JP2008112502A - Disk chuck device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk chuck device which has small number of parts, is easy to assemble and can surely hold a disk. <P>SOLUTION: The disk chucking device is provided with a hub 3 secured to a center part of a turntable 18 and an elastic plate 4 housed in the hub. The hub 3 has a window part 33 through which the outer circumferential part of the hub are opened partially, and a supporting part 35 supporting a region of the elastic plate 4. The elastic plate 4 has a leaf spring part 41 elastically deformed to a concave shape and a convex shape, and is formed with: a projection piece 42 continued from the leaf spring part 41 and supported by the supporting part 35; and a movable pawl 43 arranged at a position of the window part 33. The movable pawl 43 has a trigger part 43a and a disk pressurizing part 43b. The trigger part 43a is projected more outward than an outer diameter-region S of the hub 3 so as to convert the leaf spring part 41 from the concave shape to the convex shape, when the leaf spring part 41 is converted to the convex shape, the disk pressurizing part 43b is projected more outward than the outer diameter-region S of the hub 3 and pressurizes an inner circumferential edge of a disk D to the turntable 18 side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disk chucking apparatus that holds a disk-shaped recording medium (disk) such as a CD, a CD-ROM, or a DVD on a turntable.

  In recent years, in connection with the growing need for thinning digital audio-visual equipment such as notebook PCs and DVD recorders, the disk drive installed in these equipments must also be thin to increase the speed of recording and playback. It has been.

  A high holding force is indispensable for securely holding a disk rotated at high speed. To realize this, claws that move radially from the center of the turntable on which the disk is placed are provided radially. The mainstream method is to press the center of the disc with a nail.

  An example thereof will be described with reference to FIG. 10. T is a turntable, and a hub H that fits in a central hole of a disk (not shown) is provided at the center thereof. In the hub H, window portions W formed by cutting out the outer peripheral portion thereof are formed at equal intervals in the circumferential direction. A claw member P1 is disposed at the position of the window portion W, and the claw member P1 is formed by a coil spring Cs. The hub H is biased in the radial direction. According to the disk chucking device, when the disk is placed on the turntable T and the center hole is fitted to the hub H, the claw member P1 is pushed by the disk and is immersed in the hub H. This is pushed by the coil spring Cs and moves in the radial direction of the hub H from the window portion W, so that the inner peripheral edge of the disc can be pressed against the turntable T side.

  However, in the chucking device as described above, when the disk is held, the claw member P1 moves over the inner peripheral edge of the disk and slides to the outer peripheral side. Therefore, depending on the surface roughness of the claw member P1 and the disk, There is a possibility that the member P1 is caught on the inner peripheral edge of the disk, and the disk is not held and is detached from the hub H during rotation.

  In addition, since the same number of coil springs Cs are required as corresponding to the plurality of claw members P1, there are problems that the number of parts is large and the cost is high, and that the assembly is troublesome.

  Accordingly, an elastic arm Ea extending like a cantilever is connected to the outer periphery of the annular base portion Rb as shown in FIG. 11, and an engaging claw P2 that engages the tip of the elastic arm Ea with the inner peripheral edge of the disk. A chucking device has been proposed in which a locking claw P2 protrudes and protrudes from a window portion (opening) of a hub (not shown) (for example, Patent Document 1).

JP 2006-120300 A

  However, as in the chucking device shown in FIG. 10, Patent Document 1 also has a locking claw P <b> 2 that moves over the inner peripheral edge of the disk and slides to the outer peripheral side when holding the disk. Depending on the surface roughness or the like, the locking claw P2 may be caught on the inner peripheral edge of the disc, and the disc may not be held and may come off the hub during rotation.

  Further, since the latching pawl P2 is urged from the inner peripheral side to the outer peripheral side by the elasticity of the elastic arm Ea, there is a problem that it is difficult to obtain a pressing force for firmly pressing the disc against the turntable.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide a chucking apparatus that has a small number of parts and is easy to assemble so that the disk can be held securely.

In order to achieve the above object, the present invention provides a disk chucking device for detachably holding a disk mounted on a turntable 18 and having a hole in the center.
An elastic plate 4 provided at the center of the turntable 18;
The elastic plate 4 is formed with a leaf spring portion 41 that is elastically deformed into a concave shape close to the turntable 18 and a convex shape separated from the turntable 18, and a movable claw 43 that is continuous with the leaf spring portion 41.
The movable claw 43 is
A trigger portion 43a that protrudes outward from the center hole of the disk D in a direction close to the turntable 18 to convert the leaf spring portion 41 from the concave shape to the convex shape;
When the trigger portion 43a is pressed by the disk D in the direction away from the turntable 18 and the leaf spring portion 41 is converted to the convex shape, the disk D protrudes outward from the center hole of the disk D and moves to the inside of the disk D. A disc pressing portion 43b that presses the periphery toward the turntable 18;
It is characterized by having.

In addition, the hub 3 that accommodates the elastic plate 4 is fixed to the center of the turntable 18.
The hub 3 has a window portion 33 formed at predetermined intervals in the circumferential direction by partially opening the outer peripheral portion thereof, and a support portion (locking groove 35) for supporting a portion of the elastic plate 4,
The leaf spring portion 41 is formed with a projecting piece 42 supported by a support portion (locking groove 35).
The movable nail | claw 43 is arrange | positioned at the window part 33, It is characterized by the above-mentioned.

  Since the disk chucking device according to the present invention is composed of two members, an elastic plate, preferably an elastic plate and a hub for housing the elastic plate, the number of components is small and assembly can be easily performed.

  Further, the elastic plate has a leaf spring portion that elastically deforms into a concave shape close to the turntable and a convex shape spaced apart from the turntable, and this elastically deforms into a convex shape, so that the disc pressing portion becomes the inner peripheral edge of the disc. Since the disc is pressed against the turntable, the disc can be firmly held with a high holding force.

  Further, since the disc pressing portion swings in the thickness direction of the disc in conjunction with the elastic deformation of the leaf spring portion, the disc can be attached and detached without sliding the disc pressing portion with respect to the disc. For this reason, the disc is hardly damaged, and the inner periphery of the disc can be reliably held when the disc is mounted.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In FIG. 1, 1 is a disk drive motor, 2 is a disk chucking apparatus according to the present invention, and the disk chucking apparatus 2 is integrally assembled with the disk drive motor 1 to constitute a disk drive apparatus. To do.

  First, a configuration example of the disk drive motor 1 will be briefly described with reference to FIG. 1. Reference numeral 11 denotes a motor base constituting a stator, and a bearing holder 12 is fixed at the center of the motor base. A cylindrical bearing 13 is fitted to the front. A stator core 14 is fixed to the outer periphery of the bearing holder 12, and an armature winding is wound around the stator core 14 to form a stator coil 15.

  On the other hand, a rotor shaft 16 is rotatably supported in the bearing 13, and a boss portion 17 is provided at one end thereof, and a turntable 18 having a concave cross section constituting the rotor is fixed to the boss portion 17. .

  The turntable 18 is a disk-shaped recording medium (disk) such as a CD or DVD that is rotated together with the disk. A field magnet 19 is mounted on the inner wall of the outer periphery in the vicinity of the salient pole of the stator core 14. Is done.

  The turntable 18 is rotated by the magnetic flux of the field magnet 19 acting on the rotating magnetic field generated by passing a drive current through the stator coil 15.

  Next, the disc chucking device 2 will be described. The disc chucking device 2 is for centering and holding the disc placed on the turntable 18, which is concentric with the turntable 18. Placed in.

  Hereinafter, the configuration of the disc chucking device 2 will be described in detail. FIG. 2 is a plan view of the chucking device, and FIG. 3 shows an XX enlarged cross section of FIG.

  As is clear from FIGS. 2 and 3, the chucking device 2 is configured by accommodating an elastic plate 4 in the hub 3. Of these, the hub 3 has a disk-shaped top plate portion 31 having a mounting hole 31a at the center portion and a circular cross-sectional shape having an annular peripheral wall portion 32 connected to the periphery thereof, and the outer diameter of the hub 3 is to be maintained. Therefore, the hub 3 can be fitted into the center hole of the disk so that the disk can be centered.

  In particular, in the hub 3, window portions 33 are formed at predetermined intervals in the circumferential direction from the top plate portion 31 to the peripheral wall portion 32. The window 33 is formed by partially cutting and opening the outer peripheral portion of the hub 3, and in this example, three windows 33 are formed at intervals of 120 degrees. A plurality of window portions 33 may be formed at a predetermined interval, for example, two at 180 ° intervals, four at 90 ° intervals, five at 72 ° intervals, or six at 60 ° intervals. You may form at intervals.

  3 and 4, the window portion 33 is not opened on the peripheral wall portion 32 side, and the end portion on the peripheral wall portion 32 side is closed by an arc-shaped rib 34 that remains integral with the hub 3. Yes. According to this, the elastic plate 4 accommodated in the hub 3 can be prevented from being deformed such that the diameter of the peripheral wall portion 32 is enlarged by the elasticity of the elastic plate 4.

  As is clear from FIG. 4, a locking groove 35 (a support portion for supporting a projecting piece described later) is formed on the inner peripheral side of the peripheral wall portion 32 on the top plate portion 31 side of the rib 34. .

  FIG. 5 shows a cross section of the hub 3 at the position of the locking groove 35. As is apparent from this figure, a pair of left and right side walls 36 are formed on the inner peripheral side of the peripheral wall portion 32 with the window portion 33 interposed therebetween. The locking groove 35 is formed on the side wall 36.

  On the other hand, the elastic plate 4 is formed by bending a plate material having a spring property such as spring steel, and this includes a plate spring portion 41, a projecting piece 42 formed continuously therewith and a movable piece as shown in FIG. Claws 43. The leaf spring portion 41 is composed of an annular portion 41a having a circular hole in the center and three arm portions 41b extending radially from the annular portion, and a movable claw 43 is integrally formed at the tip of each arm portion 41b. Yes.

  The movable claw 43 includes a small piece of trigger part 43a formed by bending the tip of the arm part 41b into an L shape, and a small piece of disk pressing part obtained by bending the tip of the arm part 41b to the opposite side of the trigger part 43a. 3b, and the entire movable claw 43 has a U-shape as viewed from the side as shown in FIG. 3, and a gap larger than the thickness of the disc is formed between the trigger portion 43a and the disc pressing portion 43b. .

  The projecting pieces 42 are a pair of left and right small pieces that are in the same plane as the arm portion 41b and project from both side edges of the arm portion 41b. The projecting pieces 42 are supported by the locking grooves 35 described above. It has become so.

  FIG. 7 shows a state in which the projecting piece 42 is supported by the locking groove 35 (support portion). As is apparent from this figure, the movable claw 43 is disposed at the position of the window 33 of the hub 3, and in this state, the projecting piece 42 is fitted and supported in the locking groove 35, and the locking groove 35. The movement of the movable claw 43 with respect to the radial direction of the hub 3 is restricted by the projecting piece 42 fitted in. The movable claw 43 swings in the vertical direction (the direction perpendicular to the plane of the turntable 18 described above and the same as the disc mounting / removing direction) with the protruding piece 42 fitted in the locking groove 35 as a fulcrum. In conjunction with this, the plate spring portion 41 is bent in the vertical direction with the protruding piece 42 as a fulcrum (FIG. 3 shows a concave elastic deformation in which the plate spring portion 41 is bent downward before holding the disk. Status).

  In particular, the trigger portion 43a constituting the movable claw 43 protrudes outward from the outer diameter inner region of the hub 3 (a circular region inside the peripheral wall portion 32 and the same as the central hole region of the disc) and waits for the disc ( At this time, the disc pressing portion 43b is positioned in the inner diameter outer region of the hub 3 so as not to obstruct the fitting between the disc and the hub 3.

  Here, the operation of the disk chucking device configured as described above will be described. FIG. 8 shows a state before holding a disk (disk not loaded), and FIG. Is shown.

  As is apparent from these drawings, the hub 3 is fixed to the center portion (boss portion 17) so as to be concentric with the turntable 18. Then, when the disc is not mounted as shown in FIG. 8, the leaf spring portion 41 of the elastic plate 4 is bent in a direction approaching the turntable 18 and elastically deformed into a concave shape as described above. The movable claw 43 protrudes outwardly from the outer diameter inner region S (the center hole of the disc) of the hub 3 in the direction in which the trigger portion 43a is closer to the turntable 18 than the projecting piece 42 and presses the disc. The portion 43 b is located in the outer diameter inner region S of the hub 3 in a direction away from the turntable 18 than the projecting piece 42.

  In the state as described above, when the center hole of the disk D is fitted to the outer periphery of the hub 3 in order to place the disk D on the turntable 18, the trigger portion 43 a is caused by the inner peripheral edge (edge of the center hole) of the disk D. By being pressed, the leaf spring portion 41 is converted from a concave shape into a convex shape as shown in FIG. 9 (an elastic deformation mode curved in a direction away from the turntable 18) by the reaction force.

  Accordingly, the movable claw 43 as a whole swings downward toward the turntable 18, and the disk pressing portion 43 b located in the outer diameter inner area S of the hub 3 protrudes outward from the area S so that the inner periphery of the disk D is formed. Press toward the turntable 18 side. For this reason, the disk D is firmly held on the turntable 18 by pressing of the inner peripheral part (three places in this example) by the disk pressing part 43b.

  On the other hand, when removing the disk D, the disk D may be lifted away from the turntable 18 against the elasticity of the elastic plate 4, but a convex leaf spring may be formed by inserting a fingertip into the window 33 or the like. The portion 41 may be pressed to the turntable 18 side, and in either case, the elastic plate 4 is returned from the state of FIG. 9 to the state of FIG. The disk D can be removed by pushing up.

  8 and 9, reference numeral 18a denotes an annular friction material fixed on the turntable 18 so as to prevent the disk from slipping. Reference numeral 18b denotes an annular recess in which the inner peripheral side of the turntable 18 is dug down one step at the mounting portion of the disc chucking device 2 of the present application so as not to disturb the swinging of the movable claw 43.

  Although the best mode of the present invention has been described above, the present apparatus can be used for various disk drive devices such as a DVD recorder and a CD player incorporated in a personal computer or the like. In the above example, the disk drive motor 1 is of the outer rotor type, and the turntable 18 constitutes the rotor portion of the motor 1. However, the disk drive motor 1 is an inner rotor type spindle motor. For example, the turntable may be fixed to the rotor shaft, and the chucking device 2 of the present application can be mounted on such a turntable.

1 is an exploded view of a disk drive device equipped with a disk chucking device according to the present invention. Plan view of a disk chucking apparatus according to the present invention XX expanded sectional view of FIG. The perspective view which shows the window part formed in a hub Cross section of hub Top view of elastic plate Partial enlarged sectional view of the disk chucking device according to the present invention Operation explanatory diagram of disc chucking according to the present invention (when no disc is loaded) Operation explanatory diagram of disk chucking according to the present invention (when a disk is loaded) Partial enlarged sectional view showing a conventional device Configuration diagram showing another conventional apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc drive motor 2 Disc chucking device 3 Hub 4 Elastic board 18 Turntable 33 Window part 35 Locking groove (support part)
41 leaf spring part 42 projecting piece 43 movable claw 43a trigger part 43b disk pressing part

Claims (2)

In a disc chucking device that is placed on a turntable and holds a disc having a hole in the center in a detachable manner,
Comprising an elastic plate provided at the center of the turntable;
The elastic plate is formed with a leaf spring portion that elastically deforms into a concave shape close to the turntable and a convex shape spaced apart from the turntable, and a movable claw that is continuous with the leaf spring portion,
The movable nail is
A trigger portion that protrudes outward from a central hole of the disk in a direction close to the turntable to convert the leaf spring portion from the concave shape to the convex shape;
When the trigger portion is pressed by the disc and the leaf spring portion is converted into the convex shape in a direction away from the turntable, the outer peripheral edge of the disc protrudes outward from the center hole of the disc. A disk pressing portion that presses the turntable side,
A disk chucking device comprising: A hub that accommodates the elastic plate is fixed to the center of the turntable,
The hub has a window portion formed at predetermined intervals in the circumferential direction by partially opening the outer peripheral portion thereof, and a support portion for supporting a portion of the elastic plate,
The leaf spring part is formed with a projecting piece supported by the support part,
The disk chucking device according to claim 1, wherein the movable claw is disposed in the window portion.

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