JP2592402Y2 - Optical disk drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device having an improved optical disk clamping mechanism.

[0002]

2. Description of the Related Art FIG . 6 shows a conventional optical disk device. In the figure, a spindle motor 103 is attached to a chassis 102 arranged in a housing 101 of the optical disk device. A turntable 104 for loading the optical disc D is attached to the end of the rotating shaft of the motor 103.
On this upper surface, a clamp member 107 attached to a housing upper portion 108 is arranged. An optical head 105 is moved by a moving means (not shown).

In operation, an optical disk D is loaded on a turntable 104, and the loaded optical disk D
The clamp member 107 descends from above with the movement of the housing upper surface 108. Then, the optical disk D is chucked in the optical disk device by the chucking operation of the clamp member 107.

However, in such a conventional optical disk apparatus, the clamp member 107 pushes the optical disk D from above, and as a result, a load is applied to the spindle motor 103 via its rotating shaft.

Further, in such an apparatus, a separate member for chucking (conventionally, the clamp member 107) is required, so that the number of components is increased, and another member is required on the upper surface of the optical disk D. Therefore, the thickness of the device is required, and it has been difficult to realize a small and thin device.

Further, since chucking is performed in a state of being connected to the upper surface 108 of the housing as described above, vibrations applied to the apparatus are directly applied to the optical disk D, and in an optical disk apparatus that needs to be rotated with high precision, This was causing a major problem in the reliability of the product.

[0007] As means for solving these problems, there is Japanese Patent Application Laid-Open No. Hei 3-157859. Diagram of this
FIG . In this case, a chuck member 100 is disposed at the tip of a spindle motor 103. This chuck member 1
00 is an O-ring 120 made of an elastic material
0, and the clamp ball 130 is projected from the opening 140 of the cone 110. The three balls 103 are equally spaced around the circumference of the cone 110, the upper surface of which is pressed by the upper surface 111 of the cone 110, and the lower surface of which is pressed by the stopper 160. The sphere 130 does not fall out of the opening 140 of the cone 110 normally because more than a hemisphere is in the cone 110.

Next, as a chucking operation, the cone 11 of the chuck member 100 is inserted into the center hole 150 of the optical disk D.
0, the clamp ball 130 is pushed into the cone 110 by the inner peripheral surface of the center hole 150 against the pressing of the O-ring 120, and the optical disc D is loaded on the turntable 104. Ring 12
The optical disk D protrudes from the opening 140 due to the zero reaction force.
With the turntable 104.

As a result, the apparatus can be made thinner and the motor 1 can be made thinner.
The load on 03 goes away.

However, in this device, chucking is performed using the elastic force of the O-ring 120, and a chucking loss due to a decrease in the elastic force is inevitable. That is, in the portion where the ball 130 of the O-ring 120 hits, the ball 1 is always
Since the stress from 30 is applied, the elastic force decreases rapidly with time, and the chucking by the ball 130 cannot be maintained.

[0011]

According to the above-mentioned prior art, an optical disk device which is thin and lightweight can be constructed. However, since an elastic body such as an O-ring 120 is used, a force is always applied to the elastic body. However, a sudden decrease in elastic force is inevitable, and there is a problem in the reliability of the device, particularly in an optical disk device that is considered to be portable.

Accordingly, the present invention provides an optical disk device that realizes a smaller and thinner device and has higher reliability as a device.

[0013]

According to the present invention, there is provided an optical disk having a center hole.
A turntable rotatably driven by receiving rotational power, an insertion portion provided at a center portion of the turntable, for inserting and removing a center hole of the disc, and a coaxially same diameter as the center hole of the optical disc in the insertion portion. A plurality of spherical members held so as to be able to advance and retreat in the radial direction across the virtual cylindrical region, and provided in the insertion portion or the turntable, for urging the respective spherical members outward, and a central hole of the optical disk. When the optical disk is inserted into the insertion portion, the spherical members are allowed to retreat into the virtual cylindrical region, and a part of each of the spherical members until the optical disc is placed on the turntable. And a magnetic attraction means for advancing the optical disk out of the virtual cylindrical region to clamp the optical disk.

The present invention is characterized in that the insertion portion has an inverted bottomed cylindrical shape having a diameter slightly smaller than that of the virtual cylindrical region, and has an opening through which a part of each of the spherical members advances and retreats. Things.

Further, according to the present invention, the magnetic attraction means has a magnet fixed in the insertion portion or the turntable, and an inclined portion abutting on a peripheral surface of the spherical member. And a magnetic piece which is provided so as to be displaceable and is urged by the magnet to urge the spherical member outward.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.
This will be described with reference to FIG . FIG. 1 is a partial cross-sectional view showing an embodiment of the optical disk device of the present invention, FIG. 2 is a longitudinal sectional view of a main part of the optical disk device shown in FIG. 1, and FIG. 3 is a top view of the optical disk device shown in FIG. FIG. 4 is a side view of the optical disk device shown in FIG.

In FIG. 1, a chucking member 1 is disposed at the tip of a spindle motor shaft 3 attached to a chassis 102. On the upper surface of the turntable 4, a cone 6 as an insertion portion having a partial opening 14 is attached. This attachment is performed by mutually locking a first key portion 14 formed inside the turntable 4 and a second key portion 16 formed on the cone 6.

A clamping ball 5 is disposed inside the cone 6 as a spherical member for chucking, and a portion of the clamping ball 5 inside the cone 6 is pressed by the magnetic piece 11. The magnetic piece 11 is made of a magnetic material such as iron and the magnet 1 disposed inside the turntable 4.
0 sucks down. This suction force becomes a force for pushing the clamp ball 5 outward.

FIG. 2 shows the state in detail. That is, when the magnetic piece 11 is attracted by the magnet 10, the resultant force (vector sum) f of the force F 1 from the magnetic piece 11 and the reaction force F 2 from the upper part of the first key portion 14 is applied to the cone 6 by the clamp ball 5. This occurs as a sudden output from

It should be noted that the clamp ball 5 is
Are arranged at equal intervals, and a part of each is
As shown in FIG. That is, the clamp sphere 5 is held in the cone 6 so as to be able to advance and retreat in the radial direction across a virtual cylindrical region having the same diameter as the center hole 15 of the optical disc D in the cone 6.
When the magnet 10 for urging the outer side of the optical disc D causes the center hole 15 of the optical disc D to pass through the cone 6, the clamp ball 5
Of the optical disk D.
Until the optical disc D is mounted on the turntable 4, a part of each clamp ball 5 is advanced out of the virtual cylindrical region.
Acts as a clamp.

More specifically, the clamping operation is started by first inserting the cone 6 in the chucking member 1 into the center hole 15 of the disk D. At this time, the center hole 15
The inner peripheral edge pushes the clamp ball 5 into the cone 6 against the resultant force f, and the optical disc D is placed on the turntable 4 while pushing the clamp ball 5 inward. In the mounted state, as shown in FIG. 4, the clamp ball 5 protrudes from the opening 14 by the resultant force f, and holds the disk D together with the turntable 4.

A second embodiment of the present invention will be described with reference to a partial longitudinal sectional view shown in FIG. The same parts as those in the previous embodiment are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the magnet 10 ′ is arranged not in the turntable 4 but in the cone 6, and the magnetic piece 11 ′ has a shape having an inclined portion whose upper surface guides the clamp ball 5.

This makes the turntable 4 thinner, which is effective when the turntable 4 cannot be enlarged.

[0024]

[Effects of the Invention] As described above, according to the present invention,
Several spheres are inserted in the insertion part for inserting and removing the center hole of the optical disc.
Each virtual member has the same diameter as the center hole of the optical disk.
Holds the cylinder area so that it can advance and retreat in the radial direction, and
Or, the magnetic attraction means provided in the turntable
Push the member outward and insert the center hole of the optical disc into the insertion section.
When retracted, each spherical member retracts into the virtual cylinder area
Optical disc is placed on the turntable
A part of each spherical member is moved out of the virtual cylinder region by
The optical disk is clamped by
The force for clamping the disc is the pressing force of the multiple spherical members.
That is, based on the magnetic force of the magnetic attraction means acting on the spherical member
Force, and strongly presses the optical disc.
No excessive drive load is applied to the
Magnetic force, the source of lamp power, is a clan that uses an O-ring.
Suddenly low clamping force due to material deterioration
Can be maintained semi-permanently without lowering
Spherical part that moves in the radial direction within the insertion part
Because part of the material clamps the optical disc,
Like a conventional device where the clamp material presses from above
There is no increase in size in the vertical direction, making the device thinner
Alternatively, it is easy to reduce the size, and vibrations acting on the
Since the movement does not directly affect the optical disc,
That can be driven in a good rotating environment.
The effect is excellent.

Further , the insertion portion is slightly smaller than the virtual cylindrical region.
It has a small diameter inverted bottomed cylindrical shape, and a part of each spherical member moves forward and backward.
A virtual circle with the same diameter as the inner diameter of the optical disk
The optical disk clamp has a space with almost the same capacity as the cylinder area.
To promote thinning and miniaturization of equipment.
And the like.

Further, the magnetic attraction means has a magnet fixed in the insertion portion or the turntable, and an inclined portion in contact with the peripheral surface of the spherical member, and is provided in the insertion portion so as to be axially displaceable. The inclined portion of the magnetic piece guides the spherical member in the radial direction of the optical disk to include the magnetic piece that is sucked and urges the spherical member outward, thereby assuring smooth movement of the spherical member. Thus, the magnetic force of the magnet can be effectively utilized as the displacement resistance of the magnetic piece for clamping the optical disk, and the like.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing one embodiment of an optical disk device of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the optical disk device shown in FIG.

FIG. 3 is a top view of the optical disk device shown in FIG.

FIG. 4 is a side view of the optical disk device shown in FIG.

FIG. 5 is a partial longitudinal sectional view showing another embodiment of the optical disk device of the present invention.

FIG. 6 is a side view showing an example of a conventional optical disk device.
You.

FIG. 7 is a partial vertical view showing another example of a conventional optical disk device .
It is sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chucking member 4 Turntable 5 Clamp ball 6 Cone 10 Magnet 11 Magnetic piece 15 Center hole D Optical disk

Claims (3)

(57) [Scope of request for utility model registration] 1. An optical disk having a center hole is placed thereon,
A turntable rotatably driven by receiving rotational power, an insertion portion provided at a center portion of the turntable, for inserting and removing a center hole of the optical disc, and a coaxially same diameter as the center hole of the optical disc in the insertion portion. A plurality of spherical members held so as to be able to advance and retreat in the radial direction across the virtual cylindrical region, and provided in the insertion portion or the turntable, for urging the respective spherical members outward, and a central hole of the optical disk. When the optical disk is inserted into the insertion portion, the spherical members are allowed to retreat into the virtual cylindrical region, and a part of each of the spherical members until the optical disc is placed on the turntable. An optical disk device comprising: magnetic attraction means for advancing the optical disk outside the virtual cylindrical region to clamp the optical disk. 2. The insertion part has an inverted bottomed cylindrical shape having a diameter slightly smaller than that of the virtual cylindrical region, and has an opening through which a part of each of the spherical members advances and retreats. Optical disk device. 3. The magnetic attraction means has a magnet fixed in the insertion portion or the turntable, and an inclined portion abutting on a peripheral surface of the spherical member, and can be displaced in the insertion portion in the axial direction. 2. The optical disk device according to claim 1, further comprising: a magnetic piece provided to urge the spherical member outward by being attracted by the magnet.