JP2003059144A - Motor with disc clamp mechanism - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A disk clamp mechanism that is easy to insert a disk, hard to pull out, and has good stability, and
It is an object of the present invention to provide a motor having a mechanism for facilitating insertion even when the center of a disk and a disk holding ring are misaligned. SOLUTION: A substantially cylindrical disk holding ring 7 for holding an inner diameter portion of a disk 5 and a disk clamp claw 8a.
And a spring 9a for pressing the disk clamp claw 8a in the radial direction so that the disk clamp claw pivots toward the insertion direction of the disk and moves in the direction of the shaft with the insertion of the disk. It is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording apparatus using a disk-shaped medium, and more particularly to a motor having a disk clamp mechanism for clamping and rotating a disk having a hole in the center. .

[0002]

2. Description of the Related Art In an information recording / reproducing apparatus using a disk-shaped medium, a motor having a small size, a thin shape and a high performance is required in accordance with a demand for a small size, a thin shape and a high performance device. In order to realize this, there is a demand for a disc clamp mechanism that is easy to insert a disc, is hard to remove, and is stable against rotation.

As a conventional example, the one described in Japanese Patent Application Laid-Open No. 8-287568 is known.

That is, a turntable having a center hub, a plurality of balls provided in pressure contact with the side surface of the disk center hole, and an elastic member for pressing the balls are provided. , A disc chucking mechanism having an angle so as to press the disc against a turntable is disclosed.

Accordingly, an object of the present invention is to provide a disk chucking mechanism in which the ball efficiently presses the disk.

However, in the disc clamp mechanism described in the above publication, the ball is always urged outward by the elastic member. Therefore, it is always necessary to mount the disc or release or take out the disc against this outward biasing force. Therefore, the insertion force for inserting the disc and the removal force for removing the disc are required to have the same force.

As a result, if the insertion force is reduced to facilitate the insertion, the force for removing the disc is reduced in proportion to the insertion force, and the stability of the disc at high speed rotation deteriorates.

Especially, the tendency of the disc having a bad balance becomes strong.

On the other hand, if the removal force is increased in order to increase the stability of the disk during high-speed rotation, the insertion force also increases, making insertion difficult.

Therefore, the disk clamp mechanism disclosed in the above publication has a problem that the requirements for the ease of inserting the disk and the stability of the disk cannot be satisfied at the same time.

Another conventional example is Japanese Patent Laid-Open No. 58-19.
The one described in Japanese Patent No. 4181 is also known.

That is, a pressing plate, a holder, a steel ball or a pressing member having a spherical surface at the tip, and a spring for urging the pressing member are provided in the holder, and the disk is mounted on the disk mounting portion. At the time of mounting, first the pressing member is pushed in the direction toward the shaft against the spring to pass the disk, and then the returning force of the spring and the inclination formed by the pressing member press the disk downward to push the disk. A disc clamping mechanism configured to clamp is disclosed.

It is described that with such a structure, it is possible to reliably perform centering and mounting when the disc is mounted with a simple structure, and to reduce the size and weight of the entire device.

However, as in the above-described conventional example, the disk is always mounted against the biasing force of the spring, or
The disc must be released or ejected. Therefore, the insertion force for inserting the disc and the removal force for removing the disc are required to have the same force.

As a result, when the insertion force is reduced to facilitate the insertion, the force for removing the disc is reduced in proportion to the insertion force, and the stability of the disc during high speed rotation deteriorates.

[0016] As yet another conventional example, Japanese Patent Laid-Open No. Hei 10-1998
There is one described in Japanese Patent Laid-Open No. 208376.

That is, it has an upper claw and a lower piece which press the inner peripheral edge of the disc from above when the disc is mounted, and has a first position which is a disc mounting position and a second position which is a disc mounting standby position. Between the first and second positions by elastically pressing the holding levers, which are provided at the center of the turntable so as to be able to rotate between A disk chucking mechanism is disclosed that includes a lever holding means for holding and a clamp release mechanism for forcibly rotating the holding lever from the first position to the second position when the disk is attached and detached.

As a result, it is possible to provide a disk chucking mechanism that can chuck the disk on the turntable with a simple structure, reduce the stress applied to the disk when the disk is released, and make the device thinner. Is described.

However, this disc chucking mechanism is provided with an upper claw for pressing the inner peripheral edge of the disc, a clamp arm having a lower piece, a plurality of holding levers, a lever holding means, a clamp releasing mechanism, etc. for the purpose of attaching and detaching the disc. Since it is necessary, there are many components and assembly is complicated.

Further, although the standard thickness of the disk of the CD-ROM, the DVD-ROM, etc. is 1.2 mm,
Thicknesses such as 0.9 mm and 1.4 mm are also standardized. However, in the above-mentioned disc chucking mechanism, it is difficult to clamp discs of different thickness with one type of clamp arm because the upper claw and the lower piece of the clamp arm that clamp the disc are made of one piece. However, there is a problem in that different disc thicknesses cannot be accommodated.

[0021]

As described above, in the information recording / reproducing apparatus using the disk-shaped medium,
With the demand for thin, high-performance devices, motors are also required to be small, thin, and high-performance, so the disk clamp mechanism has a problem to be improved.

The present invention provides a disc clamp mechanism in which the disc can be easily inserted when the disc is mounted while applying an external force, the disc is hard to be removed, and the disc is stable against rotation. It is an object of the present invention to provide a mechanism for facilitating the insertion of a disc even when the disc and the disc holding ring are misaligned.

[0023]

In order to solve the above problems, a motor having a disk clamp mechanism according to the present invention comprises a substantially cylindrical disk holding ring for holding an inner diameter portion of a disk capable of recording and reproducing. Three or more disc clamp pawls housed inside the disc holding ring, a spring that biases the disc clamp pawls in the radial direction, a shaft that defines the center of rotation of the disc holding ring, and the shaft are supported. And a disk clamp mechanism configured to move in a direction toward the shaft while the disk clamp claw rotates toward the disk insertion direction side when the disk is inserted. Is.

In particular, the rotation angle of the disc clamp claw when the disc is inserted is 1 compared with that before the disc is inserted.
It is set to 0 degrees or more.

Further, in order to enhance the effect, the top surface of the disc holding ring is formed with an inclined portion which is inclined toward the outer peripheral direction in the disc insertion direction, and the inclined portion is 70% to 90% of the inner diameter portion of the disc. And the inclination angle of the inclined portion is set in the range of 20 to 30 degrees.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a disk holding ring having a substantially cylindrical shape for holding an inner diameter of a disk capable of recording and reproducing, and a disk holding ring housed inside the disk holding ring. The disk clamp claw, a spring that biases the disk clamp claw in the radial direction, a shaft that defines the center of rotation of the disk holding ring, and a bearing that supports the shaft. The motor is provided with a disc clamp mechanism configured such that the disc clamp claw rotates in the insertion direction side of the disc and moves in the direction toward the shaft upon insertion. As a result, the disc clamp claws rotate in the disc insertion direction as the disc is inserted, and the amount of movement of the claws toward the shaft for completing the disc insertion is reduced. Therefore, the insertion force when inserting the disk can be reduced.

According to a second aspect of the present invention, the rotation angle θ1 of the disc clamp claw when the disc is inserted is set.
Is a motor having the disc clamp mechanism according to claim 1, wherein the angle is 10 degrees or more as compared with before the disc is inserted. Since the tilt angle of rotation of the disc clamp claw is set to 10 degrees or more, the tip of the disc clamp claw moves in the direction toward the shaft by the rotation operation, so that the disc can be inserted without resisting the biasing force of the spring. As a result, it becomes possible to easily insert the disc.

According to a third aspect of the present invention, there is provided a substantially cylindrical disc holding ring for holding an inner diameter portion of a disc capable of recording and reproducing, and three or more disc holding rings accommodated in the disc holding ring. Disc clamp claw, a spring for urging the disc clamp claw in a radial direction, a shaft defining a rotation center of the disc holding ring, and a bearing supporting the shaft, and a top surface portion of the disc holding ring. Has an inclined portion that inclines toward the outer peripheral direction in the disc insertion direction, and the disc clamp claw rotates in the disc insertion direction side as the disc is inserted, and moves in the direction toward the shaft. A motor having a disk clamp mechanism configured to. Since the inclined portion that is inclined toward the outer peripheral direction in the disc insertion direction is formed on the top surface of the disc holding ring,
As the disc is inserted, the disc clamp claws are easily moved in the direction toward the shaft while rotating in the disc insertion direction. This can reduce the insertion force when inserting the disc.

According to a fourth aspect of the present invention, the inclined portion starts from the range of 70% to 90% of the inner diameter of the disk, and the inclined angle of the inclined portion is in the range of 20 to 30 degrees. It is a motor provided with the disk clamp mechanism of Claim 3 characterized by the above-mentioned. By setting the inclined portion formed on the top surface of the disc holding ring within this range, the effect of correcting the misalignment when inserting the disc into the disc holding ring by the inclined portion is secured while maintaining the strength of the inclined portion. be able to.

According to a fifth aspect of the present invention, the rotation angle θ1 of the disc clamp claw at the time of inserting the disc is set.
The motor having the disc clamp mechanism according to claim 4, wherein the angle is 10 degrees or more as compared with before the disc is inserted. As a result, the tip of the disc clamp claw moves in the direction toward the shaft due to the rotational movement, so that the disc can be inserted without resisting the biasing force of the spring, so that the disc can be easily inserted.

[0031]

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

FIG. 1A is a sectional view of a motor according to an embodiment of the present invention. FIG. 1B is a view of the disc holding ring assembly according to the present invention as seen from the back.

1 (a) and 1 (b), a shaft 3 is rotatably inserted in a bearing 2 attached to a bracket assembly 1 serving as a motor base.

A turntable 4 made of pressed iron is attached to one end of the shaft 3. In this embodiment, the turntable 4 is formed integrally with the rotor frame of the motor and also serves as the magnetic path of the rotor magnet.
It may be provided separately from the rotor frame. In this case, the turntable 4 may be made of a non-magnetic material such as brass. A TT cushion 6 for receiving a disc 5 capable of recording and reproducing information is attached to the upper plane of the turntable 4.

A substantially cylindrical disk holding ring assembly 10 for holding the inner diameter portion 15 of the disk 5 is press-fitted or adhered to the turntable 4 by adhesion.

The disc holding ring assembly 10 is composed of three components including a disc holding ring 7, disc clamping pawls 8a, 8b and 8c and springs 9a, 9b and 9c, and serves as a disc clamping mechanism for holding the disc 5 and radially. Plays the function of positioning. The disc holding ring 7 has a disc clamp claw 8a, 8b, 8 inside thereof.
A hole for accommodating c is formed. Then, the disk clamp claws 8a, 8b, 8c are provided with springs 9a,
It is urged radially outward by 9b and 9c. Further, the disk holding ring 7 has a disk clamp claw 8
A plurality of guides 11 are formed radially on both sides of each of a, 8b, and 8c toward the shaft 3.
1, the disc clamp claws 8a, 8b, 8c are slidable in the direction toward the shaft 3.

Further, disk clamp claws 8a, 8b, 8 which are urged radially outward by springs 9a, 9b, 9c.
The disk 5 is pressed against the TT cushion 6 by c.

As a result, even if the disc 5 is rotated at a high speed, it is possible to record and reproduce information on the disc 5 without floating from the TT cushion 6 of the turntable 4. It is possible to stably write and read information by rotating the disc by the motor having the disc clamp mechanism having the above configuration.

FIG. 2A is a sectional view showing the peripheral portion of the disc clamp mechanism according to the embodiment of the present invention.

FIG. 2B is a sectional view showing a state where the disc and the disc holding ring are misaligned in the disc clamp mechanism according to the embodiment of the present invention.

As shown in FIG. 2 (a), the top surface of the disc holding ring 7 has an inclined portion 12 all around. The inclined portion 12 is formed so as to be inclined toward the outer circumference of the disc holding ring 7 in the disc insertion direction.

With this structure, even if the disc 5 and the disc holding ring 7 are misaligned with each other as shown in FIG. 2B, the disc 5 follows the inclined portion 12 to correct the misalignment. Since the centering can be performed in the direction, and the inclined portion 12 facilitates the downward movement, the disc 5 can be easily inserted at the time of misalignment.

Therefore, if the disc 5 is inserted,
Even if the cores of the disc holding ring 7 and the disc holding ring 7 are largely deviated from each other, the inclined portion 12 allows the disc 5 and the disc holding ring 7
This facilitates centering with the disc and facilitates insertion of the disc 5.

Particularly, when the inclination angle θ2 of the inclined portion 12 is set in the range of 20 to 30 degrees, the centering is further facilitated and the disc 5 is easily inserted accordingly. Figure 2
The inclination angle θ2 of the inclined portion 12 in (b) is 25 degrees.

It is suitable that the start of the inclined portion 12 is in the range of 70% to 90% of the inner diameter portion 15 of the disk 5. The beginning of the inclined portion 12 is the inner diameter portion 15 of the disc 5.
If it is larger than 90%, the effect of correcting the misalignment between the disc 5 and the disc holding ring 7 becomes smaller. On the other hand, the start of the inclined portion 12 is 70% of the inner diameter portion 15 of the disc 5.
In the following cases, it is difficult to provide a thin disc clamp mechanism because of the restrictions on the wall thickness t required to secure the strength of the inclined portion, the plate thickness of the disc 5, and the like.

Therefore, by constructing the inclined portion 12 to start in the range of 70% to 90% with respect to the inner diameter portion 15 of the disc 5, the insertion is made thin and small with respect to misalignment of the disc 5. It is possible to provide a motor equipped with a disc clamp mechanism that can be inserted while correcting the displacement by force.

Further, the disc clamp claws 8a, 8b,
A lower curved surface portion 17 is formed on the lower side of 8c, and a protrusion portion 18 is formed on the disk holding ring 7 at a position corresponding to the lower curved surface portion 17 of the disk clamp claws 8a, 8b, 8c. The lower curved surface portion 17 is configured to be rotatable along the protrusion portion 18 of the disc holding ring 7 so as to draw an arc downward. And the protrusion 18
A taper portion 19 is formed on the surface of the lower surface 17 in contact with the lower curved surface portion 17 so as to decrease in the direction from the outer side toward the shaft 3.

The taper portion 19 is provided on the shaft 3 from the outside.
A similar effect can be achieved even with an R shape that becomes lower in the direction toward. As a result, the disc clamp claws 8a, 8b, 8c can smoothly rotate as the disc 5 is inserted.

3A and 3B are side sectional views for explaining the disc mounting process of the disc clamp mechanism of the present invention. FIG. 3A is before the disc mounting, and FIGS. 3B and 3C are the discs. During loading, FIG. 3D shows a state after the disk is loaded.

FIG. 4 is an enlarged partial sectional view of the vicinity of the disc clamp claw of FIGS. 3 (a) to 3 (d).

When the inner diameter portion 15 of the disc 5 starts to be inserted along the inclined portion 12 on the outer periphery of the disc holding ring 7,
As shown in FIG. 3A, the vicinity of the lower end of the inner diameter portion 15 of the disc 5 contacts the upper inclined portion 16 formed above the disc clamp claws 8a, 8b, 8c protruding from the disc holding ring 7. Become.

When the disk 5 is further pressed downward from the contact state of FIG. 3 (a), as shown in FIG. 3 (b), the pressing force causes 8a, 8b, 8c to move downward in the direction of arrow A. Rotate to draw an arc like
It moves in the direction toward the shaft 3 along the guide 11 (not shown) of the disc holding ring 7 against the biasing force of a, 9b, 9c. As a result, the disk 5 is
You can move downward.

The above-mentioned disc mounting process will be described in an enlarged manner in the vicinity of the disc clamp claws with reference to FIG. As the disc clamp claws 8a, 8b, 8c rotate as the disc 5 is inserted as indicated by an arrow A, the claw tip 13 moves in the direction toward the shaft 3. Reference numeral 20 represents the tip of the nail after the movement.

In this way, the disc clamp claws 8a, 8
Since b and 8c rotate and the degree of resisting the biasing force of the springs 9a, 9b and 9c decreases, the insertion force of the disk 5 decreases. Therefore, the disc 5 can be inserted with a small insertion force.

The disk 5 is further inserted downward, and the disk clamp claws 8a, 8b, 8c and the claw tip 13 of the disk clamp claw are in contact with the inner diameter portion 15 of the disk 5 as shown in FIG. 3 (c). ).

The rotation angle θ1 of the disc clamp claws 8a, 8b, 8c is maximum in the state of FIG. 3 (c).
When the turning angle θ1 is 10 degrees or more, the claw tip 13 moves in the direction toward the shaft 3 due to the turning operation.
There is an effect that the insertion can be performed without resisting the springs 9a, 9b, 9c. The rotation angle θ1 is appropriately in the range of 14 degrees to 20 degrees including variations.

Then, as shown in FIG. 3D, the disk 5
By contacting the TT cushion (not shown) of the turntable 4, the disk 5 is supported on the TT cushion (not shown) by the component force of pressing downward the urging force of the disk clamp claws 8a, 8b, 8c.・ Fixed.

[0058]

As described above, according to the present invention, in a motor having a clamp mechanism for clamping a disc while applying an external force to the disc, the disc can be inserted even under adverse conditions in which the disc and the disc holding ring are misaligned. It is possible to realize an excellent motor having a disc clamp mechanism that facilitates the insertion of the disc and that does not easily come off the disc with a structure having a small number of components and easy assembly.

As a result, it is possible to provide an information recording apparatus having higher recording / reproducing reliability than ever before.

In particular, it is possible to provide a motor equipped with a disc clamp mechanism most suitable for slot-in type equipment.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of a motor according to an embodiment of the present invention, and FIG. 1B is a view of a disc clamp mechanism according to the present invention seen from the back side.

FIG. 2A is an external view showing a peripheral portion of a disc clamp mechanism according to an embodiment of the present invention, and FIG. 2B is an external view showing a peripheral portion of a disc clamp mechanism according to an embodiment of the present invention.

FIG. 3 (a) is a side sectional view showing a state before a disc mounting process in the disc clamping mechanism of the present invention (b) is a side sectional view showing a disc mounting process during a disc mounting process in the disc clamping mechanism of the present invention (c). Sectional side view which shows the disk mounting process in the disk mounting process in the disk clamp mechanism of this invention (d) Side sectional view after disk mounting of the disk mounting process in the disk clamp mechanism of this invention.

FIG. 4 is an enlarged partial sectional view of the vicinity of the disc clamp claw of FIGS. 3 (a), (b), (c), and (d).

[Explanation of symbols]

1 Bracket assembly 2 bearings 3 shafts 4 turntable 5 discs 6 TT cushion 7 Disc retaining ring 8a, 8b, 8c Disc clamp claw 9a, 9b, 9c spring 10 Disc retaining ring assembly 11 Guide 12 slope 13 Claw tip 14 Outer diameter 15 Inner diameter 16 Upper slope 17 Lower curved surface 18 Projection 19 Tapered part 20 Claw tip after movement Misalignment between X disc and disc holding ring θ1 Rotation angle of disc clamp claw θ2 Inclination angle of inclined part t Inclined wall thickness

Claims (5)

[Claims] 1. A substantially cylindrical disc holding ring for holding an inner diameter portion of a disc capable of recording and reproducing, three or more disc clamp pawls accommodated in the disc holding ring, and the disc clamp pawl. A spring for urging the disk holding ring in a radial direction, a shaft for defining the center of rotation of the disk holding ring, and a bearing for supporting the shaft,
A motor including a disc clamp mechanism configured such that the disc clamp claw rotates in the disc insertion direction side and moves toward the shaft when the disc is inserted. 2. A motor having a disc clamp mechanism according to claim 1, wherein a rotation angle θ1 of the disc clamp claw when the disc is inserted is 10 degrees or more as compared with that before the disc is inserted. 3. A disc holding ring having a substantially cylindrical shape for holding an inner diameter portion of a disc capable of recording and reproducing, three or more disc clamp pawls housed inside the disc holding ring, and the disc clamp pawl. A spring for urging the disk holding ring in a radial direction, a shaft for defining the center of rotation of the disk holding ring, and a bearing for supporting the shaft,
The top surface portion of the disc holding ring has an inclined portion that is inclined toward the outer peripheral direction in the disc insertion direction, and with the insertion of the disc, the disc clamp claws rotate toward the insertion direction side of the disc, A motor comprising a disc clamp mechanism configured to move in a direction toward the shaft. 4. The sloping portion starts in the range of 70% to 90% of the inner diameter portion of the disk, and the inclination angle of the sloping portion is in the range of 20 to 30 degrees. A motor with a disc clamp mechanism. 5. The motor having a disc clamp mechanism according to claim 4, wherein the rotation angle θ1 of the disc clamp claw when the disc is inserted is 10 degrees or more as compared with that before the disc is inserted.