JPH0527847U - Disk drive - Google Patents

Abstract

(57) [Abstract] [Purpose] Cost reduction, disk drive device thinning, and disk wobbling prevention while preventing slipping of the disk mounted on the hub base when the rotation of the disk drive motor rises and stops. A disk drive device capable of achieving the above is provided. [Construction] A hub base 6 fixed to a rotary shaft 1 of a disc drive motor and on which a disc is mounted is provided, and a chucking surface 7 of the hub base 6 that comes into contact with the disc is provided with a chucking face 7 and a disc. Was coated with an anti-slip agent 10 that enhances the frictional force of the. Not only can the disc be prevented from slipping, but the chucking surface 7 of various shapes can be easily coated, and the coating can be performed with a thin and uniform thickness. It is possible to eliminate the shake of the disc at the time.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a disk drive device, and more particularly to a disk slip prevention mechanism.

[0002]

[Prior Art]

 In an optical disk drive, etc., a disk is placed on a hub base that is driven to rotate by a disk drive motor, and the disk is pressed against the chucking surface of the hub base by the attractive force of a chucking magnet provided in the hub base. As a result, the disk is driven to rotate. An example of this type of disk drive is described in Japanese Utility Model Laid-Open No. 63-24739.

On the other hand, in the disk drive device, in order to shorten the rise time and the stop time of the rotation speed, there is a tendency to allow the disk drive motor to suddenly rise or stop suddenly. However, according to the disk drive device in which the disk is pressed against the chucking surface of the hub base only by the attraction force of the chucking magnet as described above, if the motor starts up or stops suddenly, On the other hand, the disc may slip.

Therefore, as described in Japanese Utility Model Laid-Open No. 64-28550, a viscoelastic body having a plurality of recesses, protrusions or radial grooves is provided on the chucking surface of the hub base. It is considered to increase the frictional force of the chucking surface.

[0005]

[Problems to be solved by the device]

 However, if the viscoelastic body is arranged on the chucking surface of the hub base as described in the above publication, it is necessary to make the viscoelastic body in conformity with various shapes of the chucking surface, resulting in cost reduction. In addition, the viscoelastic body requires a certain amount of thickness, which hinders the thinning of the disk drive device and causes the elastic body to expand and contract in the thickness direction. However, there was a problem that the discs wobbled easily.

The present invention has been made in order to solve such a problem, and it is possible to prevent the slippage of the disk mounted on the hub base at the time of the start and stop of the rotation of the disk drive motor, and at the same time, to reduce the cost. It is an object of the present invention to provide a disk drive device that can reduce the cost, make the disk drive device thinner, and prevent the disk from wobbling.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a disk drive device having a hub base fixedly mounted on the rotary shaft of a disk drive motor and on which a disk is mounted. It is characterized by being coated with an anti-slip agent that enhances the frictional force between the surface and the disc.

[0008]

[Action]

 Even if the rotation of the hub base suddenly rises or stops suddenly, the anti-slip agent on the chucking surface of the hub base prevents the disc from sliding on the hub base. The anti-slip agent can be formed according to various shapes of the hub base by coating means such as coating and spraying, or can be formed thin and of a constant thickness.

[0009]

【Example】

 An embodiment of a disk drive device according to the present invention will be described below with reference to the drawings. In FIG. 1, a bearing holder indicated by reference numeral 11 has a cylindrical portion at the center, and a stator core 3 is fitted and fixed to the outer peripheral side of this cylindrical portion. The stator core 3 is formed by laminating a plurality of core bodies, has a plurality of salient poles in a radial shape, and a coil is wound around each salient pole. Outer rings of ball bearings 2 and 2 are fitted and fixed vertically on the inner peripheral side of the cylindrical portion of the bearing holder 11, and a shaft 1 is fitted and fixed to the inner rings of the ball bearings 2 and 2. A central hole portion of a cup-shaped rotor case 4 is fixed to a lower end portion of the shaft 1 protruding from a lower end of a cylindrical portion of the bearing holder 11 via an appropriate boss or the like. A drive magnet 5 is attached to the inner peripheral surface of the peripheral wall of the rotor case 4. The outer peripheral surface of the stator core 3 is opposed to the inner peripheral surface of the driving magnet 5 with an appropriate gap. In this way, the disk drive motor is constructed.

A cup-shaped hub base 6 for mounting a disk is fitted and fixed to the upper end of the shaft 1 protruding from the upper end of the cylindrical portion of the bearing holder 11. A chucking magnet 8 for attracting a disk and bringing it into pressure contact with the chucking surface 7 of the hub base 6 is attached to the bottom portion of the hub base 6 around the fitting portion with the shaft 1 via the yoke plate 9. is there.

The end surface of the outer peripheral wall of the hub base 6 is the chucking surface 7, and a disk is placed on the chucking surface 7. However, when the motor is suddenly started or stopped, a disk is generated. In order to prevent slipping, the chucking surface 7 is coated with an anti-slip agent 10 to increase the frictional resistance between the chucking surface 7 and the disc. As the anti-slip agent 10, for example, a two-component polyurethane coating agent or a liquid silicone rubber coating agent is used, and this is applied to the chucking surface 7. Alternatively, a non-slip agent made of urethane rubber powder or the like connected with an adhesive may be sprayed onto the chucking surface 7.

Since these anti-slip agents are liquid or powder when applied, the chucking surface 7 of various shapes can be easily coated. Further, since the anti-slip agent 10 is formed by coating, the thickness can be made thin, the entire disk drive device can be made thin, and it is caused when the viscoelastic body is pasted as in the conventional case. It is possible to eliminate the wobbling of the disk when the motor is rotating.

[0013]

[Effect of the device]

 According to the present invention, since the chucking surface of the hub base on which the disc is placed is coated with the anti-slip member that enhances the frictional force between the chucking face and the disc, the disc when the motor suddenly rises or suddenly stops. Not only can it prevent slippage, but it can also easily coat chucking surfaces of various shapes. Further, since it is possible to apply a thin and uniform thickness, it is possible to reduce the thickness of the disk drive device, and it is possible to eliminate the vibration of the disk during rotation.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a disk drive device according to the present invention.

[Explanation of symbols]

 1 rotating shaft 6 hub stand 7 chucking surface 10 anti-slip agent

Claims (1)

[Scope of utility model registration request] 1. A disk drive device having a hub base fixed to a rotary shaft of a disk drive motor and on which a disk is mounted, wherein a chucking surface of the hub base that comes into contact with the disk is a chucking surface. A disk drive device, which is coated with an anti-slip agent that enhances frictional force with the disk.