JP2003228959A - Disk device and method of assembling the same - Google Patents

Abstract

(57) Abstract: In a disk device, a data track interval can be narrowed by reducing vibration of a spindle system including a disk which is air-excited by high-speed rotation. An air bearing plate (10) facing the surface of a rotary information recording disk (1), and the air bearing plate (10) is moved in the axial direction of the information recording disk (1) to move the air bearing plate (1).
An adjusting means 11 capable of adjusting an axial gap between the air bearing surface 10a and the surface of the information recording disk 1; fixing means 8, 9 for fixing the air bearing plate 10 in a state where the axial gap is adjusted; 11 and 43 were provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device and a method of assembling the same, and more particularly, to a disk device and a method of assembling a disk device that realizes a high recording density by reducing disk vibrations due to air-exciting force and the like accompanying high-speed disk rotation. Regarding

[0002]

2. Description of the Related Art FIG. 15 is a perspective view showing a structure widely used in a magnetic disk device. A spindle hub 2, which is rotated by a spindle motor 5 (hereinafter abbreviated as "SPM"), has one disk 1 for recording and storing information, or a plurality of disks at equal intervals via a spacer (not shown). 1 is laminated and fixed. A magnetic head 41 for recording and reproducing information is rotatably arranged on both sides or along one side of the disk 1. SPM
When the disk 5 rotates, the magnetic head 41 slightly floats above the disk 1 due to the air flow generated between the surface of the disk 1 and the magnetic head 41. This magnetic head 41 is fixed to the tip of an actuator 45, and
5 to the other end of the voice coil motor 46 (hereinafter, "VC
The coil 47 is abbreviated as “M”). The magnetic head 41 is rotated about the actuator rotation center shaft 45a by the driving force of the VCM 46 and is movable on the disk 1 in the radial direction. The data is recorded as magnetic information on a spirally drawn data track on the disk 1, and the magnetic head 41 is rotated by the rotation of the SPM 5, that is, the rotation of the magnetic head 41. You can access any location in.

In order to read and write data accurately, the magnetic head 41 needs to follow the data track accurately. The magnetic head 41 follows the data track by detecting the current position from servo information discretely drawn at a plurality of positions at equal angular intervals on the data track and correcting the deviation from the data track by the actuator 45.
That is, it is performed by moving the magnetic head 41. Since the flying height of the magnetic head 41 is about several tens of nm, and the intervention of dust between the magnetic head 41 and the disk 1 damages the magnetic head 41 and the disk 1 and causes a failure. The magnetic disk device is assembled in a clean room, and after assembled, it is sealed with a cover (not shown) and an airtight member (not shown).

The information recording apparatus has a large capacity (high density), high transfer rate, high reliability, low power consumption, low cost, small size, light weight,
Various characteristics such as portability are required. The magnetic disk device has an advantage in satisfying user's convenience particularly in terms of capacity and transfer speed, and is indispensable for computers and the like. It is considered that further increase in capacity and speed, that is, higher density and higher speed, will continue in the future.
Along with that, narrowing of the data track interval and high-speed rotation of SPM, which are influential means for realizing each, will continue to progress.

In order to reduce the data track interval, it is necessary to improve the positioning accuracy of the magnetic head 41 on the data track. That is, it is required to reduce the shake of the SPM 5 and the disk 1, which is the dominant factor that hinders high-precision positioning. Among them, the problem is asynchronous rotation runout caused by the bearing of SPM5,
It is the natural vibration of the spindle system and the resonance due to the matching of their frequencies.

Among these, the asynchronous rotation runout of the bearing can be greatly reduced by using a fluid bearing whose mass production system has been established in recent years. Even in the case of ball bearings, there is a tendency to decrease year by year due to improvement in processing technology.

Resonance due to non-synchronous runout of the ball bearings and the fact that the natural frequencies of structures such as a spindle system are the same can be avoided in most cases by design and can be improved by using a fluid bearing. You can also do it.

In order to reduce the shake due to the natural vibration of the spindle system, it is necessary to reduce the exciting force or to make the shake less likely to occur with respect to the exciting force. When the SPM 5 rotates, the air in the vicinity thereof and the air between the disks 1 also rotate, and when the SPM 5 rotates at a high speed, the generated air flow also becomes a high speed, and a turbulent flow and a vortex are generated. As a result, an unsteady pressure difference that fluctuates with time is generated in the vicinity of the disk 1, and the air excitation force based on the pressure difference is a major factor for exciting the natural vibration of the spindle system including the disk 1. As described above, the rotational speed of the SPM 5 tends to increase due to the increase of the transfer speed, and therefore the air exciting force also tends to increase. As described above, the reduction of the shake due to the natural vibration of the spindle system and the high-speed rotation of the SPM 5, that is, the narrowing of the data track interval and the high-speed rotation of the SPM 5 have opposite directions, and it is difficult to achieve both technical problems. Is.

As one of the methods for reducing the shake due to the natural vibration of the spindle system with respect to the air excitation force in the conventional magnetic disk device, a squeeze air is provided in which the surface of the disk 1 is provided with a minute gap and a smooth surface is installed opposite thereto. Bearing plates have been proposed.

FIG. 16 is a sectional view showing the structure of a squeeze air bearing plate in a conventional magnetic disk device.
The squeeze air bearing plate 49 is fixed on the housing 43. The squeeze air bearing surface 49a facing the disk 1 is a smooth surface parallel to the surface of the disk 1 and faces the surface of the disk 1 with a minute gap. The squeeze air bearing surface 49a faces the disk 1 not in the entire surface of the disk 1 but in a partial area from the vicinity of the middle circumference to the outer circumference of the disk 1 in the radial direction. Further, the squeeze air bearing plate 49 is the disc 1
Often provided partially in the circumferential direction of
This is due to dimensional restrictions, such as avoiding the rotating area of the magnetic head (not shown) and securing a space for installation on the housing 43. Varies by design. Further, the squeeze air bearing surface 49a may be provided so as to face the surfaces of all the plurality of discs 1, or may be provided so as to face only one of the surfaces. The action of the squeeze air bearing surface 49a is that the viscous resistance force at the time of movement corresponding to the disk vibration of the air flowing between the surface of the disk 1 and the squeeze air bearing surface 49a facing the disk 1 and the spindle system. It is based on the fact that it works as the main force to suppress the vibration of.

[0011]

In order to enhance the effect of reducing the vibration of the disk 1 by using such a squeeze air bearing plate 49, the axial distance between the squeeze air bearing surface 49a and the surface of the disk 1 is set. The squeeze air bearing surface 49a may be provided so as to face the position where the vibration velocity is large on the surface of the disk 1, and the area where the squeeze air bearing surface 49a faces the surface of the disk 1 may be increased.

However, regarding the distance between the conventional squeeze air bearing surface 49a and the surface of the disk 1, relying on the improvement of the machining accuracy of parts to reduce the distance increases the cost and the price competitiveness becomes important. This is an unacceptable method in the information equipment industry. In the magnetic disk device, most of the surface of the disk 1 is a data area, and by any chance, the squeeze air bearing surface 49a.
If it comes into contact with the disk, the surface of the disk 1 rotating at a high speed will be scratched, which will adversely affect the flying characteristics of the magnetic head 5 or destroy data, so it is designed to avoid contact. There is a need to. If the gap between the two is guaranteed by design in this way, the value varies depending on the size of the diameter of the disc 1 and the number of laminated layers. When the squeeze air bearing plate 49 is provided, the industrially realizable gap is about 0.3 mm. This value is the same as the disk receiving surface 2c of the spindle hub 2 and the housing 43.
Of the squeeze air bearing plate mounting surface 43c, the dimensional error between the squeeze air bearing surface 49a and the mounting surface 43c, the inclination of the disk receiving surface 2c and the accompanying inclination of the disk 1, and the clamping of the disk 1 It is set in consideration of the warp of the disc 1, the deformation of the disc 1, the squeeze air bearing plate 49, and the housing 43 at the time of vibration and impact.

The position where the squeeze air bearing surface 49a faces the surface of the disk 1 is often provided from the vicinity of the middle circumference of the disk 1 to the outer circumference thereof as described above. The vibration velocity of the SPM 5 and the disk 1, which is the main factor that hinders the positioning of the magnetic head on the data track, increases toward the outer periphery, so that the squeeze air is moved to a position where the vibration velocity of the disk 1 is large. The position where the bearing surface 49a and the surface of the disk 1 face each other is provided. However, at this position, the inclination of the disc 1 and the amount of deformation of the disc 1 at the time of vibration / impact become large at the same time.
There is a demerit that the gap with a must be enlarged.

The location where the squeeze air bearing surface 49a faces the surface of the disk 1 is restricted due to dimensional restrictions such as avoiding the rotating area of the magnetic head and securing a space for installation on the housing 43. It can only be partially provided in the circumferential direction. That is, under the condition that the dimensions of other parts are not sacrificed, the range of, for example, about 45 ° to 200 ° is actually a feasible value. However, the value of about 200 ° can be taken in the case 43.
Is a value that can be applied only to the surface of the disk 1 that faces the disk 1. When the squeeze air bearing plate 49 is inserted into the gap between the pair of disks 1, a value of about 90 ° can be realized.

If the squeeze air bearing surface 49a is opposed to the surfaces of all the disks 1, the damping effect is increased in principle. However, in reality, the distance between the disks 1 of the current magnetic disk device may be smaller than 2 mm, and the thickness of the squeeze air bearing plate 49 itself is 1 mm.
However, the squeeze air bearing plate 49 itself vibrates and only a small effect can be obtained. Further, finishing the squeeze air bearing surface of the squeeze air bearing plate in a comb shape facing the surfaces of all the disks 1 to be a smooth surface itself causes a large cost increase.
In order to facilitate the processing of the smooth surface, the squeeze air bearing surface 49a is made into another piece composed of a flat plate,
Although it is possible to assemble the comb-shaped squeeze air bearing plate 49 after the surface finishing, in that case, the squeeze air bearing plate 49a and the mounting surface of the squeeze air bearing plate 49 to the housing 43 are formed. The dimensional error becomes large, and in order to deal with this, the gap between the disk 1 and the squeeze air bearing surface 49a needs to be increased, and the squeeze effect is reduced.

Thus, the squeeze air bearing plate 49
There is much room for improvement in the structure of (1) in order to obtain a greater damping effect or to reduce costs. SUMMARY OF THE INVENTION It is therefore an object of the present invention to make it possible to reduce the distance between data tracks in a disk device by reducing the vibration of a spindle system including a disk that is air-excited by high-speed rotation.

[0017]

In order to solve the above problems, the disk apparatus of the present invention is provided with a dynamic pressure air bearing plate facing the surface of a rotary information recording disk.

With such a structure, since the dynamic pressure air bearing plate is provided, the distance between the dynamic pressure air bearing plate and the surface of the disk facing the dynamic pressure air bearing plate along the axial direction of the information recording disk is The disk vibration can be reduced even if the contact between the two can be avoided by design and the value can be industrially manufactured.

Further, in the disk apparatus of the present invention, an air bearing plate facing the surface of the rotary information recording disk and an air bearing surface of the air bearing plate by moving the air bearing plate in the axial direction of the information recording disk. And an adjusting means capable of adjusting the axial gap between the surface of the information recording disk and the fixing means for fixing the air bearing plate in a state where the axial gap is adjusted.

With such a structure, a predetermined amount of axial minute gap can be provided between the disk surface and the air bearing surface, and the vibration of the disk can be reduced. A disc device assembling method of the present invention comprises a rotary information recording disc, an air bearing plate facing the surface of the information recording disc, and a moving means for moving the air bearing plate in the axial direction of the information recording disc. Using the air bearing surface of the air bearing plate and the surface of the information recording disk while measuring the axial gap between them, the axial gap between the two is adjusted by moving means, and when the predetermined gap is reached, the air bearing plate is fixed. It is fixed so as not to move in the axial direction.

By doing so, a predetermined amount of minute gap in the axial direction can be provided between the disk surface and the air bearing surface of the air bearing plate. The disk device of the present invention comprises an air bearing plate facing the surface of the information recording disk, and an air bearing plate mounting portion for mounting the air bearing plate, wherein the air bearing plate is the air bearing plate mounting portion. From the mounting surface of the air bearing plate in the air bearing plate mounting portion after preparing a plurality of different sizes from the mounting surface to the air bearing surface facing the surface of the information recording disk A disk having a dimension such that the axial gap between the air bearing surface and the surface of the information recording disk has a predetermined value corresponding to the distance to the surface of the information recording disk is selectively mounted. It is a thing.

With such a structure, it is possible to provide a predetermined small amount of axial gap between the disk surface and the air bearing surface. The disc device of the present invention comprises an air bearing plate facing the surface of the information recording disc and an air bearing plate mounting portion for mounting the air bearing plate, and the air bearing plate mounting portion of the information recording disc. It is configured to be positionable at any position along the axial direction, the air bearing plate is configured to be removable from the mounting portion,
With the air bearing plate removed from the air bearing plate mounting portion, the distance from the mounting portion to the surface of the information recording disk is measured, and based on the result of measuring the distance, the air It is configured to be positioned at a position such that the axial gap from the air bearing surface of the bearing plate to the surface of the information recording disk has a predetermined value.

With such a structure, it is possible to provide a predetermined small amount of axial gap between the disk surface and the air bearing surface. The disk device of the present invention comprises a plurality of air bearing plates provided at equal angular intervals along the rotation direction of the information recording disk.

With such a structure, it is possible to obtain a disk damping force balanced with respect to the rotation center axis of the information recording disk.

[0025]

DETAILED DESCRIPTION OF THE INVENTION The disk device of the present invention as defined in claim 1 is provided with a dynamic pressure air bearing plate facing the surface of a rotary information recording disk.

According to this, since the dynamic pressure air bearing plate is provided, the distance between the dynamic pressure air bearing plate and the surface of the disc facing the dynamic pressure air bearing plate along the axial direction of the information recording disc is in contact with each other. The disk vibration can be reduced even if the value can be avoided by design and can be industrially manufactured.

According to a second aspect of the present invention, in the disk device of the present invention, the dynamic pressure air bearing plate is provided with an inflow portion of air into the dynamic pressure air bearing plate, and the inflow portion extends along the rotation direction of the disk. The flow channel is narrowed so that the pressure rises.

According to this, even if the axial distance between the dynamic pressure air bearing plate and the disk surface facing the dynamic pressure air bearing plate is such a value that it is possible to avoid contact between the two in terms of design and can be industrially manufactured. The disk vibration can be reduced.

According to a third aspect of the present invention, in the disk device of the present invention, the dynamic pressure air bearing plate is provided with an inflow portion of air into the dynamic pressure air bearing plate, and the inflow portion extends along the rotation direction of the disk. The flow path is widened so that a pressure drop is generated.

According to this, even if the axial distance between the dynamic pressure air bearing plate and the disk surface facing the dynamic pressure air bearing plate is a value at which contact between the two can be avoided by design and can be manufactured industrially. The disk vibration can be reduced.

According to a fourth aspect of the present invention, there is provided a disk device of the present invention, wherein an air bearing plate facing the surface of a rotary information recording disk and the air bearing plate are moved in the axial direction of the information recording disk. There are provided adjusting means for adjusting an axial gap between the air bearing surface of the plate and the surface of the information recording disk, and fixing means for fixing the air bearing plate in a state where the axial gap is adjusted.

According to this, a predetermined amount of axial minute gap can be provided between the disk surface and the air bearing surface, and the vibration of the disk can be reduced. Claim 5
The disk device of the present invention described in (1) has a housing that constitutes the disk device, and the adjusting means includes an air bearing plate in a state where a fitting member provided in the housing and the air bearing plate are fitted to each other. Is configured to be movable in the axial direction of the information recording disk, and an elastic member is provided between the housing and the air bearing plate such that the axial repulsive force acts on the housing and the air bearing plate. And a head seat surface that engages with one of the air bearing plate and the housing including the fitting member by the repulsive force of the elastic member, the air bearing plate, and the fitting member. An adjusting screw having a screw part to be screwed into either the housing or the other is provided, and the air bearing plate can be moved in the axial direction by rotation of the adjusting screw. is there.

According to this, the means for moving the air bearing plate in the axial direction has a simple structure using general-purpose mechanical parts,
It is possible to provide a predetermined amount of minute gaps in the axial direction between the disk surface and the air bearing surface of the air bearing plate, and it is possible to reduce disk vibration.

According to a sixth aspect of the present invention, there is provided a disk device in which the fixing means is configured to fix the air bearing plate by a static frictional force based on the repulsive force of the elastic member.

According to this, the fixing means for the air bearing plate has a simple structure using general-purpose mechanical parts, and a predetermined amount of minute gap in the axial direction is provided between the disk surface and the air bearing surface of the air bearing plate. It is possible to reduce the disk vibration.

In the disk device of the present invention as defined in claim 7, the elastic member is a compression coil spring, a wave washer,
It is made to be one of the disc springs. According to this, the elastic member has a simple structure using general-purpose mechanical parts, and it becomes possible to provide a predetermined amount of minute gap in the axial direction between the disk surface and the air bearing surface of the air bearing plate. Can be reduced.

According to an eighth aspect of the present invention, there is provided a method of assembling a disk device, wherein a rotary information recording disk, an air bearing plate facing the surface of the information recording disk, and the air bearing plate are used for the information recording disk. Using the moving means for moving in the axial direction, while measuring the axial gap between the air bearing surface of the air bearing plate and the surface of the information recording disk, the axial gap between the two is adjusted by the moving means to obtain a predetermined gap. The air bearing plate is fixed so as not to move in the axial direction when the temperature becomes low.

By doing so, a predetermined amount of axial minute gap can be provided between the disk surface and the air bearing surface of the air bearing plate. According to a ninth aspect of the present invention, in the method of assembling the disk device of the present invention, after the air bearing surface is brought into contact with the surface of the information recording disk to make the axial gap between the air bearing surface and the air bearing surface zero, the air bearing plate is removed from the information recording disk. A predetermined amount of axial gap is provided between the two in a direction away from each other.

By doing so, the axial gap between the disk surface and the air bearing surface can be adjusted, and therefore a predetermined amount of axial minute gap can be provided, and disk vibration can be reduced. .

According to a tenth aspect of the present invention, there is provided a method of assembling a disk device, wherein the air bearing is detected by detecting an axial displacement of the information recording disk based on contact between the air bearing surface and the surface of the information recording disk. The contact between the surface and the surface of the disk is detected.

With this arrangement, the contact between the air bearing surface and the disk surface can be detected easily and reliably, and a predetermined small amount of axial gap can be provided, and disk vibration can be reduced.

In the assembling method of the disk device according to the eleventh aspect of the present invention, the moving means is constituted by the screw feeding mechanism, and the air bearing surface and the surface of the information recording disk are determined from the rotation angle of the screw in the screw feeding mechanism. The axial clearance of is calculated.

In this way, the air bearing plate can be moved away from the disc by a predetermined distance in the axial direction by a simple operation of rotating the screw, whereby a predetermined amount of the axial minute gap can be provided. This makes it possible to reduce disk vibration.

According to a twelfth aspect of the present invention, there is provided a method for assembling a disc device, wherein the information recording disc is rotated while being rotated.
By measuring the axial gap between the air bearing surface and the surface of the information recording disk, the rotational position at which the axial gap between the two is minimized is obtained, and the axial gap between the two is adjusted at this rotational position. is there.

By doing so, the gap can be adjusted in a state where the axial gap between the two is minimal, and after the adjustment, it is possible to avoid contact between the two due to axial runout of the disk surface.

According to a thirteenth aspect of the present invention, in the disk device of the present invention, at least a part of the air bearing surface of the air bearing plate facing the surface of the information recording disk is projected more than other parts of the air bearing surface. A protective film is provided to make the axial gap between the air bearing surface in that portion and the surface of the information recording disk narrower than the axial gap in the other portion.

According to this, it is possible to prevent the occurrence of scratches on the disk surface. According to a fourteenth aspect of the present invention, in the disk device of the present invention, the protective film is provided so as to face the outside of the data area on the surface of the information recording disk.

According to this, since the protective film is provided outside the data area on the surface of the disk, it is possible to prevent the data area from being scratched due to the contact between the air bearing surface and the disk.

A disk device according to a fifteenth aspect of the present invention comprises an air bearing plate facing the surface of the information recording disk and an air bearing plate mounting portion for mounting the air bearing plate. A plurality of types of plates having different sizes from the mounting surface to the air bearing plate mounting portion to the air bearing surface facing the surface of the information recording disk are prepared, and the dimension is the air bearing plate mounted. The size is selected such that the axial clearance between the air bearing surface and the surface of the information recording disk has a predetermined value corresponding to the distance from the mounting surface of the air bearing plate to the surface of the information recording disk. It is designed to be installed on the board.

According to this, it becomes possible to provide a predetermined amount of axial minute gap between the disk surface and the air bearing surface, and it is possible to reduce disk vibration. According to a sixteenth aspect of the present invention, there is provided a method for assembling a disk device, wherein the air bearing plate facing the surface of the information recording disk is:
A plurality of types having different sizes from the mounting surface to the air bearing plate mounting portion for mounting the air bearing plate to the air bearing surface facing the surface of the information recording disk are prepared, and the air bearing plate is mounted. The distance from the mounting surface of the air bearing plate in the section to the surface of the information recording disk along the axial direction of the information recording disk, and as the air bearing plate, the dimension corresponds to the result of measuring the distance. The air bearing surface and the surface of the information recording disk are selectively used in such a size that the axial clearance becomes a predetermined value.

By doing so, it becomes possible to provide a predetermined amount of minute gap in the axial direction between the disk surface and the air bearing surface, and it is possible to reduce disk vibration. The method for assembling a disk device according to the present invention according to claim 17, wherein the axial distance between the surface of the information recording disk and the air bearing plate mounting portion is determined by the mounted portion mounted on the air bearing plate mounting portion and the information. It is measured by a displacement meter provided with a displacement sensor facing the surface of the recording disk.

By doing so, the axial dimensional difference between the surface of the information recording disk and the air bearing plate mounting portion can be obtained, and therefore, a predetermined amount of small axial gap between the disk surface and the air bearing plate. Can be provided, and disk vibration can be reduced.

According to the eighteenth aspect of the present invention, in the method of assembling the disk device of the present invention, the air bearing plate mounting portion extends from the mounting surface of the air bearing plate to the surface of the information recording disk along the axial direction of the information recording disk. In addition to measuring the distance, the inclination between the mounting surface and the surface of the information recording disk is also measured.

By doing so, the axial dimensional difference between the surface of the information recording disk and the air bearing plate mounting portion can be obtained including the influence of the inclination, so that the difference between the disk surface and the air bearing plate can be obtained. It is possible to provide a predetermined small amount of axial gap, and it is possible to reduce disk vibration.

According to a nineteenth aspect of the present invention, there is provided a method of assembling a disk device, wherein when measuring the inclination between the mounting surface of the air bearing plate in the air bearing plate mounting portion and the surface of the information recording disk, The inclination of each of the surface and the mounting surface of the air bearing plate in the air bearing plate mounting portion is detected by a laser angle measuring device, and then the relative inclination between them is calculated.

By doing so, the relative inclination between the mounting surface of the air bearing plate in the air bearing plate mounting portion and the surface of the information recording disk can be calculated, and the inclination between the disk surface and the air bearing plate can be calculated. It becomes possible to provide a predetermined amount of minute gaps in the axial direction, so that disk vibration can be reduced.

A disc apparatus according to a twentieth aspect of the present invention comprises an air bearing plate facing the surface of the information recording disc, and an air bearing plate mounting portion for mounting the air bearing plate. The plate mounting portion is configured to be positionable at an arbitrary position along the axial direction of the information recording disk, the air bearing plate is configured to be detachable from the mounting portion, and the air bearing plate mounting portion is With the air bearing plate removed from the mounting portion, the distance from this mounting portion to the surface of the information recording disk was measured, and information was recorded from the air bearing surface of the air bearing plate based on the measured distance. It is configured to be positioned in such a position that the axial gap to the surface of the disk becomes a predetermined value.

According to this, it is possible to adjust the axial dimension difference between the disk surface and the air bearing plate mounting portion, and it is possible to provide a predetermined amount of axial minute gap between the disk surface and the air bearing plate. The disk vibration can be reduced.

According to a twenty-first aspect of the present invention, there is provided a disk device having a positioning means for positioning the air bearing plate mounting portion at an arbitrary position along the axial direction of the information recording disk. The air bearing plate mounting portion is configured to be movable in the axial direction of the information recording disk, with the fitting member and the air bearing plate mounting portion provided in the housing configuring the disk device fitted to each other. An elastic member is provided between the housing and the air bearing plate mounting portion so that the housing and the air bearing plate mounting portion act on the axial repulsion force. A head seat surface that engages with either one of the air bearing plate mounting portion and the housing including the fitting member, and the other one of the air bearing plate mounting portion and the housing including the fitting member Screw screwed to Preparative provided with adjustment screw having a
The air bearing plate mounting portion is moved in the axial direction by the rotation of the adjusting screw so that the air bearing plate mounting portion can be positioned.

According to this, the mechanism for positioning the air bearing plate in the axial direction can be made to have a simple structure using general-purpose mechanical components, whereby a space between the disk surface and the air bearing plate can be obtained. It is possible to provide a predetermined amount of minute gaps in the axial direction, and it is possible to reduce disk vibration.

According to a twenty-second aspect of the present invention, a disk device is constructed such that the air bearing plate mounting portion is positioned and fixed by the static frictional force based on the repulsive force of the elastic member.

According to this, the means for positioning and fixing the air bearing plate can have a simple structure using general-purpose mechanical parts, and a predetermined amount of axial direction can be provided between the disk surface and the air bearing plate. It is possible to provide a minute gap and reduce disk vibration.

According to a twenty-third aspect of the present invention, there is provided a method for assembling a disk device, wherein an air bearing plate mounting portion for mounting an air bearing plate facing a surface of a rotary information recording disk is provided on the information recording disk. The information recording disk can be positioned in any position along the axial direction, and the air bearing plate can be attached to and detached from the mounting portion with the air bearing plate removed from the mounting portion. While measuring the distance to the surface of the air bearing plate, the position of the air bearing plate mounting portion is changed, and at this position, the axial gap from the air bearing surface of the air bearing plate to the surface of the information recording disk becomes a predetermined value. When such a position is reached, the air bearing plate mounting portion is positioned.

By doing so, it becomes possible to adjust the axial dimensional difference between the surface of the disc and the air bearing plate mounting portion, and it is possible to provide a predetermined amount of minute axial gap between the disc surface and the air bearing plate. Therefore, the vibration of the disk can be reduced.

According to a twenty-fourth aspect of the present invention, there is provided a method of assembling a disk device, wherein an air bearing plate mounting portion for mounting an air bearing plate facing a surface of a rotary information recording disk is provided on the information recording disk. The information recording disk can be positioned in any position along the axial direction, and the air bearing plate can be attached to and detached from the mounting portion with the air bearing plate removed from the mounting portion. The distance to the surface of the air bearing plate, and then based on the result of measuring the distance, at a position such that the axial gap from the air bearing surface of the air bearing plate to the surface of the information recording disk has a predetermined value, The air bearing plate mounting portion is positioned.

By doing so, it becomes possible to adjust the dimensional difference in the axial direction between the surface of the disk and the air bearing plate mounting portion, and it is possible to provide a predetermined small amount of axial gap between the disk surface and the air bearing plate. Therefore, the vibration of the disk can be reduced.

According to a twenty-fifth aspect of the present invention, there is provided a method for assembling a disk device, wherein the information recording disk is rotated.
By measuring the deflection of the surface of the information recording disc, when the air bearing plate is mounted on the mounting portion, the rotational position where the axial gap from the air bearing surface of the air bearing plate to the surface of the information recording disc is minimized is determined. In search of this rotational position,
The air bearing plate mounting portion is axially positioned.

By doing so, the gap can be adjusted in a state in which the axial gap from the air bearing surface of the air bearing plate to the surface of the information recording disk is minimized. Therefore, after the adjustment, the axis of the disk surface is adjusted. It is possible to avoid contact between the air bearing plate and the information recording disk due to directional surface runout.

According to a twenty-sixth aspect of the present invention, a plurality of air bearing plates are provided at equal angular intervals along the rotation direction of the information recording disk. According to this
It is possible to obtain a disc damping force that is balanced about the rotation center axis of the information recording disc, and thus suppress vibration displacement in a vibration mode in which the disc vibration is large.

In the disk device of the present invention as set forth in claim 27, the air bearing plate is constituted by a squeeze air bearing plate or a dynamic pressure air bearing plate. According to this, the disk vibration can be reduced.

FIG. 1 shows the embodiment of the present invention.
~ It demonstrates using FIG. (Embodiment 1) FIG. 1 is a diagram showing a structure of an air bearing plate in a magnetic disk device according to Embodiment 1 of the present invention. The magnetic disk device shown in FIG.
A PM 5 is provided, and a plurality of disks 1 are mounted on the spindle hub 2 of the SPM 5 via a spacer 7 using a clamp 3 and a clamp screw 4. The process up to this point is the same as that of a general magnetic disk device.

A structural feature of the magnetic disk drive according to the first embodiment of the present invention is that the dynamic pressure air bearing plate 12 is installed opposite to the surface of the disk 1 with a minute axial gap. . The dynamic pressure air bearing surface 12a of the dynamic pressure air bearing plate 12 is provided with a dynamic pressure groove 12b.
The dynamic pressure air bearing plate 12 is attached to the housing 43, and a pair is provided so as to face the surface of the uppermost disk 1 and the surface of the lowermost disk 1. In FIG. 1, the air bearing surface 12a facing the disk 1 at the lowermost surface is provided integrally with the housing 43, but it may have a different structure. The dynamic pressure air bearing plate 12 is
It may be provided so as to face the surface of any of the disks 1.

As shown in detail in FIG. 1B, the dynamic pressure air bearing surface 12a is formed by a wedge-shaped dynamic pressure groove 12b. Although not shown in FIG. 1, the dynamic pressure air bearing surface 12a may be provided on the cover facing the surface of the disk 1.

The operation and effect of the dynamic pressure air bearing plate 12 will be described below. An air flow is generated in the vicinity of the disk 1 due to the rotation of the disk 1, and the dynamic pressure generated in the dynamic pressure groove 12b by the pumping action presses the disk 1. Therefore, the rigidity of the spindle system including the disk 1 is increased and the disk vibration is reduced. Dynamic pressure groove 12b
A larger dynamic pressure can be generated by increasing the shape and depth of, and a larger damping force than that of the conventional squeeze air bearing plate can be obtained. The optimum shape of the dynamic pressure groove 12b for obtaining such a larger damping force can also be obtained by means such as computer simulation. As a result, contact between the surface of the disk 1 and the dynamic pressure air bearing surface 12a can be avoided by design, and disk vibration can be reduced with a structure that can be industrially manufactured to achieve high density. A magnetic disk device can be provided.

(Second Embodiment) FIG. 2 is a diagram showing a dynamic pressure air bearing plate in a magnetic disk device according to a second embodiment of the present invention. In the second embodiment shown in FIG. 2, similarly to the magnetic disk device in the above-described first embodiment,
A dynamic pressure air bearing plate 12 is installed to face the surface of the disk 1 with a minute gap in the axial direction, and an air flow path 1 is provided between the dynamic pressure air bearing plate 12 and the surface of the disk 1.
2e is formed. The dynamic pressure air bearing surface 12a of the dynamic pressure air bearing plate 12 is provided with a recess 12c. The dynamic pressure air bearing plate 12 may be provided so as to face the surface of any of the disks 1.

FIG. 2B shows the side of the dynamic pressure air bearing plate 12 facing the surface of the disk 1, that is, the air bearing surface 1.
2a is a view as seen from the side of FIG.
The traveling direction of the air flow in 2c is indicated by an arrow. The air flow due to the rotation of the disk 1 flows from the inflow portion 12d of the recess 12c shown in FIG. 7B into the flow passage 12e shown in FIG. As shown in FIG. 3B, the recess 12c is formed so that the plane area of the recess 12c becomes smaller along the traveling direction of the air flow. Then, in response to this, the flow path 12e
Is gradually getting smaller.

In FIG. 2 (c), contrary to FIG. 2 (b), the plane area of the recess 12c is increased along the direction of air flow. Then, in response to this, the flow path 12e is gradually increased.

The operation and effect of the dynamic pressure air bearing plate 12 shown in FIG. 2 will be described below. That is, the airflow accompanying the rotation of the disk 1 is not the concave portion 12c
From the inflow portion 12d to the flow path 12e. Same figure
In the case of the dynamic pressure bearing plate 12 shown in (b), the plane area of the recess 12c provided in the air bearing surface 12a becomes smaller, so that the flow passage 12e becomes smaller. As a result, the pressure in the vicinity of the terminal end 12f of the recess 12c increases, and the disc 1 is pressed down. Therefore, the rigidity of the spindle system including the disk 1 is increased and the disk vibration is reduced. On the other hand, in the case of the dynamic pressure bearing plate 12 shown in FIG. 7C, the flow passage 12e becomes large due to the increase in the plane area of the recess 12c provided in the air bearing surface 12a. As a result, the pressure in the vicinity of the terminal end 12f of the recess 12c is lowered, and the disc 1 is sucked. This allows
The rigidity of the spindle system including the disk 1 is increased and the disk vibration is reduced.

A larger dynamic pressure can be generated by increasing the shape and depth of the dynamic pressure groove 12b, and a greater damping force than that of the conventional squeeze air bearing plate can be obtained. As a result, it is possible to avoid contact between the surface of the disk 1 and the dynamic pressure air bearing surface 12a by design, reduce the disk vibration by a value that can be industrially manufactured, and realize a high density magnetic field. A disk device can be provided.

In the air bearing plate 12 shown in FIGS. 2 (b) and 2 (c), the flow path 12e can be obtained by making the plane shape of the recess 12f smaller or larger along the traveling direction of the air flow. Was widened or narrowed, but
Even if the depth of f is changed, the channel 12e can be widened or narrowed similarly. Alternatively, the flow passage 12e may be widened or narrowed by inclining the air bearing surface 12a in the traveling direction of the air flow without providing the recess 12f.

The dynamic pressure air bearing surface 12a may be provided on the housing 43 or the cover facing the disk 1. (Third Embodiment) FIG. 3 is a view showing an air bearing plate in a magnetic disk device according to a third embodiment of the present invention. The magnetic disk device shown in FIG.
A plurality of disks 1 are mounted on the spindle hub 2 of the SPM 5 via the spacer 7 by using the clamp 3 with the M5. The process up to this point is the same as that of a general magnetic disk device.

Structural features of the magnetic disk drive according to the third embodiment of the present invention will be described below. Here, an air bearing plate 10 having an air bearing surface 10a facing the surface of the disk 1 is provided. That is, the shaft 9 provided in the housing 43 is fitted into the hole 10b of the air bearing plate 10 having the sleeve 10c, and the housing 43 and the sleeve 1 of the air bearing plate 10 around the shaft 9 are fitted.
An elastic member 8 such as a compression coil spring is provided between 0 and 0c. Then, the axial force of the head seat surface 11a of the screw 11 screwed to the center of the shaft 9 from the end face side and the axial repulsive force from the elastic member 8 are balanced to hold the air bearing plate 10. The air bearing plate 10 is fitted in the shaft 9 without looseness so that the shaft 9 can be smoothly moved in the axial direction, and can be moved in the axial direction of the shaft 9 by rotating a screw 11. In FIG. 3, the elastic member 8 is a compression coil spring as described above, but may be a wave washer, a disc spring, or the like.

Next, a method of assembling the magnetic disk device according to the third embodiment of the present invention will be described. That is, while measuring the axial gap between the air bearing surface 10a and the surface of the disk 1, the screw 11 is rotated to rotate the air bearing surface 10a.
And the axial clearance between the surface of the disk 1 and
The rotation of the screw 11 is stopped when the predetermined gap is reached.
Thereby, the screw 11 due to the axial repulsive force of the elastic member 8
The air bearing plate 10 can be kept stationary by the static frictional force between the shaft bearing 9 and the shaft 9 and the static frictional force between the head bearing surface 11a and the air bearing plate 10. A static frictional force capable of maintaining a static state even against a disturbance such as vibration or shock is calculated, and an axial repulsive force of the elastic member 8 is calculated from the static frictional force to calculate the spring constant and the compression amount of the elastic member 8. Just set it.

The axial clearance between the air bearing surface 10a and the surface of the disk 1 is the inclination and axial surface deflection of the disk 1, the inclination of the air bearing plate 10, the disk 1 and the air bearing plate 10 and the housing during vibration and impact. Considering the deformation of the body 43,
It may be provided so that they do not contact each other.

When it is difficult to directly measure the axial gap between the air bearing surface 10a and the surface of the disk 1, the axial distance between the surface of the disk 1 and the back surface 10f of the air bearing plate 10 is measured to determine the air gap. By subtracting the thickness T of the bearing plate 10, the axial clearance can be obtained. The thickness T may be measured for each air bearing plate 10, that is, for each individual, but a processing error of the thickness T is tens of μm without an increase in processing cost.
Since it is easy to set the value below, the maximum allowable value of the design value may be referred to as the thickness T, and in that case,
The error due to this is several tens of μm or less.

The operation and effect of the air bearing plate 10 of the third embodiment will be described below. The axial gap between the surface of the disk 1 and the air bearing surface 10a can be adjusted,
Further, the moving means and the fixing means in the axial direction of the air bearing plate 10 can be made simple by using a simple structure using general-purpose mechanical parts such as the screw 11, the elastic member such as the compression coil spring 8 and the shaft 9. It is possible to provide a predetermined amount of minute gaps in the axial direction by various operations. As a result, it is possible to provide a magnetic disk device that can reduce disk vibration and achieve high density.

FIG. 4 is a sectional view showing another example of the magnetic disk device according to the third embodiment of the present invention. In the magnetic disk device shown in FIG. 4, the air bearing plate 10 is opposed to the lowermost disk 1 from below. Also in this case,
A structure and an assembling method similar to those of the magnetic disk device shown in FIG. 3 can be used. However, in this case, the structure for moving the air bearing plate 10 in the axial direction and the structure for fixing the same are the same as those of the magnetic disk device shown in FIG. 3, but the disk 1 and the air bearing surface are The method for adjusting the axial clearance with 10a is different.

That is, when there are a plurality of disks 1, it is difficult to accurately measure the axial gap between the lowermost disk 1 and the air bearing surface 10a after the plurality of disks 1 are stacked. Therefore, with only one disk 1 mounted, the axial gap between the two is measured and the axial gap is adjusted.

Specifically, as shown in FIG. 4 (a), only one disk 1 is mounted, and the dummy spacer 13 and the clamp 3 are used to bring the disk 1 into close contact with the disk receiving surface 2c of the spindle hub 2. As a result, it is possible to eliminate the influence of the inclination of the disk receiving surface 2c when adjusting the axial clearance between the disk 1 and the surface of the air bearing plate 10, that is, the air bearing surface 10a. It is possible to improve the accuracy of measuring the axial clearance. A sensor 15 measures an axial distance between the upper surface of the disk 1 and the upper surface of the air bearing surface 10a. By subtracting the thickness D of the disk 1 from the measurement result, the axial gap between the disk 1 and the air bearing surface 10a can be obtained. The thickness D may be measured for each disk 1, that is, for each individual, but since the processing error of the thickness D is several tens of μm, the maximum allowable design value may be referred to as the thickness D, Even in that case, the error due to this is several tens of μm or less.

FIG. 4B shows an example in which the ring-shaped magnet 14 is used to bring the disc 1 into close contact with the disc receiving surface 2c of the spindle hub 2. This configuration can be applied when the spindle hub 2 is made of a ferromagnetic material. Compared with the one shown in FIG. 4 (a), it is possible to omit the trouble of tightening the screw 4.

When there are a plurality of discs 1, a hole into which a sensor for measuring an axial gap between the lowermost disc 1 and the corresponding air bearing surface 10a can be inserted is formed in the housing 43.
It is also possible to measure the axial gap between the two discs 1 by stacking the above-mentioned plurality of discs 1 and then using this sensor.

FIG. 5 is a sectional view showing still another example of the magnetic disk device according to the third embodiment of the present invention. The magnetic disk device shown in FIG. 5 is provided with an air bearing plate 10 facing the surface of the disk 1 as in the magnetic disk device shown in FIG. In FIG. 5 (a), the convex portion of the air bearing plate 10, that is, the sleeve 10c is fitted in the hole 43b provided on the upper surface of the housing 43, and the housing 43 and the sleeve 10c are fitted in the hole 43b. Is the elastic member 8
Is provided, and the axial force of the screw 11 screwed into the housing 43 and the axial repulsive force from the elastic member 8 are balanced to hold the air bearing plate 10. The sleeve 10c of the air bearing plate 10 is fitted in the hole 43b without looseness so as to be smoothly moved in the axial direction, and is movable in the axial direction by rotating the screw 11.

In FIG. 5 (b), the convex portion of the air bearing plate 10, that is, the sleeve 10c is fitted into the hole 43b provided in the housing 43, and the housing 43 and the air bearing plate 10 are elastic. The member 8 is provided, the axial force of the screw 11 screwed into the air bearing plate 10 after penetrating the housing 43 and the axial repulsive force from the elastic member 8 are balanced to hold the air bearing plate 10. ing. The sleeve 10c of the air bearing plate 10 is fitted in the hole 43b without looseness so as to be smoothly moved in the axial direction, and is movable in the axial direction by rotating the screw 11.

The magnetic disk device shown in FIGS. 5 (a) and 5 (b) uses an assembly method similar to that of the magnetic disk device shown in FIG. 3, and the shaft between the surface of the disk 1 and the air bearing surface 10a is used. The directional gap can be adjusted.

In FIGS. 4 and 5, the rotation of the air bearing plate 10 with respect to the shaft 9 and the housing 43 may be prevented by using a structure such as a key groove and a key fitted into the key groove. Also in the magnetic disk device shown in FIGS. 4 and 5, the same operation and effect as those of the magnetic disk device shown in FIG. 3 can be obtained.

(Embodiment 4) FIG. 6 is a diagram showing an air bearing plate in a magnetic disk device according to Embodiment 4 of the present invention. The structure of the magnetic disk device shown in FIG.
This is similar to the magnetic disk device shown in FIG. Therefore,
Detailed description thereof will be omitted. Here, the air bearing plate 10 is provided in the housing 43 so that the air bearing surface 10 a faces the surface of the disk 1. The air bearing plate 10 is
The shaft 9 and the hole 10b are fitted with each other without backlash, and the elastic member 8
The screw 11 can be moved in the axial direction by the rotation of the screw 11 while being held by the axial repulsive force.

The magnetic disk drive shown in FIG. 6 is characterized in that the axial gap between the surface of the disk 1 and the air bearing surface 10a of the air bearing plate 10 facing the disk 1 can be adjusted, and a predetermined amount is provided between them. The point is that a minute gap can be formed in the axial direction. This point will be described below. First, as shown in FIG. 3A, the screw 11 is rotated to rotate the air bearing surface 10a.
And the axial clearance between the surface of the disk 1 and
The axial gap between them is set to zero. That is, the air bearing surface 1
0a and the surface of the disk 1 are brought into contact with each other. When detecting the contact between the two, the dust clearance may be reduced while measuring the axial clearance. However, as shown in FIG. Alternatively, the change in displacement of the surface of the disk 1 that occurs when the two come into contact with each other may be detected.

After that, as shown in FIG.
To rotate the air bearing surface 10a to the disk 1
An axial gap of a predetermined amount L is formed between the two in the axial direction. At this time, screw 11
Since the groove pitch P of is constant, the rotation angle α of the screw 11
There is a relationship of L = P × α / 360 between (°) and the axial movement amount L of the screw 11 and the air bearing plate 10. As a result, after the air bearing surface 10a and the surface of the disk 1 come into contact with each other, an axial gap L is formed between them.
The required rotation angle of the screw 11 for forming the can be obtained.

The operation and effect of the magnetic disk device shown in FIG. 6 is that the axial gap between the surface of the disk 1 and the air bearing surface 10a of the air bearing plate 10 can be adjusted as in the third embodiment. As a result, it is possible to form the axial minute gap of a predetermined amount L by a simple operation. As a result, it is possible to provide a magnetic disk device that can reduce disk vibration and achieve high density.

(Fifth Embodiment) FIG. 7 is a sectional view showing an air bearing plate in a magnetic disk device according to a fifth embodiment of the present invention. Since the structure of the magnetic disk device shown in FIG. 7 is similar to that of the magnetic disk device shown in FIG.
Detailed description thereof will be omitted. Here, the air bearing plate 10 is provided in the housing 43 so that the air bearing surface 10 a faces the surface of the disk 1. The air bearing plate 10 is
The shaft 9 and the hole 10b are fitted with each other without backlash, and the elastic member 8
The screw 11 can be moved in the axial direction by the rotation of the screw 11 while being held by the axial repulsive force.

The magnetic disk device shown in FIG. 7 is characterized in that a means for providing a predetermined small amount of axial gap between the surface of the disk 1 and the air bearing surface 10a of the air bearing plate 10 facing the surface of the disk 1. It is in. This will be explained below. That is, in FIG. 7, the axial runout of the disk 1 is measured while slowly rotating the SPM 5. Then, the SPM 5 is stopped at the rotational position of the SPM 5 so that the gap between the air bearing surface 10a and the disk 1 is minimized, and in this state, the SPM 5 is stopped between the surface of the disk 1 and the air bearing surface 10a facing the surface. A predetermined amount of microscopic gap is provided. As a means for providing a predetermined amount of axial minute gap between the two, the means described in the third and fourth embodiments can be used, and therefore detailed description thereof will be omitted.

The operation and effect of the air bearing plate 10 will be described below. That is, if this gap is adjusted in a state where the axial gap between the surface of the disk 1 and the air bearing surface 10a facing it is minimized, after the adjustment, both due to axial runout of the surface of the disk 1 It is possible to avoid contact with. Therefore, it is possible to provide a highly reliable magnetic disk device that can reduce disk vibration and realize high density.

(Sixth Embodiment) FIG. 8 is a sectional view showing an air bearing plate in a magnetic disk device according to a sixth embodiment of the present invention. The structure of the magnetic disk device shown in FIG. 8 is similar to the structure of the magnetic disk device of the third embodiment shown in FIG. Therefore, detailed description is omitted except for the structure related to the feature.

Here, the air bearing plate 10 is arranged so that the air bearing surface 10a faces the surface of the disk 1.
It is provided in. The air bearing plate 10 includes a shaft 9 and a hole 1.
0b and 0b are fitted with each other without backlash, and can be moved in the axial direction by rotation of the screw 11 while being held by the axial repulsive force of the elastic member 8. And here, disk 1
The air bearing surface 1 facing the surface of the disk 1 on at least a part of the air bearing surface 10a facing the surface of the disk 1.
The protective film 16 is provided so as to protrude more than other portions of the disk 0a so that the axial gap with the disk 1 becomes narrower. This protective film 16
Is preferably made of a resin such as polyimide and is provided so as to face an area other than the data area on the surface of the disk 1.

The action and effect of the protective film 16 will be described below. In the case of assembling, particularly when a predetermined amount of axial gap is provided after bringing the surface of the disk 1 into contact with the air bearing surface 10a opposed thereto to zero the axial gap as described in the fourth embodiment. As described above, the two always contact each other. Further, since the axial gap between the two is set to be small, it is possible that the two come into contact with each other due to a disturbance such as a vibration impact during use.

However, with the structure shown in FIG. 8, even if they come into contact with each other, the protective film 16 makes it difficult for the surface of the disk 1 to be scratched. Further, when the protective film 16 is provided so as to face the area other than the data area on the surface of the disk 1 as described above, even if contact occurs between them, it is outside the data area, and therefore data damage or the like occurs. It is possible to avoid a fatal situation.

As described above, the air bearing plate 10 facing the surface of the disk 1 is provided to reduce the vibration of the disk 1 and it is possible to provide a highly reliable magnetic disk device capable of realizing high density.

(Embodiment 7) FIGS. 9 and 10 are views showing an air bearing plate in a magnetic disk device according to Embodiment 7 of the present invention. Here, the air bearing plate 1 is arranged so that the air bearing surface 10a faces the surface of the disk 1.
0 is provided in the housing 43. The features of the magnetic disk device shown in FIGS. 9 and 10 relate to a method of assembling the air bearing plate 10, and the details thereof will be described below.

FIG. 10 shows the air bearing plate 10. As the air bearing plate 10, the mounting surface 10 from the air bearing surface 10a to the air bearing plate mounting surface 43a of the housing 43 is used.
Plural types having different axial distances H to e are prepared.

FIG. 9 (b) shows the state before the air bearing plate 10 is attached.
The axial distance between the surface of the air bearing plate and the air bearing plate mounting surface 43a is measured. And from this measurement result, the air bearing plate 1
0 mounting surface 10e from the air bearing surface 10a so that when the mounting surface 10e is mounted on the air bearing plate mounting surface 43a, a predetermined amount of axial gap is formed between the surface of the disk 1 and the air bearing surface 10a. It is possible to determine what the axial distance H up to is. The air bearing plate 10 provided with the predetermined axial distance H thus obtained is selected and attached to the housing 43. As the relative displacement sensor 17, it is possible to use one having a mounted portion mounted on the air bearing plate mounting surface 43a as an air bearing plate mounting portion and a displacement sensor facing the surface of the disk 1. .

The plurality of types of air bearing plates 10 are designed such that the surface of the disk 1 and the air bearing plate mounting surface 43 which may occur.
The maximum value and the minimum value of the axial distance H are set so that a predetermined amount of axial gap can be provided between the surface of the disk 1 and the air bearing surface 10a in accordance with the axial distance from a. It should have been done. A plurality of types of the air bearing plate 10 are prepared so that the axial distance H from the air bearing surface 10a to the mounting surface 10e changes by a constant value. The constant value depends on the surface of the disk 1 and the air. It may be set to a value that can correspond to the specification of the allowable variation value of the predetermined amount of axial clearance formed between the bearing surface 10a.

In FIG. 9C, the relative displacement sensor 17 described above is used.
In addition, the angle sensor 27 is used to measure the axial distance and the angle between the surface of the disk 1 and the air bearing plate mounting surface 43a. From this measurement result, the air bearing plate 10
In order to set a predetermined amount of axial clearance between the surface of the disk 1 and the air bearing surface 10a when the mounting surface 10e of the above is attached to the air bearing plate mounting surface 43a, the air bearing surface 1
The axial distance H from 0a to the mounting surface 10e can be obtained, and the relative angle between them, that is, the parallelism is measured as described above, so that the surface of the disk 1 and the air bearing surface 10a can be more accurately measured. A predetermined amount of axial clearance can be set between the two.

As the angle sensor 27, it is possible to use a laser angle measuring device or the like for detecting the inclinations of the surface of the disk 1 and the air bearing plate mounting surface 43a.
Then, from the detection result of the angle sensor 27, the relative inclination between the two can be calculated.

The action and effect of this air bearing plate 10 are also the same as those in the third embodiment, and the axial gap between the surface of the disk 1 and the air bearing surface 10a of the air bearing plate 10 can be adjusted. It becomes possible to provide a predetermined amount of minute gaps in the axial direction with a simple operation. As a result, it is possible to provide a magnetic disk device that can reduce disk vibration and achieve high density.

(Embodiment 8) FIGS. 11 and 12 show
It is the figure which showed the attachment structure of the air bearing plate in the magnetic disc apparatus which concerns on Embodiment 8 of this invention. Here, as shown in FIG. 11A, the air bearing plate 10 facing the surface of the disc 1 is a cylindrical air bearing plate mounting portion 1.
8 is fitted to the outside, and this air bearing plate mounting portion 1
Flange structure air bearing plate mounting surface 1
8a is attached using a nut 19 that is screwed into a screw portion 18c formed at the tip of the tubular air bearing plate mounting portion 18. Further, the hole 4 provided in the housing 43
3b, the lower portion 18b of the air bearing plate mounting portion 18 is fitted,
The elastic member 8 is provided between the bottom portion of the hole 43b and the lower end surface of the lower portion 18b, and the axial force of the screw 11 tightened to the housing 43 through the central portion of the air bearing plate mounting portion 18 and the elastic member 8 are provided.
The air bearing plate mounting portion 18 is held by being balanced with the axial repulsion force from. Air bearing plate mounting part 18
Can be actually moved in the axial direction by loosely fitting the lower portion 18b into the hole 43b so as to allow smooth movement in the axial direction and rotating the screw 11. Although the elastic member 8 is illustrated as a wave washer in FIG. 11A, it may be a compression coil spring or a disc spring.

Next, a method of assembling the magnetic disk device having the above structure will be described. First, as shown in FIG. 11 (b),
While measuring the axial distance between the air bearing plate mounting surface 18a and the surface of the disk 1 with the relative displacement sensor 17, the screw 11
By rotating the air bearing plate mounting surface 18a and the disk 1
The axial distance from the surface of the screw is changed, and when the predetermined axial distance is reached, the rotation of the screw 11 is stopped. Alternatively, after measuring the axial distance between the air bearing plate mounting surface 18a and the surface of the disk 1, the air bearing plate mounting surface 18a
The rotation angle of the screw 11 obtained from the groove pitch of the screw 11 is calculated from the axial movement distance required for the axial distance between the disk 1 and the surface of the disk 1 to reach a predetermined value.
You may rotate this screw 11.

Next, as shown in FIG. 11 (a), the nut 1
9 is used to attach the air bearing plate 10 to the air bearing plate mounting surface 18a. In this attached state, the elastic member 8
The air bearing plate mounting portion 18 is in a stationary state due to the static frictional force between the screw 11 and the housing 43 and the static frictional force between the head bearing surface 11 a of the screw 11 and the air bearing plate mounting portion 18 due to the axial repulsive force of the air bearing plate mounting portion 18. It is possible to keep Here, a static frictional force capable of maintaining a static state even against a disturbance such as a vibration impact is calculated, and an axial repulsive force of the elastic member 8 is calculated from this, and a spring constant of the elastic member 8 or The compression amount may be set.

Air bearing plate mounting surface 18a and disk 1
The axial distance from the surface of the disk 1 may be set so that the axial gap between the air bearing surface 10a and the surface of the disk 1 becomes a predetermined amount when the air bearing plate 10 is mounted. The axial clearance between the air bearing surface 10a and the surface of the disk 1 is such that the disk 1 is tilted and axially deflected, the air bearing plate 10 is tilted, and the disk 1 and the air bearing plate 10 and the housing 43 during vibration / impact. In consideration of deformation and the like, it may be provided so that the disk 1 and the air bearing plate 10 do not come into contact with each other.

By using an angle sensor (not shown) in addition to the relative displacement sensor 17, not only the axial distance between the surface of the disk 1 and the air bearing plate mounting surface 18a,
By measuring the angle between the two, that is, the relative inclination between the two, that is, the parallelism between the two, it is possible to more accurately provide a predetermined amount of axial gap between the surface of the disk 1 and the air bearing surface 10a.

Air bearing plate mounting surface 18a and disk 1
The adjustment of the axial distance from the surface may be performed by the method described in the fifth embodiment. That is, the axial runout of the disk 1 is measured while slowly rotating the SPM,
When the air bearing plate 10 is mounted, its air bearing surface 1
0a and the surface of the disk 1 are stopped at the rotational position of the SPM so as to minimize the axial gap between them, and in this state, a predetermined amount of axial direction is provided between the air bearing plate mounting surface 18a and the surface of the disk 1. A distance may be provided.

The operation and effect of the air bearing plate mounting portion 18 will be described below. By adjusting the axial distance between the surface of the disk 1 and the air bearing plate mounting surface 18a, the axial gap between the two can be adjusted, and further, the means for moving the air bearing plate mounting portion 18 in the axial direction and The fixing means is a screw 11 or an elastic member 8 such as a wave washer or a hole 43.
By adopting a simple structure using general-purpose mechanical parts such as b, it becomes possible to provide a predetermined amount of minute gaps in the axial direction by a simple operation. As a result, it is possible to provide a magnetic disk device that can reduce disk vibration and achieve high density.

11 (c) and 11 (d) are sectional views showing a modification of the mounting structure of the air bearing plate in the magnetic disk device according to the eighth embodiment of the present invention. The air bearing plate mounting structure shown in FIGS. 11 (c) and 11 (d) is similar to that shown in FIG. 11 (a), and only the location where the elastic member 8 is provided is different. The same applies to the assembling method, operation, and effect.

FIG. 11 (e) is a sectional view showing another modified example of the air bearing plate mounting structure in the magnetic disk device according to the eighth embodiment of the present invention. The mounting structure of the air bearing plate shown in FIG. 11 (e) is similar to that shown in FIG. 11 (a), but the differences are as follows. That is, here, the screw 11 for moving the air bearing plate mounting portion 18 in the axial direction is provided outside the space surrounded by the housing 43 and in which the magnetic head (not shown) and the disk 1 are mounted. There is. A screw 20 is used instead of the nut 19 as a means for fixing the air bearing plate 10 to the air bearing plate mounting portion 18.

FIG. 12 is a sectional view showing still another modified example of the mounting structure of the air bearing plate in the magnetic disk device according to the eighth embodiment of the present invention. The air bearing plate mounting structure shown in FIG. 12 differs from that shown in FIG. 11 in the following points. That is, the means for providing a predetermined amount of axial distance between the air bearing plate mounting surface 18a and the surface of the disk 1 is different. Specifically, an air bearing plate type displacement sensor 21 is mounted on the air bearing plate mounting surface 18a, and the screw 11 is rotated while measuring the axial distance between the displacement sensor 21 and the surface of the disk 1. A predetermined amount of axial gap is provided between the displacement sensor 21 and the surface of the disk 1.

The displacement sensor 21 of the air bearing plate type has the same outer shape as the air bearing plate 10, and the sensor 15 is built in on the surface facing the disk 1. The mounting position of the sensor 15 to the air bearing plate type displacement sensor 21 is determined by the axial distance to the disc 1 when the air bearing plate type displacement sensor 21 is mounted on the air bearing plate mounting surface 18a.
The position is set to be equal to the axial distance from the disc 1 to the air bearing surface 10a when the air bearing plate 10 is mounted on the air bearing plate mounting surface 18a.

FIG. 12A shows a sectional view when the air bearing plate type displacement sensor 21 is mounted, and FIG. 12B shows a sectional view when the air bearing plate 10 is attached. According to such a configuration, not only the distance in the axial direction between the air bearing plate mounting surface 18a and the surface of the disk 1 but also the influence of the parallelism is more accurately included, and the surface of the disk 1 and the air bearing surface 10 are more accurate.
An axial gap of a predetermined amount L can be provided between a and a.

(Ninth Embodiment) FIG. 13 is a cross-sectional view showing vibration modes of the SPM and the disk in the magnetic disk device. In the magnetic disk device, the disk 1
The vibration modes that adversely affect the follow-up of the magnetic head (not shown) to the data track of are (0, 0) mode
It is the (0, 1) mode. 13A shows the (0,0) mode of the SPM and the disk in the magnetic disk device, and FIG. 13B shows the (0,1) mode. The SPM 5 and the disk 1 vibrate as indicated by arrows in the figure.
FIG. 13C shows an air bearing plate 1 in the magnetic disk device.
3 is a cross-sectional view showing a vibration damping effect when 0 is provided at one location along the circumferential direction of the disc 1. FIG. However, since the rotating shaft 5a at the central portion of the SPM 5 is supported by the bearing 5b, if the air bearing plate 10 is provided at only one location along the circumferential direction of the disk 1 as described above, the vibration is completely suppressed. It is not possible.

FIG. 14 shows a magnetic disk device according to the ninth embodiment of the present invention. Here, the air bearing plate 10 is S
The PM 5 is provided at two locations symmetrical with respect to the rotation center axis 5c. It should be noted that the SPM does not have to be in such two places.
It may be provided at a plurality of positions at equal angular intervals around the rotation center axis 5c of the No. 5 center.

With such a structure, the air bearing plate 1
Since 0 is provided at two locations symmetrically with respect to the rotation center axis 5c of the SPM 5, the damping force of the air bearing plate 10 is balanced around the rotation center axis 5c, which makes the SPM 5 and the disk 1 more effective. Can be controlled by. Therefore, it is possible to provide a magnetic disk device capable of reducing the vibration of the disk and realizing high density.

In the first to ninth embodiments described above, the number of disks 1 may be one or more. Further, in the above-described third to ninth embodiments, the air bearing plate 10 can use a squeeze air bearing plate or a dynamic pressure bearing plate.

[0131]

As described above, according to the present invention, the air bearing plate facing the disk surface can reduce the disk vibration due to the air exciting force and the like accompanying the high speed disk rotation, and the high recording density can be achieved. Can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of a dynamic pressure air bearing plate in a magnetic disk device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a dynamic pressure air bearing plate in a magnetic disk device according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing an air bearing plate in a magnetic disk device according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing another example of the magnetic disk device according to the third embodiment of the present invention.

FIG. 5 is a sectional view showing still another example of the magnetic disk device according to the third embodiment of the present invention.

FIG. 6 is a sectional view showing an air bearing plate in a magnetic disk device according to a fourth embodiment of the present invention.

FIG. 7 is a sectional view showing an air bearing plate in a magnetic disk device according to a fifth embodiment of the present invention.

FIG. 8 is a sectional view showing an air bearing plate in a magnetic disk device according to a sixth embodiment of the present invention.

FIG. 9 is a sectional view showing an air bearing plate in a magnetic disk device according to a seventh embodiment of the present invention.

FIG. 10 is a sectional view of an air bearing plate according to a seventh embodiment of the present invention.

FIG. 11 is a sectional view showing an air bearing plate mounting structure in a magnetic disk device according to an eighth embodiment of the present invention.

FIG. 12 is a sectional view showing an air bearing plate mounting structure in a magnetic disk device according to an eighth embodiment of the present invention.

FIG. 13 is a cross-sectional view showing vibration modes of the SPM and the disk in the magnetic disk device.

FIG. 14 is a plan view showing a magnetic disk device according to a ninth embodiment of the present invention.

FIG. 15 is a perspective view showing a configuration that is widely and generally used in a magnetic disk device.

FIG. 16 is a sectional view showing the structure of a squeeze air bearing plate in a conventional magnetic disk device.

[Explanation of symbols]

1 disc 5 Spindle motor 8 elastic members 9 shaft 10 Air bearing plate 10a Air bearing surface 11 screws

Claims (27)

[Claims] 1. A disk device comprising a rotary information recording disk provided with a dynamic pressure air bearing plate facing the surface of the disk. 2. The dynamic pressure air bearing plate is provided with an inflow portion of air into the dynamic pressure air bearing plate, and the flow passage is narrowed from the inflow portion along the rotation direction of the disk. 2. The disk device according to claim 1, wherein the disk device is configured so that a pressure rise occurs. 3. The dynamic pressure air bearing plate is provided with an inflow portion of air into the dynamic pressure air bearing plate, and the flow path is widened from the inflow portion along the rotation direction of the disk. 2. The disk drive according to claim 1, wherein the disk drive is configured to cause a pressure drop. 4. An air bearing plate facing a surface of a rotary information recording disk, and an air bearing surface of the air bearing plate and a surface of the information recording disk by moving the air bearing plate in an axial direction of the information recording disk. And a fixing means for fixing the air bearing plate in a state where the axial gap is adjusted. 5. A disk device comprising a housing, and the adjusting means has an air bearing plate of an information recording disk in a state where a fitting member provided on the housing and an air bearing plate are fitted to each other. An elastic member is provided so as to be movable in the axial direction, and an elastic member is provided between the housing and the air bearing plate so that the axial repulsive force acts on the housing and the air bearing plate. Any of a head seat surface that engages with one of the air bearing plate and the housing including the fitting member due to the repulsive force of the elastic member, and a housing that includes the air bearing plate and the fitting member 5. An adjusting screw having a screw part to be screwed to the other is provided, and the air bearing plate can be moved in the axial direction by the rotation of the adjusting screw. Disk device. 6. The disk device according to claim 4, wherein the fixing means is configured to fix the air bearing plate by a static frictional force based on the repulsive force of the elastic member. 7. The disk device according to claim 4, wherein the elastic member is any one of a compression coil spring, a wave washer, and a disc spring. 8. A rotary information recording disk, an air bearing plate facing the surface of the information recording disk, and a moving means for moving the air bearing plate in the axial direction of the information recording disk. While measuring the axial gap between the air bearing surface of the bearing plate and the surface of the information recording disk, the axial gap between the two is adjusted by the moving means, and when the predetermined gap is reached, the air bearing plate is moved in the axial direction. A method of assembling a disk device, characterized in that the disk device is fixed so as not to. 9. The air bearing surface is brought into contact with the surface of the information recording disk to make the axial gap between the two zero, and then the air bearing plate is moved away from the information recording disk by a predetermined distance in the axial direction. 9. The method of assembling a disk device according to claim 8, wherein a fixed amount of axial gap is provided. 10. The contact between the air bearing surface and the surface of the disk is detected by detecting the axial displacement of the information recording disk based on the contact between the air bearing surface and the surface of the information recording disk. 10. The method for assembling a disk device according to claim 9, wherein: 11. The moving means is constituted by a screw feeding mechanism, and the axial gap between the air bearing surface and the surface of the information recording disk is determined from the rotation angle of the screw in the screw feeding mechanism. 11. The method for assembling a disk device according to any one of 1 to 10. 12. While rotating the information recording disk,
By measuring the axial gap between the air bearing surface and the surface of the information recording disk, the rotational position at which the axial gap between the two is minimized is obtained, and the axial gap between the two is adjusted at this rotational position. The method for assembling a disk device according to any one of claims 8 to 11, which is characterized in that. 13. An air bearing surface of an information recording disk and an air bearing surface of the information recording disk, wherein at least a part of the air bearing surface of the air bearing plate facing the surface of the information recording disk protrudes more than other parts of the air bearing surface. 8. The disk device according to claim 1, further comprising a protective film that makes an axial gap with the surface narrower than an axial gap in the other portion. 14. The disk device according to claim 13, wherein the protective film is provided opposite to the outside of the data area on the surface of the information recording disk. 15. An air bearing plate facing the surface of the information recording disk, and an air bearing plate mounting portion for mounting the air bearing plate, wherein the air bearing plate is mounted on the air bearing plate mounting portion. A plurality of types having different sizes from the mounting surface to the air bearing surface facing the surface of the information recording disk are prepared, and the dimensions are the same as the information from the mounting surface of the air bearing plate in the air bearing plate mounting portion. It is characterized in that one having a dimension such that an axial gap between the air bearing surface and the surface of the information recording disk becomes a predetermined value in correspondence with the distance to the surface of the recording disk is selectively mounted. Disk device. 16. An air bearing plate facing the surface of an information recording disk, from a mounting surface to an air bearing plate mounting portion for mounting the air bearing plate to an air bearing surface facing the surface of the information recording disk. Prepare a plurality of different dimensions of the, from the mounting surface of the air bearing plate in the air bearing plate mounting portion to the surface of the information recording disk, measure the distance along the axial direction of the information recording disk, As the air bearing plate, one whose size is such that the axial gap between the air bearing surface and the surface of the information recording disk has a predetermined value in correspondence with the result of measuring the distance is selectively used. A method of assembling a disk device, which is characterized by being used. 17. An axial distance between the surface of the information recording disk and the air bearing plate mounting portion is determined by a mounted portion mounted on the air bearing plate mounting portion and a displacement sensor facing the surface of the information recording disk. 17. The method for assembling a disk device according to claim 16, wherein the displacement meter is provided. 18. The distance between the mounting surface of the air bearing plate in the air bearing plate mounting portion and the surface of the information recording disk along the axial direction of the information recording disk, and the mounting surface and the information recording disk. 18. The method of assembling a disk device according to claim 16, wherein the inclination with respect to the surface is also measured. 19. The mounting surface of the air bearing plate in the air bearing plate mounting portion when measuring the inclination between the mounting surface of the air bearing plate in the air bearing plate mounting portion and the surface of the information recording disk. 19. The method for assembling a disk device according to claim 18, wherein the respective inclinations of and are detected by a laser angle measuring device, and then the relative inclination between them is calculated. 20. An air bearing plate facing the surface of an information recording disk, and an air bearing plate mounting portion for mounting the air bearing plate, wherein the air bearing plate mounting portion is in the axial direction of the information recording disk. The air bearing plate is detachably attached to the mounting portion, and the air bearing plate mounting portion is in a state in which the air bearing plate is removed from the mounting portion. Then, the distance from this mounting portion to the surface of the information recording disk is measured, and based on the result of measuring this distance, the axial gap from the air bearing surface of the air bearing plate to the surface of the information recording disk is a predetermined value. A disk device, which is configured to be positioned at such a position. 21. A positioning means is provided for positioning the air bearing plate mounting portion at an arbitrary position along the axial direction of the information recording disk, and the positioning means is provided in a housing constituting the disk device. The air bearing plate mounting portion is configured to be movable in the axial direction of the information recording disk in a state where the fitting member and the air bearing plate mounting portion are fitted to each other. An elastic member is provided between the housing and the air bearing plate mounting portion so that the repulsive force in the axial direction acts, and the air bearing plate mounting portion and the fitting member are connected by the repulsive force of the elastic member. An adjustment having a head seat surface that engages with either one of the housings including the housing, and a screw portion that is screwed to the other of the housing including the air bearing plate mounting portion and the fitting member. A screw is provided for this adjustment 21. The disk device according to claim 20, wherein the air bearing plate mounting portion is moved in the axial direction by the rotation of the node screw so as to be positioned. 22. The disk device according to claim 21, wherein the air bearing plate mounting portion is positioned and fixed by a static frictional force based on the repulsive force of the elastic member. 23. An air bearing plate mounting portion for mounting an air bearing plate facing the surface of a rotary information recording disk can be positioned at any position along the axial direction of the information recording disk. The air bearing plate is detachably attached to the mounting portion, and the air bearing plate is mounted while measuring the distance from the mounting portion to the surface of the information recording disk with the air bearing plate removed from the mounting portion. The position of the air bearing plate is changed when the position of the portion is changed to such a position that the axial gap from the air bearing surface of the air bearing plate to the surface of the information recording disk has a predetermined value. A method for assembling a disk device, wherein the parts are positioned. 24. An air bearing plate mounting portion for mounting an air bearing plate facing the surface of a rotary information recording disk can be positioned at any position along the axial direction of the information recording disk. , The air bearing plate is detachable from the mounting portion, and with the air bearing plate removed from the mounting portion, the distance from the mounting portion to the surface of the information recording disk is measured, and then the distance is measured. Based on the above result, the air bearing plate mounting portion is positioned at a position where the axial gap from the air bearing surface of the air bearing plate to the surface of the information recording disc becomes a predetermined value. How to assemble the device. 25. While rotating the information recording disk,
By measuring the deflection of the surface of the information recording disc, when the air bearing plate is mounted on the mounting portion, the rotational position where the axial gap from the air bearing surface of the air bearing plate to the surface of the information recording disc is minimized is determined. In search of this rotational position,
25. The method of assembling a disk device according to claim 23, wherein the air bearing plate mounting portion is axially positioned. 26. The disk device according to claim 1, wherein a plurality of air bearing plates are provided at equal angular intervals along the rotation direction of the information recording disk. 27. The air bearing plate as claimed in claim 4, wherein the air bearing plate is a squeeze air bearing plate or a dynamic pressure air bearing plate. Disk device.