JPH09297960A - Centering device, motor and optical disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the centering device capable of exhibiting its centering function in supporting a thing to be supported with high accuracy in thin-size at low cost. SOLUTION: An inner ring 31 is engaged and fixed with a rotary shaft, and parts of an outer circumferential part of an outer ring 32 are formed with tapered surfaces 39a respectively, where an optical disk is supported by these tapered surfaces 39a, and the inner ring 31 and the outer ring 32 are connected by connecting parts 33. This centering device is equipped with plural pantagraph links 34, each consisting of one pair of upper and lower links 34a and 34b extending in approximately radial directions of the connecting parts 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk driving device used in an optical disk reproducing device, an optical disk recording / reproducing device, etc., a motor mainly used in this optical disk driving device, and an aligning device mainly used in this motor. .

[0002]

2. Description of the Related Art FIG. 5 shows a motor used in a conventional optical disk drive.

In FIG. 5, reference numeral 51 is a rotary shaft, 52 is a rotor frame, 53 is a rotor magnet, 54 is a bracket, 55 is a bearing, 56 is a stator core, 57 is a winding portion, and 58 is an insulator. Then, the winding portion 57 on the inner side is energized to generate a rotating magnetic field on the stator core 56, thereby rotating the rotor frame 52 on the outer side and rotating the rotating shaft 51 fixed to the rotor frame 52. Has been done.

A turntable 5 is provided on the upper end of the rotary shaft 51.
9 is fixed and the aligning device 60 is attached. The turntable 59 is fitted and fixed to the rotary shaft 51 in the central recess 59a, and the upper surface 59b of the outer peripheral portion thereof serves as a receiving surface for supporting the optical disc A. Aligning device 6
Reference numeral 0 indicates a taper guide 61 that is slidably supported on the rotating shaft 51, a spring 62 that biases the taper guide 61 upward, and a retaining ring 63 that prevents the taper guide 61 from coming out upward. It is configured.

The optical disk A is supported on the receiving surface 59b of the turntable 59, and is sandwiched between the presser board B and the turntable 59 so that the inner peripheral edge a of the optical disk A is in contact with the taper guide 61. , Is rotated by the rotation of the motor.

In this rotation, the center of the rotary shaft 51,
It is required that the center of the optical disc A coincides,
The inner diameter D of the optical disc A is slightly different for each optical disc A. DV formed by sticking two disks together
In the optical disk A for D, a bonding error is added to the molding error, so that it is difficult to match the inner diameters D of all the optical disks A for DVD. Therefore, for the optical disks A having different inner diameters D, the centering device 60 is used in order to support the optical disks A on the receiving surface 59b of the turntable 59 in a state in which the centers thereof coincide with each other. is there.

That is, in the aligning device 60, the taper guide 61 is urged by the spring 62 to move up to a position in contact with the inner peripheral edge a of the optical disc A supported on the receiving surface 59b, so that the radial direction of the optical disc A is increased. Performs the centering function by restraining the movement of. The position of the taper guide 61 with respect to the optical disc A having the large inner diameter D is set higher than the position for the optical disc A having the small inner diameter D so as to absorb the error of the inner diameter D, and to constantly keep the optical disc. The optical disk A is made to rotate with A and the center of the rotation shaft 51 aligned.

[0008]

However, in the above-mentioned conventional example, since the taper guide 61 needs to slide up and down smoothly with respect to the rotary shaft 51, a gap (tolerance) therefor is provided between them. Due to this gap, the concentricity accuracy between the optical disc A and the rotary shaft 51 becomes insufficient, and the taper guide 61 slightly tilts with respect to the rotary shaft 1 to make the optical disc A perpendicular to the rotary shaft 51. There is also a problem that the supporting accuracy on the surface becomes insufficient.

Further, the upper portion of the portion C of the rotary shaft 51 to which the turntable 59 is fixed serves as the guide portion of the taper guide 61, but in order to reduce the inclination of the taper guide 11 with respect to the rotary shaft 1, the length of the guide portion is increased. Since it is necessary to secure the height L equal to or more than a predetermined length, there is a problem that it is difficult to reduce the vertical height of the aligning device 60, and thus the vertical height of the optical disk drive motor.

An object of the present invention is to provide a centering device, a motor and an optical disk drive device which can solve the above problems.

[0011]

In order to achieve the above object, the aligning device of the present invention has one of an inner ring and an outer ring to which a rotary shaft is concentrically mounted, and the other one of which supports a supported object. A centering device in which an inner ring and an outer ring are connected by a connecting portion, wherein the connecting portion includes a plurality of sets of pantograph links each including a pair of upper and lower links extending substantially in a radial direction. And

According to the present invention, since the inner ring and the outer ring are connected by the connecting portion provided with a plurality of sets of pantograph links, each pair of upper and lower links extending substantially in the radial direction, the inner ring is rotated, for example. When the outer ring is supported concentrically on the shaft and the supported object is supported by the outer ring, the outer ring moves smoothly up and down while maintaining parallelism and coaxiality with the inner ring, and with high rigidity against the force from the side direction. Therefore, it supports the object to be supported with high accuracy and exerts a centering function. And according to this invention,
Without adopting the sliding structure as in the conventional example, it is not necessary to provide a guide portion having a predetermined length or more for alignment on the rotary shaft, and it is sufficient to secure only the vertical movement amount of the pantograph link.
The vertical height of the aligning device can be reduced, and a thin aligning device can be provided.

In the above invention, the inner ring is fitted and fixed to the rotary shaft, and the outer peripheral portion of the outer ring has a tapered surface or a curved surface, and the supported object is supported on the tapered surface or the curved surface. According to this structure, it is possible to provide a centering device suitable for an optical disk drive motor that uses an optical disk as a supported object and supports the optical disk on the tapered surface or curved surface.

In the above invention, the inner ring, the outer ring and the link are made of resin, and the connecting portions of the link and the inner ring and the link and the outer ring are thin resin hinges. Then, the centering device can be integrally formed, and the spring in the conventional example is not required, so that the manufacturing cost can be reduced.

In particular, the links on the upper side and the links on the lower side are alternately arranged in the circumferential direction, and the link on the upper side and the link on the lower side adjacent to each other in one circumferential direction of the link. If the structure is such that a pantograph link is formed, resin integral molding becomes easy, a centering device can be configured with one component, and manufacturing costs can be significantly reduced.

On the other hand, the upper links and the lower links are arranged at substantially the same position in the circumferential direction, and the upper link and the lower link at substantially the same position constitute a pantograph link. In terms of structure, an upper unit that is a resin-integrally molded product that consists of an inner ring upper part, an outer ring upper part, and an upper link, and a lower unit that is a resin integrally molded product that consists of an inner ring lower part, an outer ring lower part, and a lower link It is rational to realize this by a structure in which the two are bonded by an adhesive or the like, and two parts are required, but it is excellent in that the centering function is exerted while supporting the supported object with high accuracy.

In the above invention, when the object to be supported is supported by the projection having the tapered surface or the curved surface provided on the outer peripheral portion of the outer ring, the turntable can be assembled compactly as described later. A centering device suitable for an optical disk driving motor can be provided.

The motor of the present invention is characterized by being equipped with the above-mentioned aligning device, and can perform the aligning function while supporting the object to be supported with high accuracy and has a thin aligning function. Since the core device is mounted, the vertical height of the motor itself can be made small.

Particularly, in the present invention, the inner ring is fitted and fixed to the rotary shaft, the outer ring is provided with a plurality of projections, and the projections are formed with tapered surfaces or curved surfaces. The centering device of the invention is mounted, and the turntable is fixed to the rotary shaft at the center thereof, and the projections provided on the outer peripheral portion of the outer ring are exposed to the outside through the openings provided on the turntable. When the motor is configured as described above, the turntable and the aligning device can be assembled compactly with the minimum vertical dimension, and the vertical height of the motor itself can be minimized.

An optical disk drive of the present invention is characterized in that the above-mentioned motor is mounted so that the optical disk can be centered by the above-mentioned centering device by using the optical disk as a supported object. In addition to being able to perform the centering function while being supported with accuracy, the motor having a small vertical height is mounted, so that the structure can be made compact.

[0021]

Embodiments of the present invention will be described with reference to the drawings.

1 and 2 show an optical disk drive motor in an optical disk drive device.

In the figure, 1 is a rotary shaft, 2 is a turntable that also serves as a rotor frame, 13 is a rotor magnet, and 4 is a rotor magnet.
Is a bracket, 5 is a bearing, 6 is a stator core, 7 is a winding portion, 8 is an insulator, and 29 is a disk mounting member.

The turntable 2 is formed by integrally pressing a steel plate by a press, has a boss portion 21 fitted and fixed to the rotary shaft 1 at the center thereof, and has a central top surface portion 22.
Is a convex shape, the ring-shaped disk mounting member 29 is joined to the outer peripheral surface 23 of the top surface, and the outer peripheral edge of the outer peripheral surface 23 of the top surface is bent inward in a folded manner and then hangs downward. The rotor magnet 1 is provided on the inner peripheral surface of the peripheral surface portion 24.
3 are joined to each other, and six openings 25, 25 ... Are provided at intervals of 60 ° in the circumferential direction on the inclined surface at the boundary between the top surface central portion 22 and the top surface outer peripheral portion 23. ,It is configured. In FIG. 2, 26 is the central portion 2 of the top surface.
It is a positioning hole provided in 2.

This optical disk drive motor is configured to rotate the turntable 2 serving also as the rotor frame on the outer side by energizing the winding portion 7 on the inner side to generate a rotating magnetic field in the stator core 6. ing. The turntable 2 is fitted and fixed to the upper end of the rotary shaft 1 by the boss portion 21, and its rotation is supported by the bearing 5 via the rotary shaft 1.

The disk mounting member 29 of the turntable 2
The optical disc A is placed on the upper side of the optical disc A, and the optical disc A is mounted on the lower face of the optical disc A.
The optical disc A is pressure-supported between the disc 1 and the disc mounting member 29. This clamping pressure is given by the magnet attraction force generated between the permanent magnet 10 and the central portion 22 of the top surface of the steel plate turntable 2 and the weight of the holding plate 11.

The optical disk drive motor is provided with a centering device 3 fitted and fixed to the rotary shaft 1 near the upper end of the rotary shaft 1. As shown in FIGS. 3 and 4, the aligning device 3 includes a circular inner ring 31, a circular outer ring 32,
And a connecting portion 3 for connecting the inner ring 31 and the outer ring 32.
3 and 3 are integrally molded with resin. The connecting portion 3
3 includes six links 34a, 34a extending in the radial direction that connect the inner and outer rings 31, 32 at the upper part.
· And six links 34b, 34b extending in the radial direction that connect the inner and outer rings 31, 32 at the bottom
・ It is composed of. The upper links 34a, 34a,
... are arranged at a pitch of 60 ° in the circumferential direction, and the lower links 34b, 34b, ... are also arranged at a pitch of 60 ° in the circumferential direction, but the upper link 34a. On the other hand, the lower links 34b corresponding thereto are arranged at positions displaced by 30 ° in one circumferential direction. That is, the upper links 34a and the lower links 34b are alternately arranged at intervals of 30 ° in the circumferential direction. The corresponding upper link 34a and lower link 34b constitute a pantograph link 34.

The connecting portion 35 between each link 34a, 34b and the inner ring 31, and each link 34a, 34b and the outer ring 3
The second connecting portion 36 is a thin resin hinge, and both connecting portions 35 and 36 of the links 34a and 34b are also used.
The intermediate portion 37 sandwiched between the two is a semicircular thick portion. On the inner circumference of the inner ring 31, there is formed a fitting portion 38 which is fitted to the rotating shaft 1 in a pressure contact state. Further, on the outer peripheral portion of the outer ring 32, six projecting portions 39 projecting in the radial direction are integrally formed at a circumferential position corresponding to the upper link 34a, and the outer surface of each projecting portion 39 is an optical disc. A tapered surface 39a is in contact with the inner peripheral edge a of A. In FIGS. 3 and 4, 40 is the inner ring 31.
Is a positioning projection integrally formed on the upper surface of the turntable 2 and engaging with a positioning hole 26 provided in the turntable 2.

As described above, the centering device 3 of the resin-integrated molded product including the inner and outer rings 31, 32 and the six sets of pantograph links 34 has the center of the top surface of the turntable 2 as shown in FIGS. 1 and 2. So that it contacts the lower surface of the part 22
It is attached to the rotary shaft 1 at the fitting portion 38. At that time, by using the retaining ring 41, the inner ring 31 of the centering device 3
Is pressed against the turntable 2. Further, the protrusions 39 of the aligning device 3 are configured to be exposed to the outside from the openings 25 of the turntable 2 by the circumferential positioning by the engagement of the positioning protrusions 40 and the positioning holes 26. There is.

Next, the operation of the optical disk drive motor having the above structure will be described. When the optical disk A is mounted on the disk mounting member 29 of the turntable 2, the inner peripheral edge a of the optical disk A has protrusions 3 on the outer ring 32 of the centering device 3.
The taper surface 39a of 9 contacts. Since the outer ring 32 is connected to the inner ring 31 by a plurality of sets of pantograph links 34, 34, ..., The outer ring 32 is free to move downward and is located at a position where the optical disc A contacts the disc mounting member 29. Descend to. The descending amount of this outer ring 32 is
It is determined according to the inner diameter of the optical disk A, and even if there is an error in the inner diameter, this can be absorbed by adjusting the descending amount. The tapered surface 39a of each projection 39 serves to align the center of the optical disc A with the center of the rotary shaft 1, and also a plurality of sets of pantograph links 34, 34.
.. maintains the parallelism with the inner ring 31 when the outer ring 32 descends.

The optical disc A is supported by the pressing plate 11 on the turntable 2 in a pressure-sensitive manner. The turntable 2 which also serves as a rotor frame rotates by energization, and the rotation is supported by the bearing 5 via the rotating shaft 1. However, the external force generated during the rotation of the optical disc A, especially the external force in the lateral direction, is generated. Are the tapered surfaces 39a, 39a ...
Through the outer ring 32. However, since the outer ring 32 and the inner ring 31 are connected to each other by a plurality of sets of pantograph links 34, 34, ... It is possible to support the optical disk A without using it.

As described above, the aligning device 3 surely holds the optical disk A on the vertical surface with respect to the rotation axis 1 and contributes to maintain the coaxiality of the optical disk A. Further, the aligning device 3 can be formed thin, and the holding space of the aligning device 3 can be determined by considering only the descending amount of the outer ring 32 with respect to the inner ring 31, so that the vertical dimension of the holding space can be reduced. This contributes to the compactness of the optical disk drive motor. Further, since the centering device 3 of the above-mentioned embodiment can be constituted by an integral resin molded product, it can be manufactured at low cost.

The aligning device of the present invention can be constructed in various modes other than the above-mentioned embodiment. For example, in the above-described embodiment, the upper links 34a and the lower links 34b are alternately arranged in the circumferential direction, but the upper links and the lower links are circumferentially arranged. Placing the pantograph links at the same position in the same direction and linking those at the same position will be even better in achieving the aligning function while supporting the optical disc with high accuracy. . In this case, an upper unit formed by integrally molding the inner ring upper part, the outer ring upper part, and the upper link with a lower unit formed by integrally molding the inner ring lower part, the outer ring lower part, and the lower link by resin is bonded. It is preferable to configure the aligning device by connecting with each other.

Further, in the above-mentioned embodiment, the tapered surface 39a is formed on the protrusion 39, but a curved surface such as a spherical surface may be adopted instead of the tapered surface 39a.

In the above embodiment, the connecting portion is composed of six sets of pantograph links.
The number of sets may be plural, 3 sets, 4 sets, 5
A set, 7 sets, 8 sets, etc. can be selected. When the external force acting on the aligning device is relatively small, it is possible to configure the connecting portion with two sets of pantograph links having a sufficient link width. Further, in the above-described embodiment, the links are arranged so as to extend accurately in the radial direction, but the linking portion may be configured by using links that extend with a slight inclination in the radial direction.

The motor of the present invention can be constructed in various modes other than those shown in the above embodiment. For example, although the above embodiment relates to the motor including the turntable 2 that also serves as the rotor frame, the present invention is applied to a motor in which the rotor frame and the turntable are formed separately as in a normal motor. It is also possible to do so.

When the motor of the present invention is used by incorporating it into a well-known optical disk drive, it is possible to provide an optical disk drive having a compact structure capable of aligning and supporting the optical disk with high accuracy.

[0038]

According to the present invention, it is possible to provide a centering device, a motor and an optical disk drive which are thin and low-cost and which perform a centering function while supporting a supported object with high accuracy.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a motor of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a perspective view showing an embodiment of a centering device of the present invention.

FIG. 4 shows the aligning device, (a) is a plan view thereof,
(B) is the bb line sectional view in (a), (c) is the cc line sectional view in (a).

FIG. 5 is a partially cutaway front view showing a conventional motor.

[Explanation of symbols]

 1 rotary shaft 2 turntable 3 centering device 25 opening 31 inner ring 32 outer ring 33 connecting part 34 pantograph link 34a upper link 34b lower link 35, 36 connecting part (resin hinge) 37 middle part 39 projecting part 39a taper surface

Front page continuation (72) Inventor Shuichi Yamane 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (11)

[Claims] 1. A centering device in which a rotating shaft is concentrically attached to one of an inner ring and an outer ring, a supported object is supported on the other, and an inner ring and an outer ring are connected by a connecting portion. The aligning device is configured by including a plurality of sets of pantograph links each of which has a pair of upper and lower links whose connecting portions extend substantially in the radial direction. 2. An inner ring is fitted and fixed to a rotating shaft, and an outer peripheral portion of the outer ring has a tapered surface or a curved surface, and a supported object is supported by the tapered surface or the curved surface. Item 2. The aligning device according to item 1. 3. The inner ring, the outer ring and the link are made of resin, and the connecting portions of the link and the inner ring and the link and the outer ring are thin resin hinges. Aligning device. 4. The links on the upper side and the links on the lower side are alternately arranged in the circumferential direction, and a link on the upper side and a link on the lower side adjacent to each other in one circumferential direction of the link. The aligning device according to claim 1, 2 or 3, which constitutes a pantograph link. 5. The aligning device according to claim 4, wherein the inner ring, the outer ring and the connecting portion are integrally molded with resin. 6. The upper link and the lower link are arranged at substantially the same position in the circumferential direction, and the upper link and the lower link at substantially the same position constitute a pantograph link. The aligning device according to 1, 2, or 3. 7. An inner ring upper part, an outer ring upper part and an upper link are integrally molded with resin to form an upper unit, and an inner ring lower part, an outer ring lower part and a lower link are integrally molded with resin to form a lower unit. 7. The aligning device according to claim 6, wherein the upper unit and the lower unit are joined together. 8. The aligning device according to claim 2, wherein a plurality of protrusions are provided on the outer peripheral portion of the outer ring, and a tapered surface or a curved surface is formed on these protrusions. 9. A motor having the aligning device according to claim 1, 2, 3, 4, 5, 6, 7 or 8. 10. The centering device according to claim 8 is mounted, and while an inner ring is fitted and fixed to a rotary shaft of a motor, a turntable is fixed to the rotary shaft at a central portion thereof and provided on the turntable. In addition, the motor is configured such that each protrusion provided on the outer peripheral portion of the outer ring is exposed to the outside through each opening. 11. An optical disk drive device, comprising the motor according to claim 9 or 10, wherein the supported object is an optical disk.