JP2000251361A - Disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a disk driving device capable of miniaturizing and thinning by suppressing the dimension in the axial direction. SOLUTION: A disk holding mechanism and a disk aligning mechanism are provided on a turntable 1. The disk holding mechanism is furnished with a clamp magnet 11 for attracting a clamper arranged at the side of upper surface 13 of the turntable 1. Also, the disk aligning mechanism is arranged so as to provide plural aligning pawls 14 which are disposed on the upper surface 13 of the turntable 1 keeping equal spaces in the peripheral direction and also abutted on the inner peripheral edge 33 of a center hole on the disk D.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, a CD-R
The present invention relates to a disk drive that rotates a disk as an exchange medium such as an OM and a DVD.

[0002]

2. Description of the Related Art In general, as a disk drive device as described above, for example, a device described in Japanese Patent Application Laid-Open No. 10-122251 has been known. That is, as shown in FIG. 7, the conventional disk drive device includes a rotor d through an oil-impregnated sleeve bearing c inside a bearing holder b fixed to a base member a.
The rotatable shaft e is rotatably supported, a turntable f for mounting a disk serving also as a rotor holder is fixed to the rotary shaft e, and a rotor yoke g is fixed to an outer peripheral portion of the rotor holder (turntable f). Further, an annular rotor magnet h is mounted on the inner peripheral surface of the rotor yoke g, and the rotor magnet h is disposed opposite to a stator k externally fixed to the bearing holder b with a slight gap therebetween.

The lower end opening of the bearing holder b is covered with a thrust plate m, and the lower end of the rotating shaft e is connected to the thrust plate m.
Abut on a wear-resistant sheet mounted on the upper surface of the sheet and is supported in a thrust manner. The magnetic center h ′ of the rotor magnet h and the magnetic center k ′ of the stator k are shifted by a predetermined dimension ε in the axial direction, whereby a thrust force acts on the rotor d downward in the axial direction, and the rotating shaft e is It will always contact the thrust plate m.

A yoke o for holding a clamp magnet n is fixed to the upper end of the rotating shaft e, and a yoke o is slidably fitted on the rotating shaft e below the yoke o and is raised by a conical coil spring p. A ring member q biased in the direction is provided. The ring member q has a centering taper surface r formed on the outer periphery thereof. When the disk s is mounted on the turntable f, the inner peripheral edge of the center hole of the disk s abuts on the taper surface r. s
Is aligned, and then the disk s is placed on the turntable f.
The disk s is clamped by magnetically attracting the clamp body t that presses the disk to the clamp magnet n.

A concave groove u is formed on the outer peripheral surface of the upper end of the bearing holder b, and a circular portion and a plurality of claw portions provided at appropriate positions are formed on the lower surface of the turntable f. Is provided, and the claw portion (of the retaining member v) is engaged with the concave circumferential groove u, thereby preventing the rotor d from coming off.

[0006]

However, in the case of this conventional disk drive, the height H in the axial direction of the apparatus itself is controlled by the ring member q and the contact spring p provided for centering the disk s. However, there has been a defect that it has not been possible to respond to recent demands for downsizing and thinning, and that the number of components is large.

An object of the present invention is to provide a turntable itself having a function of holding (clamping and chucking) a disk to have a function of aligning the disk, and to provide a member which slides in the axial direction as in the prior art. The object of the present invention is to eliminate the need for a spring means for biasing the motor, to reduce the axial dimension of the motor itself, and to reduce the size and thickness.

[0008]

In order to achieve the above object, a disk drive according to the present invention comprises a turntable provided with a disk holding mechanism and a disk centering mechanism. As a result, the size of the device (motor) itself in the axial direction is suppressed, and the device can be reduced in size and thickness.

In the disk drive of the present invention,
The disk holding mechanism has a clamp magnet for clamping the clamp body provided on the upper surface side of the turntable, and the disk alignment mechanism is disposed on the upper surface of the turntable at equal intervals in the circumferential direction and has a center hole of the disk. It is provided with a plurality of centering claws in contact with the inner peripheral edge. According to such a configuration, a centering sliding member which is not slidably protruded above the turntable and is slidably attached to the upper end of the rotary shaft and disposed above the turntable, and It is possible to omit a spring for elastically biasing the device upward, thereby achieving a reduction in the size and thickness of the device and an advantage of reducing the number of components.

In the disk drive of the present invention,
The disk holding mechanism is arranged on the upper surface of the turntable at equal intervals in the circumferential direction, and is capable of radially moving back and forth and is urged outward to press the inner circumferential corner of the center hole of the disk toward the turntable. A plurality of chuck claws to be provided, and the disk centering mechanism is provided on the upper surface of the turntable and between the plurality of chuck claws, and a plurality of chucks abut on an inner peripheral edge of a center hole of the disk. It is also possible to provide a centering claw. According to such a configuration, as described above, the centering shaft is not slid out of the turntable, and is slidably attached to the upper end of the shaft to be disposed above the turntable. The sliding member and the spring for urging the sliding member upward can be omitted, so that the size and thickness of the device can be reduced, and the number of parts can be reduced.

Further, the outer surface of the centering claw may have a slope inclined downward in the radial direction. This allows
When the disk is placed on the turntable, the inner peripheral edge of the center hole of the disk is slid and guided on the inclined surface, and the centering claw can reliably contact the inner peripheral edge to align the disk.

Further, the centering claw is formed by forming an approximately U-shaped slit on a turntable, and an elastic tongue piece provided on the turntable.
The elastic tongue may include a claw provided at an inner end thereof, and the elastic tongue may be bent so that the claw can be pivoted in the axial direction. In this way, the centering claw for centering the disk is released in the axial direction downward, and the disk can be surely lowered to the turntable and mounted. In addition, there is an advantage that the structure is simplified by providing the alignment nails integrally with the turntable.

Further, the outer surface of the chuck pawl is formed in a mountain shape with a first inclined portion inclined downward in the radial direction and a second inclined portion inclined downward in the radial direction. Thus, when the disc is placed on the turntable, if the inner peripheral edge of the center hole of the disc is pressed against the first inclined portion, the chuck pawls automatically escape inward in the axial direction to allow the disc to descend. In addition, the disc can be pressed against the turntable side by the second inclined portion and can be retained and retained.

The centering claw is constituted by an elastic tongue piece provided by forming a substantially U-shaped slit in the turntable, and a claw provided at an inner end of the elastic tongue piece. It is also possible to provide a resilient member that allows the claw to swing in the axial direction by bending the elastic tongue, and that holds the elastic tongue from the lower surface of the turntable. In this way, the centering claw for aligning the disk is released in the axial direction downward, the disk can be securely lowered to the turntable and mounted, and deformation of the elastic tongue portion due to creep or the like is prevented. can do.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 shows an embodiment of a disk drive according to the present invention, which rotates a disk as an exchange medium such as a CD-ROM or a DVD. The disk alignment mechanism is provided. FIG. 2 is a plan view of the turntable 1, and FIG. 3 is a bottom view of the turntable 1.

Referring to FIGS. 1 to 3, the disk drive according to the present invention will be described in detail. Reference numeral 2 denotes a base, on which a cylindrical bearing holder 3 is fixed. The rotating shaft 5 is rotatably held inside the oil bearing via an oil-impregnated sleeve bearing 4. A lower end opening of the bearing holder 3 is covered with a thrust plate 32, and a stator 23 including a stator core 22 and a coil 21 wound therearound is provided on the outer periphery of the bearing holder 3. .

The turntable 1 made of plastic is fixed to the upper end of the rotating shaft 5. Note that the upper end of the rotating shaft 5 does not protrude above the turntable 1. The turntable 1 has, at its center, a tubular portion 6 into which the upper end of the rotating shaft 5 is inserted. A thick portion 7 is provided on the outer periphery of the tubular portion 6, and a disk is provided on the outer periphery of the thick portion 7. A flange 8 for mounting D is provided in an outer flange shape.

A rotor yoke 25 is fixed to the lower surface 24 of the turntable 1, and an annular rotor magnet 26 is attached to the inner surface of the outer peripheral wall of the rotor yoke 25. Are arranged to face each other. The rotating shaft 5, the turntable 1, the rotor yoke 25, the rotor magnet 26 and the like constitute a rotor 31. Note that the magnetic center 26a of the rotor magnet 26 and the magnetic center 23a of the stator 23 are shifted by a predetermined dimension ε, whereby a thrust force acts downward on the rotor 31 in the axial direction, and the lower end of the rotating shaft 5 The thrust plate 32 is always in contact with a wear-resistant member or the like.

Incidentally, the disk holding mechanism described above
A clamp magnet 11 is provided on the upper surface 13 of the turntable 1 for attracting a clamp body. That is, the thick portion 7 of the turntable 1 has a tapered surface 12 formed on the outer peripheral edge of the upper end thereof and an annular concave portion 9 formed on the upper surface, and the clamp magnet 11 and the annular yoke 10 9. C is a clamp that presses the disk D against the turntable 1.

The disc centering mechanism includes a plurality of centering claws 14 arranged on the upper surface 13 of the turntable 1 at equal intervals in the circumferential direction. In the present embodiment, the central angle θ of 72 °
Exemplifies a case where five alignment claws 14 are provided. The alignment tongue 14 includes an elastic tongue piece 15 provided in the flange 8 and the thick part 7 of the turntable 1 by forming a substantially U-shaped slit 20 (in plan view), and an elastic tongue piece 15. And a claw 16 provided on the upper surface of the inner end of the tongue, and the claw 16 can be pivoted in the axial direction by bending of the elastic tongue piece 15 due to plastic elasticity.

Further, the outer surface of the claw portion 16 has a slope 17 inclined downward radially outward, and this slope 17 is slightly radially outward from the outer surface 19 of the thick portion 7. positioned. Also,
A slope 18 corresponding to the tapered surface 12 of the thick portion 7 is formed on the upper portion of the slope 17. In addition, the slope 17 of the claw portion 16
Are arc-shaped when viewed in plan.

The elastic tongue piece 15 is formed to be thin and has a relatively low elasticity. This is because if the magnetic force of the clamp magnet 11 is too strong, a large force is required at the time of releasing the clamp, and there is a concern that the entire apparatus becomes large. Therefore, it is desirable to set the clamp force to a small value.
However, if the clamping force is weak, the clamp is easily released by the resilience of the alignment claws 14.
This is because it became necessary to set the resilience of 14 small.

However, when used in a high humidity environment,
The elastic tongue piece 15 of the centering claw 14 absorbs moisture and loses elasticity, which may cause deformation due to creep or the like. As a countermeasure, an upward elastic force can be applied to each of the elastic tongue pieces 15 by an elastic member 27 such as a conical spring. Specifically, a resilient member 27 is interposed between the inner flange portion 28 provided at the upper end of the rotor yoke 25 and the lower surface 24 of the turntable 1 at a position corresponding to each of the elastic tongue pieces 15. .
As a result, deformation of each of the elastic tongue pieces 15 (by creep or the like) is prevented. The resilient member 27 does not cause the turntable 1 to float. As can be seen from FIGS. 1 and 3, the resilient member 27 is formed by connecting the inner flange 28 integrally connected to the lower surface 24 of the turntable 1. Although the compression force is always compressed, the resilient force is held by the lower surface 24 (the resilient force does not act in the free state of the aligning claw 14). An upward elastic force acts only when the is deformed downward. Thus, the resilient member 27 does not increase the axial height H of the device. The resilient member
As 27, a leaf spring (for example, an annular shape) can be used other than the conical spring.

A concave circumferential groove 29 is formed on the outer peripheral surface of the upper end of the bearing holder 3, and a plurality of locking claws 30 project from the lower surface 24 of the turntable 1 at equal intervals in the circumferential direction. The locking claws 30 are engaged with the concave peripheral grooves 29 to prevent the rotor 31 from coming off.

When the disk D is mounted on the disk drive, the inner peripheral edge 33 of the center hole of the disk D slides down along the slope 17 of the claw portion 16 of each centering claw 14, and each claw 14 Department
16 contact the inner peripheral edge 33 to perform centering (centering) of the disk D. At this time, each elastic tongue piece 15 pressed downward by the disc D via each claw section 16.
Are bent downward, whereby the claws 16 slightly swing downward in the axial direction and escape, so that the disk D can surely descend to the turntable 1. On the other hand, the clamp body C descended from above the turntable 1
Is attracted and held by the clamp magnet 11, and an annular non-slip member provided on the upper surface of the flange 8 of the turntable 1.
The disk D is held between the clamp 34 and the clamp body C. When power is supplied to the coils 21 in this state, the turntable 1, the disk D, and the clamp body C rotate integrally.

Next, FIG. 4 shows another embodiment of the present invention. This disk drive device comprises a turntable 1 having a disk holding mechanism and a disk centering mechanism. A plurality of chuck claws 35 arranged at regular intervals in the circumferential direction on the upper surface 13 of the turntable 1 and capable of moving back and forth in the radial direction and being elastically urged outward.
The disc centering mechanism is provided on the upper surface 13 of the turntable 1.
And a plurality of centering claws 14 (described above) disposed between the plurality of chuck claws 35.

FIG. 5 is a plan view of the turntable 1.
FIG. 6 is a plan view of a rotor 31 having a chuck case 36 (described later), chuck claws 35, and the like attached to the upper surface 13 of the turntable 1.

The disk drive will now be described in detail with reference to FIGS. 4 to 6. The turntable 1 comprises a cylindrical portion 6 for inserting the upper end of the rotating shaft 5 and a cylindrical portion 6 And an outer collar-shaped flange 8 provided at the lower end of the plurality of centering claws at a predetermined center angle θ.
14 ... are provided. In the present embodiment, an example is shown in which three alignment claws 14 are provided at a central angle θ of 120 °.

That is, the centering claw 14 includes an elastic tongue piece 15 provided by forming a substantially U-shaped slit 20 in the flange 8,
And a claw portion 16 provided on the upper surface of the inner end of the elastic tongue piece portion 15, and an outer surface of the claw portion 16 has a gradient surface 17 inclined downward in the radial direction.
Is provided. Also, the slope 17 is a chuck case.
It is located slightly outward in the radial direction from the outer side surface 46 of the and has an arc shape when viewed in plan. In this case,
The elastic tongue piece 15 is set to a thickness such that elasticity is not lost even when used in a high humidity environment.

The chuck case 36 has a short tube portion 37 fitted externally to the tube portion 6 of the turntable 1 and an upper wall provided in an outer flange shape radially outward from the upper end of the short tube portion 37. Part 38,
Having an outer peripheral wall portion 39 vertically provided from an outer peripheral edge of the upper wall portion 38,
A plurality of notches 40 are provided in the outer peripheral wall portion 39 at positions corresponding to the respective centering claws 14 so as not to interfere with the centering claws 14. Further, three chuck claw insertion notches 41 are formed at a center angle θ of 120 ° on the outer peripheral wall 39 between the plurality of notches 40. The vertical dimension of the chuck case 36 is set to be substantially equal to the projection size of the cylindrical portion 6 of the turntable 1 and the upper end of the rotating shaft 5 is prevented from projecting above the cylindrical portion 6.

The chuck claw 35 has a first inclined portion 43 whose outer surface is inclined downward in the radial direction and a second inclined portion 43 whose inner surface is inclined downward in the radial direction.
It is formed in a mountain shape with the inclined portion 44, and a small convex portion 45 is provided at the inner end thereof. And this small convex part 45
However, the notch 41 of the chuck case 36
The chuck pawl 35 is inserted inside (between the upper wall portion 38 and the upper surface 13 of the turntable 1) so as to be able to advance and retreat in the radial direction.
Are attached to the chuck case 36. A resilient member 42 such as a coil spring is provided between the short cylindrical portion 37 of the chuck case 36 and the chuck claw 35 to urge the chuck claw 35 radially outward. In addition, as shown in FIG. 1 of JP-A-8-335351, for example, as shown in FIG. This is realized by contacting both side edges of the notch 40 for inserting the chuck pawl 36.

When the disk D is installed in the disk drive, the inner peripheral edge 33 of the center hole of the disk D presses the first inclined portion 43 of the chuck claw 35 so that the chuck claw 35 moves inward in the radial direction. The inner peripheral edge 33 slides down the first inclined portion 43, and the inner peripheral edge 33 is
When it gets over the claw top between the inclined portions 43 and 44, the chuck claw 35
Is moved outward, and the inner peripheral corner of the center hole of the disk D (the upper peripheral corner of the inner peripheral edge 33) is turned at the second inclined portion 44 by the turntable 1.
Pressed to the side. That is, the disc D is retained and held by the chuck claws 35. At this time, the disk D
The inner peripheral edge 33 of the disk D slides down along the slope 17 of the claw portion 16 of the centering claw 14, and the center of the disk D is performed by the abutment of each claw portion 16 on the inner peripheral edge 33. . When power is supplied to the coils 21 of the stators 23 in this state, the turntable 1 and the disk D rotate integrally.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, in the embodiment described with reference to FIGS. 14
The number of the centering claws 14 and the number of the chuck claws 35 can be respectively set to three to four or six or more at equal intervals in the circumferential direction. In the embodiment described with reference to FIGS. It can be four or more.

[0035]

According to the present invention, a CD-ROM or a DVD
Since the turntable 1 itself on which a disk as an exchange medium is mounted has a disk holding function and a disk centering function, the height H of the device (motor) in the axial direction can be reliably reduced. That is, as in the conventional apparatus shown in FIG. 7, the rotating shaft e is protruded above the turntable f, and the clamp magnet n, the yoke o holding the clamp magnet n, and the centering ring member q are placed above the turntable f. There is no need to arrange them. Therefore, the disk drive of the present invention can be reduced in size and thickness, and can meet the demand for reduction in size and thickness of the device using the disk drive. Further, according to the present invention, the centering ring member q and the coil spring p for biasing the ring member q upward provided in the conventional device (shown in FIG. 7) can be omitted, and the number of parts can be reduced. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention.

FIG. 2 is a plan view of a turntable.

FIG. 3 is a bottom view of the turntable.

FIG. 4 is a cross-sectional view showing another embodiment.

FIG. 5 is a plan view of a turntable.

FIG. 6 is a plan view of a rotor.

FIG. 7 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Turntable 11 Clamp magnet 13 Upper surface 14 Centering claw 15 Elastic tongue piece 16 Claw 17 Slope 20 Slit 27 Resilient member 33 Inner peripheral edge 35 Chuck claw 43 First inclined portion 44 Second inclined portion D disk

Claims (7)

[Claims] 1. A disk drive device comprising a turntable provided with a disk holding mechanism and a disk alignment mechanism. 2. A disk drive device comprising a turntable provided with a disk holding mechanism and a disk centering mechanism, wherein the disk holding mechanism includes a clamp magnet for holding a clamp body provided on an upper surface of the turntable. A disk drive, wherein the disk alignment mechanism is provided on the upper surface of the turntable at equal circumferential intervals and includes a plurality of alignment pawls abutting on an inner peripheral edge of a center hole of the disk. apparatus. 3. A disk drive device comprising a turntable provided with a disk holding mechanism and a disk centering mechanism, wherein the disk holding mechanisms are arranged on a top surface of the turntable at equal intervals in a circumferential direction and in a radial direction. The disk centering mechanism is provided on the upper surface of the turntable with a plurality of chuck claws which are urged outward and outward to urge the inner peripheral corner of the center hole of the disk toward the turntable. And a plurality of centering claws disposed between the plurality of chuck claws and in contact with an inner peripheral edge of a center hole of the disc. 4. The disk drive device according to claim 2, wherein the outer surface of the centering claw has a slope inclined downward radially outward. 5. An alignment tongue comprising: an elastic tongue portion provided by forming a substantially U-shaped slit in a turntable; and a claw portion provided at an inner end of the elastic tongue portion. 5. The disk drive device according to claim 2, wherein said claw portion is swingable in an axial direction by bending of said elastic tongue piece portion. 6. The outer surface of the chuck claw is formed in a mountain shape with a first inclined portion inclined downward in the radial direction and a second inclined portion inclined downward in the radial direction. 6. The disk drive according to 4 or 5. 7. The centering claw comprises an elastic tongue portion provided on the turntable by forming a substantially U-shaped slit, and a claw portion provided at an inner end of the elastic tongue portion. 5. The elastic member according to claim 2, wherein said claw portion is swingable in the axial direction by bending of said elastic tongue portion, and a resilient member for holding said elastic tongue portion from a lower surface of said turntable is provided. Disk drive.