JPH09219059A - Disk rotation mechanism for disk recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability of an assembling process of a disk and a write-in process of servo information by using a disk loading member capable of collectively dealing with plural disks as a disks group. SOLUTION: The disk loading member 20 in the state holding respective disks 2 is attached to a rotary shaft 13. Then, the member 20 is fixed to a rotary shaft binding part 15 by a binding screw 12. The rotary shaft 13 is attached to a fixed pole shaft of a spindle motor mechanism 3. Then, plural disks 2 are collectively dealt with as a disks group by the disk loading member 20 independently of a disk rotation mechanism of an HDD.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc rotating mechanism applied to a disc recording / reproducing device such as a hard disc device.

[0002]

2. Description of the Related Art Conventionally, in a particularly small hard disk drive (HDD), as shown in FIG. 5, a plurality of disks 2 are usually fixed to a spindle motor mechanism 3 inside a housing 1 which is the main body of the apparatus. In this state, the disk 4 is rotated at a high speed, and data is recorded and reproduced by the head 4 on each disk 2. The head 4 is a recording / playback inductive type head or a recording / playback separation type head using a read-only MR head.

The head 4 is supported by a head suspension 5, and a driving force from an actuator carriage (having a voice coil motor) 7 is transmitted via an actuator arm 6. The head 4 is controlled to move in the radial direction of the disk 2 which is rotating at high speed, and executes recording / reproducing of data with respect to a target track designated by a disk controller (not shown). The reproduction signal reproduced by the head 4 is passed through the head lead wire to the head preamplifier 8 mounted on the internal circuit board.
Is amplified by and is transferred to the disk controller via the flexible cable 9. Also, on the same route,
The recording data from the disk controller is transferred to the head 4. The head 4 converts the recording data into magnetic information and records it on the disk 2.

The head 4 is subjected to movement control and position control by the actuator carriage 7 and reproduces servo information necessary for each control from the servo area of the disk 2. CPU mounted on the circuit board
Performs movement control and position control of the head 4 based on the reproduced servo information.

On the other hand, each disk 2 is, as shown in FIG. 6, a rotary shaft (rotary shaft) of a spindle motor mechanism 3.
The spacers 13 are mounted on the base plate 13 and are held at predetermined intervals by members called spacers 10. Further, the uppermost surface side of each disk 2 is axially pressed by the disk pressing member 11. At this time, the disc pressing member 11 is fastened to the rotating shaft 13 by the screw 12, and applies an axial load to each disc 2. With such a structure, each disk 2 rotates integrally with the rotary shaft 13 by the driving force of the spindle motor mechanism 3.

In the manufacturing process for assembling the HDD as described above, there is a step of recording the servo information on the disk 2 (usually the final step). Normally, a virgin disk on which servo information is not recorded is incorporated in the spindle motor mechanism 3.

Servo information is recorded in an area corresponding to the servo area of the disk 2 by a dedicated servo information writing device, as shown in FIG. The servo information writing device is attached to the HDD with the top cover open, and the drive pin 21 held by the drive plate 20 is brought into point contact with the head arm 6 to control the positioning of the head 4 (see FIG. 8). reference). The rotary encoder 22 monitors the rotational displacement of the drive plate 20 and sends it to a controller (not shown). The controller calculates the positioning amount of the head 4 corresponding to the track position with respect to the target position based on the rotational displacement of the drive plate 20, and drives and controls the linear motor 23 by an amount corresponding to this positioning amount. Linear motor 2
The linear displacement of 3 is converted into a rotational displacement by the rotational displacement converter 24 to drive the drive plate 20.

By performing such a series of operations,
In the area corresponding to the predetermined servo area of the track position,
Servo information will be written by the head 4. At this time, the timing clock previously written on the outermost peripheral side of the disk 2 is reproduced by using the timing head 25 of the servo information writing device. The head 4 writes servo information at the write timing based on this timing clock.

In this way, in the final step of the HDD manufacturing process, servo information is recorded by the head 4 of the HDD on the disk 2 already incorporated in the apparatus body by using a dedicated servo information writing device. To be done. In recent years, the storage capacity of small HDDs has been increased,
It is common to incorporate a plurality of discs 2 together with the improvement of the recording density per disc.

However, the process of assembling a plurality of disks 2 into a small (thin) HDD has a very low productivity, and assembling workability deteriorates in proportion to the number of disks.
Also, regarding the process of recording servo information by using the servo information writing device after assembling a plurality of disks, the number of tracks on the entire disk increases as the storage capacity of the disk increases. The information writing time is getting longer. Therefore, the productivity of the servo information recording process is also very poor. Further, along with the development of a new HDD, it is necessary to develop a dedicated servo information writing device. In particular, in recent years, the product cycle of a small HDD is very short, so that a huge amount of development cost is required to develop a servo information writing device following this.

[0011]

As described above, in the recent large-capacity small HDD, the step of incorporating a plurality of disks in the manufacturing process is fixed by stacking on a spindle motor mechanism of a thin casing. Work efficiency is poor. In order to stack a plurality of discs, it is necessary to fix them to the spindle motor mechanism with a spacer interposed between the discs, resulting in a decrease in work efficiency.

Further, in the final step of the manufacturing process, the dedicated servo information writing device is fixed to the HDD incorporating the disk to record the servo information. Therefore, it is necessary to prepare a high-performance dedicated servo information writing device according to the type of HDD. Further, in order to improve the productivity of the HDD, a plurality of servo information writing devices are needed.

Therefore, as the capacity of a small HDD increases,
It is important to realize a process of efficiently incorporating as many discs as possible into the limited internal space of the main body of the apparatus and improve work efficiency of the assembling process. In addition, a servo information writing process with high accuracy and high work efficiency is also important.

An object of the present invention is to improve the work efficiency of the process of incorporating a plurality of disks in a small-capacity HDD with a large capacity, and to realize a servo information writing process with high accuracy and good work efficiency. is there.

[0015]

SUMMARY OF THE INVENTION The present invention is a method of fixing a plurality of disks to a disk rotating mechanism directly, as opposed to a method of fixing a plurality of disks to a disk rotating mechanism via a dedicated disk mounting member for holding the plurality of disks. Disk recording / reproducing apparatus. With this disc mounting member, in the assembly process of the device, it is possible to handle not a disc as a unit of one disc but a disc group in a state of being stacked with a spacer interposed. Therefore, it is not necessary to assemble a single disk into a small device cabinet with a limited space, and it is possible to assemble a group of multiple disks into the device cabinet at once. Becomes further,
By mounting the disc mounting member to the servo information writing device provided with a dedicated disc rotation mechanism, the servo information can be recorded on each disc with high accuracy.

According to the present invention, instead of directly fixing each disk to the spindle motor mechanism inside the housing of the apparatus, the disk group can be collectively attached to the spindle motor mechanism via the disk mounting member.
Therefore, since it is not necessary to directly fix the magnetic disks one by one to the spindle motor shaft inside the casing as in the conventional case, the working efficiency is greatly improved and the cost can be reduced. In the future, it will be possible to greatly contribute to the miniaturization, large capacity, low cost, and low price of HDDs that accelerate.

Further, once the magnetic disk group incorporated in the disk mounter is fixed, its geometrical position is fixed. Therefore, when writing servo information,
It is possible to write using a high-performance, high-rigidity positioning information writing device, which is installed in a place where the degree of external environmental vibration and environmental cleanliness is kept at a high level, and which is much lower than the spindle motor vibration of the magnetic disk unit. It will be possible. Furthermore, the servo information writing device is an HD
In order to simulate the trajectory of the D head, it suffices to make the spindle motor rotation center and the head actuator rotation center of the writing device match the geometrical shape of the target magnetic disk device. It can be handled easily. Therefore, there is no need to newly develop a servo information writing device for each HDD model, and it is possible to upgrade at a much lower cost. Also, H
Since the servo information can be written in a process different from the DD assembling process, the productivity can be improved.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a disk rotating mechanism relating to the first embodiment, and FIG. 2 is an exploded view for explaining an assembling process of the disk rotating mechanism of the present embodiment. (Disk Rotation Mechanism of First Embodiment) The disk rotation mechanism of the present embodiment is a so-called cantilever structure mechanism,
Usually a small HDD with a fixed number of disks 2 or less
Applied to In the disk rotating mechanism of the present embodiment, each disk 2 has a rotating shaft 1 of a spindle motor mechanism 3.
The disc mounting member 2 is not fixed directly to the disc 3
Fixed through 0.

The disc mounting member 20 is a dedicated disc holder for stacking and holding a plurality of discs 3 with the spacers 10 interposed therebetween. This disc mounting member 20
Is fixed to the rotary shaft 13 by the fastening screw 12, so that the rotary motion is performed integrally with the rotary shaft 13.

The discs 2 are laminated at predetermined intervals with a spacer 10 interposed therebetween in the axial direction, and the disc pressing member 1 is formed.
It is fixed to the disc mounting member 20 by 1. The disc pressing member 11 is fixed to the upper surface of the disc mounting member 20 by fastening screws 14a and 14b so as to press the disc 2 with a uniform load in the axial direction. (Assembling Step of Disk Rotating Mechanism) An assembling step of such a disk rotating mechanism will be described with reference to FIG.

First, three discs 2 are mounted on the disc mounting member 20 in the axial direction with a spacer 10 interposed therebetween. The lowermost disc 2 is mounted on the bottom portion 20b of the disc mounting member 20. However, the spacer 10 may be interposed between the bottom portion 20b and the disc 2 depending on design specifications.

When the three discs 2 are mounted by the spacer 10 at a predetermined interval, the disc pressing member 11 is attached and the fastening screws 14a, 14b are in contact with the uppermost disc 2 as described above. It is fixed to the upper surface 20a of the disk mounting member 20 by.

Next, the disc mounting member 20 holding each disc 2 is attached to the rotary shaft 13.
At this time, the positioning pin 16 at the bottom of the rotary shaft 13
Thus, the disc mounting member 20 is positioned. Then, it is fixed to the rotary shaft fastening portion 15 by the fastening screw 12. The rotary shaft 13 is attached to the fixed pole shaft 13 a of the spindle motor mechanism 3. (Second Embodiment) The second embodiment is a case where it is applied to a mechanism having a double-sided structure as shown in FIG. 4, and the disc mounting member 20 is attached to a rotating member 41 called a hub, and a fastening screw 42a. , 42b. The rotating member 41 is a fixed shaft 40 fixed to a base (housing) of the device.
It has a spindle motor built in and rotates around.

The other structures and assembling steps are basically the same as those in the case of the cantilever structure in the first embodiment described above. However, the disc mounting member 20 portion of the present embodiment is offset because the upper surface portion has a portion for fixing the disc pressing member 11 and a portion for fixing to the rotating member 41.

According to the above first and second embodiments,
The disk mounting member 20 independent of the disk rotation mechanism of the HDD allows the plurality of disks 2 to be collectively handled as a disk group. Therefore, in the HDD assembling process, it is not necessary to assemble one disk in a housing having a limited space, and the disk mounting member 20 is handled to rotate a plurality of disks 2 in a batch. It can be incorporated into the mechanism. This makes it possible to dramatically improve the work efficiency of the assembly process as compared with the conventional assembly process. (Third Embodiment) The third embodiment relates to a servo information writing apparatus using the above-mentioned disk mounting member 20. FIG. 3 is a diagram showing a dedicated servo information writing device having a disk rotation mechanism.

This writing device has a spindle motor mechanism 31 having a rotary shaft 13 for rotating the disk 2.
A rotary drive type positioning actuator 30, a timing head 32, and a servo information writing head 33.
And

For such a writing device, the disk mounting member 20 is fixed to the rotary shaft 13 as described above. Then, the timing clock written on the outermost peripheral side of the disk 2 is reproduced by the timing head 32. Servo information is recorded by the servo information writing head 33 at the write timing by this timing clock.

By using such a writing device, it is not necessary to fix and write the servo information writing device in the HDD incorporating the disc, and it is possible to use the dedicated disc for the disc group mounted on the disc mounting member 20. Servo information can be recorded by the servo information writing head 33. Therefore, the servo information can be collectively recorded before the plurality of disks are incorporated into the HDD, so that the servo information can be accurately and efficiently recorded.

In such a servo information writing method,
With the spindle motor and the high-rigidity actuator 30 as a basic configuration, it is necessary to have a structure in which the spindle motor rotation center and the actuator rotation center match the geometric shapes of the target spindle motor rotation center and actuator rotation center of the HDD. In addition, the head locus of the writing device is H
It is necessary to match the head locus of the DD, or to match the servo information read from the reproducing head when the head positioning control is executed as the HDD within a range that does not affect the positioning control. Normally, if servo information is written on the disc and then the disc is incorporated into the spindle motor, the disc may be deformed differently from the state in which the servo information is written, or the disc inner diameter may be loose due to the pressing force of the disc pressing member. May cause eccentricity. In the conventional servo information writing method using the HDD, eccentricity occurs even at around 50 μm.
Due to the difference in pressing force of the disk retainer, an inclination of about 10 μm occurs between the inner circumference and the outer circumference of the magnetic disk.

On the other hand, by using the disk mounting member 20 as in this embodiment, the positioning pin 1
6 can be used to reduce the amount of eccentricity to an extremely small level, and the pressing force of the disc pressing member 11 can be absorbed once the disc is once fixed to the disc mounting member 20, so that the deformation can be absorbed. Is possible. Therefore, it is possible to write the servo information before incorporating it in the HDD and write the servo information with high accuracy. this is,
Since the information writing device is not fixed directly to the HDD, the disturbance generated between the two can be significantly reduced, and extremely high quality positioning information can be written without including unnecessary vibration components. Is.

Further, the conventional writing device can be used as it is, except for the spindle motor and the actuator section of the servo information writing device, and the writing of servo information can be performed without any change. Furthermore, since the servo information can be written only by exchanging the disk mounting member 20, there is no need to write the servo information in the final step of assembling the magnetic disk device as in the conventional case, and the servo information can be written in a step different from the assembly. Can be written.

[0032]

As described above in detail, according to the present invention, the working efficiency of the disc mounting process and the servo information writing process is particularly improved by the disc mounting member capable of collectively handling a plurality of discs as a disc group. Can be significantly improved, and the productivity of the entire manufacturing process can be improved. Further, in the servo information writing step, it is possible to collectively write the servo information to the disk group with high accuracy as a step different from the apparatus assembling step. As a result, in particular, when the HDD is applied to a small and thin HDD having a large capacity, even when the number of disks increases, it is possible to cope with the efficiency of the assembling work without lowering. Therefore, it is possible to increase the number of disks and increase the capacity without eventually increasing the cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a disk rotating mechanism according to a first embodiment of the present invention.

FIG. 2 is an exploded view for explaining an assembling process of the disk rotation mechanism related to the first embodiment.

FIG. 3 relates to the second embodiment

FIG. 4 relates to the third embodiment

FIG. 5 is a perspective view for explaining the structure of a conventional HDD.

FIG. 6 is a diagram for explaining a disk rotation mechanism of a conventional HDD.

FIG. 7 is a diagram for explaining a conventional servo information writing device.

FIG. 8 is a diagram for explaining a conventional servo information writing device.

[Explanation of symbols]

1 ... Housing (apparatus body) 2 ... Disk 3 ... Spindle motor mechanism 4 ... Head 5 ... Head suspension 6 ... Actuator arm (head arm) 7 ... Actuator carriage (voice coil motor) 8 ... Head preamplifier 9 ... Flexible cable DESCRIPTION OF SYMBOLS 10 ... Spacer 11 ... Disk pressing member 12 ... Screw 13 ... Rotating shaft (rotating shaft) 14a, 14b ... Fastening screw 20 ... Disk mounting member 21 ... Drive pin 22 ... Rotary encoder 23 ... Linear motor 24 ... Rotational displacement converter 25 ... Timing head 30 ... Positioning actuator 31 ... Spindle motor mechanism 32 ... Timing head 33 ... Servo information writing head 200 ... Drive plate

Claims (4)

[Claims] 1. A disk rotating mechanism, which is applied to a disk recording / reproducing apparatus for fixedly holding a plurality of disks which are recording media and rotationally driving each of the disks, comprising: a rotating shaft held by a substrate. A disc mounting member that holds a plurality of discs at an outer peripheral portion at predetermined intervals with a spacer member interposed in the axial direction of the rotating shaft, the disc mounting member having the plurality of discs mounted together with the spacer member. Is mounted on a rotary shaft held by the base body, and the plurality of discs are rotationally driven by the rotary motion of the rotary shaft with the disc mounting member fixed to the rotary shaft. Disk rotation mechanism. 2. A disk rotating mechanism, which is applied to a disk recording / reproducing apparatus for fixedly holding a plurality of disks as recording media and rotationally driving each of the disks, comprising a fixed shaft held by a base body. A hub member that is rotatably engaged with the fixed shaft and is rotated by an internal motor mechanism; and a disk mounting member that holds a plurality of disks at a predetermined interval with a spacer member interposed in the axial direction. And a structure in which the disc mounting member having the plurality of discs attached together with the spacer member is fixed to the hub member, and the plurality of discs are rotationally driven by the rotational movement of the hub member. Characteristic disk rotation mechanism. 3. A disk mounting member applied to a disk rotating mechanism of a disk recording / reproducing apparatus, which holds a plurality of disks as recording media in a fixed manner and rotationally drives each of the disks during data recording / reproduction, A cylindrical body that is detachable from the disk rotation mechanism and that mounts a plurality of disks at predetermined intervals via a spacer member in the axial direction; and each of the disks and the spacers mounted on the cylindrical body. A disk mounting member comprising: a disk pressing member for axially pressing and fixing the member. 4. A servo information writing device comprising a disk rotating mechanism for holding a plurality of disks, which are recording media, fixedly, and rotationally driving each of the disks when recording servo information. A disk mounting member that is detachable with respect to each other and that holds a plurality of disks at predetermined intervals with a spacer member interposed in the axial direction is prepared, and the disk mounting member holding each disk is rotated by the disk rotating member. A servo information writing device, characterized in that the servo information is recorded on each of the disks which are mounted on and fixed to a mechanism and are rotated by the disk rotating mechanism.