JPH07153156A - Disk chucking mechanism - Google Patents

Abstract

PURPOSE:To surely clamp a disk to a turntable. CONSTITUTION:A yoke plate 14 held by a supporting plate 19 is formed in an approximately U-shape in its cross section, and an annular magnet 18 is fitted close to the inner side of the yoke plate 14. Then, the disk on the turntable 1 is held between the yoke plate 14 with a chucking disk 8 and the turntable 1 by attraction force between an annular iron plate 5 provided in the turntable 1 and the yoke plate 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk chucking mechanism such as a CD-ROM, and more particularly to a disk chucking mechanism for securely holding a disk by increasing the attractive force of a magnet.

[0002]

2. Description of the Related Art One of the conventional chucking mechanisms for discs
First, there is a chucking mechanism using a magnet system,
For example, as shown in FIG. 4, at the center of the upper surface of the turntable 101, a cylindrical protrusion 103 for fitting into the center hole 102a of the disc-shaped disc 102 is provided integrally with the turntable 101. The tip of 103 is formed in a tapered shape. Furthermore, the ring-shaped iron plate 104
It is provided on the turntable 101 outside the protrusion 103. In addition, a hole 106 that fits into the rotary shaft 105a of the motor 105 is provided at the center of the turntable 101, and the rotary shaft 105a of the motor is fitted into this hole 106 to rotate the turntable 101. .

A mechanism for chucking the disc on the turntable 101 is provided above the turntable 101. This mechanism includes a support plate 113 for supporting the mechanism, a chuck disc 107 provided so as to sandwich the support plate 113, a yoke plate 115 attached to the chuck disc, and the chuck disc 107 and the yoke plate 115. It is composed of a ring-shaped magnet 109 provided therebetween.

This mechanism will be described in more detail. The protrusions 108, 108a are formed on the upper surface of the substantially disk-shaped chuck disk 107.
A groove 110 having a shape that engages with the ring-shaped magnet 109 is provided between the protrusions 108 and 108 a, and the ring-shaped magnet 109 is fixed to the groove 110.
Further, on the lower surface of the chuck disk 107, a groove 111 that engages with the protrusion 103 provided on the turntable 101 is formed.
Is provided, and the rotation shaft 105a of the motor 105 is attached to the center of the lower surface of the chuck disk 107.
A tapered concave portion 112 that guides the center of the concave portion is provided.

A support plate 11 is provided above the turntable 101.
3, the turntable 101 is provided on the support plate 113.
A circular through hole 114 having an outer diameter smaller than the outer diameter of the chuck disk 107 is provided at a position facing the upper surface. Then, the protrusion 108 provided on the chuck disk 107 is passed through the through hole 114, and
Disk-shaped yoke plate 11 having an outer diameter larger than that of
A protrusion 1 in which 5 is formed in the center of the chuck disk 107.
The chuck disk 1 is fixed by being fixed to the upper end of 08.
07 and the yoke plate 115 are the through holes 114 of the support plate 113.
The chuck disc 107 is hooked around the periphery of the support plate 11
It is supported so that it hangs at 3.

In the conventional disk chucking mechanism thus constructed, the disk 102 is turned by the turntable 10.
When mounted on No. 1, the disc 102 is a tray (not shown) between the turntable 101 and the chuck disc 107.
After being positioned by, the turntable 101, the motor 105, etc. are vertically lifted, the cylindrical projection 103 provided on the turntable 101 is inserted into the center hole 102a of the disc 102, and the turntable 101 and the motor 105 are provided on the chuck disc 107. The magnet 109 and the ring-shaped iron plate 104 provided on the turntable 101 magnetically attract each other to chuck the disk 102.

[0007]

However, in the above-mentioned prior art, since the disc and the chuck disc are interposed between the magnet and the ring-shaped iron plate, the chucking force is insufficient, and the chuck disc comes off due to a slight vibration. However, there are drawbacks such that the rotation of the disc is not stable due to the deviation or displacement, the signal recorded on the disc cannot be read, and the disc comes into contact with a pickup device or the like to be damaged.

Therefore, the present invention has been made in order to solve the above-mentioned drawbacks, and provides a chucking mechanism for a disk, which securely holds the disk between a turntable and a chuck disk and stably rotates the disk. The purpose is to do.

[0009]

In order to achieve the above object, the present invention provides a turntable on which a disc is mounted, a ring-shaped iron plate provided on the turntable, and a turntable supported on the turntable. It is characterized in that it is composed of a yoke plate having a substantially U-shaped cross section and a magnet fixed to the yoke plate, and the yoke plate is configured to directly contact the disk.

[0010]

According to the present invention constructed as described above, since the yoke plate is formed in a substantially U-shaped cross section and the magnet is fixed to the yoke plate, the magnetic force lines are concentrated on the peripheral edge of the opening of the yoke plate.
The yoke plate and the ring-shaped iron plate provided on the turntable magnetically attract each other. Therefore, the peripheral edge of the opening of the yoke plate contacts the disc placed on the turntable, and the yoke plate and the chuck disc fix the disc on the turntable.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. At the center of the upper surface of the turntable 1, a cylindrical projection 3 for fitting into the central hole 2a of the disk 2 is provided integrally with the turntable 1, and the tip of the projection 3 is tapered. Has been done. Furthermore, an annular groove 4 is provided along the cylindrical protrusion 3, and a ring-shaped iron plate 5 is fixed to this groove 4.

A hole 7 is provided at the center of the turntable 1 so as to fit with the rotary shaft 6a of the motor 6, and this hole 7 is provided.
Further, the turntable 1 is fixed to the rotary shaft 6a by fitting and projecting the rotary shaft 6a to a height substantially equal to that of the protrusion 3 on the upper surface of the turntable 1.

A mechanism for chucking the disk 2 on the turntable 1 is provided above the turntable 1. Then, this mechanism includes a support plate 19 for supporting the mechanism, a yoke plate 14 mounted so as to hang on the support plate 19, a chuck disk 8 fixed to the yoke plate 14 with screws 21, and a chuck disk. 8 and a ring-shaped magnet 18 fixed between the yoke plate 14.

To further explain this mechanism in detail, an annular groove 9 for engaging with the protrusion 3 on the upper surface of the turntable 1 is provided on the lower surface of the central portion of the chuck disk 8, and the protrusion 10 inside the groove 9 is provided. A tapered concave portion 11 for guiding the rotating shaft 6a of the motor 6 to the center of the chuck disk 8 is provided at the tip of the. A hole 12 that engages with the rotary shaft 6a of the motor 6 is provided at the center of the chuck disk 8, and a plurality of hook portions 13 (three in this embodiment) are radially provided on the outer circumference toward the outside. It is projected. In addition, the yoke plate 14
Has a substantially U-shaped cross section (so-called bowl shape), and the yoke plate 1
The magnetic force lines concentrate on the periphery of the opening of No. 4 and act as the magnetic pole piece 14a. The magnetic disk 14a has a chuck disk 8
Notch 1 having a shape that engages with a hook 13 provided on the
7 is provided corresponding to the plurality of hook portions 13, and a plurality of hooks 16 are formed. The hooks 16 are also provided to project radially outward. Furthermore, the yoke plate 1
4 is a ring-shaped magnet 18 between the chuck 4 and the chuck disk 8.
Is attached, and the magnet 18 is in contact with the center of the yoke plate 14.

A support plate 19 is provided above the turntable 1, and a circular through hole having an outer diameter larger than the outer diameter of the yoke plate 14 is provided on the support plate 19 at a position facing the upper surface of the turntable 1. 20 are provided. Support plate 19
The yoke plate 14 and the chuck disk 8 are fixed with screws 21 so that the support plate 19 is sandwiched between the hook 16 and the hooking portion 13 abutted on the chuck disk 8.
Is located. Therefore, the hook 16 provided on the yoke plate 14 is hooked on the support plate 19, and the chuck disk 8 is supported so as to hang from the support plate 19.

When the disc 2 is placed on the turntable 1, the turntable 1, the motor 6 and the like rise vertically, the cylindrical projection 3 of the turntable 1 is inserted into the center hole 2a of the disc 2, In addition, the rotating shaft 6a of the motor 6 is formed by the recess 11 provided on the lower surface of the chuck disk 8.
Is reliably guided to the center of the chuck disk 8, and the centers of the disk 2, the turntable 1 and the chuck disk 8 coincide with the axis of the rotating shaft 6a, and the pole piece 14a of the yoke plate 14, the chuck disk 8 and the turntable. The disc 2 is securely clamped by 1 and. At this time, since there is no chuck disc between the magnetic pole piece 14a of the yoke plate 14 and the iron plate 5, the disc 2 is securely fixed on the turntable 1. Further, the chucking portion 13 provided on the outer circumference of the chuck disk 8 prevents the chuck disk 8 from coming out above the support plate 19.

[0017]

As described in detail above, according to the present invention, since the yoke plate is formed in a substantially U-shaped cross section, the magnetic force lines are concentrated on the peripheral edge of the opening of the yoke plate and the yoke plate directly contacts the disk. , The magnetic attraction between the yoke plate and the ring-shaped iron plate provided on the turntable increases. Therefore, the disc is a yoke plate and a chuck disc,
It is securely sandwiched with the turntable. Therefore, it is possible to prevent the chuck disc from being dislocated or displaced due to vibration and the like, and the disc can be stably rotated. Therefore, it is possible to prevent damage or damage to the disc or the pickup device. Further, it becomes possible to perform stable recording and reproduction.

[Brief description of drawings]

FIG. 1 is an exploded sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the above embodiment.

FIG. 3 is a schematic plan view of the above embodiment.

FIG. 4 is a schematic sectional view showing a conventional disk chucking mechanism.

[Explanation of symbols]

 1 turntable 2 disc 5 iron plate 8 chuck disc 14 yoke plate 14a magnetic pole piece 18 magnet

Claims (1)

[Claims] 1. A turntable on which a disc is mounted,
A ring-shaped iron plate provided on the turntable, a yoke plate having a substantially U-shaped cross section, and a magnet fixed to the yoke plate, and the yoke plate is configured to directly contact the disk. Characteristic disk chucking mechanism.