JP2002373468A - Disk drive and method and device for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately improve the deflection (A-RRO) of a disk loading face 5b. SOLUTION: Through laser forming work performed by irradiating a proper position on the hub 5 side with a laser beam 5d, the hub 5 is displaced at least in the axial direction, to the extent that the deflection of the disk loading face 5b is brought into a prescribed range. Thus, improvement in the deflection precision of the disk loading face 5b, which is difficult by mechanical forming means, 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 in which a hub for holding a recording medium disk is joined to a rotating shaft rotatably supported via a dynamic pressure bearing, and a method of manufacturing the disk drive. It relates to a manufacturing device.

[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 hard disk drive (HDD) shown in FIG. 10, a fixed bearing sleeve (bearing member) 1
A rotary shaft (shaft member) 2 is rotatably inserted therein, and an oil or magnetic fluid is inserted into a minute radial gap between the inner peripheral surface of the bearing sleeve 1 and the outer peripheral surface of the rotary shaft 2. By injecting such a lubricating fluid, two radial bearing portions RB, RB are formed apart from each other in the axial direction.

The lower end of the rotary shaft 2 in the figure is
A ring-shaped thrust plate 3 is joined by press-fitting, shrink fitting, screwing, or the like, and both end faces in the axial direction of the thrust plate 3 and the bearing sleeve 1,
And a counter plate 4 attached to the bearing sleeve 1 are opposed to each other in the axial direction with a small gap therebetween. The 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 1 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. At least one of the formed radial dynamic pressure generating grooves is an asymmetric groove so as to generate a pumping force toward the lower side in the drawing, which is the inner side of the one-blank space of the bearing sleeve 1. It is formed so as to have a shape.

On the other hand, a rotating hub 5 for holding a recording medium disk, not shown, is joined to the upper portion of the rotating shaft 2 in the figure by press-fitting and shrinking. A recording medium disk (not shown) is inserted into a disk insertion surface 5a formed on the outer peripheral surface of the rotary hub 5, and is positioned in the radial direction. By mounting the inner peripheral portion of the recording medium disk on the disk mounting surface 5b provided so as to protrude outward in a flange shape, the recording medium disk is positioned in the axial direction. It is to be set. The recording medium disk set on the disk mounting surface 5b of the rotary hub 5 in this way is held by a pressing force of a clamper (not shown) screwed to the upper end of the rotary shaft 2 in the figure.

[0006]

However, various types of disk drive devices provided with such dynamic pressure bearings have recently been required to be lighter, thinner and smaller, especially in those mounted on notebook personal computers and mobile information terminal equipment. Since the thickness of the rotary shaft and the hub are rapidly reduced, it is difficult to secure a sufficient joint length in the axial direction when joining the rotary shaft and the hub. As a result, when the hub is rotationally driven, vibration in the axial direction is likely to occur, and the above-described vibration accuracy (A-RR) of the disk mounting surface is increased.
O) tends to fall outside the required range. If the run-out accuracy (A-RRO) of such a disk mounting surface is reduced, the yield of the disk drive is reduced, which may be a factor that hinders the productivity or reliability of the disk drive. Absent.

[0007] Such disk runout accuracy (A
-RRO) also occurs when the hubs are joined in the state of a bearing assembly in which the rotating shaft is mounted on the bearing member side. That is, since the rotating shaft is attached with a play to the bearing member by the amount of the bearing gap, the positional relationship between the hub and the rotating shaft at the time of joining the hub is increased by the play of the rotating shaft. Misalignment, which often results in galling marks in the mounting holes of the hub. And, even with such a galling, the above-described deflection accuracy (A-RRO) of the disk mounting surface is reduced.

In view of the above situation, the present invention provides a disk drive and a disk drive capable of easily and accurately repairing the runout accuracy (A-RRO) of a disk mounting surface. An object is to provide a manufacturing method and a manufacturing apparatus.

[0009]

In order to solve the above-mentioned problems, in the disk drive device according to the first aspect, a laser forming process for irradiating a laser beam to an appropriate position on the hub side is performed. The hub is displaced at least in the axial direction to such an extent that the deflection accuracy of the disk mounting surface falls within a specified range. In other words, even if mechanical forming is used to improve the runout accuracy of the disk mounting surface of the hub, high-precision repair is extremely difficult due to the occurrence of springback, etc. According to the disk drive device of the first aspect, since the laser forming process is employed, the deflection accuracy of the disk mounting surface can be easily and accurately repaired.

According to a second aspect of the present invention, in addition to the first aspect, the hub is joined to the rotary shaft via an annular connecting member, and the annular connecting member is provided. Since the laser forming process is performed on at least one of the two surfaces in the axial direction, the above operation is performed in the annular connecting member.

Further, in the disk drive device according to the third aspect, in addition to the first aspect, the hub is displaced toward the side on which the laser forming process has been performed.
By changing the side on which the laser forming process is performed, it is possible to cause displacement of the hub toward any side in the axial direction.

According to a fourth aspect of the present invention, in addition to the first aspect, an auxiliary hub member made of an iron-based material suitable for laser forming is disposed at least at a laser forming portion of the hub. Therefore, the material of the hub itself can be freely selected.

[0013] On the other hand, in the method of manufacturing a disk drive device according to claim 5, after the hub is joined to the rotating shaft,
While rotating the hub, the runout accuracy of the disk mounting surface is measured, and the laser forming process of irradiating a laser beam to an appropriate position on the hub side with respect to the hub whose measurement result of the runout accuracy is out of the specified range is performed. To the extent that the deflection accuracy of the disk mounting surface falls within a specified range,
The hub is displaced at least in the axial direction. In other words, even if mechanical forming is used to repair the runout accuracy of the disk mounting surface of the hub, high-precision repair is extremely difficult due to the occurrence of springback. According to the manufacturing method of the disk drive device according to the fifth aspect, by employing the laser forming process, the deflection accuracy of the disk mounting surface can be easily and accurately repaired, and
The verticality between the rotation shaft and the hub can be easily and accurately obtained.

According to a sixth aspect of the present invention, in the method of manufacturing a disk drive device, in addition to the fifth aspect, the bearing assembly is configured by previously assembling the rotating shaft with respect to the dynamic pressure bearing side. Since the hub is joined to the rotating shaft of the bearing set, handling of the parts is facilitated.

According to a seventh aspect of the present invention, in the method for manufacturing a disk drive device, in addition to the sixth aspect, a thrust plate constituting a thrust dynamic pressure bearing portion is fitted to the rotary shaft when forming the bearing set. In addition, since the hub is joined to the rotating shaft with the thrust plate, the thrust dynamic pressure bearing portion can be easily assembled.

According to a eighth aspect of the present invention, in the method of manufacturing a disk drive device, in addition to the fifth aspect, a laser forming process of irradiating a laser beam while rotating the hub is performed. In the method of manufacturing a driving device, in addition to the above-described claim 5, a laser forming process of irradiating an appropriate position of the hub with the laser light while moving the laser light with the rotation of the hub stopped is performed. In both cases, renovation will be carried out in the same way.

According to a tenth aspect of the present invention, in addition to the fifth aspect, the hub is provided with a position detecting portion for detecting the origin position, and the origin detecting portion detects the origin. Thus, the runout accuracy is measured while detecting the rotational position of the hub as an angle from the origin position, so that the rotational position of the hub can be detected well with a simple configuration. ing.

Further, in the method of manufacturing a disk drive device according to the eleventh aspect, in addition to the fifth aspect, the hub is joined to the rotation shaft side via an annular connecting member, and the hub is connected to the hub. Since the laser forming process is performed on at least one of the both surfaces in the axial direction of the member, the above-described operation is performed in the annular connecting member.

Further, in the method of manufacturing a disk drive device according to the twelfth aspect, in addition to the fifth aspect, 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 displacement of the hub toward any side in the axial direction.

According to a thirteenth aspect of the present invention, in addition to the fifth aspect, an auxiliary hub member made of an iron-based material suitable for laser forming is disposed at least at a laser forming part of the hub. Since the hub is provided, the material of the hub itself can be freely selected.

According to a fourteenth aspect of the present invention, 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 hub side. A laser oscillation device that performs laser forming processing, a rotation detector that detects the rotational position of the hub, and a shake detector that measures and outputs an axial displacement amount on the disk mounting surface of the hub,
Compare the measurement signal output from the shake detector with the displacement value of the laser forming process stored in advance,
A laser irradiation control device that calculates an irradiation position and an irradiation amount of the laser light emitted from the laser oscillation device, and appropriately operates the laser oscillator based on the calculation result. .

That is, even if a mechanical forming process is used to improve the runout accuracy of the disk mounting surface of the hub, it is extremely difficult to perform high-precision repair due to the occurrence of springback. Claim 1
According to the manufacturing apparatus for a disk drive device according to the second aspect, by employing the laser forming process, the deflection accuracy of the disk mounting surface can be easily and accurately repaired.

Further, in the disk drive manufacturing apparatus according to claim 15, in addition to the above-mentioned claim 14, the laser oscillator of the automatic shake repairing device is a YAG laser oscillator. The above-described laser forming process is reliably performed.

Further, in the disk drive manufacturing apparatus according to the present invention, in addition to the above-mentioned claim, the laser irradiation control device of the automatic vibration correcting device may be configured to output the output timing from the laser oscillator based on the calculation result. An emission delay circuit that adjusts the output power, 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. Because of the provision, the laser forming process is reliably performed while simplifying the apparatus.

According to a seventeenth aspect of the present invention, in addition to the fourteenth aspect, the hub further comprises:
A position detection unit for detecting the origin position is provided, and the position detection unit detects the origin by the rotation detector so that the rotation position of the hub is detected at an angle from the origin position. With this configuration, the rotational position of the hub required for measuring the runout accuracy of the hub can be properly detected with a simple configuration.

[0026]

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. The general structure of the hard disk drive (HDD) is shown in FIG. Therefore, the description of the structure of the entire apparatus will be omitted, and the process of assembling the rotary hub will be described.

First, as shown in FIGS. 1 and 2, when the above-described rotary hub 5 is joined to the rotary shaft 2, the rotary shaft 2 is assembled in a fixed bearing sleeve (bearing member) 1. The bearing set DB is assembled in advance. As described above, the bearing set DB has a rotating shaft (shaft member) 2 rotatably inserted into a fixed bearing sleeve (bearing member) 1, and the inner peripheral surface of the bearing sleeve 1. In the minute gap in the radial direction between the outer peripheral surface of the rotating shaft 2 and
Since the lubricating fluid such as oil or magnetic fluid is injected, the two radial bearing portions R are separated in the axial direction.
B and RB are formed. A ring-shaped thrust plate 3 is press-fitted into the lower end of the rotary shaft 2 in the figure.
Both end faces in the axial direction of the thrust plate 3, the bearing sleeve 1, and the counter plate 4 attached to the bearing sleeve 1 are joined through a small gap in the axial direction. And are arranged facing each other. 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 bearing sleeve 1 assembled to the above-mentioned bearing set DB is formed so as to form a single-bag space in which the upper end in the drawing is open and the lower end in the drawing is closed. Radial bearings RB, R
At least one of the radial dynamic pressure generating grooves formed on each of the bearing sleeves B exerts a pumping force toward the lower side in the drawing, which is the inner side of the one-blank space of the bearing sleeve 1 during the 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 2 assembled to such a bearing set DB protrudes from the upper end opening of the bearing sleeve 1, but is not illustrated for the upwardly projecting portion of the rotating shaft 2. The rotating hub 5 for holding the recorded recording medium disk is joined. That is, the rotating hub 5
A mounting hole 5c is formed in the center of rotation of the rotary shaft 5 in the axial direction, and the mounting hole 5c of the rotary hub 5 is inserted and joined to the rotary shaft 2 side by press-fitting and shrink fitting.

As described above, the recording medium disk is inserted into the disk insertion surface 5a provided on the outer peripheral surface of the rotary hub 5 mounted on the disk drive device and positioned in the radial direction. And a disk mounting surface 5 provided so as to protrude radially outward from the lower end edge of the disk insertion surface 5a in a flange shape.
The inner peripheral portion of the recording medium disk is placed on the recording medium b, and the recording medium disk is set in a state of being positioned in the axial direction. Further, the recording medium disk set on the disk mounting surface 5b of the rotary hub 5 in this manner is held by the pressing force of a clamper (not shown) screwed to the upper end of the rotary shaft 2 in the figure. .

As described above, after or before the rotary hub 5 is joined to the rotary shaft 2 formed in the bearing set DB, the stator set (see reference numeral 6 in FIG. 10) and the drive magnet (see FIG. 10) A drive system such as the reference numeral 7) is mounted, thereby completing the disk drive once. Then, using an automatic run-out repair device as described below, the run-out accuracy (A-RRO) of the disk mounting surface 5b of the rotary hub 5 is measured, and the laser is used in accordance with the measurement result of the run-out accuracy. A forming process is performed on the rotary hub 5 so that the runout accuracy is automatically improved.

That is, in the above-mentioned automatic shake repairing apparatus, as shown in FIG. 3, a motor drive circuit 11 for supplying a predetermined drive current to the drive system of the disk drive having the above-described structure is provided. The motor drive circuit 11 drives the rotary hub 5 to rotate at a constant speed.

Further, the rotary hub 5 of the disk drive device
A laser displacement meter 12 as a shake detector is disposed at a position directly above the disk mounting surface 5b in the axial direction, and laser detection light 12a emitted from the laser The laser light is radiated onto the mounting surface 5b and the reflected light is
2, the light is re-received by the optical disc 2, and the amount of axial displacement of the disk mounting surface 5b, that is, the deflection accuracy (A-RR)
O) is to be measured. The measurement result of the shake accuracy by the laser displacement meter 12 as the shake detector is output to a laser irradiation control device 13 described later through the amplifier 12b.

Further, the disc insertion surface 5a provided on the outer peripheral surface side of the rotary hub 5 is provided with a marking or a concave portion (not shown) as a position detecting portion serving as an origin position in the circumferential direction. The marking or the concave portion is detected by a rotation detector 14 arranged so as to be radially opposed to the disk insertion surface 5a of the rotary hub 5. Then, a timing signal when the marking or the concave portion is detected by the rotation detector 14 is output to a laser irradiation control device 13 to be described later through the amplifier 14a.

Further, a laser irradiation port 15 of a YAG laser oscillator 15 is provided above the rotary hub 5.
a is disposed so as to be at an appropriate distance in the axial direction from the rotary hub 5. This YAG laser oscillation device 15 is composed of the main body 1 of the YAG laser oscillation device 15.
A laser beam 15d for processing is emitted from the laser irradiation port 15a provided at the distal end portion of the optical fiber 15c extending from the optical fiber 15b, and is predetermined in the radial direction of the rotary hub 5. In addition, the apparatus is configured to perform so-called laser forming by irradiating a processing laser beam 15d to an appropriate position. The laser forming process is described in, for example, Journal of the Japan Society for Precision Engineering, Vol. 67, N
o. 2, 2001, page 300 et seq.

On the other hand, the laser irradiation control device 13 includes:
An arithmetic unit 13a is provided for comparing the measurement signal output from the laser displacement meter 12 as the shake detector described above with the displacement actual value stored in advance. The actual displacement value stored in the arithmetic unit 13a is obtained by changing the output power and the output time of the processing laser light with respect to each position on a predetermined circumference in the radial direction while irradiating the position.
The axial displacement of the rotary hub 5 is measured. Then, the actual measurement signal obtained from the above-described laser displacement meter 12 is compared with the actual displacement value at each position in the circumferential direction, and the axis required for the rotary hub 5 is determined based on the comparison result. The amount of directional displacement, that is, the position in the circumferential direction of the processing laser beam to be irradiated, that is, the rotation angle from the detected origin position, the output power, and the output time are calculated by the calculator 13a. It has become.

When the irradiation position of the processing laser beam on the rotary hub 5 is changed in the radial direction, the actual displacement value corresponding to the radial position is measured in advance.

As described above, the laser irradiation control device 1
3, the circumferential position, output power, and output time of the processing laser light to be irradiated calculated by the output timing, output power, and output time from the YAG laser oscillation device 15, respectively. Light emission delay circuit 13b, light emission power adjustment circuit 13
c and the light emission time adjustment circuit 13d so that the light emission delay circuit 13b, the light emission power adjustment circuit 13c, and the light emission time adjustment circuit 13d issue necessary drive control signals to the YAG laser oscillation device 15. It has become.

That is, as also shown in FIG.
From the YAG laser oscillation device 15, a laser beam 15d for processing the required output power at a required timing.
Is emitted to the rotating hub 5 for a required time, and the rotating hub 5 irradiated with the processing laser beam 15d is irradiated with the processing laser beam 15d (illustrated in FIG. (Upper side) to be deformed to be displaced in the axial direction, so that the deflection accuracy (A-RRO) of the disk mounting surface 5b of the rotary hub 5 falls within a predetermined range. The renewal of the run-out accuracy is performed.

At this time, the above-mentioned irradiation with the laser beam 15d may be performed while maintaining the rotating state of the rotary hub 5 when measuring the runout accuracy while rotating the rotary hub 5, or After the measurement of the runout accuracy of the rotary hub 5 is completed, the rotation of the rotary hub 5 is stopped, and the laser irradiation port 1 of the optical fiber 15c described above is stopped.
5a side is moved within an appropriate angular range in the circumferential direction,
Irradiation may be performed while moving the laser beam 15d within an appropriate angular range in the circumferential direction using a galvanometer mirror or the like.

In repairing the deflection accuracy of the disk mounting surface 5b, it is extremely difficult to repair the disk mounting surface 5b with high accuracy due to the occurrence of springback even if mechanical forming is employed. According to the embodiment, by adopting the laser forming process, the deflection accuracy of the disk mounting surface 5b can be easily and accurately repaired.

The laser beam 15d used for the above-described laser forming process can be applied to the rotary hub 5 from below as required, as shown in FIG.

When the material of the rotary hub 5 is made of a material such as resin or aluminum which is not suitable for laser processing, as shown in FIG. Alternatively, the rotary hub 5 may be joined via an auxiliary hub member 21 made of a material suitable for laser forming, for example, an iron-based material such as stainless steel. The auxiliary hub member 21 in the present embodiment has a substantially L-shaped cross section. According to such an embodiment, at least one of the two surfaces in the axial direction of the auxiliary hub member 21 is subjected to the laser forming process, thereby improving the deflection accuracy (A-RRO) of the disk mounting surface 5b. The auxiliary hub member 21
Will be performed.

Further, in the embodiment shown in FIG. 7, a laser forming process is performed on the radially extending portion 21a of the auxiliary hub member 21 having a substantially L-shaped cross section. A plurality of through-holes 5c are formed through the same circumference at appropriate positions of the rotary hub 5 overlapping the radially extending portions 21a of the auxiliary hub member 21. Further, in the embodiment shown in FIG. 8, the outer peripheral edge portion 21c of the auxiliary hub member 21 having a substantially L-shaped cross section in the radial direction is subjected to laser forming so as to perform laser forming. (Shown below)
Irradiate the laser beam 15d from above.

Further, in the embodiment shown in FIG. 9, the substantially cylindrical annular connecting member 22 is
, And the rotary hub 5 is joined to the annular connecting member 22 by laser forming. In such other embodiments, the same operation and effect as those in the first embodiment described above can be obtained. In particular, in each of these other embodiments, the material of the rotary hub 5 itself can be freely selected. Te

As the laser oscillation device used for the laser forming process in the above embodiment, Y
Since it is constituted by an AG laser oscillating device, laser forming processing can be reliably performed with an inexpensive and small-sized device.

Further, in the laser irradiation control device 13 in this embodiment, a light emission delay circuit is provided based on the circumferential position, output power, and output time of the processing laser light to be irradiated calculated by the calculator 13a. 13
b, since a necessary drive control signal is issued to the YAG laser oscillation device 15 from the emission power adjustment circuit 13c and the emission time adjustment circuit 13d, laser forming is performed while simplifying the device. Processing is ensured.

Further, in this embodiment, the rotary hub 5 is provided with a position detecting section for detecting the origin position, and the position detecting section detects the origin by the rotation detector 14, whereby the rotary hub 5 is rotated. Is configured to be detected at an angle from the origin position, so that the rotational position of the rotary hub 5 can be detected well with a simple configuration.

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, the bearing assembly DB is assembled in advance before the rotary hub 5 is joined to the rotary shaft 2. The rotating hub 5 in the joined state is subjected to the laser forming process as described above, so that the perpendicularity between the rotating hub 5 and the rotating shaft 2 is obtained in advance, and then the bearing is formed. A set DB may be configured.

Although a YAG laser oscillation device is used as the laser oscillation device, other laser oscillation devices can be employed in the same manner. 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.

[0052]

As described above, according to the first aspect of the present invention,
The disk drive device according to the present invention performs a laser forming process of irradiating a laser beam to an appropriate position on the hub side, and displaces the hub at least in the axial direction so that the deflection accuracy of the disk mounting surface falls within a specified range. By using laser forming to improve the runout accuracy of the disk mounting surface, which is difficult even if mechanical forming is adopted, the runout accuracy of the disk mounting surface can be easily and accurately repaired. Therefore, the productivity and reliability of the disk drive device can be improved.

The disk drive device according to a second aspect of the present invention is the disk drive device according to the first aspect, wherein the hub is joined to the rotary shaft side via an annular connecting member, and the hub is connected to the hub in the axial direction of the annular connecting member. For at least one of the two sides,
Laser forming processing is performed to easily and accurately correct the deflection accuracy of the disk mounting surface by the displacement of the annular connecting member, so that the productivity and reliability of the disk drive device can be reliably improved. it can.

Further, in the disk drive device according to a third aspect of the present invention, in addition to the first aspect, the hub is displaced toward the side on which the laser forming is performed, thereby changing the side on which the laser forming is performed. As a result, the hub can be displaced toward any side in the axial direction, so that the productivity and reliability of the disk drive device can be reliably improved.

Further, in the disk drive device according to a fourth aspect of the present invention, in addition to the first aspect, an auxiliary hub member made of an iron-based material suitable for laser forming is disposed at least in a laser forming portion of the hub. Thus, since the material of the hub itself can be freely selected, the above-described effects can be further enhanced.

According to a fifth aspect of the present invention, in the method of manufacturing a disk drive device, after the hub is joined to the rotating shaft, the deflection accuracy of the disk mounting surface is measured while rotating the hub, and the deflection accuracy is measured. With respect to the hub whose measurement result is out of the specified range, the hub is subjected to a laser forming process of irradiating a laser beam to an appropriate position on the hub side, and the hub is adjusted so that the deflection accuracy of the disk mounting surface falls within the specified range. At least in the axial direction to improve the deflection accuracy of the disk mounting surface, which is difficult even if mechanical forming is adopted, by laser forming, and to reduce the perpendicularity between the rotating shaft and the hub. At the same time, it is possible to easily and accurately output the positional relationship (squareness) between the rotating shaft and the hub so that it can be output with high accuracy. Because of this, it is possible to easily and accurately repair the runout accuracy of the disk mounting surface, and to easily and accurately obtain the perpendicularity between the rotating shaft and the hub. And reliability can be improved.

According to a sixth aspect of the present invention, in the method of manufacturing a disk drive device, in addition to the fifth aspect, a bearing assembly is configured by assembling the rotary shaft in advance on the dynamic pressure bearing side. Since the handling of the parts is facilitated by joining the hub to the rotating shaft formed in the bearing set, the above-described effects can be further improved.

According to a seventh aspect of the present invention, in the method of manufacturing a disk drive device, the thrust plate constituting the thrust dynamic pressure bearing portion is fitted to the rotary shaft when forming the bearing set. In addition, since the hub is joined to the rotary shaft with the thrust plate to enable easy assembly of the thrust dynamic pressure bearing portion, the above-described effects can be further improved.

According to a eighth aspect of the present invention, there is provided a method of manufacturing a disk drive device, further comprising the step of performing a laser forming process of irradiating a laser beam while rotating a hub. The manufacturing method of the drive device may further include, in addition to the above-described claim 5, performing a laser forming process of irradiating a laser beam to an appropriate position of the hub while moving the laser beam while the rotation of the hub is stopped. Since similar modifications are possible, the same effect can be obtained in any case.

According to a tenth aspect of the present invention, in addition to the fifth aspect, the hub is provided with a position detecting portion for detecting the origin position, and the origin detecting portion detects the origin. By measuring the runout accuracy while detecting the rotational position of the hub as an angle from the origin position, the rotational position of the hub required for measuring the runout accuracy is good with a simple configuration. And the effect described above can be further enhanced.

Further, in accordance with the eleventh aspect of the present invention, in addition to the fifth aspect, in addition to the fifth aspect, the hub is joined to the rotating shaft side via the annular connecting member, and the hub is joined to the hub. A laser forming process is performed on at least one of the two surfaces in the axial direction so that the deflection accuracy of the disk mounting surface can be easily and accurately corrected by the displacement of the annular connecting member. Can be reliably improved in productivity and reliability.

According to a twelfth aspect of the present invention, in addition to the fifth aspect, the hub is displaced toward the side on which the laser forming process is performed so that the side on which the laser forming process is performed is shifted. By making the change, it is possible to cause the displacement of the hub toward any side in the axial direction, so that the productivity and reliability of the disk drive device can be reliably improved.

According to a thirteenth aspect of the present invention, in the method of manufacturing a disk drive device, an auxiliary hub member made of an iron-based material suitable for laser forming is disposed at least at a laser forming part of the hub, and the hub itself is made of a material. Can be freely selected, so that the above-described effects can be further enhanced.

Further, a disk drive manufacturing apparatus according to a fourteenth aspect of the present invention provides a drive circuit for driving a disk drive to rotate a hub at a constant speed, and irradiating a laser beam to an appropriate position on the hub side. A laser oscillation device for performing a laser forming process, a rotation detector for detecting a rotation position of the hub, a shake detector for measuring and outputting an axial displacement amount of a disk mounting surface of the hub, and a shake detection thereof The measurement signal output from the device is compared with the actual displacement value of the laser forming process stored in advance, to calculate the irradiation position and irradiation amount of the laser light irradiated from the laser oscillation device, based on the calculation result, A laser irradiation control device that appropriately operates the laser oscillator, and an automatic shake repair device including the same, even if a mechanical forming process is employed. The improvement of the runout accuracy of the hard disk mounting surface is performed by laser forming, so that the runout accuracy of the disk mount surface can be easily and accurately and automatically corrected. Productivity and reliability can be improved.

According to a fifteenth aspect of the present invention, in addition to the fourteenth aspect, the laser oscillator of the automatic vibration correcting device is a YAG laser oscillator. The forming process is reliably performed, and the above-described effects can be further enhanced.

According to a sixteenth aspect of the present invention, in the disk drive manufacturing apparatus according to the fourteenth aspect, the laser irradiation control device of the automatic shake repairing device further comprises: Based on the directional position, the output power and the 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, thereby simplifying the device. Since the laser forming process is performed reliably, the above-described effects can be further improved.

According to a seventeenth aspect of the present invention, in addition to the fourteenth aspect, the hub is provided with a position detecting unit for detecting the origin position, and the position detecting unit is provided with:
By detecting the origin by a rotation detector, the rotation position of the hub is detected by an angle from the origin position. Therefore, the apparatus can be simplified in addition to the effects described above.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing a process of assembling a hub of a disk drive device according to an embodiment of the present invention.

FIG. 2 is an explanatory longitudinal sectional view showing a state after assembling of a hub of the disk drive device in the embodiment shown in FIG. 1;

FIG. 3 is a block diagram showing a schematic configuration of an automatic shake repairing device according to an embodiment of the present invention.

FIG. 4 is an explanatory longitudinal sectional view showing a run-out repair process according to an embodiment of the present invention.

FIG. 5 is an explanatory longitudinal sectional view showing a run-out repairing step in another embodiment of the present invention.

FIG. 6 is an explanatory longitudinal sectional view showing a disk drive device according to another embodiment of the present invention.

FIG. 7 is an explanatory longitudinal sectional view showing a run-out repairing step according to still another embodiment of the present invention.

FIG. 8 is an explanatory longitudinal sectional view showing a run-out repair process according to still 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 structural example of a hard disk drive (HDD) as an example of the disk drive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing sleeve (bearing member) 2 Rotating shaft 5 Rotating hub 5c Mounting hole 5a Disk insertion surface 5b Disk mounting surface 11 Motor drive circuit 12 Laser displacement meter 12a Laser detection light 13 Laser irradiation control device 13a Operation unit 13b Light emission delay circuit 13c Light emission power adjustment circuit 13d Light emission time adjustment circuit 14 Rotation detector 15 YAG laser oscillation device 15d Processing laser beam 21 Auxiliary hub member 22 Ring connection member DB Bearing set RB Radial bearing portion SBa, SBb Thrust dynamic pressure bearing portion

Claims (17)

[Claims] 1. A disk drive device wherein a rotary shaft is rotatably supported via a dynamic pressure bearing, and a hub for holding a recording medium disk on a disk mounting surface is joined to the rotary shaft. The hub is displaced at least in the axial direction to the extent that the deflection accuracy of the disk mounting surface falls within a specified range by performing a laser forming process of irradiating a laser beam to an appropriate position on the hub side. A disk drive device provided with a dynamic pressure bearing. 2. The laser forming device according to claim 1, wherein the hub is joined to the rotating shaft side via an annular connecting member, and the laser forming is performed on at least one of axially both surfaces of the annular connecting member. The disk drive device provided with the dynamic pressure bearing according to claim 1, wherein the disk drive device is processed. 3. The disk drive device with a dynamic pressure bearing according to claim 1, wherein the hub is displaced toward a side on which the laser forming process has been performed. 4. The dynamic pressure bearing according to claim 1, wherein an auxiliary hub member made of an iron-based material suitable for laser forming is disposed at least in a laser forming portion of the hub. Disk drive. 5. A disk drive in which a rotating shaft is rotatably supported via a dynamic pressure bearing, and a hub for holding a recording medium disk on a disk mounting surface is joined to the rotating shaft. In the method of manufacturing the device, after joining the hub to the rotating shaft, the deflection accuracy of the disk mounting surface is measured while rotating the hub, and the measurement result of the deflection accuracy is out of a specified range. With respect to the hub, a laser forming process of irradiating laser light to an appropriate position on the hub side is performed, and the hub is displaced at least in the axial direction so that the deflection accuracy of the disk mounting surface falls within a specified range. A method for manufacturing a disk drive device, comprising: 6. A bearing assembly is constructed by assembling the rotating shaft in advance on the dynamic pressure bearing side, and the hub is joined to the rotating shaft configured in the bearing assembly. 6. The method for manufacturing a disk drive device according to claim 5, wherein: 7. In forming the bearing set, a thrust plate constituting a thrust dynamic pressure bearing portion is fitted to a rotating shaft, and the hub is joined to the rotating shaft with the thrust plate. 7. The method for manufacturing a disk drive according to claim 6, wherein: 8. The method according to claim 5, wherein a laser forming process for irradiating a laser beam to an appropriate position of the hub is performed while rotating the hub. 9. The disk drive according to claim 5, wherein a laser forming process of irradiating a laser beam while moving the laser beam is performed on an appropriate position of the hub while the rotation of the hub is stopped. Device manufacturing method. 10. A method according to claim 1, wherein the hub is provided with a position detecting section for detecting an origin position, and the deflection accuracy is measured while detecting the rotational position of the hub by detecting the origin of the position detecting section. 6. The method for manufacturing a disk drive device according to claim 5, wherein: 11. The laser forming process, wherein the hub is joined to the rotating shaft side via an annular connecting member, and at least one of the two axial surfaces of the annular connecting member is subjected to the laser forming process. 6. The method for manufacturing a disk drive according to claim 5, wherein the method is performed. 12. The method according to claim 5, wherein the hub is displaced toward a side on which the laser forming process has been performed. 13. The disk drive method according to claim 5, wherein an auxiliary hub member made of an iron-based material suitable for laser forming is disposed at least at a laser forming portion of the hub. . 14. A manufacturing method of a disk drive device, wherein a rotating shaft is rotatably supported via a dynamic pressure bearing, and a hub for holding a recording medium disk on a disk mounting surface is joined to the rotating shaft. A drive circuit that drives the disk drive device to rotate the hub at a constant speed; a laser oscillation device that irradiates a laser beam to an appropriate position on the hub side to perform laser forming; and A rotation detector that detects a rotational position, a shake detector that measures and outputs an axial displacement amount on the disk mounting surface of the hub, and a laser that stores a measurement signal output from the shake detector in advance. Compared to the actual displacement value of the forming process,
A laser irradiation control device that calculates an irradiation position and an irradiation amount of the laser light emitted from the laser oscillation device, and appropriately operates the laser oscillator based on the calculation result; An apparatus for manufacturing a disk drive device, comprising: 15. The apparatus according to claim 14, wherein the laser oscillator of the automatic vibration correcting device is a YAG laser oscillator. 16. A laser irradiation control device of the automatic vibration correcting 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 14, further comprising: a light emission power adjustment circuit that adjusts; and a light emission time adjustment circuit that adjusts an output time from a laser oscillator based on the calculation result. 17. The hub is provided with a position detector for detecting an origin position, and the position detector detects the origin by a rotation detector, thereby detecting the rotational position of the hub. 15. The apparatus according to claim 14, wherein the apparatus is configured as follows.