JPH0863848A - Vibration preventing plate - Google Patents

Abstract

PURPOSE: To obtain a vibration preventing plate enabling stable reproduction while preventing a deformation of a disc and suppressing a surface shift of the disc during the rotation in a disc apparatus. CONSTITUTION: The plate has a turntable rotating with a disc loaded thereon and a clamp part holding the disc. The disc clamp part 1 has projecting parts 2 each having a generally flat surface faced to be in touch with a surface of the disc placed on the turntable, and recessed parts 3 alternately provided with the projecting parts 2 on the circumference. Moreover, tone plate has hole parts at a generally central part of the clamp part. The recessed parts 3 and projecting parts 2 are radially extended almost from the center of the clamp part. Accordingly, the disc is prevented from vibrating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording and reproducing signals using a disc, and more particularly to a vibration prevention plate of a disk vibration prevention device.

[0002]

2. Description of the Related Art Conventionally, in a recording / reproducing apparatus using an optical disk, a magneto-optical disk, etc., a pickup for performing recording / reproducing is arranged on the turntable side, and an optical disk apparatus for reading and reproducing a signal from a rotating disk, In order to perform stable reproduction of the disc, the vibration of the disc surface is prevented by a vibration prevention plate as shown in FIG. 6 for preventing the vibration of the disc so as not to cause surface wobbling. FIG. 6 is a schematic view when a conventional vibration prevention plate is applied to a clamp portion of an optical disk device. In FIG.
In order to bring the anti-vibration plate 13 into close contact with the disk 6, the disk-shaped anti-vibration plate 13 having a substantially flat surface is tapered by rotating the spindle motor 7 from the substantially central portion of the plate surface to the outer periphery. The vibration-preventing plate 13 is placed on the disk 6 mounted on the turntable 8 and pressed by the weight of the vibration-preventing plate 13 so as to be in close contact. That is, the vibration of the disk made of polycarbonate, acrylic or the like is corrected by the flat surface of the vibration prevention plate 13 by the weight of the vibration prevention plate 13 to prevent the vibration.

[0003]

However, in the prior art, the tapered vibration-preventing plate prevents the vibration of the disk surface by pressing it against the disk due to its weight. Was there. In addition, the weight of the vibration prevention plate exerts a heavy load on the spindle motor.

[0004]

According to the present invention, in a disk device having a turntable for mounting and rotating a disk and a clamp portion for holding the disk, a surface facing and contacting the disk surface mounted on the turntable is provided. A disk-shaped clamp part having a substantially flat convex part and a convex part and a concave part provided alternately on the circumference, and a hole part in the central part of the clamp part and a concave part and a convex part provided in the clamp part. It is a vibration prevention plate that is provided radially from the center.

According to the present invention, in a disc device having a turntable on which a disc is placed and rotated and a clamp portion which holds the disc, a convex portion whose surface facing and in contact with the disc surface placed on the turntable is a substantially flat surface. A disk-shaped clamp part that has convex parts and concave parts that are provided alternately on the circumference, and a hole and a concave part and convex part that are provided in the clamp part in the approximate center of the clamp part. It is an anti-vibration plate spirally provided on the.

[0006]

According to the anti-vibration plate of the present invention, the circular anti-vibration plate is provided with the groove for discharging the gas from substantially the center to the outer periphery. The gas is discharged toward the outer periphery by the centrifugal force in the passage formed by the groove of the vibration prevention plate, the atmospheric pressure in the passage formed by the disc and the vibration prevention plate is lowered, and the disc and the vibration prevention plate are adsorbed.

According to the anti-vibration plate of the present invention, the circular anti-vibration plate is provided with the groove for discharging the gas from the substantially center to the outer periphery, and the groove on the outer peripheral portion is oriented in the rotational direction of the disk. When the disc is placed on a turntable and rotated, the passage formed by the disc surface and the groove of the anti-vibration plate moves in the disc rotation direction toward the outer periphery by the centrifugal force, and the passage formed by the disc and the anti-vibration plate. The air pressure inside is significantly lowered, and the adsorption between the disc and the vibration-proof plate can be enhanced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a vibration preventive plate according to an embodiment of the present invention, and (a) is a bottom view of the vibration preventive plate. (B)
[Fig. 3] is a side view of the vibration prevention plate. In FIGS. 1 (a) and 1 (b), one side of the disk-shaped vibration-preventing plate 1 is equidistant to form a passage through which gas flows from the approximate center of the vibration-preventing plate having a substantially flat surface to the outer periphery. The convex portions 2 and the concave portions 3 are alternately and radially provided. The convex portion 2 and the concave portion 3 continuously form irregularities on the substrate surface of the vibration prevention plate 1.

Both sides X and Y of the convex portion 2 and the concave portion 3 are substantially equal, and the groove depth formed by the concave portion 3 and the convex portion 2 is approximately two-thirds in the radial direction from the substantial center of the vibration prevention plate 1. Up to (indicated by a dotted line in the figure), the depth of the groove is almost the same, and the depth of the groove is gradually inclined from approximately two-thirds of the radius so that the depth becomes deeper toward the outermost circumference. Although the depth of the groove is approximately half of the substrate thickness of the vibration prevention plate 1, it may be any depth as long as it can obtain a flow velocity that causes adsorption to the disk.
The convex portion 2 and the concave portion 3 are fan-shaped toward the outer circumference of the vibration prevention plate 1, and the outer circumference side of the vibration prevention plate 1 is wide and the center side thereof is narrow.

The surface (convex portion 2) of the vibration-preventing plate 1 which contacts the disk is a substantially flat surface so that the gas leakage from the gap from the surface contacting the disk is reduced. A hole 4 is formed in the center of the vibration prevention plate 1 so as to penetrate the plate to serve as a gas inlet. Further, a ring-shaped magnet 5 shown in FIG. 1B is fixedly attached to the vibration prevention plate 1 at the center of the vibration prevention plate 1. The vibration prevention plate 1 as described above is sucked through the hole 4 in the rotation direction of the vibration prevention plate 1 and the disk 6 shown by the arrow 1a, as shown in the operation explanatory view of the vibration prevention plate of FIG. The gas is discharged as shown by the arrow 1b, and the vibration prevention plate 1 and the disk 6 are adsorbed. Therefore, disk vibration can be prevented by placing the disk on a compact disk (hereinafter referred to as a CD) which is rotated by a turntable such as an optical disk device and rotating the disk together with the disk.

Although a hole 4 is provided as a gas suction port in the substantial center of the vibration prevention plate 1, the disk 4 will be adsorbed to the disk even if the hole 4 is not provided. Can be increased. The diameter of the vibration prevention plate 1 is substantially equal to the diameter of the disk 6. This vibration prevention plate 1 has a diameter of 12
12 cm of the same diameter is most suitable when used for a CD of cm, but it is not always necessary that the diameter is the same.
May be larger or smaller than. For example, the diameter is 8
Since it is shared with a CD single of cm, even if the diameter of the vibration-preventing plate 1 is about 8 cm, a sufficient suction force can be obtained for a CD of 12 cm. Further, even if the vibration-preventing plate having a diameter of 12 cm is used for a CD single having a diameter of 8 cm, a suction force can be obtained if the groove formed by the convex portion 2 and the concave portion 3 and the disk 6 form a gas discharge passage for adsorption. The disc vibration can be prevented.

FIG. 3 is a schematic view when the vibration prevention plate of one embodiment of the present invention is applied to a clamp portion of an optical disk device. The disc 6 is mounted on a spindle motor 7 and placed on a turntable 8 made of metal such as iron. Then, the vibration-preventing plate 1 is placed as a clamp portion on the surface of the optical pickup 9 opposite to the reading surface side of the signal recorded on the disk 6. The ring-shaped magnet 5 provided on the surface of the vibration prevention plate 1 opposite to the surface in contact with the disk 6 causes the turntable 8 and the vibration prevention plate 1 to move.
Are attracted by the magnet 5 via the disk 6 and are axially attached. The magnet 5 prevents the disk 6 from slipping from the center of the turntable 8 until the spindle motor 7 reaches a steady rotation speed. The rotation of the spindle motor 7 attracts the disk 6 and the vibration prevention plate 1 to suppress the vibration of the disk.

FIG. 4 is a perspective view of a vibration preventing plate showing another embodiment of the present invention. FIG. 4 shows a spiral shape of the concave portion 10 and the convex portion 11 provided on the substrate surface of the vibration prevention plate, and the concave portion 10 and the convex portion 11 are spiral grooves in the same direction with respect to the rotation direction of the substrate. The unevenness is provided so that
The side X'of the groove is made longer than the side Y'to make the air flow on the side X'side faster and further reduce the pressure in the gas discharge passage formed by the groove of the disk and the vibration-preventing plate 14 so that the adsorbability is improved. I am trying to increase.

FIG. 5 is a bottom view of a vibration prevention plate showing another embodiment of the present invention. FIG. 5 shows the vibration prevention plate 1 along the concave portions 3 provided radially on the substrate surface of the vibration prevention plate 1.
Two holes 12 are provided near the center. in this case,
As in FIG. 1, when the anti-vibration plate rotates with the disc, gas is sucked from the holes 12 and discharged through the recesses, so that the disc 6 is adsorbed to the anti-vibration plate 1. By providing the holes 12 along the concave portions 3, it is possible to make the disks 6 adhere more uniformly. Although the number of the holes 12 is two, it may be one or three or more.

As the material of the vibration preventing plate 1 described above, an acetal resin, which is a polymer material that is strong and rigid against mechanical vibration, is suitable, but a fluororesin or the like may be used.

According to the present invention, since the groove formed by the concave portion and the convex portion is provided radially from the substantially center of the substantially disc-shaped vibration preventing plate to the outer periphery, the grooved surface of the vibration preventing plate faces the disk surface. When placed and rotated, the disc and the anti-vibration plate are attracted to each other, and the disc is corrected by the convex portion of the anti-vibration plate having a substantially flat surface to prevent the disc from being deformed. Stable reproduction is possible.

When the anti-vibration plate of the present invention is placed with the grooved surface facing the disc surface and rotated, the disc and the anti-vibration plate can be attracted to each other, so that a lightweight anti-vibration made of acetal resin or the like is used. The plate can prevent the vibration of the disk and reduce the load on the spindle motor.

[0018]

According to the present invention, since the grooves are formed by the concave portions and the convex portions radially provided from the substantially center to the outer periphery of the substantially disk-shaped vibration-preventing plate, the disk is placed on the disk and rotated. The vibration-preventing plate adheres to the disk to prevent the disk from vibrating.

[Brief description of drawings]

FIG. 1A is a bottom view of a vibration prevention plate showing an embodiment of the present invention. (B) is a side view of the vibration-proof plate showing one embodiment of the present invention.

FIG. 2 is an operation explanatory view of the vibration prevention plate in the present invention.

FIG. 3 is a schematic diagram when the vibration prevention plate according to the embodiment of the present invention is applied to a clamp portion of an optical disk device.

FIG. 4 is a perspective view of an anti-vibration plate showing another embodiment of the present invention.

FIG. 5 is a bottom view of a vibration prevention plate according to another embodiment of the present invention.

FIG. 6 is a schematic view when a conventional vibration prevention plate is applied to a clamp portion of an optical disk device.

[Explanation of symbols]

 1, 13 and 14 Vibration prevention plate 2, 11 Convex part 3, 10 Recessed part 4 Hole part 5 Magnet 6 Disk 7 Spindle motor 8 Turntable 9 Optical pickup 12 Hole

Claims (2)

[Claims] 1. A disk device having a turntable for mounting and rotating a disk and a clamp part for holding the disk, and a convex part having a substantially flat surface facing and in contact with the surface of the disk mounted on the turntable. The disk-shaped clamp portion having the convex portion and the concave portion provided alternately on the circumference, and the hole and the concave portion and the convex portion provided in the clamp portion in the substantially central portion of the clamp portion. Anti-vibration plate that is provided radially from the center. 2. A disk device having a turntable for mounting and rotating a disk and a clamp part for holding the disk, wherein a convex portion having a substantially flat surface facing and in contact with the surface of the disk mounted on the turntable. The disk-shaped clamp portion having the convex portion and the concave portion provided alternately on the circumference, and the hole and the concave portion and the convex portion provided in the clamp portion in the substantially central portion of the clamp portion. The anti-vibration plate according to claim 1, wherein the anti-vibration plate is provided in a spiral shape from the center in the rotation direction of the disk.