JP2002251846A - Disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve accurate track positioning by reducing reactive force caused by bending of a flexible wiring board due to rocking of an arm, and low power consumption, and to provide a small type disk device. SOLUTION: This is a disk device provided with a disk 2, a disk driving means 3, a head slider 4 mounted with an information conversion element for performing recording and rocking to the disk 2, an arm 5 for supporting the head slider 4, a bearing part 15 for supporting the arm 5 to be freely rotatable, a rocking means 7 for rocking the arm 5 centering the bearing part 15 as the center of rotation, and a flexible wiring board 11 for connecting the information conversion element with a control circuit for controlling this information conversion element, and the reactive force is reduced by routing the flexible wiring board 11 up to the bearing part 15 along the center line between the head slider 4 and the center of the bearing part 15, and also arranging the flexible wiring board 11 so that the bent deformation of the flexible wiring board 11 due to rocking of the arm 5 is caused on the flexible wiring board 11 routed in the bearing part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus for recording / reproducing a disk-shaped recording medium such as a magnetic disk and an optical disk.

[0002]

2. Description of the Related Art In recent years, the technical progress of a disk recording / reproducing apparatus (hereinafter, referred to as a disk apparatus) for recording and reproducing signals on a disk-shaped recording medium (hereinafter, referred to as a disk) such as a hard disk or an optical disk has been remarkable. Applications are expanding in many fields, not just for conventional computers. In such a disk drive, in addition to higher density recording, a reduction in size and thickness and a reduction in power consumption are required.

FIG. 8 is a plan view of a main part of a conventional disk drive. The disk 2 is supported on the main shaft 1,
Is driven to rotate. As the driving means 3, for example, a spindle motor is used. A head slider 4 having an information conversion element (not shown) for recording and reproducing
The arm 5 is attached to a bearing 6 so that the arm 5 can rotate freely.

The swing means 7 is, for example, a voice coil motor, and swings the arm 5 to move the head slider 4.
Is moved to a predetermined track position. The housing 10 holds these in a predetermined relationship. The housing 10
The disk device is used in a sealed state with a lid (not shown) having substantially the same shape as the disk device.

A flexible circuit board (hereinafter, referred to as FPC wiring) for electrically connecting a control circuit 9 for controlling an information conversion element (not shown) attached to the head slider 4 to the information conversion element. ) 8 is pulled out along the arm 5 to the vicinity of the bearing 6, and this bearing 6
The arm 5 is curved so as to have a sufficient curvature so as not to hinder the swing of the arm 5, is mounted on a connection terminal of the control circuit 9, and is fixed. The control circuit 9 may be arranged outside the housing 10 in some cases. In such a case, the control circuit 9 disposed outside the housing 10 transmits
The connection terminal of the wiring board extending inside the FPC wiring 8 is connected to the FPC wiring 8. In this case as well, the connection is provided to the connection terminal with a curvature that does not hinder the swing of the arm 5. Further, the FPC wiring 8 may be configured to include not only a conductor wiring for an information conversion element but also a conductor wiring for driving the swinging means 7.

In the disk device configured as described above, when the disk 2 is rotated by the driving means 3, an air flow is generated on the disk surface. In this state, the swing means 7 is driven to swing the arm 5 so that the head slider 4
To a predetermined track position. While maintaining such a constant flying height state, the disc 2 is controlled by the control circuit 9 and the information conversion element (not shown) through the FPC wiring 8.
The information recorded on the disk 2 or the information recorded on the disk 2 is reproduced.

When such an FPC wire 8 is used, when the arm 5 is swung by the swing means 7 for positioning to a predetermined track position, the FPC wire 8 is also swung at the same time. Therefore, it is necessary to secure a space in the housing 10 enough to allow the swing. Also,
The reaction force due to bending when the FPC wiring 8 swings is reduced by the arm 5.
Therefore, accurate positioning becomes difficult, and an extra load is applied to the swinging means 7 due to this reaction force, which hinders reduction in power consumption.

As a method for preventing the influence of such FPC wiring, Japanese Patent Laid-Open Publication No. Hei 05-234289 discloses a method of forming a through hole in a shaft of a bearing device for rotatably supporting an arm, thereby forming a torsion conductor as a signal conductor. A configuration is shown in which the battery is passed through the through hole and is also taken out of the housing. With such a configuration, the FP that connects the bearing unit to the control circuit
Eliminating the C wiring makes it possible to reduce the size of the disk device and accurately position the track.

[0009]

In the above disclosed example, a highly flexible torsion conductor is used. However, since such a torsion conductor is thicker than the FPC wiring, the thickness of the arm portion becomes large and the It is difficult to reduce the thickness of the device. Also, F
The configuration for reducing the reaction force by using the PC wiring is not shown in the above-mentioned disclosure example.

[0010] The present invention relates to an FPC capable of thinning an arm.
An object of the present invention is to provide a small and thin disk device by realizing a configuration in which a reaction force against an arm does not act by using wiring.

[0011]

In order to solve the above-mentioned problems, a disk drive according to the present invention comprises an FPC wiring for connecting an information conversion element attached to a tip of an arm to a control circuit, wherein the FPC wiring is connected to a head slider. In this configuration, the wire is routed to the bearing along the center line connecting the center of the bearing, and the bending deformation of the FPC wiring caused by the swing of the arm mainly occurs in the FPC wiring area routed inside the bearing.

With this configuration, even if the arm swings and a bending deformation force acts on the FPC wiring, the arm is deformed by a small force in the FPC wiring area drawn into the bearing portion. The accompanying reaction force can be made very small. Further, the space for storing the FPC wiring inside the housing can be significantly reduced as compared with the conventional case, and a disk device having a small size, low power consumption, and high track positioning accuracy can be realized.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk drive according to the present invention comprises a disk, a driving means for rotating the disk, a head slider having an information conversion element for recording and reproducing information on the disk, and an arm for supporting the head slider. A bearing for rotatably supporting the arm, a swinging means for swinging the arm in the radial direction of the disk about the bearing as a center of rotation, and an information conversion element and a control circuit for controlling the information conversion element. The FPC wiring is routed to the bearing along a center line connecting the head slider and the center of the bearing, and bending deformation of the FPC wiring caused by swinging of the arm is routed into the bearing.
It has a configuration that occurs in the wiring area.

[0014] With this configuration, the FP can be moved with the swing of the arm.
Even if a bending deformation force acts on the C wiring, it can be freely deformed with a small force in the FPC wiring area drawn into the bearing portion, so that the reaction force due to the bending deformation becomes very small. Further, the storage space for the FPC wiring inside the housing can be significantly reduced as compared with the conventional case.

Further, in the disk device of the present invention, the shaft of the bearing portion has a through hole formed in the axial direction, and the FPC wiring is drawn out of the bearing portion through the through hole on the housing side of the bearing portion. It has a configuration in which bending deformation occurs in the FPC wiring region in the through hole. With this configuration, the bending deformation force of the FPC wiring due to the swing of the arm is mainly due to the FPC in the through hole.
It acts on the PC wiring area, and the deformation of this area is caused by a relatively small force, so that the reaction force is also small. In addition, since the FPC wiring is taken out from the housing side on the lower surface of the bearing, the installation location of the control circuit can be freely designed. For example, it can be easily routed to a position inside the housing that was difficult with the conventional configuration, or to the outside of the housing.

Further, in the disk drive of the present invention, the shaft of the bearing portion has a shaft hole formed in the axial direction, and the FPC wiring has a substantially U-shape curved in the shaft hole provided in the bearing portion. At the same time, it is pulled out of the bearing portion from the upper surface portion of the bearing portion, and has a configuration in which bending deformation occurs in the substantially U-shaped portion. With this configuration, the FPC generated with the swing of the arm
Since the bending deformation force of the wiring is applied over substantially the entire U-shaped portion, the wiring can be deformed with a small force, and the reaction force is also reduced. Further, it is not necessary to penetrate the shaft hole provided in the shaft of the bearing portion, and the degree of freedom in selecting and designing the bearing portion is improved.

Further, in the disk device of the present invention, in the FPC wiring area routed in the bearing portion, a slit is formed in the insulating film between the plurality of conductor wirings of the FPC wiring,
It has a configuration in which a plurality of conductor wirings are separated from each other. With this configuration, in the wiring region where the bending deformation force of the FPC wiring mainly acts, the rigidity against bending is significantly reduced, and therefore, a reaction force can be hardly generated. On the other hand, as a whole,
Since it is the C wiring, the assembly does not become complicated.

Further, the disk device of the present invention comprises: a disk; a drive means for driving the disk to rotate; a head slider having an information conversion element for recording and reproducing information on and from the disk; an arm for supporting the head slider; And a bearing having a shaft provided with a plurality of through-conductors penetrating in the axial direction and a connection terminal of the through-conductor on an upper surface thereof, and an arm in a radial direction of the disk with the bearing as a center of rotation. Swing means for swinging the wire at a predetermined swing angle, and FPC wiring in which conductor wiring at one end of the wiring is separated from each other over a predetermined length. The bearing is arranged so as to be symmetrical with respect to a bisector bisecting the FPC, and the FPC wiring is routed along the arm to the bearing, and the above bisecting is performed. It has a structure obtained by connecting to the corresponding connection terminals of the conductor wires to be symmetrical with respect to a line.

With this configuration, the rigidity of the FPC wiring between the opening and the connection terminal against bending can be reduced, so that even if a bending deformation force acts on the FPC wiring due to the swing of the arm, the reaction force due to the bending deformation force is reduced. Rarely occurs. Therefore, accurate positioning and low power consumption of the oscillating means can be achieved. Further, not only can the FPC wiring be shortened, but also the number of assembly steps can be greatly reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 shows a first embodiment of the present invention.
FIG. 2 is a sectional view of a main part of the disk device according to the embodiment, and FIG.
FIG. 2 is a perspective view of a main part of an FPC wiring configuration. The same reference numerals are given to the same elements and names as those of the conventional disk device shown in FIG. Hereinafter, the same applies to the drawings used for describing other embodiments. The bearing portion 15 includes a shaft 60 having a through hole 61 and fixed to the housing 10, an outer ring 63 supported on the shaft 60 via a bearing 62, and a support plate 64 attached to the outer periphery of the outer ring 63. Become. The arm 5 is fixed to the bearing portion 15 so as to be sandwiched between the outer ring 63 and the support plate 64. It is necessary for such a bearing portion 15 that the shaft is of a fixed shaft type and has a through-hole diameter that does not interfere with the FPC wiring 11, but the bearing configuration is not particularly limited. The swinging means 7 is provided on the support plate 64 located on the side opposite to the arm 5.
Are fixed.
In the present embodiment, the oscillating means 7 uses a voice coil motor.
And a yoke 71 provided integrally with the magnet at a position corresponding to.

In the present embodiment, the swing means 7 is a voice coil motor. However, the present invention is not particularly limited to the voice coil motor. Various actuator mechanisms capable of swinging at a predetermined angle in the horizontal direction are used. May be used.

A terminal of an information conversion element (not shown) mounted on the head slider 4 and the FPC wiring 11 are connected near the position where the arm 5 is mounted on the head slider 4. For this connection, for example, wire bonding, soldering, welding, or the like is used. FPC wiring 11 is arm 5
After being routed along the lower surface of the bearing 5 to the opening 51 provided in the arm 5, the upper surface of the bearing 15 is routed from the opening 51, and fixed through the through hole 61 on the housing side of the lower surface of the bearing 15. After that, it is pulled out of the bearing portion 15. The FPC wiring drawn out of the bearing unit 15 may be connected to a control circuit (not shown) provided inside the housing 10 or may be connected to an opening (not shown) provided in the housing 10. (Not shown), and may be drawn out of the housing and connected to a control circuit (not shown) provided outside the housing 10.

The arrangement of the FPC wiring 11 in the bearing 15 will be described in more detail with reference to FIG. The arm 5 has an opening 51 near the bearing 15, and the FPC wiring 11 is drawn out from the lower surface of the arm 5 to the upper surface through the opening 51. Furthermore, this FP
The C wiring 11 is inserted into the through hole 61 provided in the shaft 60 from the upper surface of the bearing unit 15, fixed at the lower surface of the bearing unit 15, and then drawn out of the bearing unit 15. With such a configuration, the FPC wiring 1 in the through hole 61
1 can be deformed with a relatively small force. Therefore, even if a bending deformation force acts on the FPC wiring 11 due to the swing of the arm 5, the reaction force generated by the bending deformation force can be reduced. As a result, accurate positioning of the arm 5 becomes possible, and
Electric power for driving the swinging means 7 can be reduced. In addition, since the FPC wiring 11 is used, the assembling is simple, and even if the wiring is routed along the arm 5, the thickness of the arm 5 hardly increases. Further, the FPC wiring 11 pulled out from the lower surface of the bearing 15 is
Since the arm 5 does not move even if it swings, the control circuit can be installed at a free position near the bearing.

FIG. 3 is a diagram showing a modification of the FPC wiring configuration of the disk device according to the first embodiment. FIG.
Is different from the FPC wiring configuration of FIG.
1 is spirally wound. With such a configuration, the area of the FPC wiring 11 in the through-hole can be lengthened, and the FPC wiring 11 can be deformed with a smaller force, and the reaction force can be further reduced.

(Second Embodiment) FIG. 4 is a perspective view showing a main part of an FPC wiring configuration of a disk device according to a second embodiment of the present invention. In the second embodiment, a shaft hole 67 is provided in a shaft 66 of the bearing portion 16, and the shaft hole 67 is provided in the shaft hole 67.
The PC wiring 11 is inserted so as to have a curved substantially U-shape, and the connection side with a control circuit (not shown) is again connected to the bearing unit 1.
6 and is fixed at the position of the upper surface P of the shaft 66. The depth of the shaft hole 67 can be appropriately designed according to the rigidity of the FPC wiring 11, and a through hole may be used.

The fixing of the FPC wiring 11 is not limited to the position of the upper surface P of the shaft 66, but is
Alternatively, it may be fixed by connecting to a part that does not rotate, a housing surface near the bearing part 16, or directly to a control circuit. further,
As a fixing method, for example, various methods such as an adhesive, an adhesive tape, or a mechanical fixing can be used. With such a configuration, the FPC wiring 11 in the shaft hole 67 can be formed.
Is deformed by a small force, so that almost no reaction force can be generated.

Further, since the FPC wiring 11 is fixed at the position of the upper surface P of the shaft 66, the control circuit is
Can also be placed in the immediate vicinity of.

(Third Embodiment) FIG. 5 is a perspective view of a main part showing an FPC wiring configuration of a disk device according to a third embodiment of the present invention. The difference from the FPC wiring configuration of the first embodiment shown in FIGS.
2 is that, in a length region from the vicinity of the opening 51 of the arm 5 to the lower surface of the through hole 61, a slit is provided in the insulating film between the conductors to provide a separation region 121 separating the conductors. With such a configuration,
Since the rigidity of the separation region 121 against bending can be further reduced, the generation of a reaction force can be more reliably prevented.

In this embodiment, the separation region 121 is used.
Is provided from the opening 51 of the arm 5, but may be provided from the upper surface of the bearing portion 15 to the lower surface of the through hole 61 or only the area of the through hole 61.

FIG. 6 is a diagram showing a modification of the FPC wiring configuration of the disk device according to the third embodiment of the present invention. Similar to the FPC wiring configuration shown in FIG. 5, slits are provided in the insulating film between the conductors in the length region from the vicinity of the opening 51 provided in the arm 5 to the position of the upper surface Q of the shaft 60 so that Are separated from each other, the FPC wiring 13 is fixed at the position of the upper surface Q of the bearing 15, and the FPC wiring 13 is pulled out from the bearing 15 at a predetermined angle.

With such a configuration, the separation region 13 of the FPC wiring 13 routed inside the bearing portion 15
In No. 1, since the rigidity against bending can be reduced, the reaction force can also be reduced. On the other hand, since the FPC wiring 13 is integrally formed as a whole, the assembly is not complicated. Further, only the FPC wiring needs to be changed as compared with the conventional configuration, which is excellent in mass productivity.

In this embodiment, the FPC wiring 13 is fixed at the position of the upper surface Q of the shaft 60 so that a control circuit (not shown) can be disposed immediately near the bearing portion 15. However, the position is not particularly limited to the position of the upper surface Q of the shaft 60, and may be fixed by connecting to a portion that does not rotate in the bearing portion 15, a housing surface near the bearing portion 15, or directly to a control circuit. .

In the present embodiment, the separation region extends from the opening 51 of the arm 5 to the position of the upper surface Q of the bearing 15, but from the upper surface plate 65 of the bearing 15 to the center of the shaft of the bearing 15. It may be. Further, in the present embodiment, a bearing having a through-hole 61 similar to that described in the first embodiment is used as the bearing 15, but in this embodiment, a bearing without a through-hole is used. The same effect can be obtained by using.

Further, with respect to the FPC wiring configuration of the modified example of the first embodiment and the FPC wiring configuration of the second embodiment shown in FIGS. 3 and 4, the separation region described in the third embodiment is also used. If the FPC wiring having the above is used, the reaction force can be further reduced.

(Fourth Embodiment) FIG. 7 is a perspective view showing a main part of an FPC wiring structure as a disk device according to a fourth embodiment of the present invention. The shaft 80 of the bearing portion 17 is formed with a through conductor 81 penetrating in the axial direction and connection terminals 82 and 83 at positions on the upper and lower surfaces corresponding to the through conductor 81. Such processing is, for example, a method in which a predetermined portion of a columnar shaft is drilled to embed the wiring, and fixed with a resin, and a terminal is bonded and fixed to the upper and lower surfaces with a similar resin,
Alternatively, it is possible to use various processing methods such as forming and forming integrally with the wiring using a ceramic material or resin. The bearing unit 17 has the same structure as the bearing unit 15 described in the first embodiment except that such a shaft 80 is used. The bearing 17 is fixed to a housing (not shown) by arranging the connection terminals 82 symmetrically with respect to bisectors that bisect the swing angle of the arm 5. In the FPC wiring 14, a wiring region extending from the vicinity of the opening 51 provided in the arm 5 to the connection terminal 82 of the shaft 80 is separated, and an individual conductor wiring 141 is provided. The individual conductor wiring 141 is arranged so as to be symmetrical with respect to the bisecting line, and then electrically and mechanically connected to the connection terminal 82. This connection method includes, for example, soldering.

With such a configuration, even when the arm 5 swings and a bending deformation force acts on the FPC wiring 14, the rigidity of the individual conductor wiring 141 mainly receiving the bending deformation force against bending is reduced. The reaction force can be reduced. Furthermore, not only can the reaction force be reduced,
The PC wiring can be shortened and the assembly is simplified.

In this embodiment, the connection terminals 83 are also formed on the lower surface of the shaft 80, and the connection terminals 83 are taken out from the bearing portion 17 by the ring-shaped FPC wiring 18 on the lower surface. However, the present invention is not limited to this. Instead, for example, the through conductor 81 may be extended as it is and drawn out of the bearing 17, or the through conductor 81 may be formed using an FPC wiring that is integrated again outside the bearing 17. May be.

[0039]

As described above, the disk drive of the present invention uses the FPC wiring for electrically connecting the information conversion element mounted on the arm and the control circuit for controlling the information conversion element. By arranging the FPC wiring in the bearing portion so as to reduce the rigidity due to bending, even if the arm swings and a bending deformation force acts on the FPC wiring, the reaction force due to the bending deformation force is almost eliminated. This has a great effect that accurate track positioning, low power consumption of the oscillating means, and further downsizing of the device can be realized.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view of a disk drive according to a first embodiment of the present invention;

FIG. 2 is a perspective view of a main part of a flexible wiring board configuration of the disk device according to the first embodiment of the present invention;

FIG. 3 is a perspective view of a main part of a modified example of the flexible wiring board configuration of the disk device according to the first embodiment of the present invention;

FIG. 4 is an essential part perspective view of a flexible wiring board configuration of a disk device according to a second embodiment of the present invention;

FIG. 5 is a perspective view of a main part of a flexible wiring board configuration of a disk device according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a main part of a modification of the flexible wiring board configuration of the disk device according to the third embodiment of the present invention;

FIG. 7 is an essential part perspective view of a flexible wiring board configuration of a disk device according to a fourth embodiment of the present invention.

FIG. 8 is a schematic plan view of a conventional disk drive.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main shaft 2 Disk 3 Driving means 4 Head slider 5 Arm 6, 15, 16, 17 Bearing part 7 Swing means 8, 11, 12, 13, 14 Flexible wiring board (F
PC wiring 9 Control circuit 10 Housing 18 Ring-shaped flexible wiring board (ring-shaped FPC)
51) Openings 60, 66, 80 Shaft 61 Through-hole 62 Bearing 63 Outer ring 64 Support plate 67 Shaft hole 70 Voice coil 71 Yoke 81 Through conductor 82, 83 Connection terminal 121, 131 Separation area 141 Individual conductor wiring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Makoto Miyamoto 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D068 AA01 BB01 CC12 GG01

Claims (5)

[Claims] 1. A disk-shaped recording medium, driving means for driving the disk-shaped recording medium to rotate, a head slider equipped with an information conversion element for recording and reproducing information on and from the disk-shaped recording medium, and supporting the head slider An arm that supports the arm rotatably; a swinging unit that swings the arm in a radial direction of the disk-shaped medium around the bearing as a rotation center; the information conversion element and the information conversion A flexible circuit board for connecting to a control circuit for controlling a recording / reproducing signal of the element, wherein the flexible circuit board is routed to the bearing section along a center line connecting the head slider and the center of the bearing section. The flexible wiring board, wherein bending deformation of the flexible wiring board caused by swinging of the arm is routed into the bearing portion. Disk recording and reproducing apparatus characterized in that a structure generated in the plate region. 2. A shaft constituting the bearing portion has a through hole formed in an axial direction, and the flexible wiring board is drawn out of the bearing portion on the housing side of the bearing portion through the through hole, 2. The disk recording / reproducing apparatus according to claim 1, wherein a bending deformation occurs in the flexible wiring board area in the through hole. 3. A shaft constituting the bearing portion has a shaft hole drilled in an axial direction, and the flexible wiring board has a substantially U-shape curved in the shaft hole provided in the bearing portion. 2. The disk recording / reproducing apparatus according to claim 1, wherein said disk recording / reproducing apparatus is configured to be drawn out of said bearing part from an upper surface part of said bearing part and to cause bending deformation at said substantially U-shaped part. 4. The flexible wiring board region routed in the bearing portion has a slit formed in an insulating film between a plurality of conductor wirings, and the plurality of conductor wirings are separated from each other. The disk recording / reproducing apparatus according to any one of claims 1 to 3, wherein: 5. A disk-shaped recording medium, driving means for driving the disk-shaped recording medium to rotate, a head slider equipped with an information conversion element for recording and reproducing information on and from the disk-shaped recording medium, and supporting the head slider An arm that rotatably supports the arm, and has a shaft provided with a plurality of through wires penetrating in the axial direction and a connection terminal of the through wire at least on an upper surface portion; and rotating the bearing portion. Swing means for swinging the arm at a predetermined swing angle in the radial direction of the disc-shaped recording medium as a center; and a flexible wiring board in which conductor wires at one end are separated from each other over a predetermined length. The bearing portion is arranged such that the connection terminal is symmetrical with respect to a bisector that bisects the swing angle of the arm,
A disk recording / reproducing apparatus, wherein the flexible wiring board is routed along the arm to the bearing portion, and the conductor wiring is connected to the connection terminal in a shape symmetric with respect to the bisector.