JPH10177756A - Disk tray for disk carriage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a whizzing sound generated at the time of rotating a disk by forming a disk mounting part with a declivous part on the decline from the center side to the outer peripheral side of a disk tray. SOLUTION: This disk tray A is formed with disk mounting parts 1-4 over several steps on the upper surface to correspond to compact disks of 8cm for audio, 12cm for video and audio, 20cm and 30cm for video in diameter respectively. Then, a conical tapered surface 5 is formed to be gently declined from this mounting part 4 over to the outer periphery. Consequently, after setting the large diameter disks of 20cm and 30cm in diameter on a turntable by the disk tray, a gap between the large diameter disk and the disk tray A is increased in proportion to approaching the outer periphery. Therefore, the whizzing sound generated in accordance with its position nearer to the outer periphery is reduced as an air flowing speed on the surface of the disk tray is weakened in accordance with a distance between the disk and the tray increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compact disc for audio having a diameter of 8 cm, an audio compact disc having a diameter of 12 cm,
Compact disc for video, diameter 20cm, 30cm
The present invention relates to an improvement in a disk tray used for a transfer device for transferring a video disk from a disk mounting position to a turntable, and for transferring the disk to a position where the disk is mounted and set on the turntable.

[0002]

2. Description of the Related Art Conventionally, the upper surface of a disk tray of this type of disk transport device is formed as a whole so that disks of various sizes described above can be placed thereon. And after putting the disc on the turntable,
The mounting surface stands by at a position slightly lower than the turntable.

[0003]

The disk set on the turntable as described above rotates to reproduce the recording, but as the disk rotates, the air on the surface in contact with the disk also moves in the same direction as the rotation of the disk. Start flowing.
Then, since there is a disk tray near the lower surface of the disk, air flows on the disk tray,
There is a disadvantage that wind noise is generated. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem of the disk tray of the conventional disk transport device, and has an object to reduce the wind noise generated in the disk tray by increasing the gap between the disk and the tray. . In particular, the present invention pays attention to the fact that the linear velocity of rotation of the disk surface increases as it reaches the outer periphery of the disk having a large diameter, and therefore the velocity of the air flow increases as the outer circumference increases. An object of the present invention is to reduce the wind noise generated in the disk tray on the outer peripheral side by forming a descending portion that descends from the outer side to the outer peripheral side.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a disk tray of a disk transport device for achieving the above-mentioned object, and includes a small-diameter disk mounting portion for mounting a small-diameter disk, and a small-diameter disk mounting portion. A large-diameter disk mounting portion for mounting a large-diameter disk formed with a step around the lower surface, and a large-diameter disk mounting portion having a descending portion descending from the center side of the disk tray to the outer peripheral side. It is characterized by.

[0005]

The disc tray of the disc transport device of the present invention has a descending portion in which the gap between the disc and the tray is large, and in particular, the outer periphery descends from the center to the outer periphery of the disc tray on which the large-diameter disc is placed. After the disk tray sets the large-diameter disk on the turntable, the gap between the large-diameter disk and the disk tray is
It increases as it reaches the outer circumference. However, the air flow on the disk surface becomes faster toward the outer periphery, but becomes slower as the air flow becomes farther from the disk surface. Therefore, the velocity of the air flow on the disk tray surface is reduced as the distance between the two increases, so that the wind noise can be reduced in the outer peripheral portion where the loud wind noise is generated.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings. The tray A has a mounting portion 1 for a compact disk for audio having a diameter of 8 cm, a mounting portion 2 for a compact disk for video and audio having a diameter of 12 cm, a mounting portion 3 for a video disk having a diameter of 20 cm, A disc mounting portion 4 of a 30 cm video disc is formed on the upper surface over several steps. The mounting portion 4 is formed on a gentle conical tapered surface 5 which descends toward the outer periphery.

The tray A is placed on a turntable from a mounting position on which the above-mentioned disks of various sizes are mounted by a transport means called a disk loading device which is conventionally known. After being conveyed to the set position, it is lowered to a position below the upper surface of the turntable and waits. Therefore, the gap between the lower surface of the disk set on the turntable and the tray A increases from the mounting portion 4 to the outer periphery.

When the disk is sandwiched between the turntable and the clamper and rotated by the rotation of the turntable, a layer of air in contact with the turntable flows according to the rotation of the turntable.

The velocity of the air flow increases as the linear velocity of the disk increases toward the outer periphery of the disk, but decreases as the distance from the disk increases due to the resistance between the air layers.

Therefore, when the air flow on the outer peripheral portion hits the tray A, the speed of the air flow becomes slower than that of the case where the distance between the tray A and the disk is equal, and the wind noise is reduced more than in this case. Can be done.

[0011]

As described above, according to the present invention, the wind noise caused by the rotation of the large-diameter disk can be reduced by only slightly changing the shape of the disk tray. Further, since the small-diameter disk mounting portion and the large-diameter disk mounting portion are formed with a step, the contact area between the large-diameter disk and the tray is reduced, and the possibility that the disk surface is damaged is reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the present invention.

FIG. 2 is a plan view of one embodiment of the present invention.

[Explanation of symbols]

 A: Disc tray 4: Mounting part 5: Tapered surface

Claims (1)

[Claims] 1. A disk which is not deformed by an air flow generated when the disk is rotated while the disk is mounted on the turntable, is transported to the turntable, and after the disk is mounted on the turntable. A disk tray of a disk transport device positioned at a position separated from a disk, comprising: a small-diameter disk mounting portion for mounting a small-diameter disk; and a large-diameter disk formed with a step around the small-diameter disk mounting portion. A large-diameter disk mounting portion for mounting the disk tray, wherein the large-diameter disk mounting portion is formed with a descending portion descending from a center side of the disk tray to an outer peripheral side.