JPH08138295A - Disk clamp device - Google Patents

Abstract

PURPOSE: To surely and stably clamp a disk to a turntable while being low in cost by attracting a clamp member to a clamper base in the manner of securing the pressing force of a pressurizing member against the disk due to the elastic deformation of a spring without using a magnet having particularly strong attracting force. CONSTITUTION: A sub-magnet 58 for attracting the clamp member 14 to the clamper base 12 is provided in addition to a main magnet 56 for attracting the clamp member 14 to the turntable 22. By the sub-magnet 58, the clamp member 14 is tentatively fixed to the clamper base 12 so that the clamp member 14 is attracted to a plate 30 which is a magnetic body, until it is attracted to the turntable 22 against the pressing force of a leaf spring 46, and fixedly supported by the clamper base 12. Consequently, by the sub-magnet 58, the clamp member 14 is not elevated even with the thickness of the disk 16, and only the pressurizing part 18B is elevated by the elastic deformation of the leaf spring 46.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a compact disc,
The present invention relates to an improvement of a disc clamp device that clamps a disc on a turntable when reproducing an optical disc such as a laser disc, and in particular, to an improvement of a disc clamp device that clamps the disc by an attractive force of a magnet and a biasing force of elastic deformation of a spring. is there.

[0002]

2. Description of the Related Art A disc clamping device for clamping a disc on a turntable when the disc is reproduced generally has a clamping member (clamper) having a pressing portion that abuts on the disc, and the clamping member is attracted to the turntable. And a magnet. In this general disc clamp device, the clamp member is attracted to the turntable by the attraction force of the magnet to press the disc between the pressing portion and the turntable.

In this case, the thickness of the disc to be clamped by the clamp member is not always constant but varies depending on the disc. For this reason, the gap between the magnet and the turntable differs depending on the difference in the thickness of the disc between when the thin disc is clamped and when the thick disc is clamped. The influence of suction force is reduced. As described above, in the general technique of clamping the disc on the turntable only by the attractive force of the magnet, the attractive force changes depending on the thickness of the disc, and the clamping becomes unstable particularly when playing a thick disc. There was a problem.

For this reason, there has been proposed a disk clamp device provided with a clamp member for holding a magnet, a pressing member, and a plate spring for connecting the clamp member and the pressing member to each other so as to be vertically movable. Yes (actual fairness 2
-37154 gazette). According to this conventional technique, the position of the pressing member elastically supported by the leaf spring moves up and down according to the thickness of the disc, and the gap between the magnet and the turntable held by the clamp member is reduced by the disc. Even if the thickness is different, it does not change and is kept constant. This keeps the attraction force of the magnet constant and securely clamps the disc to the turntable.
Since the pressing member is pressed against the disc by the restoring force of the plate spring generated by the elastic deformation of the plate spring due to the rise of only the pressing member, the disc can be strongly clamped to the turntable.

[0005]

However, in this prior art, since the clamp member is supported by the clamper holder only in a state of being vertically movable, the urging force of the leaf spring (the elasticity of the leaf spring) that presses the pressing member against the disk is increased. If the attraction force of the magnet to the turntable is not stronger than the restoring force of deformation), the clamp member that holds the magnet together with the pressing member that abuts the disc when attracting the clamp member to the turntable rises. However, a large gap is eventually created between the magnet and the turntable. As a result, the influence of the attractive force of the magnet is reduced, and since the leaf spring is not elastically deformed, the pressing member that is originally strongly pressed against the disc by the biasing force of the restoration of the leaf spring at that time can also be pressed against the disc. Weaken.

Therefore, in this conventional technique, in order to stably clamp the disc on the turntable, it is necessary to use a magnet having a strong attracting force, and there is a drawback that the cost is high. On the other hand, conversely, by using a leaf spring with a weak restoring force without using a strong magnet, it is possible to make the attractive force of the magnet stronger than the restoring force of the leaf spring. Since the restoring force of the spring is originally weak, the pressing member cannot be reliably pressed against the disk, and there is a problem in terms of mechanical strength.

Further, in any of the conventional techniques, the clamp member is held in an idle state with respect to the clamper holder holding it, so that the clamp member tilts with respect to the clamper holder due to vibration. However, there is also a drawback that a correct operating position cannot be secured and a clamping error occurs.

In order to solve the above problems, the object of the present invention is to keep the attractive force of the magnet constant even if the thickness of the disk is different without using a particularly strong magnet, and to press the disk by a spring. It is possible to secure a strong pressing force of the disc and to stably clamp the disc to the turntable at a low cost, and at the same time prevent the tilt of the clamp member to prevent a clamping error and securely clamp the disc. It is to provide a disc clamp device that can perform.

[0009]

The present invention provides a clamper base as a first means for solving the above-mentioned problems.
A clamp member vertically movably supported in the opening of the clamper base, a pressing member that abuts on the disc to clamp the disc, a main magnet that attracts the clamp member to the turntable, and a clamp member on the turntable. A disk clamp device comprising: spring means for elastically deforming according to the thickness of the disk by being attracted to urge the pressing member against the disk, further comprising a sub-magnet for attracting the clamp member to the clamper base. The present invention provides a disc clamp device characterized by the above.

The present invention provides, as a second means for solving the above-mentioned problems, in the above-mentioned first problem-solving means,
The sub-magnet is attracted to the magnetic body so that the clamp member is fixedly supported by the clamper base when the turntable is separated from the disc, and the clamp member is attached to the turntable against the biasing force of the spring means. Until it is sucked, the clamp member is attracted to the magnetic body so as to be fixedly supported by the clamper base, but after that, the clamp member is sucked to the clamper base to the extent that it allows the clamp member to separate from the clamper base. The present invention provides a disc clamp device characterized by the following.

As a third means for solving the above-mentioned problems, the present invention is the above-mentioned first or second problem-solving means, wherein the main magnet has an upper surface of a portion penetrating the center hole of the disk of the turntable. Mounted on the
An object of the present invention is to provide a disc clamp device, wherein a portion of the clamp member facing the main magnet is made of a magnetic material.

According to the present invention, as a fourth means for solving the above-mentioned problems, in any one of the above-mentioned first to third problem-solving means, the clamp member is on the turntable side of the clamper base. From the lower part facing the turntable and the upper part which penetrates the opening of the clamper base and is connected to the lower part and which is on the opposite side of the turntable side of the clamper base and has the flange-shaped part facing the clamper base. According to another aspect of the present invention, there is provided a disc clamp device characterized in that the sub magnet is attached to a flange-shaped portion of an upper portion of the clamp member, and the clamper base has a magnetic body in a portion facing the sub magnet.

According to the present invention, as a fifth means for solving the above-mentioned problems, in any one of the above-mentioned first to third problem-solving means, the clamp member is on the turntable side of the clamper base. The lower part facing the turntable and the upper part that penetrates through the opening of the clamper base and is connected to the lower part and extends on the side opposite to the turntable side of the clamper base. The spring means is attached to the clamp member so that the upper surface of the pressing member engages with the lower portion of the clamp member. The present invention provides a disc clamp device characterized by comprising a leaf spring for urging a pressing member.

As a sixth means for solving the above problems, the present invention penetrates a clamper base, a lower portion of the clamper base on the turntable side, which faces the turntable, and an opening of the clamper base. And a lower part of the clamper base, which is connected to the lower part of the clamper base and extends to the opposite side of the turntable side, and is supported by the opening of the clamper base so as to be vertically movable. And a main magnet that attracts the clamp member to the turntable, and a top member of the press member that is attached to the clamp member. The leaf spring that biases the pressing member to engage the lower portion of the member and the turntable are separated from the clamp member. Adsorbed to the magnetic as the clamping member is fixedly supported on the clamper base while,
Further, the clamp member is attracted to the magnetic body so as to be fixedly supported by the clamper base until the clamp member is attracted to the turntable against the biasing force of the leaf spring.
After that, there is provided a disc clamp device including a sub magnet that attracts the clamp member to the clamper base to such an extent that the clamp member can be separated from the clamper base.

As a seventh means for solving the above-mentioned problems, the present invention provides the above-mentioned sixth problem-solving means,
The main magnet is attached to the upper surface of the portion of the turntable that penetrates the center hole of the disc, and the portion of the clamp member facing the main magnet is made of a magnetic material. .

The present invention provides, as an eighth means for solving the above-mentioned problems, in the above-mentioned sixth or seventh means for solving the problems, the sub-magnet is attached to the upper portion of the clamp member, and the clamper base is the sub-device. The present invention provides a disc clamp device characterized by having a magnetic material in a portion facing a magnet.

[0017]

As described above, if the sub magnet for attracting the clamp member to the clamper base is provided in addition to the main magnet for attracting the clamp member to the turntable, the clamp member resists the urging force of the spring means by this sub magnet. It is regulated so that it will not be lifted up temporarily by the clamper base until it is sucked into the turntable,
Even if a magnet having a weak attracting force is used as the main magnet, only the pressing member rises due to the elastic deformation of the spring means generated according to the thickness of the disc, while the clamp member can be attracted to the turntable. Even if different, the disc can be stably clamped to the turntable at low cost.

Further, since the sub magnet is attracted to the magnetic body so that the clamp member is fixedly supported by the clamper base when the turntable is separated from the disc (when not clamped), the clamp member. Does not incline with respect to the clamper base due to vibration, and therefore, it is possible to prevent a mistake in clamping.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 which show a disk clamp device 10 according to the present invention. A clamp member 14 supported by a clamper base 12 so as to be vertically movable, and a pressing member 18 that abuts against a disc 16 to clamp the disc 16.
And a main magnet 56 (see FIG. 2) that attracts the clamp member 14 to the turntable 22, and the clamp member 1
4 is attracted to the turntable 22, and elastically deforms according to the thickness of the disc 16 to urge the pressing member 18 against the disc 16;
The sub magnet 58 attracts the clamp member 14 to the clamper base 12.

As shown in FIGS. 1 and 3 to 7, the clamper base 12 has an opening 28, and the clamp member 1
4 is arranged so as to penetrate the opening 28,
The opening 28 supports the clamper base 12. In addition, around the upper surface side of the opening 28, as shown in FIG.
Further, as shown in FIGS. 3 to 7, a plate 30 formed of a magnetic material is arranged. In FIGS. 1 and 3 to 7, reference numeral 32 denotes a spacer for adjusting the support state of the clamp member 14 on the clamper base 12.
The clamper base 12 is mechanically connected to and supported by a main chassis (not shown) of the disc reproducing apparatus.

As shown in FIGS. 1 and 3 to 7, the clamp member 14 includes a lower portion 14A disposed on the turntable 22 side of the clamper base 12 and the lower portion 1A.
4A and an intermediate portion 14B connected to 4A,
Clamper base 1 connected to the lower part 14A via B
The upper portion 14C extends through the second opening 28 to the side of the clamper base 12 opposite to the turntable 22 side.

The lower portion 14A has a substantially disc shape as shown in FIG. 1, and is arranged to face the turntable 22 as shown in FIGS. As shown in FIG. 7, when the disc 16 is clamped, the main magnet 56 attracts the turntable 22 to press the disc 16 between the pressing member 18 and the turntable 22.

The intermediate portion 14B is shown in FIGS. 1 and 3 to 7.
As shown in FIG. 3, it is composed of a substantially cup-shaped magnet supporting portion 34 having a collar-shaped portion 34A, and a column portion 36 formed so as to extend downward from the magnet supporting portion 34. The collar-shaped portion 34A of the magnet support portion 34 is shown in FIG.
To the opening 2 of the clamper base 12 as shown in FIG.
8 has an outer diameter smaller than the inner diameter of 8. Therefore, the opening 2
In FIG. 8, a gap 37 is formed between the intermediate portion 14B and the clamper base 12 as shown in FIGS. The gap 37 allows the clamp member 14 to move vertically with respect to the clamper base 12. On the other hand, the pillar portion 36 has a role of securing a space that allows the pressing member 18 to rise when the disk 16 is clamped, as shown in FIG.

The upper portion 14C is shown in FIGS. 1 and 3-7.
As shown in FIG.
And a substantially cup-shaped base penetrating portion 38 that engages with the cup-shaped portion of the base penetrating portion 3 so as to overlap from above.
8 is formed so as to extend from the upper end of the clamper base 12, and comprises a collar-shaped portion 40 facing the clamper base 12 on the side opposite to the turntable 22 of the clamper base 12. As shown in FIGS. 3 to 7, the collar-shaped portion 40 has an outer diameter larger than the inner diameter of the opening 28 of the clamper base 12. Therefore, as shown in FIGS. 3 to 6, the collar-shaped portion 40 is locked to the clamper base 12 via the sub-magnet 58, the spacer 32, and the plate 30, which will be described later, when not clamped.

These lower portion 14A and intermediate portion 14
B, the upper portion 14C is integrally connected by a set screw 42 and a tightening pin 44 which are threadedly engaged with each other through these three portions 14A to 14C as shown in FIGS. There is. Each of the set screw 42 and the tightening pin 44 has heads 42a and 44a that are engaged with the clamp member 14, and the two heads 42A and 44a are used to tighten and connect the two portions 14A to 14C from above and below. are doing. Therefore, the collar-shaped portion 40 of the upper portion 14A is
The clamp member 14 as a whole is supported by the clamper base 12 by being locked to the clamper base 12 via a sub magnet 58 and the like which will be described later.

As shown in FIGS. 1 and 3 to 7, the pressing member 18 has a ring-shaped upper surface portion 18A which can be engaged with the lower portion 14A of the clamp member 14, and an outer peripheral edge of the upper surface portion 18A. And a pressing portion 18B that abuts on the disc 16 and presses the disc 16 against the turntable 22. Clamp member 14
As shown in FIG. 1, a plurality of pressing means locking portions 33 are formed so as to project from the peripheral surface of the lower portion 14A of the pressing member 18, and the pressing member 18 is formed as shown in FIGS. The ring-shaped upper surface portion 18 is attached to the pressing means locking portion 33.
The vicinity of the inner peripheral edge of A is engaged from above and is supported by the clamp member 14. Therefore, the pressing member 18
Are movably supported upward with respect to the plate-shaped lower portion 14C.

The spring means 26 are, in the embodiment shown, in FIG.
As shown in FIG. 3 and the subsequent figures, it is composed of a leaf spring 46, and as shown in FIG. 1, the leaf spring 46 has a substantially disk-shaped fixing portion 46A and a radial portion extending from the fixing portion 46. And a radial portion 46B formed as a result.

In the leaf spring 46, as shown in FIGS. 3 to 7, the fixing portion 46A is the lower portion 14 of the clamp member 14.
It is attached to the clamp member 14 by being sandwiched between A and the intermediate portion 14B. Further, as shown in FIG. 1, a spring side fixing hole 50 is formed in the fixing portion 46A so as to be aligned with the clamp side fixing hole 48 formed in the lower portion 14A of the clamp member 14, and FIGS. As shown in FIG. 5, the fixing protrusion 52 formed so as to extend downward from the column portion 36 of the intermediate portion 14B penetrates both the spring-side fixing hole 50 and the clamp-side fixing hole 48, and thus the leaf spring 46. Is fixed so that it does not rotate.
On the other hand, as shown in FIG. 1, the pressing member 18 has a spring engaging groove 54 formed in the upper surface portion 18A thereof, and the leaf spring 46 is
The radial portion 46B is engaged with the spring engagement groove 54.

Also, the radial portion 46B of the leaf spring 46 is
As shown in particular in FIGS. 3 to 7, extends from the fixed portion 46A so as to be inclined upward by the thickness of the upper surface portion 18 of the pressing member 18, and normally, the upper surface portion 1 of the pressing member 18 is formed.
The pressing member 18 is biased downward (toward the turntable 22) so that 8A engages with the lower portion 14A of the clamp member 14. Therefore, the leaf spring 46 is elastically deformed according to the thickness of the disc 16 as a result of the pushing member 18 coming into contact with the disc 16 against the leaf spring 46 and being pushed up, and the restoring force thereof causes the pushing member 18 to move. The disc 16
The disk 16 is elastically pressed against the turntable 22 by pressing the disk 16 against the turntable 22. When the disk 16 is reproduced, the disk 16 is rotated together with the turntable 22 in cooperation with a main magnet 56 described later. It should be noted that this radial portion 46B is shown in FIG.
As shown in FIG. 6, six pieces are provided, but the number is not limited to this, and may be another suitable number in consideration of adjustment of the restoring force when elastically deformed.

The main magnet 56 has a ring shape as shown in FIG. 2, and in the illustrated embodiment, as shown in FIGS. 3 to 7, the disk 1 of the turntable 22 is formed.
6 through the center hole 16a, that is,
The turntable 22 is fitted in an annular groove 22A formed in the upper surface of the central portion 22c and is exposed and attached to the upper surface of the turntable 22. In this case, since the main magnet 56 is provided on the turntable 22 side, the portion of the clamp member 14 facing the turntable 22, that is, the lower portion 14A is formed of a magnetic material. Thus, as shown in FIGS. 6 and 7, the main magnet 56 attracts the clamp member 14 to the turntable 22 by its attractive force when the turntable 22 rises to support the disc 16. As shown in FIG. 7, the disc 16 is clamped on the turntable 22 when the disc 16 is reproduced, and the disc 16 is rotated together with the turntable 22.

In the present invention, "suction" is applied to the main magnet 56 and the sub magnet 58 described later.
Means that these magnets both attract the target by a suction force from a position away from the magnet without directly contacting the target to be attracted, and directly attract the target by a magnet by the magnet. Means However, this is excluded especially when the clamp member 14 is limited to suction to an extent that allows it to be separated from the clamper base 12, and in this case, the object is attracted by the suction force from the position separated from the object to be attracted. It means only that. Further, “adsorption” particularly refers to a state in which the latter magnet is in direct contact with an object to be attracted and exerts an attraction force, among the “attraction”. In the illustrated embodiment, as shown in FIGS. 6 and 7, the main magnet 56 includes the clamp member 1
4 is in direct surface contact with the lower portion 14A of the clamp member 14
Is adsorbed on the turntable 22.

Further, in the illustrated embodiment, the main magnet 56 has a ring shape, but it is not necessarily limited to this. The shape of the main magnet 5 may be not only one but two or more main magnets 5 in this case.
6 may be used. Further, in the above-described embodiment, the entire lower portion 14A of the clamp member 14 is formed of a magnetic material, but if at least the portion of the clamp member 14 facing the turntable 22 is formed of a magnetic material, the main magnet is formed. Since the suction can be performed by 56, only the lower surface of the lower portion 14A or the entire clamp member 14 may be formed of a magnetic material.

On the other hand, the sub magnet 58 has a ring shape as shown in FIG.
As shown in, the clamp member 14 is supported so as to be sandwiched from above and below by the collar-shaped portion 34A of the intermediate portion 14B and the collar-shaped portion of the upper portion 14C. The outer diameter of the ring-shaped sub magnet 58 is larger than the inner diameter of the opening 28, as shown in FIGS.
8 is set to a size capable of engaging with the clamper base 12. In this case, as described above, the collar-shaped portion 34A of the intermediate portion 14B is smaller than the inner diameter of the opening 28 and enters the opening 28. Therefore, as shown in FIGS. Collar part 4
0 and the clamper base 12 are engaged with the plate 30 of the clamper base 12 from above, and the clamp member 14 is indirectly supported by the clamper base 12 by the engaging portion. From this, the clamp member 14 is assembled by connecting the upper portion 14C to the opening portion 28 from above and then connecting the lower portion 14A.

Further, in this case, since the plate 30 with which the sub magnet 58 is engaged is made of a magnetic material as described above, the sub magnet 58 can be attracted to the clamper base 12 having this plate 30. it can. Therefore, as shown in FIGS. 3 to 6, when the turntable 22 is separated from the disc 16 (when not clamped), the magnetic member is fixed so that the clamp member 14 is fixedly supported by the clamper base 12. Plate 30
Can be adsorbed on. Therefore, due to vibration, etc.
The clamp member 14 does not incline with respect to the clamper base 12 to prevent a clamp error, and
Can be reliably clamped to the turntable 22. Although the plate 30 of the clamper base 12 is made of a magnetic material in the illustrated embodiment, the clamper base 12 is
At least the portion facing the sub magnet 58 has a magnetic body, and the main body of the clamper base 12 itself may be a magnetic body instead of the plate 30.

Further, since the sub magnet 58 is directly attracted to the plate 30, its attractive force is sufficiently exerted so that the clamp member 14 is strongly temporarily fixed to the clamper base 12 and is not lifted. can do. Specifically, as shown particularly in FIG. 6, the clamp member 14 is fixed to the clamper base 12 until the clamp member 12 is attracted to the turntable 22 against the urging force of the spring means 26 by the main magnet 56. It can be adsorbed to the plate 30 which is a magnetic material so as to be supported by. This causes the main magnet 56 to move to the spring means 2
It is possible to reliably suck the clamp member 14 to the turntable 22 against the force of 6. In addition, at the same time, only the pressing member 18 moves upward to elastically deform the leaf spring 4
It is possible to secure the restoring force of 6 and press the pressing member 18 strongly against the disk 16.

As described above, the sub magnet 58 prevents the clamp member 14 from rising together with the pressing member 18, and indirectly assists the main magnet 56 in attracting the clamp member 14 to the turntable 22. . Here, it should be noted that, due to its nature, the magnet exerts a sufficient attractive force once the target object is caught in the magnetic field and the attractive force is once secured to the target object, so that the main magnet 56 has a sufficient attractive force. In the present invention, the clamp member 14 is temporarily fixed to the clamper base 12 by the sub magnet 58 until the clamp magnet 14 is brought out to secure the close proximity between the clamp member 14 and the main magnet 56 attached to the turntable 22. Even if a magnet having a particularly strong attracting force is not used as 56, the clamp member 14 can be reliably attracted to the turntable 22, and at the same time, the elastic deformation of the leaf spring 46 can be secured.

As a result, the problems of the prior art in which the elastic deformation of the leaf spring and the attraction of the clamp member to the turntable cannot be secured without using a magnet having a strong attraction force are solved, and the cost is reduced. It is possible and beneficial.

After the clamp member 14 is attracted to the turntable 22, the sub-magnet 58 is elastically separated from the plate 30 of the clamper base 12 by the mechanical lifting force of the turntable 22, and the clamp member 14 is clamped. Release 14 from the clamper base 12 to free it.
As a result, the clamp member 14 is, as shown in FIG.
When the disc 16 is reproduced, the disc 16 can be rotated together with the turntable 22 while being clamped. In this way, the sub magnet 58 is used for the clamp member 1
The clamp member 14 can be sucked into the clamper base 12 to such an extent that the 4 can be separated from the clamper base 12. That is, after the separation, the suction force is exerted from a position separated from the plate 30 of the clamper base 12 to indirectly assist the clamp member 14 being attracted to the turntable 22.

The turntable 22 is rotated by a spindle motor 62 arranged below the optical mechanical base 60 shown in FIG. Specifically, as shown in FIGS. 3 to 7, the output shaft 62 that penetrates the optical mechanical base 60 and protrudes upward through the boss portion 22a of the turntable 22.
a is fixedly fitted, and is rotated by the rotation of the output shaft 62a. At the upper end of the boss portion 22a, the clamp member 14
Is formed with a taper 64 into which the head portion 44a of the tightening pin 44 for connecting the. Further, in FIGS. 2 to 7, reference numeral 66 is press urethane arranged on the upper surface of the turntable 22 in order to prevent the disk 16 from being damaged. Further, the optical mechanical base 60 moves up and down by mechanical means such as a cam (not shown).

Next, the disc clamp device 10 of the present invention.
First, as shown in FIG. 3, when the turntable 22 is positioned below the tray 21 and the disc 16 is not clamped, the clamp member 14 is attached to the plate 30 by the sub-member. The magnet 58 fixedly supports the clamper base 12.

Next, in order to reproduce the disc 16, FIG.
As shown in FIG. 5, the turntable 22 moves up, its disc support portion 22b engages with the disc 16 from below, and the central portion 22c enters into the center hole 16A of the disc 16 to center the disc 16. .

Then, the turntable 22 further rises to push the disc 16 up from the tray 21, and as shown in FIG.
Abut on the upper surface of 6. At this point, the leaf spring 46 is still
Is not elastically deformed, and therefore the restoring force of the leaf spring 46 is not acting, so that the pressing member 18 does not press the disk 16 downward. On the other hand, the clamp member 14
Also remains fixedly supported by the clamper base 12 by the sub magnet 58.

When the turntable 22 is subsequently raised, as shown in FIG. 6, the clamp member 14 is attracted to the turntable 22 by the attraction force of the main magnet 56. At this time, the clamp member 14 is attached to the sub magnet 58.
Since it is fixedly supported by the clamper base 12, the main magnet 56 can securely attract the clamp member 14 to the turntable 22 without ascending together with the turntable 22. On the other hand, the pressing member 18 raises the disc 1 raised together with the turntable 22.
6 to the clamp member 14 according to the thickness of 6
And the disk 16 is pressed against the turntable 22 by the restoring force of the leaf spring 46. Until this moment, the sub-magnet 58 is attracted to the plate 30 that is a magnetic body and fixedly supports the clamp member 14 on the clamper base 12. Therefore, this FIG.
Indicates the state at the moment when the clamp member 14 is switched from the state in which it is fixedly supported (adsorbed) to the clamper base 12 by the sub magnet 58 to the state in which it is attracted to the turntable 22 by the main magnet 56. Shows.

Finally, as shown in FIG. 7, as the turntable 22 is raised, the sub magnet 58 separates from the clamper base 12, and the clamp member 14 is released from the clamper base 12. Thereby, the clamp member 1
4 and the pressing member 18 attach the disk 16 to the turntable 2
Rotate with the turntable 22 while clamping it to 2, and read (reproduce) the information recorded on the disc 16.
Is performed. After the reproduction, the operation opposite to the above is performed, and the clamp member 1 is lowered by lowering the turntable 22.
4 is again clamper base 1 by sub magnet 58
2 is fixedly supported.

In the above embodiment, the clamp member 1
4, the lower portion 14A, the intermediate portion 14B, the upper portion 14
Although formed from three parts of C, the intermediate part 14B shown
The upper portion 14C and the upper portion 14C may be integrally formed to attach the sub magnet 58. That is, the intermediate portion 14B
Is not necessarily provided, and the clamp member 14 is
It can be formed of a lower portion 14A and an upper portion connected to the lower portion 14A. In the illustrated embodiment, the upper portion is further divided into an upper portion 14C and an intermediate portion 14B in consideration of convenience of assembly and the like.

In the illustrated embodiment, the main magnet 56
Is attached to the upper surface of the turntable 22 and the clamp member 14 is attracted thereto, but conversely, the main magnet 56 may be attached to the clamp member 14 to attract the turntable 22. Further, in the above embodiment, the disk clamp device 10 in which the turntable 22 is lifted has been described as an example, but it goes without saying that the structure may be such that the turntable 22 is not lifted and the clamp member 14 is lowered. is there. In this case, the clamp member 14 is mechanically lowered to move the clamp member 14 to the turntable 22.
Aspirate into.

In the illustrated embodiment, the main magnet 56 is directly attached to the object to be attracted (the clamp member 14 in the illustrated embodiment, the turntable 22 when the main magnet 56 is attached to the clamp member 14 side). Although it is sucked, it is not always necessary to suck it directly, and conversely, when the clamped state is changed to the non-clamped state, the clamp member 14 is smoothly separated from the turntable 22. The disc 16 may be clamped by pressing this member against the clamp member 14 by the attraction force of the main magnet 56. That is, the attraction force of the main magnet 56 may be exerted from a position away from the turntable 22.

Further, in the above embodiment, the sub magnet 58 is attached to the clamp member 14 and the clamper base 12 is attached.
The sub-magnet 58 is attached to the clamper base 12 and the clamp member 14 is attached to the magnetic member provided on the side.
Alternatively, the clamp member 14 may be fixedly supported by the clamper base 12 by being attracted to the magnetic body provided on the side. In this case, the magnetic body on the clamp member 14 side is the clamp member 1
It can be provided by forming 4 itself from a magnetic material or by using a clamp member 14 having a plate (not shown) made of a magnetic material.

Finally, the disc clamp device 1 of the present invention.
The disc 16 to be clamped by 0 is a CD (compact disc), LD (laser disc), or VH.
Regardless of the type of D, CDV, 8 cm CD, etc., in particular, even if these discs have different thicknesses, they can be clamped stably, and thus various discs can be appropriately handled.

[0050]

According to the present invention, as described above, in addition to the main magnet for attracting the clamp member to the turntable, the sub magnet for attracting the clamp member to the clamper base is provided. Since the clamp member is regulated so as not to rise by being temporarily fixed to the clamper base until it is attracted to the turntable against the biasing force of the spring means, even if a magnet having a weak attraction force is used as the main magnet, the pressing member The only one is that the clamp member can be attracted to the turntable while elastically deforming the spring means generated according to the thickness of the disc, so that the disc can be stably clamped to the turntable at low cost even if the disc thickness is different. There is a real benefit you can do.

Further, since the sub magnet is attracted to the magnetic material so that the clamp member is fixedly supported by the clamper base when the turntable is separated from the disc (when not clamped), the clamp member is attached. Does not incline with respect to the clamper base due to vibration, and it is possible to prevent a clamping error, so that there is a practical advantage that the disc can be reliably clamped to the turntable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an upper portion of a disc clamp device according to the present invention.

FIG. 2 is an exploded perspective view of a lower portion of the disc clamp device of the present invention.

FIG. 3 is a cross-sectional view of the disc clamping device of the present invention when not unclamped.

FIG. 4 is a cross-sectional view of the disc clamp device of the present invention when the turntable supports the disc.

FIG. 5 is a cross-sectional view of the disc clamp device of the present invention when the disc contacts the pressing member.

FIG. 6 is a cross-sectional view of the disc clamp device of the present invention at the moment when the clamp member is attracted to the turntable by the main magnet and at the same time the pressing member is pressed against the disc against the leaf spring.

FIG. 7 is a cross-sectional view of the disc clamp device of the present invention during reproduction (rotation) of the disc.

[Explanation of symbols]

 10 Disc Clamping Device 12 Clamper Base 14 Clamping Member 14A Lower Part of Clamping Member 14B Middle Part of Clamping Member 14C Upper Part of Clamping Member 16 Disc 16A Center Hole of Disk 18 Pressing Member 18A Pressing Member 18B Pressing Part of Pressing Member 21 Tray 22 Turntable 22A Annular Groove 22a Turntable Boss 22b Turntable Disk Support 22c Turntable Central Part 26 Spring Means 28 Opening 30 Plate 32 Spacer 33 Lower Part Pressing Means Locking Part 34 Intermediate Part Magnet support portion 34A Intermediate portion flange portion 36 Intermediate portion pillar portion 37 Gap 38 Upper portion base penetrating portion 40 Upper portion flange portion 42 Screw 42a Screw head 44 Tightening pin 44a Tightening pin Head portion 46 Leaf spring 46A Leaf spring fixing portion 46B Leaf spring radial portion 48 Clamping side fixing hole 50 Spring side fixing hole 52 Fixing protrusion 54 Spring engaging groove 56 Main magnet 58 Sub magnet 60 Optical mechanism base 62 Spindle motor 62a Spindle motor Output shaft 64 Tapered boss 66 Press urethane

Claims (8)

[Claims] 1. A clamper base, a clamp member supported by the clamper base so as to be vertically movable, a pressing member for abutting a disk to clamp the disk, and a main magnet for attracting the clamp member to a turntable. A disk clamp device comprising: spring means for elastically deforming according to the thickness of the disk when the clamp member is attracted to the turntable to urge the pressing member against the disk. A disc clamp device further comprising a sub-magnet for attracting a clamp member to the clamper base. 2. The disc clamp device according to claim 1, wherein the sub magnet is configured such that the clamp member is fixedly supported by the clamper base when the turntable is separated from the disc. The magnetic body such that the clamp member is fixedly supported by the clamper base until the clamp member is attracted to the turntable against the biasing force of the spring means. The disc clamp device is characterized in that the clamp member is attracted to the clamper base, and thereafter the clamp member is sucked to the clamper base to such an extent that the clamp member can be separated from the clamper base. 3. The disc clamp device according to claim 1, wherein the main magnet is attached to an upper surface of a portion of the turntable that penetrates a center hole of the disc, and the main magnet is attached to the clamp member. A disc clamp device characterized in that the portion facing the main magnet is made of a magnetic material. 4. The disc clamp device according to claim 1, wherein the clamp member includes a lower portion on the turntable side of the clamper base and facing the turntable. And an upper portion that is connected to the lower portion through the opening of the clamper base and that is opposite to the turntable side of the clamper base and that has a flange-shaped portion that faces the clamper base. The disc clamp device, wherein the sub-magnet is attached to a collar-shaped portion of the upper portion of the clamp member, and the clamper base has a magnetic body in a portion facing the sub-magnet. 5. The disc clamp device according to claim 1, wherein the clamp member includes a lower portion on the turntable side of the clamper base and facing the turntable. An upper portion that extends through the opening of the clamper base and is connected to the lower portion and extends opposite to the turntable side of the clamper base, the pressing member engaging the lower portion of the clamp member. An upper surface portion that can be fitted and a pressing portion that abuts against the disk to clamp the disk, the spring means is attached to the clamp member, and the upper surface portion of the pressing member is the lower portion of the clamp member. A disc clamp device comprising a leaf spring for urging the pressing member so as to engage with. 6. A clamper base, a lower portion of the clamper base on a turntable side facing the turntable, and an opening portion of the clamper base that penetrates the lower portion and is connected to the lower portion. A clamp member composed of an upper portion extending to the side opposite to the table side and supported by the clamper base so as to be vertically movable, an upper surface portion capable of engaging with the lower portion of the clamp member, and abutting against the disc. And a main magnet for attracting the clamp member to the turntable, and the upper surface of the press member attached to the clamp member is the lower portion of the clamp member. A leaf spring for urging the pressing member so that the turntable is engaged with the disk; When separated from the clamp member, the clamp member is attracted to the magnetic body so as to be fixedly supported by the clamper base, and the clamp member is attracted to the turntable against the biasing force of the leaf spring. Until then, the clamp member is attracted to the magnetic body so as to be fixedly supported by the clamper base, but thereafter, the clamp member is fixed to the extent that the clamp member is allowed to separate from the clamper base. A disc clamp device consisting of a sub magnet that attracts to the clamper base. 7. The disc clamp device according to claim 6, wherein the main magnet is attached to an upper surface of a portion of the turntable that penetrates a center hole of the disc, and the main magnet is provided on the main magnet of the clamp member. The disk clamp device characterized in that the part to be made is made of a magnetic material. 8. The disk clamp device according to claim 6 or 7, wherein the sub magnet is attached to an upper portion of the clamp member, and the clamper base is made of a magnetic material at a portion facing the sub magnet. A disc clamping device comprising: