JPH02137162A - Disk driving device - Google Patents

Abstract

PURPOSE:To improve the revolving speed and rising speed of a recording medium by clamping the disk-shaped recording medium by the resultant of the magnetic force of a magnet and the elastic force of an arm or a spring member. CONSTITUTION:When an arm 2 descends, a spring member 7 to be spread between the arm 2 and a clamp member 11 is compressed and a disk-shaped recording medium 5 is pressed by the elastic force. When a magnetic attracting member 11 is close to a magnet 8 with the descending of the arm 2, the magnetic attracting member 11 is attracted to the magnet 8 and the recording medium 5 is clamped by the resultant of elastic force Fs of the spring member 7 and magnetic force Fm which is operated between the magnetic attracting member 11 and magnet 8. When pressing force Fa of the arm 2 is larger than the elastic force Fs of the spring member 7, the recording medium 5 is clamped by the resultant of the pressing force Fa of the arm 2 and the magnetic force Fm which is operated between the magnetic attracting member 11 and magnet 8. Thus, the revolving speed and rising speed of the recording medium 5 can be improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a disk drive device such as an optical disk drive device or a magnetic disk drive device, and particularly relates to a disk drive device including a disk-shaped recording medium in the disk drive device. This invention relates to a clamping means for clamping to a turntable.

[Conventional technology]

Conventionally, mechanical clamping methods and magnetic clamping methods are known as methods for clamping disk-shaped recording media.

The mechanical clamp method is used in video disk drive devices, compact disk drive devices, etc. As shown in FIG. 7, a clamp member 3 is attached to an elastic arm 2 facing a spindle 1. After placing the disc-shaped recording medium 5 on the turntable 4 formed integrally with the spindle l,
In this method, the clamp member 2 is lowered and the disk-shaped recording medium 5 is pressed by the elastic force of the arm 2.

In addition, as another example of this method, as shown in FIG. 8, a clamp member 3 is slidably and rotatably attached to a shaft 6 hanging vertically from the arm 2, and 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 magnetic clamp method is used in 5.25-inch optical disk memories, and as shown in FIG.
At the same time, a magnetic attracting body 9 called a hub is attached to the center of the disk-shaped recording medium 5, and the disk-shaped recording medium 5 is clamped by the magnetic force acting between these magnets 8 and the hub 9. It is.

[Problem to be solved by the invention]

Among these clamping methods, the mechanical clamping method requires an arm 2, a clamping member 3, and a member for supporting or driving these members, which not only increases the cost of the disk drive device but also requires the above-mentioned cost. Since a large space is required for arranging the arm 2, the clamp member 3, etc., there is a drawback that the disk drive device becomes larger. In addition, 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, causing the bearing to wear out in a short period of time or The disadvantage is that rotational unevenness is likely to occur. The latter drawback is particularly problematic when attempting to increase the drive speed and rise speed of the disk-shaped recording medium 5.

The magnetic clamp method does not have the above-mentioned problems. However, in order to cope with higher drive speeds and faster rising speeds of the disk-shaped recording medium 5, the magnet 8 and hub 9 have to be made larger to accommodate the disk-shaped recording medium 5. The magnetic force acting on the disk-shaped recording medium 5 must be increased, which causes the problem that the disk-shaped recording medium 5 becomes heavier. In addition, in order to unload the disk-shaped recording medium 5 that is structurally attracted to the spindle 1, it is necessary to apply a force greater than the magnetic force to the disk-shaped recording medium 5, and as the magnetic force is increased, the disk The force acting on the shaped recording medium 5 and the disk cartridge housing it also increases, making it more likely to have an adverse effect on them.

Therefore, the purpose of the present invention is to solve such technical problems and
To provide a disk drive device capable of rotating a disk-shaped recording medium at high speed, with a small load on a spindle drive system, and with easy unloading.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a turntable on which a disc-shaped recording medium is placed, and a spindle that rotationally drives the disc-shaped recording medium through the turntable. Providing an arm that can move toward or away from the
A clamp member was rotatably provided on this arm at a position facing the turntable, and a magnetic attraction means was provided between this arm and the spindle.

[Effect]

In the above manner, the disk-shaped recording medium and the spindle are clamped by the resultant force of the magnetic force acting between the magnet and the magnetic attraction member and the pressing force of the arm (clamping member). Therefore, compared to the case of clamping only by the pressing force of the arm (clamping member) as in the conventional example, the clamping force of the disk-shaped recording medium can be increased, and the rotation speed and rise speed of the disk-shaped recording medium can be increased. The speed can be increased.

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 spindle drive system.
It is possible to extend the life of the bearing and reduce uneven rotation without increasing the load on the spindle drive system.

Furthermore, when the arm is returned to the non-clamped position,
Since only the force equal to the weight of the disc-shaped recording medium acts between the spindle and the disc-shaped recording medium, it is possible to unload the disc-shaped recording medium by lifting it with more force than that. There is no risk of damaging the disc-shaped recording medium and the disc cartridge.

Furthermore, since no hub is used in the disk-shaped recording medium, the weight of the disk-shaped recording medium can be reduced.

〔Example〕

FIG. 1 shows a first embodiment of the present invention. In this figure,
Reference numeral 11 indicates a magnetic attraction member, and other parts corresponding to those in FIGS. 7 to 9 are designated by the same reference numerals.

At the tip of the spindle 1, there is an axis X of the spindle 1.
- A cylindrical centering member 13 for centering the disk-shaped recording medium 5 concentrically with 5 turntables 4 are formed. and,
A magnet 8 is embedded inside the cylindrical centering member 13.

At a position facing the tip of the spindle 1, an arm 2 is provided that can move toward or away from the spindle 1. This arm 2 is placed at a position apart from the spindle 1 when not clamped, and is configured so that when the disk-shaped recording medium 5 is loaded to the clamped position, it detects this and automatically moves toward the spindle 1. It has become. Note that the mechanism is not the gist of the present invention, so illustration thereof is omitted.

The magnetic attraction member 11 is formed in the shape of a straight bar with a bulging portion 11a at its tip, and the other end is rotatably attached to the arm 2 via a bearing 15. The setting position is when arm 2 is lowered to the clamp position.
As shown in FIG. 1, the bulging portion 11a is adjusted to face the magnet 8. Also, its length is
When the arm 2 is lowered to the clamping position, a slight clearance 16 is formed between the magnet 8 and the bulge 11a, as shown in FIG. The magnetic adsorption member 11 may be formed of a ferromagnetic material, or may be formed of a magnet having a polarity different from that of the magnet 8, or may be formed at the tip of a shaft-shaped member made of a ferromagnetic material or other material. A magnet having a polarity different from that of the magnet 8 can also be attached to the section.

The clamp member 3 includes a holding portion 3a having a diameter substantially equal to the mounting surface 14 of the spindle l, and the magnetic attraction member 11.
and a holding portion 3b having an inner diameter that allows the magnetic adsorption member 11 to be slidably inserted thereinto.

The spring member 7 is stretched between the arm 2 and the clamp member 11, and constantly biases the clamp member 11 in a direction away from the arm 2.

Incidentally, bearings 17 and 18 are provided at a portion of the arm 2 facing the clamp 11 and the spring member 7 to smooth the operation of these members.

The clamping operation of the disk drive device described above will be explained below.

Before the disk-shaped recording medium 5 is loaded, as shown in FIG. A space 19 sufficient for inserting the disk-shaped recording medium 5 is provided between them.

When the disk-shaped recording medium 5 is loaded to the clamp position, the center hole 5 opened in the disk-shaped recording medium 5 is opened.
A centering member 13 protruding from the tip of the spindle 1
is inserted, and the disk-shaped recording medium 5 is centered. At the same time, the arm 2 automatically moves toward the spindle l, and as shown in FIG.
a is brought into contact with the disk-shaped recording medium 5.

When the arm 2 is further lowered, the spring member 7 is compressed,
The disk-shaped recording medium 5 is pressed with an elastic force proportional to the amount of compression. Further, as the arm 2 moves downward, the bulging portion 11a of the magnetic attraction member 11 approaches the magnet 8.

When the bulging portion 11a of the magnetic attraction member 11 approaches the starting point of the attraction operation of the magnet 8, the magnetic attraction member 11 is attracted to the magnet 8, and the disk-shaped recording medium 5 is moved to the spring member 7.
It is clamped by the resultant force of the elastic force (Fs) of , and the magnetic force (Fm) acting between the magnetic attraction member 11 and the magnet 8 . Note that when the pressing force (F a) of the arm 2 is larger than the elastic force ('Fg) of the spring member 7, the disk-shaped recording medium 5 is It is clamped by the resultant force of the magnetic force (Fm) acting between the magnet 8 and the magnet 8.

At the time of unloading, when the arm 2 is raised, the clamp member 3 and the magnetic adsorption member 11 are moved through the reverse process to the above.
is separated from the spindle 1 and returns to the unclamped state shown in FIG. Therefore, the disc-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 embodiment holds the disk-shaped recording medium 5 by the elastic force (Fs) of the spring member 7 and the magnetic adsorption member 1.
The resultant force of the magnetic force (Fm) acting between the arm 1 and the magnet 8 (the pressing force (Fa) of the arm 2 is the elastic force (F
s), the pressing force of arm 2 (F a
) and the magnetic force (Fm), the clamping force for the disk-shaped recording medium 5 can be increased compared to the case where the disk-shaped recording medium 5 is clamped only by the pressing force of the arm 2 as in the conventional example. Therefore, it is possible to cope with an increase in the rotational speed and the rise speed of the disk-shaped recording medium 5.

Furthermore, in this case, the magnetic force (Fm) acting between the magnet 8 and the magnetic attraction member 11 acts only as a force for clamping the disk-shaped recording medium 5.

Since it does not act as a force that presses the spindle 1 in the axis X--X direction, the load on the spindle drive system is not increased, and the life of the bearing can be extended and rotational unevenness can be reduced.

Also, during unloading, the elastic force of the spring member 7 (
If a force equal to or greater than the difference between the magnetic force (Fs) and the magnetic force (Fm) is applied to the arm 2, the arm 2 can be raised, so that the clamp release operation is easy.

Furthermore, when the arm 2 is returned to the non-clamped position, only the force of the own weight of the disc-shaped recording medium 5 acts between the spindle 1 and the disc-shaped recording medium 5, so any force greater than that is applied to the disc. The disk-shaped recording medium 5 can be unloaded by lifting it up, and there is no risk of damaging the disk-shaped recording medium 5 or the disk cartridge housing it.

Further, since the disk-shaped recording medium 5 does not require a hub, the weight of the disk-shaped recording medium 5 can also be reduced.

Next, a second embodiment of the present invention will be described based on FIG. 4. In this figure, members corresponding to those shown in FIGS. 1 to 3 described above are designated by the same reference numerals.

As shown in this figure, in the disk drive device of the second embodiment, the clamp member 3 is directly attached to the arm 2, and the spring member 7 is omitted. The other members are constructed in the same manner as the disk drive device of the first embodiment.

The disk drive device of the second embodiment also has substantially the same effects as the disk drive device of the first embodiment, except that the force required to raise the arm 2 during unloading cannot be reduced.

Next, a third embodiment of the present invention will be described based on FIG. In this figure, members corresponding to those shown in FIGS. 1 to 3 described above are designated by the same reference numerals.

As shown in this figure, in the disk drive device of the third embodiment, the height H of the clamp member 3 and the length of the magnetic attraction member 11 are such that the arm 2 is moved toward the spindle l side and the clamp member 3 is When pressed against the disk-shaped recording medium 5, the magnetic attraction member 11 and the magnet 8 are adjusted to be in close contact with each other before the arm 2 and the clamp member 3 come into contact with each other. The other members are the same as those of the disk drive device of the first embodiment.

The clamping operation of the disk drive device according to the third embodiment will be explained below.

The disk-shaped recording medium 5 is loaded into the disk drive device in the unclamped state (see FIG. 2), and the disk-shaped recording medium 5 is centered by the centering member 13 protruding from the tip of the spindle 1. At the same time, the arm 2 automatically moves toward the spindle 1, and the holding portion 3a of the clamp member 3 comes into contact with the disk-shaped recording medium 5 (see FIG. 3).

When the arm 2 is further lowered, the spring member 7 is compressed,
The disk-shaped recording medium 5 is pressed with an elastic force proportional to the amount of compression.

Then, when the bulging portion 11a of the magnetic attraction member 11 approaches the starting point of the attraction operation of the magnet 8, the magnetic attraction member 11
is attracted to the magnet 7, and these two members 8 and 11 are brought into close contact with each other. As a result, the disk-shaped recording medium 5 is clamped with an elastic force proportional to the amount of compression of the spring member 7.

At the time of unloading, when the arm 2 is raised, the clamp member 3 and the magnetic adsorption member 11 are moved through the reverse process to the above.
is separated from the spindle l and returns to the unclamped state. Therefore, the disc-shaped recording medium 5 can be unloaded from the spindle 1 by lifting it with a force greater than its own weight.

When configured as in the third embodiment, the clamping force of the disk-shaped recording medium 5 (the elastic force (FB) of the spring member 7) is combined with the magnetic force (F
m), the clamping force does not act as a force that presses the spindle 1 in the axis X-X direction. Therefore, by increasing the elastic force (FB) of the spring member 7, the load on the spindle drive system can be reduced. The clamping force of the disk-shaped recording medium 5 can be improved without increasing the force.

Next, a fourth embodiment of the present invention will be explained based on FIG. In this figure, members corresponding to those shown in FIGS. 1 to 3 described above are designated by the same reference numerals.

As shown in this figure, in the disk drive device of the fourth embodiment, a magnet 8 is provided on the arm 2 side, and a magnetic magnet is provided on the spindle 1 side, contrary to the disk drive devices of the first to third embodiments. A suction member 11 is provided. Note that instead of the magnetic attraction member 11, a magnet having a different polarity from the magnet 8 may be arranged. Moreover, when the spindle 1 is formed of a ferromagnetic material, the magnetic attraction member 11 can be omitted. The other members are the same as those of the disk drive device of the first embodiment.

The disk drive device of the fourth embodiment also has the same effects as the disk drive device of the first embodiment.

It should be noted that each of the above-mentioned embodiments shows basic embodiments of the present invention, and the shape, arrangement, mounting means, etc. of each member are not limited to those described above.

For example, in the disk drive devices of the second and third embodiments, the magnet 8 may be provided on the arm 2 side, and the magnetic attraction member 11 or a magnet having a different polarity from the magnet 8 may be provided on the spindle 1 side. .

Further, the clamp member 3 and the magnetic attraction member 11 may be connected by a spline shaft so that these members rotate integrally.

〔Effect of the invention〕

As explained above, in the disk drive device of the present invention, the disk-shaped recording medium is clamped by the resultant force of the magnetic force of the magnet and the elastic force of the arm (or spring member). Compared to the clamping method, the clamping force for the disk-shaped recording medium can be increased. Therefore, it is possible to increase the rotational speed and rise speed of the disk-shaped recording medium. Further, since all or part of the clamping force is prevented from acting on the spindle drive system, the load on the spindle drive system is not increased, and the life of the bearing can be extended and rotational unevenness can be reduced. Furthermore, in the unclamped state, no force greater than its own weight is applied to the disc-shaped recording medium, and the burden on the disc-shaped recording medium and the disc cartridge can be reduced. Furthermore, since the disc-shaped recording medium does not require a hub, it is possible to reduce the weight of the disc-shaped recording medium.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of main parts showing a clamped state of the disk drive device according to the first embodiment, FIG. 2 is a cross-sectional view of main parts showing the disk drive device according to the first embodiment in an unclamped state, and FIG.
The figure is a sectional view of the main parts of the disk drive device according to the first embodiment showing the start state of the clamping operation, FIG. 4 is a sectional view of the main parts of the disk drive device according to the second embodiment, and FIG. 5 is the main part of the disk drive device according to the second embodiment. FIG. 6 is a cross-sectional view of a main part of a disk drive according to the fourth embodiment, and FIGS. 7 to 9 are cross-sections of main parts of a disk drive according to a prior art. It is a diagram. 1. Nissin spindle, 2: Arm, 3: Clamp member, 4:
turntable, 5: disk-shaped recording medium, 7: spring member, 8: magnet, 11: magnetic attraction member, 15, 17
．． 18: Bearing. Tora1vlJ Figure 2 Figure 3 Figure 4 Figure 7 Figure 9! 5 Figure tK6v! J Figure 8

Claims (1)

[Scope of Claims] (1) A turntable on which a disc-shaped recording medium is placed, a spindle that rotationally drives the disc-shaped recording medium via this turntable, and a clamping of the disc-shaped recording medium to the turntable. In the disk drive device, an arm is provided opposite to the turntable and spindle and can move toward or away from the turntable and spindle, and the arm is located at a position facing the turntable. A disk drive device comprising a rotatable clamp member and a magnetic attraction means between the arm and the spindle. (2) In the disk drive device according to claim 1, the clamp member is attached to the arm so as to be rotatable and movable in a direction toward or away from the arm, and the clamp member is always provided between the clamp member and the arm. A disk drive device characterized in that a spring member is provided that urges the arm away from the arm. (3) In the disk drive device according to claim 1 or 2, when the arm is moved toward the spindle and the tip of the clamp member is pressed against the disk-shaped recording medium, the arm is provided with a A disk drive device characterized in that a minute clearance is created between the magnetic attraction means provided on the spindle and the magnetic attraction means provided on the spindle. (4) In the disk drive device according to claim 2, when the arm is moved toward the spindle and the clamp member is pressed against the disk-shaped recording medium, before the arm and the clamp member come into contact with each other, the A disk drive device characterized in that a magnetic attraction means provided on an arm and a magnetic attraction means provided on the spindle are in close contact with each other. (5) In the disk drive device according to claim 1 or 2, a magnet is provided on the spindle,
A disk drive device characterized in that the arm is provided with a magnetic attraction member or a magnet having a polarity different from that of the magnet. (6) The disk drive device according to claim 1 or 2, wherein the arm is provided with a magnet, and the spindle is provided with a magnetic attraction member or a magnet having a polarity different from that of the magnet. Device. (7) The disk drive device according to claim 1 or 2, wherein the arm is provided with a magnet, and the spindle is made of a magnetic material.