JP3961704B2 - Disk holding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk holding device for supporting a disk such as a CD-ROM mounted on a disk turntable so as to be rotatable integrally with the disk turntable, and more particularly to an improvement of a holding mechanism of the turntable. It is.
[0002]
[Prior art]
Conventionally, as one of disk clamp methods such as portable CD players and notebook computer CD-ROM drives, there is a self-holding clamp method using a plurality of balls. This is because a plurality of balls are urged and arranged in the center of the turntable so as to protrude in the radial direction of the turntable so that the disk is held on the turntable by the pressing force generated by the protrusion of the balls. It is a thing. Hereinafter, for example, this type of conventional example described in Japanese Patent Laid-Open No. 3-1557859 will be described in detail.
[0003]
3 and 4 are a plan view and a side view showing the configuration of a conventional disk holding device. In these drawings, a peripheral wall protruding upward is formed at the center of the turntable 1 that is driven to rotate by a spindle motor. 2 is integrally formed, and the ball holder 3 is fixed to the turntable 1 by fitting the cap-shaped ball holder 3 to the peripheral wall 2. The outer diameter of the ball holder 3 is equal to or slightly smaller than the diameter of the center hole of the disk 4. The ball holder 3 has groove-shaped ball guides 5 extending radially in the interior thereof at equal intervals with respect to the circumferential direction at three locations, and each ball guide 5 is provided along the ball guide 5. A ball 6 is disposed so as to be movable. Each ball guide 5 has an opening opened on the outer peripheral surface of the ball holder 3, and each ball 6 is urged outward in the radial direction by a coil spring 7 disposed in each ball guide 5. ing.
[0004]
Further, the side walls 8 in the vicinity of the opening of each ball guide 5 project inward to prevent the balls 6 from dropping off. Each ball 6 is biased by a coil spring 7 so that a part of the ball 6 protrudes from the opening of the ball holder 3. An appropriate dimension determined from the thickness dimension of the disk 4 is secured between the protruding position of the ball 6 and the disk receiving surface of the turntable 1. Reference numeral 12 denotes a spindle motor, and reference numeral 13 denotes a shaft serving as a rotating shaft.
[0005]
Next, the disk loading operation will be described. When the disc 4 is mounted on the turntable 1, as shown by a two-dot chain line in FIG. 4, the center hole of the disc 4 is placed on the ball 6, and the clamp area 9 of the disc 4 is pushed down with a finger. Then, the disk 4 is placed on the turntable 1 while the ball 6 is retracted against the urging force of the coil spring 7. When the disk 4 is placed on the turntable 1, a part of the ball 6 protrudes from the opening of the ball holder 3 by the urging force of the coil spring 7, and the upper edge of the center hole of the disk 4 is pushed by this projecting output. The disk 4 is pressed onto the turntable 1 and can rotate integrally with the turntable 1.
[0006]
On the other hand, when removing the disk 4 from the turntable 4, as shown in FIG. 4, the disk 4 is forcibly lifted by placing a finger on the outer peripheral portion 10 of the disk 4. By doing so, the edge of the central hole of the disk 4 is detached from the ball holder 3 while the ball 6 is retracted against the urging force. Since a large force is applied in the vertical direction of the turntable 1 when the disk 4 is detached, the height of the hub 11 of the turntable 1 indicated by the arrow h1 is increased, and the hub 11 and the spindle motor 12 of the turntable 1 are increased. The joint with the shaft 13 needs to be strengthened. Further, in order to guarantee the press-fitting strength due to secular change, an adhesive 14 is applied to the top surface portion of the shaft 13 of the spindle motor 12 to enhance the press-fitting.
[0007]
[Problems to be solved by the invention]
The conventional disk holding device is configured as described above, and has a structure in which the disk is forcibly attached and detached against the urging force of the ball, so that a large force is applied in the vertical direction of the turntable. . Therefore, it is necessary to increase the press-fitting strength of the spindle motor shaft and the turntable. As a result, the length of the portion indicated by the arrow h1 in FIG. 4 is required, the thickness of the turntable increases, and the product cannot be thinned. Furthermore, since the press-fit strength of the turntable is reduced due to secular change, an adhesive is applied to the top surface of the shaft, and thus there is a problem that the cost cannot be reduced.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a disk holding device capable of reducing the thickness of the product and reducing the cost.
[0008]
[Means for Solving the Problems]
A disk holding apparatus according to claim 1 of the present invention is a disk holding apparatus formed by press-fitting a cylindrical press-fitting portion formed at the center of a turntable on which a circular disc is mounted into a spindle motor shaft. A ring member is provided around the cylindrical press-fit portion and generates a stress that compresses the cylindrical press-fit portion toward the shaft.
[0009]
A disk holding device according to claim 2 of the present invention is the disk holding device according to claim 1, wherein a plurality of guide grooves formed radially on the surface of the turntable around the cylindrical press-fitting portion, A holder that is slidably disposed in the guide groove and elastically biased so that a tip end formed in a curved shape protrudes from an opening formed in the tip end of the guide groove, and The ring member constitutes a bottom surface portion of the guide groove in which the holder is disposed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Hereinafter, a disk holding device according to Embodiment 1 of the present invention will be described with reference to the drawings. The disc clamping apparatus according to the present embodiment is a mechanism for holding a disc that is a recording medium for information signals such as a so-called portable player and an optical disc such as a CD-ROM drive for a notebook personal computer. As shown in FIG. 1, at the center of the upper surface of the resin-molded turntable 15, a cylindrical protrusion 16 for fitting into the center hole of the disk 4 is integrated with the resin-molded turntable 15. Is provided. Further, the protrusion 16 is tapered at the tip. Groove-shaped guides 17 extending in the radial direction are provided in the protrusion 16 at equal intervals in the circumferential direction, and can move along the guide 17 in the guide 17. A CD holder 18 is arranged on the CD. Each guide 17 has an opening opened on the outer peripheral surface of the protrusion 16, and each CD holder 18 is directed radially outward by a coil spring 19 disposed in each guide 17. It is energized. Further, the side walls 20 in the vicinity of the openings of the guides 17 protrude inward to prevent the CD holders 18 from protruding in the outer peripheral direction. Further, as shown in FIG. 2, a metal ring 22 is press-fitted to the outer periphery of the hub 21 of the resin-molded turntable 15.
[0011]
Next, the function and effect will be described. Tensile stress generated in the circumferential direction by the shaft 13 of the spindle motor 12 press-fitted into the hub 21 of the resin-molded turntable 15 by the metal ring 22 causes the metal ring 22 to The hub 21 is press-fitted and a radial compressive stress is generated in the hub 21, thereby reducing a circumferential tensile stress generated in the hub 21, and as a result, the resin-molded turntable. Even if the height of the 15 hub 21 is lower than the conventional one as shown by the arrow h2, the press-fitting strength between the shaft 13 of the motor 12 and the resin-molded turntable 15 is maintained. Since the thickness of the resin-molded turntable 15 can be reduced, the product can be made thinner. The metal ring 22 also serves to prevent the CD holder 18 from falling off when the disk 4 is loaded.
[0012]
As described above, according to the present embodiment, the metal ring 22 is provided around the hub 21 that is fitted to the shaft 13 of the spindle motor 12 of the turntable 15. Therefore, even if the fitting depth between the shaft 13 and the hub 21 is shallow, sufficient press-fitting strength can be obtained, and as a result, the product can be made thinner, Thus, it is not necessary to apply an adhesive to the press-fitted portion of the hub, so that the cost can be reduced.
[0013]
Further, since the ring 22 constitutes the bottom surface portion of the guide 17 on which the holder 18 is disposed, the hub 21 and the guide 17 can be integrally formed on the turntable 15 and the holder can be formed in the guide 17. 18 and a coil spring 19 for biasing it can be easily incorporated.
[0014]
【The invention's effect】
As described above, according to the disk holding device of the first aspect of the present invention, the cylindrical press-fitting part formed at the center of the turntable on which the circular disk is mounted is press-fitted into the spindle motor shaft. In the disk holding device according to the present invention, it is provided with a ring member that is attached around the cylindrical press-fit portion and generates a stress that compresses the cylindrical press-fit portion toward the shaft side. Adequate press-fit strength can be obtained even if the press-fit depth with the shaft is shallow, no adhesive is required to enhance the press-fit strength of the turntable shaft, and the turntable thickness is reduced. Therefore, it is possible to achieve an effect that the product can be thinned and the cost can be reduced.
[0015]
According to the disk holding device of claim 2 of the present invention, in the disk holding device of claim 1, a plurality of guide grooves formed radially on the surface of the turntable around the cylindrical press-fitting portion. And a holder that is slidably disposed in the guide groove and elastically biased so that a curved tip is protruded from an opening formed at the tip of the guide groove. Since the ring member constitutes the bottom surface of the guide groove in which the holder is disposed, the press-fit portion and the guide groove can be integrally formed on the turntable, and the guide groove can be formed in the guide groove. The holder can be easily assembled.
[Brief description of the drawings]
FIG. 1 is a cross-sectional plan view centering on a turntable showing an example of a disk holding device according to Embodiment 1 of the present invention;
FIG. 2 is a front sectional view of the disk holding device.
FIG. 3 is a cross-sectional plan view showing an example of a conventional disk holding device.
FIG. 4 is a front cross-sectional view showing a state where a disk is attached and detached by the conventional disk holding device.
[Explanation of symbols]
2 peripheral wall 3 ball holder 4 disk 5 ball guide 19 coil spring 20 side wall 21 turntable hub 12 spindle motor 13 shaft 15 turntable 16 turntable protrusion 17 guide 18 CD holder 22 metal ring

Claims (2)

In a disk holding device formed by press-fitting a cylindrical press-fitting portion formed at the center of a turntable on which a circular disc is mounted on a spindle motor shaft,
A disk holding device comprising a ring member attached around the cylindrical press-fit portion and generating a stress for compressing the cylindrical press-fit portion toward the shaft. The disk holding device according to claim 1, wherein
A plurality of guide grooves formed radially on the surface of the turntable around the cylindrical press-fit portion;
A holder that is slidably disposed in the guide groove and elastically biased so that a tip formed in a curved surface protrudes from an opening formed in the tip of the guide groove;
The disk holding device according to claim 1, wherein the ring member constitutes a bottom surface portion of a guide groove in which the holder is disposed.

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