JPH02199670A - Disk driving device - Google Patents

Abstract

PURPOSE:To miniaturize an entire device, and to reduce its weight, to facilitate an assembling work, and to drive the device with a small driving torque by forming a driving magnet and a disk attracting magnet to a turntable composed of a plastic magnet. CONSTITUTION:A turntable 1 made of a plastic magnet is turned by an electromagnetic system by applying driving magnet magnetization to a position opposite to a coil 2. Moreover, FG magnetization is applied to the position of the turntable 1 opposite to the frequency generator FG pattern 7 of a printed circuit board 6 to obtain an output signal from the FG pattern 7. Then attracting magnet magnetization is applied to the position of the turntable 1 opposite to the metallic hub 11 of a disk 10 to attract the disk 10, which is driven with the turntable 1 in the same speed of revolutions of the turntable 1. Thus, the plastic magnet of the turntable is served as the driving magnet and the disk attracting magnet in such a manner, the device is miniaturized and reduced in weight, the assembling work are facilitated, as well and the torque of the disk is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk drive device in which a disk, which is a recording medium, is fixed to a turntable by a suction magnet and rotated by a motor.

[Prior Art] Figure 2 is a sectional view showing the main components of a conventional disk drive device. In Figure 1, 2 is a coil, 3 is a shaft, 4 is a base, 5 is a bearing, and 6 is a printed circuit board (PCB). ,7
is an Oka wave number generator (FG) that detects rotational speed, 8 is a bush, 9 is a disk center hole, 10 is a disk, 11 is a metal hub, 12 is a turntable, 13 is a drive magnet, 14 is an FG magnet, 15 16 is a magnet yoke, and 16 is an attraction magnet.

As shown in FIG. 2, the conventional turntable 12 is made of metal materials such as aluminum and zinc, and includes suction magnets, magnets 16. Turntable 12. It was constructed such that drive magnets 13 were stacked on top of each other.

[Problems to be Solved by the Invention] The conventional disk drive device as described above has the following drawbacks.

■There are many parts, and the parts cost 9 assembly cost is high.

■It is difficult to make the device thinner because various parts are stacked on top of each other.

■The rotating part is heavy and requires a high-torque motor.

■Since the turntable is metal, the finish of the machining surface will not be uniform unless care is taken to manage the cutting tool as a cutting tool.

This invention was made to solve this problem, and by reducing the number of parts and making the entire device smaller and lighter,
Another object of the present invention is to provide a disk device that is easy to assemble and can be driven with a small rotational torque.

[Means for Solving the Problems] In order to achieve the above object, a disk drive device of the present invention includes a turntable made of a plastic magnet and a drive magnet and a disk attraction magnet formed thereon.

[Function] According to the above structure, the plastic magnet of the turntable serves as both a drive magnet and a disk suction magnet, so the device is small.

It is lightweight and easy to assemble, and the rotational torque of the disk can be small.

[Embodiment] FIG. 1 is a sectional view of an embodiment of a disk drive device according to the present invention, and in the figure, 1 is a turntable made of a plastic magnet material. The turntable 1 is magnetized with a drive magnet at a position facing the coil 2 so as to be rotated electromagnetically, and is integrally molded with a shaft 3 and rotated while being supported by a bearing 5 of a base 4. Furthermore, FG magnetization is applied to the turntable l located at a position facing the FG pattern 7 of the PGE 1, so that the FG pattern 7 obtains an output signal. Then, an attraction magnet is magnetized at a position of the turntable 1 that faces the metal hub 11 of the disk 10, and the disk 10 is attracted and rotates in the same manner as the turntable 1.

In this way, by using plastic magnets as the material of the turntable 1, the degree of freedom in designing the magnetization of the drive magnet, attraction magnet, and FG is increased, the number of parts is reduced, and costs are reduced, and the weight of the rotating part is light, so it starts A drive device with good characteristics can be realized.

Further, FIG. 3 is a sectional view of a disk drive device showing another embodiment of the present invention, and since the same reference numerals as in FIG. 1 indicate the same or corresponding parts, a description thereof will be omitted. When a disk drive device is configured with an ultra-thin and high-torque motor, a drive magnet with high magnetic properties is required. Therefore, if a plastic magnet is not sufficient for the turntable 17 in the device shown in FIG. 1, a magnet 18 with high magnetic properties can be incorporated in the position facing the coil 2, and it can also be used with an ultra-thin, high-torque motor. .

In this configuration as well, by applying attraction magnet magnetization to the turntable 17, which is a plastic magnet, the attraction magnet 16 as shown in the conventional example shown in FIG.
Since there is no need to provide a device, the number of parts is reduced, and the device can be made thinner.

Note that a yoke may be attached to the back side of the magnet 18.

Furthermore, FIG. 4 is a cross-sectional view showing another embodiment of the present invention, and since the same reference numerals as in FIGS. 1 to 3 indicate the same or corresponding parts, a description thereof will be omitted. The device shown in Figure 4 takes advantage of the good moldability of plastic magnets.
By making the bearing structure sink into the turntable 19, it is possible to achieve a thinner structure. In addition, in order to increase the magnetic flux density, a yoke 2 is installed on the outer periphery of the turntable 19.
By integrally molding 0, it is possible to prevent the influence of magnetic flux on equipment surrounding the motor.

[Effects of the Invention] As explained above, the disk drive device of the present invention uses a plastic magnet in the turntable and can serve as drive magnet magnetization, attraction magnet magnetization, FG magnetization, etc.; Fewer parts, reduced assembly costs, ■Thinner profile, ■Lighter rotating parts, resulting in a drive device with excellent starting characteristics, and ■No wear on the cutting tool, improving assembly processing characteristics such as processing conditions. etc. become possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of a disk drive device according to the present invention, FIG. 2 is a cross-sectional view showing the main structure of a conventional disk drive device, and FIG. 3 is a disk drive showing another embodiment of the present invention. A cross-sectional view of the device, FIG. 4 is a cross-sectional view showing another embodiment of the present invention. In the figure. 1 Niblast Magnetic Turntable 2: Coil 3: Shaft 4: Base 5: Bearing 6: PCB 7: FG Pattern 8: Push 9" Disc Center Hole 10: Disc 11: Metal Hub

Claims (1)

[Claims] 1. A disk drive device for driving a recording medium on a disk, characterized in that the drive magnet and the disk suction magnet are formed on a turntable made of a plastic magnet.