JP2000076754A - Spindle motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a turntable preventing a media disk from floating at the time of high speed rotation and capable of mounting the disk thereon in the always stable state by providing a means for keeping the media disk to be attracted in the manner of generating the negative lift on the turntable. SOLUTION: The turntable 10 is provided with a media chucking boss 10a at the center part and furnished with plural blowing fins 10b around there. When the media disk is placed on the media placing surface 10c of the turntable 10 constituted in such a manner and rotated at a high speed, the part shown by F of the air existing at the upstream side of the rotational direction of the blowing fins 10b becomes to have the negative pressure since the air is sent to the specific direction by the blowing fins 10b, thereby the media disk is attracted onto the media placing surface 10c. Thus, the media disk does not float even though the vibration and the ununiform wind pressure generated by the spindle motor are exerted on the media disk such as warped, defected, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable for a spindle motor, and more specifically, to prevent a media disk from floating during high-speed rotation by generating a negative lift on the turntable. The present invention relates to a spindle motor provided with means for sucking a disk.

[0002]

2. Description of the Related Art Conventionally, a spindle motor provided with a turntable on which a media disk is mounted has been proposed in which a turntable is fixed to the tip of a rotating shaft or in which the upper surface of a rotor itself constitutes a turntable. Have been.

[0003]

However, in these spindle motors, when the media disk mounted on the turntable is warped or missing, the spindle motor is generated when the media disk is driven at high speed. The media disk floats due to vibration, uneven wind pressure received by the media disk itself, and the like. For this reason, a focus error or a tracking error of a drive pickup is induced, and a skipping read / write error is likely to occur. As a result, the playability of the drive is remarkably reduced. And its reliability and durability may be impaired.

An object of the present invention is to provide a turntable capable of solving the above-mentioned problems and stably mounting a media disk mounted with a simple structure.

[0005]

Means for Solving the Problems To solve the above problems, the media disk is provided with a means for generating a negative lift on the turntable by rotating and sucking the media disk to thereby warp or break the media disk. This allows stable reading without lifting the media disk. That is, according to the first aspect of the present invention, in a spindle motor having a turntable on which a media disk is mounted, a negative lift is generated on the turntable in order to prevent the media disk from floating during high-speed rotation. A means for sucking the disk is provided. According to a second aspect of the present invention, the turntable is integrally formed of a synthetic resin including a boss for a media chuck.

[0006]

FIG. 1 is a sectional view of a main part of a spindle motor according to a first embodiment of the present invention.
FIG. 2 is a plan view of the turntable in FIG. 1. In FIGS. 1 and 2, reference numeral 1 denotes an inverted cup-shaped case constituting a rotor portion of a spindle motor, which is fixed to a rotating shaft 2. 3 is a ring-shaped magnet fixed inside the case 1. Reference numeral 4 denotes a bracket provided to face the case 1. Reference numeral 5 denotes a holder implanted in the center of the bracket, which is provided with a thrust bearing 6 at one end,
Is axially restricted, and the rotating shaft 2 is rotatably supported via a bearing 7 provided at an output end. Reference numeral 8 denotes a yoke implanted in the holder 5, around which a coil 9 is wound. Reference numeral 10 denotes a turntable fixed to the output end of the rotary shaft 2. The turntable 10 has a media chuck boss 10a at the center, and a plurality of blowing fins 10b around the boss 10a. 1 and 2 show an example in which six fins 10b for blowing are provided, but the number of fins 10b for blowing may be appropriately changed as long as the number is two or more. 10c is a medium mounting surface.

[0007] A media disk is mounted on the media mounting surface 10c of the turntable 10 configured as described above.
When the fan is rotated at a high speed, the air upstream of the blower fins 10b in the rotation direction is sent by the blower fins 10b in the direction of arrow A, so that the portion indicated by F becomes a negative pressure, and the media disk indicated by a virtual line is placed on the medium. It can be sucked on the surface 10c.

In this way, even if the warped or missing media disk is subjected to vibration generated by the spindle motor, uneven wind pressure, etc., the media disk is sucked onto the turntable 10. It does not rise because it is attached.

[0009]

As described above, according to the first aspect of the present invention, in a spindle motor having a turntable on which a media disk is mounted, the spindle motor is provided with a turntable for preventing the media disk from floating during high-speed rotation. By providing a means for generating negative lift on the table and sucking the media disk, the warped or missing media disk is mounted on the turntable and driven at high speed to rotate the spindle motor. The media disk does not rise even if the vibrations that occur and the unevenness of the wind pressure that the media disk itself receives are applied, so the drive pickup focus error, tracking error, sound skip, read / write error, etc. The cause of the reduced ability no longer occurs, The load of the bearing of the spindle motor, such as vibration, is reduced, and the reliability and durability of the bearing are not impaired. According to the second aspect of the present invention, since the turntable is integrally formed with the synthetic resin including the boss portion for the media chuck, the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a spindle motor according to a first embodiment of the present invention.

FIG. 2 is a plan view of the turntable in FIG. 1;

[Description of Signs] 1 Case 2 Rotary shaft 3 Ring magnet 4 Bracket 5 Holder 6 Thrust bearing 7 Bearing 8 Yoke 9 Coil 10 Turntable 10a Media chuck boss 10b Blower fin 10c Media mounting surface

Claims (2)

[Claims] In a spindle motor provided with a turntable on which a media disk is mounted, in order to prevent the media disk from floating during high-speed rotation, a negative lift is generated on the turntable to suck the media disk. A spindle motor provided with a means for storing. 2. The spindle motor according to claim 1, wherein the turntable is integrally formed of a synthetic resin including a boss portion for a media chuck.