about 8900 N / m. In order to make the support rigidity in the y direction of one support member 5 installed at a right angle equal to this, the tangential rigidity of the support member 5 should be about 5 times that of the support member of FIG.
Need to double. This means that the total rigidity in the rotational direction of the housing 2 is increased, and the effect is reduced as compared with the case of the configuration shown in FIG. As described above, in the embodiment of the present invention, the configuration of FIG. 1 is the best.

The installation member 1 in this embodiment is shaped so as to surround the housing 2. However, by appropriately providing an opening in the installation member 1, the ventilation between the outside and the inside of the installation member 1 is improved. It is sufficiently possible to enhance the cooling of the housing 2 and the circuit board 7.

The magnetic disk drive of this embodiment is also applicable to a 2.5-type magnetic disk drive having a plane dimension of 100 mm × 70 mm.

With the structure shown in FIGS. 1 to 8, the housing 2 is flexibly supported in the rotational direction in the xy plane.
Further, the frequency in the rotational direction of the housing 2 can be adjusted to a frequency having a good suppression characteristic within a control frequency band in the head positioning control system. As a result, it is possible to provide a magnetic disk drive having a large disturbance suppression characteristic and a small head positioning error.

[0024]

According to the present invention, the housing 2 is flexibly supported in the rotational direction in the xy plane. Further, the frequency in the rotational direction of the housing 2 can be adjusted to a frequency having a good suppression characteristic within a control frequency band in the head positioning control system. As a result, it is possible to provide a magnetic disk drive having a large disturbance suppression characteristic and a small head positioning error.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic disk drive according to an embodiment of the present invention.

FIG. 2 is a perspective view of a support member of the magnetic disk device shown in FIG.

FIG. 3 is a side view of the magnetic disk drive shown in FIG.

FIG. 4 is a partial sectional view of the magnetic disk drive shown in FIG. 1;

FIG. 5 is a diagram showing a modification of the support member of the magnetic disk device shown in FIG.

FIG. 6 is a diagram illustrating a disturbance suppression characteristic of the magnetic disk device in the embodiment of the present invention.

FIG. 7 is a diagram showing a modification of the arrangement of the support members of the magnetic disk drive in the embodiment of the present invention.

FIG. 8 is a diagram showing a state when the frame performs a rotational movement.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Installation member, 2 ... Housing, 3 ... Disk, 4 ... Actuator, 5 ... Support member, 5a ... Cylindrical part, 5b ... Flat plate part, 5c ... Bending part, 6 ... Stopper, 7 ... Circuit board, 8
... I / F connector, 9 ... Cable.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeo Nakamura 2880 Kozu, Odawara-shi, Kanagawa Prefecture Within the Hitachi, Ltd. Storage Systems Division (72) Inventor Masahiko Sega 2880 Kozu, Kozu, Odawara-shi, Kanagawa Hitachi Storage Corporation F term in the system division (reference) 3J048 AA01 AB01 BA05 BC04 DA04 EA07

Claims (5)

[Claims] 1. A housing containing a disk, a spindle motor for rotating the disk, a head for reading and writing information, a driving device for moving the head on the disk, and the housing In a magnetic disk drive including a support member made of an elastic body for supporting, and an installation member connected to the support member and fixed to a user frame, the support member has a cylindrical shape or a curved shape, Installing the support member at at least two corners of the housing;
And a mounting direction of the support member is inclined with respect to a longitudinal direction of the housing. 2. The magnetic disk according to claim 1, wherein the support member is installed at four corners of the housing, and an installation direction of the support member is inclined with respect to a longitudinal direction of the housing. apparatus. 3. The magnetic disk drive according to claim 2, wherein said support member has the same material and dimensions. 4. The head positioning control system determines a natural frequency of the housing in a rotation direction in a plane parallel to a recording surface of the disk, which is determined by a rigidity of the support member and a moment of inertia of the housing. 2. The magnetic disk drive according to claim 1, wherein the frequency is within a frequency band. 5. A housing including a disk, a spindle motor for rotating the disk, a head for reading and writing information, a drive for moving the head on the disk, and the housing. In a magnetic disk drive including a support member made of an elastic body for supporting, and an installation member connected to the support member and fixed to a user frame, the support member has a cylindrical shape or a curved shape, The support member is arranged such that a deformation direction of the support member when the housing rotates in a plane parallel to a recording surface of the disk is a tangential direction of the cylindrical shape or the curved shape. Magnetic disk device.