JPH07111065A - Storage disk device - Google Patents

Abstract

PURPOSE:To enable stable high-speed rotation by supporting the shaft of a spindle motor at both ends of casings by means of two screws to prevent the eccentricity and the generation of an offtrack of a magnetic disk and further, leading out the lead wire of a coil through the central hole, connecting hole and screw central hole of this shaft. CONSTITUTION:The shaft 21 of the spindle motor is supported at both ends in the casings 10, 11 by means of the screws 40, 43. As a result, the eccentricity and the generation of the offtrack of the magnetic disk are prevented. Further, the shaft 21 is provided with the central hole 211 and the connecting hole 212 for connecting the central hole 211 to the flank in order to lead out the lead wire 220-1 of the coil 20. Further, the screw 43 is provided with the central hole 430. As a result, the lead wire of the coil 220 is lead out through the central hole 211, the connecting hole 212 and the central hole 430 of the screw 43. The mechanical connection of a motor hub 221 and the shaft 211 is, therefore, smoothed and the stable rotation is maintained in spite of the high speed rotation. In addition, production is facilitated.

Description

Detailed Description of the Invention

(Table of Contents) Industrial Application Field of the Prior Art (FIGS. 15 to 16) Problems to be Solved by the Invention Means for Solving the Problems (FIG. 1) Operation

Embodiment (a) Description of first embodiment (FIGS. 2 to 8) (b) Description of second embodiment (FIGS. 9 to 10) (c) Description of third embodiment (FIG. 11) (d) Description of the fourth embodiment (FIG. 12) (e) Description of the fifth embodiment (FIG. 13) (f) Description of the sixth embodiment (FIG. 14) (g) Other Description of Example Effects of the Invention

[0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage disk device using a rotary storage disk such as a magnetic disk, and more particularly to a storage disk device having an improved lead-out mechanism for connecting leads of a spindle motor.

The recording density of magnetic disks has been improved in response to the recent trend toward miniaturization and large capacity of magnetic disk devices. The spindle motor for rotating the magnetic disk needs to be connected to an external printed board.
It is also desired that there is no shaft runout when attached to the housing.

[0005]

15 and 16 are explanatory views (No. 1) and (No. 2) of the prior art. As a conventional method of fixing the spindle motor, there are a double-supported structure shown in FIG. 15 and a pseudo double-supported structure shown in FIG. 16 (B).

An example of the double-supported structure shown in FIG. 15 will be described. In the spindle motor 91, the coil 9 is attached to the fixed shaft 911.
12 are provided. A motor hub 910 is rotatably provided on the shaft 911 via a bearing 913. This spindle motor 91 has a housing 90.
A shaft 911 is screwed to the upper and lower portions of the shaft from both sides by screws 92 and 93. Thereby, both-end support is performed. The lead wire of this coil 912 is the shaft 91
The slit 914 cut in 1 is made to crawl and is connected to the relay printed board 915 under the motor. Then, the relay printed board 915 is connected to a printed board outside the apparatus by a flat cable.

Next, an example of the pseudo double-supported structure shown in FIG. 16B will be described. Also in this example, the configuration of the spindle motor 91 is basically the same as that of FIG. The first difference is that the shaft 911 is screwed to the upper part of the housing 90 with a screw 92, and the shaft 911 is caulked to the lower part of the housing 90. Secondly, a lead wire lead-out hole 911-1 is provided in the center of the shaft 911. Then, the lead wire 916 of the coil 912 is guided to the outside through the lead-out hole 911-1.

[0008]

However, the prior art has the following problems. First, in the method shown in FIG. 15, a slit 914 is provided in the shaft 911, and a lead wire 916 is housed therein to prevent interference with the bearing 913.

Therefore, since the shaft 911 can be held evenly on both sides, eccentricity and off-track can be prevented. However, as shown in FIG.
Since the portion of the slit 914 of No. 1 does not come into direct contact with the bearing 913, it may cause abnormal rotation noise and shorten the service life at high speed rotation. Slit 9 of shaft 911
The 14 machining involves deburring work, which causes a cost increase. Further, since it is necessary to insert the bearing 913-2 while escaping the lead wire 916, workability is reduced, which causes a cost increase. Further, the slit 914
When the lead wire 916 is bonded to the shaft 911 and the bearing 913 is bonded to the shaft 911, the slit 914 and the lead wire 9 are bonded.
It is difficult for the adhesive between 16 to dry, and it flows out later, which may stain the inside of the disk device and cause harmful gas.

Secondly, in the structure shown in FIG. 16B, the above-mentioned lead wire 916 of the coil 912 does not cause any trouble. However, the lower end of the shaft 911 of the spindle motor 91 is not supported at both ends because it is caulked. This causes eccentricity and off-track,
It is difficult to use in a device with high recording density.

Accordingly, it is an object of the present invention to provide a storage disk device equipped with a spindle motor which prevents abnormal rotation, eccentricity and off-track. Another object of the present invention is to provide a storage disk device which has good workability and can prevent eccentricity and off-track.

A further object of the present invention is to provide a storage disk device having a spindle motor mounting structure suitable for automatic assembly.

[0013]

FIG. 1 shows the principle of the present invention. According to claim 1 of the present invention, housings 10 and 11 that form a storage space therein, at least one storage disk 20 provided in the storage space, a center hole 211, and the center hole 211 are connected to a side surface. Has a connection hole 212,
A spindle shaft 21 that supports the coil 220, a motor hub 221 that is rotatably provided on the spindle shaft 21, and supports the storage disk 20, and the housings 10 and 11 for fixing one end of the spindle shaft 21. The first screw 40 and the housing 10, 1
1, the central hole 43 for fixing the other end of the spindle shaft 21 and leading out the lead wire of the coil 220 through the center hole 211 and the connecting hole 212.
A second screw 43 having 0, a head 30 for reading at least information from the storage disk 20, a head 30 supported at the tip, and the head 30 positioned on a desired track of the storage disk 20. And an actuator 32 for

According to claim 2 of the present invention, in claim 1,
A flat cable 46 connected to the lead wire from the center hole 211 of the spindle shaft 21 is provided.

According to a third aspect of the present invention, in the first aspect,
The center hole 211 of the spindle shaft 21 is provided with a connector 60 to which the lead wire is connected.

According to claim 4 of the present invention, in claim 3
The connector 60 is connected to the connector 52 of the external printed board 50.

According to a fifth aspect of the present invention, in the third aspect,
The connector 60 and the connector 52 of the external printed board 50
An intermediate connector 70 for connecting and is provided.

A sixth aspect of the present invention is based on the fourth aspect.
A plurality of electrodes 213-1 and 213-2 to which the lead wires are connected are provided on the side surface of the center hole 211 to configure the connector 60.

[0019]

According to the present invention, first, the shaft 21 of the spindle motor is supported on both ends of the housings 10 and 11 by the screws 40 and 43. As a result, it is possible to prevent the eccentricity of the magnetic disk 20 and the occurrence of off-track due to the spindle shaft 21. Secondly, if this is done, the derivation of the lead wire 220-1 of the coil 220 becomes a problem. Therefore, in the present invention, the spindle shaft 21 has a center hole 21
1 and a connecting hole 212 for connecting the center hole 211 to the side surface
And the screw 43 is further provided with a central hole 430. Thereby, the lead wire of the coil 220 can be led out through the center hole 211, the connection hole 212, and the center hole 430 of the screw 43. Therefore, the motor hub 221 and the shaft 211
The mechanical connection with is smooth, and stable rotation is possible even at high speeds. At the same time, workability is improved and manufacturing is facilitated.

[0020]

【Example】

(A) Description of First Embodiment FIG. 2 is a sectional view of a magnetic disk device according to an embodiment of the present invention.
3 is an enlarged view of the A side of FIG. 2, and FIG. 4 is an enlarged view of the B side of FIG.

As shown in FIG. 2, in a housing space formed by a base 11 having a U-shaped cross section, a spindle motor 22 which rotates on the left side thereof around a shaft 21 whose both ends are supported by the base 11. Is provided.
This spindle motor 22 has four magnetic disks 2
0 is attached.

Further, on the right side of the accommodation space, there is provided a rotary actuator 32 which rotates about a shaft 31 whose both ends are supported by the cover 10 and the base 11.
A spring arm 33 having a magnetic head 30 at its tip is attached to the tip of the rotary actuator 32.

Further, a printed board 50 having various control circuits is provided on the lower surface of the magnetic disk device. The printed board 50 has a connector 5 for external connection.
1 and a connector 52 for connecting to the lead wire of the coil of the spindle motor 22.

The spindle motor 22 will be described with reference to FIG. As shown in FIG. 3, the lower portion of the shaft 21 is screwed to the base 11 with the screw 43, and the upper portion thereof is also screwed to the base 11 with the screw 40. A coil 220 is provided around the shaft 21. A motor hub 221 is provided around the shaft 21 via a pair of bearings 222.

A magnet 223 is provided on the inner surface of the motor hub 221 facing the coil 220. Four magnetic disks 20 are fitted on the outer periphery of the motor hub 221. The four magnetic disks 20 are spaced by a spacing ring 224. Then, the uppermost magnetic disk 20 is pressed and fixed by the pressing ring 225.

This spindle motor 22 has a coil 22
By sending a current to 0, the motor hub 221 rotates about the center of the fixed shaft 21. As a result, the magnetic disk 20 fixed to the motor hub 221 rotates.

Next, the rotary actuator 32 will be described with reference to FIG. As shown in FIG. 4, the lower portion of the shaft 31 is screwed to the base 11 with screws 42, and the upper portion thereof is also screwed to the base 11 with screws 41. A bearing 323 is provided around the shaft 31. The actuator 32 is provided via the bearing 323.

The actuator 32 has five arms 320 formed on the left side of the figure with the shaft 31 as the center. The above-mentioned spring arm 33 is provided on this arm 320. The magnetic head 30 (see FIG. 3) is attached to the tip of the spring arm 33. The magnetic head 30 has an MR (magnetic resistance) as a read head.
The write head has an inductive element.

The actuator 32 has a shaft 31.
Centering on the right side of the figure, a pair of coil support blocks 321
Is provided. This pair of coil support blocks 32
1, a drive coil 322 is provided as shown. The yoke 34 fixed to the base 11 is located on the left and right sides and between the drive coils 322. The magnet 3 is formed on the surface of the yoke 34 facing the drive coils 322 of the left and right blocks.
40 is provided.

Therefore, when an electric current is applied to the drive coil 322, the actuator 32 rotates around the center of the shaft 31 and moves the magnetic head 30 in the radial direction of the magnetic disk 20.

Next, the spindle motor and its peripheral mechanism will be described. FIG. 5 is a sectional view of the spindle motor of FIG.
6 is an explanatory view of the coil of FIG. 5, FIG. 7 is an exploded view of the magnetic disk device of FIG. 2 seen from above, and FIG. 8 is a top view of the completed magnetic disk device of FIG.

As shown in FIGS. 5 and 6 (A), the spindle motor includes a coil 2 on the spindle shaft 21.
20 are provided. As shown in FIG. 6B, nine coils 220 are provided around the shaft 21. Then, the nine coils 220 are connected by four lead wires 220-1.

Further, the spindle shaft 21 is provided with screw holes 210 and 211. And the screw hole 21
1 is connected to the side surface of the shaft 21 by a connection hole 212 provided in the shaft 21. The lead wire 220-1 is inserted into the connecting hole 212 and the screw hole 211.

As shown in FIG. 5, bearings 222 are provided above and below the coil 220 of the spindle shaft 21. Then, a motor hub 221 provided with a magnet 223 on its inner surface is provided around it. Thereby, the spindle motor is completed. This spindle motor is the base 11
It is attached by screws 40 and 43.

The upper screw 40 has a normal structure, but the lower screw 43 has a central hole 430 at the center. Therefore, when the spindle motor is inserted into the base 11 and attached by the screws 40 and 43, the lead wire 22 is inserted into the central hole 430 of the screw 43.
0-1 is inserted and attached.

Therefore, the spindle motor has a base 11
Both ends are screwed, and the lead wire 220-1 of the coil 220 is guided to the outside of the base 11 through the connecting hole 212, the screw hole 211, and the central hole 430 of the screw 43. As a result, both ends of the spindle shaft 21 are firmly supported by the base 11, so that eccentricity and offset of the spindle motor can be prevented. At the same time, the lead wire 22 is not affected without affecting the rotation of the spindle motor.
0-1 can be led to the outside.

As shown in FIG. 7, the lead wire 220-1 led to the outside is connected to the flexible cable 46. In this figure, 10 is a cover, which has a U-shaped cross section. Then, it is fitted into the base 11 to keep the inside airtight.

That is, the above-mentioned spindle motor and rotary actuator 32 are provided on the base 11 with both ends thereof supported. On the other hand, the cover 10 has no components. As shown in FIG. 7, this base 11
Since the dividing line of the enclosure constituted by the cover 10 and the cover 10 is oblique, the open surface of the base 11 can be made large. Thereby, all the components can be easily mounted on the base 11 from the open surface of the base 11. Moreover, the base 11 can also be formed firmly, and the strength of the magnetic disk device can be increased.

FIG. 8 is a top view when the printed board 50 is provided on the above-mentioned magnetic disk device. Printed board 50
Has the external connector 51 at the tip, as described with reference to FIG. The printed board 50 is connected to the magnetic disk device at five points as shown in the figure. The flexible cable 46 of the magnetic disk device is connected to the connector 52 provided on the printed board 50. As a result, the rotation of the spindle motor is controlled by the motor control circuit of the printed board 50.

In this way, the screw 43 has a central hole 430.
By providing the coil 220 of the spindle motor
Since the lead wire 220-1 is guided to the outside through the central hole 430, both ends of the spindle motor can be supported, the lead wire can be easily processed, and the rotation characteristics of the spindle motor can be prevented from being deteriorated.

(B) Description of the Second Embodiment FIG. 9 is an exploded view of the second embodiment of the present invention, and FIG. 10 is a combined configuration diagram of the configuration of FIG. 9 and 10 show only a part of the spindle motor of the magnetic disk device, and the same parts as those shown in FIGS. 2 to 8 are indicated by the same symbols.

As shown in FIG. 9A, a screw groove 421 is formed on the outside of the spindle shaft 21. A screw fixing block 21-1 is provided around the spindle shaft 21. Further, as shown in FIG. 9D, in the center hole 211 of the spindle shaft 21, four separated electrodes 213 are formed on the insulator 213-1.
-2 is provided. Each lead wire 220-1 is electrically connected to the electrode 213-2, and the connector 231
Make up.

As shown in FIG. 9A, the screw 43 is internally threaded and is inserted between the fixed block 21-1 and the shaft 21. This allows the shaft 2
1 is screwed to the base 11. Therefore, when the screw 43 is viewed from above, as shown in FIG.
A center hole 211 is provided at the center of the screw 43, and four electrodes 213-2 are exposed there.

As shown in FIG. 9A, the connector 60
Has a connector pin 62 at one end of a connector base 61. When viewed from above, it becomes as shown in FIG. Further, four electrodes 63 are provided on the other end of the base 61 of the connector 60. Similarly, when this is viewed from below, it becomes as shown in FIG. 9 (B). Further, the printed board 50 is provided with a female connector 52.

By inserting the connector 60 into the central hole 430 of the screw 43, as shown in FIG.
20-1 is electrically connected to the connector pin 62 of the connector 60. When this connector 60 is inserted into the female connector 52 of the printed board 50, the lead wire 220-1 is
It is electrically connected to the printed board 50.

With this arrangement, it is not necessary to connect the lead wire 220-1 to the flexible cable and form the flexible cable as in the first embodiment, which is suitable for automatic assembly. Therefore, the assembly time can be reduced and the assembly cost can be reduced.

(C) Description of Third Embodiment FIG. 11 is an explanatory view of the third embodiment of the present invention.
11A is an exploded view thereof, FIG. 11B and FIG. 11C are partial top views thereof, and FIG. 11D is a combined configuration diagram thereof.
Also in this figure, only a part of the spindle motor of the magnetic disk device is shown, and the same parts as those shown in FIGS. 2 to 10 are shown by the same symbols.

In this figure, the difference from the embodiment of FIGS. 9 and 10 is that the four electrodes 64 of the connector 60 are
This is the point where each lead wire 220-1 is directly connected. Therefore, the lead wire 220-1 is directly electrically connected to the connector pin 62 of the connector 60. This connector 60
Is inserted into the female connector 52 of the printed board 50, the lead wire 220-1 is electrically connected to the printed board 50.

By doing so, it is not necessary to provide the connector 231 on the inner surface of the shaft 21 as in the second embodiment, and the structure is simplified. Therefore, it is more suitable for automatic assembly. Therefore, the assembly time can be reduced and the assembly cost can be reduced.

(D) Description of the Fourth Embodiment FIG. 12 is an explanatory view of the fourth embodiment of the present invention.
12A is an exploded view thereof, FIG. 12B and FIG. 12C are partial top views thereof, and FIG. 12D is a combined configuration diagram thereof.
Also in this figure, only a part of the spindle motor of the magnetic disk device is shown, and the same parts as those shown in FIGS. 2 to 11 are shown by the same symbols.

9 is different from the embodiment of FIGS. 9 and 10 in that each lead wire 220-1 is directly connected to the four electrodes 65 of the connector 60. Further, an intermediate header (connector) 70 is provided. The intermediate header 70 has an electrode 73 connected to the electrode 65 of the connector 60 at one end. Further, the other end has a connector pin 72 connected to the female connector 52 of the printed board 50.

Therefore, as shown in FIG. 12D, the connector 60 is inserted into the central hole 430 of the screw 43 to complete the magnetic disk device. Then, the pin 72 of the intermediate header 70 is inserted into the female connector 52 of the printed board 50. Finally, the intermediate header 7 is attached to the connector 60 of the magnetic disk device.
When the zero electrode 73 is inserted, the lead wire 220-1 is connected to the printed board 50.

Even in this case, it is not necessary to provide the connector 231 on the inner surface of the shaft 21 as in the second embodiment, and the structure is simplified. Therefore, it is more suitable for automatic assembly. Therefore, the assembly time can be reduced and the assembly cost can be reduced.

(E) Description of the fifth embodiment FIG. 13 is an explanatory view of the fifth embodiment of the present invention.
13A is an exploded view thereof, FIG. 13B and FIG. 13C are partial top views thereof, and FIG.
Also in this figure, only a part of the spindle motor of the magnetic disk device is shown, and the same parts as those shown in FIGS. 2 to 12 are shown by the same symbols.

In this figure, the difference from the fourth embodiment of FIG. 12 is that the intermediate header 74 has a plug structure. As a result, the connector 60 has a jack structure having the electrode 66 to which the lead wire 220-1 is connected, on the inner surface. Therefore, the operation is basically the same as that of the fourth embodiment, and the same operation and effect as those of the fourth embodiment are obtained.

(F) Description of the sixth embodiment FIG. 14 is an explanatory view of the sixth embodiment of the present invention.
14A is an exploded view thereof, FIG. 14B and FIG. 14C are partial top views thereof, and FIG. 14D is a combined configuration diagram thereof.
Also in this figure, only a part of the spindle motor of the magnetic disk device is shown, and the same parts as those shown in FIGS. 2 to 13 are shown by the same symbols.

This embodiment differs from the fifth embodiment in that the connector 75 of the printed board 50 has a plug structure and the intermediate header is removed. Therefore,
The structure is simpler and more suitable for automatic assembly.

(G) Description of Other Embodiments In addition to the above embodiments, the present invention can be modified as follows. In the above-described embodiment, the magnetic disk device that accommodates four magnetic disks has been described, but the number of magnetic disks that can be accommodated can be appropriately selected such as eight or ten.

Although the storage disk is described as a magnetic disk, it can be applied to other storage disks such as an optical disk and a magneto-optical disk. Although the present invention has been described with reference to the embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0060]

As described above, according to the present invention,
It has the following effects. Attach the shaft 21 of the spindle motor to the screws 40, 43.
Since both ends are supported by the housings 10 and 11, the eccentricity of the magnetic disk 20 due to the spindle shaft 21 and the occurrence of off-track can be prevented.

In this case, the lead wire 220-1 of the coil 220 is difficult to lead out, but the spindle shaft 21 is provided with the center hole 211 and the connecting hole 212 for connecting the center hole 211 to the side surface. Since the screw 43 has the central hole 430, the lead wire of the coil 220 can be led out through the center hole 211, the connecting hole 212, and the central hole 430 of the screw 43. Therefore, the motor hub 22
The mechanical connection between 1 and the shaft 211 becomes smooth,
Stable rotation is possible even at high speeds. At the same time, workability is improved and manufacturing is facilitated.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a sectional view of a magnetic disk device according to an embodiment.

FIG. 3 is an enlarged view of part A of FIG.

FIG. 4 is an enlarged view of part B in FIG.

5 is a cross-sectional view of the spindle motor of FIG.

FIG. 6 is an explanatory view of the coil of FIG.

FIG. 7 is an exploded top view of the magnetic disk device of FIG.

FIG. 8 is a top view of the magnetic disk device of FIG.

FIG. 9 is an exploded view of a second embodiment of the present invention.

FIG. 10 is a block diagram of a second embodiment of the present invention.

FIG. 11 is an explanatory diagram of the third embodiment of the present invention.

FIG. 12 is an explanatory diagram of the fourth embodiment of the present invention.

FIG. 13 is an explanatory diagram of the fifth embodiment of the present invention.

FIG. 14 is an explanatory diagram of a sixth embodiment of the present invention.

FIG. 15 is an explanatory diagram (1) of a conventional technique.

FIG. 16 is an explanatory diagram of a conventional technique (No. 2).

[Explanation of symbols]

 10 cover 11 base 20 magnetic disk 21 motor shaft 22 spindle motor 30 magnetic head 31 actuator shaft 32 rotary actuator 211 center hole 212 connecting hole 220 coil 220-1 lead wire 221 motor hub 40, 43 screw 430 center hole

Claims (6)

[Claims] 1. A housing (10, which forms an accommodation space therein)
11), at least one storage disk (20) provided in the accommodation space, a center hole (211), and a connection hole (212) connecting the center hole (211) to a side surface, and a coil ( 220)
A spindle shaft (21) that supports the motor, a motor hub (221) that is rotatably provided on the spindle shaft (21) and that supports the storage disk (20), the housing (10, 11), and the spindle shaft. First screw (40) for fixing one end of (21)
And the center hole (21) for fixing the other end of the spindle shaft (21) to the housing (10, 11).
1) and the coil (22) through the connection hole (212).
0) a second screw (43) having a central hole (430) for leading out the lead wire, a head (30) for at least reading information from the storage disk (20), and the head (30). 30) is supported at the tip, and the head (3
0) and an actuator (32) for positioning the track 0) on a desired track of the storage disk (20). 2. The flat cable (46) connected to the lead wire from the center hole (211) of the spindle shaft (21) is provided.
Storage disk device. 3. The storage disk device according to claim 1, wherein a connector (60) to which the lead wire is connected is provided in a center hole (211) of the spindle shaft (21). 4. The storage disk device according to claim 3, wherein said connector (60) is connected to a connector (52) of an external printed board (50). 5. The storage disk device according to claim 3, further comprising an intermediate connector (70) for connecting the connector (60) and the connector (52) of the external printed board (50). 6. A plurality of electrodes (213-1, 21) to which the lead wires are connected, on the side surface of the center hole (211).
The storage disk device according to claim 4, wherein the connector (60) is provided with 3-2).