JP2004171651A - Disk clamping mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk clamping mechanism enabling the structure thereof to be simplified when an aligning mechanism is provided. <P>SOLUTION: The disk clamping mechanism has an aligning recess 13b disposed in the rotational center of a turntable 13, an aligning mechanism arranged to be moved in the rotational axis direction of a clamper 3 in the rotational center thereof, and an elastic member (compression coil spring 36) for pressing the clamper 3 toward the turntable 13. After the clamper 3 is moved to abut on a disk 2 by a clamper holding member 31, the clamper holding member 31 is moved toward the turntable 13 to compress the elastic member. The aligning member 34 is moved together with the clamper holding member 31 toward the turntable 13, and projected from the clamper 3 toward the turntable 13 by the compression of the elastic member to engage with an aligning recess 13b. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disk clamping mechanism.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various types of clamp mechanisms have been disclosed which hold down a disc on a turntable by a clamper when a disc mounted on the turntable is rotationally driven (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2000-298904 A (FIGS. 11 and 12)
[0004]
In the conventional clamping mechanism disclosed in Patent Document 1, a turntable provided with a centering mechanism is fixed to a rotating shaft of a motor, and when a disk is loaded, an operation lever comes into contact with the disk, and the operation lever rotates with the rotation of the operation lever. As a result, the centering protrusion rises from the turntable and engages with the engaging portion formed on the clamper.
[0005]
[Problems to be solved by the invention]
However, the conventional clamping mechanism having the above-described centering mechanism has a problem that the operation of the centering mechanism is complicated, so that the structure is complicated and the number of parts is increased.
[0006]
Further, in order to reduce the thickness of a disk device or the like, when a cup-shaped rotary yoke is provided on a rotor as a disk drive motor and the rotary yoke also serves as a turntable, a complicated structure like the above-described conventional clamp mechanism is required. It is difficult to incorporate the centering mechanism having the configuration into the clamp mechanism while keeping the apparatus thin. That is, in the case where the rotary yoke also serves as a turntable, if a centering mechanism in a conventional clamp mechanism is employed, it becomes necessary to provide a centering mechanism inside the motor, and the configuration of the motor becomes complicated. For this reason, it becomes difficult to improve the assembly accuracy of the motor.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a disk clamping mechanism that can simplify the configuration provided with an alignment mechanism in view of the above-described problems.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a turntable provided on a rotor of a disk drive motor, a clamper disposed to face the turntable, and a clamper holding member that holds the clamper in a rotatable state. In a disk clamping mechanism in which the clamper is moved by the clamper holding member in the direction of the turntable and the loaded disk is sandwiched between the clamper and the turntable, a centering recess provided at the rotation center of the turntable An alignment member movably disposed in the rotation axis direction of the clamper at the rotation center of the clamper, and an elastic member for urging the clamper in the direction of the turntable, wherein the elastic member is provided by the clamper holding member. Is moved and comes into contact with the disc, and then the clamper holding member moves further in the direction of the turntable. Moving, the centering member moves in the direction of the turntable together with the clamper holding member, and projects from the clamper toward the turntable by the compression of the elastic member so as to engage with the centering recess. It is.
[0009]
According to another aspect of the present invention, in the above-described disc clamping mechanism, when the tip of the alignment member is not in contact with the disc, the tip of the alignment member is flush with the contact portion of the clamper, or viewed from the turntable. It is located farther than the contact portion of the clamper.
[0010]
According to another aspect of the invention, in any one of the above-described disk clamping mechanisms, the turntable is formed as a part of a rotor of the disk drive motor.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a disk clamping mechanism according to an embodiment of the present invention will be described in detail with reference to FIGS.
[0012]
1 and 2 are cross-sectional views showing a configuration of a disk clamping mechanism according to an embodiment of the present invention. FIG. 1 is a cross-sectional view showing a state before loading and after ejection (before loading and after unloading) of the disk, and FIG. 2 shows a state after loading (after loading) the disk and being chucked. FIG.
[0013]
As shown in FIGS. 1 and 2, the disk clamping mechanism according to the present embodiment is disposed so as to face a turntable 13 formed as a part of a rotor 21 of the disk drive motor 1 and the turntable 13. The turntable 13 and the clamper 3 sandwich the disk 2 that has been loaded in the direction of arrow X in FIG. 1 by a disk loading mechanism (not shown).
[0014]
The disk drive motor 1 includes a stator 11, a rotor 21, and a turntable 13 provided integrally with the rotor 21. The stator 11 includes a stator substrate 14, a coil mounting portion 15 fitted and fixed to the stator substrate 14, a coil winding portion 16 mounted on the outer periphery of the coil mounting portion 15, and a coil wound around the coil winding portion 16. And a radial bearing 18.
[0015]
The stator substrate 14 is formed of a plate-shaped member, and has an insertion hole 14a at a predetermined position. An end of the bottomed cylindrical coil mounting portion 15 on the bottom side is fitted into and fixed to the insertion hole 14a.
[0016]
A step portion 15a is formed on the outer peripheral surface of the coil mounting portion 15, and an inner peripheral end portion of the coil winding portion 16 is placed and fixed on the step portion 15a. A coil 17 is wound around the coil winding section 16. In addition, a thrust bearing 23 that receives the rotating shaft 22 of the rotor 21 in the axial direction is disposed at a bottom inside the coil mounting portion 15. A radial bearing 18 that receives the rotation of the rotating shaft 22 in the radial direction is disposed on the inner periphery of the coil mounting portion 15.
[0017]
The rotor 21 includes a rotating shaft 22 rotatably disposed inside the coil mounting portion 15 of the stator 11, a cup-shaped rotor yoke 24 inserted and fixed near one end of the rotating shaft 22, and an inner peripheral wall of the rotor yoke 24. And a driving magnet 25 attached to the peripheral surface. A disk pad 26 is provided on the outer peripheral edge of the upper surface of the rotor yoke 24 so that the lower surface of the disk 2 abuts when the disk 2 is chucked.
[0018]
The turntable 13 includes an upper surface 29 of the rotor yoke 24 and a center member 30 attached to the center of the upper surface 29. The center member 30 is a member that enters the hole 2a formed at the center of the disk 2 loaded on the outer peripheral surface. The diameter of the center member 30 is configured to be slightly smaller than the diameter of the hole 2 a of the disk 2. A tapered surface 13c is formed on the outer peripheral edge portion on the upper surface side of the center member 30 so that the disk 2 can be easily inserted.
[0019]
The center member 30 is placed and fixed on the upper surface 29 of the rotor yoke 24. A concave portion 13a is formed on the lower surface of the center member 30, and a convex portion 24a formed on the upper surface 29 of the rotor yoke 24 is engaged in the concave portion 13a. An insertion hole is provided at the center of rotation of the center member 30, and one end side of the rotating shaft 22 is inserted and fixed in the insertion hole by, for example, press fitting.
[0020]
One end of the rotating shaft 22 is inserted into the insertion hole, and further projects into a concave portion 13 b formed on the upper surface of the center member 30. The recess 13b formed at the center of rotation of the upper surface of the center member 30 is a centering recess into which a centering member 34 of a centering mechanism 33 described later enters. An upper portion (entrance portion) of the recess 13b is provided with a tapered surface 13d serving as a guide for guiding the alignment member 34.
[0021]
The disk drive motor 1 configured as described above operates when electric power is supplied, and the rotor 21 integrally provided with the turntable 13 rotates about the rotation shaft 22 as a rotation center.
[0022]
The clamper 3 is a member for chucking the disc 2 loaded in the arrow X direction with respect to the turntable 13. The clamper 3 is rotatably held by the clamper holding member 31 below the clamper holding member 31, and can be moved in the vertical direction in FIGS. 1 and 2 within a predetermined range not restricted by the clamper holding member 31. Has become.
[0023]
The center portion of the clamper 3 has a shape that is curved upward corresponding to the shape of the center member 30 that is disposed to face the same. On the lower surface of the curved portion of the clamper 3, an annular center pressing portion 4 that contacts the upper surface of the center member 30 when the clamper 3 descends (chucks).
[0024]
An annular disk pressing member 5 is arranged on the lower surface near the outer peripheral end of the clamper 3. The disc holding portion 5 contacts the upper surface of the chucked disc 2.
[0025]
The cylindrical portion 35 of the alignment member 34 is inserted through the center of rotation of the clamper 3. The upper end of the alignment member 34 is rotatably locked to the lower surface of the clamper holding member 31. The centering member 34 is prevented from falling off in the vertical direction with respect to the clamper holding member 31 and moves up and down integrally with the clamper holding member 31. It is rotatable. Further, the clamper 3 can be moved in the vertical direction relatively to the centering member 34 and the clamper holding member 31. Further, near the outer peripheral end of the clamper 3, a contact portion 37 which is in contact with and supported by the clamper holding member 31 during non-chucking is formed.
[0026]
The alignment member 34 of the alignment mechanism 33 engages with the concave portion 13b of the turntable 13 during chucking. As a result, the clamper 3 is positioned with respect to the turntable 13 such that the center of rotation thereof coincides with the center of rotation of the rotor 21. Then, the clamper 3 rotates integrally with the alignment member 34, the turntable 13 and the disk 2.
[0027]
The clamper holding member 31 is fixed to a clamper driving mechanism (not shown), and pivots about a fulcrum (not shown) in the vertical direction in FIGS. 1 and 2.
[0028]
The clamper driving mechanism operates to lower the clamper holding member 31 when the disk 2 is loaded in the arrow X direction to a predetermined position. In addition, when an instruction signal for canceling the loading (that is, unloading) is input, an operation is performed to raise the clamper holding member 31.
[0029]
Next, a detailed configuration of the centering mechanism 33 will be described.
[0030]
The alignment mechanism 33 includes an alignment member 34 having an upper end connected to the lower surface of the clamper holding member 31, a concave portion 13 b provided at the rotation center of the turntable 13, and an inner portion of the cylindrical portion 35 of the alignment member 34. And a compression coil spring 36 which is an elastic member disposed in the cavity.
[0031]
The cylindrical portion 35 of the alignment member 34 has a cylindrical shape, and the lower end portion of the alignment member 34 is formed in a tapered shape such that the radius thereof decreases downward. The centering member 34 is engaged with the recess 13b serving as the centering recess of the turntable 13 when the clamper 3 is lowered.
[0032]
During this engagement, the tapered surface 34c at the lower end of the alignment member 34 comes into contact with the tapered surface 13d formed above the recess 13b of the turntable 13, and the alignment member 34 enters the recess 13b. .
[0033]
The two tapered surfaces 34c and 13d serve as guides for guiding the center of the alignment member 34 to the center of the recess 13b.
[0034]
The compression coil spring 36 is disposed between the clamper 3 and the clamper holding member 31. The upper end of the cylindrical portion 35 of the alignment member 34 may be closed, and the upper end of the compression coil spring 36 may be fixed to the inner surface of the closed upper end of the cylindrical portion 35. The compression coil spring 36 urges the clamper 3 downward. In the state after loading shown in FIG. 2, the compression coil spring 36 is compressed more than in the state before loading (FIG. 1), and the compression spring 36 lowers the clamper 3 with a larger force. Is energizing.
[0035]
Next, a clamp operation (chucking operation) and an unclamping operation (chucking release operation) of the disk clamping mechanism according to the embodiment of the present invention will be described.
[0036]
First, before the disk 2 is loaded, each part of the clamp mechanism of the present embodiment is at a position as shown in FIG. In this state, the lower end of the alignment member 34 is disposed on the same plane as the lower end of the clamper 3 (the lower ends of the center pressing portion 4 and the disk pressing portion 5) or above the lower end of the clamper 3. W1 between the turntable 13 and the turntable 13 is equal to or larger than the gap between the clamper 3 and the turntable 13. The gap W1 is larger than the thickness of the disk 2 and has a sufficient distance for the disk 2 to advance.
[0037]
Then, for example, by operating a predetermined switch (not shown), the disk loading mechanism is activated, and the disk 2 is transported (loaded) in the direction of arrow X in FIG. Then, the loaded disk 2 proceeds between the clamper 3 and the turntable 13. At this time, the loaded disk 2 passes through a gap W1 between the alignment member 34 and the center member 30 of the turntable 13.
[0038]
When the disc 2 moves to a predetermined position in the direction of arrow X by a disc loading mechanism (not shown), the disc 2 descends and is placed on the turntable 13. At this time, the center member 30 of the turntable 13 is inserted into the hole 2a of the disk 2. On the other hand, the clamper holding member 31 is lowered by the clamper driving mechanism, and the centering member 34 and the clamper 3 are also lowered accordingly.
[0039]
By the operation of the clamper driving mechanism, first, the center pressing portion 4 of the clamper 3 comes into contact with the upper surface of the turntable 13 and the disk pressing portion 5 comes into contact with the upper surface of the disk 2. , Descend further. Even after the contact, the clamper holding member 31 descends, but since the clamper 3 is in contact with the turntable 13 and the disk 2, the clamper 3 is restricted by them and does not descend any further. Accordingly, the compression coil spring 36 is compressed, and the alignment member 34 protrudes from the lower end of the clamper 3. At this time, the centering member 34 projects below the clamper 3 by the compression dimension of the compression coil spring 36.
[0040]
Therefore, the alignment member 34 of the alignment mechanism 33 enters the recess 13 b of the turntable 13. Thereby, the rotation center of the clamper 3 is positioned with respect to the rotation center of the turntable 13. The clamper 3 is urged toward the disk 2 by receiving the restoring force of the compression coil spring 36, and chucks the disk 2 with respect to the turntable 13 in a suitable state.
[0041]
Thereafter, when, for example, an instruction signal of “play” is input, the disk drive motor 1 starts operating by receiving power supply, and the rotor 21 rotates together with the turntable 13. Thereby, the disk 2, the clamper 3, and the alignment mechanism 33 also rotate integrally with the rotor 21. When the reproduction of the disk 2 is stopped, the disk 2 is clamped without rotating.
[0042]
Thus, the disk 2 is clamped by the clamp mechanism according to the present embodiment.
[0043]
Next, when, for example, a command signal of “eject” is input in a state where the disk 2 is clamped, a clamper driving mechanism (not shown) raises the clamper holding member 31. When the clamper holding member 31 rises, the alignment member 34 also rises accordingly. As the clamper holding member 31 rises, the compressed coil spring 36 that has been compressed gradually expands, and the amount of protrusion of the alignment member 34 decreases.
[0044]
When the clamper holding member 31 rises to a predetermined position, the contact portion 37 of the clamper 3 receives the contact of the clamper holding member 31. With the clamper holding member 31 in contact with the contact portion 37 of the clamper 3, the tip of the alignment member 34 is positioned at the same height as the lower end of the clamper 3 or above it.
[0045]
After the clamper holding member 31 contacts the contact portion 37 of the clamper 3, the clamper holding member 31 further continues to ascend, and pulls up the clamper 3 and the alignment member 34. As a result, the disc 2 is released from chucking by the clamper 3, and a sufficient clearance is obtained between the clamper 3 and the turntable 13. Thereafter, the disc loading mechanism operates to convey the disc 2 in a direction opposite to the loading direction, so that the disc 2 is conveyed in a direction opposite to the arrow X direction in FIG.
[0046]
As described above, the clamp mechanism according to the above-described embodiment includes the recess 13 b provided at the rotation center of the turntable 13 and the centering member movably disposed in the rotation axis direction of the clamper 3 at the rotation center of the clamper 3. 34, and a compression coil spring 36 for urging the clamper 3 toward the turntable 13. After the clamper 3 is moved by the clamper holding member 31 and abuts on the disk 2, the compression coil spring 36 is compressed by further moving the clamper holding member 31 in the direction of the turntable 13. On the other hand, the centering member 34 moves in the direction of the turntable 13 together with the clamper holding member 31, and projects from the clamper 3 toward the turntable 13 by the compression of the compression coil spring 36 and engages with the recess 13b.
[0047]
Thereby, since the movement directions of the clamper holding member 31 and the alignment member 34 match, the operation of the alignment mechanism 33 is simplified, and the configuration of the clamp mechanism provided with the alignment mechanism 33 can be simplified. it can. Further, since the alignment member 34 which is a movable member of the alignment mechanism 33 is provided on the clamper 3 side, the structure on the turntable 13 side is simplified, and the design and assembly of the disk drive motor 1 can be performed with high accuracy. It will be easier. In addition, the vertical movement amount of the clamper 3 is smaller than the vertical movement amount of the alignment member 34. Therefore, it is possible to effectively utilize the space above the clamper 3 such as disposing a board, a switch, and the like. Further, in the present embodiment, since the alignment member 34 which is a movable member of the alignment mechanism 33 is provided on the clamper 3 side, the turntable 13 can be efficiently rotated without receiving a large load from the clamper 3 side. can do.
[0048]
In the clamp mechanism of the above-described embodiment, when the tip of the alignment member 34 is not in contact with the disc 2, the tip of the centering member 34 is flush with the contact portion of the clamper 3 or viewed from the turntable 2. Therefore, even if the alignment mechanism 33 is provided, the clearance between the clamper 3 and the turntable 13 can be sufficiently secured while keeping the apparatus thin.
[0049]
The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, the elastic member is the compression coil spring 36, but another type of compressible elastic member such as rubber or a spring having another shape may be used.
[0050]
In the above-described embodiment, the center member 30 is fixed to the upper surface 29 of the rotor 21. However, the disk loading center member 30 may be formed integrally with the rotor yoke 24.
[0051]
【The invention's effect】
As described above, according to the present invention, the configuration of the clamp mechanism provided with the alignment mechanism can be simplified.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state before loading (after unloading) a disk in a disk clamping mechanism according to an embodiment of the present invention.
FIG. 2 is a sectional view showing a state after loading (during chucking) of the disk in the disk clamping mechanism according to the embodiment of the present invention.
[Explanation of symbols]
1 disk drive motor 2 disk 3 clamper 13 turntable 13b recess (recess for alignment)
24 rotor 31 clamper holding member 34 alignment member 36 compression coil spring (elastic member)

Claims (3)

A turntable provided on a rotor of the disk drive motor, a clamper disposed opposite to the turntable, and a clamper holding member for holding the clamper in a rotatable state; By moving the clamper in the direction of the turntable, a disc clamping mechanism for clamping the loaded disc between the clamper and the turntable,
A centering recess provided at the rotation center of the turntable, a centering member movably arranged in the rotation axis direction of the clamper at the center of rotation of the clamper, and the clamper attached to the direction of the turntable. And an elastic member that urges,
The elastic member is compressed by moving the clamper by the clamper holding member and abutting on the disc, and further moving the clamper holding member in the direction of the turntable,
The alignment member moves in the direction of the turntable together with the clamper holding member, and projects in the direction of the turntable from the clamper by compression of the elastic member to engage with the alignment recess.
A disk clamping mechanism. The tip of the alignment member is located on the same plane as the contact portion of the clamper or farther from the contact portion of the clamper when viewed from the turntable when the clamper is not in contact with the disk. 2. The disk clamping mechanism according to claim 1, wherein 2. The disk clamping mechanism according to claim 1, wherein the turntable is formed as a part of a rotor of the disk drive motor.

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