JPH08339597A - Disk clamp device - Google Patents

Abstract

PURPOSE: To make a disk clamp mechanism simple and thin and also inexpensive by clamping an optical disk utilizing magnetic flux of a spindle magnet passed through a magnetic flux through hole. CONSTITUTION: A rotary shaft 19 fixed to a turntable(TT) 19 having plural through holes 20 is freely rotatably held by a bearing part fixed onto a base 1, and moreover, the spindle magnet(SM) 8 is bonded to a lower part of the TT 19 opposite to a spindle coil 2 bonded onto the base 1, so as to form a spindle motor. The optical disk(OD) 5 is placed on the TT 19, and a clamper plate(CP) 21 of a magnetic substance is fitted on the OD 5. The OD 5 attracted by the arrival of magnetic force of the SM 8 via the through holes 20 is clamped by the CP 21. Thereby, the disk clamp mechanism can be simplified, made thin and reduced in cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc clamp device, and more particularly to a disc clamp device for holding an optical disc in an optical disc recording / reproducing apparatus having a spindle motor for rotationally driving an optical disc which is a recording medium.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for an optical disk recording / reproducing apparatus for recording or reproducing information using an optical disk as a recording medium.

The optical disk recording / reproducing apparatus is provided with a disk clamp mechanism for holding the optical disk so that the motor rotates the optical disk.

(First Conventional Example) FIG. 5 is a sectional view of a disk drive portion having a disk clamp mechanism using a conventional magnet.

A conventional disk drive unit is composed of a base 1 made of a thin resin plate and a spindle coil 2 adhered onto the base 1.
Power supply wiring (not shown) is provided for connecting the spindle coil 2 to an external power supply.

The spindle coil 2 is formed by winding a copper wire, and a plurality of spindle coils 2 are arranged on the circumference of an imaginary circle having a predetermined radius on the base 1. In this case, the spindle coil 2 is thinned in the vertical direction (rotational axis direction) to reduce the thickness of the disk drive unit, and thus the optical disk recording / reproducing apparatus.

As the shape of the spindle coil 2 seen from the upper side of the drawing, there are various shapes such as a triangle and a square that have been devised in order to improve the rotational driving force. As for the arrangement of the spindle coil 2 on the base 1, there is also one arranged only on the semicircle side of a circle having a predetermined radius.

At the center of a virtual circle on the base 1 on which the spindle coil 2 is arranged, a bearing portion 4 made of metal or a material having a similar strength is press-fitted onto the base 1. A rotary shaft 3 made of metal or a material having a strength equivalent to that of metal is rotatably inserted into the portion 4 perpendicularly to the base 1.

A circular turntable 6 is fitted on the rotary shaft 3, and a projection 6A for guiding the holding hole provided in the optical disk 5 to the center of rotation is provided on the turntable 6.

On the upper portion of the projection 6A, a disk clamp magnet 7 magnetized so as to generate a magnetic flux in the vertical direction (vertical direction in the drawing) is bonded.

A spindle magnet 8 is bonded to the lower surface of the turntable 6 so as to face the spindle coil 2.

The spindle magnet 8 has a ring shape whose rotation center coincides with that of the turntable 6,
It is magnetized so as to generate a magnetic flux in the vertical direction so that the magnetic flux is incident on the spindle coil 2.

A circular clamper plate 10 for holding the optical disk 5 is attached to the housing 9 via a clamper attaching member 12 so as to be vertically and horizontally movable and rotatably attached, and the center of the circular clamper plate 10 is attached. A magnetic plate 11 is fixed on the shaft.

In this case, the clamper plate 10
Since the diameter of the flange portion is larger than the diameter of the opening of the clamper mounting member 12, the clamper plate 10 will not come off.

The magnetic plate 11 has a size within the outer diameter of the protrusion 6A on the turntable 6 and is formed of any material as long as it is attracted by the magnetic force of the disc clamping magnet 7. The material does not matter.

The holding operation of the optical disk 5 will be described here. Clamper plate 10 and magnetic plate 11
On the side where the optical disk 5 is mounted, a concave shape that matches the shape of the convex portion formed by the projection 6A protruding from the holding hole 5A of the optical disk 5 when the optical disk 5 is mounted on the turntable 6. Is doing. This allows
The clamper plate 10 has a structure that physically and magnetically contacts the optical disk 5, and the magnetic plate 11 physically and magnetically contacts the disk clamping magnet 7.

With the above configuration, the optical disk 5 is held by sandwiching the optical disk 5 with the turntable 6 and the clamper plate 10 by the attractive force based on the magnetic force generated between the disk clamping magnet 7 and the magnetic plate 11. .

Further, there is a clamper plate 10 to which an anti-slip sheet 13 is attached which plays a role of preventing slippage in the rotation direction of the optical disk 5 and protecting it from damage.

(Second Conventional Example) Next, a ball bearing and an O
FIG. 6 shows a sectional view of a disc clamp mechanism using a combination of rings. A perspective view of the turntable portion is shown in FIG.

Inside the upper protrusion of the turntable 14,
An O-ring 15 is enclosed in a concentric circle centered on the rotation center of the turntable 14. The O-ring 15 is made of a resin having elasticity.

In order to prevent the O-ring 15 from falling off the turntable 14, a ring-shaped O-ring holding plate 16 is provided.
Is fitted in a ring-shaped groove at the bottom of the turntable 14.

A metal ball bearing 17 is sandwiched between the turntable 14 and the O-ring 15.

When viewed from the upper surface of the turntable 14 (upper side of the drawing), the ball bearings 17 are arranged so as to evenly divide the central angle at a uniform distance from the center of the turntable 14, and usually 120 degrees. 3 at angular intervals of
One used. However, the number of the optical disks does not matter as long as the holding / fixing force is evenly applied to the optical disks.

Ball bearing 17 and turntable 1
4, a hole 18 slightly smaller than the diameter of the ball bearing 17 is provided in the turntable 14, and a part of the ball bearing 17 is provided in the turntable 1.
It is exposed to the outside of the upper protruding portion of No. 4.

Turntable 1 of ball bearing 17
The outer exposed portion of the upper protrusion 4 can be pushed inward by applying a force to the ball bearing 17 from the outside, and when the application of force is stopped, the O ring 15 returns to its original state. I'm supposed to come back.

Here, the holding operation of the optical disk will be described. In order to hold the optical disk 5, the optical disk 5
The holding hole 5A is pressed against the exposed portion of the upper portion of the turntable 14 of the ball bearing 17, and is brought into contact with the upper surface (disc contact surface) of the turntable 14.

The optical disk 5 is the turntable 14
The ball bearing 17 tries to return to the original state by the elastic force of the O-ring 15 when it comes into contact with the upper surface of the.

As a result, the ball bearing 17 comes into contact with the upper portion of the holding hole 5A of the optical disk 5, and the turntable 1
A force for pressing the optical disc 5 against the optical disc 4 is generated, and the optical disc 5 is held.

[0029]

However, in the disk clamping mechanism using the magnet of the first conventional example, there are two parts for driving the turntable and for holding the optical disk.
Since it is necessary to use two magnets, the clamp portion becomes thick, it is difficult to make the optical disc device thin, and the number of parts increases, so that there is a problem that the cost increases.

Further, the disk clamping mechanism using the ball bearing and the O-ring of the second conventional example has the problems that the holding force of the optical disk changes due to aging of the O-ring, warpage of the optical disk occurs, and the structure becomes complicated. It was

Therefore, an object of the present invention is to provide a disk clamp device which simplifies and thins the disk clamp mechanism, and which does not change the holding power of the optical disk and can reduce the cost. is there.

[0032]

In order to solve the above-mentioned problems, an invention according to claim 1 is a disk clamp device used in a disk device having a spindle motor for rotating an optical disk by a magnetic flux generated by a spindle magnet. A mounting unit having a plurality of magnetic flux through holes for allowing the magnetic flux to pass therethrough, on which the optical disc is mounted and is driven to rotate by the spindle motor; and a mounting unit formed of a magnetic material and mounted on the mounting unit. Clamping means for clamping the optical disk by the attraction force of the magnetic flux passing through the magnetic flux through hole.

According to a second aspect of the present invention, in a disc clamp device used in a disc device having a spindle motor that rotationally drives an optical disc by the magnetic flux generated by a spindle magnet, a plurality of magnetic flux transmitting members that pass the magnetic flux are provided. A mounting means which mounts the optical disk and is rotationally driven by the spindle motor; and an adsorption of the optical disk, which is formed of a magnetic material and mounted on the mounting means, by the magnetic flux passing through the magnetic flux transmitting member. Clamping means for clamping by force.

According to a third aspect of the present invention, in a disc clamp device used in a disc device having a spindle motor for rotationally driving an optical disc by a magnetic flux generated by a spindle magnet, the optical disc is placed and rotationally driven by the spindle motor. And a clamping means for clamping the optical disk formed of a magnetic material and mounted on the mounting means by an attraction force of the magnetic flux generated by the spindle magnet. At least a part of the magnet is configured to wrap around from the outer peripheral portion of the placing means and contact the optical disc.

According to a fourth aspect of the present invention, in a disc clamp device used in a disc device having a spindle motor for rotationally driving the optical disc, the optical disc formed of a magnetic material and placed on the magnetic flux generating and placing means is used. The spindle motor is provided with a clamping unit that clamps by the attraction force of the generated magnetic flux, and the spindle motor has a magnetic flux generation mounting unit that generates a magnetic flux for rotationally driving the optical disc. To do.

[0036]

According to the first aspect of the invention, the mounting means mounts the optical disk and is rotationally driven by the spindle motor.

At this time, the clamping means clamps the optical disk mounted on the mounting means by the attraction force of the magnetic flux passing through the magnetic flux through hole.

Therefore, the optical disc can be clamped by utilizing the magnetic flux of the spindle magnet.

According to the second aspect of the present invention, the mounting means mounts the optical disk and is rotationally driven by the spindle motor.

At this time, the clamping means clamps the optical disk mounted on the mounting means by the attraction force of the magnetic flux passing through the magnetic flux transmitting member.

Therefore, the optical disc can be clamped by utilizing the magnetic flux of the spindle magnet.

According to the third aspect of the present invention, the mounting means mounts the optical disk and is rotationally driven by the spindle motor.

At this time, since the spindle magnet has a structure in which at least a part of the spindle magnet wraps around the outer peripheral portion of the mounting means and contacts the optical disk, the clamping means causes the optical disk mounted on the mounting means. Is clamped by the attraction force of the magnetic flux generated by the spindle magnet.

Therefore, the optical disc can be clamped by utilizing the magnetic flux of the spindle magnet.

According to the fourth aspect of the invention, the magnetic flux generating and mounting means mounts the optical disk and generates a magnetic flux for rotationally driving the optical disk.

At this time, the clamping means clamps the optical disc mounted on the magnetic flux generating / mounting means by the attraction force of the generated magnetic flux.

Therefore, the optical disc can be clamped by utilizing the magnetic flux of the spindle magnet.

[0048]

Embodiments of the present invention will now be described with reference to the drawings.

(First Embodiment) FIG. 1 shows a sectional view of a disk drive unit having a disk clamp mechanism.

The disk drive unit comprises a base 1 made of a thin resin plate and a spindle coil 2 bonded onto the base 1. On the base 1, the spindle coil 2 is used as an external power source. Power supply wiring (not shown) for connection is provided.

The spindle coil 2 is formed by winding a copper wire, and a plurality of spindle coils 2 are arranged on the circumference of an imaginary circle having a predetermined radius on the base 1. In this case, the spindle coil 2 is thinned in the vertical direction (rotational axis direction) to reduce the thickness of the disk drive unit, and thus the optical disk recording / reproducing apparatus.

As the shape of the spindle coil 2 seen from the upper side of the drawing, there are various shapes such as a triangle and a square which are devised to improve the rotational driving force. As for the arrangement of the spindle coil 2 on the base 1, there is also one arranged only on the semicircle side of a circle having a predetermined radius.

At the center of a virtual circle on the base 1 on which the spindle coil 2 is arranged, a bearing portion 4 made of metal or a material having a similar strength is press-fitted onto the base 1. A rotary shaft 3 made of metal or a material having a strength equivalent to that of metal is rotatably inserted into the portion 4 perpendicularly to the base 1.

A circular turntable 19 is attached to the rotary shaft 3.
Are fitted. A protrusion 19A for guiding the holding hole 5A of the optical disk 5 to the center of rotation is provided above the turntable 19.

A spindle magnet 8 arranged so as to face the spindle coil 2 is bonded to the lower portion of the turntable 19.

The spindle magnet 8 has a ring shape having a center at the same position as the center of the turntable 19, and in order to make the magnetic flux enter the spindle coil 2, it is magnetized so as to generate the magnetic flux in the vertical direction. is there.

Further, the turntable 19 is provided with a through hole 20 from the bonding surface of the spindle magnet 8 toward the optical disk mounting surface. When viewed from the upper surface side (the upper side in the drawing) of the turntable 19, the through holes 20 are arranged so as to divide the central angle evenly at a substantially uniform distance from the center of rotation of the turntable 19.

Here, the holding operation of the optical disk will be described. When holding the optical disk 5, the optical disk 5 is placed on the turntable 19 and then a circular clamper plate 21 made of a magnetic material is mounted on the turntable 19 and the optical disk 5.

A concave portion is formed in the center of the clamper plate 21 so as to come into contact with the optical disc 5 and the protrusion 19A on the upper portion of the turntable 19, respectively. In this case, in principle, the thickness of the clamper plate 21 does not matter, but it is preferable to make it as thin as possible in order to make the optical disk device thin.

When the magnetic force generated in the spindle magnet 8 reaches through the through hole 20, the clamper plate 21 is attracted to press the turntable 19 and the optical disk 5.

Therefore, the optical disk 5 is sandwiched between the clamper plate 21 and the turntable 19 and held on the turntable 19.

In this case, the number and shape of the through holes 20 are not limited, but the holding force of the optical disk 5 can be adjusted by increasing or decreasing the number and area of the through holes 20. is there.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG.

The second embodiment differs from the first embodiment in that
The point is that a turntable 23 having a yoke 22 made of a magnetic material embedded in the position of the through hole 20 is used instead of the turntable 19 having the through hole 20. The same or similar parts as those of the first embodiment of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

Next, the operation of holding the optical disk will be described. After placing the optical disk 5 on the turntable 23, the clamper plate 21 is mounted on the turntable 23 and the optical disk 5.

The clamper plate 21 is attracted by the magnetic force generated from the spindle magnet 8 via the yoke 22 so as to press the turntable 23 and the optical disk 5.

By sandwiching the optical disk 5 with the clamper plate 21 and the turntable 23,
The optical disc 5 is held and fixed on the turntable 23.

In this case, the number, shape and material of the yokes 22 are not limited, but the holding power of the optical disk 5 can be increased by increasing or decreasing the number and area of the yokes 22 or by using materials having different magnetic permeability. Can be adjusted.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG.

The third embodiment is different from the first embodiment in that
Instead of the turntable 19 having the through hole 20, a turntable 24 having a small outer diameter is provided, and the turntable 24 has a circular shape and has a concave portion at the center thereof and goes around the outer periphery of the turntable 24, and the upper outer periphery of the turntable 24 has the upper portion of the turntable 24. The point is that a spindle magnet 25 having a structure flush with the disk mounting surface is provided. The same or similar parts as those of the first embodiment of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

Next, the holding operation of the optical disk will be described. After mounting the optical disk 5 on the turntable 24, the clamper plate 21 is mounted on the turntable 24 and the optical disk 5.

The clamper plate 21 is attracted so as to press the turntable 24 and the optical disk 5 by the magnetic force generated from the portion 25A around which the spindle magnet 25 goes around the outer circumference of the turntable 24.

As a result, the clamper plate 21 and the turntable 24 sandwich the optical disk 5,
The optical disk 5 will be held on the turntable 24.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG.

In the fourth embodiment, the turntable and the spindle magnet are integrated, the turntable 26 is composed of a magnet, and the turntable 26 also serves as the spindle magnet in the first embodiment. . The same or similar parts as those of the first embodiment of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

Next, the holding operation of the optical disk will be described. After placing the optical disk 5 on the turntable 26, the clamper plate 21 is mounted on the turntable 26 and the optical disk 5.

The clamper plate 21 is attracted by the magnetic force generated by the turntable 26 so as to press the turntable 26 and the optical disk 5.

As a result, the optical disk 5 is held on the turntable 26 by sandwiching the optical disk 5 with the clamper plate 21 and the turntable 26.

As described above, according to the respective embodiments, it is possible to easily hold (clamp) the optical disk by utilizing the magnetic force of the spindle magnet without complicating the structure of the disk drive section. .

[0080]

According to the first aspect of the invention, the mounting means mounts the optical disk and is rotationally driven by the spindle motor, and the clamping means mounts the optical disk mounted on the mounting means in the magnetic flux through hole. Since it is clamped by the attraction force of the magnetic flux that has passed through, the optical disc can be clamped using the magnetic flux of the spindle magnet, the disc clamping mechanism can be simplified and thinned, and the holding force of the optical disc does not change, It is possible to reduce costs.

According to the second aspect of the invention, the mounting means mounts the optical disk and is rotationally driven by the spindle motor, and the clamping means passes the optical disk mounted on the mounting means through the magnetic flux transmitting member. Because it is clamped by the attractive force of the magnetic flux, the magnetic flux of the spindle magnet can be used to clamp the optical disc, which simplifies the disc clamping mechanism and makes it thinner, and the holding force of the optical disc does not change, resulting in low cost Can be realized.

According to the third aspect of the present invention, the mounting means mounts the optical disk and is rotationally driven by the spindle motor, and at least a part of the spindle magnet wraps around the outer peripheral portion of the mounting means. The optical disc is brought into contact with the optical disc, and the clamping unit clamps the optical disc mounted on the mounting unit by the attraction force of the magnetic flux generated by the spindle magnet, so that the optical disc can be clamped by using the magnetic flux of the spindle magnet. The disk clamp mechanism can be simplified and thinned, and the holding power of the optical disk does not change, so that the cost can be reduced.

According to the fourth aspect of the invention, the magnetic flux generating and mounting means mounts the optical disk, generates magnetic flux for rotationally driving the optical disk, and the clamping means mounts on the magnetic flux generating and mounting means. The optical disc is clamped by the attracting force of the generated magnetic flux, so the optical disc can be clamped by using the magnetic flux of the spindle magnet, which simplifies and thins the disc clamping mechanism, and also improves the holding power of the optical disc. It is possible to reduce the cost without changing. Furthermore, since the mounting means (turntable) and the spindle magnet are integrally formed, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing a configuration of a clamp mechanism according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing the configuration of a clamp mechanism according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing the configuration of a clamp mechanism according to a third embodiment of the present invention.

FIG. 4 is a sectional view showing the structure of a clamp mechanism according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a configuration of a conventional clamp mechanism using a magnet.

FIG. 6 is a cross-sectional view showing the configuration of a conventional clamp mechanism including an O-ring and a ball bearing.

FIG. 7 is a perspective view of the second conventional example of FIG.

[Explanation of symbols]

 1 Base 2 Spindle Coil 3 Rotating Shaft 4 Bearing 5 Optical Disc 8 Spindle Magnet 19 Turntable 20 Through Hole 21 Clamper Plate 22 Yoke 23 Turntable 24 Turntable 25 Spindle Magnet 26 Turntable

Claims (4)

[Claims] 1. A disk clamp device used in a disk device having a spindle motor for rotating and driving an optical disk by a magnetic flux generated by a spindle magnet, the magnetic disk having a plurality of magnetic flux through holes for allowing the magnetic flux to pass therethrough. And a mounting means that is rotationally driven by the spindle motor and a clamping means that is formed of a magnetic material and clamps the optical disk mounted on the mounting means by the attraction force of the magnetic flux that has passed through the magnetic flux through hole. And a disc clamp device. 2. A disk clamp device used in a disk device having a spindle motor for rotating and driving an optical disk by a magnetic flux generated by a spindle magnet, comprising a plurality of magnetic flux transmitting members for passing the magnetic flux.
A mounting means that mounts the optical disk and is driven to rotate by the spindle motor; and an attracting force by the magnetic flux that passes through the magnetic flux transmitting member and that is formed of a magnetic material on the optical disk. A disc clamping device comprising: 3. A disk clamp device used in a disk device having a spindle motor for rotationally driving an optical disk by a magnetic flux generated by a spindle magnet, and mounting means for mounting the optical disk and rotationally driving the spindle motor. Clamping means for clamping the optical disk formed of a magnetic material and placed on the placing means by an attraction force of the magnetic flux generated by the spindle magnet, the spindle magnet being at least a part thereof. The disk clamp device is characterized in that the structure is wrapped around the outer peripheral portion of the mounting means and abuts on the optical disk. 4. A disk clamp device used in a disk device having a spindle motor for rotating and driving an optical disk, wherein the optical disk formed by a magnetic material and placed on said magnetic flux generating and mounting means is generated by said magnetic flux. A disc clamping device comprising: a clamping unit that clamps by an attraction force, and the spindle motor includes a magnetic flux generating and placing unit that places the optical disc and generates a magnetic flux for rotationally driving the optical disc.