JP2002373485A - Disk drive and method and device for manufacturing therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately improve the parallelism of a disk-loading face 6b. SOLUTION: Through laser forming work performed by irradiating a proper position on the fixed frame 1 side with a laser beam 25d, the hub 6 is displaced, at least in the axial direction to the extent that the parallelism of the disk- loading face 6b is brought into a prescribed range. Thus, improvement of the parallelism of the disk loading face 6b, which is difficult with mechanism forming work, is accomplished by employing the laser forming work method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device in which a hub for holding a recording medium disk on a disk mounting surface is rotatably supported by a fixed frame via a dynamic pressure bearing, and a disk drive device. The present invention relates to a manufacturing method and a manufacturing apparatus.

[0002]

2. Description of the Related Art In recent years, it has become necessary to rotate various recording medium disks, such as magnetic disks and optical disks, with high density and high precision. Various proposals have been made. For example, in a spindle motor for a hard disk drive (HDD) shown in FIG. 11, a fixed shaft 2 erected at a substantially central portion of a fixed frame 1
A bearing sleeve (bearing member) 3 is rotatably inserted, and a lubricating fluid such as oil or magnetic fluid is provided in a small radial gap between the outer peripheral surface of the fixed shaft 2 and the inner peripheral surface of the bearing sleeve 3. , Two radial bearing portions RB, RB are formed apart from each other in the axial direction.

[0003] Also, at the upper end of the fixed shaft 2 in the figure,
A ring-shaped thrust plate 4 is joined by press-fitting, shrink-fitting, screwing, and the like, and both end surfaces in the axial direction of the thrust plate 4 and the bearing sleeve 3,
And a counter plate 5 attached to the bearing sleeve 3 are arranged to face each other with a small gap in the axial direction. A lubricating fluid is injected into each of the minute gaps so as to be continuous from the above-described radial bearing portion RB.
Thrust dynamic pressure bearings SB at the upper and lower two locations on both axial sides of
a and SBb are formed.

At this time, the above-described bearing sleeve 3 is formed so as to form a one-bag space in which the upper end in the drawing is open and the lower end in the drawing is closed, and is provided in the radial bearing portions RB, RB. At least one of the formed radial dynamic pressure generating grooves is an asymmetric groove so as to generate a pumping force toward the upper side in the drawing, which is the inner side of the one-blank space of the bearing sleeve 3. It is formed so as to have a shape.

On the other hand, on the outer peripheral surface of the bearing sleeve 3,
A rotating hub 6 for holding a recording medium disk (not shown) is joined by press-fitting, shrinkage fitting or the like. Disk insertion surface 6a formed on the outer peripheral surface of this rotary hub 6
The recording medium disk (not shown) is inserted and positioned in the radial direction, and is provided so as to protrude outward in the radial direction from the lower end edge of the disk insertion surface 6a in the flange shape. By mounting the inner peripheral portion of the recording medium disk on the disk mounting surface 6b, the recording medium disk is set in a state of being positioned in the axial direction. The recording medium disk set on the disk mounting surface 6b of the rotary hub 6 in this manner is held by the pressing force of a clamper (not shown) screwed to the upper end of the rotary hub 6 in the figure.

[0006]

However, various types of disk drive devices provided with such a dynamic pressure bearing are mounted on notebook personal computers and mobile information terminals, in particular, due to the recent demand for lighter, thinner and smaller devices. In this case, the thickness is rapidly reduced, so that when joining the shaft member or the bearing member and the fixed frame, the joint length in the axial direction cannot be sufficiently secured. As a result, when the hub is rotationally driven, vibration in the axial direction is apt to occur, and the parallelism of the disk mounting surface with respect to the fixed frame does not tend to fall within the required specified range. And when the parallelism of the disk mounting surface decreases,
This will reduce the yield of the disk drive and the like, which may be a factor that hinders the productivity or reliability of the disk drive.

The cause of such a decrease in the parallelism of the disk mounting surface is that the shaft member or the bearing member is joined to a fixed frame in a state where the shaft member and the bearing member are mounted so as to be relatively rotatable. In the case of the above. That is, since the shaft member and the bearing member are mounted with a backlash from each other by an amount corresponding to the bearing gap,
When the shaft member or the bearing member is joined, the positional relationship between the fixed frame and the fixed frame is inclined by the amount of the backlash in the bearing set, and the above-described disk mounting surface and the reference surface of the fixed frame are positioned by the jig. Even if it does, the parallelism will be reduced because it will be inclined and joined by the amount of the play.

For example, consider the factors that cause the mounting height of the recording medium disk 12 mounted on the disk drive motor 11 having the dynamic pressure bearing device as shown in FIG. The disk drive motor 11 shown in FIG. 12 has a structure in which an attachment reference surface 13a of the fixed frame 13 is fixed to a drive chassis (not shown).

First, as a factor of a change in the mounting height of the recording medium disk 12 at the time of rated rotation of the disk drive motor 11, the axial direction of the thrust bearing portion 14 as shown in FIG. There is a flying height h. At the time of floating, the load applied to the thrust bearing portion 14 fluctuates depending on the attitude of the motor, and the mounting height of the recording medium disk 12 is liable to fluctuate due to variations in the processing accuracy and assembly accuracy of the components constituting each bearing portion. . Further, as shown in FIG. 12B, even when the rotating hub 15 holding the recording medium disk 12 does not have a correct perpendicularity to the shaft member 16, the recording medium is The disk 12 is in a shake state, and the mounting height is changed. Further, as shown in FIG. 11 (c), even when the entire bearing device does not have an accurate right angle with respect to the fixed frame 13, the variation in the mounting height of the recording medium disk 12 and the Become. Further, other fluctuation factors related to the mounting height of the recording medium disk 2 include a rotary flutter and a rotational runout of the dynamic pressure bearing device.
m or less and has no direct effect.

Further, when the disk drive motor 11 is in the rotation stopped state, as shown in FIG.
It is almost impossible to be completely parallel to a. As shown in FIGS. 13B and 13C, this is caused by the magnetic attraction by the drive magnetic circuit including the magnet and the core winding, the motor posture, the imbalance of the rotating body, and the like. This is because 16 stops at an angle corresponding to the bearing clearance.

In view of the above situation, the present invention provides a disk drive capable of easily and accurately modifying the parallelism of a disk mounting surface, and a method and apparatus for manufacturing a disk drive. The purpose is to provide.

[0012]

According to a first aspect of the present invention, there is provided a disk drive device, wherein a laser forming process for irradiating a laser beam is performed on an appropriate position on a fixed frame side. Thus, the fixed frame is displaced at least in the axial direction so that the parallelism of the disk mounting surface with respect to the reference surface of the fixed frame falls within a specified range.

That is, even if mechanical forming is employed in repairing the parallelism of the disk mounting surface of the hub, it is extremely difficult to perform a highly accurate repair due to the occurrence of springback and the like. According to the disk drive device of the first aspect, by employing the laser forming process, the parallelism of the disk mounting surface can be easily and accurately repaired.

[0014] Such an operation is achieved in claims 2 and 3.
The same can be obtained in both the fixed shaft type and the shaft rotating type such as the disk drive device according to the above.

According to a fourth aspect of the invention, in addition to the first aspect, at least a laser forming portion of the fixed frame includes an auxiliary frame member or an intermediate member made of an iron-based material suitable for laser forming. Is provided, so that the material of the fixed frame itself can be freely selected.

According to a fifth aspect of the present invention, in addition to the first aspect, the fixed frame further comprises:
It is displaced toward the side on which the laser forming process is performed, and by changing the side on which the laser forming process is performed, it is possible to cause the displacement of the fixed frame toward any side in the axial direction. ing.

[0017] On the other hand, in the method of manufacturing a disk drive device according to claim 6, a bearing set is formed by assembling the shaft member in advance on the dynamic pressure bearing side, and the shaft set in the bearing set is formed. After joining the member or the bearing member to the fixed frame or the hub, while rotating the hub, the parallelism of the disk mounting surface with respect to the reference surface of the fixed frame is measured, and the measurement result of the parallelism is within a specified range. With respect to the outside, laser forming is performed by irradiating a laser beam to an appropriate position on the fixed frame side, and the fixed frame is moved at least in the axial direction so that the parallelism of the disk mounting surface falls within a specified range. To be displaced. In other words, even if mechanical forming processing is used to repair the parallelism of the disk mounting surface of the hub, it is extremely difficult to perform high-precision repair due to the occurrence of springback, etc. According to the manufacturing method of the disk drive device according to the seventh aspect, by employing the laser forming process, the parallelism of the disk mounting surface can be easily and accurately repaired.

According to a seventh aspect of the present invention, in addition to the sixth aspect, an auxiliary frame member made of an iron-based material suitable for laser forming is provided on at least a laser forming portion of the fixed frame. Since the intermediate member is provided, the material of the fixed frame itself can be freely selected.

Further, in the method of manufacturing a disk drive device according to the eighth aspect, in addition to the sixth aspect, the fixed frame is displaced toward the laser-formed side. By changing the side on which the laser forming process is performed, it is possible to cause the displacement of the fixed frame toward any side in the axial direction.

Further, in the disk drive manufacturing apparatus according to the ninth aspect, a drive circuit for driving the disk drive to rotate the hub at a constant speed, and irradiating a laser beam to an appropriate position on the fixed frame side. A laser oscillation device that performs laser forming processing, a rotation detector that detects a rotation position of the hub, and measures and outputs an axial displacement amount of the disk mounting surface of the hub with respect to a reference surface of the fixed frame. The parallelism detector and the measurement signal output from the parallelism detector are compared with the actual displacement value of the laser forming process stored in advance, and the irradiation position and irradiation amount of the laser light irradiated from the laser oscillation device are determined. And a laser irradiation control device for appropriately operating the laser oscillator based on the calculation result. To have.

That is, even if mechanical forming is used to repair the parallelism of the disk mounting surface of the hub, it is extremely difficult to perform the repair with high accuracy due to the occurrence of springback. According to the manufacturing apparatus for a disk drive device according to the ninth aspect, the parallelism of the disk mounting surface can be easily and accurately repaired by employing the laser forming process.

Further, in the disk drive manufacturing apparatus according to the tenth aspect, in addition to the ninth aspect, the laser oscillator of the automatic parallelism repair device is a YAG laser oscillator. Thus, the above-described laser forming process is reliably performed.

Further, in the disk drive manufacturing apparatus according to the eleventh aspect, in addition to the ninth aspect, the laser irradiation control device of the automatic parallelism repairing device includes an output from the laser oscillator based on the calculation result. An emission delay circuit that adjusts the timing, an emission power adjustment circuit that adjusts the output power from the laser oscillator based on the calculation result, and an emission time adjustment circuit that adjusts the output time from the laser oscillator based on the calculation result Therefore, the laser forming process is reliably performed while simplifying the apparatus.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a motor of a hard disk drive (HDD) will be described below.

First, the overall schematic structure of a spindle motor for a hard disk drive (HDD) in the embodiment shown in FIG. 4 is the same as that of FIG. 2 described above, and therefore the description of the overall structure of the motor is omitted. However, such a spindle motor for a hard disk drive (HDD) is mounted in a thin plate-shaped drive case DC as shown in FIGS. 1 and 2, for example.

That is, a recording medium disk D as shown in FIGS. 1 and 2 is mounted on a spindle motor for a hard disk drive (HDD) mounted in the drive case DC. Are fixed by screws. On the recording medium disk D, a recording / reproducing head H of a ramp load (load and load) system for recording / reproducing on / from the recording medium disk D is connected via a head arm H2 extending from a carriage H1. It is attached. The recording / reproducing head H is reciprocated in the radial direction so as to sandwich both sides of the recording medium disk D.

On the other hand, as shown in FIGS. 3 and 4, when the fixed shaft (shaft member) 2 is joined to the fixed frame 1 of the spindle motor for the hard disk drive (HDD), First, a bearing set DB in which the fixed shaft 2 is assembled in a bearing sleeve (bearing member) 3
Assembled in advance. As described above, the bearing set DB has the bearing sleeve 3 rotatably mounted on the fixed shaft 2, and the outer peripheral surface of the fixed shaft 2 and the inner peripheral surface of the bearing sleeve 3. Two radial bearing portions RB, RB are formed apart from each other in the axial direction by injecting a lubricating fluid such as oil or magnetic fluid into the minute gaps in the radial direction between them. The fixed shaft 2
A ring-shaped thrust plate 4 is joined to the upper end portion of the drawing by press-fitting, shrink fitting, screwing, or the like, and both end surfaces of the thrust plate 4 in the axial direction, the bearing sleeve 3, and the bearing sleeve 3 And a counter plate 5 attached to the base plate are opposed to each other with a minute gap in the axial direction. A lubricating fluid is injected into each of the minute gaps so as to be continuous from the above-described radial bearing portion RB, and two axial thrust dynamic pressure bearing portions SBa are provided on both axial sides of the thrust plate 4. , SBb are formed.

At this time, the bearing sleeve 3 assembled to the above-described bearing set DB is formed so as to form a single-bag space in which the lower end in the drawing is open and the upper end in the drawing is closed. Radial bearings RB, R
At least one of the radial dynamic pressure generating grooves formed in each of the bearing sleeves B exerts a pumping force toward the upper side in the drawing, which is the inner side of the one-blank space of the bearing sleeve 3 during the rotation driving. It is formed so as to form an asymmetric groove shape so as to generate the groove.

The illustrated lower end portion of the fixed shaft 2 assembled to such a bearing set DB protrudes from the lower end opening of the bearing sleeve 3.
The fixing frame 1 is joined by being inserted into a mounting hole 1a formed through the fixing frame 1 by press-fitting, shrink-fitting or the like.

Before the fixed shaft 2 formed on the bearing set DB as described above is joined to the fixed frame 1, a drive system such as a stator set 7 and a drive magnet 8 is mounted.
Thus, a spindle motor for a hard disk drive (HDD) is once completed. Then, using the automatic parallelism repair device described below, the rotating hub 6 is used.
The parallelism of the disk mounting surface 6b is measured, and
In accordance with the measurement result of the parallelism, laser forming is performed on the fixed frame 1 so that the parallelism is automatically modified.

That is, in the above-mentioned automatic parallelism repairing apparatus, as shown in FIG. 5, the spindle motor M for a hard disk drive (HDD) having the above-described configuration is used.
Are fixed upside down by the holding jig 21 with the fixed frame 1 side up. A motor drive circuit 22 for supplying a predetermined drive current to the drive system of the spindle motor M for the hard disk drive (HDD) is provided, and the motor drive circuit 22 drives the rotary hub 6 at a constant speed. It is designed to be driven to rotate.

The hard disk drive (HD)
An autocollimator 23 as a parallelism detector is provided at a position directly below the rotary hub 6 of the spindle motor M for D) in the axial direction.
Is disposed, and the detection light emitted from the autocollimator 23 is transmitted to the disk mounting surface 6 of the rotary hub 6.
b, and the reflected light is received again by the autocollimator 23, whereby the axial displacement of the disk mounting surface 6b, that is, the parallelism is measured. The measurement result of the parallelism by the autocollimator 23 as the parallelism detector is as follows.
The signal is output to the laser irradiation control device 24 described later through the operational amplifier 23a.

Further, the disc insertion surface provided on the outer peripheral surface side of the rotary hub 6 is provided with a marking or a concave portion (not shown) as a position detecting portion serving as a circumferential origin position. The marking or the concave portion is detected by a rotation detector (not shown) arranged to face the disk insertion surface 6a of the rotary hub 6 in the radial direction. Then, a timing signal at the time when the marking or the concave portion is detected by the rotation detector is output to a laser irradiation control device 24 described later.

Further, above the fixed frame 1 of the spindle motor M for the hard disk drive (HDD), a laser irradiation port 25a of a YAG laser oscillator 25 is provided at an appropriate distance from the fixed frame 1 in the axial direction. It is arranged to open. This YAG laser oscillation device 25 is
Is configured to emit a processing laser beam 25d from the laser irradiation port 25a provided at the distal end portion of the optical fiber 25c extending from the main body 25b of the fixed frame 1 in the radial direction. The laser beam 25 for processing is positioned at a predetermined appropriate position.
This is a device that performs a so-called laser forming process by irradiating d. The laser forming process is described in, for example, Journal of Precision Engineering Society V
ol. 67, no. 2, 2001, page 300 et seq.

The laser irradiation port 25a of the YAG laser oscillator 25 is connected to the hard disk drive (HD).
At a position immediately above the fixed frame 1 of the D) spindle motor M, the XY stage 26 is configured to be moved to an arbitrary position in a horizontal plane. The XY stage 26 is moved to an appropriate horizontal position and stopped by receiving a position control signal from a laser irradiation control device 24 described later via a stage controller 26a.

On the other hand, the laser irradiation control device 24 includes:
Autocollimator 23 as parallelism detector described above
Is provided with an arithmetic unit 24a for comparing the measurement signal output from the controller with the displacement actual value stored in advance. This arithmetic unit 2
The actual displacement value stored in the fixed frame 1a is obtained by variously changing the output power and output time of the processing laser beam 25d with respect to each position on a predetermined circumference in the radial direction. Is measured in the axial direction. Then, the actual measured signal obtained from the above-described autocollimator 23 is compared with the actual displacement value at each position in the circumferential direction, and the axis required for the fixed frame 1 is determined based on the comparison result. Direction displacement amount, ie, processing laser beam 25d to be irradiated
The position in the circumferential direction (the rotation angle from the detected origin position), the output power, and the output time are calculated by the computing unit 24.
a is calculated.

When the irradiation position of the processing laser beam 25d on the fixed frame 1 is changed in the radial direction, the actual displacement value for the corresponding radial position is measured in advance.

Thus, the laser irradiation control device 2
The output power and output time of the processing laser beam 25d to be irradiated, calculated by the arithmetic unit 24a of No. 4
A light emission power adjustment circuit 24b for adjusting output power and output time from the AG laser oscillation device 25, respectively.
And input to the light emission time adjustment circuit 24c. From the light emission power adjustment circuit 24b and the light emission time adjustment circuit 24c,
A necessary drive control signal is issued to the YAG laser oscillation device 25.

That is, as shown in FIG.
From the YAG laser oscillation device 25, a laser beam 25d for processing of a required output power is provided at a required timing.
Is emitted to the fixed frame 1 for a required time, and the fixed frame 1 irradiated with the processing laser light 25d is irradiated with the processing laser light 25d (illustrated in FIG. The above-mentioned parallelism is modified so that the disk mount surface 6b of the rotary hub 6 is deformed to warp (upward) and axially displaced, so that the parallelism of the disk mounting surface 6b is within a predetermined range. Is being done.

At this time, the above-mentioned irradiation with the laser beam 25d may be performed while maintaining the rotation state of the rotary hub 6 as it is when measuring the runout accuracy while rotating the rotary hub 6, or After the measurement of the runout accuracy of the rotary hub 6 is completed, the rotation of the rotary hub 6 may be stopped before the measurement. Further, in this embodiment, the laser irradiation port 25a side of the optical fiber 25c is moved within an appropriate angular range in the circumferential direction. However, the laser beam 25d is appropriately shifted in the circumferential direction using a galvanometer mirror or the like. Irradiation may be performed while moving within the angle range.

In repairing the parallelism of the disk mounting surface 6b, it is extremely difficult to repair with high precision due to the occurrence of springback even if mechanical forming is employed. According to the embodiment, by adopting the laser forming process, the parallelism of the disk mounting surface 6b can be easily and accurately repaired.

As the laser oscillation device used for the laser forming process in the above embodiment, Y
Since the AG laser oscillation device 25 is used,
Inexpensive and small-sized devices are used to reliably perform laser forming.

Further, in the laser irradiation control device 24 of this embodiment, based on the output power and output time of the processing laser light 25d to be irradiated calculated by the calculator 24a, the light emission power adjustment circuit 24b and the light emission time From the adjustment circuit 24c, the YAG laser oscillation device 25
Since a necessary drive control signal is issued to the laser beam, laser forming processing is surely performed while simplifying the apparatus.

On the other hand, in the automatic parallelism repair apparatus shown in FIG. 7, a spindle motor M for a hard disk drive (HDD) is held on a rotary table 31 as a different configuration from the apparatus shown in FIG. The rotary table 31 is configured to be positioned at an arbitrary rotational position by the rotation operation. A YAG laser oscillating device 25 is located immediately above the fixed frame 1 of the spindle motor M for a hard disk drive (HDD).
Of the laser irradiation port 25a is fixedly arranged at a fixed position. Also, three non-contact displacement meters 33 arranged in a horizontal plane are used as parallelism detectors. Even when such an automatic parallelism repair device is used, repair of the parallelism of the disk mounting surface 6b is easily and accurately performed in the same manner as the above-described device.

On the other hand, the present invention can be similarly applied to a spindle motor M for a hard disk drive (HDD) provided with a shaft rotating type dynamic pressure bearing device as shown in FIG. In the shaft rotation type motor shown in FIG. 8, the rotating hub 46 is joined to the rotating shaft (shaft member) 42. In joining the rotating hub 46, the rotating shaft 42 is first fixed to a fixed bearing sleeve (bearing). The bearing assembly DB is assembled in advance in the member 43. The bearing set DB is housed in a fixed bearing sleeve 43 by the rotation shaft 42.
Are rotatably inserted, and lubricating fluid such as oil or magnetic fluid is injected into a minute radial gap between the inner peripheral surface of the bearing sleeve 43 and the outer peripheral surface of the rotating shaft 42. As a result, two radial bearing portions RB, RB are formed apart from each other in the axial direction. Also,
A ring-shaped thrust plate 44 is joined to the lower end of the rotary shaft 42 in the figure by press-fitting, shrink-fitting, screwing, and the like. A counter plate 45 attached to the bearing sleeve 43 is opposed to the counter plate 45 with a minute gap in the axial direction. A lubricating fluid is injected into each of the minute gaps so as to be continuous from the above-described radial bearing portion RB.
Thrust dynamic pressure bearing portions SBa and SBb are formed at the locations.

At this time, the bearing sleeve 43 assembled in the above-described bearing set DB is open at the upper end in the drawing.
In addition, the lower end side in the figure is formed so as to constitute a single-bag space in which the lower end side is closed, and the above-described radial bearing portion RB,
At least one of the radial dynamic pressure generating grooves formed in each of the RBs exerts a pumping force toward the upper side in the drawing, which is the inner side of the one-blank space of the bearing sleeve 43, during rotation driving. It is formed so as to form an asymmetric groove shape so as to generate the groove.

The illustrated upper end of the rotating shaft 42 assembled to the bearing set DB projects from the lower end opening of the bearing sleeve 43, but the lower projecting portion of the rotating shaft 42 is not shown. The rotating hub 46 for holding the recording medium disk is joined. That is, a mounting hole 46a is formed in the rotation center position of the rotary hub 46 so as to penetrate in the axial direction.
Are inserted into and joined to the rotation shaft 42 by press-fitting and shrink fitting.

The recording medium disk is inserted into the rotary hub 46 mounted on the disk drive device and positioned in the radial direction with respect to the disk insertion surface 46a provided on the outer peripheral surface side. The inner peripheral portion of the recording medium disk is mounted on a disk mounting surface 46b provided to protrude radially outward from the insertion surface 46a in a flange shape, and the recording medium disk is axially moved. It is set so that it is positioned. Further, the recording medium disk set on the disk mounting surface 46b of the rotary hub 46 in this manner is held by the pressing force of a clamper (not shown).

As described above, before or before the rotary hub 46 is joined to the rotary shaft 42 formed in the bearing set DB, a drive system such as the stator set 47 and the drive magnet 48 is mounted, and thereby, once, Complete the disk drive. Then, in the same manner as in the above-described embodiment, the disk mounting surface 46 of the rotating hub 46 is used by using an automatic parallelism repairing device as shown in FIG. 5 or FIG.
The degree of parallelism of b is measured, and in accordance with the measurement result of the degree of parallelism, laser forming processing is performed on the fixed frame 41 to automatically improve the runout accuracy.

The embodiments shown in FIGS. 9 and 10 also apply the present invention to a disk drive device provided with a shaft-rotating type dynamic pressure bearing device. In the embodiment, the material of the fixed frame 41 is formed of a material that is not suitable for laser processing such as a resin material or aluminum. In the embodiment of FIG.
The fixed frame 4 is provided on the bearing sleeve 43 side via an auxiliary frame member 51 made of a material suitable for laser forming, for example, an iron-based material such as stainless steel.
1 are joined. The auxiliary frame member 51 in the present embodiment is formed of a cylindrical member having a substantially L-shaped cross section.

Further, in the embodiment shown in FIG. 10, the intermediate member 61 embedded in a part of the fixed frame 41 is used.
Are made of a material suitable for laser forming, such as an iron-based material such as stainless steel. According to such an embodiment shown in FIG. 9 or FIG.
For the auxiliary frame member 51 or the intermediate member 61,
Laser forming processing is applied, and the disk mounting surface 4
6b is improved by the auxiliary frame member 51.
Alternatively, it is performed in the intermediate member 61,
The material of the fixed frame 41 itself can be freely selected.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above embodiment and can be variously modified without departing from the gist of the invention. Needless to say, there is.

For example, in the above-described embodiment, a YAG laser oscillation device is used as a laser oscillation device, but other laser oscillation devices can be similarly employed. Further, the present invention can be applied not only to the hard disk drive (HDD) as in the above-described embodiments, but also to disk drives in various other various devices.

[0054]

As described above, according to the first aspect of the present invention,
The disk drive device according to the above, performing a laser forming process of irradiating a laser beam to an appropriate position on the fixed frame side, the fixed frame at least in the axial direction so that the parallelism of the disk mounting surface is within a specified range It is displaced, and it is difficult to apply mechanical forming to the disk mounting surface.By using laser forming, the disk mounting surface can be easily and accurately repaired. Therefore, the productivity and reliability of the disk drive device can be improved.

A disk drive device according to claim 2 or 3 is a device using a fixed-shaft or shaft-rotation type dynamic pressure bearing in addition to the above-described claim 1, and the disk drive device according to claim 2 The above-described effects can be similarly obtained in both the fixed type and the shaft rotation type.

According to a fourth aspect of the present invention, in addition to the first aspect, an auxiliary frame member or an intermediate member made of an iron-based material suitable for laser forming is provided on at least a laser forming portion of the fixed frame. By arranging them, the material of the fixed frame itself can be freely selected, so that the above-mentioned effects can be further enhanced.

According to a fifth aspect of the present invention, in addition to the first aspect, the fixed frame is displaced toward the side on which the laser forming process is performed.
By changing the side on which the laser forming process is performed, it is possible to cause displacement of the fixed frame in any direction in the axial direction, so that the productivity and reliability of the disk drive device are ensured. Can be improved.

On the other hand, according to the disk drive method of the present invention, after the hub is joined to the rotating shaft provided in the bearing assembly, the parallelism of the disk mounting surface is measured while rotating the hub, and the parallelism is measured. If the measurement result is out of the specified range, apply laser forming processing to irradiate laser light to an appropriate position on the fixed frame side, and fix the fixed position so that the parallelism of the disk mounting surface falls within the specified range. The parallelism of the disk mounting surface is improved by laser forming, which makes it difficult to use mechanical forming to displace the frame at least in the axial direction. Therefore, the productivity and reliability of the disk drive device can be improved.

According to a seventh aspect of the present invention, in the method for manufacturing a disk drive device according to the sixth aspect, an auxiliary frame member made of an iron-based material suitable for laser forming is provided on at least a laser forming portion of the fixed frame. Since the intermediate member is provided so that the material of the fixed frame itself can be freely selected, the above-described effects can be further enhanced.

On the other hand, a method of manufacturing a disk drive device according to claim 8 is the method according to claim 6, wherein the hub is displaced toward the laser-formed side.
By changing the side on which the laser forming process is performed, it is possible to cause the displacement of the hub toward any side in the axial direction, thereby ensuring the productivity and reliability of the disk drive. Can be improved.

Further, according to a ninth aspect of the present invention, there is provided a disk drive manufacturing apparatus which drives a disk drive to rotate a hub at a constant speed, and irradiates a laser beam to an appropriate position on a fixed frame side. A laser oscillation device for performing a laser forming process, a rotation detector for detecting a rotational position of the hub, a parallelism detector for measuring and outputting an axial displacement amount on a disk mounting surface of the hub, and The measurement signal output from the degree detector is compared with the displacement value of the laser forming process stored in advance,
A laser irradiation control device that calculates the irradiation position and irradiation amount of the laser light irradiated from the laser oscillation device, and appropriately operates the laser oscillator based on the calculation result,
The parallel mounting of the disk mounting surface, which is difficult even with the use of mechanical forming, is improved by laser forming. Since the operation is performed easily, accurately, and automatically, the productivity and reliability of the disk drive device can be improved.

Further, in the disk drive manufacturing apparatus according to the tenth aspect, in addition to the ninth aspect, the laser oscillator of the automatic parallelism repairing device is a YAG laser oscillator, so that it is an inexpensive and compact device. Laser forming processing is performed reliably, and the above-described effects can be further enhanced.

According to a twelfth aspect of the present invention, in the disk drive manufacturing apparatus according to the ninth aspect, the laser irradiation control device of the automatic parallelism repairing device further comprises: Based on the circumferential position, output power, and output time, the emission delay circuit, the emission power adjustment circuit, and the emission time adjustment circuit issue necessary drive control signals to the laser oscillation device to simplify the device. Since the laser forming process is performed with reliability, the above-described effects can be further improved.

[0064]

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing a structure of a hard disk drive (HDD) as an example of a disk drive according to the present invention.

FIG. 2 shows a hard disk drive (HD) shown in FIG.
It is a horizontal longitudinal cross-sectional explanatory view showing the structure of D).

FIG. 3 is an explanatory longitudinal sectional view showing a joining and assembling process of the disk drive device according to the embodiment of the present invention.

FIG. 4 is an explanatory longitudinal sectional view showing a state after joining and assembling of the disk drive device in the embodiment shown in FIG. 3;

FIG. 5 is a block diagram illustrating a schematic configuration of an automatic parallelism repair device according to an embodiment of the present invention.

FIG. 6 is an explanatory longitudinal sectional view showing a run-out repairing step in one embodiment of the present invention.

FIG. 7 is a block diagram illustrating a schematic configuration of an automatic parallelism repair device according to another embodiment of the present invention.

FIG. 8 is an explanatory longitudinal sectional view showing a run-out repair process according to another embodiment of the present invention.

FIG. 9 is an explanatory longitudinal sectional view showing a run-out repair process according to still another embodiment of the present invention.

FIG. 10 is an explanatory longitudinal sectional view showing a run-out repair process according to still another embodiment of the present invention.

FIG. 11 is an explanatory longitudinal sectional view showing a structural example of a spindle motor for a hard disk drive (HDD) as an example of a disk drive.

FIG. 12 is a schematic diagram showing a variation factor of a mounting height when a recording medium disk mounted on a disk drive device having a dynamic pressure bearing device is rotationally driven.

FIG. 13 is a schematic diagram illustrating a variation factor of a mounting height when rotation of a recording medium disk mounted on a disk drive device having a dynamic pressure bearing device is stopped.

[Explanation of symbols]

 DC drive case D Recording medium disk H Recording / reproducing head 1 Fixed frame 1a Mounting hole 2 Fixed shaft (shaft member) 3 Bearing sleeve (bearing member) 6 Rotating hub RB Radial bearing part SBa, SBb Thrust dynamic pressure bearing part 22 Motor drive circuit Reference Signs List 23 Autocollimator 24 Laser irradiation control device 25 YAG laser oscillation device 25d Processing laser beam 26 XY stage 31 Rotary table 33 Non-contact displacement meter 41 Fixed frame 42 Rotating shaft (shaft member) 43 Bearing sleeve (Bearing member) 46 Rotating hub 46b Disk mounting surface DB Bearing set 51 Auxiliary frame member 61 Intermediate member

Claims (11)

[Claims] 1. A disk in which a hub holding a recording medium disk on a disk mounting surface is rotatably supported on a fixed frame side via a dynamic pressure bearing in which a shaft member and a bearing member are rotatably mounted. In the driving device, a laser forming process for irradiating a laser beam is performed at an appropriate position on the fixed frame side, so that the parallelism of the disk mounting surface with respect to a reference surface of the fixed frame falls within a specified range. The disk drive device, wherein the fixed frame is displaced at least in the axial direction to the extent possible. 2. The method according to claim 1, wherein the shaft member comprises a fixed shaft joined to a fixed frame, and the hub is joined to a dynamic pressure bearing rotatably supported on the fixed shaft. The disk drive according to claim 1. 3. The shaft member comprises a rotating shaft rotatably supported by a bearing member attached to a fixed frame, and the hub is joined to the rotating shaft. 2. The disk drive according to 1. 4. The moving frame according to claim 1, wherein an auxiliary frame member or an intermediate member made of an iron-based material suitable for laser forming is disposed at least in a laser forming portion of the fixed frame. Disk drive with pressure bearing. 5. The disk drive device having a dynamic pressure bearing according to claim 1, wherein the fixed frame is displaced toward a side on which the laser forming process has been performed. 6. A dynamic pressure bearing is formed by mounting a shaft member and a bearing member so as to be relatively rotatable, and a hub for holding a recording medium disk on a disk mounting surface is fixed via the dynamic pressure bearing. In a method of manufacturing a disk drive device rotatably supported on a frame side, a bearing set is configured by assembling the shaft member in advance on the dynamic pressure bearing side, and the bearing set is configured. After joining the shaft member or the bearing member to the fixed frame or the hub, while rotating the hub, the parallelism of the disk mounting surface with respect to the reference surface of the fixed frame is measured. For those that are out of the specified range, laser forming is performed by irradiating laser light to an appropriate position on the fixed frame side, and the parallelism of the disk mounting surface is specified. To the extent that fits within manufacturing method for a disk drive being characterized in that so as to displace at least axially the fixed frame. 7. An auxiliary frame member or an intermediate member made of an iron-based material suitable for laser forming at least at a laser forming portion of the fixed frame. Disk drive method. 8. The method according to claim 6, wherein the fixed frame is displaced toward a side on which the laser forming process has been performed. 9. A structure in which a hub for holding a recording medium disk on a disk mounting surface is rotatably supported on a fixed frame side via a dynamic pressure bearing in which a shaft member and a bearing member are rotatably mounted. A drive circuit for driving the disk drive device to rotate the hub at a constant speed, and irradiating laser light to an appropriate position on the fixed frame side to perform laser forming processing. A laser oscillation device, a rotation detector that detects a rotation position of the hub, a parallelism detector that measures and outputs an axial displacement amount of a disk mounting surface of the hub with respect to a reference surface of the fixed frame, The measurement signal output from the parallelism detector is compared with the actual displacement value of the laser forming process stored in advance and irradiated from the laser oscillation device. A laser irradiation control device that calculates an irradiation position and an irradiation amount of the laser light, and appropriately operates the laser oscillator based on the calculation result; and an automatic parallelism repair device including: Equipment manufacturing equipment. 10. The disk drive manufacturing apparatus according to claim 10, wherein the laser oscillator of the automatic parallelism repairing device comprises a YAG laser oscillator. 11. A laser irradiation control device of the automatic parallelism repair device, comprising: a light emission delay circuit that adjusts an output timing from a laser oscillator based on the calculation result; and an output power from the laser oscillator based on the calculation result. The apparatus for manufacturing a disk drive device according to claim 10, comprising: a light emission power adjustment circuit that adjusts the light emission power; and a light emission time adjustment circuit that adjusts the output time from the laser oscillator based on the calculation result. .