JP3316888B2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive.

[0002]

2. Description of the Related Art Conventionally, a lower carriage 4 mounted with a lower head 3 for recording and reproducing data on and from a magnetic disk 2 housed in a jacket 1 as shown in FIG. An upper carriage 6 on which an upper head 5 for recording and reproduction is mounted on the opposite surface, and a suspension 7 in which the lower carriage 4 and the upper carriage 6 are constituted by leaf springs so that the upper carriage 6 can rotate with respect to the lower carriage 4. Connected by The magnetic disk 2 has a metal media hub 8 adhered to the center thereof, and a spindle motor 9 for rotating the magnetic disk 2 is fixed to a frame 12. The chucking mechanism 10 is provided to position the media hub 8 by suction and transmit the rotational force. A thrust bearing of the spindle 13 is constituted by the receiving member 15 provided at the opposite end of the chucking mechanism 10 provided at one end of the spindle 13 and the ball 14, and the spindle 13 is positioned in the axial direction. The guide shaft 11 of the lower carriage 4 is fixed to the frame 12, and the lower carriage 4 is guided by the guide shaft 11 and is configured to be movable in the radial direction of the magnetic disk 2.

[0003]

In the above-mentioned prior art,
Spindle 1 of spindle motor 9 fixed to frame 12
When the media hub 8 is sucked and positioned by the chucking mechanism 10 provided at one end of the magnetic disk 3, the height (vertical direction in the figure) of the magnetic disk 2 adhered to the hub is inevitably determined. On the other hand, since the lower head 3 is mounted on the lower carriage 4, the height is also determined by the frame 12 to which the guide shaft 11 that guides the lower carriage 4 is attached. When the height of the lower head 3 and the height of the magnetic disk 2 deviate from the specified values, the lower head 3, the upper head 5
It is a well-known fact that the contact between the disk and the magnetic disk 2 becomes unstable and the reliability of signal recording / reproducing is impaired, and is the most important item in designing a disk drive. Therefore, in the conventional disk device, the frame 12 is formed by die-casting or the like and finished with high precision by cutting, or the dimensional accuracy from the mounting surface of the motor 9 to the receiving surface of the chucking mechanism 10 is required. 4. The requirement for dimensional accuracy of the lower head 3 was severe, leading to an increase in the cost of parts. However, even then, the height relationship between the head and the magnetic disk cannot be made sufficiently, which has been a problem for improving the reliability of the magnetic disk device.

[0004]

In order to solve the above-mentioned problems, a disk drive according to the present invention comprises a spindle engaged with a center hole of a metal hub fixed to the center of a disk;
A disk device, comprising: a rotating plate fixed to the spindle and having a receiving surface portion forming a receiving surface on which the hub is placed during recording and reproduction, and a suction magnet for attracting the hub to the receiving surface side. The receiving surface portion is formed integrally with the attraction magnet, the attraction magnet has the receiving surface portion, and a suction portion magnetized except for the receiving surface portion, and the attraction portion is configured such that the hub is It is configured to be lower than the receiving surface portion so as to have a gap between the hub and the hub when placed on the receiving surface portion.

[0005]

As described above, the receiving surface constituting the receiving surface of the hub is formed integrally with the suction magnet for attracting the hub to the receiving surface, and the suction portion of the suction magnet is mounted on the receiving surface. In order to reduce the number of parts of the disk drive and reduce the cost of the disk drive, and to improve the reliability of the disk drive by configuring the lower part so that there is a gap between the hub and the hub You can.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is a sectional view of a spindle motor according to the present invention. In FIG. 1, a jacket 160 accommodating the disk 101 is set on a motor at a recording / reproducing position. In the center of the motor board 100, a housing 102,
A stator 103 around which a coil 108 is wound is fixed to a frame 150 by three screws 104. A metal bearing 105 is press-fitted into the housing 102.
In this embodiment, the housing 102 is formed of plastic, so that the press-fitting of the bearing 105 can be easily performed, and the adverse effects (deformation and damage) caused by press-fitting the bearing 105 can be minimized. It is. Further, the media hub 10 is bonded and fixed to the center of the disk 101 in the jacket 160 described above.
The spindle 107, which engages and guides the center hole of No. 6, has both end faces processed into an R shape. R at the top of the drawing is a guide for setting the media hub 106, and R at the bottom is
The part is a thrust bearing 13 provided on the motor board 100.
The bearing is configured by sliding with 0. These R portions are finished with a high degree of surface roughness. Rotor 11 with drive magnet 110 for spindle motor
1 (rotating plate) is made of a magnetic material, and the spindle 1
7 is connected to a diaphragm raising portion 111a provided at the center of the rotor 111 toward the upper surface in FIG.
7 is press-fitted and fastened. Thus, the rotor 111
, The bearing 105 of the spindle 107 can have a longer length.
Shaft runout can be reduced. Rotor 111
A suction magnet 120 for sucking the media hub 106 is mounted on the upper surface of the device. This suction magnet 1
Reference numeral 20 denotes a plastic magnet molded from a nylon-based resin, the center of which is raised to form a receiving surface as a receiving surface of the media hub 106. Further, a suction portion is provided on the outer peripheral portion with a step lower by one step, and the suction portion is magnetized for attracting the media hub 106 to the receiving surface side. Therefore, as shown in FIG. 1, when the media hub 106 is attracted to the receiving surface side by the attraction magnet 120 and is placed on the receiving surface portion, a step difference between the receiving portion and the media hub 106 occurs between the suction portion and the media hub 106. Is formed. The rotor 111 and the spindle 1 on the side of the attraction magnet 120
By providing the squeezing-up portion 111a for the fastening of 07, the space for the fastening can be effectively used.
Further, these spindle motors are mounted on a frame 150. Similarly, a guide shaft (not shown) is attached to the frame 150, and a head 140 is mounted on a carriage 141 guided by the guide shaft.

Next, the thrust bearing 130 is shown in FIGS. FIG. 2 is a perspective view of the thrust bearing 130 as viewed from above. FIG. 3 is a perspective view from below of the thrust bearing 130. In FIG. 2, the thrust bearing 130 is mounted in a hole provided in the motor board 100. The hole has three protruding portions 100a around it, and three cam portions 1 provided on the outer periphery of the protruding portion 100a and the thrust bearing 130.
30a abuts to determine the position in the thrust direction. As shown in FIGS. 2 and 3, since the cam portion 130 a has a step, when the thrust bearing 130 is rotated in the direction of the arrow 131 in the drawing, the protrusion 100 a of the motor substrate 100 and the cam portion 130 a of the thrust bearing 130 are brought into contact with each other. The contact point changes, and the thrust bearing 130 moves in the thrust direction (the direction of the arrow 132 in the figure). Thus, the spindle 107 shown in FIG. 1 moves in the thrust direction (the direction of the arrow 133 in the figure), and the height of the disk 101 and the height of the lower head 140 can be changed and adjusted stepwise. Further, the cam portion 130a may be configured to change continuously instead of stepwise. In that case, the height of the lower head 140 and the disk 101 can be adjusted with higher accuracy. Further, the thrust bearing 130 is provided on the bottom surface of the spindle motor, and has a structure in which the thrust bearing 130 can be adjusted from the back surface of the disk device. Therefore, the height of the disk 101 can be adjusted after assembling the disk device, and the adjustment can be easily performed. As shown in FIG. 3, the thrust bearing 130
A groove 135 for adjusting the rotation is provided on the bottom surface of the device, and in this embodiment, the groove 135 can be adjusted with a flathead screwdriver.

In this way, the height of the disk 101 is adjusted,
By properly adjusting the relationship between the height of the lower head 140 and the height of the lower head 140, the contact between the disk 101 and the head is kept good, and the reliability of recording and reproduction can be improved. In addition, even if the dimensions of each part vary, the height of the disk 101 can be finally adjusted by adjustment, so that it is not necessary to require much precision of the parts, and therefore, the cost of the parts can be reduced. Thus, the disk device can be configured by a set of inexpensive parts, and the cost of the disk device can be reduced. Further, even if the thrust direction of the spindle 107 is adjusted, the spindle 10
Since the media hub 7 is guided by the high-accuracy bearing 105, the media hub 106 moves horizontally without tilting, and the height adjustment accuracy can be increased. Furthermore, by configuring the thrust bearing 130 so that it can be adjusted from the back surface of the disk device, adjustment can be performed during and after assembling the disk device, and the degree of freedom of adjustment can be increased.

[0009]

The present invention comprises a spindle engaged with a center hole of a metal hub fixed to the center of a disk, and a receiving surface fixed to the spindle and for mounting the hub during recording and reproduction. Disk device having a receiving surface portion to be rotated and a suction magnet for attracting the hub to the receiving surface side, the receiving surface portion is integrally formed with the suction magnet, and the suction magnet includes the receiving surface portion and the receiving surface portion. The suction device is configured to be lower than the receiving surface so that the hub has a gap between the hub and the receiving surface when the hub is placed on the receiving surface. In addition to reducing the number of components, the cost of the disk device can be reduced, and the reliability of the disk device can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a spindle motor according to the present invention.

FIG. 2 is a top perspective view of a thrust bearing according to the present invention.

FIG. 3 is a bottom perspective view of a thrust bearing according to the present invention.

FIG. 4 is a schematic sectional view of a conventional disk device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Motor board 100 a Projecting part 107 Spindle 130 Thrust bearing 130 a Cam part

Claims (2)

(57) [Claims] 1. A spindle which is engaged with a center hole of a metal hub fixed to a center portion of a disk, and a receiver which is fixed to the spindle and constitutes a receiving surface on which the hub is mounted during recording and reproduction. A rotating plate having a surface portion and a suction magnet for attracting the hub toward the receiving surface side, wherein the receiving surface portion is integrally formed with the suction magnet; And a suction unit that is magnetized except for the receiving surface portion, wherein the suction portion has a gap between the hub and the hub when the hub is placed on the receiving surface portion. A disk device characterized by being lower than a surface portion. 2. The disk device according to claim 1, wherein the attraction magnet is formed of a plastic magnet. ◆