JP2003346404A - Disk table and spindle motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an increase in the size of a disk table by lowering the height of a centering member. <P>SOLUTION: The disk table 1 is provided with a disk table main body part 2 for supporting a disk 201, and a centering member 3 disposed on the center of the main body part 2, and the centering of the disk 201 is carried out by an inclined disk insertion guide surface 4 disposed in the centering member 3. The centering member 3 is provided with a magnetic holder 31, and a ring- shaped part 32 fitted to the outer peripheral part of the magnet holder 31 to be elevated. The disk insertion guide surface 4 is disposed only in the ring- shaped part 32. <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 a centering member which is provided with a centering member. The present invention relates to a disk table in which a member is fitted into the center hole while being pressed down to center the disk, and a spindle motor having the disk table.

[0002]

2. Description of the Related Art FIG. 5 shows a known disk table provided with a centering member. The disk table 101 includes a disk table main body 102 supporting a disk 201, and a centering member 103 provided at the center of the disk table main body 102.
And

[0003] The centering of the disk 201 is performed by an inclined disk insertion guide surface 104 provided on the centering member 103.

The centering member 103 includes a magnet holder 106 provided with a magnet 105 for disk chucking, and a ring-shaped portion 107 fitted to the outer periphery of the magnet holder 106 so as to be able to move up and down.

The disk insertion guide surface 104 includes a first disk insertion guide surface 104a provided on the magnet holder 106 and a second disk insertion guide surface 104b provided on the ring-shaped portion 107. Have been.

The ring-shaped portion 107 is urged by a coil spring 108, and its upper end is pressed against the lower surface of the first disk insertion guide surface 104a of the magnet holder 106. The disk table 101
Is attached to a spindle shaft 52 of a spindle motor 51.

When the disk chatting is performed, the center of the disk table main body 102 is moved with respect to the disk 20.
When the disk 1 descends in an eccentric state, the peripheral portion of the center hole 202 of the disk 201 first contacts the first disk insertion guide surface 104a, and then contacts the second disk insertion guide surface 104b. Shape 1
07 is fitted into the center hole 202 while being pushed down to the disk table main body 102 side against the urging force of the coil spring 108 to perform centering of the disk 201.

[0008]

In the conventional disk table 101, the disk insertion guide surface 104 has a first disk insertion guide surface 104a provided on the magnet holder 106 and the ring-shaped portion 107. Second disk insertion guide surface 104 provided on
b, there is a problem as described below. (1) The first disk insertion guide surface 1 provided on the magnet holder 106 is provided on the upper end of the second disk insertion guide surface 104b provided on the ring-shaped portion 107.
04a extend continuously, the centering member 10
The height H of No. 3 increases. (2) Since a step, a gap 104c, and the like are generated at a boundary between the first disk insertion guide surface 104a and the second disk insertion guide surface 104b, smooth guiding of the disk 201 is hindered.

The present invention solves the problems of the conventional disk table, allows the height of the centering member to be lower than that of the conventional disk table, and moves the disk along the disk insertion guide surface. The object of the present invention is to provide a disk table that can be moved smoothly.

[0010]

According to the present invention, there is provided a disk table main body for supporting a disk, and a centering member provided at a central portion of the disk table main body, and an inclination provided on the centering member. In a disk table for centering the disk on a disk-shaped disk insertion guide surface, the centering member is
A magnet holder, and a ring-shaped portion fitted up and down on the outer peripheral portion of the magnet holder,
By providing the disk insertion guide surface only on the ring-shaped portion, the disk insertion guide surface on the magnet holder side of the conventional disk table is eliminated, and accordingly,
The height of the centering member and the disc table can be reduced, and the disc can be moved smoothly along the disc insertion guide surface by preventing steps or gaps from being formed in the middle of the disc insertion guide surface. I was able to make it.

[0011]

Next, an embodiment of the present invention will be described. FIG. 1 is an exploded sectional view of the disk table 1, and FIGS.
FIG. 4 is a sectional view showing a chucking process of the disk 201.

The disk table 1 includes a disk table main body 2 for supporting a disk 201, and a centering member 3 provided at the center of the disk table main body 2.
And an inclined disk insertion guide surface 4 provided on the centering member 3.
1 is performed.

The centering member 3 comprises a magnet holder 31 and a ring-shaped portion 32 fitted to the outer periphery of the magnet holder 31 so as to be able to move up and down.

The disk insertion guide surface 4 is provided on the ring-shaped portion 32. The upper end of the disk insertion guide surface 4 extends to the inner peripheral surface 32a of the ring-shaped portion 32, and the lower end of the disk insertion guide surface 4 extends to a position protruding from the outer peripheral surface 32b of the ring-shaped portion 32. . The disk insertion guide surface 4 is formed in a generally frustoconical shape with a gentle inclination.

The disk table body 2 is formed of a plastic and has a cylindrical shape with a bottom. The disk table body 2 has a spindle bearing hole 22 at the center of a bottom plate 21 and a flange 23 at the periphery of the opening. The disk 201 is supported on the flange portion 23.

The magnet holder 31 is formed of plastic and has a cylindrical shape with a bottom. The magnet holder 31 has a spindle bearing hole 34 at the center of the bottom plate 33, and the upper surface of the bottom plate 33 has the spindle bearing hole 34 as a center. And a ring-shaped magnet fitting recess 35.

In the magnet fitting recess 35, a yoke iron core 36 and a suction (adsorption) magnet 37 for disk chucking are accommodated.

The ring-shaped portion 32 is formed of plastic in a substantially cylindrical shape, and is slidably fitted on the outer peripheral surface of the magnet holder 31.

The ring-shaped portion 32 is engaged with a stopper projection 38 provided on the outer peripheral surface 31a of the magnet holder 31 to prevent the ring-shaped portion 32 from falling off the magnet holder 31 and to prevent the ring-shaped portion from being fixed to the magnet holder 31. A stopper projection 39 that defines the highest position of the projection 32 is provided on the inner peripheral surface 32a.

The ring-shaped part 32 is provided with a coil spring 40 interposed between the disk-shaped part 32 and the disk table body 2.
Thus, the stopper projections 38 and 39 are urged to a position where they engage with each other.

The minimum diameter portion at the upper end of the disk insertion guide surface 4 having a substantially truncated cone shape is formed to have a diameter smaller than the inner diameter of the center hole 202 of the disk 201. The maximum diameter portion at the lower end is formed to have a larger diameter than the inner diameter of the center hole 202 of the disk 201.

As shown in FIG. 2, the upper end of the disk insertion guide surface 4 protrudes from the upper end of the magnet holder 31, and is pressed by the disk 201 when the disk 201 is chucked. As shown in the figure, the magnet holder 31 can be pushed down to the height of the upper end.

The disk table 1 is used by being attached to the tip of a spindle shaft 52 of a spindle motor 51.

Next, the operation of the disk table 1 will be described.

From the state shown in FIG.
As shown in FIG. 3, the disk insertion guide surface 4 of the ring-shaped portion 32 comes into contact with the peripheral edge of the lower end of the center hole 202 of the disk 201, thereby centering the disk 201. As shown in FIG. 4, the hub 203 for chucking the disk 201 is attracted by the suction magnet 37 for chucking the disk 201 and the disk 201 is chucked.
Is performed.

Since the attraction force of the chucking hub 203 by the disk chucking suction magnet 37 is set to be larger than the urging force of the coil spring 40, the disk chucking attraction force is increased. When the chucking hub 203 is attracted by the attraction magnet 37, the ring-shaped portion 32 is pushed down to a position substantially equal to the height of the magnet holder 31 against the urging force of the coil spring 40, and The disc 201 is placed on the flange portion 23, and the chucking hub 203 is attracted by the attracting magnet 37, so that the disc 201
It is in a state of being chucked above. By the way,
In the embodiment, the attraction force of the attraction magnet 37 is set to 80 gf, and the urging force of the coil spring 40 is set to 34 gf.
gf−34 gf = 46 gf), the disk 201 is sucked toward the disk table 1.

In the above embodiment, the case where the chucking hub 203 is attached to the disk 201 has been described. However, the disk 201 and the chucking hub 203 are separated, and the chucking hub 203 is used. The disk 201 may be configured to be clamped on the disk chucking table 3.

[0028]

The disk table and the spindle motor according to the present invention have the following effects. (1) A disk insertion guide surface is provided only on the ring-shaped portion of the magnet holder forming the centering member and the ring-shaped portion. Accordingly, the height of the disk table can be reduced and the disk table can be made thin. In addition, it is possible to secure a large stroke amount of the disk. (2) The disk insertion guide surface is provided only on the ring-shaped portion,
Since the magnet holder does not have a disk insertion guide surface, the disk insertion guide surface of the ring-shaped portion and the disk insertion guide of the magnet holder are the same as when a disk insertion guide surface is provided on both the conventional magnet holder and the ring-shaped portion. There is no step or gap at the boundary with the surface, so that the disk is smoothly guided on the disk insertion guide surface. Further, since the disc insertion guide surface is formed as an integrated surface, processing is easy and the chucking effect can be improved. (3) When grinding the disk receiving surface of the disk table main body, it is easy to prevent intrusion of dust and the like such as grinding dust.

[Brief description of the drawings]

FIG. 1 is an exploded sectional view of a disk table.

FIG. 2 is a cross-sectional view illustrating a chucking step.

FIG. 3 is a sectional view illustrating a chucking step.

FIG. 4 is a sectional view illustrating a chucking step.

FIG. 5 is a sectional view of a conventional disk table.

[Explanation of symbols]

1. Disk table 2: Disk table body
3 ... Centering member, 4 ... Disc insertion guide surface, 3
DESCRIPTION OF SYMBOLS 1 ... Magnet holder, 32 ... Ring-shaped part, 51 ... Spindle motor, 52 ... Spindle shaft, 201 ... Disk, 202 ... Center hole, 203 ... Chucking hub.

Claims (4)

[Claims] 1. A disk table main body for supporting a disk-shaped recording medium, and a centering member provided at a central portion of the disk table main body, wherein an inclined disk insertion guide provided on the centering member. A disk table for centering the disk-shaped recording medium on a surface thereof, wherein the centering member comprises a magnet holder and a ring-shaped portion fitted to an outer peripheral portion of the magnet holder so as to be able to move up and down; A disk table, wherein a surface is provided on the ring-shaped portion. 2. An upper end portion of the disk insertion guide surface,
The disk table according to claim 1, wherein the disk table extends to an inner peripheral position of the ring-shaped portion. 3. An upper end of the disk insertion guide surface,
3. The magnetic recording medium according to claim 2, wherein the magnetic recording medium protrudes from an upper end of the magnet holder, and is pressed down by the disk-shaped recording medium when the disk-shaped recording medium is chucked to a position of an upper end of the magnet holder. Disk table. 4. A spindle motor provided with the disk table according to claim 1 on a spindle shaft.