JP3405390B2 - Optical disk chucking mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk chucking mechanism for mounting and holding an optical disk and an optical disk drive device including the same.

[0002]

2. Description of the Related Art Compact disc (CD), digital video disc (DVD), CD-ROM, CD-RA
An optical disc such as M is rotated at high speed by a drive device when reading and writing information. This drive device is provided with a chucking mechanism for mounting and holding an optical disc on a turntable. In a chucking mechanism mounted on a desktop personal computer or the like, the chucking mechanism includes a permanent magnet on the turntable side and a clamper attracted to the permanent magnet.

Also, in a device mounted on a thin device such as a laptop computer, the chucking mechanism is
Unlike the above structure, it is installed only on the turntable side.

That is, in the conventional chucking mechanism, as shown in FIGS. 11 and 12, an optical disk (not shown) mounted on the substrate 62 of the turntable 61 is positioned at the center of the turntable 61. Three balls 65 provided on the outer peripheral wall 64 of the fitting portion 63 at equal angular intervals in the circumferential direction.
Holding by.

More specifically, an elastic member 66 made of a rubber O-ring is arranged inside the fitting portion 63, and the ball 65 contacts the elastic member 66.
The elastic member 66 urges the balls 65 outward in the radial direction, and a part of each ball 65 protrudes from the outer peripheral wall 64 and holds it by lightly crimping it to the upper edge of the central opening of the optical disk.

When removing the optical disk from such a chucking mechanism, a predetermined portion of the outer peripheral edge of the optical disk is pinched with a finger, and the portion is pulled up while inclining upward and the ball 65 is resisted against the elastic force of the elastic member 66. Push it in and remove.

As described above, when the optical disk is tilted and removed, a force such as a bending stress acts on the shaft 68 of the spindle motor 67 located below the turntable 61, the bearing 69 that supports the shaft 68, and the like. Extra bending stress acts to tilt the axial direction of the shaft 68. At this time, the shaft 68 and the bearing 69 are deformed though they are minute, and the durability of these is deteriorated.

Although the turntable 61 and the rotor 70 of the spindle motor 67 are required to have a high degree of coaxiality,
When the above-mentioned stress acts, the coaxiality is reduced, the shaft 68 is shaken, and there is a possibility that the reading and writing of information on the optical disc may be adversely affected.

Further, the method of pinching the outer peripheral edge of the optical disk with fingers and removing the optical disk may not be surely performed due to the applied force, and there is a problem in that the operability of removing the optical disk is poor.

Further, conventionally, since the turntable 61 and the rotor 70 of the spindle motor 67 are separate structures, it is difficult to obtain a high degree of coaxiality with the spindle motor 67 when the turntable 61 is assembled, and the number of parts is small. As the number of optical discs increases, the entire drive device for optical disks tends to become thicker. As a result, there is a problem in that the device becomes smaller, particularly, the notebook computer becomes thinner, and the cost also increases.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to enable easy and reliable attachment / detachment of an optical disk, and accordingly a rotary shaft and its Reduces bending stress acting on the periphery,
It is to provide an optical disc chucking Organization capable of suppressing the adverse influence such as reduction of the axial deflection and durability.

[0012]

In order to achieve the above-mentioned object, the present invention provides an optical disk chucking mechanism which is installed concentrically with the rotation shaft of a rotor of a motor and which mounts and holds an optical disk. a fitting section that match fitted in the center opening of the optical disc is normally urged by the inclined surface and the biasing means Te over path portion radially outward, in the mounted state of the optical disc skilled in the upper surface of the central opening of the optical disc a plurality of contact members in contact, the addition to alleviating or releasing the urging of the contact member, and operation means for moving in a direction to discharge the optical disc in an attached state, prior to urging the operating means to the upper surface
And a serial biasing means, said operating means, said biased in one axial end side of the rotary shaft can move in the axial direction of the rotary shaft by the biasing means, and the the upper surface taper portion
An operating member having a fitting portion with a slope formed , and a plurality of sliding bodies that are slid in the radial direction by the fitting portion in conjunction with a pressing operation of the operation member and that have a slope, As the sliding body slides outward in the radial direction, the inner edge of the center opening of the optical disk is pressed by the slant surface of the sliding body to move the front edge.
Move the optical disc in the direction of the upper surface , and
The contact member along the inclined surface of the taper portion and the direction of the rotation axis
Is configured so that moving to.

[0013]

[0014]

[0015]

(4) A biasing means for biasing the operating member toward one end of the rotary shaft in the axial direction is provided, and the abutting member is biased radially outward through the operating member. The chucking mechanism for an optical disc according to (2) or (3) above.

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[ Operation ] By pressing the operation member, the optical disk class
Pump is released, and at the same time, slide the inner edge of the center opening of the optical disc.
The moving body pushes and moves in the direction to eject the optical disc.
It

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION An optical disk chucking mechanism and a motor according to the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

1 to 10 show embodiments of an optical disk chucking mechanism and an optical disk drive device according to the present invention. Since the chucking mechanism of the optical disk shown in these figures is usually attached in a state in which the upper and lower positions thereof are as shown in FIG. 1, hereinafter, the upper side of FIGS. The side is described as "bottom".

As shown in FIGS. 1 to 10, an optical disk drive device 50 of the present invention mounts and holds an optical disk D and a spindle motor 8 including a stator 23 and a rotor 9 rotating with respect to the stator 23. It is composed of a chucking mechanism 1. The chucking mechanism 1 is
It is installed concentrically with the rotating shaft 14 of the rotor 9.

The chucking mechanism 1 has a function of aligning the optical disc D, and mainly includes a fitting portion 2 that fits (or loosely fits) in the central opening of the optical disc D, and the inside of the fitting portion 2. Button (operation member) 3 arranged on the
Urging means 4 acting on the outer peripheral wall 5 of the fitting portion 2, a plurality of balls (contact members) 6 arranged on the outer peripheral wall 5 of the fitting portion 2, and a plurality of sliding bodies 7 also arranged on the outer peripheral wall 5 of the fitting portion 2. Composed of and.

The fitting portion 2 is formed in a central portion of the rotor 9 of the spindle motor 8 and is bulged upward in a substantially cylindrical shape in a plan view. The fitting portion 2 has a circular shape at the center of the top wall 10. The opening 11 is formed.

The button 3 is composed of a disk-shaped member, and has a claw-shaped engaging edge 12 over the entire circumference at the outer peripheral edge of the lower end thereof. A tapered surface 121 having an outer diameter gradually decreasing upward is formed on the upper portion of the engaging edge 12, and each ball 6 abuts on the tapered surface 121.

The upper portion of the button 3 is loosely fitted in the opening 11 of the fitting portion 2 and is exposed at substantially the same height as the top wall 10 of the fitting portion 2. In addition, a circular opening 13 into which the central protrusion 151 of the holder 15 can be inserted is formed in the center of the button 3.
Are formed.

The urging means 4 is composed of a coil spring in a compressed state, and both ends of the urging means 4 are in contact with the upper back surface of the holder 15 and the button 3, respectively, and urge the button 3 upward. Three balls (spheres) 6 are arranged on the outer peripheral wall 5 of the fitting portion 2 at equal angular intervals in the circumferential direction. The balls 6 have the same diameter.

The outer peripheral wall 5 is provided with three first sliding holes 16 extending in the vertical direction (axial direction of the rotary shaft 14), and each ball 6 is formed in each first sliding hole 16 in the first sliding hole 16. Is located in. Each ball 6 can move in the radial direction so as to project outward from the outer peripheral wall 5, and can also move in the vertical direction along the first sliding hole 16.

The sliding bodies 7 are arranged on the outer peripheral wall 5 of the fitting portion 2 at equal angular intervals in the circumferential direction, the same number as the balls 6, that is, three (plural). In this case, the sliding bodies 7 are installed at positions facing each other via the axis of the rotary shaft 14. The shape of each sliding body 7 is the same.

The outer peripheral wall 5 is provided with three second sliding holes 17 extending in the vertical direction, and each sliding body 7 can slide in each second sliding hole 17 in the radial direction. Has been inserted into. In this case, a convex portion 71 to be inserted into a groove formed in the holder 15 is formed in the lower portion of the sliding body 7 and slides using the groove as a rail.

As shown in FIG. 10, a first guide surface 18 is formed on the outer surface in the radial direction of each sliding member 7 so as to project outward as it goes downward, and on the opposite side thereof, a first guide surface 18 is formed. A second guide surface 19 is formed so as to incline so as to project inward as it goes downward. As the sliding body 7 slides in the radial direction, the first guide surface 18 moves toward the outer peripheral wall 5
The second guide surface 19 can project further outward, and the second guide surface 19 can project further inward than the outer peripheral wall 5.

The inclination angle θ ₁ of the first guide surface 18 is not particularly limited, but is preferably about 45 to 80 °, 60
More preferably, it is about 80 °. Also, the second guide surface 1
The inclination angle θ _{2 of} 9 is not particularly limited, but is 30 to 60.
The degree is preferably about 40 °, more preferably about 40 to 50 °.
Further, θ ₂ ≦ θ ₁ is preferable, θ ₂ <θ ₁ is more preferable, and 1.4 θ ₂ ≦ θ ₁ ≦ 2.0 θ ₂ is further preferable. When such a condition is satisfied, the sliding body 7 operates more smoothly in conjunction with the pressing operation of the button 3, and the optical disc D can be reliably moved upward a sufficient distance and ejected.

The engaging edge 12 of the button 3 is configured to engage with each ball 6 and also with the second guide surface 19 of the sliding body 7.

Therefore, when the urging means 4 urges the button 3 upward, this urging force is transmitted to the ball 6 via the tapered surface 121 of the engagement edge 12, and urges the ball 6 radially outward. To do. However, since the width of the first sliding hole 16 is less than the diameter of the ball 6, the ball 6 cannot pass through the first sliding hole 16, and thus the ball 6 moves in the first sliding hole 16. It stops when it protrudes to some extent from the hole 16.

The stator 23 of the spindle motor 8 is mainly composed of a base plate 24 and a sleeve 25 erected at the center thereof.
And a stator core 27 fitted and fixed to the outer periphery of the sleeve 25, and a coil (winding) 28 wound around the stator core 27 directly or via a bobbin.

Inside the sleeve 25, two bearings 26 are provided.
Is inserted (press-fitted) and fixed. A sliding bearing (oil-impregnated bearing) is used as the bearing 26. And
The rotary shaft 14 of the rotor 9 is rotatably supported by both bearings 26.

On the other hand, the rotor 9 mainly comprises a holder 15 into which the upper end of the rotary shaft 14 is fitted, a yoke 20 fixed to the holder 15, and a permanent magnet fixed to the inner surface of the outer peripheral wall of the yoke 20. 22 and 22. The fitting portion 2 is joined or integrated with the holder 15 and / or the yoke 20. In this case, the holder 15,
Both the yoke 20 and the fitting portion 2 are installed concentrically with respect to the rotating shaft 14.

The permanent magnet 22 may be a multi-pole magnetized ring-shaped one or a plurality of arc-shaped (straw-shaped) cross-sections arranged along the circumferential direction.

A rubber sheet (anti-slip member) 21 is attached to the upper surface of the yoke 20 to prevent slippage when the optical disc is mounted, held and rotated. This york 2
0 also has a function as a substrate of the turntable. That is, the chucking mechanism 1 is integrated with the rotor 9 to form a turntable. This allows
The number of parts can be reduced, the structure can be simplified, and the overall thickness of the drive device 50 can be reduced. Further, unlike the conventional case, when the separate turntable is mounted on the spindle motor, there is no problem that the coaxiality is lowered due to an error in the mounting position or the like.

A hall element 29 for detecting the position of the rotor 9 is provided at a position corresponding to the permanent magnet 22 of the substrate 24, and a position above the rotor 20 in the axial direction is provided outside the yoke 20. And a stopper 30 that regulates

A bush 31 and a washer 32 are provided at the lower portion of the sleeve 25, and the lower end of the rotary shaft 14 abuts on the washer 32 to regulate the axially downward position of the rotor 9.

A washer 33 is also mounted on the upper surface of the upper bearing 26. The washers 32 and 33 are
It has a function of shutting off the lubricating oil coming out of the bearing 26.

In such a spindle motor 8, when the coil 28 is energized, a torque is generated by the generated magnetic field and the permanent magnet 22, and the rotor 9 and the chucking mechanism 1 are rotated about the rotating shaft 14 at a constant speed in a predetermined direction. Rotate.

Next, the operation of the chucking mechanism 1 and the drive device 50 will be described with reference to FIGS.

When mounting the optical disc D, the optical disc D is held by hand, and the optical disc D is pushed downward while aligning the central opening of the optical disc D so as to be inserted into the fitting portion 2. At this time, the lower part of the inner peripheral edge H of the central opening abuts each ball 6,
The ball 6 is moved to the inside of the fitting portion 2 against the urging force of the urging means 4.
Push in.

As shown in FIG. 5, after the inner peripheral edge H of the optical disc D has passed over the ball 6, the ball 6 again projects outward from the outer peripheral wall 5 of the fitting portion 2 by the urging force of the urging means 4. Force is applied to the upper portion of the inner peripheral edge H to press the optical disc D downward. As a result, the lower surface of the optical disc D around the center opening is pressure-bonded to the rubber sheet 21, and is securely mounted and held without slipping.

In this disc mounted state, since the balls 6 are provided at equal angular intervals in the circumferential direction, the balls 6 hold the optical disc D with equal force distribution from the inside of the center opening thereof. Therefore, the coaxiality between the optical disc D and the rotating shaft 14 is extremely high, and when the optical disc D is rotated at a high speed, adverse effects such as vibration due to eccentricity do not occur.

When the optical disc is mounted, the inner peripheral edge H engages with the vicinity of the lower end of the first guide surface 18 of the sliding body 7 and pushes the sliding body 7 into the fitting portion 2. (See Figure 5).

When removing the optical disk D from the chucking mechanism 1, first, as shown in FIG. 6, the button 3 is pushed downward with a finger or the like against the urging force of the urging means 4. At the initial stage of this pressing operation, the engaging edge 12 descends, so that the outward bias in the radial direction of the ball 6 is gradually relaxed and released, and the engaging edge 12 moves toward the sliding body 7. It contacts the upper end of the second guide surface 19.

As shown in FIG. 7, when the button 3 is pushed further deeply until the central protrusion 151 of the holder 15 is inserted into the opening 13, the engaging edge 12 slides along the second guide surface 19. , The respective sliding bodies 7 are slid outward in the radial direction of the fitting portion 2. With this sliding outward, the inner peripheral edge H of the optical disc D and the first guide surface 18 are engaged, so that the lower portion of the inner peripheral edge H moves upward along the first guide surface 18. When the sliding body 7 slides toward the outermost side, the optical disc D rises to the first level L ₁ and stops.

When the optical disc D moves upward, the urging force of each ball 6 outward in the radial direction is relaxed or released, so that the inner peripheral edge H of the optical disc D easily crosses the ball 6. You can

At this time, each sliding body 7 receives a reaction force from the inner peripheral edge H of the optical disc D. This reaction force has a vector component in the axial direction (thrust direction) of the rotating shaft 14,
Although it can be decomposed into a vector component that goes inward in the radial direction,
Since the sliding bodies 7 are provided at equal angular intervals in the circumferential direction, the total of the vector components in the radial direction acting on the three sliding bodies 7 cancel each other out to be almost zero. Therefore, the bending stress that tilts the axis hardly acts on the rotating shaft 14, and the three sliding bodies 7
A uniform lifting force acts on the entire optical disc D, and the optical disc D rises without tilting, that is, while maintaining a state parallel to the yoke 20.

Next, as shown in FIG. 8, when the finger is released from the button 3, the urging force of the urging means 4 raises the button 3. With this rise, since the engagement edge 12 is engaged with the lower side of each ball 6, each ball 6 is also lifted upward and abuts on the lower portion of the inner peripheral edge H of the optical disc D.

Further, as shown in FIG. 9, each ball 6 is urged by the urging force of the urging means 4 to the outside in the radial direction of the fitting portion 2 via the engaging edge 12 of the button 3, and in the same direction. Move to. As a result, each ball 6 further raises the optical disc D. When each ball 6 projects most outwardly, the optical disc D rises to a _second level L ₂ located above the first level L ₁ . This state is equal to the state before the disc is mounted.

It should be noted that even if the finger is released from the button 3 and the button 3 returns to the original state shown in FIG. 5, the respective sliding bodies 7 are maintained in the same state (the state protruding from the outer peripheral wall 5 to the outside). However, when the optical disc D is mounted on the chucking mechanism 1 next time, the lower part of the inner peripheral edge H of the optical disc D contacts the first guide surface 18 of the sliding body 7, and the lower part of the inner peripheral edge H becomes the first part. Since the sliding body 7 is pushed into the inside of the fitting portion 2 by sliding along the guide surface 18 of No. 1, there is no hindrance to the next attachment / detachment of the optical disc D.

As described above, the sliding body 7 and the ball 6 cooperate with each other in two steps (elevation to the _first level L ₁ and second level L) by an extremely simple operation of pressing and releasing the button 3.
₂ ), the optical disc D can be removed from the chucking mechanism 1, and at that time, almost no bending stress acts on the rotating shaft 14 and the bearings 26 and the like around the rotating shaft 14 and the bearings 26. Maintain high durability, etc.,
Moreover, it is possible to prevent the coaxiality from being impaired.

In this embodiment, since each ball 6 is movable in the radial direction and the axial direction of the rotary shaft 14, the optical disc D has a nonstandard thickness, that is, slightly thicker or thinner than the standard. Even if it is a thing, there is an advantage that it can be surely held and the removal operation can be surely performed.

Furthermore, in recent years, it has been a problem to rotate the optical disc D at a higher speed (the number of revolutions is an integral multiple), and accordingly, in the chucking mechanism as well, in order to prevent slippage, a higher clamping force is required. Although a force is required, in the present embodiment, the coil spring that is the biasing means 4 can be appropriately selected and replaced with one having a different spring constant (spring elasticity), thereby adjusting the clamping force of the optical disc D. Therefore, it is possible to sufficiently deal with the above-mentioned problems.

The chucking mechanism and the motor of the present invention have been described above with reference to the embodiments shown in the accompanying drawings. However, the present invention is not limited to this, and the configuration of each part exhibits the same function. It can be replaced with any that is obtained.

For example, the number of the balls 6 and the slide bodies 7, the installation positions, the arrangements, etc. are not limited to those shown in the drawings. Also,
The form of the contact member is not limited to the ball 6, and may be, for example, a claw or a protrusion. Further, the slide body 7 or a member corresponding thereto may be connected or integrated with the operation member (button 3).

Further, the urging means 4 is not limited to the coil spring, and may be constituted by another form of spring or an elastic body such as rubber.

[0070]

As described above, according to the present invention, the optical disk can be removed by a simple operation, particularly by pressing and releasing the button, and at that time, the rotating shaft of the rotor and the bearing can be removed. Since the bending stress is suppressed from acting on the rotor, the durability of the rotating shaft and bearing is improved, and high coaxiality with the rotating shaft of the rotor is maintained, thus preventing shaft runout due to rotation. It contributes to improvement of the accuracy of reading and writing information on the optical disc.

When the chucking mechanism is integrated with the rotor of the motor, the number of parts can be reduced, the structure can be simplified, the thickness can be reduced, and the assembling can be facilitated. This is advantageous when applied to an optical disk drive device of a notebook type personal computer to be used.

Further, when the optical disk is constructed to be sequentially moved to the first level and the second level by the cooperation of the sliding member and the abutting member, the optical disk is surely ejected to the upper level. Easier to take out.

Further, when the contact members are arranged on the outer peripheral portion of the fitting portion at equal angular intervals along the circumferential direction, when the optical disc is mounted and held, the optical disc with respect to the rotation axis of the rotor is The coaxiality can be further improved.

When the sliding bodies are arranged on the outer peripheral portion of the fitting portion at equal angular intervals along the circumferential direction, the sliding members are installed at positions facing the contact members via the axis of the rotary shaft. If so, the optical disc can be ejected more smoothly and reliably.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a chucking mechanism of the present invention and a drive device including the chucking mechanism.

FIG. 2 is a cross-sectional view taken along the line AA in FIG.

FIG. 3 is a left side view of the fitting portion in FIG.

FIG. 4 is a right side view of the fitting portion in FIG.

FIG. 5 is a vertical cross-sectional view of a chucking mechanism when an optical disc is mounted and held.

FIG. 6 is a vertical cross-sectional view of the chucking mechanism in a state where the operation member is slightly pushed.

FIG. 7 is a vertical cross-sectional view of the chucking mechanism in a state where the operating member is pushed deeply.

FIG. 8 is a vertical cross-sectional view of the chucking mechanism immediately after the operation member is released.

FIG. 9 is a vertical cross-sectional view of a chucking mechanism when ejection of an optical disc is completed.

FIG. 10 is a side view for explaining the configuration of the sliding body.

FIG. 11 is a vertical cross-sectional view showing the configuration of a conventional optical disk drive device having a chucking mechanism.

12 is a cross-sectional view taken along the line BB in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Chucking mechanism 2 Fitting part 3 Button 4 Biasing means 5 Outer peripheral wall 6 Ball 7 Sliding body 71 Convex part 8 Spindle motor 9 Rotor 10 Top wall 11 Opening 12 Engaging edge 121 Tapered surface 13 Opening 14 Rotating shaft 15 Holder 151 Central protrusion 16 First sliding hole 17 Second sliding hole 18 First guide surface 19 Second guide surface 20 Yoke 21 Rubber sheet 22 Permanent magnet 23 Stator 24 Substrate 25 Sleeve 26 Bearing 27 Stator core 28 Coil 29 Hall element 30 Stopper 31 Bushings 32, 33 Washer 50 Drive device D Optical disc H Inner peripheral edge θ ₁ , θ ₂ Inclination angle L ₁ First level L ₂ Second level 61 Turntable 62 Board 63 Fitting part 64 Outer peripheral wall 65 Ball 66 Elastic member 67 Spindle motor 68 Shaft 69 Bearing 70 Rotor

Continuation of the front page (56) Reference JP-A-5-298798 (JP, A) JP-A-8-36830 (JP, A) JP-A-7-57382 (JP, A) Actually open 4-1-11033 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 17/022-17/035

Claims (8)

(57) [Claims] 1. A installed motor rotor concentrically with the rotary shaft, mounted an optical disk, a optical disk chucking mechanism for holding, that match fitted in the center opening of the optical disc
A fitting portion, is normally urged by the inclined surface and the biasing means Te over path portion radially outward, and a plurality of contact members in contact with the upper surface of the central opening of the optical disc in mounted state of the optical disc, the person Operating means for relaxing or releasing the urging of the contact member, and moving the mounted optical disk in the ejecting direction, and the urging means for urging the operating means toward the upper surface side.
The operating means is urged by the urging means toward one end side in the axial direction of the rotating shaft to be movable in the axial direction of the rotating shaft , and the inclined surface of the tapered portion is formed on the upper surface. Mating
An operating member having a portion , and a plurality of sliding bodies that are slid in the radial direction by the fitting portion in conjunction with the pressing operation of the operating member and that have slant surfaces, The inner edge of the center opening of the optical disc is pressed by the slant surface of the slide body to move the optical disc in the direction of the upper surface , and the contact member is moved to the taper portion.
Chucking mechanism of the optical disk that is configured to so that is moved in the direction of the rotation axis along the slope. 2. Each of the sliding bodies has a guide surface that comes into contact with the inner edge of the central opening of the optical disc, and when the sliding bodies slide radially outward by the pressing operation of the operating member, the central opening of the optical disc. The optical disk chucking mechanism according to claim 1, wherein the inner edge is configured to slide along the guide surface and to be ejected. 3. The chucking mechanism for an optical disc according to claim 1, wherein the sliding bodies are arranged on the outer peripheral portion of the fitting portion at equal angular intervals along the circumferential direction. 4. The chucking mechanism for an optical disk according to claim 1, wherein the sliding body and the abutting member are installed at positions facing each other with the axis of the rotating shaft interposed therebetween. 5. The chucking mechanism for an optical disc according to claim 1, wherein the abutting members are arranged on the outer peripheral portion of the fitting portion at equal angular intervals along the circumferential direction. 6. A chucking mechanism for an optical disk, which is installed concentrically with a rotation shaft of a rotor of a motor and mounts and holds the optical disk, wherein the fitting section is fitted into a central opening of the optical disk, and the fitting section. An operating member that is arranged movably in the axial direction of the rotating shaft inside and has an engaging edge on the periphery,
A biasing unit that biases the operating member toward one end of the rotary shaft in the axial direction, and a biasing unit that is installed on the outer peripheral portion of the fitting portion, is movable in at least a radial direction, and is operated by the biasing unit via the operating member. A plurality of contact members that are constantly urged outward in the radial direction and contact the upper surface of the central opening of the optical disk when the optical disk is mounted, and a pressing operation of the operating member that is provided on the outer peripheral portion of the fitting portion. A plurality of sliding bodies capable of sliding in the radial direction in conjunction with each other, each of the sliding bodies abutting on the inner edge of the central opening of the optical disc, and a first guide surface inclined with respect to the axis of the rotating shaft, A second guide surface that abuts on the engagement edge, and when the operation member is pressed while the optical disc is mounted, the engagement edge causes the second guide surface of each of the sliding bodies. By pressing to slide each of the slide bodies radially outward, It said first guide surface presses the central opening inner edge of the optical disk by the sliding, of the optical disk, characterized by operating to move in the direction of discharging the disc chucking mechanism. 7. A chucking mechanism for an optical disk, which is installed concentrically with a rotation shaft of a rotor of a motor and mounts and holds the optical disk, wherein the fitting section is fitted into a central opening of the optical disk, and the fitting section. An operating member that is movably arranged in the axial direction of the rotating shaft and has an engaging edge on the periphery thereof; a biasing means that biases the operating member toward one end side in the axial direction of the rotating shaft; It is installed on the outer peripheral portion of the joint portion, is movable in at least the radial direction, and is constantly urged radially outward by the urging means via the operating member. A plurality of abutting members to abut, and provided on the outer peripheral portion of the fitting portion,
A plurality of sliding bodies that can slide in the radial direction in conjunction with the pressing operation of the operating member, each of the sliding bodies contacting the inner edge of the center opening of the optical disc and tilted with respect to the axis of the rotating shaft. A first guide surface and a second guide surface that is in contact with the engagement edge and is inclined in a direction opposite to the first guide surface. When the pressing operation is performed against the urging force of the urging means, the urging of the abutting members is relaxed or released, and the engaging edge presses the second guide surface of each of the sliding bodies. The respective sliding bodies are slid outward in the radial direction, and by this sliding, the first guide surface presses the inner edge of the central opening of the optical disc to move the optical disc to the first level, and then the operating member is moved. When the pressure is released, the biasing force of each contact member is restored and each contact member is pressed. Member presses the central opening inner edge of the optical disc, an optical disc, characterized by operating to move the optical disc to the second level chucking mechanism. 8. The contact member is a ball.
8. A chucking mechanism for an optical disc according to claim 7.