JP2001351292A - Disk-chucking mechanism, and recording and reproducing device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk-chucking mechanism that can readily remove a disk and the number of components for removal is not drastically increased. SOLUTION: A centering member 7, a disk holding member 8 and a regulating member 9 are provided in the disk-chucking mechanism 3 provided with a turntable 6 to place the disk 2. The centering member 7 for the disk 2 is pressed by the disk at disk loading, to be shifted in a direction along the rotary shaft of the turntable 6. Then, the disk-holding member 8 has a function for holding the disk 2 between the centering member 7 and it by being brought into contact with the peripheral edge of center hole 2a of the disk 2, after position regulation is released with the shifting of the centering member 7. The regulating member 9 is supported shiftably in the direction along the rotary shaft of the turntable 6, and even though although it regulates shifting of the disk-holding member at chucking completion, it pushes at the time of the removal of the disk 2, and the regulation is released.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk chucking mechanism for mounting / holding and rotating a disk-shaped recording medium and a recording / reproducing apparatus using the same for facilitating removal of the disk. About technology.

[0002]

2. Description of the Related Art In a device for recording and reproducing information using a disk-shaped recording medium, a chucking mechanism for the recording medium is provided. For example, a ball-type chucking mechanism or a disk holding claw is provided. Various chucking mechanisms used (for example, a configuration in which a plurality of claw members biased in a centrifugal direction in a centrifugal direction at predetermined angular intervals around a rotation axis can obtain a holding force in a disk radial direction, or the like) .)It has been known.

[0003]

However, the conventional apparatus has the following problems.

In the conventional chucking mechanism, when the disk is taken out, the disk is lifted,
At that time, it is necessary to apply a force sufficient to release the disc chucking (that is, an external force that overcomes a spring force or an elastic force that gives a holding force at the time of the disc chucking). In the worst case, if added, the disk may be deformed.

In order to increase the reading speed of the disk, it is necessary to increase the frictional force in order to increase the holding force on the disk, and it is necessary to increase the urging force such as a spring force. For example, when the spring force is increased in a configuration in which the holding force in the radial direction of the disc is defined by three claw members and a spring member connected to the claw members, the claw members move during disc chucking. This makes it difficult to mount the disk on the turntable, or in the worst case, the disk may be cracked due to excessive force. In order to avoid such inconvenience, for example, it is conceivable to provide a mechanism for releasing the holding force of the disk during disk chucking.
Therefore, there is a problem that if the configuration becomes complicated, the number of parts must be significantly increased.

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to take out a disk without difficulty in a disk chucking mechanism and to prevent the number of parts and the number of assembling steps from significantly increasing.

[0007]

SUMMARY OF THE INVENTION The present invention has the following components to solve the above-mentioned problems.

A turntable on which a disc is placed;

Provided for centering the disc, supported by the turntable in a state where the disc is pressed by the disc and can move in the direction along the rotation axis of the turntable when the disc is mounted, and in the direction away from the turntable. A biased centering member.

The turntable can be moved between a first position that does not contact the periphery of the center hole of the disk and a second position that contacts and holds the periphery of the center hole of the disk. A disk holding member that is supported and releases the position regulation with the movement of the centering member and moves to the second position to hold the disk with the centering member.

A regulating member which is supported so as to be movable in a direction along the rotation axis of the turntable, and which regulates the movement of the disk holding member when chucking is completed.

Therefore, according to the present invention, the disc holding by the disc holding member and the centering member is released by moving the regulating member to release the restriction on the movement of the disc holding member, so that the disc can be easily taken out. In addition, when the disc is mounted, the centering member is pressed by the disc and moved in the direction along the rotation axis of the turntable, so that excessive force is not applied to the disc or the device at the time of mounting. it can.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically shows a main part of the structure of a recording / reproducing apparatus 1 and a disk 2.
, A disc chucking mechanism 3 and an optical head device 4.

The disk 2 includes an optically readable disk such as a compact disk (CD), a magneto-optical disk, a phase change disk, and the like. A center hole is formed at the center of the disk. All of the disc-shaped recording media are included in the applicable range. In addition, the recording / reproducing device 1
In addition to a device dedicated to reproduction or recording, a device capable of both reproduction and recording is included, and the usage of the device may be stationary or portable.

The disk chucking mechanism 3 is a turntable (or a disk table or a clamper) as a rotary mounting member for mounting a disk and rotating the disk with the power of a driving source (a spindle motor 5 is shown in the figure). , A spindle hub, etc.), and a holding member for holding a disk between the centering member and the centering member as described later.

The optical head device 4 is used for reproducing information recorded on the disk 2 (optical pickup in a narrow sense) or for recording information on the disk 2, and includes a lens including an objective lens 4a. The system includes a system, a light source, a light detection unit (such as a photodetector), a focus and tracking control mechanism, and the like.

FIGS. 2 and 3 are diagrams for explaining the basic configuration of the disc chucking mechanism 3. FIG.
FIG. 3 shows a plan view, and FIG. 3 shows the rotation axis with the center line (this is referred to as “C”) for easy understanding in describing the chucking operation.
L ". ) Shows the state when the disc is mounted on the left half, and shows the state when chucking is completed on the right half.

The disc chucking mechanism 3 has the following components (the numbers in parentheses indicate the signs).

Turntable (6) Centering member (7) Disc holding member (8) Regulatory member (9)

As for the turntable 6, the motor 10
(See FIG. 3), a motor shaft 10a is press-fitted to the central cylindrical portion 6a so as to be rotated. In the illustrated configuration, the turntable 6 is composed of a disk mounting portion 6b and a rotor case 6c, and a buffer member is provided at a portion of the disk mounting portion 6b near the outer peripheral edge of the surface on which the disk 2 is mounted. An annular rubber sheet 6d is stuck. The motor 10 is attached to and supported by the chassis 11.

The centering member 7 is provided for centering (centering the disk 2) of the disk 2 so that the disk 2 is not rotated in an eccentric state with respect to the rotation center axis (the center axis of the motor shaft). It is to prevent. The centering member 7 is received in the recess 12 formed in the disk mounting portion 6b of the turntable 6 so that the centering member 7 is pressed by the disk when the disk is mounted and is moved in the direction along the rotation axis of the turntable 6. I have. In addition, the disc mounting portion 6b and the centering member 7
Are biased upward in the figure by a biasing means 13 (a coil spring having an outer shape of a truncated cone is shown in the figure) provided between them. A slant surface 7a is formed on the outer peripheral edge of the centering member 7, and the inner peripheral edge of the center hole 2a of the disk 2 comes into contact with the inclined surface 7a.

As shown in the right side of FIG. 3, the disk holding member 8 is a member necessary for holding the disk 2 with the centering member 7 when chucking is completed.
As shown in FIG. 2, in this example, three disk holding members 8, 8, 8 are provided at an angular interval of 120 ° around the rotation center axis of the turntable 6, and the center hole 2a of the disk 2 is provided. Is held at three points, which is the most preferable form from the viewpoint of the number of parts. However, as far as the present invention is concerned, the number and arrangement of the disk holding members are not limited.

As shown in the left half of FIG. 3, the disk holding member 8 has a first position where it does not contact the periphery of the center hole 2a of the disk 2 and the right half of FIG. As described above, the disk 2 is supported by the turntable 6 so as to be movable over a second position where the disk 2 comes into contact with and holds the peripheral edge of the center hole 2a. That is, in the illustrated configuration, the claw 8a is formed on the disk holding member 8, but this claw 8a does not contact the disk 2 at the first position, and the center hole 2a is The inner peripheral edge of the center hole 2a is in contact with the slope 7a of the centering member 7. In the second position, the claw portion 8a is moved in a direction away from the rotation center axis of the turntable 6 so that (the edge portion of the center hole 2a of the disc 2) is located between the claw portion 8a and the centering member 7.
Is pinched.

The movement of the disk holding member 8 to the second position (including tilting, rotation, etc.) is accompanied by the movement of the centering member 7 (movement in the direction along the rotation center axis). This is performed when the position regulation on the disk holding member 8 is released. That is, in the illustrated configuration, the end 8b of the disk holding member 8 opposite to the side on which the claw portion 8a is provided is rotatably mounted in the recess 12 of the turntable 6 (turn). The connecting portion with the table 6 has a pivot point.) The position of the disk holding member 8 is regulated by a hole 7 formed in the centering member 7.
b, cam portions 14 and 1 formed on the inner peripheral surface (position regulating surface)
It is released at the maximum radial positions of 4, 14 (see FIG. 2). These cam portions are connected to a rotation center shaft (motor shaft 10a).
Are formed at an angular interval of 120 ° around the center axis of the motor shaft 10a, and a portion of the inner peripheral surface of the hole 7b of the centering member 7 where the cam portion 14 is formed and a rotation center axis (the center axis of the motor shaft 10a). ) Is longer than the distance between the portion where the cam portion 14 is not formed and the rotation center axis (that is, the diameter of the hole 7b is the largest in the cam portion 14 and the other portions are the same). It is smaller than this.)

Therefore, as shown on the left side of FIG. 3, when the disk holding member 8 is in contact with the inner peripheral surface of the hole 7b (the portion having the minimum radius where the cam portion 14 is not formed),
Although the disk holding member 8 is restricted to the motor shaft 10a side so as not to approach the center hole 2a of the disk 2,
Since the centering member 7 rotates and the disk holding member 8 is located at a position corresponding to the maximum radius portion of the cam portion 14 as shown on the right side of FIG. 3, the disk holding member 8 moves away from the motor shaft 10a. Is allowed to rotate. Therefore, by restricting the position of the disk holding member 8 by the restricting member 9 described later so that the disk holding member 8 does not fall down to the motor shaft side, the claw portion 8a of the disk holding member 8 slightly protrudes toward the disk, and Is its central hole 2
At the edge of a, it is held between the claw 8a of the disk holding member 8 and the slope 7a of the centering member 7.

The restricting member 9 is supported so as to be movable in the direction along the rotation center axis of the turntable 6, and restricts (or prevents) the movement of the disk holding member 8 at the second position when chucking is completed. ). The shape of the regulating member 9 and the configuration for regulating the movement of the disc holding member 8 may be in any form, but the regulating member 9 is inserted into the central cylindrical portion 6a of the turntable 6 as shown. A biasing means 15 (a coil spring is shown in FIG. 3) interposed between the center cap and the turntable 6 applies a biasing force to the center cap in a direction of moving the center cap away from the turntable 6. The use of the configuration provided has an advantage that the number of parts is not significantly increased. In the state shown on the right side of FIG.
Of the disc holding member 8 to the motor shaft 10a side by contacting the protrusion 9a formed on the rear surface of the disc holding member 8 with the protrusion 8c formed on the back surface (the surface opposite to the claw 8a). Has been blocked.

In the above configuration, when the disc is mounted, the center hole 2a of the disc 2 is inserted into the regulating member 9 as shown on the left side of FIG. Contact. At this time, the centering member 7 moves toward the turntable 6 (downs) against the force of the urging means 13 by being pressed by the disk 2, but the centering member 7 does not simply move, The member moves in a direction along the rotation axis while rotating about the rotation axis of the turntable 6. That is, the centering member 7 is
Since the cam portion 14 is provided on the inner peripheral surface of the hole 7b, it is necessary to release the position regulation so that the disk holding member 8 is moved to the second position by rotation.

As a configuration for the helical movement of the centering member 7, a groove or a protrusion may be formed in the member, and a protrusion or a groove to be engaged with them may be formed in the turntable 6. The embodiment shown in FIG.

(A) A form in which a groove or a protrusion is formed on the inner peripheral surface of a hole formed in the center shaft of the centering member. (B) A groove or a protrusion on the (outer) peripheral surface of the outer peripheral edge of the centering member. Form that formed.

The details of these will be described later in the description of the embodiments. However, as a configuration for moving the centering member in the direction along the rotation center axis while rotating the centering member, the engagement between the groove and the projection is described. There is an advantage that the increase in the number of parts can be suppressed by adopting a simple mechanism utilizing the above.

In the left view of FIG. 3, the state in which the regulating member 9 moves toward the turntable 6 against the force of the urging means 15 and is sunk is the disk holding member 8.
Is restricted by the inner peripheral surface of the hole 7b of the centering member 7 and falls down toward the motor shaft 10a, and the slope formed on the projection 8c of the disk holding member 8 comes into contact with the projection 9a of the regulation member 9. This is because this is pushed to the turntable 6 side.

On the other hand, when chucking is completed, as shown on the right side of FIG. 3, the disk holding member 8 is at a position corresponding to the maximum radius of the cam portion 14 of the centering member 7 (that is, the disk holding member 8 At this point, the claw 8a has a degree of freedom in the direction of gripping the inner peripheral edge of the disk center hole 2a.) Since the projection 8c is in contact with the projection 9a of the regulating member 9, And the disk holding member 8 is raised on the disk side.

Then, the disk 2 is placed on the turntable 6 via the rubber sheet 6d, and its center hole 2a
Is clamped between the claw portion 8a of the disk holding member 8 and the inclined surface 7a of the centering member 7. The holding force at this time depends on the force of the urging means 13. In addition, the regulating member 9
Is biased in a direction away from the turntable 6 by the force of the biasing means 15, so that when the disk holding member 8 tilts toward the disk, the position of the projection 9a is not restricted by the slope of the projection 8c. , Lifted up in the figure. At this time, the limit position (upper limit position) of the regulating member 9
The annular projection 9b (the portion having a triangular cross section in FIG. 3) formed on the regulating member 9 is formed on the regulating piece 8d of the disk holding member 8 (formed on the back side of the claw 8a). It is defined by the contact position.

Therefore, in order to take out the disk 2 in this state, the regulating member 9 lifted upward in the figure is pressed against the turntable 6 by a finger or a releasing member (ejection member) to release the regulating member 9. Move. by this,
The movement restriction on the disk holding member 8 is released, and the disk holding member 8 is tilted toward the motor shaft 10a (since the centering member 7 moves while rotating to return to the original state). And the holding of the disk by the disk holding member 8 is released. In other words, when the regulating member 9 is pressed, the regulation of the disc holding member 8 is released, and the disc holding member 8 can be tilted toward the motor shaft 10a, so that the degree of freedom in the direction is obtained. As described above, since the force in the direction away from the turntable 6 is constantly applied to the disk 2 by the centering member 7 and the urging means 13, the disk 2 is pushed back together with the centering member 7 upward in the drawing. At the same time, the centering member 7 is lifted while rotating, so that the disk holding member 8 is regulated by the inner peripheral surface (minimum radius portion) of the hole 7b of the centering member 7 and tilted toward the motor shaft 10a, so that the disk 2 is moved. When the disk is lifted to the position farthest from the turntable 6, the claw 8a of the disk holding member 8 is completely separated from the disk 2.

As described above, since the disc 2 can be easily taken out only by pushing the regulating member 9 toward the turntable 6, there is no fear that an excessive force is applied to the disc. Even if the urging force on the centering member 7 is increased in order to increase the holding force on the disk 2, the chucking of the disk can be easily released only by applying the force (pressing force) required for moving the regulating member 9. Can be. In addition to the turntable 6, the centering member 7, the disk holding member 8, the regulating member 9, the urging means 13,
Since only a few points including 15 are required, it is possible to suppress an increase in cost and to prevent the workability at the time of assembly from deteriorating.

In the chucking mechanism according to the present invention, a mechanism for restricting or canceling the posture of the disk holding member by (rotation) of the cam portion formed on the centering member, a disk holding member and the centering member are provided. A mechanism for clamping the disc at the edge of the center hole and a mechanism for releasing the disc chucking by pressing the regulating member are provided. The details of the structure will be described in the following embodiments.

[0037]

4 to 21 show a chucking mechanism according to a first embodiment of the present invention.

4 to 6 show the structure of the turntable. FIG. 4 is a plan view, FIG. 5 is a sectional view taken along the line V--V in FIG. 4, and FIG. 6 is a side view.

In the turntable 16, a disk portion 17 and a cylindrical portion 18 located at the center thereof are integrally formed using a synthetic resin material. A concave portion 19 is formed in the disk portion 17 from a middle position to the cylindrical portion 18, and this provides a space for receiving a center ring, a chuck claw, and a biasing member (coil spring) described later. In addition, a motor shaft of a spindle motor (not shown) is inserted and fitted into a center hole 18a formed in the cylindrical portion 18, so that the turntable 1 is rotated by the rotational force of the motor.
6 is rotated.

The tip portion of the cylindrical portion 18, that is, the disk portion 17
At the end farther from the outer surface, three engagement grooves 20 are provided.
As shown in FIG. 4, each groove is formed at an angular interval of 120 ° around the rotation center axis of the turntable 16, and a spiral along the outer surface of the cylindrical portion 18 is formed. Groove. That is, as shown in FIG. 6, when one of the grooves is viewed from the side, one end of the groove 20 is located at a position slightly closer to the disk portion 17, and the cylindrical portion 18 is moved from here.
And extends obliquely along the outer surface of the cylindrical member 18 and finally reaches the end of the cylindrical portion 18. Engagement projections formed on a center ring, which will be described later, are respectively engaged with these engagement grooves, and have a role of rotating the center ring as it descends. It will be described in detail.

A rubber sheet 21 is provided on one surface of the disk portion 17 near the outer peripheral edge thereof, and functions as a buffer member when a disk is loaded. This is an annular rubber material having a predetermined thickness adhered to the surface of the turntable. The disc is placed in a state in which the disc is in contact with the rubber sheet 21 without directly touching the turntable. It is necessary to place the rubber sheet 21 as a substitute for the rubber sheet 21 as long as it is a means for alleviating the impact on the disk during disk chucking or preventing damage. I do not care.

A shallow pedestal portion 22 is formed in the concave portion 19 of the turntable 16 and is continuous with the bottom of the cylindrical portion 18. Three mounting parts 2 for mounting
3, 23, 23 are provided. As shown in FIG. 4, these mounting portions are arranged at an angular interval of 120 ° around the rotation center axis of the turntable 16.

The structure of each mounting portion 23 is the same, so one of them will be described.
Reference numeral 3 denotes a pair of bosses 24, 24 arranged opposite to each other at a predetermined distance, and one end (rotation fulcrum) of the chuck pawl positioned between these bosses. The contact portion 25 is provided.

As shown in FIG. 5, the boss portions 24 are slightly higher than the pedestal portion 22,
Engagement holes 24a, 24a for supporting rotatable chuck claws to be described later are formed in these, respectively. In addition, these engaging holes are formed in the cylindrical portion 1.
8 is formed as an elongated hole extending in a direction parallel to the central axis, and extends to the lower end of the disk portion 17 (a flat portion on the opposite side to the concave portion 19).

The abutted portion 25 is formed as a cylindrical curved concave between the pair of bosses 24, 24, and has a shape corresponding to the shape of an end of a chuck claw described later. Is what you do. In addition, as shown in FIG. 4, from the direction along the rotation center axis of the turntable 16,
When the two abutted portions 25, 25, 25 are viewed, they are arranged at an angular interval of 120 ° around the rotation center axis, and a pair of bosses are sandwiched on both sides of each abutted portion 25. The parts 24, 24 are arranged.

A step 26a is formed on the inner wall surface 26 of the recess 19 over the entire circumference. This step is performed when the center ring described later is received in the recess 19 and the center ring contacts the step 26a. It has the role of restricting further movement to the turntable side by being touched.

7 and 8 show the shape of a center ring (corresponding to the above-mentioned centering member). FIG. 7 is a plan view, and FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. is there.

The center ring 27 has a cylindrical portion 28 (corresponding to the above-mentioned central shaft portion) forming a central portion thereof,
An outer peripheral portion 29 formed so as to project outward from the periphery is integrally formed of a synthetic resin material. A central hole 28a is formed in the cylindrical portion 28, and its inner peripheral surface is provided around the central axis of the central hole 28a as shown in FIGS. 7 and 8 (enlarged in a large circle). And 3
The two projections 30, 30, 30 are formed at an angular interval of 120 °. Note that these projections 30 are used when the cylindrical portion 28 of the center ring 27 is externally attached to the cylindrical portion 18 of the turntable 16 and attached.
6, engaging grooves 20, 20, 20 formed on the outer surface of the cylindrical portion
, Respectively. Each projection has a shape as if a part of a hemisphere was cut by a plane parallel to a great circle.

Further, three holes 31, 31, 31 of the same shape are formed in the outer peripheral portion 29, and the shape of these holes viewed from the direction along the rotation center axis of the center ring 27 is shown in FIG. As shown in FIG.
It extends to the base of eight. Of the inner surface of each hole 31,
A cam surface 32 is formed on the surface facing the cylindrical portion 28, and serves to regulate the tilting posture of the chuck pawl as described later. That is, the cam surface 32 is
An arc surface 32a having the smallest radius from the rotation center axis of
It is formed by an arc surface 32c having a larger radius than this and a tapered surface 32b located between the two arc surfaces and connecting them. In addition, regarding the positional relationship between these holes 31, 31, 31 and the above-mentioned protrusions 30, 30, 30, the boundary position between the arc surface 32 a and the tapered surface 32 b and the cylindrical portion 2
8 is formed with the center ring 27.
The rotation angle is based on the center axis of rotation, and the arc surface 32 extends in the counterclockwise direction in FIG.
a, the tapered surface 32b, and the arc surface 32c are located in this order, and the three members are continuous.

As shown in FIG. 8, the outer peripheral portion 29 is formed into a substantially L-shaped bent portion from a flat portion continuous from one end of the cylindrical portion 28 and then connected to the peripheral portion 33. A slant surface 33a is formed on the peripheral edge portion 33, and the edge of the center hole 2a of the disk 2 comes into contact with the slope surface. Further, a concave portion 33b is formed in an inner portion of the inclined surface 33a so that a coil spring described later comes into contact with the concave portion 33b.

FIGS. 9 to 12 show the shape of the center cap (corresponding to the above-mentioned regulating member).
9 is a plan view, FIG. 10 is a bottom view, FIG. 11 is a side view, FIG.
2 is a cross-sectional view along the line XII-XII in FIG.

The center cap 34 has a substantially disk-shaped disk portion 35 and three projecting portions 36 projecting therefrom.
36 and 36 are integrally formed using a synthetic resin material. As shown in FIG. 9, a circular hole 37 is formed in the center of the disk portion 35, and one hole 37 is formed around the center of the hole.
The three notches 38, 38, 3 with an angular interval of 20 °
8 are formed. In addition, these notches 38 having a substantially rectangular shape are attached to the mounting portions 23 of the turntable 16 described above.
And contributes to formation of a space for arranging chuck claws, which will be described later.

The three protrusions 36, 36, 36
As shown in the figure, it is formed immediately around the circular hole 37,
Positionally, it is provided between the circular hole 37 and the notch 38. That is, these projections 36 are formed at an angular interval of 120 ° with respect to the center of the circular hole 37. As shown in FIG. 12, a protrusion 39 is formed in the middle of the protrusion 36 so as to protrude outward (in a direction away from the center of the circular hole 37), and this will be described later. The coil spring comes into contact with the coil spring.

FIG. 13 shows the shape of a chuck claw (corresponding to the above-mentioned disk holding member), and also shows a plan view, a side view, a bottom view and a front view thereof.
Since all three chuck claws have the same shape, only one of them will be described below.

The chuck pawl 40 is formed of a synthetic resin, and has a pawl 41 and a pair of legs 42,42.

A projection 43 is provided at the tip of the claw 41 for abutting on and holding the disk, and a projection 44 is formed at a position opposite to the projection 43.

The slope 45 extends from the position where the protrusion 44 is formed to a position closer to the leg 42 in the claw portion 41.
Is formed to be continuous from the inclined surface 45 to the back surface of the leg portion 42 via the flat surface 46. As will be described later, the ridges 39 of the center cap 34 are brought into contact with the slope 45.

A semi-cylindrical ridge 47 is formed at a position of the claw 41 opposite to the flat surface 46, and the ridge 47 is formed by the cam of the center ring 27. It is in sliding contact with the surface 32.

As for the pair of legs 42, 42, the ends 48, 48 are formed in a circular shape when viewed from the side.
This portion is adapted to be attached to (the attaching portion 23 of) the turntable 16. To this end 4
Engagement projections 49, 49 are formed on the outer surfaces of 8, 8, respectively, and they face in opposite directions to engage with the engagement holes 24a of the boss portion 24 described above. Each engaging projection 49 has a shape obtained by cutting a part of a cylinder obliquely.

FIG. 14 shows metal coil springs 50 and 51 in addition to the components described above, and shows a state before the chucking mechanism 52 is assembled. As shown, the coil springs 50, 5
1 and the chuck pawl 40 are arranged in the concave portion 19 of the turntable 16, and the cylindrical portion 1 of the turntable 16 is
The center cap 34 is attached from above with the cylindrical portion 28 of the center ring 27 being extrapolated to 8. That is, when attaching the chuck claw 40 to the attachment portion 23 of the turntable 16, the engagement protrusions 49, 49 formed on the end 48 of the chuck claw 40 are attached to the attachment portion 23.
The chuck claw 40 is rotatably supported by the boss portion 24 by engaging with the engagement holes 24a, 24a. The center ring 27 has a cylindrical portion 2.
8 are formed on the inner peripheral surface of the turntable 1
The cylindrical portion 28 of the center ring 27 is externally inserted into the cylindrical portion 18 of the turntable 16 by engaging with the respective grooves 20 on the outer periphery of the cylindrical portion 6. Further, the circular hole 37 of the center cap 34 is inserted from the outside thereof.
Each projecting portion 36 of the center cap 34 passes through each hole 31 of the center ring 27 and
9 (between the center ring 27 and the turntable 16). The coil springs 50, 5
1 has a cylindrical outer shape, the coil spring 50 is disposed between the recess 33 b of the center ring 27 and the turntable 16, and the coil spring 51 is provided with a ridge 39 of the center cap 34. And the turntable 16.

FIG. 15 shows a state in which the chucking mechanism 52 is assembled, a state in which the disc 2 is mounted on the left half surface with reference to the center line CL, and a right half surface in which the disk 2 is chucked. Are illustrated in such a manner that the state of completion is compared with each other so that the positional relationship between the members can be easily understood. The hatching lines for each member are omitted intentionally.

The center cap 34 has its circular hole 37 inserted into the cylindrical portion 28 of the center ring 27 from the outside, and can move in the direction of the center axis of the cylindrical portion 28. Each of the ridges 39 of the center cap 34 is connected to the center ring 27 and the turntable 16.
, And are biased by a coil spring 51. That is, the coil spring 51
Has one end in contact with the protruding ridge 39 and the other end in contact with the bottom of the concave portion 19 of the turntable 16, whereby an urging force is applied to the center cap 34 in a direction away from the turntable 16. Working.

The biasing force of the coil spring 50 is applied to the center ring 27 received in the recess 19 of the turntable 16. That is, one end of the coil spring 50 has the concave portion 33 of the center ring 27.
b and the other end of the chuck abuts on the vicinity of the mounting portion 23 of the chuck pawl 40 (near the leg 42), so that the biasing force in the direction away from the turntable 16 against the center ring 27 is always exerted. Working.

The center ring 27 is attached to the turntable 16
Of the center ring 2 against the force of the coil spring 50, the protrusions 30 are individually engaged with the respective engagement grooves 20 of the turntable 16.
7 is moved downward in the figure (in a direction approaching the turntable 16), it is spirally guided by the engagement between the projection 30 and the engagement groove 20 (that is, the center ring 27).
Descends while rotating. ). As described above, the embodiment (A) is employed in this embodiment.

The chuck pawl 40 is connected to the end 4 of the leg 42.
8 is engaged with the engaging hole 24 a of the boss 24 of the turntable 16, so that the mounting portion 23 is formed.
In the state shown in the left half of FIG. 15, the protrusion 47 of the chuck pawl 40 comes into contact with the arcuate surface 32 a formed in the hole of the center ring 27. The claw 40 is regulated so as to be tilted toward the center cap 34 side. On the other hand, in the chucking state shown in the right half of FIG.
7 rotates to project the ridge 4 of the chuck pawl 40 on the arc surface 32c.
7 are in contact with each other, the above restriction is released, and the chuck pawl 40 is
The disc 2 is held between the tip of the claw portion 41 and the inclined surface 33a of the center ring 27 in a state where the disc 2 is tilted away from the disc. In this state, the slope 45 of the chuck pawl 40 is pressed from behind by the ridge 39 of the center cap 34 so that the chuck pawl 40 is regulated so as not to fall.

FIGS. 16 to 21 are diagrams for explaining the operation, and FIGS. 16 to 18 are diagrams for explaining the rotation of the center ring with respect to the turntable and the phase relationship between the cam surface of the center ring and the chuck pawl. 19 to 21 are diagrams schematically showing a positional relationship of each member in a cross section. In FIGS. 16 to 18, the center ring 27 is indicated by a solid line for easy understanding.
Center cap 34 is a two-dot chain line, and chuck jaws 40 are 1
Each member is distinguished by being indicated by a dashed-dotted line, and a main part is shown enlarged in a great circle. 19 to 21, all hatching lines indicating cross sections are omitted.

First, FIG. 16 shows a state before the disc is mounted. The arc surface 32a having the smallest radius in the hole 31 of the center ring 27 is located outside the chuck pawl 40 (in the radial direction from the rotation center of the center ring 27). (In the direction away). That is, as shown in FIG. 19, the ridge 47 of the chuck pawl 40 is
Since the chuck claw 40 is in the state of being most inclined to the rotation center axis side of the turntable 16 by contacting the chuck claw 2 a, the tip of the claw portion 41 of the chuck claw 40 is The position is regulated so as not to protrude outward beyond the outer peripheral edge of the disk portion. This is to prevent the center hole 2a from being caught by the claw portion 41 when the disc 2 is mounted. In this state, the center ring 27 is at the uppermost position (in a direction away from the turntable 16), and the center cap 34 is lowered most when the tip of each protrusion 36 abuts on the pedestal portion 22 of the turntable 16. It is in a state where it has been done. The center cap 34
Is sinking against the force of the coil spring 51 because the ridge 39 of the center cap 34 is
This is because the position is regulated by contact with the position.

FIG. 17 shows a state in the middle of chucking after the disk 2 (not shown) is mounted. The center ring 27 is rotated clockwise in FIG. Has become. In the figure, the chuck pawl 40 is located near the tapered surface 32b of the hole 31 in the relative positional relationship between the cam surface 32 of the center ring 27 and the chuck pawl 40. The position regulation on the claw 40 is slightly relaxed. That is, as shown in FIG. 20, when the disc is mounted, the center hole 2a of the disc 2 is formed on the slope 33a of the center ring 27.
19 is pushed toward the turntable 16 in a state where the edge of the chuck abuts on the turntable 16 and the center ring 27 sinks slightly into the turntable 16 side.
Is slightly tilted outward (in a direction away from the center of the center cap 34). Note that the coil spring 50 is slightly contracted as the center ring 27 is lowered as compared with the state shown in FIG.

When the disk 2 is further lowered toward the turntable 16, the center ring 27
Descends while rotating clockwise in FIG. 17,
Eventually, the state shown in FIGS. 18 and 21 is reached.

FIG. 18 shows a state in which the chucking of the disk has been completed, in which the center ring 27 has descended most and its rotation has stopped. In the figure, in the relative positional relationship between the cam surface 32 of the center ring 27 and the chuck pawl 40, the arcuate surface 32c of the hole 31 and the protrusion 47 of the chuck pawl 40 are located at positions facing each other. The tilting restriction on the claw 40 has been released, and the claw portion 41 of the chuck claw 40 is in a state of protruding most outward. That is, as shown in FIG. 21, the center ring 27 is at the lowest position in the concave portion 19 of the turntable 16, and the chuck pawls 40 are raised to the outermost positions. Then, the edge portion of the center hole 2a of the disk 2 is sandwiched between the claw portion 41 of the chuck claw 40 and the inclined surface 33a of the center ring 27, and a part of the disk 2 is interposed via the rubber sheet 21. On the turntable 16. The center cap 34 is in a state of being most lifted by the urging force of the coil spring 51, and its ridge 39 is
Is pressed outward by abutting against the inclined surface 45, thereby preventing the chuck claw 40 from falling inward and further suppressing its own further rise (chuck claw). The protrusions 44 at 40 are stoppers for the protrusions 39 of the center cap 34.)
Also, the coil spring 50 is in the most contracted state,
Stores energy when removing discs.

The chucking operation of the disk 2 is performed as described above. When the disk 2 is taken out, the following operation is performed.

That is, in FIG.
When the floating center cap 34 is pressed downward by the force of the above, the contact between the projection 39 of the center cap 34 and the inclined surface 45 of the chuck pawl 40 is released, and the chuck pawl 40 tilts inward. Get the freedom you can.
As described above, since the biasing force acting on the center ring 27 in the direction away from the turntable 16 by the coil spring 50 acts, the center ring 27 rises while rotating in the direction to return to the original state by releasing the contact relationship (FIG. 18
Helically rotates in the counterclockwise direction of. ).
As is clear from the relationship between the point of force and the rotation fulcrum, the chuck pawl 40 falls inward, and the center ring 27 rises while rotating, so that the disk 2 is lifted by the center ring 27. The chuck jaws 40 are finally retracted most inward as shown in FIGS.
Is completely separated from the center hole 2a of the disk 2 so that the claw portion 41 does not get caught in the center hole 2a of the disk 2, so that there is no problem in taking out (ejecting) the disk 2.

As described above, in the chucking mechanism 52 according to the first embodiment, the engagement mechanism for spirally moving the center ring 27 with respect to the turntable 16 is provided on the outer periphery of the cylindrical portion 18 of the turntable 16. And the protrusion 30 formed on the inner peripheral surface of the cylindrical portion 28 of the center ring 27, so that the engagement groove 20 There is an advantage that the length of the file can be reduced.

FIGS. 22 to 36 show a second embodiment according to the present invention.

FIGS. 22 and 23 show the structure of the turntable. FIG. 22 is a plan view, and FIG.
It is sectional drawing which follows the III-XXIII line.

In the turntable 53, a disc-shaped mounting portion 54 and a cylindrical portion 55 located at the center thereof are integrally formed using a synthetic resin material. And the mounting part 5
4 has a concave portion 56 extending from the middle position to the cylindrical portion 55.
Is formed, which provides a space for receiving a center ring, a chuck claw, and a biasing member (coil spring) described later. Although not shown, a motor shaft of a spindle motor is inserted into and fitted into a center hole 55a formed in the cylindrical portion 55 so that the turntable 53 is rotated by the rotational force of the motor. It has become.

A rubber sheet 57 as a cushioning member is provided on one surface of the mounting portion 54 near the outer peripheral edge thereof.
Is provided. This is such that an annular rubber material having a predetermined thickness is adhered to the surface of the turntable 53, and the disc is brought into contact with the rubber sheet 57 without directly touching the turntable 53. Is needed to place the

As shown in FIG. 22, three engaging projections 58, 58, 58 are formed on the inner wall surface of the concave portion 56 of the turntable 53 at an angle of 120 ° around the rotation center axis of the turntable 53. With an interval inside (cylindrical part 55
(In the direction of approaching). These engaging projections are engaged with grooves formed on the side surface of the center ring, which will be described later, and have a role of rotating the center ring as it descends. The operation will be described later in detail.

In the recess 56, a shallow pedestal portion 59 is formed continuously from the bottom of the cylindrical portion 55.
See 3. ), Between the portion and the inner wall surface, three mounting portions 60, 60 for mounting chuck claws described later,
60 are provided, as shown in FIG.
The turntable 53 is arranged around the rotation center axis at an angular interval of 120 °. As shown in FIG. 22, the positional relationship between the mounting portion 60 and the engaging protrusion 58 is such that the mounting portion 60 is located between the adjacent engaging protrusions 58 and closer to the inside. Are located respectively.

Since the configuration of each mounting portion 60 is the same, one of them will be described.
0 has a hole 60a for arranging the chuck claws and a pair of engagement holes 60b, 60b formed on both sides thereof.
That is, the arrangement hole 60a has a shape (actually depends on molding) formed by cutting out a part of the bottom surface of the concave portion 56, and is continuous with the pedestal portion 59 as shown in FIG. It is formed between the end of the inclined surface 60 c extending in the radial direction of the mounting portion 54 (in the direction away from the cylindrical portion 55) and the wall surface of the concave portion 56 opposed thereto. And the arrangement hole 60a
The left and right side walls 60d, 60d forming the
b and 60b are formed respectively, and these engagement holes are provided for rotatably supporting a chuck claw described later.

24 to 26 show the shape of a center ring (corresponding to the above-mentioned centering member). FIG. 24 is a plan view, FIG. 25 is a side view, and FIG. 26 is XXVI-XXVI of FIG. It is sectional drawing which follows a line.

The center ring 61 is formed in a substantially annular shape by a synthetic resin material. As shown in FIG. 24, a hole 62 formed around the center of rotation is
Three notches 62c, 62c, 62c are formed at an angular interval of 120 °. A cam surface is formed on the inner surface of the hole 62, and serves to regulate the tilting posture of the chuck pawl as described later. That is, most of the cam surface of the hole 62 is formed by three arc surfaces 6 forming a circular hole.
2a, 62a, and 62a, which are the portions having the smallest (inner) radius, but the portion connecting the arc portion 62a to the notch 62c has a tapered surface 6a.
The radius is gradually increased by the formation of each of 2b, and is continued to a portion (arc-shaped portion) having a maximum (inner) radius in notch 62c.

As shown, the center ring 61 is
A substantially ring-shaped ring portion 63 forming the outer peripheral edge
And a plate-like portion 64 (portion where the hole 62 is formed) connected to the end thereof, and a slope 65 is formed in a portion near the outer peripheral edge thereof. Further, three grooves 66, 66, 66 are formed on the outer surface of the ring portion 63, and these are spiral grooves. That is, as shown in FIG. 25, one end of the groove 66 is
4 has reached a continuous boundary portion on the outer surface,
When viewed from the side, the other end of the groove 66 extends to the end face of the ring portion 63 (the lower end face farther from the plate-shaped portion 64) after extending in an oblique direction from this. The end of each groove 66 when the center ring 61 is viewed from a plane and the above notch 6
Regarding the positional relationship with 2c, as shown in FIG. 24, each notch 62c is arranged at a position between the groove ends of adjacent grooves and closer to the inside.

As for the cross-sectional shapes of the ring portion 63 and the plate-shaped portion 64, as shown in FIG. 26, an annular concave portion 67 is formed inside the vicinity of the boundary between the two portions. Is brought into contact with the center ring 6
1 is provided with a biasing force in a predetermined direction.

The portion of the ring portion 63 near the end surface distant from the plate-shaped portion 64 is gradually reduced in thickness toward the end, so that a slightly inclined portion 68 is formed inside (see FIG. 26). ) Is formed, which is required as an escape for a coil spring described later.

FIGS. 27 and 28 show the shape of the center cap (corresponding to the above-described regulating member). FIG. 27 is a plan view, and FIG.
It is sectional drawing which follows the XXVIII line.

The center cap 69 has a substantially cylindrical main part 70 and a disk-shaped flange 71 integrally formed of a synthetic resin material. As shown in FIG. 27, a circular hole 70a is formed in the center of the main part 70, and three notches 72, 72, 72 are formed around the center of the hole at an angular interval of 120 °. Is formed.
These cutouts 72 are portions formed by cutting out a part of the flange 71 in the radial direction in a rectangular shape, and correspond to the mounting portions 60 provided on the turntable 53, respectively. This contributes to formation of a space for arranging chuck claws, which will be described later.

As shown in FIG. 28, an annular recess 70b is formed inside the main portion 70.
For this, a coil spring described later is received. An annular ridge 70c facing outward (in a direction away from the center axis of the main portion 70 in the radial direction) is formed at a position near the end of the main portion 70 opposite to the flange portion 71. I have.

FIG. 29 shows the shape of a chuck claw (corresponding to the above-mentioned disc holding member), and also shows a plan view, a side view, a bottom view and a front view thereof.
Since all three chuck claws have the same shape, only one of them will be described below.

The chuck pawl 73 is formed of a synthetic resin and has a pawl 74 and a pair of legs 75.

A projection 76 is provided at the tip of the claw 74 for contacting and holding the disk, and an elastic piece 77 is integrally formed at a position opposite to the projection 76. . The projection 78 is located on the same surface as the surface on which the elastic piece 77 is formed at a position near the leg 75 of the claw 74.
Are formed and project in the direction opposite to the projection 76. An inclined surface 79 is formed on the surface of the protrusion 78 farther from the elastic piece 77.

Each of the pair of legs 75, 75 is formed in a U-shape when viewed from the side.
The end portions 80, 80 are formed in a circular shape, and this portion is attached to (the attachment portion 60 of) the turntable 53. For this purpose, engaging projections 81, 81 are formed on the outer surfaces of the end portions 80, 80, respectively, and they face in opposite directions to engage with the engaging holes 60b, 60b of the mounting portion 60 described above. Are combined.

FIG. 30 shows a state where the chucking mechanism 84 is assembled by incorporating metal coil springs 82 and 83 in addition to the above-described parts.
The left half of the figure is compared with the state before loading the disc, and the right half of the figure is compared with the state where chucking of the disc 2 is completed, so that the positional relationship of each member can be easily understood. Is illustrated in FIG. The hatching lines for the chuck claws 73 are intentionally omitted.

The center cap 69 is attached with the cylindrical portion 55 of the turntable 53 inserted in a circular hole 70a formed therein, and a coil spring 82 is disposed in the concave portion 70b. That is, one end of the coil spring 82 having a cylindrical outer shape is formed in the concave portion 70b.
And the other end thereof is in contact with the pedestal portion 59 of the turntable 53, and a biasing force is applied to the center cap 69 in a direction away from the turntable 53.

A coil spring 83 is disposed between the center ring 61 received in the concave portion 56 of the turntable 53 and the bottom surface of the concave portion 56, and one end of the coil spring is inserted into the concave portion 67 of the center ring 61. The urging force to the center ring 61 is always applied because the other end is brought into contact with the vicinity of the attachment part 60 of the chuck pawl 73 (near the leg part 75). In addition, the coil spring 8
The outer shape of the center ring 3 is frusto-conical, and the end of the center ring 61 that is in contact with the recess 67 has the smallest diameter, and the radius becomes smaller toward the lower side (the bottom surface of the recess of the turntable 53). Is getting bigger and bigger.

The center ring 61 is attached to the turntable 53
When inserted into the concave portion 56, the engaging projections 58, 58, 58 formed on the inner wall surface of the concave portion 56 are respectively engaged with the grooves 66, 66, 66 of the center ring 61, respectively. However, when the center ring 61 is moved downward in the figure (in a direction approaching the turntable 53) against the force of the coil spring 83, the center ring 61 is spirally guided by the engagement between the engagement protrusion 58 and the groove 66. (That is, centering 6
1 descends while rotating. ). As described above, the embodiment (B) is employed in this embodiment.

The chuck pawl 73 is connected to the end 8 of the leg 75.
0 to the engaging hole 60 of the mounting portion 60.
30B, the chuck pawls 73 are supported by the holes 62 of the center ring 61 (the cam surfaces thereof) so that the chuck pawls 73 are centered in the state shown in the left half of FIG. It is regulated so as to be tilted toward the line CL. On the other hand, in the chucking state shown in the right half of FIG. 30, the center ring 61 is rotated and the chuck pawl 73 is in a positional relationship corresponding to the notch 62c. The chuck pawl 73 is tilted in a direction away from the center line CL to be in a raised state.
The disk 2 is sandwiched between the two. In this state, the projection 78 of the chuck pawl 73 is
The contact with the ridge 70c of the ninth restricts the chuck pawl 73 from falling down.

FIGS. 31 to 36 are views for explaining the operation. FIGS. 31 to 33 are views for explaining the rotation of the center ring with respect to the turntable and the phase relationship between the holes and notches of the center ring and the chuck claws. FIGS. 34 to 36 are views for schematically showing a positional relationship of each member in a cross section. 31 to 33.
In consideration of easy understanding, the center ring 6
1 is indicated by a solid line, the center cap 69 is indicated by a two-dot chain line, and the chuck claws are indicated by a one-dot chain line, so that the members are distinguished from each other. FIG.
In FIG. 36 to FIG. 36, all hatching lines showing the cross sections are omitted.

First, FIG. 31 shows a state before the disc is mounted. The arc surface 62a having the minimum radius of the hole 62 of the center ring 61 is located outside the chuck pawl 73 (radius from the center of rotation of the center ring 61). In the direction away from each other). That is, as shown in FIG.
The lower portion of the claw portion 74 of the chuck claw 73 contacts the arc surface 62 a of the hole 62 of the center ring 61 so that the chuck claw 73 is tilted most inward (toward the rotation center axis). Therefore, the position of the chuck claw 73 is regulated so that the tip of the claw portion 74 does not protrude outward beyond the flange portion 71 of the center cap 69 (otherwise, the disc 2 is not moved). This is because the center hole 2a is hooked on the claw portion 74 when it is mounted.) In this state, the center ring 61 comes to the uppermost position (in the direction away from the turntable 53), and the surface of the plate-like portion 64 is claw portion 74 of the chuck claw 73.
Abut from the bottom of the figure. In addition, the center cap 69 has a main part 70 that is the base 5 of the turntable 53.
9 is in the most lowered state,
The elastic piece 77 of the chuck pawl 73 is in elastic contact with the side surface of the zero. The center cap 69 sinks against the force of the coil spring 82 because of the ridges 7 of the center cap 69.
This is because the position 0c is in contact with the inclined surface 79 of the projection 78 of the chuck pawl 73 and its position is regulated.

FIG. 32 shows a state in the middle of chucking after a disk (not shown) is mounted. The center ring 61 is rotated slightly counterclockwise in FIG. Has become. In the figure, the chuck pawl 73 is located near the tapered surface 62b of the hole 62 in the relative positional relationship between the hole 62 of the center ring 61 and the chuck pawl 73. The position regulation for the claw 73 is slightly relaxed. That is, as shown in FIG. 35, the center ring 61 is pressed by the disk 2 and slightly sinks toward the turntable 53 (the edge of the center hole 2a of the disk 2 is in contact with the slope 65 of the center ring 61). 34), the chuck claws 73 are slightly inclined outward (in a direction away from the main portion 70 of the center cap 69) as compared with the state of FIG. The restoring force gives a force to push the chuck pawl 73 outward.)
The coil spring 83 is moved with the lowering of the center ring 61.
Are slightly shrunk compared to the state of FIG.

When the disk 2 is further lowered toward the turntable 53, the centering 61
Descend while rotating, and finally reach the state shown in FIGS. 33 and 36.

FIG. 33 shows a state in which the chucking of the disk has been completed, in which the center ring 61 is rotated down most. In the figure, in the relative positional relationship between the hole 62 of the center ring 61 and the chuck pawl 73, the notch 62c (the arc surface) of the hole 62 and the chuck pawl 73 come to correspond to each other.
3 has been released, and the chuck pawl 73 has been released.
Is in a state in which the claw portion 74 projects outward. That is, as shown in FIG. 36, the center ring 61 is most lowered in the concave portion 56 of the turntable 53, and the chuck pawl 73 is raised up to the outermost. The edge of the center hole 2 a of the disk 2 is in contact with the claw portion 74 of the chuck claw 73 and the center ring 61.
Of the disk 2
Is supported on the turntable 53 by abutting the rubber sheet 57. The center cap 69
Is in a state of being most lifted by the urging force of the coil spring 82, and the ridge 70 c is
Is pressed outward by contact with the inclined surface 79, thereby preventing the chuck claw 73 from falling inward and further suppressing its own rise. Further, the coil spring 83 is in the most contracted state, and stores the energy when the disk is taken out.

The chucking operation of the disk 2 is performed in the course of the above. When the disk 2 is taken out, the following operation is performed.

That is, in FIG. 36, when the floating center cap 69 is pressed downward, the ridge 70 c of the center cap 69 and the inclined surface 79 of the chuck pawl 73 are pressed.
Is released, so that the chuck pawl 73 can be tilted inward. As described above, since the biasing force acting on the center ring 61 in the direction away from the turntable 53 by the coil spring 83 acts on the center ring 61, the center ring 61 rotates in the direction to return to its original position by this release. The disc 2 is lifted by the chuck pawl 73 falling inward and the center ring 61 rising while rotating due to the relationship between the power point of the chuck pawl 73 and the pivot point. Note that the chuck pawl 73 is
As shown in FIG. 34, the disk 2 is completely retracted inward and is completely separated from the disk 2, so that the claw portion 74 does not catch on the center hole 2 a of the disk 2 and hinders the removal of the disk 2. .

As described above, in the chucking mechanism 84 according to the second embodiment, the engaging mechanism for spirally moving the center ring 61 with respect to the turntable 53 is formed in the concave portion 56 of the turntable 53. Since each of the engaging projections 58 and each of the grooves 66 formed on the outer peripheral surface of the center ring 61 are formed, it is advantageous in that the center ring 61 can be moved stably and smoothly. . In this embodiment, the chuck pawl 73 is used.
Of course, appropriate measures may be taken in designing, such as reducing the frictional resistance by forming a protrusion or a ridge on a portion of the center ring 61 that contacts the cam surface.

According to each of the embodiments described above, the following advantages can be obtained.

The chucking of the disc can be performed without applying an excessive force when the disc is mounted.

Since the projection of the chuck pawl does not slide with respect to the inner peripheral surface of the disk center hole when the disk is mounted, for example, a disk of a type made by bonding two disk substrates together ( When a digital video disc is used, the protrusion of the chuck claw does not catch on the boundary portion of the bonding, and the disc and the chuck claw are not damaged.

When the disk is mounted, the edge of the disk center hole is brought into contact with the slope of the center ring to perform centering of the disk. Therefore, the information is stored in a state where the disk is largely eccentric with respect to the rotation axis of the turntable. Inconvenience such as recording / reproducing is eliminated, and accurate disk centering also reduces the applied voltage required for tracking control, which is suitable for power saving.

After the disk chucking is completed, the center cap is lifted, so that when the disk is manually taken out, the user can easily recognize the position to be pressed.

Since the number of parts is the same as the conventional one, there is no significant cost increase, and the workability at the time of assembling can be achieved by assembling the parts on the turntable in order. Easy.

[0112]

As is apparent from the above description, according to the first and seventh aspects of the present invention, the restriction member is moved to release the restriction on the movement of the disk holding member to thereby hold the disk. Since the holding of the disk by the member and the centering member is released, the disk can be removed without difficulty, and when the disk is mounted, the centering member is pressed by the disk and moved in the direction along the rotation axis of the turntable. Therefore, damage and the like can be prevented by preventing an excessive force from being applied at the time of mounting. The provision of the centering member, the disk holding member, and the regulating member does not cause a significant increase in the number of components or the number of assembling operations, which is advantageous in terms of cost.

According to the second aspect of the invention, the mechanism for moving the centering member in the direction along the rotation axis while rotating the centering member around the rotation axis of the turntable can be simplified.

According to the third aspect of the present invention, by forming the groove or the projection of the centering member on the outer peripheral surface of the centering member or the inner peripheral surface of the center shaft portion, the rotation of the centering member with respect to the turntable and the rotation of the centering member can be improved. There is no need to secure a large space for the moving mechanism, and the mechanism does not hinder the movement of the disk holding member.

According to the fourth and sixth aspects of the present invention, the restriction on the movement of the disk holding member is released by moving the restriction member, thereby releasing the disk holding and easily removing the disk from the chucking mechanism. Therefore, the disk is not damaged.

[Brief description of the drawings]

FIG. 1 is a diagram conceptually showing a configuration of a main part of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram for explaining a basic configuration of a disk chucking mechanism according to the present invention together with FIG. 3;
This figure is a plan view.

FIG. 3 is a cross-sectional view showing a state in which a disc is being mounted on the left half surface, and a cross-sectional view showing a state when chucking is completed, on the right half surface for explaining the chucking operation.

FIG. 4 shows a first embodiment according to the present invention, together with FIGS. 5 to 21, and FIGS. 4 to 6 are views showing the shape of a turntable, and FIG. 4 is a plan view. .

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a side view.

FIG. 7 shows a center ring together with FIG. 8, and FIG. 7 is a plan view.

8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 shows the shape of the center cap together with FIGS. 10 to 12, and FIG. 9 is a plan view.

FIG. 10 is a bottom view.

FIG. 11 is a side view.

FIG. 12 is a sectional view taken along the line XII-XII in FIG. 10;

FIG. 13 is a view showing a shape of a chuck claw.

FIG. 14 is a view showing a chucking mechanism before assembly.

FIG. 15 is a diagram illustrating a state in which a disk is mounted on the left half surface and a state in which disk chucking is completed in the right half surface.

FIG. 16 is a diagram for explaining the rotation of the center ring with respect to the turntable and the phase relationship between the cam surface of the center ring and the chuck pawl together with FIGS. 17 and 18; FIG.

FIG. 17 is a diagram showing a state in which a disk is being mounted.

FIG. 18 is a diagram showing a state in which disk chucking is completed.

FIG. 19 is a sectional view showing the positional relationship of each member together with FIGS. 20 and 21. FIG. 19 is a view showing a state before the disk is mounted.

FIG. 20 is a diagram showing a state in which a disk is being mounted.

FIG. 21 is a diagram showing a state where disk chucking is completed.

22 shows a second embodiment according to the present invention, together with FIGS. 23 to 36. FIGS. 22 and 23 are views showing the shape of a turntable, and FIG. 22 is a plan view. .

FIG. 23 is a sectional view taken along the line XXIII-XXIII in FIG. 22;

FIG. 24 shows a center ring together with FIGS. 25 and 26, and FIG. 24 is a plan view.

FIG. 25 is a side view.

FIG. 26 is a sectional view taken along the line XXVI-XXVI in FIG. 24;

27 shows the shape of the center cap together with FIG. 28, and FIG. 27 is a plan view.

28 is a sectional view taken along the line XXVIII-XXVIII in FIG.

FIG. 29 is a view showing the shape of a chuck claw.

FIG. 30 is a diagram illustrating a state in which a disk is mounted on the left half surface, and a state in which disk chucking is completed in the right half surface.

FIG. 31 is a diagram for explaining the rotation of the center ring with respect to the turntable and the phase relationship between the cam surface of the center ring and the chuck claws together with FIG. 32 and FIG. 33. FIG.

FIG. 32 is a diagram showing a state in which a disk is being mounted.

FIG. 33 is a diagram showing a state where disk chucking is completed.

FIG. 34 is a sectional view showing the positional relationship of each member together with FIGS. 35 and 36, and is a view showing a state before the disk is mounted.

FIG. 35 is a diagram showing a state in which a disk is being mounted.

FIG. 36 is a diagram showing a state in which disk chucking is completed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Recording / reproducing apparatus, 2 ... Disk, 2a ... Center hole, 3 ...
Disc chucking mechanism, 6 ... turntable, 7 ...
Centering member, 8: disk holding member, 9: regulating member, 20, 66: groove, 30, 58: protrusion

Claims (7)

[Claims] 1. A disk chucking mechanism having a turntable on which a disk is mounted, the disk chucking mechanism being provided for centering the disk, being pressed by the disk when the disk is mounted, in a direction along the rotation axis of the turntable. A centering member supported by the turntable in a movable state and urged away from the turntable; a first position not in contact with the periphery of the center hole of the disc; By being supported by the turntable so as to be movable over a second position in contact with and holding the same, the position regulation is released with the movement of the centering member, and the centering member is moved to the second position. A disc holding member for holding a disc between the centering member, and a direction along a rotation axis of the turntable And a regulating member that regulates movement of the disc holding member when chucking is completed. 2. The disk mounting mechanism according to claim 1, wherein a groove or a protrusion is formed on the centering member, and a protrusion or a groove is formed on the turntable to engage with the groove. A disc chucking mechanism wherein the centering member is sometimes pressed by the disc and moves in a direction along the rotation axis while rotating about the rotation axis of the turntable. 3. The disk chucking mechanism according to claim 2, wherein a groove or a projection of the centering member is formed on an outer peripheral surface of the centering member or an inner peripheral surface of the center shaft portion. Disk chucking mechanism. 4. The disk chucking mechanism according to claim 1, wherein the restriction on the movement of the disk holding member is released by moving the restriction member, and the holding of the disk by the centering member and the disk holding member is released. A disk chucking mechanism characterized in that: 5. The disk chucking mechanism according to claim 2, wherein the movement of the restriction member is released by moving the restriction member, and the disk holding by the centering member and the disk holding member is released. A disk chucking mechanism characterized in that: 6. The disk chucking mechanism according to claim 3, wherein the movement of the regulating member is released to release the movement restriction on the disk holding member, and the holding of the disk by the centering member and the disk holding member is released. A disk chucking mechanism characterized in that: 7. A recording / reproducing apparatus using a disk chucking mechanism having a turntable on which a disk is mounted, wherein the disk chucking mechanism is provided for centering the disk, and the disk chucking mechanism is attached to the disk when the disk is mounted. A centering member that is supported by the turntable in a state where it can be pressed and moved in the direction along the rotation axis of the turntable and that is urged away from the turntable; And is supported by the turntable so as to be movable between a first position and a second position for contacting and holding the peripheral edge of the center hole of the disk, and the position is regulated with the movement of the centering member. The disk is released and moved to the second position to hold the disk with the centering member. A disk holding member, and a regulating member that is supported so as to be movable in a direction along the rotation axis of the turntable and that regulates the movement of the disk holding member when chucking is completed. A recording / reproducing device using a disk chucking mechanism.