JPS6241400Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a mounting device for high-density recording disks such as video disks and PCM disks. Another object of the present invention is to provide a disk mounting device that can be mounted reliably.

In general, unlike audio disks, high-density recording disks such as video disks and PCM disks rotate at high speeds, and if the disk itself is unstable during rotation, it will affect the focus servo and cause the information signal to be distorted. There is a problem that makes recording and playback difficult. Therefore, the above-mentioned disk must be attached to the turntable accurately and reliably, and it is desired that the disk be easily replaced. Conventionally, when attaching the above-mentioned disk to a turntable, as shown in FIG.
Attach the turntable 3 to the turntable 3, insert the center hole of the disk 4 into the cylindrical portion 3b provided on the turntable 3 to hold it, and insert the center hole of the presser metal fitting 5 into the cylindrical portion 3b of the turntable 3. The disk 4 is pressed against the flat surface 3a of the turntable 3 by the weight of the presser metal fitting 5. However, the weight of the conventional disk mounting device described above is determined by the shape of the presser metal fitting 5, and it is difficult to increase the weight of the presser metal fitting 5 itself. The frictional force with the flat part 3a of the table 3 is insufficient, and the turntable 3
There was a problem that the disk 4 slipped at the beginning of rotation. Therefore, it is conceivable to attach a sheet material with a large coefficient of friction, such as rubber, to the flat part 3a of the turntable 3, but in this case, the flatness of the flat part 3a of the turntable 3 is deteriorated and the disc 4 is There was a problem in that it became difficult to accurately maintain the horizontal position, which affected the focus servo and made it difficult to record and reproduce information signals.

The present invention solves these conventional drawbacks, and the other ends of a plurality of support arms made of an elastic body with a weight at the tip are rotatable within the diameter of a protrusion provided in the center of the turntable. At the same time, each of the plurality of support arms is elastically biased in a radially inward direction of the central protrusion of the turntable, and as the turntable rotates, the weight body resists the elastic bias and moves toward the cylinder of the turntable. It is constructed so that it protrudes outside the diameter of the section. With this structure, as the turntable rotates, the weight body is positioned on the surface of the disk inserted and held in the cylindrical part of the turntable, and due to the elastic force of the support arm made of an elastic body that supports the weight body. This has the advantage that the disk can be strongly pressed against the flat surface of the turntable, and the frictional force between the flat surface of the turntable and the disk can be increased to ensure reliable attachment.

Hereinafter, the disk mounting device of the present invention will be explained with reference to drawings of embodiments.

2 and 3 show an embodiment of the disk mounting device of the present invention. In the figures, 11 is a motor, 12 is a rotating shaft driven to rotate at high speed by this motor 11, and 13 is the above-mentioned A turntable attached to the rotating shaft 12, 14 is the turntable 1 mentioned above.
It is a disk mounted on 3. The turntable 13 has a flat part 13a that receives the lower surface of the disc 14, and a cylindrical part 13b having a diameter slightly smaller than the central hole of the disc 14, and the cylindrical part 13b has a thickness slightly lower than that of the disc 14. It is formed. 15a, 15b, 15c are weight bodies having notched arc surfaces 15a', 15b', 15c' on the outer periphery of the bottom; 16a, 16b, 16c are the weight bodies 15;
a, 15b, and 15c are support arms made of elastic bodies such as arc-shaped leaf springs attached to the tips;
Cylindrical support fittings 17a, 17b, 1 at the other end
It has 7c. Support shafts 18a, 18b, and 18c are fitted into the support fittings 17a, 17b, and 17c to rotatably support the support arms 16a, 16b, and 16c near the outer periphery of the upper surface of the cylindrical portion 13b of the turntable 13. It is mounted parallel to the axis of the turntable 13. Reference numeral 19 indicates an engagement shaft provided at the axis of the turntable 13, and reference numerals 20a, 20b, and 20c indicate tension springs installed between the engagement shaft 19 and the weight bodies 15a, 15b, and 15c. Support arm 16
a, 16b, 16c and weight bodies 15a, 15b, 15c provided at their ends are elastically biased so as to be drawn into the radial inside of the cylindrical portion 13b of the turntable 13.

In the disk mounting device having such a configuration, when the rotation of the turntable 13 is stopped, the support arms 16a, 16b, 16c rotatably supported by the support shafts 18a, 18b, 18c and the support arms 16a, 16b, 16c are rotated. The weight bodies 15a, 15b, 15c provided at the tips of the arms 16a, 16b, 16c are drawn into the radial inside of the cylindrical portion 13b of the turntable 13 by the biasing force of the tension springs 20a, 20b, 20c, The central hole of the disc 14 is inserted into the cylindrical part of the turntable 13 to facilitate the mounting operation of the disc 14 held therein. On the other hand, when the turntable 13 rotates in the direction of arrow A in the state in which the disk 14 is attached to the turntable 13, the support arms 16a, 16b, 16c and the weight body 15
Centrifugal force acts on the supporting arms 16a, 15c, and when the centrifugal force overcomes the biasing force of the tension springs 20a, 20b, 20c, the support arms 16a, 1
6b and 16c are subjected to a force that tends to spread outside the diameter of the cylindrical portion 13b of the turntable 13 due to the centrifugal force. Then, the support arms 16a, 16
Weight bodies 15a, 15b provided at the tips of b, 16c,
15c has notched arc surfaces 15a', 15 at their bottoms.
b', 15c' are provided, so the above disk 14
Climb onto the edge of the central hole of the supporting arm 1.
6a, 16b, 16c are the weight bodies 15a, 15
b, 15c will bend in accordance with the amount of riding on the disk 14. And the support arm 1
The reaction force caused by the bending of the disks 6a, 16b, and 16c acts as a force that presses the disk 14 against the flat portion 13a of the turntable 13, thereby firmly fixing the disk 14 to the turntable 13. As the rotation speed of the turntable 13 increases, the weight bodies 15a, 15b, 1
A large centrifugal force acts on the weight bodies 15a, 5c, and
15b and 15c further spread outward and ride on the central edge of the disk 14 by a large amount, pressing the disk 14 with a strong pressing force.
When the rotation of the turntable 13 is stopped,
The support arms 16a, 16b, 16c return to their original positions due to the urging force of the tension springs 20a, 20b, 20c, making it easier to remove the disk 14 from the turntable 13.

In the above embodiment, a support arm having a weight at its tip is rotatably supported on the upper surface of the cylindrical portion 13b of the turntable 13, and elastically biased to draw the weight into the diameter of the cylindrical portion. However, the supporting arm having the weight body and being elastically biased is rotatably supported by a cylindrical part provided so as to protrude from the center of the turntable 13.
The weight body and the support arm may move in and out through a see-through window provided on the same surface of the cylindrical part in response to the rotation of the cylinder part. In this case, the weight body may be supported such that its bottom surface becomes slightly smaller between the flat surface of the turntable 13 and the thickness of the disk.

As described above, according to the present invention, the other ends of the plurality of support arms made of an elastic body provided with a weight at the tip are rotatably attached within the diameter of the central protrusion of the turntable, and the other ends of the plurality of support arms are Since each of them is elastically biased to be drawn into the diameter of the central protrusion of the turntable, the weight body and the support arm protrude outside the diameter of the central protrusion of the turntable when the turntable is at rest. There's nothing to do,
The disk can be easily attached to and detached from the turntable. Further, since the bottom of the weight body has an inclined surface that expands outward, the centrifugal force applied to the weight body as the turntable rotates causes the weight body to move toward the edge of the central hole of the disk. According to the amount by which the weight body rides on the disk, the reaction force generated by the deflection of the supporting arm can be used to hold down the disk and securely attach the disk.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional disk mounting device, FIG. 2 is a plan view showing an embodiment of the disk mounting device of the present invention, and FIG. 3 is a front view showing a portion thereof in section. 13... Turntable, 14... Disc 1
5a, 15b, 15c...pyramid, 16a, 16
b, 16c...support arm, 17a, 17b, 17c
...Support tool, 18a, 18b, 18c...Support shaft, 19...Engagement shaft, 20a, 20b, 20c...
...Tension spring.

Claims (1)

[Scope of utility model registration request] Each of the plurality of support arms rotatably supported within the diameter of the central protrusion of the turntable is elastically biased to be drawn into the diameter of the central protrusion of the turntable, and the tips of the plurality of support arms are A disk mounted on the turntable, wherein a weight body having an inclined surface expanding outwardly is attached to the bottom thereof, and the bottom surface of the weight body is disposed between a flat part extending around the outer periphery of the central protrusion of the turntable. A disk mounting device configured to form a gap slightly smaller than the thickness of the disc.