JP2742071B2 - Disk drive - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive such as an optical disk drive and a magnetic disk drive, and more particularly to a disk drive having a disk-shaped recording medium provided in the disk drive. The present invention relates to clamping means for clamping to a turntable.

[Conventional technology]

Conventionally, a mechanical clamping method and a magnetic clamping method have been known as clamping methods for a disk-shaped recording medium.

The mechanical clamp system is used in a video disk drive, a compact disk drive, and the like. As shown in FIG.
In this method, a clamp member 3 attached to an elastic arm 2 is arranged opposite to the above, and a disk-shaped recording medium 5 is pressed against a turntable 4 formed integrally with the spindle 1.

As another example of this method, as shown in FIG. 6, a clamp member 3 is slidably and rotatably mounted on a shaft 6 suspended from an arm 2 so that the arm 2 and the clamp member 3 are connected to each other. Some have a spring member 7 stretched between them.

On the other hand, the magnet clamp system is used in a 5.25 inch optical disk memory, and as shown in FIG. In this method, a magnetic attraction member 9 called a hub is attached to the center portion, and the disk-shaped recording medium 5 is clamped by a magnetic force acting between the magnet 8 and the hub 9.

[Problems to be solved by the invention]

Of these clamping systems, the mechanical clamping system must include the arm 2 and the clamp member 3 and members for supporting or driving these members, so that not only is the disk drive expensive, but also Since a large space is required for disposing the arm 2 and the clamp member 3 sugar, there is a disadvantage that the disk drive device becomes large. Further, since the clamping force of the disk-shaped recording medium 5, that is, the elastic force of the arm 2 acts in the axial direction of the spindle 1, a large load is applied to the bearing that supports the spindle 1, and the bearing is worn in a short time, However, there is a disadvantage that rotation unevenness easily occurs. The latter disadvantage is particularly problematic in increasing the driving speed of the disk-shaped recording medium 5 and increasing the rising speed.

The magnet clamp method does not have the above-described problem. However, in order to cope with an increase in the driving speed of the disk-shaped recording medium 5 and an increase in the rising speed,
The magnet 8 and the hub 9 must be increased in size to increase the magnetic force acting on the disk-shaped recording medium 5, causing a problem that the disk-shaped recording medium 5 becomes heavy. In addition, in order to unload the disk-shaped recording medium 5 that is structurally attracted to the spindle 1, a force greater than the magnetic force must be applied to the disk-shaped recording medium 5. The force acting on the disk-shaped recording medium 5 and the disk cartridge storing the same is also increased, and these are likely to be adversely affected.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disk drive capable of solving such a technical problem and capable of rotating a disk-shaped recording medium at a high speed, reducing the load on a spindle drive system, and easily performing unloading. is there.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a turntable on which a disc-shaped recording medium is placed, a spindle for driving the disc-shaped recording medium to rotate via the turntable, and A disk drive device comprising a clamp member for clamping to a table, an arm operable in a direction approaching or separating from the turntable and the spindle at a position facing the turntable and the spindle; A clamp member mounting shaft is rotatably mounted at a position opposed to the clamp member, and the clamp member is slidably mounted on the clamp member mounting shaft, and the clamp member is always separated from the arm between the arm and the clamp member. A spring member that urges the And the configuration of providing a magnetic adsorption means that is not in close contact with each other during compression of the spring member between the spindle and the clamping member mounting shaft.

The magnetic attraction means may include a clamp member mounting shaft formed of a magnetic material and a magnet mounted on a portion of the spindle facing the clamp member mounting shaft, or may be mounted on the clamp member mounting shaft. And a spindle formed of a magnetic material. Further, the magnetic attraction means may be constituted by a combination of a magnet and a magnetic attraction member or two magnets having different polarities, and each of these magnetic members may be separately mounted on the opposing portion between the clamp member mounting shaft and the spindle.

[Action]

With this configuration, the disk-shaped recording medium and the spindle are clamped by the combined force of the magnetic force acting between the magnet and the magnetic attraction member and the pressing force of the arm (clamp member). Therefore, the clamping force of the disk-shaped recording medium can be increased as compared with the case where the clamping is performed only by the pressing force of the arm (clamp member) as in the conventional example, and the rotation speed and the rise speed of the disk-shaped recording medium can be increased. Can be speeded up.

Moreover, in this case, the magnetic force acting between the magnet and the magnetic attraction member acts only as a force for clamping the disk-shaped recording medium and does not act on the drive system of the spindle, so that the load on the spindle drive system is not increased. As a result, it is possible to extend the life of the bearing and reduce uneven rotation.

Further, since the clamp member is slidably provided on the clamp member mounting shaft rotatably mounted on the arm, and the spring member is interposed between the arm and the clamp member, when the pressing force of the arm is removed, When the elastic force of the spring member is larger than the magnetic force of the magnet, the clamp member mounting shaft is pulled up together with the arm by the elastic force of the spring member, and the clamping force due to the magnetic force is lost. The arm can be moved to the unclamped position simply by applying a load to the arm. On the other hand, when the magnetic force of the magnet is larger than the elastic force of the spring member,
Although the disk-shaped recording medium remains clamped, the arm can be moved to the unclamped position only by applying the force of its own weight and the difference between the magnetic force and the elastic force to the arm. Therefore, the configuration of the arm driving device can be simplified, and the driving of the arm can be performed smoothly.

Further, when the arm is returned to the unclamped position, only the force corresponding to the weight of the disc-shaped recording medium acts between the spindle and the disc-shaped recording medium.
If the disk-shaped recording medium is lifted with a greater force, it can be unloaded, and there is no risk of damaging the disk-shaped recording medium and the disk cartridge.

Further, since a hub is not required for the disk-shaped recording medium, the weight of the disk-shaped recording medium can be reduced.

〔Example〕

<First Embodiment> FIG. 1 shows a first embodiment of the present invention. In this figure, reference numeral 11 denotes a clamp member mounting shaft formed of a magnetic material, and other members corresponding to the aforementioned FIGS. 5 to 7 are denoted by the same reference numerals.

At the tip of the spindle 1, the spindle axis X-
A cylindrical centering member 13 for centering the disk-shaped recording medium 5 concentrically with X is projected from the disk-shaped recording medium 5 so as to be orthogonal to the axis XX on the outer periphery thereof. Is formed. A magnet 8 is provided inside the cylindrical centering member 13.
Is buried.

At a position facing the tip of the spindle 1, an arm 2 that operates so as to approach or separate from the spindle 1 is provided. The arm 2 is disposed at a position separated from the spindle motor 1 when the clamp is not clamped. When the disk-shaped recording medium 5 is loaded to the clamp position, the arm 2 detects the loading and automatically moves to the spindle motor 1 side. It has become. Since the mechanism is not the gist of the present invention, the illustration is omitted.

The clamp member mounting shaft 11 is formed in a straight rod shape having a bulging portion 11a at a tip end, and the other end is rotatably mounted on the arm 2 via a bearing 15. When the arm 2 is lowered to the clamp position,
As shown in FIG. 1, the bulging portion 11a is adjusted so as to face the magnet 8. Further, the length is formed such that a slight clearance 16 is formed between the magnet 8 and the bulging portion 11a when the arm 2 is lowered to the clamping position, as shown in FIG. The clamp member mounting shaft 11 may be formed of a ferromagnetic material, a magnet having a different polarity from the magnet 8, or a shaft-like member formed of a ferromagnetic material or another material. A magnet having a polarity different from that of the magnet 8 can be attached to the tip.

The clamp member 3 includes a holding portion 3a having a diameter substantially equal to the mounting surface 14 of the spindle 1 and the clamp member mounting shaft.
And a holding portion 3b having an inner diameter in which the sliding member 11 can be slidably inserted. The holding portion 3b is mounted on the outer peripheral surface of the clamp member mounting shaft 11.

The spring member 7 is stretched between the arm 2 and the clamp member 3, and constantly biases the clamp member 3 in a direction away from the arm 2.

Bearings 17 and 18 for smoothing the operation of these members are set in the spring member setting portion of the arm 2.

Hereinafter, the clamping operation of the disk drive device will be described.

Before the disk-shaped recording medium 5 is loaded, as shown in FIG.
A space 19 is provided between the distal end of the spindle 1 and the holding portion 3a of the clamp member 3 to allow the disk-shaped recording medium 5 to pass therethrough.

When the disk-shaped recording medium 5 is loaded to the clamp position, a center hole formed in the disk-shaped recording medium 5 is opened.
A centering member 13 protruding from the tip of the spindle 1 is fitted into 5a, and the disk-shaped recording medium 5 is centered.
At the same time, the arm 2 automatically moves to the spindle motor 1 side, and the pressing portion 3a of the clamp member 3 comes into contact with the disk-shaped recording medium 5, as shown in FIG.

When the arm 2 is further lowered, the spring member 7 is compressed, and the disk-shaped recording medium 5 is pressed with an elastic force proportional to the amount of compression. Further, with the lowering operation of the arm 2, the bulging portion 11 a of the clamp member mounting shaft 11 approaches the magnet 8.

When the bulging portion 11a of the clamp member mounting shaft 11 approaches the starting point of the attraction operation of the magnet 8, the clamp member mounting shaft 11
Is attracted to the magnet 8, and the disk-shaped recording medium 5 is clamped by the combined force of the elastic force (Fs) of the spring member 7 and the magnetic force (Fm) acting between the clamp member mounting shaft 11 and the magnet 8. When the pressing force (Fa) of the arm 2 is larger than the elastic force (Fs) of the spring member 7, the disk-shaped recording medium 5 applies the pressing force (Fa) of the arm 2 and the clamp member mounting shaft 11 to the magnet 11. 8 are clamped by the resultant force of the magnetic force (Fm) acting between them.

At the time of unloading, when the arm 2 is lifted, the clamp member 3 and the clamp member mounting shaft 11 are separated from the spindle 1 through the reverse stroke, and return to the unclamped state in FIG. Therefore, the disk-shaped recording medium 5 can be unloaded from the spindle 1 by lifting it with a force greater than its own weight.

The disk drive device of the above-described embodiment applies the combined force (pressing the arm 2) of the disk-shaped recording medium 5 to the elastic force (Fs) of the spring member 7 and the magnetic force (Fm) acting between the clamp member mounting shaft 11 and the magnet 8. The pressure (Fa) is the elastic force (F
s), it is clamped by the pressing force (Fa) of the arm 2 and the magnetic force (Fm)), so that it is compared with the case of clamping by only the pressing force of the arm 2 as in the conventional example. Thus, the clamping force of the disk-shaped recording medium 5 can be increased. Therefore, it is possible to cope with an increase in the rotational speed of the disk-shaped recording medium 5 and an increase in the rise speed.

Moreover, in this case, the magnet 8 and the clamp member mounting shaft
The magnetic force (Fm) acting between the spindle drive system 11 and the magnetic disk 11 acts only as a force for clamping the disk-shaped recording medium 5 and does not act as a force for pressing the spindle 1 in the direction of its axis XX. , The life of the bearing can be prolonged, and rotation unevenness can be reduced.

Further, at the time of unloading, the arm 2 can be lifted by applying a force equal to or more than the difference between the elastic force (Fs) of the spring member 7 and the magnetic force (Fm) to the arm 2, so that the clamp releasing operation is easy.

Further, when the arm 2 is returned to the non-clamping position, only a force corresponding to the weight of the disk-shaped recording medium 5 acts between the spindle 1 and the disk-shaped recording medium 5, so that the disk 2 can be moved with a greater force. If the disk-shaped recording medium 5 is lifted, it can be unloaded, and there is no risk of damaging the disk-shaped recording medium 5 and the disk cartridge storing the same.

Also, since a hub is not required for the disk-shaped recording medium 5,
The weight of the disk-shaped recording medium 5 can be reduced.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In this figure, members corresponding to those shown in FIGS. 1 to 3 are denoted by the same reference numerals.

As shown in the figure, the magnet 8 is provided on the clamp member mounting shaft 11 side, and the magnetic attraction member 21 is provided on the spindle 1 side, contrary to the disk drive device of the second embodiment. It should be noted that a magnet having a polarity different from that of the magnet 8 can be provided instead of the magnetic attraction member 21. When the spindle 1 is formed of a ferromagnetic material, the magnetic attraction member 21 can be omitted. Other members are the same as those of the disk drive of the first embodiment.

The disk drive of the second embodiment has the same effects as the disk drive of the first embodiment.

Each of the above embodiments is a basic embodiment of the present invention, and the shape and arrangement of each member and the mounting means are not limited to those described above.

Further, the clamp member 3 and the clamp member mounting shaft 11 may be connected by a spline shaft, and these members may be integrally rotated.

〔The invention's effect〕

As described above, the disk drive of the present invention
Since the disk-shaped recording medium is clamped by the combined force of the magnetic force of the magnet and the pressing force of the arm or the elastic force of the spring member, the clamping force of the disk-shaped recording medium is smaller than the method of clamping only by the pressing force of the arm. And the rotation speed and rise speed of the disk-shaped recording medium can be increased.
Further, since the magnetic force does not act as a pressing force on the driving system of the spindle, the load on the spindle driving system is not increased, and the life of the bearing can be reduced and the rotation unevenness can be reduced. Furthermore, since a clamp member is slidably provided on a clamp member mounting shaft rotatably mounted on the arm, and a spring member is provided between the arm and the clamp member,
If the elastic force of the spring member is greater than the magnetic force of the magnet when the pressing force of the arm is removed, the arm can be moved to the non-clamping position only by applying a force equal to or greater than its own weight to the arm. Even if the magnetic force of the magnet is greater than the elastic force of the spring member, the arm can be moved to the non-clamp position only by applying the force of the arm's own weight and the difference between the magnetic force and the elastic force to the arm. Therefore, the configuration of the arm driving device can be simplified and the arm can be driven smoothly. In addition, in the unclamped state, no force greater than its own weight acts on the disc-shaped recording medium, so that the disc-shaped recording medium can be easily taken out and the load on the disc-shaped recording medium and the disc cartridge can be reduced. In addition, since a hub is not required for the disk-shaped recording medium, the weight of the disk-shaped recording medium can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a principal part showing a clamped state of the disk drive according to the first embodiment, FIG. 2 is a sectional view of a principal part showing an unclamped state of the disk drive according to the first embodiment, and FIG.
FIG. 4 is a cross-sectional view of a main part showing a starting state of a clamping operation of the disk drive according to the first embodiment. FIG. 4 is a cross-sectional view of a main part of the disk drive according to the second embodiment. FIG. 6 is a sectional view of a main part showing a first example of such a disk drive device.
FIG. 1 is a sectional view of a principal part showing a second example of a disk drive according to the prior art, and FIG. 7 is a sectional view of a principal part showing a third example of the disk drive according to the prior art. 1: spindle, 2: arm, 3: clamp member, 4: turntable, 5: disk-shaped recording medium, 7: spring member, 8: magnet, 11: clamp member mounting shaft, 15, 17, 18: bearing,
21: Magnetic adsorption member.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-103867 (JP, A) JP-A-58-56392 (JP, U) JP-A-60-9042 (JP, U) JP-A 58-56 49387 (JP, U) Actually open 1987-42151 (JP, U)

Claims (4)

(57) [Claims] 1. A turntable on which a disk-shaped recording medium is mounted, a spindle for rotating and driving the disk-shaped recording medium via the turntable, and a clamp member for clamping the disk-shaped recording medium to the turntable. A disk drive provided with an arm that operates in a direction approaching or separating from the turntable and the spindle at a position facing the turntable and the spindle, and a clamp member at a position of the arm facing the spindle. A spring that rotatably mounts a mounting shaft, slidably mounts the clamp member on the clamp member mounting shaft, and biases the clamp member between the arm and the clamp member in a direction that is always separated from the arm. A member, and the clamp member mounting shaft Disk drive, characterized in that a magnetic adsorption means that is not in close contact with each other during compression of the spring member between the spindle. 2. The disk drive according to claim 1, wherein said clamp member mounting shaft is formed of a magnetic material, and a magnet is mounted on a portion of said spindle facing said clamp member mounting shaft. Disk drive. 3. The disk drive according to claim 1, wherein a magnet is provided on the clamp member mounting shaft, and the spindle is formed of a magnetic material. 4. A disk drive according to claim 1, wherein said magnetic attraction means comprises a combination of a magnet and a magnetic attraction member or two magnets having different polarities, and each of these magnetic members is attached to said clamp member mounting shaft. A disk drive device, wherein the disk drive device is dispersedly mounted on a portion facing the spindle.