JP2003284284A - Information writing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information writing device capable of writing information onto a plurality of disk-like storage media with accuracy. <P>SOLUTION: A motor portion 40 of a spindle motor 3 comprises a base 42 connecting to the lower part of a bearing portion 39; a coil unit 43 screwed onto the bottom in the base 42; and a rotor assembly 44 which is fixed at the upper part of a spindle 8 and rotated together with the spindle 8. The coil unit 43 comprises a cylindrical portion 46 having a plurality of annularly disposed armature coils. The rotor assembly 44 is made of a magnetic material and has an outer cylindrical portion 48 and an inner cylindrical portion 49 which are faced to each other with the cylindrical portion 46 in-between. Field permanent magnets 50 which are faced to the armature coils in the radial direction are bonded to the inner circumferential surface of the outer cylindrical portion 48. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information writing device for writing information on a disk-shaped information storage medium such as a magnetic disk.

[0002]

There is a hard disk drive (hereinafter referred to as HDD) as an information storage device provided with a disk-shaped information storage medium such as a magnetic disk. The HDD device includes a spindle motor, a disk loading hub detachably mounted on a rotation shaft of the spindle motor and having one or a plurality of magnetic disks stacked therein, and information is written to and read from the magnetic disks. It is configured to include a magnetic head and the like. In the HDD device, normally, after the device is assembled, the magnetic head included in the device writes servo information on a magnetic disk.

On the other hand, the applicant of the present invention invented an information writing device capable of simultaneously writing information on a large number of disc-shaped storage media, and filed a prior application (Japanese Patent Laid-Open No. 2001-2).
16750). By using such an information writing device, the servo information writing processing efficiency can be significantly improved.

Like the above-mentioned HDD device, the information writing device is detachably mounted on the rotary shaft of the spindle motor, and has a disc loading hub in which a large number of magnetic discs are stacked, and a number corresponding to the magnetic discs. And a magnetic head provided at a predetermined interval.

In this case, the disk loading hub provided in the information writing device has a longer axial dimension than the HDD device because of the large number of magnetic disks. Therefore, a slight shaft shake or vibration of the spindle motor is recorded as a track shake of the servo information. Therefore, in the information writing apparatus, it has been desired to reduce shaft runout and vibration during driving of the spindle motor and further improve the rotation accuracy, in other words, further improve the servo information writing accuracy.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an information writing device capable of writing information to a plurality of disc-shaped storage media with high accuracy. .

[0007]

According to a first aspect of the present invention, there is provided an information writing apparatus in which a spindle motor and a plurality of disk-shaped storage media detachably attached to a rotation shaft of the spindle motor are coaxially arranged at predetermined intervals. And a magnetic head for writing information on the disk-shaped storage medium mounted on the disk-mounted hub are stacked at a predetermined interval corresponding to the number of the disk-shaped storage medium. A head laminated assembly, a rotary positioner that detachably supports the head laminated assembly and moves and positions the magnetic head to a predetermined position on the corresponding disk-shaped storage medium, and the magnetic head of the disk-shaped storage medium. Unloading means for unloading to the outer peripheral side, the rotary shaft of the spindle motor and the rotary position And a moving mechanism that relatively moves the spindle motor and the rotary positioner along a direction in which the distance between the spindle motor and the rotary positioner changes, and the spindle motor has a stator having a plurality of armature coils arranged in an annular shape. A rotor that has a field permanent magnet facing the armature coil and that rotates integrally with the rotating shaft; and the rotation that is provided so as to sandwich the armature coil between the rotor and the field permanent magnet. It is characterized by comprising a rotating body made of a magnetic body that rotates integrally with the shaft.

In the above structure, the rotating body facing the field permanent magnet with the armature coil interposed therebetween functions as a stator yoke, forms a magnetic path with the field permanent magnet, and is integral with the rotor. Rotate to. Therefore, the magnetic attraction force acting between the permanent magnet and the rotating body is reduced. Therefore, it is possible to reduce unnecessary vibration generated in the opposing direction of the permanent magnet and the armature coil, and it is possible to realize highly accurate rotation in which the shaft runout and vibration of the rotary shaft are suppressed as much as possible.

In this case, the armature coil and the field permanent magnet may be arranged to face each other in the radial direction (the invention of claim 2) or to face each other in the axial direction. (Invention of Claim 3). In any of the configurations, shaft runout and vibration of the rotary shaft can be reduced, and information can be written with high accuracy in the disk-shaped storage medium.

According to another aspect of the information writing apparatus of the present invention, a plurality of air core-shaped armature coils are connected to the electric wiring on a flexible printed wiring board having electric wiring formed by printing. The stator can be easily configured by deforming the one fixed in the state into a tubular shape (the invention of claim 4).

Further, the disk loading hub is detachably supported on a portion of the rotary shaft of the spindle motor projecting above the spindle motor, and a portion of the rotary shaft located inside the spindle motor. At least one of the disc loading hubs may be provided with a balance adjusting member in which a fluid having a specific gravity of 1 or more is enclosed (a fifth aspect of the invention). Since the balance adjusting member acts to adjust the imbalance, the rotation accuracy can be further improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. First, the overall configuration of the information writing apparatus according to the present embodiment will be described with reference to FIGS. This information writing device 1
This is for writing servo information such as track information and position information on a magnetic disk (corresponding to a disk-shaped storage medium) incorporated in a hard disk drive (HDD device). Since the configuration of the HDD device is well known, illustration and description thereof will be omitted here.

The information writing device 1 corresponds to the spindle motor 3 fixed on the base 2, a disk assembly 5 provided on the spindle motor 3 and having a plurality of magnetic disks 4, and the magnetic disk 4. Rotary positioner 7 for detachably supporting a number of magnetic heads 6
Equipped with.

A rod-shaped mounting jig (not shown) is fixed to a portion of the spindle shaft 8 which is the rotating shaft of the spindle motor 3 and protrudes above the spindle motor 3, and a disc is fixed to this mounting jig. The loading hub 9 is detachably attached. The disk loading hub 9 includes a disk-shaped base portion 10 and a shaft portion 11 projecting from the base portion 10 and inserted into the mounting jig. A magnetic disk 4 is detachably mounted. The lowest magnetic disk 4 is the reference magnetic disk 4a. A spacer ring 12 is mounted between the magnetic disk 4 and the reference magnetic disk 4a.

A disc retainer 13 is attached to the uppermost portion of the shaft portion 11 via a spacer ring 12. The magnetic disk 4, the spacer ring 12, and the reference magnetic disk 4 a are fixed to the disk loading hub 9 by the disk retainer 13. As described above, the disk assembly 5 is composed of the disk retainer 13, the magnetic disk 4, the spacer ring 12, the reference magnetic disk 4a, and the disk loading hub 9. The disc assembly 5
Attach the disc loading hub 9 to the mounting jig from above,
It is detachably attached to the spindle motor 3 by being fixed with a fixing screw 14.

An annular hollow portion (not shown) centering on the shaft center of the spindle shaft 8 is provided inside the disc retainer 13, and water is sealed in the hollow portion. With such a configuration, the disc retainer 13 functions as a balance adjusting member. Then, the disk assembly 5 is rotationally driven by the spindle motor 3 at a predetermined rotation speed, for example, 4200 rpm.

On the other hand, the rotary positioner 7 includes the base 2
It is provided on a movable table 15 movably provided above. On the base 2, a pair of parallel guide rails 1
6 is laid and a feed screw 17 located between the guide rails 16 and parallel to the guide rails 16 is attached. On the lower surface of the movable table 15, a groove portion 18 corresponding to the guide rail 16 and a screw guide 19 that meshes with the feed screw 17 are attached.

A stepping motor 20 for rotating the feed screw 17 is connected to the tip of the feed screw 17. Therefore, by driving the stepping motor 20, the movable table 15 is reciprocated along the guide rail 16. The movable table 15, the guide rail 16, the feed screw 17, the groove portion 18, the screw guide 19, and the stepping motor 20 constitute a moving mechanism 53.

The rotary positioner 7 is a movable table 1.
5, a support frame 23, which is composed of a vertically standing upright portion 21 and a horizontal portion 22 extending from the upper end of the upright portion 21 and parallel to the movable table 15, the movable table 15 and the horizontal portion 22.
And the spindle shaft 8 of the spindle motor 3 supported between
With a pivot 24 parallel to the. A cylindrical hub 25 is rotatably supported on the pivot 24. The hub 2
5, a head stacking assembly 27, in which the magnetic head assemblies 26 are stacked in the number of double the number of the magnetic disks 4, is detachably mounted.

The magnetic head assembly 26 has an arm extending from the hub 25, a suspension, and a magnetic head 6 attached to the ends of suspensions via a gimbal spring (neither is shown). Magnetic head assembly 2
The layers 6 are vertically stacked at predetermined intervals so as to face each other. A control board 34 is provided on the movable table 15, and each magnetic head assembly 26 is electrically connected to the control board 34 via a flexible cable 35.

The rotary positioner 7 also includes a voice coil motor 29 (hereinafter referred to as VCM) for rotating and positioning the head stacking assembly 27 with respect to the magnetic disk 4, and a laser encoder 30. VC
M29 is a voice coil 31 attached to the hub 25.
And a pair of yokes 32a and 32b fixed to the upright portion 21 of the support frame 23, and a magnet 33 fixed to one of the pair of yokes 32a and 32b. The voice coil 31, the yokes 32a and 32b, and the magnet 33 all extend in the horizontal direction, and the voice coil 31 is located between the yoke 32a and the magnet 33.

By energizing the voice coil 31, the rotary positioner 7 is rotated. The operation of the rotary positioner 7 is controlled by the control board 34. Further, the rotation of the rotary positioner 7 is limited to a predetermined range by a stopper (not shown).

The laser encoder 30 detects the rotational position of the rotary positioner 7, and the hub 25
Encoder scale 36 that is provided in and extends in the horizontal direction
And an encoder sensor 37 attached to the horizontal portion 22 of the support frame 23 so as to face the encoder scale 36.

Further, on the movable table 15, the magnetic heads 6 of the respective magnetic head assemblies 26 for the magnetic disks 4 are arranged.
A lamp 38 (corresponding to an unloading means) for loading and unloading is provided. The lamps 38 are stacked in the vertical direction at predetermined intervals by the number corresponding to the magnetic head assembly 26. Further, on the movable table 15, the reference magnetic disk 4a of the disk assembly 5 is provided.
A magnetic head (clock head) 54 dedicated to recording and reproducing a clock signal is provided.

In the above structure, the spindle shaft 8 of the spindle motor 3 and the pivot shaft 24 of the rotary positioner 7 are configured to come into contact with and separate from each other as the movable table 15 reciprocates.

Next, the structure of the spindle motor 3 will be described in detail. The spindle motor 3 includes a bearing portion 39,
It is configured to include a motor unit 40 and an encoder 41. The spindle shaft 8 of the spindle motor 3 penetrates the encoder 41, the motor section 40, and the bearing section 39 and extends above the bearing section 39. Although not shown, the bearing portion 39 is composed of a hydrostatic bearing that supports the spindle shaft 8.

The motor section 40 includes a cylindrical container-shaped base section 42 connected to a lower portion of the bearing section 39, a coil unit 43 fixed to the bottom of the base section 42 by a screw 43a, and a base section 42. Positioned spindle shaft 8
The rotor assembly 44 is fixed to the upper part of the rotor and rotates integrally with the spindle shaft 8.

FIG. 5 is a perspective view of the coil unit 43. As shown in FIGS. 3 and 5, the coil unit 4
The reference numeral 3 includes an annular disc portion 45 mounted on the inner bottom portion of the base portion 42, and a cylindrical portion 46 standing on the disc portion 45 and functioning as a stator. The coil unit 43 is configured as follows.

That is, a plurality of air-core armature coils 51 are fixed to a flexible printed wiring board at equal intervals while being connected to the electrical wiring, and then the printed wiring board is deformed into a tubular shape. To form a cylinder. The coil unit 43 is formed by molding the tubular body with resin. At this time, the cylindrical body is located inside the cylindrical portion 46. Further, the thickness dimension of the cylindrical portion 46 is configured to be constant over the entire circumference. Furthermore, the coil unit 4
The inner peripheral surface and the outer peripheral surface of No. 3 are processed so as to have smooth surfaces without irregularities. With such a configuration, the workability of manufacturing the coil unit 43 is improved.

On the other hand, as shown in FIG.
Is a disc portion 4 fixed perpendicularly to the spindle shaft 8.
7, an outer tubular portion 48 extending downward from the outer peripheral edge of the disc portion 47, an inner tubular portion 49 extending downward from the inner peripheral side of the outer tubular portion 48 of the disc portion 47, the outer tubular portion It is composed of a cylindrical permanent magnet for field magnet 50 fixed to the inner peripheral surface of 48. The field permanent magnet 50 is magnetized to have a plurality of poles. The disc portion 47, the outer tubular portion 48, and the inner tubular portion 49 are all integrally formed of a magnetic material. In this embodiment, the outer cylinder portion 48 and the field permanent magnet 50 function as a rotor, and the inner cylinder portion 49 functions as a rotating body.

The cylindrical portion 46 of the coil unit 43 is
The rotor assembly 44 is disposed between the outer cylindrical portion 48 and the inner cylindrical portion 49 at a predetermined distance from the inner peripheral surface of the field permanent magnet 50 and the outer peripheral surface of the inner cylindrical portion 49. That is, in this embodiment, the field permanent magnet 50 and the armature coil 51 are arranged to face each other in the radial direction.

A balance ring 52 (corresponding to a balance adjusting member) is provided on the lower surface of the disc portion 45 of the rotor assembly 44. The balance ring 52 is a disc holder 1 provided on the disc loading hub 9.
As in 3, the structure is hollow, and water is enclosed in the hollow part.

In the information writing apparatus 1 having the above-mentioned structure, the movable table 15 is the pivot 2 of the rotary positioner 7 in the initial state.
4 is held at a position sufficiently separated from the spindle shaft 8 of the spindle motor 3. The head stack assembly 27 is held in an unloaded state by a ramp 38. When the desired servo information is written to the magnetic disk 4, first, a predetermined number of magnetic disks 4 and the reference magnetic disk 4a are loaded on the disk loading hub 9.
The disk assembly 5 loaded with is attached to the jig of the spindle motor 3.

Then, the stepping motor 3 is driven to move the movable table 15 to the disk assembly 5 side, and the movable table 15 is stopped at a position where the spindle shaft 8 and the pivot shaft 24 have a predetermined distance. At this time, the ramp 38 on the movable table 15 is positioned so as to slightly overlap the peripheral edge portion of each magnetic disk 4, and the magnetic head 54 is moved to the reference magnetic disk 4a.
Located opposite to.

Next, after the spindle motor 3 is operated to drive the disk assembly 5 to rotate at a predetermined speed,
Head stack assembly 2 by rotary positioner 7
The magnetic heads 7 are rotated to the disk assembly 5 side, and each magnetic head 6 is loaded on the corresponding magnetic disk 4. Then, the head stacking assembly 27 is rotated and positioned at a preset disk radial position, and the magnetic head 6 writes servo information to each magnetic disk 4.

When the spindle motor 3 is operated and the armature coil 51 is energized, the rotor assembly 44 rotates based on the magnetic flux generated in the armature coil 51 and the magnetic flux generated by the permanent magnet 50. At this time, the outer tubular portion 48 and the inner tubular portion 49 form a magnetic path while rotating integrally while sandwiching the armature coil 51. That is, the inner tubular portion 49 functions as a stator yoke.

Therefore, the magnetic attraction force acting in the radial direction is reduced, and unnecessary vibration in the radial direction can be reduced. Further, the balance ring 52 is provided on the outer periphery of the spindle shaft 8 located in the motor section 40, and the disc retainer 13 also functions as a balance adjusting member. That is, two balance adjusting members axially separated from each other are provided in a portion that rotates with the rotation of the spindle motor 3 to correct the unbalance.

Further, in the bearing portion 39, the spindle shaft 8 is supported by a hydrostatic bearing, and the axial dimension of the bearing is made long. Therefore, it is possible to realize highly accurate rotation in which the shaft runout and vibration of the spindle shaft 8 are suppressed as much as possible, and it is possible to write the servo information on the magnetic disk 4 with high accuracy.

When the servo information of all the tracks is written, the head laminated assembly 27 is rotated to the outer peripheral side of the magnetic disk 4 and each magnetic head 6 is unloaded onto the ramp 38.

Subsequently, after the rotation of the spindle motor 3 is stopped, the movable table 15 is moved in a direction of separating from the disk assembly 5, and the rotary positioner 7 and the ramp 38 are separated from the disk assembly 5 sufficiently. In this state, by removing the disk assembly 5 from the spindle motor 3 and further removing the magnetic disk 4 from the disk loading hub 9, the servo information writing process is completed. The magnetic disk 4 in which the servo information is written is incorporated in each HDD device.

As described above, according to the information writing apparatus 1 according to the present embodiment, the shaft runout and vibration of the spindle shaft 8 during driving can be suppressed as much as possible. Servo information can be written simultaneously with accuracy.

Since the permanent magnet 50 (outer cylinder portion 48) and the stator yoke (inner cylinder portion 49) rotate integrally,
Since the magnetic flux does not change due to rotation, the occurrence of eddy current loss can be suppressed. For this reason, there is an effect that power consumption is low even when rotating at high speed, and high efficiency can be achieved.

FIG. 6 shows a second embodiment of the present invention, and the difference from the first embodiment will be described. The same parts as those in the first embodiment are designated by the same reference numerals. In the second embodiment, the motor unit 40 of the spindle motor 3 is
The configuration is different from that of the first embodiment. That is, the motor unit 40 includes a disk-shaped rotor 61 and a rotor 62 fixed to the spindle shaft 8 at a predetermined interval, and the rotor 6 described above.
1 and the rotor 62, and a disk-shaped stator 63 arranged between them.

The stator 63 is made of resin and is formed by embedding a plurality of air core-shaped armature coils (not shown) arranged in an annular shape inside and integrally molding them.
The first-stage stator 63 is fixed to an intermediate portion of the peripheral wall portion of the base portion 42. The rotating body 62 is made of a magnetic material and functions as a stator yoke.

The rotor 61 is composed of a rotor yoke 64 made of a magnetic material, and an annular permanent magnet 65 for magnetic field fixed to the rotor yoke 64 by, for example, adhesion and facing the armature coil in the axial direction. Rotor yoke 6
A balance ring 52 is fixed to the upper surface of the spindle 4 and to the outer periphery of the spindle shaft 8.

Also in the information writing apparatus 1 having the above structure,
The rotor 61 is generated based on the magnetic flux generated in the armature coil and the magnetic flux generated by the permanent magnet 65 as the armature coil is energized.
That is, the spindle shaft 8 is rotated. At this time, since the rotating body 62 that forms a magnetic path with the permanent magnet 65 rotates integrally with the rotor 61, the magnetic attraction force acting in the axial direction is reduced, and unnecessary vibration in the axial direction can be reduced. . Therefore, as in the first embodiment, shaft runout and vibration of the spindle shaft 8 during driving can be suppressed as much as possible.

The present invention is not limited to the above-mentioned embodiment, and the following modifications and expansions are possible. The balance adjusting member may be provided on either the disk loading hub 9 or the spindle shaft 8 located in the motor unit 40. The liquid sealed in the balance adjusting member is not limited to water, and may be any liquid having a specific gravity of 1 or more. The disk-shaped storage medium may be an optical disk or a magneto-optical disk in addition to a magnetic disk.

[0048]

As is apparent from the above description, in the information writing apparatus of the present invention, a plurality of spindle motors that rotate a disk loading hub capable of mounting a plurality of disk-shaped storage media are arranged in an annular shape. A stator having an armature coil, a rotor having a field permanent magnet facing the armature coil and rotating integrally with the rotating shaft, and the armature coil sandwiched between the permanent magnet. The disk is configured so as to be provided with a rotating body made of a magnetic body that rotates integrally with the rotating shaft, and is configured to enable highly accurate rotation while suppressing shaft runout and vibration of the rotating shaft as much as possible. Information can be written in the storage medium with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing an information writing device according to a first embodiment of the present invention with a part thereof omitted.

FIG. 2 is a plan view showing a part of the information writing device with a part omitted.

FIG. 3 is a side view showing a part of the disc assembly and the spindle motor in a cross section.

FIG. 4 is a side view of the rotary positioner.

FIG. 5 is a perspective view of a coil unit.

FIG. 6 is a diagram corresponding to FIG. 3 showing a second embodiment of the present invention.

[Explanation of symbols]

In the figure, 1 is an information writing device, 3 is a spindle motor, 4
Is a magnetic disk (disk-shaped storage medium), 6 is a magnetic head, 7 is a rotary positioner, 8 is a spindle shaft (rotating shaft), 9 is a disk loading hub, 13 is a disk holder (balance adjusting member), and 27 is a head stacking assembly. , 38 is a lamp (unloading means), 46 is a cylindrical portion (stator), 48 is an outer cylindrical portion (rotor), 49 is an inner cylindrical portion (rotating body), 50 is a permanent magnet for field magnetism, and 51 is an armature coil. , 52 are balance rings (balance adjusting members), 53
Is a moving mechanism, 61 is a rotor, 62 is a rotating body, 63 is a stator, and 65 is a field permanent magnet.

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 21/22 H02K 21/22 M 21/24 21/24 M (72) Inventor Yasuo Mogi Two Suehirocho, Ome City, Tokyo F-term in Toshiba Ome Plant, 9th Street Co., Ltd. (reference) 5D096 WW02 5D109 BA12 BA14 BA17 BA20 BA30 DA20 5H605 AA04 AA05 BB05 BB10 BB19 BB20 CC03 DD09 EA02 5H621 AA04 BB07 GA11 GB01 HH01 JK07

Claims (5)

[Claims] 1. A spindle motor, a disk loading hub removably attached to a rotation shaft of the spindle motor, and capable of coaxially loading a plurality of disk-shaped storage media at predetermined intervals, and the disk loading hub. A magnetic head for writing information on the disk-shaped storage medium, which is stacked at a predetermined interval corresponding to the number of the disk-shaped storage medium, and a detachable head-stack assembly. A rotary positioner that supports and moves and positions the magnetic head to a predetermined position on the corresponding disk-shaped storage medium; unload means that unloads the magnetic head to the outer peripheral side of the disk-shaped storage medium; The spin along the direction in which the distance between the rotary shaft and the rotary positioner changes. An information writing device including a moving mechanism that relatively moves the rotary motor and the rotary positioner, the spindle motor includes a stator having a plurality of armature coils arranged in an annular shape, and a field facing the armature coil. From a rotor having a magnetic permanent magnet and rotating integrally with the rotating shaft, and a magnetic body provided so as to sandwich the electronic coil between the field permanent magnet and rotating integrally with the rotating shaft. An information writing device, comprising: 2. The information writing device according to claim 1, wherein the armature coil and the field permanent magnet are configured to face each other in the radial direction. 3. The information writing device according to claim 1, wherein the armature coil and the field permanent magnet are configured to face each other in the axial direction. 4. The cylinder is a stator in which a plurality of air-core armature coils are fixed in a state of being connected to the electric wiring on a flexible printed wiring board having electric wiring formed by printing. 3. The information writing device according to claim 2, wherein the information writing device is configured by deforming into a shape. 5. The disk loading hub is detachably supported on a part of the rotary shaft of the spindle motor projecting above the spindle motor, and the part located inside the spindle motor and the part of the rotary shaft. 5. The information writing device according to claim 1, further comprising a balance adjusting member in which at least one of the disk loading hubs is filled with a fluid having a specific gravity of 1 or more.