JP2535937Y2 - Disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a small-sized disk drive device used by loading an information recording disk, and more particularly to an improvement of a spindle motor unit.

[Conventional technology]

2. Description of the Related Art A disk drive in which an information recording disk such as a 3.5-inch floppy disk is loaded is widely used as an external storage device of a personal computer or a word processor, and its miniaturization and cost reduction have been promoted.

FIG. 3 is an explanatory view showing a conventional structure of a spindle motor section of this kind of disk drive device. In FIG. 1, a bush 15 is press-fitted on the upper portion of a spindle shaft 3 rotatably supported on a base 2 via a bearing 1, and an annular plastic magnet 16 is fitted on the outer peripheral surface of the bush 15.
Has been fixed. The bush 15 and the plastic magnet 16 constitute a table on which the information recording disk 18 is mounted.

A polyslider 9 for friction reduction is fixed on the upper surface of this table. A hook 20 is formed on the outer edge of the lower surface of the plastic magnet 16, and one end of the leaf spring 17 is held on the lower surface of the table by the hook 20. A drive pin (not shown) protrudes upward from one end of the leaf spring 17, and the drive pin passes through an opening formed in the plastic magnet 16,
The table is provided so as to protrude from the upper surface of the table. Therefore, when an external force is applied to the drive pin so as to push the tip of the drive pin, the leaf spring 17 bends downward and the drive pin can be pushed down in the opening.

A bowl-shaped rotor 4 is fixed to the outer peripheral surface of the plastic magnet 16, and a rotor magnet 6 is fixed to the outer peripheral portion on the bottom side of the rotor 4 along the circumferential direction. On the other hand, the stator 11 fixed on the peripheral surface of the bearing 1 has
A ring-shaped exciting coil 12 is provided at a position facing the rotor magnet 6, and a current is caused to flow through the exciting coil 12 to generate a torque in the rotor magnet 6 to rotate the rotor 4 to the spindle. It is configured to be driven to rotate integrally with the shaft 3.

A metal hub 7 is attached to the center of an information recording disk 18 such as a 3.5-inch diameter disk, into which a positioning hole (not shown) through which the drive pin is inserted and a spindle shaft 3 are inserted. And a chucking hole 7a to be formed.

In the conventional disk drive device having such a configuration, when the information recording disk 18 pushed into the mounting opening (not shown) reaches a predetermined position, the information recording disk 18 is moved downward in the table direction, and the center of the metal hub 7 is moved. The tip of the spindle shaft 3 is inserted into the chucking hole 7a opened in the above, and the metal hub 7 is chucked by the magnetic attraction of the plastic magnet 16.

Next, when the excitation coil 12 is energized to start the rotation of the rotor 4 and the drive pin reaches the positioning hole and is fitted, the centering of the information recording disk 18 is completed. In this state, the information recording disk 18 is centered on the spindle shaft 3. Recording or reproduction of information is performed while rotating 18.

[Problems to be solved by the invention]

In the above-described conventional disk drive device, the drive pin is pushed downward by the metal hub 7 until the information recording disk 18 completes the positioning, and the leaf spring 17 also bends to approach the exciting coil 12 and the bearing 1. To move down.
For this reason, it is necessary to secure a space for moving the leaf spring 17 below the leaf spring 17, and when the thickness of the apparatus is restricted, the exciting coil 12 and the rotor magnet 6 are not connected to the leaf spring 17.
Must be located more radially outward than
If the diameter of the disk drive device becomes large and it is attempted to make the diameter small, it is difficult to make the disk drive thinner, which has been an obstacle to miniaturization as a whole.

The present invention has been made in view of the current situation of the conventional disk drive device described above, and an object of the present invention is to provide a disk drive device that can perform chucking as before and can be reduced in size and thickness. Is to do.

[Means for solving the problem]

The object is to mount a metal hub at the center of the information recording disk on the upper surface side of the rotor and perform chucking, and to supply a current to an exciting coil to rotate the information recording disk via the rotor, thereby driving the information recording disk. The rotor includes a rotor magnet, and magnetic suction means for chucking the metal hub by magnetic attraction is fixed on the upper surface of the rotor, and at least a part of a drive pin support plate provided with drive pins near the other end. And the drive pin support plate is placed on the upper surface of the rotor 4 and the drive pin is located at a position facing the other end of the drive pin support plate of the rotor. This is achieved by means of forming an opening wider than the width of the support plate.

[Action]

When the drive pin is pushed by the metal hub of the information recording disk until the information recording disk is positioned by the above means, the drive pin support plate also moves down and moves into the opening provided in the rotor.

Therefore, since the drive pin support plate does not take a position protruding greatly from the lower surface of the rotor, the excitation coil and the rotor magnet can be arranged below the drive pin support plate,
A small and thin configuration is realized.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.

FIG. 1 is an explanatory view showing the configuration of a spindle motor section of the disk drive device according to the present invention, and FIG. 2 is an explanatory view of the table as viewed from above, which is the same as FIG. Are denoted by the same reference numerals, and redundant description will be omitted as appropriate.

In these figures, a magnetic attraction means 22 composed of a bush made of a plastic magnet is press-fitted on the upper part of a spindle shaft 3 rotatably supported on a base 2 via a bearing 1. Means 22 for rotor 4
The magnetic attraction means 22 is fixed on the upper surface of the rotor 4 by swaging or bonding. A drive pin support plate 24 composed of an arc-shaped leaf spring whose inner peripheral edge is fitted and held in a gap 23 formed between the rotor 4 and the bush 22 is attached to the rotor 4.
Is mounted on the upper surface of the
10 protrudes upward.

The circumference of the leaf spring 24 placed on the upper surface of the rotor 4 is
23, one end of a leaf spring 24 and a bush 22
As shown in FIG. 2, a torsion coil spring 25 is elastically provided therebetween. One end of the torsion coil spring 25 is engaged with a pin on the table, the other end is engaged with the outer peripheral end of the leaf spring 24, and a part of the drive pin support plate 24 is It is pressed into the gap 23 of the magnetic attraction means 22 and is held on the upper surface of the rotor 4 so as to face the lower surface of the magnetic attraction means 22. Leaf spring of rotor 4
At the other end of the opening 24, an opening 26 serving as a relief is formed. This opening 26 extends along the other end of the leaf spring 24, and
It is formed wider than the leaf spring 24.

As described above, since the leaf spring 24 is placed on the upper surface of the rotor 4, the excitation coil 12 is arranged in the area of the leaf spring 24, that is, below the leaf spring 24, approaching the lower surface of the rotor 4. ,
Accordingly, the rotor magnet 6 is also provided near the leaf spring 24.

In this embodiment, the bush 22 constitutes a magnetic attraction means for chucking the metal hub 7 by magnetic attraction, and constitutes a table on which the information recording disk 18 is mounted.

The configuration of the other parts of the embodiment and the disk driving operation are the same as those of the conventional disk driving device already described with reference to FIG.

In this way, according to the above-described embodiment, it is not necessary to secure a large moving space for the drive pin support plate 24 near the lower surface of the rotor 4. , An exciting coil 12 is provided, and the rotor magnet 6 can be arranged in close proximity to the exciting coil 12. Therefore, the device can be reduced in size and thickness. Also, since a part of the driving pin support plate 24 faces the lower surface of the magnetic attraction means 22, the driving pin
The upward movement of the metal hub 10 is restricted, and can be constantly inserted into the positioning hole of the metal hub 7 in a fixed state, so that stable recording or reproduction can be performed.

[Effect of the invention]

As described above, according to the present invention, the movement of the drive pin and the drive pin support plate is absorbed by the thickness of the rotor by performing the movement at the opening of the rotor. The excitation coil can be disposed below the driving pin support plate, and the thickness and the size can be reduced. Further, since at least a part of the drive pin support plate faces the lower surface of the magnetic attraction means, the upward movement of the drive pin is restricted, so that the drive pin can always be fitted in the metal hub in a constant state, thereby achieving stable recording or reproduction. It can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a configuration of a spindle motor section of the disk drive device according to the present invention, FIG. 2 is an explanatory view of the table viewed from above, and FIG. 3 is a view showing a spindle motor section of a conventional disk drive apparatus. FIG. 3 ... Spindle shaft, 4 ... Rotor, 6 ... Rotor magnet, 7 ... Metal hub, 12 ... Exciting coil, 18 ... Information recording disk.

Claims (1)

(57) [Scope of request for utility model registration] 1. A disk drive device in which a metal hub at the center of an information recording disk is mounted on an upper surface side of a rotor for chucking and energizing an excitation coil to rotate the information recording disk via the rotor. At least one of a drive pin support plate having a rotor magnet, a magnetic attraction means for chucking the metal hub by magnetic attraction on an upper surface of the rotor, and a drive pin provided near the other end; The drive pin support plate is placed on the upper surface of the rotor while facing the lower surface of the magnetic attraction means, and the drive pin is located at a position facing the other end of the drive pin support plate of the rotor. A disk drive device, wherein an opening wider than the width of the support plate is formed.