JPH0668567A - Disk table for self-chucking - Google Patents

Abstract

PURPOSE:To improve the thin profile and the reliability by providing an elastic suction cup sucking a circumferential part of a center hole of a disk and pressing and fixing the disk onto a flange so as to apply this method to a disk device at a fast disk rotating speed. CONSTITUTION:A suction cup 15 made of an elastic material such as rubber or soft plastic and formed annularly is arranged concentrically in an annular gap 16 between a boss 2 and a flange 3 in this disk table. In this case, when a fixed point of the disk 12 is moved onto a flange 3 from an inner circumference of a center hole 13, the radius of the fixed point is extended. Moreover, a fixing force of the disk 12 is doubled in comparison with that of a conventional method through a combined force comprising a negative pressure of suction of the suction cup 15 and a pressing force by three balls 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-chucking disk table suitable for application to a disk device such as a CD (compact disk) player or a CD-ROM drive.

[0002]

2. Description of the Related Art Conventionally, there is a self-chucking disk table shown in FIG. 6 which is applied to a disk device such as a CD player.

In this self-chucking disk table 1, a centering boss 2 and a flange 3 are integrally formed concentrically, and a tapered surface 4 is formed on the outer periphery of the boss 2. Then, the three balls 6 as the engaging elements are loosely fitted in the three lateral holes 5 formed in the trisection of the outer periphery of the boss 2, and the bias is applied to the annular hole 7 formed inside the three lateral holes 5. By incorporating the O-ring 8 which is a means,
The three balls 6 are urged toward the outside of the lateral hole 5 by a ring 8. The self-chucking disk table 1 is configured to be rotationally driven by a spindle 10 of a spindle motor 9.

When the recording and / or reproducing disk 12 such as a CD is fitted into the outer periphery of the boss 2 by the central hole 13 in the direction of arrow a, the three balls 6 are elastically repulsed by the O-ring 8. The disk 12 is pressed onto the flange 3 by elastically engaging the inner peripheral upper edge 13a of the center hole 13, and the center surface of the center hole 13 is centered by the tapered surface 4.

[0005]

However, in the conventional ball type disc table 1 for self-chucking,
3 for the inner peripheral upper edge 13a of the center hole 13 of the disk 12
Since the disk 12 is fixed only by the pressing force by the point contact of the two balls 6, the fixing force is very weak.

Moreover, since the fixing point of the disk 12 by the three balls 6 is on the inner circumference of the center hole 13 and the radius of the fixing point is very small, it is against the centrifugal force, vibration, shock and the like. Inability to exert sufficient fixing force.

For this reason, the conventional ball-type self-chucking disk table 1 can be applied to a disk device such as a CD player in which the rotation speed of the disk 12 does not suddenly rise or fall. CD-RO
When the present invention is applied to a disk device such as the M drive, which has a fast seek speed for computer compatibility and a sudden torque is constantly applied to the disk 12, the disk 12 and the self-chucking disk table 1 are constantly connected between the disk 12 and the disk table 1. There was a problem that slips would occur.

Therefore, the conventional ball-type self-chucking disk table 1 has a significantly lower value against vibration, shock, etc. than the conventional magnetic chucking method. However, in order to reduce the thickness of the disk device, the magnetic chucking method has limitations, and there is an urgent need to develop a high-performance chucking structure for a self-chucking disk table that can be thinned.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a self-chucking disk table capable of greatly increasing the disk fixing force.

[0010]

The self-chucking disk table of the present invention for achieving the above object comprises a centering boss into which a central hole of a recording and / or reproducing disk is fitted. A flange is provided on the outer periphery of the boss, on which the disc is placed, and a suction cup having elasticity for adsorbing the peripheral portion of the center hole of the disc and pressing and fixing the disc on the flange. At this time, it is preferable to provide a plurality of engaging elements elastically engaged with the inner peripheral upper edge of the center hole of the disc on the outer periphery of the boss,

[0011]

In the disk table for self-chucking of the present invention constructed as described above, since the periphery of the center hole of the disk is sucked by the suction cup and pressed and fixed onto the flange, the fixing point of the disk is within the center hole. The radius of the fixing point can be increased by moving it from the circumference to the flange, and the fixing force of the disc can be greatly increased by utilizing the negative pressure due to the suction of the suction cup.

[0012]

Embodiments of the self-chucking disk table to which the present invention is applied will be described below with reference to FIGS. The same structural parts as those in FIG. 6 are designated by the same reference numerals to omit redundant description.

First, FIGS. 1 to 3 show a first embodiment of a self-chucking disk table 1, in which a single suction cup 15 is formed in an annular shape by an elastic member such as rubber or soft plastic. Are arranged concentrically in an annular gap 16 between the boss 2 and the flange 3,
The suction surface 15a of the suction cup 15 faces upward, and the bottom surface 15b
Is attached to the bottom surface 16a in the annular gap 16 by adhesion or the like.

According to this self-chucking disk table 1, as shown in FIG. 1, when the disk 12 is fitted into the outer periphery of the boss 2 through the center hole 13 in the direction of the arrow a, the three balls 6 are O-shaped. The elastic repulsive force of the ring 8 elastically engages the inner peripheral upper edge 13a of the center hole 13, and the tapered surface 4 centers the center hole 13.

Moreover, at this time, the center hole 13 of the disk 12
The peripheral portion 12a of the disk is sucked by the suction surface 15a of the suction cup 15 from the direction of the arrow a, and the negative pressure of the suction cup 15 in the direction of the arrow b is used to self-chuck the disk 12 so as to press it onto the flange 3. Is.

Therefore, according to the self-chucking disk table 1, the fixed point of the disk 12 can be moved from the inner periphery of the center hole 13 onto the flange 3 to increase the radius of the fixed point. Since the fixing force of the disk 12 can be doubled as compared with the conventional one by the combined force of the negative pressure due to the suction of the suction cup 15 and the pressing force by the three balls 6, the disk 12 is extremely strong on the self-chucking disk table 1. Can be fixed to.

Moreover, in the self-chucking disk table 1, since the elastic body such as rubber or flexible plastic forming the suction cup 15 has a vibration-proof property, the disk 12 is vibrated and shocked. The characteristics for can be greatly improved.

Next, FIG. 4 shows a second embodiment. In this case, a plurality of suction cups 15 formed in a small circle shape.
Are arranged at equal intervals in the annular gap 16 and attached by adhesion or the like.

Next, FIG. 5 shows a third embodiment. In this case, a plurality of suction cups 15 formed in a small circle shape.
Are attached to the upper surface of the flange 13 by bonding or the like in a plurality of notches 17 formed at equal intervals.

Then, both of the first and second embodiments can achieve the same effect as that of the first embodiment.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications can be made based on the technical idea of the present invention. For example,
The engagement element may be a so-called protrusion other than the ball 6.

[0022]

The self-chucking disk table of the present invention constructed as described above has the following effects.

According to a first aspect of the present invention, the periphery of the center hole of the disk is sucked by a suction cup and pressed and fixed on the flange, and the fixing point of the disk is moved from the inner circumference of the center hole to the flange, The radius of the fixing point can be expanded, and the negative pressure due to the suction of the suction cup can be used to significantly increase the fixing force of the disk, which is a drawback of the conventional ball-type self-chucking disk table. While compensating for this, thin and reliable disc self-chucking can be performed. Therefore, it can be applied to a disk device such as a CD-ROM drive in which the rotation speed of the disk is high, so that the device can be made thinner and the reliability can be improved.

According to the first aspect, the vibration-proof property of the elastic member forming the suction cup can significantly improve the characteristics of the disk against vibration, shock and the like.

According to the second aspect of the present invention, the fixing force of the disc utilizing the negative pressure by the suction cup and the fixing force of the central hole portion of the disc by the plurality of engaging elements can be combined, so that the fixing force of the disc can be doubled. .

[Brief description of drawings]

FIG. 1 is a sectional side view showing a chucking state of a disc in a first embodiment of a self-chucking disc table of the present invention.

FIG. 2 is a sectional side view showing the disk before chucking in the first embodiment.

FIG. 3 is a plan view of FIG.

FIG. 4 is a plan view showing a second embodiment of the self-chucking disk table of the present invention.

FIG. 5 is a plan view showing a third embodiment of the self-chucking disk table of the present invention.

FIG. 6 is a sectional side view showing a conventional ball-type self-chucking disk table.

[Explanation of symbols]

 1 Self-chucking disk table 2 Centering boss 3 Flange 4 Ball (engager) 8 O-ring (biasing means) 12 Disk 12a Around the center hole of the disk 13 Center hole 13a Upper edge of the center hole 15 Sucker

Claims (4)

[Claims] 1. A centering boss into which a center hole of a disc for recording and / or reproducing is fitted, a flange arranged on the outer periphery of the boss for mounting the disc, and a center of the disc. A disc table for self-chucking, comprising: a suction cup having elasticity for adsorbing a peripheral portion of a hole and pressing and fixing it on the flange. 2. The self-chucking disk according to claim 1, wherein a plurality of engaging elements that are elastically engaged with the inner peripheral upper edge of the center hole of the disk are provided on the outer circumference of the boss. table. 3. The disk table for self-chucking according to claim 1, wherein the suction cup is formed in an annular shape, and the suction cup is concentrically arranged on the outer periphery of the boss. 4. The self-chucking disk according to claim 1, wherein the suction cups are formed in a small circle shape, and a plurality of the suction cups in the small circle shape are arranged at equal intervals on the outer circumference of the boss. table.