JP2000322871A - Fixed magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the vibration of a magnetic disk and easily improve the positioning accuracy of the magnetic disk by arranging a control member corresponding to gaps between a plurality of magnetic disks being lamination- supported while maintaining specific disk gaps, and controlling the inflow/ outflow of air into the disk gaps. SOLUTION: For example, magnetic disks 2a-(2d) are alternately piled up alternately with three spacers 12, and are laminately support while maintaining specific gaps between disks. Fixed members 9a-9d and control members 10a-10c are arcuately formed of a resin material corresponding to the outer periphery of the magnetic disks 2a-(2d), and are fixed on a base 8 concentrically. The fixed members 9a-9d and the control members 10a-10c are alternately piled up so that they are arranged in the disk gaps where the end parts of the control members 10a-10c correspond to each other, thus the inflow/outflow of air at the outer-periphery part of the magnetic disks 2a-(2d) is controlled and the generation of disk fluttering can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fixed magnetic disk drive for recording and reproducing digital information on a magnetic disk.

[0002]

2. Description of the Related Art In recent years, with the progress of personal computers and digital devices, fixed magnetic disk drives have
Because of its large capacity and high recording / reproducing speed, it has come to be used in various fields. More specifically, fixed magnetic disk drives are being used as storage devices in, for example, surveillance cameras, non-linear editing machines, portable still cameras and video cameras, and in-vehicle navigation systems. Is gradually expanding its scope. Therefore, the performance required for the fixed magnetic disk device, for example, the capacity and the response speed (recording / reproducing speed) are becoming higher. In fact, recently, the recording density of the fixed magnetic disk drive has been increasing at an annual rate of 60%, and accordingly, the linear density and the track density have also been increasing.
In addition, in order to improve the response speed of the fixed magnetic disk drive, the number of rotations of the spindle motor has been increased, and recently, those having a spindle motor with a rotation number exceeding 10,000 rpm have been put to practical use. Have been.

[0003] In the above-described fixed magnetic disk drive, the linear density has been increasing because of the magnetic head,
A major factor is that the performance of components including the slider and the magnetic disk has been improved. In addition to the above-mentioned factors, the reason why the track density has been increased is that the positioning technology for accurately positioning the magnetic head in the track direction has been improved. In order to improve the accuracy of the positioning in the track direction, it is necessary to expand a control band for positioning and reduce disturbances that hinder positioning. Various factors are cited as disturbances that hinder this positioning. For example, RRO (Repeatable run-out) / NRRO (Non-repeating) generated from the bearing of the spindle motor
Atmospheric run-out and wind from the rotating magnetic disk acting on the head support mechanism.
Furthermore, the disturbance includes magnetic force unevenness of a magnetic force generated from a magnet or the like of a spindle motor, and disk flutter in which a magnetic disk itself vibrates due to wind generated by its rotation. On the other hand, as described above, the rotational speed of the spindle motor is increasing to improve the response speed, and these disturbances tend to increase.

[0004] The above-mentioned disk flutter is described in, for example, Research and Development Report of the Telecommunications Research Institute, 26-2 (1977), 26
As described on page 3, vortices are generated by the inflow and outflow of air at the outer peripheral portion of the rotating magnetic disk, and are generated due to pressure fluctuations caused by the generated vortices. Moreover,
It is known that the occurrence of disk flutter is greatly affected by the distance between the outer peripheral surface of the magnetic disk and the side wall of the housing that houses the magnetic disk (JSME Transactions,
62, 599, p. 2520).

Here, with reference to FIG. 6 and FIG. 7, the causes of the occurrence of disk flutter in the conventional fixed magnetic disk drive will be specifically described. FIG. 6 is an explanatory view showing a specific air flow around the outer peripheral portion of the magnetic disk in the conventional fixed magnetic disk device. FIG. 7 is a specific air flow on the magnetic disk shown in FIG. FIG. In FIG. 6, a conventional fixed magnetic disk drive includes a plurality of magnetic disks 52a, 52b,
Are housed in the housing 51. When these magnetic disks 52a, 52b, 52c,... Are rotated at a high speed by a spindle motor (not shown), the surfaces of the magnetic disks 52a, 52b, 52c,. , 52c1,... Violent air enters and exits as shown by arrows in FIG. Thereby, as shown in FIG. 7, for example, on the surface of the magnetic disk 52a, a plurality of air vortices 53 and an air flow 54 surrounding these vortices 53 are generated. For this reason, the pressure of air acting on the surface of the magnetic disk 52a becomes uneven, and the magnetic disk 52a is excited to generate disk flutter.

A conventional fixed magnetic disk drive for reducing the disk flutter as described above is disclosed, for example, in Japanese Patent Application Laid-Open No. 10-162548.
In this conventional fixed magnetic disk drive, the formation of a forced air flow from the inner circumference to the outer circumference of the magnetic disk suppresses the generation of vortices due to the high-speed rotation of the magnetic disk, thereby reducing disk flutter. Was.

[0007]

In the above-mentioned conventional fixed magnetic disk drive, in order to form the above-mentioned forced air flow, an air flow path and a blower as an air supply source are provided. Needed. For this reason, the conventional fixed magnetic disk device has a problem that the configuration of the device is increased in size. In addition, the track pitch of recent fixed magnetic disk devices is becoming narrower, and the rotation speed of the spindle motor is becoming higher, especially for small HDDs. Therefore, it has become more and more important to reduce the disk flutter due to the airflow with a small configuration.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can reduce the vibration of a magnetic disk without increasing the size of the apparatus. An object of the present invention is to provide a fixed magnetic disk drive that can easily improve positioning accuracy.

[0009]

According to the present invention, there is provided a fixed magnetic disk drive comprising: a plurality of magnetic disks stacked and supported with a predetermined gap between the disks; a spindle motor for rotating the plurality of magnetic disks; A slider equipped with a magnetic head for recording and reproducing data on and from each of the plurality of magnetic disks; a positioning mechanism for moving the slider in a radial direction of the magnetic disk to position the slider at a desired position; A housing for accommodating the spindle motor, the slider, and the positioning mechanism, and disposed corresponding to the gap between the disks,
A regulating member for regulating the inflow and outflow of air into and from the inter-disk space; and a fixing member for fixing the regulating member to the housing. With this configuration, the vibration of the magnetic disk can be reduced without increasing the size of the device or reducing the responsiveness, so that the positioning accuracy of the magnetic head can be easily improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a fixed magnetic disk drive according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of a fixed magnetic disk drive according to a first embodiment of the present invention, and FIG. 2 is a perspective view of the fixed magnetic disk drive shown in FIG. It is sectional drawing which shows the structure of a principal part. 1 and 2, the fixed magnetic disk drive according to the present embodiment accommodates a plurality of magnetic disks 2a, 2b, 2c, and 2d stacked in, for example, four upper and lower stages and recording digital information in a housing 1. I have. Each of these magnetic disks 2a to 2d is provided with a recording area on both the front surface (the front side) and the back surface. In each recording area, a slider 3 equipped with a magnetic head for recording and reproducing digital information data,
A suspension 4 for supporting the slider 3 and an arm 5 for supporting the slider 3 and the suspension 4 are provided. Each slider 3 has a magnetic disk 2a facing the magnetic disk 2a.
Due to the air dynamic pressure generated by the relative motion with
Magnetic disks 2a to 2d corresponding to the mounted magnetic heads
Is floated and supported on the surface. The arm 5 is connected to a positioning mechanism 6 for moving the slider 3 in the radial direction of each recording area and positioning the magnetic head fixed to the slider 3 at a desired position.

In the fixed magnetic disk drive of this embodiment, the magnetic disks 2a to 2d are driven at a desired high rotational speed (for example, 7 rpm).
000 rpm) is provided. The positioning mechanism 6 and the spindle motor 7 are fixed to a base 8 of the housing 1.
The above-described magnetic disks 2a to 2d are mounted on the rotating shaft of a spindle motor 7 via a ring-shaped spacer 12. That is, the magnetic disks 2a to 2d and the three spacers 12 are alternately stacked as shown in FIG. Thus, the magnetic disks 2a to 2d are stacked and supported while maintaining a predetermined space between the disks.

In the fixed magnetic disk drive of this embodiment, regulating members 10a, 10b and 10c for regulating the inflow and outflow of air into and out of the space between the disks, and these regulating members 10a to 10c.
Fixing members 9a, 9b for fixing 10c to the housing 1,
9c and 9d are provided. These fixing members 9a-
9d and the regulating members 10a to 10c are separately formed corresponding to the inter-disk gaps formed between the plurality of magnetic disks 2a to 2d by a resin material, and are formed on the outer circumference of the magnetic disks 2a to 2d. It is formed in a corresponding arc shape. The fixing members 9a to 9d and the regulating members 10a to 10c are fixed to the base 8 concentrically with the outer periphery by bolts or the like shown in FIG. Specifically, the fixing members 9a to 9d and the regulating members 10a to 10c are alternately arranged so that the ends of the regulating members 10a to 10c are arranged in the corresponding gaps between the disks as shown in FIG. Stacked. As a result, in the fixed magnetic disk drive of the present embodiment, as will be described later in detail, the inflow and outflow of air at the outer peripheral portions of the magnetic disks 2a to 2d can be restricted, and the occurrence of disk flutter can be suppressed.

Further, in the fixed magnetic disk drive of the present embodiment, as described above, the regulating members 10a to 10c and the fixing members 9a to 9d are alternately stacked and arranged.
Regulatory members 10a to 10 corresponding to gaps between disks
c can be appropriately and easily fixed to the housing 1. The fixing members 9a to 9d and the regulating members 10a to 10d
“c” is arranged at a position other than the movable range of the slider 3 by the above-described positioning mechanism 6 and is fixed to the housing 1. In the above description, the example in which the fixing members 9a to 9d and the regulating members 10a to 10c are made of a resin material has been described. However, at least one of them may be made of a metal material, preferably aluminum or stainless steel.

In the fixed magnetic disk drive of the present embodiment, the above-described housing 1, the magnetic disks 2a to 2d housed in the housing 1, the slider 3 with the magnetic head mounted thereon, the positioning mechanism 6, and the spindle motor 7 The head disk assembly (HDA) of the fixed magnetic disk drive is constituted by the constituent members including. Further, the fixed magnetic disk drive of this embodiment has a control circuit (not shown) for controlling the head disk assembly and inputting / outputting data to / from each of the magnetic disks 2a to 2d.

Here, with reference to FIG.
The functions 0a to 10c will be specifically described. FIG.
FIG. 4 is an explanatory diagram showing a specific air flow around the outer peripheral portion of the magnetic disk in the fixed magnetic disk device shown in FIG. As shown in FIG. 3, in the fixed magnetic disk drive of the present embodiment, the regulating member 10a is disposed in the space between the magnetic disks 2a and 2b, and their outer peripheral portions 2a1 and 2a.
It restricts the inflow and outflow of air in the space formed by being sandwiched in the vicinity of b1. Similarly, the regulating member 10b is connected to the magnetic disk 2
B and 2c are arranged in the space between the disks and regulate the inflow and outflow of air in the space formed between the outer peripheral portions 2b1 and 2c1. As a result, in the fixed magnetic disk device of the present embodiment, in the flow path of the air flowing into and out of the space between the disks, the corresponding regulating members 10a to 10c function as resistance in the flow path. For this reason, as shown by the arrow in FIG. 3, the air flowing into and out of the space between the disks can be restricted, and the amount of air flowing in and out can be reduced. Thus, in the fixed magnetic disk drive of the present embodiment, the occurrence of disk flutter can be suppressed, and the magnetic disks 2a to 2a can be suppressed.
2d vibration can be reduced.

The specific dimension (shown by "P" in FIG. 3) between the fixing member and the outer periphery of the magnetic disk is 0.1 to 1
mm. The dimension (illustrated by “Q” in FIG. 3) of a portion of the regulating member disposed in the space between the disks is, for example, in a range of 0.5 to 1 mm. The specific dimensions between the regulating member and the surface of the magnetic disk ("3" in FIG. 3)
R ″) is in the range of 0.5 to 1 mm.

As described above, in the fixed magnetic disk drive of the present embodiment, the regulating members 10a to 10c are arranged corresponding to the respective inter-disk gaps formed between the stacked and supported magnetic disks 2a to 2d. Have been. This allows
In the fixed magnetic disk drive of the present embodiment, the resistance in the air flow path (inflow / outflow) in the space between the disks is regulated by the regulating member 1.
It can be increased by 0a to 10c. That is, in the fixed magnetic disk drive of the present embodiment, the regulating member 1
0a to 10c regulate the inflow and outflow of air into and out of the gap between the disks to reduce the amount of inflow and outflow.
The pressure of the air acting on the surface d can be made uniform and stable. As a result, in the fixed magnetic disk drive of this embodiment, it is possible to suppress the occurrence of disk flutter due to the above-mentioned uneven pressure, and to reduce the vibration of the magnetic disks 2a to 2d. As a result, in the fixed magnetic disk drive of the present embodiment, the positioning accuracy of the magnetic head by the positioning mechanism 6 can be easily improved. Furthermore, in the fixed magnetic disk device of the present embodiment, the occurrence of disk flutter is suppressed without using a forced air flow from a blower or the like, so that the configuration of the device can be prevented from increasing in size.

<< Second Embodiment >> FIG. 4 is a perspective view showing a schematic configuration of a fixed magnetic disk drive according to a second embodiment of the present invention, and FIG. 5 is a perspective view of the fixed magnetic disk drive shown in FIG. It is sectional drawing which shows the structure of a principal part. In this embodiment, in the configuration of the fixed magnetic disk device, a plurality of restricting members and a fixing member are integrally formed, and the integrally formed restricting member is divided into a plurality in the circumferential direction of the magnetic disk. It was fixed to the housing. The other parts are the same as those of the first embodiment, and the duplicated description thereof will be omitted. As shown in FIGS. 4 and 5, in the fixed magnetic disk drive of the present embodiment, the regulating members 11a, 11b,
11c is fixed to the base 8 of the housing 1 by bolts or the like shown in FIG. These regulating members 11a to 11
c is the plurality of restricting members 10a to 1 shown in the first embodiment.
0c (FIG. 1) and a plurality of fixing members 9a to 9d (FIG. 1) are integrally formed, and are formed of a resin material.

Each of the regulating members 11a to 11c has a portion disposed in the space between the disks, similarly to the regulating members 10a to 10c of the first embodiment. Specifically, for example, as shown in FIG.
Protrusions 11b1, 11b2, 11b3 are provided and are arranged in the corresponding inter-disk gaps. As a result, the fixed magnetic disk drive of this embodiment restricts the inflow and outflow of air at the outer peripheral portions of the magnetic disks 2a to 2d and suppresses the occurrence of disk flutter, similarly to the first embodiment. You can do it. Further, in the fixed magnetic disk drive of the present embodiment, the integrated regulating members 11a to 11c as described above are provided.
Is used, the work of attaching the regulating members 11a to 11c to the housing 1 can be performed more easily than in the first embodiment.

Incidentally, the fixed magnetic disk drive of the present invention is not limited to any of the above-mentioned embodiments, and the inflow of air into the inter-disk space is controlled by a regulating member arranged corresponding to the inter-disk space. Various modifications are possible based on the gist of the present invention, that is, restricting the output, and they are not excluded from the scope of the present invention. Further, in the description of the above-described embodiment, the example in which the restricting member of the present invention is applied to the fixed magnetic disk device has been described, but the restricting member of the present invention is used in an apparatus for recording and reproducing data on an optical disk or a magneto-optical disk. , The vibrations of those disks may be reduced.

[0022]

As described above, in the fixed magnetic disk drive of the present invention, for a plurality of magnetic disks stacked and supported while maintaining a predetermined space between the disks, the regulating member corresponds to each space between the disks. Are located. Thus, in the fixed magnetic disk drive of the present invention, the resistance in the air flow path (inflow / outflow) in the space between the disks can be increased by the regulating member. That is, in the fixed magnetic disk drive of the present invention, the regulating member regulates the inflow and outflow of air into and out of the space between the disks and reduces the amount of inflow and outflow, so that the pressure of the air acting on the surface of each magnetic disk is uniform and stable. It can be. As a result, in the fixed magnetic disk drive of the present invention, the occurrence of the disk flutter due to the above-mentioned uneven pressure can be suppressed, and the vibration of the magnetic disk can be reduced, so that the positioning accuracy of the magnetic head can be easily improved. be able to. Furthermore, in the fixed magnetic disk drive of the present invention, the occurrence of disk flutter is suppressed without using a forced air flow by a blower or the like, so that the configuration of the drive can be prevented from increasing in size.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a fixed magnetic disk drive according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration of a main part of the fixed magnetic disk device shown in FIG. 1;

FIG. 3 is an explanatory diagram showing a specific air flow around an outer peripheral portion of a magnetic disk in the fixed magnetic disk device shown in FIG. 1;

FIG. 4 is a perspective view showing a schematic configuration of a fixed magnetic disk drive according to a second embodiment of the present invention;

FIG. 5 is a sectional view showing a configuration of a main part of the fixed magnetic disk device shown in FIG. 4;

FIG. 6 is an explanatory diagram showing a specific air flow around the outer peripheral portion of a magnetic disk in a conventional fixed magnetic disk device.

FIG. 7 is an explanatory diagram showing a specific air flow on the magnetic disk shown in FIG. 6;

[Explanation of symbols]

Reference Signs List 1 housing 2a, 2b, 2c magnetic disk 3 slider 4 suspension 5 arm 6 positioning mechanism 7 spindle motor 8 base 9a, 9b, 9c, 9d fixing member 10a, 10b, 10c, 11a, 11b, 11c regulating member 12 spacer

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Makoto Kuwamoto 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Hiroshi Takaso 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (10)

[Claims] A plurality of magnetic disks stacked and supported with a predetermined gap between the disks; a spindle motor for rotating the plurality of magnetic disks; and a device for recording / reproducing data on / from each of the plurality of magnetic disks. A slider on which the magnetic head is mounted, a positioning mechanism for positioning the slider at a desired position by moving the slider in a radial direction of the magnetic disk, and a magnetic disk, the spindle motor, the slider, and the positioning mechanism. A housing for accommodating, a regulating member arranged corresponding to the inter-disk space, for restricting the inflow and outflow of air into and from the inter-disk space, and a fixing for fixing the restricting member to the housing A fixed magnetic disk drive comprising: a member; 2. The fixed magnetic disk drive according to claim 1, wherein the restricting member is disposed at a position other than a movable range of the slider by the positioning mechanism. 3. The fixed magnetic disk according to claim 1, wherein the restriction range of the restriction member is a space formed between the outer peripheral portions of the two magnetic disks. apparatus. 4. The fixed magnetic disk drive according to claim 1, wherein said regulating member is divided into a plurality of parts in a circumferential direction of said magnetic disk. 5. The fixed magnetic disk drive according to claim 1, wherein said regulating member is made of a resin material. 6. The restricting member is formed separately corresponding to each inter-disk space formed between the plurality of magnetic disks, and each restricting member is fixed to the housing by being sandwiched by two fixing members. 3. The fixed magnetic disk drive according to claim 1, wherein: 7. The fixed magnetic disk drive according to claim 6, wherein the range restricted by the restricting member is a space formed between the outer peripheral portions of the two magnetic disks. 8. The fixed magnetic disk drive according to claim 6, wherein the restricting member is divided into a plurality in the circumferential direction of the magnetic disk. 9. The fixed magnetic disk drive according to claim 6, wherein at least one of said regulating member and said fixed member is made of a resin material. 10. The fixed magnetic disk drive according to claim 1, wherein said regulating member and said fixed member are integrally formed.