JPH0349073A - Disk rotating device - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to thin an entire device by doubling a member such as a magnet which constitutes a disk clamp mechanism also as a member such as a rotor magnet which constitutes a disk rotation driving mechanism. CONSTITUTION:A disk D on a turntable 21 is clamped by strongly attracting a magnetic clamp member 26 to the metallic turntable 21, and the center hole of the disk D is guided to the tapered surface 24a of a centering member 24 to be centered. When a current flows in a stator coil 30, the clamp member 26, the turntable 21 and the disk D are driven to be rotated with the mutual action of the current and magnetic field formed among the clamp member 26, a clamp arm 27 and the turntable 21. By thus doubling the rotor magnet constituting a motor also as the attracting member for the clamp as it is, the number of the parts is reduced and the entire device is thinned.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a disc player for playing back a disc on which information is recorded, such as a CD (compact disc), which includes a system for clamping the disc and further rotationally driving the disc. The present invention relates to a disk rotation device that includes both a disk clamp mechanism and a rotation drive mechanism, and particularly to a disk multi-direction device that can realize a thinner overall device while ensuring stable centering of the disk.

[Prior Art 1] FIG. 3 is a sectional view showing a disk rotating device in a conventional CD player.

Reference numeral 1 in the figure indicates a turntable.

This turntable 1 is fixed to and rotationally driven by a rotating shaft 3 of a spindle motor 2 fixed to a chassis (not shown). The turntable 1 has a recess 1a formed in the center, and a centering member 4 is provided within the recess 1a. The centering member 4 is provided so as to be movable in the axial direction within the recess 1a while being biased upward by a spring 5 interposed between the lower surface of the centering member 4 and the turntable l. Further, this centering member 4 is formed with a tapered surface 4a for centering the disk D. The disc D is centered by this tapered surface 4a and placed on the disc mounting portion 1 of the turntable 1.
placed on b. Further, a stopper 4b made of a magnetic material such as metal is fixed to the upper part of the centering member 4.

On the other hand, reference numeral 6 denotes a clamp member that presses the disk D placed on the disk mounting portion 1b from above. This clamp member 6 is lowered by a clamp arm 7 when disc playback starts, and is raised when playback ends.

The clamp member 6 has a support shaft 8 in a hole bored in its center.
is fixed by means such as press fitting. The clamp member 6 is rotatably supported by the clamp arm 7 via this support shaft 8. The outer peripheral side of this clamp member 6 is a disk pressing portion 6 that presses the disk D from above.
It is a. A friction member 9 formed of ring-shaped felt or the like is provided on the lower surface of the disk pressing portion 6a along its outer periphery. A ring-shaped magnet 10 is attached to the support shaft 8 on the lower surface of the central recess of the clamp member 6.
is fixed along the outer periphery of the When the clamp member 6 is lowered by the clamp arm 7, this magnet 10
An attractive force is exerted on the stopper 4b, and the magnet 10, the stopper 4bi3, and the centering member 4 fixed thereto are strongly attracted. As a result, the disk D is strongly pressed by the clamp member 6, and
It is rotationally driven together with the turntable 1i3 and the clamp member 6.

Reference numeral 12 denotes a thrust bearing (for example, a resin sheet) that supports the rotation of the support shaft 8 in the thrust direction.A pivot portion 8a formed into a spherical surface is formed at the portion of the tip of the support shaft 8 that comes into contact with the thrust bearing 12. has been done. This pivot portion 8a is provided to reduce the friction area with the thrust bearing 12 and reduce the load on the spindle motor 2.

[Problems to be Solved by the Invention] In the conventional disk rotating device as described above, the magnet 10 for strongly adhering the disk and the metal centering member 4 are vertically opposed to each other at the center. The thickness dimension of the disc clamp mechanism is quite large. Further, the spindle morph 2 itself, which serves as a rotational drive mechanism for the disk, includes a rotor yoke, a rotor magnet, a stator coil, a stator yoke, etc., and therefore has a considerably large thickness.

Therefore, the thickness of the entire disk rotating device, which combines the conventional disk clamping mechanism and the disk rotating drive mechanism (motor), is extremely large, making it difficult to fully meet the recent demands for thinner devices. The problem was that I couldn't do it.

In addition, as a method for realizing a thinner device based on the configuration of the conventional disk rotating device as described above, for example, the third method is proposed.
Attempts have also been made to reduce the axial dimensions of the recess 1a of the turntable l and the rotating shaft 3 of the centering member 4, but this method does not allow sufficient and stable sliding of the centering member 4 in the axial direction. There was a problem that a stroke could not be obtained and stable centering could not be obtained.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide a disk rotation device that can realize a thinner overall device while ensuring stable centering of the disk.

[Means for Solving the Problems 1] A disk rotating device according to the present invention includes a turntable on which a disk is installed, a clamp member that rotates together with the turntable while pressing the disk in the direction of the turntable, and the clamp. A disk rotating device including a clamp arm that supports a member and moves the clamp member toward and away from a turntable.

One of the turntable and the clamp member has a rotor magnet, and the other includes a magnetic material that is attracted to the rotor magnet with a disk sandwiched therebetween, and the rotor magnet is placed opposite to the rotor magnet. It is characterized in that a stator coil is provided for exerting rotational driving force.

[Function] In the above means, the rotor magnet provided on either the clamp member or the turntable attracts the magnetic material provided on the other, so the disk on the turntable is reliably pressed by the clamp member. be clamped.

Further, the rotor magnet, turntable, disk, and clamp member are rotationally driven by the magnetic field formed by the rotor magnet and a current flowing through a stator coil provided at a position facing the rotor magnet. In other words, the rotor magnet that constitutes the motor is also used as an attraction member for the clamp.

Therefore, the number of magnets is minimized, and the overall thickness of the device can be reduced.

〔Example] The present invention will be described in detail below based on the drawings.

FIG. 1 is a central sectional view of a disk rotating device according to a first embodiment of the present invention.

In the figure, reference numeral 19 is a metal chassis, and 20 is a shaft fixed to the chassis 19 by caulking.

21 has a disk D placed on its upper surface and a radial bearing 2
2 and a metal turntable rotatably supported with respect to the shaft 20 and the chassis 19 by thrust bearings 23; 24 is a centering member for correcting the eccentricity of the disk D placed on the turntable 21; be. This centering member 24 is inserted into the recess 21a of the turntable 21. Moreover, since this centering member 24 is molded from a bearing material (resin material), it is rotatable with respect to the shaft 20. Also, this centering member 24.

It is supported so as to be slidable in the axial direction of the shaft 20 with respect to the outer circumferential surface of the shaft 20 and the inner wall surface of the recess 21a while being biased upward by a spring 25 within the recess 21a. A washer 20a is fixed in a circumferential groove above the shaft 20, and this washer 20a prevents the centering member 24 from moving upward.

This centering member 24 is formed with a tapered surface 24a for centering the disk D.

On the other hand, reference numeral 26 denotes a ring-shaped clamp member that presses the disc D placed on the turntable 21 from above, and in this embodiment, the clamp member 26 is formed of a magnet. Further, reference numeral 28 is a support shaft for supporting the clamp member 26 so as to face the turntable 21.

By fitting the upper end of the shaft 20 into the recess 28a at the lower end of the support shaft 28, the support shaft 28 and the clamp member 26 supported thereon are aligned with the shaft 20 and the turntable 21 supported thereon. is now being carried out. Further, the support shaft 2 is molded from a bearing material (resin material) and press-fitted into the center hole of the clamp member 26. Therefore, the support shaft 28 is integrated with the clamp member 26 in a state where it is fitted to the upper end of the shaft 20.
It can be rotated freely. Also, the clamp member 26
Friction member 2 made of ring-shaped felt etc.
9 is glued.

Further, reference numeral 27 indicates that the clamp member 26 is connected to the turntable 21.
This is a metal clamp arm that is used to move up and down toward and away from the vehicle. The left side of the clamp arm 27 in the figure is connected to a drive mechanism (not shown), so that the clamp arm 27 is rotated in the direction of the arrow α in the figure. The clamp arm 27 has the support shaft 2
8 is inserted and supported, and a thrust bearing (resin seat N27a) for supporting the pivot portion 28b at the upper end of the support shaft 28 is provided.

In this first embodiment, a stator coil 30 is fixed to the lower surface of the clamp arm 27 at a position facing the clamp member 26 via a printed circuit board (not shown). The stator coil 30 is wound in a substantially triangular shape and provided in plural pieces in the circumferential direction, and current flows linearly in the radial direction of the clamp member 26 in the portion of the stator coil 30 indicated by the reference numeral 30a. It has become.

Further, in the clamp member 26 constituting the rotor magnet, the surface facing the stator coil 30 is magnetized alternately with N poles and S poles in the circumferential direction. The clamp member 26 is rotationally driven by the current flowing in the radial direction in the part indicated by the reference numeral 30a of the stator coil 30 and the magnetic pole magnetized by the clamp member 26, which is a rotor magnet, and a so-called brushless morph is configured. There is.

Next, the operation will be explained.

When the disc D is placed on the turntable 21 and the clamp member 26 is lowered by the clamp arm 27,
A clamp member 26 made of a magnet is strongly attracted to the metal turntable 21, and the disk D is clamped. At this time, the center hole of the disk D is aligned with the centering member 2.
The disk D is guided by the tapered surface 24a of No. 4 and centered.

After that, when a current is passed through the stake coil 30 via a printed circuit board (not shown), etc., the current flows between the clamp member 26 as a rotor magnet, the clamp arm 27 as a stator yoke, and the turntable 21 as a rotor yoke. Due to the interaction with the generated magnetic field, the clamp member 26, the turntable 21 and the disk D that are attracted and pressed by the clamp member 26 are rotated, so that a reproduction operation for the disk D is performed.

As described above, according to the first embodiment, the clamp member 26 and the turntable 2 constituting the disc clamp mechanism
1 and clamp arm 27 serve as the rotor magnet, rotor yoke, and stator yoke, which are members of the disk rotation mechanism, respectively, thereby reducing costs by reducing the number of parts and reducing the overall cost of the device. A significant reduction in thickness can be achieved. Furthermore, in this embodiment, the device is made thinner not by reducing the axial dimension of the centering member as in the conventional case, but by using the clamp member 26 as a rotor magnet, which also serves as a rotor magnet. The axial dimensions of the recess 21a of the turntable 21 and the shaft 20 of the centering member 24 can be increased to some extent, and as a result, the centering member 24 can be given a sufficient vertical sliding stroke to perform stable centering. can.

Furthermore, in this embodiment, the shaft 20 inserted into the center of the turntable 21 is fixed to the chassis 19, so that the shaft that positions the center of the turntable rotates as the rotation axis of the spindle motor as in the conventional case. Compared to the conventional case, the center runout of the shaft when the turntable is driven to rotate becomes minute, and the accuracy of disc playback is improved.

Next, FIG. 2 is a central sectional view of a disk rotating device showing a second embodiment of the present invention.

In the figure, parts common to those in FIG. 1 are given the same reference numerals.

In this second embodiment, the clamp member 36 is made of a magnetic material such as metal.

Further, the turntable 31 is made of a non-magnetic material such as synthetic resin. Further, in this embodiment, a ring-shaped magnet 32 is embedded within the turntable 31.

(Alternatively, the turntable 31 and the magnet 32 may be integrally molded using a plastic magnet.) At a position facing the magnet 32, there is a metal support 3 that is caulked and fixed to the chassis 19.
A stator coil 33 is fixed onto the support base 34 via a printed circuit board (not shown). This magnet 32 is a rotor magnet, and the lower surface thereof is magnetized with N poles and S poles alternately in the circumferential direction. Furthermore, the stator coil 33 can exert a motor driving force by the current flowing in the radial direction of the magnet 32.

In this embodiment, when the clamp member 36 is lowered,
The clamp member 36 is strongly attracted to the turntable 31 by the attraction force of the magnet 32. Furthermore, when a current is passed through the stator coil 33 via a printed circuit board (not shown), etc., the interaction between this current and the magnetic field formed between the magnet 32, the metal support 34, and the clamp member 36 causes , magnet 32, turntable 31, disk D, and clamp member 36 are driven to rotate.

That is, in this second embodiment, a disk clamp mechanism is constituted by a clamp member 36, a clamp arm 27, a turntable 31, a magnet 32, and the like. Further, a disk rotation drive mechanism is constituted by a magnet 32 (rotor magnet), a stator coil 33, a support base 34 (stator yoke) i3, a clamp member 36 (rotor yoke), and the like.

Therefore, in this second embodiment, the magnet 32 and clamp member 36 that constitute the disk clamp mechanism function as rotor magnets and rotor yokes as members that constitute the disk rotation drive mechanism. Therefore, this second embodiment can also achieve substantially the same effects as described above with respect to the first embodiment.

In the above-mentioned embodiment, for example, the entire clamp member 26 is made of a magnet, and the entire turntable 21 and clamp arm 27 are made of a magnetic material such as metal (as in the first embodiment). case)
However, the present invention is not limited to this. For example, the clamp member 26, the turntable 21, and the clamp arm 27 may be formed of resin or the like, and then a recess is formed in the clamp member 26 and a magnet is provided in the recess. In addition, a sheet made of a magnetic material such as metal may be adhered to the upper surface of the turntable 21 and the lower surface of the clamp arm 27.

[Effects] As described above, according to the present invention, members such as magnets constituting the disk clamp mechanism are also used as members such as rotor magnets constituting the disk rotation drive mechanism. By reducing the number of parts in the entire device, it is possible to reduce costs and significantly reduce the thickness of the device.

[Brief explanation of drawings]

FIG. 1 is a central sectional view of a disk rotating device according to a first embodiment of the present invention, FIG. 2 is a central sectional view of a disk rotating device showing a second embodiment of the present invention, and FIG. 3 is a conventional CD player. FIG. 2 is a sectional view showing a disk rotating device in FIG. 19...Chassis, 20...Shaft, 21°31
...Turntable, 26.36...Clamp member, 27...Clamp arm, 30.33...Stator coil, 32...Magnet, 34...Support stand. 1F Figure 3

Claims (1)

[Claims] 1. A turntable on which a disk is installed; a clamp member that rotates together with the turntable while pressing the disk toward the turntable; In a disk rotating device, one of the turntable and the clamp member has a rotor magnet, and the other one has a rotor magnet that is attracted to the rotor magnet with the disk sandwiched therebetween. A disk rotating device comprising: a magnetic material containing a magnetic material; and a stator coil facing the rotor magnet and causing the rotor magnet to exert a rotational driving force.