JP3760381B2 - Disc clamp device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk clamp device.
[0002]
[Prior art]
A disc player that plays a disc such as a CD or a DVD is provided with a disc clamping device. This disc clamping device is a device that places a disc transferred by a roller on a turntable, presses the disc from above with a clamper, and fixes it on the turntable. In this state, the turntable is rotated by a motor. Then, the disk can be rotated together with the clamper, and the data on the disk can be read by detecting the reflected light by applying a laser beam from the optical head to the disk.
[0003]
In this disk clamping device, holding and rotating the disk without being eccentric is very important for accurately reading data from the disk. Therefore, on the turntable of the disc clamp device, there is a disc centering structure for centering (centering) between the turntable and the disc, and a clamper centering for centering (centering) between the turntable and the clamper. A structural part is provided. Of these two centering structures, the clamper centering structure is hidden in the disk centering structure so as not to obstruct the disc being transferred, and only when the disk is placed on the turntable. It is preferable that the clamper can be centered by ascending, protruding onto the disk centering structure and the disk, and fitted to the lowered clamper.
[0004]
Therefore, conventionally, for example, as disclosed in JP 2000-298904 A, an operation lever is attached to a turntable, and when the disk is placed on the turntable, the operation lever is operated and rotated by the lower surface of the disk, The clamper centering structure (more specifically, “clamper centering ring”) is raised in conjunction with the rotation.
[0005]
[Problems to be solved by the invention]
However, the method of attaching the operation lever to the turntable to raise the clamper centering ring has a problem that the number of parts increases and the structure of the turntable portion becomes complicated.
[0006]
The present invention has been made in view of the above points, and an object of the present invention is to provide a disk clamp device that can reduce the number of parts, simplify the structure of the turntable portion, and raise the clamper centering ring.
[0007]
[Means for Solving the Problems]
The disc clamping device of the present invention is provided with a turntable on which a disc is placed and driven to rotate, and on the upper surface of the turntable, provided on the circumference concentric with the center of the turntable at predetermined intervals. The center hole of the disc placed on the turntable is fitted outside so that the disc is centered, and at that time, the edge of the center hole of the disc abuts against the outer wall portion. A plurality of disc centering members that are slid inwardly of the turntable, and provided inside the plurality of disc centering members so as to be movable up and down. When the alignment member is slid inward of the turntable as described above, the clamper centering link is operated so as to be raised by the contact portion. A spring member that is stretched between the clamper centering ring and the turntable and applies a downward force to the clamper centering ring, and a disk placed on the turntable above the turntable. And a clamper that is centered by being engaged with the clamper centering ring that is raised and protrudes above the disk centering member when lowered to hold down from above.
[0008]
As a preferred embodiment, the disk clamp device is provided with an annular support on the circumference of the upper surface of the turntable, and a tunnel shape penetrating in the inner and outer directions of the turntable at a plurality of locations in the circumferential direction of the support. The plurality of disk centering members are slidably provided by being inserted into the through holes one by one. At that time, it is preferable that three through holes and disk centering members are provided on the circumference at intervals of 120 °. In addition, the outer wall of the disk centering member that contacts the edge of the center hole of the disk and the inner wall of the disk centering member that contacts the contact part of the clamper centering ring are both formed on a slope that recedes upward. Is done. Furthermore, a stopper is provided on the upper surface of the turntable so that the disk centering member does not slide more than necessary in the outer direction of the turntable. Further, a central axis projects from the upper surface of the central portion of the turntable, and a clamper centering ring is fitted to the central axis, and the clamper centering ring moves up and down along the central axis.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a disk clamp device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 and FIG. 2 are views showing an embodiment of a disc clamping device according to the present invention. In particular, FIG. 1 is a diagram in a disc loaded state, and FIG. 2 is a diagram in a disc ejected state. In each figure, (a) is a plan view of a turntable portion, and (b) is a sectional view taken along the line bb of (a) showing a state where a clamper is added.
[0010]
In these drawings, reference numeral 11 denotes a turntable, and a driving motor 12 is integrally formed below the turntable. A central shaft 13 is provided at the center of the turntable 11, and the upper end of the central shaft 13 protrudes above the upper surface of the turntable 11. A friction material 14 that is in contact with the lower surface of the disk 31 placed on the turntable 11 is attached to the upper surface of the outer peripheral end of the turntable 11. Further, on the upper surface of the turntable 11, an annular support 15 is located on a circumference concentric with the center of the turntable 11 (the central axis 13) at an intermediate position in the inside / outside (radial direction) of the turntable 11. Is installed. Tunnel-like through-holes 16 penetrating in the inner and outer directions of the turntable 11 are formed at a plurality of locations in the circumferential direction of the support 15 (in this embodiment, three locations at intervals of 120 °). A small piece of a disk centering member (hereinafter simply referred to as a centering member) 17 is inserted into the through hole 16 one by one and is slidable inward and outward of the turntable 11. Since the centering member 17 is provided by being inserted into the through hole 16 of the support 15, the centering member 17 is provided on the upper surface of the turntable 11 in the same manner as the support 15 and the through hole 16. A plurality of (three in this embodiment) are provided at predetermined intervals (120 ° intervals in this embodiment) on a circumference concentric with the center of the turntable 11 at intermediate positions in the inner and outer directions. The outer wall portion of the centering member 17 located in the outer side direction of the support 15 is a slope 18 that retreats upward. Similarly, the inner wall portion of the centering member 17 located in the inner direction of the support body 15 is a slope 19 that retreats upward. A stopper 20 is provided on the upper surface of the turntable 11 on the outside of the centering member 17 so that the centering member 17 does not slide beyond the turntable 11 more than necessary.
[0011]
A clamper centering ring (hereinafter simply referred to as a centering ring) 21 is provided on the inner side of the centering member 17 and the support 15 so as to be fitted to the center shaft 13 of the turntable 11 and freely move up and down. A flange 22 protrudes from the outer peripheral surface of the lower end of the centering ring 21, and the tip of the flange 22 abuts against the inner wall slope 19 of the centering member 17. A spring material 23 is stretched between the centering ring 21 and the turntable 11, and a force is applied to the centering ring 21 in the downward direction (that is, the upper surface direction of the turntable 11). Due to the arrangement of the spring material 23, the support 15 has a part 15 a separated from the other part 15 b.
[0012]
On the other hand, a clamper 25 is provided above the turntable 11 and supported by the clamper bracket 24. On the lower surface of the center portion of the clamper 25, a fitting portion 26 is formed which is fitted to the centering ring 21 to center the clamper 25. In addition, a pressing member 27 for pressing the disk 31 placed on the turntable 11 is attached to the lower surface of the clamper 25 on the outer peripheral end side.
[0013]
In the disc clamping apparatus as described above, in the disc removal state of FIG. 2, the centering ring 21 is moved downward by the force of the spring member 23, the centering ring 21 is pressed against the upper surface of the turntable 11, and the support body. The centering ring 21 is hidden inside the centering member 15 and the centering member 17. In this state, the inner wall slope of the centering member 17 is pushed by the tip of the lower end flange portion 22 of the centering ring 21, so that the centering member 17 reaches the position where it hits the stopper 20. It slides outward. In this state, the outer wall slope 18 of the centering member 17 projects slightly outward from the outer edge of the support 15.
[0014]
Next, when the disk 31 is transferred onto the turntable 11, the disk 31 is turned while the center hole 31a is fitted to the outside of the centering member 17 and centering is performed as shown in FIG. Although it is placed on the table 11, the edge of the center hole 31 a comes into contact with the outer wall slope 18 of the centering member 17 at the beginning of the fitting with respect to the centering member 17. It is fitted to the lower part of the centering member 17 while being slid inwardly and placed on the turntable 11. At this time, when the centering member 17 is slid inward of the turntable 11 as described above, the tip end portion of the lower end flange portion 22 of the centering ring 21 comes into contact with the inner wall slope of the centering member 17. Therefore, the centering ring 21 moves upward along the central axis 13 against the force of the spring member 23. That is, the centering ring 21 protrudes above the support 15 and the centering member 17. Therefore, when the clamper 25 is lowered to hold the disk 31 on the turntable 11 from above, the fitting portion 26 of the clamper 25 is fitted to the centering ring 21 and the clamper 25 is centered. . In the state where the centering ring 21 is raised, a downward force from the spring member 23 is applied as an outward force to the centering member 17 via the centering ring 21, so that the centering member 17 (and also the centering ring 21). 21) is held in a fixed state, so that the centering of the disk 31 and the clamper 25 is performed stably and accurately.
[0015]
As described above, according to the disk clamp device described above, the clamper centering ring 21 is raised by using the movement of the disk centering member 17 when the disk 31 is placed. Therefore, a conventional operation lever is not required, the number of parts can be reduced, and the structure of the turntable portion can be simplified.
[0016]
It should be noted that the method of providing three disk centering members 17 at intervals of 120 ° is optimal, but a plurality of other numbers may be used.
[0017]
【The invention's effect】
As described above in detail, according to the disk clamp device of the present invention, the number of parts can be reduced and the structure of the turntable portion can be simplified.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing an embodiment of a disc clamping device according to the present invention in a disc mounting state, (a) is a plan view of a turntable portion, and (b) is shown with a clamper added (a). FIG.
FIGS. 2A and 2B are diagrams showing an embodiment of a disk clamping device according to the present invention in a disk removal state, where FIG. 2A is a plan view of a turntable portion, and FIG. 2B is a state with a clamper added; bb sectional view taken on the line.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Turntable 13 Center axis | shaft 15 Support body 16 Through-hole 17 Disk centering member 18 Outer wall part slope 19 Inner wall part slope 20 Stopper 21 Clamper centering ring 23 Spring material 25 Clamper 26 Fitting part 31 Disk 31a Center hole

Claims (6)

A turntable on which a disk is mounted and driven to rotate;
On the upper surface of this turntable, it is provided at a predetermined interval on the circumference concentric with the center of the turntable, can slide inward and outward of the turntable, and the center hole of the disk placed on the turntable fits outside. A plurality of disc centering members that are centered on the disc by being combined, and at that time the center hole edge of the disc abuts against the outer wall portion and slides inward of the turntable,
When the disc centering member is slid toward the inside of the turntable as described above, the disc centering member is provided inside the plurality of disc centering members so as to be movable up and down. A clamper centering ring that is operated to rise by the abutting portion;
A spring material that is stretched between the clamper centering ring and the turntable and applies a downward force to the clamper centering ring;
The clamper is positioned above the turntable and is fitted to the clamper centering ring that rises and protrudes above the disk centering member when lowered to hold the disk placed on the turntable from above. And a clamper for centering the disc. An annular support is mounted on the circumference of the upper surface of the turntable, and tunnel-like through holes are formed at a plurality of locations in the circumferential direction of the support so as to penetrate inward and outward of the turntable. 2. The disk clamping device according to claim 1, wherein the plurality of disk centering members are slidably inserted one by one. 3. The disk clamp device according to claim 2, wherein the through hole and the disk centering member are provided on the circumference at three intervals of 120 [deg.]. Both the outer wall portion of the disc centering member with which the center hole edge of the disc abuts and the inner wall portion of the disc centering member with which the abutting portion of the clamper centering ring abuts are formed on slopes that recede as they go upward. 4. A disk clamping device according to claim 1, wherein 5. The disk clamping device according to claim 1, wherein a stopper is provided on the upper surface of the turntable so that the disk centering member does not slide more than necessary in the outer direction of the turntable. The center axis of the turntable has a central axis projecting thereon, a clamper centering ring is fitted to the central axis, and the clamper centering ring moves up and down along the central axis. The disc clamp device according to any one of 5 to 5.

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