JPH02270160A - Disk driving device - Google Patents

Abstract

PURPOSE:To make the centering of a disk medium accurate by performing a guide operation between a tapered part of a turntable and a hub and also a tapered part of a tip part of a shaft and a center hole respectively. CONSTITUTION:The tapered part 2c is formed on a side wall part of a recessed part 2a on the upper surface of the turntable 2', and the hub 6 consisting of a ferromagnetic body or the like is mounted in the center of the disk 5, whereas the diameter of the hub 6 is settled slightly smaller than the inner diameter of the recessed part 2a of the turntable 2'. Consequently, under the completion state of accurate chucking, the hub 6 on the lower side of the disk is fallen into the recessed part 2a of the turntable 2', and the tip of the shaft 1 is inserted into the center hole 6a in the center of the hub 6. By this method, since the disk centering is guided by both tapered parts of the shaft 1 and the turntable 2', the disk securely is centered and then chucked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a disk drive device, particularly a disk drive device that drives a disk medium using a turntable having a recess that fits into a hub of the disk medium and a shaft that engages with a center hole of the hub. The present invention relates to a disk drive device that performs centering and chucking and rotationally drives a disk medium.

[Prior Art] FIG. 3 shows the structure of a turntable portion of a conventional magnetic disk drive.

In FIG. 3, reference numeral 1 denotes a shaft, which is coupled to a drive shaft of a spindle motor (not shown).

A turntable 2 is connected to the shaft 1. The turntable 2 has a concave shape and holds a disc (not shown) at its peripheral edge. A ring-shaped suction magnet 4 for disc suction is placed in the recess 2a on the top surface of the turntable 2, and is attached to the yoke 3.
are connected via.

A hub of a disk (not shown) is fitted into the recess 2a on the top surface of the turntable 2 during chucking. The hub is attracted by the attraction magnet 4, thereby chucking the disk.

Further, during chucking, the tip of the shaft 1 is inserted into the center hole of the hub of the disk, thereby centering the disk. Shaft 1
As shown in the figure, a tapered portion 1a is formed at the tip.

[Problems to be Solved by the Invention] In the conventional structure as described above, centering during disk clamping is performed only by the guiding action of the tapered portion at the tip of the shaft. For this reason, if there is a large axis deviation of the disk during clamping, this has been a cause of chucking failure. If chucking failure occurs,
Since the disk is no longer held in the correct position within the drive mechanism, not only will normal recording and reproduction not be possible, but there is a risk of damage to the disk and drive mechanism due to forced driving.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a disk drive device that can reliably center the disk even if there is some axial deviation of the disk and can also chuck the disk.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a turntable having a recess that fits into the hub of the disk medium and a shaft that engages with the center hole of the hub. In a disk drive device that centers and chucks the disk medium and rotates the disk medium,
A tapered portion is formed in the recess of the turntable and the tip of the shaft, and when chucking the disk medium, the tapered portion of the turntable and the tip of the shaft guides the hub and center hole to promote centering of the disk medium. The configuration was adopted.

[Function] According to the above configuration, the disk medium can be accurately centered by the guiding action between the tapered portion of the turntable and the hub, and between the tapered portion of the shaft tip and the center hole.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 shows the structure of the turntable portion of a disk drive device employing the present invention. Here, the same members as in the conventional example are given the same reference numerals.

The structure of FIG. 1 differs from that of FIG. 3 in the structure of the turntable 2', and the other structures are the same as the conventional example shown in FIG.

That is, in this embodiment, a tapered portion 2C is formed on the side wall portion of the recessed portion 2a on the upper surface of the turntable 2'.

FIG. 2 shows the disk chucking operation by the mechanism shown in FIG.

5. As shown in Figure 2. A hub 6 made of ferromagnetic material is attached to the center of the disk (magnetic disk, optical disk, etc.) 5, and the diameter of the hub 6 is set to be slightly smaller than the inner diameter of the recess 2a of the turntable 2'. There is.

Therefore, when the correct chucking is completed as shown in FIG. 2, the lower hub 6 of the disk has fallen into the recess 2a of the turntable 2' as shown. Also at this time,
The tip of the shaft 1 is located in the center hole 6a of the hub 6.
inserted inside.

When clamping the disk in the above configuration, the disk is first fed into an appropriate position on the turntable 2' by a loading mechanism (not shown) or by manual operation, and then the shaft 1 is driven to rotate.

At this time, the center hole 6a of the hub 6 is guided by the tapered part 1a of the shaft 1, and the hub 6 is guided by the tapered part 2C of the turntable 2', and the centering of the disc is completed, as shown in FIG. A chucking condition is formed.

As described above, in the first embodiment, since the disk centering is guided by both the shaft 1 and the tapered portions 1a and 2c of the turntable 2', the disk can be reliably centered and chucked. Particularly in the initial stage of centering, since guidance is performed by the hub 6 and the taper portion 2C of the turntable 2' having a large diameter, centering and chucking can be performed accurately and reliably.

The above configuration includes optical disk devices, magnetic disk devices, etc.
The turntable has a recess that fits into the hub of the disk medium, and the shaft engages with the center hole of the hub, making it applicable to various disk drive devices that center and chuck the disk medium.

[Effects of the Invention] As is clear from the above, according to the present invention, a disk medium can be centered and chucked by a turntable having a recess that fits into a hub of the disk medium, and a shaft that engages with a center hole of the hub. In a disk drive device that rotationally drives a disk medium, a tapered portion is formed in the concave portion of the turntable and a tip end of the shaft, and when chucking the disk medium, the tapered portion of the turntable and the tip end of the shaft closes the hub and the center. Since a configuration is adopted that guides the hole and promotes centering of the disk medium, the guiding action between the tapered part of the turntable and the hub, and between the tapered part of the tip of the shaft and the center hole allows the centering of the disk medium. It has the excellent effects of accurately centering, reliably chucking the disk medium, always allowing normal disk access, and preventing damage to the disk or drive mechanism.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the structure of the turntable section of a disk drive device adopting the present invention, FIG. 2 is a cross-sectional view showing the disk chucking state of the mechanism of FIG. 1, and FIG. 3 is a conventional disk drive. FIG. 3 is a cross-sectional view showing the configuration of a turntable section of the device. 1...Shaft la, 2c...Tapered part 2'...
・Turntable 4...Suction magnet 3...Yoke 5...Disc

Claims (1)

[Claims] 1) In a disk drive device that centers and chucks a disk medium using a turntable having a recess that fits into a hub of the disk medium and a shaft that engages with a center hole of the hub, and rotationally drives the disk medium, the turntable A tapered portion is formed in the concave portion and the tip of the shaft, and when chucking the disk medium, the tapered portion of the turntable and the tip of the shaft guides the hub and center hole to promote centering of the disk medium. disk drive.