JP2004118897A - Optical disk driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize separation between a clamper and a turntable without employing a relatively large load, to reduce the load on a loading motor as a result and to easily conduct emergency ejection by providing one side impact on the holding surface of a clamper holder by a clamper dropping preventive flange section while the clamper, which is linked to the descending operation of a spindle motor, is descending and by forcibly separating from a one side touch section. <P>SOLUTION: An optical disk driver is provided with a spindle motor 3 which has a turntable 3a and is made freely movable in up and down and rotative manners between a loading position and an unloading position, a clamper 40 which makes magnetic contact with the top surface of the turntable at the loading position and a clamper holder 31 which is provided with a holding surface 33 that suspends and holds the clamper by contacting a holding hole 32 that freely engages with the clamper and a flange section 42. The holding surface of the clamper holder is tilted with respect to the surface of an optical disk located at the loading position. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disc drive device such as a CD-ROM, a CD-R, a CD-RW, and a DVD, and more particularly to an improvement in an optical disc clamping device for clamping an optical disc between a turntable and a clamper.
[0002]
[Prior art]
2. Description of the Related Art In recent years, in optical disk drive devices for recording and reproducing data on and from optical disks such as CDs and DVDs, the rotational speed of optical disks has been increased, and those having a rotational speed exceeding 10,000 rpm have been commercialized. A general optical disk drive device includes a spindle motor for supporting and rotating the center of the optical disk with a turntable, and a clamper magnetically attracted to the upper surface of the turntable. Rotate while holding it. One of the turntable and the clamper is provided with a magnet, and the optical disk is held by the attraction of the magnet. As the rotational speed of the optical disk increases, disturbances such as eccentricity, impact, and vibration of the optical disk make it difficult for the turntable and the clamper to stably hold the optical disk. If the optical disk falls off, there is a risk that a reproduction error or the optical disk may be damaged by contact with other components. By strengthening the magnetic force between the turntable and the clamper, such troubles can be prevented, but the load separating the turntable and the clamper during unloading of the optical disk increases, and the load on the loading motor increases. In such a case, there is a problem that the emergency ejection becomes difficult.
For example, in an optical disk clamping device described in Japanese Patent Application Laid-Open No. 7-182755, a wedge is provided behind a tray for transporting an optical disk to a predetermined position during loading and unloading. When the tray is discharged by unloading, a wedge on the tray is inserted between the chucking pulley (clamper) and the disc table (turntable) which are attracted to each other, and the two are forcibly separated from each other. Therefore, according to this, even if the magnetic force between the clamper and the turntable is increased, unloading can be performed smoothly. In the drive device having such a structure, the tray needs to be ejected before the spindle motor descends to separate the turntable from the clamper. However, the unloading operation in a general optical disk drive device is such that the tray is ejected after the spindle motor has finished descending, so that the clamper and the turntable are separated by the moving force at the time of ejecting the tray. Is structurally difficult. That is, the clamp release structure described in the above publication cannot be applied to a general optical disk drive device.
[Patent Document 1] JP-A-7-182755
[Problems to be solved by the invention]
The present invention has been made in view of the above, and by adsorbing a clamper suspended vertically movably by a clamper holder and a turntable provided on an output shaft of a spindle motor, an optical disc central portion is formed. In an optical disc clamping mechanism with a clamping structure, the clamper holder is not moved when the clamper descends in conjunction with the spindle motor descending operation without forcibly releasing the suction between the clamper and the turntable in conjunction with the ejection operation of the tray holding the disc. An optical disc with a holding surface that forcibly peels off the flange part for preventing the clamper from falling off from one end side, realizing peeling without applying a particularly large load, thereby reducing the load on the loading motor and making it easy to perform emergency ejection It is an object to provide a drive device.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is a spindle motor including a turntable that supports and rotates an optical disk center portion and is configured to be vertically rotatable between a loading position and an unloading position. A clamper which is vertically movable above the turntable and magnetically attached to the upper surface of the turntable at the loading position, contacts a holding hole for fitting the clamper up and down, and a lower surface of a flange for preventing the clamper from falling off. And a clamper holder having a holding surface for suspending and holding the clamper, whereby the optical disc on the turntable is attracted to the magnet between the turntable and the clamper when the spindle motor is raised to the loading position. Optical disc having an optical disc clamping mechanism In the drive device, the holding surface of the clamper holder, characterized in that is inclined with respect to the optical disk surface in the loading position. Normally, the clamper holder includes a holding hole for loosely fitting the clamper so as to be vertically movable, and a holding surface for holding a flange portion provided on the clamper for preventing falling off. Normally, the holding surface is substantially horizontal (parallel to the optical disk surface at the loading position), but by tilting the holding surface, the clamper and the clamper holder are brought into contact at one point during the initial stage when the spindle motor is lowered during unloading. Touch Thus, the force required to separate the turntable and the clamper can be reduced by the principle of leverage as compared with the case where the turntable is horizontal. For this reason, while reducing the load on the loading motor, the magnet attraction force between the turntable and the clamp can be increased in accordance with the higher speed of the disk rotation.
[0005]
A second aspect of the present invention provides a spindle motor including a turntable for supporting and rotating the center of the optical disk and configured to be rotatable up and down between a loading position and an unloading position. A clamper movably supported and magnetically attached to the upper surface of the turntable at the loading position, and a holding hole for fitting the clamper up and down and a lower surface of a flange portion for preventing falling of the clamper, thereby suspending and holding the clamper. And a clamper holder having a holding surface for holding the optical disk. The optical disk clamp mechanism holds the optical disk on the turntable by a magnet attraction force between the turntable and the clamper when the spindle motor moves up to the loading position. An optical disk drive device having a Characterized in that a step portion in a part of the holding surface of Pahoruda.
In the first aspect of the present invention, the surface of the clamper holder that supports the clamper is inclined, but it is not always necessary to incline the entire surface. In order to obtain the same detaching action as described above, it is sufficient that one point of the holding surface and the flange portion of the clamper come into contact first when the clamper is lowered by unloading. Therefore, by providing the protrusion on a part of the holding surface, the same separation effect can be obtained. Therefore, as in the case of the first aspect, the force required at the time of unloading can be reduced.
[0006]
According to a third aspect of the present invention, when the spindle motor is lowered for unloading, the holding surface of the clamper holder which is in direct contact with the clamper is rotated during the lifting and lowering operations of the spindle motor during loading and unloading. It is characterized by being located away from the center.
In the first and second aspects of the present invention, the direction of the contact point between the clamper holder and the clamper at the time of unloading is not mentioned, but the inclination angle of the clamper holder or the step difference of the protrusion is reduced to reduce the thickness of the clamper holder. It is desirable not to increase the size in terms of space. On the other hand, the spindle motor, which is supported by a chassis whose rear edge is supported so as to be able to move up and down, rotates up and down around the rotation center of the chassis during loading and unloading. That is, at the time of unloading, the turntable gradually descends from the horizontal position while being inclined. In order to efficiently separate the clamper from the turntable, it is necessary to increase the angle between the turntable and the clamper. For this purpose, it is advantageous that the inclination direction of the turntable and the inclination direction of the clamper holder and the clamper at the time of unloading are opposite to each other in order to reduce the inclination angle of the clamper holder or the level difference of the protrusion. Therefore, it is possible to avoid inadvertently increasing the thickness of the clamper holder.
According to a fourth aspect of the present invention, in the first, second or third aspect, the inclined surface or the protrusion is provided on a lower surface of a flange portion for preventing the clamper from falling off in contact with the holding surface in place of the holding surface of the clamper holder. It is characterized by having been formed.
In order to eliminate the state in which the clamper pushed up by the turntable at the loading position is attracted by the turntable and the magnet at the time of unloading with a small detaching force, the holding surface on the clamper holder side is entirely covered as described in the above claims. The projection may be inclined or one projection may be provided. This means that unloading with a small separating force can be performed as long as the phenomenon in which the clamper falls down in the holding hole of the clamper holder even when the clamper first hits one side can be generated. If the holding surface is a flat horizontal surface similar to the conventional one, even if the lower surface of the flange portion on the clamper side that is in contact with the holding surface is inclined or a projection is provided, a similar separating force due to one-sided contact is obtained. A reduction effect can be obtained.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
1 and 2 are views showing an optical disk drive device provided with an optical disk clamp mechanism according to the present invention. FIG. 1 is a schematic exploded perspective view of a main part, and FIGS. 2 (a) and 2 (b) show an assembled state. It is a schematic sectional drawing.
This optical disk drive device includes a drive mechanism A, a tray B for holding a disk D, a housing C, and a clamp mechanism E.
The drive mechanism A includes a chassis 1 having one end (right end) supported by a housing C so as to be vertically movable, an optical pickup 2 mounted on the chassis 1, a spindle motor 3 for rotating a disk D, and an optical drive. A seek rail 4 for sliding the pickup 2 in the radial direction of the disk D and a seek motor 5 for moving the optical pickup 2 on the seek rail 4 are provided.
The tray B is supported so that the optical disc D is placed on the upper surface, and the tray B can be horizontally moved in and out from the entrance on the front surface of the housing C. The tray B has an opening 25 for fitting a spindle motor (turntable) into the center hole 21 of the optical disc D.
The housing C is provided at the inner bottom of the frame 10 for housing the drive mechanism A, the tray B, and the clamp mechanism E, and is provided for supporting the rear end of the chassis 1 so as to be vertically movable. The vehicle includes a pedestal 11, an elevator 12 disposed at the front of the frame 10 so as to be vertically movable, a cover (not shown) for covering an outer surface including an upper opening of the frame 10, and the like.
The center holes of the vibration isolating rubber 8b are fitted and fixed to the plurality of projections 11a provided on the pedestal 11, respectively, while the grooves provided on the outer periphery of the vibration isolating rubber 8b are provided on the rear edge of the chassis 1. The fitting recess 1b is fitted to support the chassis 1 so as to be able to move up and down around the vibration isolating rubber 8b. A center hole of another vibration isolating rubber 8a is fitted and fixed to the plurality of projections 12a provided on the elevator 12, while an outer peripheral groove portion of the vibration isolating rubber 8a has a fitting recess 1a provided on a front end edge of the chassis 1. And is fixed. Therefore, the chassis 1 can move up and down around the rear edge by the up and down operation of the elevator 12.
The clamp mechanism E includes a clamper holder 31 fixed to the frame 10, a clamper 40 fitted into the holding hole 32 of the clamper holder 31 and held vertically movably, and a turntable rotationally driven by the spindle motor 3. 3a and a permanent magnet 41 disposed on one of the clamper 40 and the turntable 3a (in this example, on the side of the clamper 40). Further, the clamper 40 has a flange portion 42 at an upper portion thereof to prevent the clamper 40 from dropping out of the holding hole 32, and has a contact portion 43 at the lower portion which comes into contact with the upper surface of the optical disk center. The periphery (upper surface) of the holding hole 32 of the clamper holder 31 is a clamp holding surface (clamp holding portion) 33, and the lower surface of the flange portion 42 of the clamper is held at the time of unloading shown in FIG. Hold with. The clamper 40 is pushed upward by the turntable 3a at the loading position shown in FIG. 2A, and is dropped and seated on the holding surface 33 by its own weight at the unloading position shown in FIG. 2B.
[0008]
In the above configuration, as shown in FIGS. 2 (a) and 2 (b), with the horizontal movement of the tray B for transporting the optical disk D into and out of the frame 10, the drive mechanism unit A is rotated around the rear vibration isolating rubber 8b. Move up and down. At the time of loading, as shown in FIG. 2B, the tray B is pulled into the frame 10 by the action of a loading motor (not shown), and at the same time when the loading of the tray B is completed, the tray B is interlocked with the loading motor (not shown) provided in the frame 10. The elevator 12 is raised by the operation of a loading mechanism (not shown). As shown in FIG. 2A, when the chassis 1 is completely lifted, the turntable 3a for mounting the optical disk on the spindle motor 3 and the recess on the lower surface of the clamper 40 engage. A magnet 41 is built in the inside (bottom) of the clamper 40, and when the turntable 3a and the lower surface of the clamper 40 come into contact with each other, the center of the optical disc D is held between them. At this time, the clamper 40 is pushed up by the turntable and is displaced upward in the holding hole 32 of the clamper holder 31.
At the time of unloading, the elevator 12 descends by the action of a loading mechanism (not shown), the clamper 40 and the turntable 3a are separated, and the chassis 1 descends around the rear vibration isolating rubber 8b. Simultaneously with the end of the lowering movement of the chassis 1, the tray B is pulled out of the frame 10 by a loading motor (not shown) (FIG. 2B). The clamper 40 is suspended by a clamper holder 31 fixed to the frame 10 during unloading, lifted up by the turntable 3a raised by loading, with respect to the clamper holder 31, and the clamper 40 is rotated even when the spindle motor 3 rotates. It is designed so that there is a gap so that the clamper holder 31 (the inner peripheral edge of the holding hole 33) does not come into contact with the clamper holder 31.
[0009]
Next, FIGS. 3A and 3B are enlarged cross-sectional views of a clamp mechanism showing a characteristic configuration of one embodiment of the present invention. When the clamper holder 31 is unloaded (when the clamper is suspended by the clamper holder as shown in FIG. 3B), the holding surface 33 for suspending and supporting the flange portion 42 of the clamper 40 is not horizontal but horizontal. Than the predetermined angle θ. This inclination angle θ may be set so that the inclination angle between the clamper 40 and the turntable 3a is about 5 °. At the time of loading, since the upper surface of the turntable 3a and the lower surface of the clamper 40 are in close contact with each other, immediately after the start of unloading, the clamper 40 also descends with the descending movement of the turntable 3a. As the clamper 40 descends, the clamper 40 first contacts the contact point P1 on the holding surface 33. By contacting the contact point P1, the force F ′ required to separate the clamper 40 and the turntable 3a in the subsequent unloading operation becomes F ′ = (x2 / x1) * F according to the leverage principle. Here, F is a clamping force acting between the clamper 40 and the turntable 3a (= force required to cancel the clamped state), x1 is a distance between the support point P2 and the contact point P1, and x2 is a distance between the support point P2 and the clamper 40. Distance to the center of Usually, since the relation x1> x2 is satisfied, F ′> F. That is, when the separating force F is applied, the force F ′ generated at the local contact point P1 acts more than F, so that the separation is facilitated. In the conventional general disk clamp mechanism, F ′ = F because the holding surface 33 is not inclined.
Conventionally, the clamping force has been enhanced in consideration of disturbances such as the eccentricity of the disk, impact, and vibration in response to the speeding up of the rotation of the disk. The force required to separate the turntable 3a from the turntable 3a also increases. This causes a problem that a load is imposed on a loading motor (not shown), and a change to a loading motor having a higher torque leads to an increase in cost. In addition, a large amount of force is required to manually unload at the time of emergency ejection, and the operability is deteriorated.
According to the disk clamp mechanism provided with the clamper holder of the present invention, the force required to separate the clamper 40 from the turntable 3a can be reduced, and the above-described problems can be avoided. (Claim 1)
[0010]
FIG. 4 is a view showing an embodiment according to the present invention, and is a schematic cross-sectional view of a principal part of a disk clamp device provided with a clamper holder of the present invention. A characteristic configuration of the clamper holder 31 according to this embodiment is that a protrusion (step portion) 34 is provided at an appropriate position on the holding surface 33 of the clamper holder 31. When the clamper 40 descends in the holding hole 32 due to the unloading, first, the projection 34 is where the flange portion 42 of the clamper 40 comes into contact with the clamper holder 31. As a result, similarly to the first aspect of the invention, the force for separating the clamper 40 and the turntable 3a is reduced according to the leverage principle, and the load on the loading motor can be reduced. (Claim 2)
The clamper held by the holder 33 may be inclined by providing a recess (a step) instead of the protrusion 34.
In the state where the clamper 40 is suspended and supported by the clamper holder 31 during unloading, the larger the inclination angle between the clamper 40 and the turntable 3a, the more easily the clamper 40 and the turntable 3a can be separated. Since the strength of the magnetic force is inversely proportional to the square of the distance, the influence of this angle is large at the beginning of the unloading operation. As shown in FIG. 2B, the chassis 1 rotates around the rear anti-vibration rubber 8 b and descends by the unloading operation, so that the contact point P 1 is separated from the rear anti-vibration rubber 8 b which is the center of rotation of the chassis 1. If the inclined holding surface 33 or the projection 34 is provided so as to be located on the side of the optical disk drive device, that is, on the front side, the clamper 40 and the turntable 3a can be quickly separated from each other in the initial stage of the unloading operation. Therefore, the load on the loading motor can be reduced, and the operability of emergency ejection can be improved. (Claim 3)
That is, in order to efficiently separate the clamper 40 from the turntable 3a, it is necessary to increase the inclination angle between the turntable and the clamper. For this purpose, when the inclination direction of the turntable at the time of unloading is opposite to the inclination direction of the clamper holder and the clamper, the inclination angle of the clamper holder or the step amount of the protrusion can be reduced. Accordingly, it is possible to prevent the thickness of the clamper holder from being carelessly increased.
In each of the above embodiments, an example is shown in which the holding surface 33 of the clamper holder 31 is provided with an inclined surface or a protrusion (step portion). However, while the holding surface 33 is configured as a flat surface as in the related art, By inclining the flange portion 42 of the clamper 40 in contact with the holding surface, or by providing a projection on a part of the lower surface of the flange portion 42, an effective separating force as shown in FIG. 3 can be applied during unloading. May be configured.
[0011]
【The invention's effect】
As described above, according to the present invention, the clamper holder can be moved when the clamper descends in conjunction with the lowering operation of the spindle motor without forcibly releasing the suction between the clamper and the turntable in conjunction with the discharging operation of the tray holding the optical disk. The flange part for preventing the clamper from dropping against the holding surface of the clamper is made one-sided, and forcibly peeled off from the one-sided part, realizing peeling without applying extraordinary load, thereby reducing the load on the loading motor In addition, it is possible to provide an optical disk drive that can easily perform an emergency ejection.
That is, according to the first aspect of the present invention, the clamper and the clamper holder abut at one point during the initial stage when the spindle motor is lowered during unloading by tilting the holding surface to one side as a whole. Accordingly, the force required to separate the turntable and the clamper can be reduced by the principle of leverage as compared with the case where the turntable is horizontal. For this reason, while reducing the load on the loading motor, the magnet attraction force between the turntable and the clamp can be increased in accordance with the speeding up of the disk rotation.
In the invention according to claim 2, a step portion is provided on a part of the holding surface of the clamper holder.
In order to obtain the same separating effect as in the first aspect of the present invention, a similar separating effect can be obtained by providing a projection on a part of the holding surface.
According to a third aspect of the present invention, when the spindle motor is lowered for unloading, the holding surface of the clamper holder which is in direct contact with the clamper rotates the spindle motor during loading and unloading. It is characterized by being located away from the center.
According to the first and second aspects of the present invention, in order to efficiently separate the clamper from the turntable, the inclination direction of the turntable during unloading is opposite to the inclination direction of the clamper holder and the clamper.
In the invention of claim 4, the inclined surface or the protrusion is formed on the lower surface of the flange portion for preventing the clamper from coming off, which is in contact with the holding surface. While the holding surface is a flat horizontal surface similar to the conventional one, the lower surface of the flange portion on the clamper side in contact with the holding surface is inclined or a projection is provided, thereby obtaining the same effect of reducing the separating force due to the one-side contact. .
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an optical disk drive device provided with an optical disk clamp mechanism according to the present invention.
FIGS. 2A and 2B are cross-sectional views illustrating the operation of the optical disk drive device.
FIGS. 3A and 3B are enlarged cross-sectional views of a main part for explaining the configuration and operation of a portion having a characteristic configuration of the present invention.
FIG. 4 is an enlarged sectional view of a main part of another embodiment.
[Explanation of symbols]
A drive mechanism section, B tray, tray, C case, D optical disk, E clamp mechanism, 1 chassis, 2 optical pickup, 3 spindle motor, 3a turntable, 4 seek rails, 5 seek motor, 8 anti-vibration rubber, 10 Frame, 11 pedestal, 12 elevator, 31 clamper holder, 32 holding hole, 33 holding surface, 40 clamper, 41 permanent magnet, 42 flange, 43 contact part.

Claims (4)

A spindle motor including a turntable for supporting and rotating the optical disk center and rotating vertically between a loading position and an unloading position; and a vertically movable and supported loading device above the turntable. A clamper magnetically attached to the upper surface of the turntable at the position, a holding hole for vertically fitting the clamper, and a holding surface for suspending and holding the clamper by contacting the lower surface of the flange portion for preventing the fall of the clamper. A holder, and an optical disc clamping mechanism for holding the optical disc on the turntable by a magnet attraction force between the turntable and the clamper when the spindle motor moves up to the loading position;
An optical disk drive device having
An optical disk drive device, wherein a holding surface of the clamper holder is inclined with respect to an optical disk surface at a loading position. A spindle motor including a turntable for supporting and rotating the optical disk center portion and configured to be vertically rotatable between a loading position and an unloading position; A clamper magnetically attached to the upper surface of the turntable at the position, a holding hole for vertically fitting the clamper, and a holding surface for suspending and holding the clamper by contacting the lower surface of the flange portion for preventing the fall of the clamper. A holder, and an optical disc clamping mechanism for holding the optical disc on the turntable by a magnet attraction force between the turntable and the clamper when the spindle motor moves up to the loading position;
An optical disk drive device having
An optical disk drive device, wherein a step portion is provided on a part of a holding surface of the clamper holder. When the spindle motor is lowered for unloading, the holding surface of the clamper holder which is in direct contact with the clamper is located at a position distant from the rotation center of the vertical movement of the spindle motor during loading and unloading. 3. The optical disk drive device according to claim 1, wherein: 4. The method according to claim 1, wherein the inclined surface or the protrusion is formed on a lower surface of a flange portion for preventing falling of a clamper in contact with the holding surface, instead of the holding surface of the clamper holder. 5. An optical disk drive device according to claim 1.

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