JP4062863B2 - Disc chucking mechanism and recording / reproducing apparatus using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disc chucking mechanism for placing, holding, and rotating a disc-shaped recording medium and a technique for facilitating the removal of the disc in a recording / reproducing apparatus using the disc chucking mechanism.
[0002]
[Prior art]
In an apparatus for recording and reproducing information using a disk-shaped recording medium, a chucking mechanism for the recording medium is provided. For example, various chucks using a ball-type chucking mechanism or a disk holding claw are provided. A king mechanism (for example, a configuration in which a holding force in the disk radial direction is obtained by a plurality of claw members biased by a spring force in a centrifugal direction at a predetermined angular interval around a rotation axis) is known. ing.
[0003]
[Problems to be solved by the invention]
However, the conventional apparatus has the following problems.
[0004]
In the conventional chucking mechanism, it is necessary to lift the disk and apply a force sufficient to release the disk chucking at that time (that is, a spring that provides a holding force at the time of disk chucking). Therefore, if an excessive force is applied to the disc, the disc may be deformed in the worst case.
[0005]
In order to increase the disk reading speed, it is necessary to increase the frictional force in order to increase the holding force with respect to the disk. For this purpose, it is necessary to increase the biasing force such as spring force. For example, when the spring force is increased in a configuration in which the holding force in the radial direction of the disk is defined by three claw members and a spring member connected thereto, the claw member moves during disk chucking. This makes it difficult to mount the disc on the turntable, or in the worst case, an excessive force may be applied to cause the disc to crack. In order to avoid such an inconvenience, for example, a mechanism for releasing the holding force of the disk at the time of disk chucking may be provided. However, if the configuration becomes complicated for that purpose, the number of parts must be greatly increased. The problem remains.
[0006]
  The present invention makes it possible to take out the disk without difficulty in the disk chucking mechanism, and for that reason, the number of parts and assembly man-hours are greatly increased.InThe challenge is not to increase it.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention includes the following constituent elements.
[0008]
・ Turntable on which the disc is placed.
[0009]
・ It is provided for centering of the disc, and is supported by the turntable in such a state that it can be moved in the direction along the rotation axis of the turntable by being pushed by the disc when the disc is loaded, and is urged away from the turntable. Centering member.
[0010]
-Supported by the turntable in a movable state 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 holds the disk with the centering member by moving the position restriction to a second position with the movement of the centering member.
[0011]
  A regulating member that is supported in a movable state along the rotation axis of the turntable and regulates the movement of the disc holding member when chucking is completed.
  The movement restriction on 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.
[0012]
  Therefore, according to the present invention, since 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, the disc can be taken out without difficulty. 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 it is possible to prevent an excessive force from being applied to the disc and the apparatus at the time of mounting.Furthermore, the movement restriction on the disk holding member is released by moving the restriction member, and thereby the disk holding can be released and the disk can be easily taken out from the chucking mechanism, so that the disk is not damaged. .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 schematically shows a main part of the configuration of the recording / reproducing apparatus 1, and includes a disk chucking mechanism 3 for the disk 2 and an optical head device 4.
[0014]
Examples of the disk 2 include an optically readable disk such as a compact disk (CD), a magneto-optical disk, a phase change disk, and the like, and a disk shape having a central hole (center hole) formed at the center of the disk. All recording media are included in the scope. Further, the recording / reproducing apparatus 1 includes not only a reproducing or recording-dedicated apparatus but also an apparatus capable of both reproducing and recording, and it does not matter whether it is stationary or portable.
[0015]
The disk chucking mechanism 3 is a turntable (or a disk table, a clamper, a spindle hub) as a rotary mounting member for mounting a disk and rotating it with the power of a drive source (spindle motor 5 is shown in the figure). Etc.) and a holding member for holding the disc with the centering member as will be described later.
[0016]
The optical head device 4 is used to reproduce information recorded on the disk 2 (in a narrow sense optical pickup) or to record information on the disk 2, and includes a lens system including an objective lens 4a, a light source , Photodetection means (photo detector, etc.), focus and tracking control mechanism, and the like.
[0017]
2 and 3 are diagrams for explaining the basic configuration of the disk chucking mechanism 3. FIG. 2 is a plan view, and FIG. 3 is rotated for easy understanding in explaining the chucking operation. The axis is the center line (this is referred to as “CL”), the state when the disc is loaded on the left half, and the state when chucking is completed on the right half, showing both states in contrast. It is.
[0018]
The disk chucking mechanism 3 includes the following components (the numbers in parentheses indicate symbols).
[0019]
・ Turntable (6)
・ Centering member (7)
.Disk holding member (8)
-Restricting member (9).
[0020]
About the turntable 6, the motor shaft 10a is attached to the center cylindrical part 6a by press fit so that it may be rotated by the motor 10 (refer FIG. 3). In the configuration shown in the figure, the turntable 6 is composed of a disk mounting portion 6b and a rotor case 6c, and a cushioning member is provided on a portion of the disk mounting portion 6b near the outer peripheral edge of the surface on which the disk 2 is mounted. As shown, an annular rubber sheet 6d is attached. The motor 10 is attached to and supported by the chassis 11.
[0021]
The centering member 7 is a member provided for centering (center positioning) of the disk 2 and prevents the disk from rotating in an eccentric state with respect to the rotation center axis (the center axis of the motor shaft). Is. The centering member 7 is received in a 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 moved in a direction along the rotation axis of the turntable 6. Yes. It is urged upward in the figure by urging means 13 (shown in the figure is a coil spring whose outer shape forms a truncated cone shape) provided between the disk mounting portion 6b and the centering member 7. . Further, an inclined 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 is brought into contact therewith.
[0022]
As shown on 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 around the rotation center axis of the turntable 6 at an angular interval of 120 °, and the center hole 2a of the disk 2 is provided. This is the most preferable form from the viewpoint of the number of parts. However, as far as the present invention is concerned, there is no limitation on the number and arrangement of the disk holding members.
[0023]
As shown in the left half view of FIG. 3, the disk holding member 8 has a first position where it does not contact the peripheral edge of the center hole 2 a of the disk 2, and as shown in the right half view of FIG. 3, The disc 2 is supported by the turntable 6 so as to be movable over a second position that contacts and holds the periphery of the center hole 2a of the disc 2. That is, in the configuration shown in the figure, the claw portion 8a is formed on the disc holding member 8. However, the claw portion 8a does not contact the disc 2 at the first position, and the center hole 2a is not attached when the disc is loaded. The inner peripheral edge of the center hole 2 a comes into contact with the inclined surface 7 a of the centering member 7. In the second position, the claw portion 8a is moved away from the rotation center axis of the turntable 6, and the disk 2 (the edge portion of the center hole 2a) is located between the claw portion 8a and the centering member 7. It is pinched.
[0024]
As for the movement (including tilting, rotation, etc.) of the disk holding member 8 to the second position, the disk holding member 8 is moved along with the movement of the centering member 7 (movement in the direction along the rotation center axis). This is done by releasing the position restriction for 8. In other words, in the configuration shown in the figure, the end 8b of the disc holding member 8 opposite to the side where the claw portion 8a is provided is mounted in a rotatable state in the recess 12 of the turntable 6 (turn The connecting portion with the table 6 has a rotation fulcrum.) The position restriction with respect to the disc holding member 8 is a cam portion 14 formed on the inner peripheral surface (position restricting surface) of the hole 7b formed in the centering member 7. 14 and 14 (see FIG. 2) are released at the maximum radial position. These cam portions are formed at an angular interval of 120 ° around the rotation center axis (center axis of the motor shaft 10a), and the cam portion 14 is formed on the inner peripheral surface of the hole 7b of the centering member 7. The distance between this portion and the 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 smaller in the other portions.)
[0025]
Therefore, as shown on the left side of FIG. 3, in a state where the disc holding member 8 is in contact with the inner peripheral surface of the hole 7b (the portion of the minimum radius where the cam portion 14 is not formed), the disc holding member 8 is concerned. Is controlled on the motor shaft 10a side so as not to approach the center hole 2a of the disc 2, but the centering member 7 rotates and the disc holding member 8 is the maximum of the cam portion 14 as shown on the right side of FIG. Since the disk holding member 8 is at a position corresponding to the radius portion, the disk holding member 8 is allowed to rotate in a direction far from the motor shaft 10a. Therefore, by restricting the position of the disk holding member 8 so as not to fall to the motor shaft side by a restriction member 9 described later, the claw portion 8a of the disk holding member 8 is slightly protruded to the disk side. Is held between the claw portion 8a of the disk holding member 8 and the inclined surface 7a of the centering member 7 at the edge of the center hole 2a.
[0026]
The restricting member 9 is supported so as to be movable in a direction along the rotation center axis of the turntable 6 and also serves to restrict (or prevent) the movement of the disc holding member 8 at the second position when the chucking is completed. Have The restriction member 9 may have any shape regarding the shape of the restriction member 9 and the movement restriction with respect to the disk holding member 8, but the restriction member 9 is inserted into the central cylindrical portion 6a of the turntable 6 as illustrated. A biasing means 15 (a coil spring is shown in FIG. 3) that is a center cap and is interposed between the center cap and the turntable 6 is used to apply a biasing force in the direction away from the turntable 6 to the center cap. Use of the assigned configuration has an advantage that the number of parts is not significantly increased. Further, in the state shown on the right side of FIG. 3, the protrusion 9a formed on the regulating member 9 is brought into contact with the protrusion 8c formed on the back surface (the surface opposite to the claw 8a) of the disk holding member 8. This prevents the disc holding member 8 from tilting toward the motor shaft 10a.
[0027]
Thus, in the configuration described above, when the disc is loaded, the center hole 2a of the disc 2 is brought into contact with the inclined surface 7a of the centering member 7 so as to be inserted into the regulating member 9 as shown on the left side of FIG. Let At that time, the centering member 7 moves (lowers) toward the turntable 6 against the force of the biasing means 13 when pressed by the disk 2, but the centering member 7 does not simply move. The member moves in the direction along the rotation axis while rotating around the rotation axis of the turntable 6. That is, since the centering member 7 has the cam portion 14 on the inner peripheral surface of the hole 7b, it is necessary to release the position restriction so that the disk holding member 8 is moved to the second position by rotation. is there.
[0028]
As a configuration for spiral movement of the centering member 7, a groove or a protrusion may be formed in the member, and a protrusion or a groove that engages with the turntable 6 may be formed. A form is mentioned.
[0029]
(A) Form which formed the groove | channel or the protrusion in the internal peripheral surface of the hole formed in the center axis | shaft part of a centering member
(B) The form which formed the groove | channel or the protrusion in the (outer) peripheral surface of the outer periphery part of a centering member.
[0030]
These details will be described in the description of the embodiment described later. As a configuration for moving the centering member in the direction along the rotation center axis, the engagement between the groove and the protrusion is used. There is an advantage that an increase in the number of parts can be suppressed by adopting a simple mechanism.
[0031]
In the figure on the left side of FIG. 3, the restriction member 9 moves toward the turntable 6 against the force of the biasing means 15 and sinks. The disk holding member 8 is the centering member 7. The position is regulated by the inner peripheral surface of the hole 7b and falls to the motor shaft 10a side, and the slope formed on the projection 8c of the disk holding member 8 is brought into contact with the projection 9a of the regulation member 9, and this is turned into a turntable. This is because it is pushing to the 6th side.
[0032]
On the other hand, when the chucking is completed, as shown on the right side of FIG. 3, the disc holding member 8 is in a position corresponding to the maximum radius portion of the cam portion 14 of the centering member 7 (that is, the disc holding member 8 has this position). At that time, the claw portion 8a has a degree of freedom in the direction in which the inner peripheral edge of the disc center hole 2a is gripped.) Since the projection 8c is in contact with the projection 9a of the regulating member 9, the disc is held. The member 8 is raised on the disk side.
[0033]
The disc 2 is placed on the turntable 6 via the rubber sheet 6d, and the edge portion of the center hole 2a is sandwiched between the claw portion 8a of the disc holding member 8 and the inclined surface 7a of the centering member 7. . Note that the holding force at this time depends on the force of the biasing means 13. Further, since the regulating member 9 is urged in the direction away from the turntable 6 by the force of the urging means 15, when the disc holding member 8 is tilted to the disc side, the projection 9a is inclined by the inclined surface of the projection 8c. Since there is no position restriction, it is lifted upward in the figure. At that time, the limit position (upper limit position) of the restricting member 9 is such that the annular protrusion 9b (a portion whose cross-sectional shape is a triangular shape in FIG. 3) formed on the restricting member 9 is the restricting piece 8d (nail) Formed on the back side of the portion 8a).
[0034]
Therefore, in order to take out the disk 2 in this state, the regulating member 9 lifted upward in the drawing is pressed against the turntable 6 side with a finger or a release member (ejecting member), and the regulating member 9 is moved. As a result, the movement restriction on the disc holding member 8 is released, and the disc holding member 8 is tilted toward the motor shaft 10a (because the centering member 7 moves while rotating to return to the original state). The holding of the disc by the centering member 7 and the disc holding member 8 is released. That is, when the restricting member 9 is pressed, the restriction on the disc holding member 8 is released, and the disc holding member 8 can be tilted toward the motor shaft 10a to obtain a degree of freedom in that direction. As described above, since the force in the direction away from the turntable 6 is constantly acting on the disk 2 by the centering member 7 and its biasing means 13, it is pushed back together with the centering member 7 in the figure. At the same time, since the centering member 7 is lifted while rotating, the disc 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 disc 2 is centered. Is lifted to the position farthest from the turntable 6, the claw portion 8 a of the disk holding member 8 is completely separated from the disk 2.
[0035]
In this way, the disk 2 can be easily taken out simply by pushing the regulating member 9 toward the turntable 6, so that there is no worry that an excessive force is applied to the disk. Further, even if the biasing force on the centering member 7 is increased in order to increase the holding force on the disc 2, the chucking of the disc can be easily released simply by applying a force (pressing force) required for the movement of the regulating member 9. Can do. In addition to the turntable 6, the number of parts constituting the mechanism is limited to several points including the centering member 7, the disk holding member 8, the regulating member 9, and the urging means 13, 15. And workability at the time of assembly is not deteriorated.
[0036]
In the chucking mechanism according to the present invention, the disc is held by the mechanism for restricting or releasing the posture of the disc holding member by the cam portion (rotation) formed on the centering member, and the disc holding member and the centering member. A mechanism for pinching at the edge portion of the center hole and a mechanism for releasing the disk chucking by pressing of the restricting member are provided. Details of the configuration will be described in the following embodiments.
[0037]
【Example】
4 to 21 show a chucking mechanism according to the first embodiment of the present invention.
[0038]
4 to 6 show the structure of the turntable. FIG. 4 is a plan view, FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4, and FIG.
[0039]
In the turntable 16, a disk portion 17 and a cylindrical portion 18 positioned in the center thereof are integrally formed using a synthetic resin material. A concave portion 19 is formed in the disk portion 17 from the middle position to the cylindrical portion 18, and this provides a space for receiving a center ring, a chuck claw, and an urging member (coil spring) which will be described later. In addition, a turntable 16 is rotated by the rotational force of the motor by inserting a motor shaft of a spindle motor (not shown) into the center hole 18a formed in the cylindrical portion 18. .
[0040]
Three engaging grooves 20, 20, 20 are formed on the outer surface of the distal end portion of the cylindrical portion 18, that is, the end portion far from the disk portion 17. As shown in FIG. Formed at an angular interval of 120 ° around the rotation center axis of the turntable 16, a spiral groove is formed along the outer surface of the cylindrical portion 18. That is, as shown in FIG. 6, when one of the grooves is viewed from the side, one end of the groove 20 is slightly closer to the disk portion 17, and from here, obliquely along the outer surface of the cylindrical portion 18. And finally reaches the end of the cylindrical portion 18. Engagement protrusions formed on the center ring, which will be described later, are respectively engaged with these engagement grooves, and have a role of rotating the center ring as the center ring is lowered. Detailed description.
[0041]
On one surface of the disk portion 17, a rubber sheet 21 is provided at a position near the outer peripheral edge, and functions as a buffer member when the disc is placed. This is an annular rubber material having a predetermined thickness attached to the surface of the turntable. The disc is placed in contact with the rubber sheet 21 without directly touching the turntable. However, any means can be used as an alternative to the rubber sheet 21 as long as it is a means for mitigating the impact on the disk during disk chucking or preventing damage. I do not care.
[0042]
A shallow pedestal 22 is formed in the recess 19 of the turntable 16 from the bottom of the cylindrical portion 18, and a chuck claw described later is attached between the portion and the inner wall surface of the recess 19. The three attachment parts 23, 23 and 23 are provided. These mounting portions are arranged at an angular interval of 120 ° around the rotation center axis of the turntable 16, as shown in FIG.
[0043]
Since the configuration of each mounting portion 23 is the same, only one of them will be described. The mounting portion 23 includes a pair of boss portions 24 and 24 arranged in a state of being opposed to each other at a predetermined distance. The contacted portion 25 is provided between the boss portions and is in contact with one end portion (rotation fulcrum portion) of the chuck claw.
[0044]
As shown in FIG. 5, the boss portions 24 and 24 have a slightly higher height than the pedestal portion 22, and these are engagements for supporting the chuck claws described later in a rotatable state. Holes 24a and 24a are respectively formed. These engagement holes are formed as long holes whose formation direction extends in a direction parallel to the central axis of the cylindrical portion 18, and the lower end of the disk portion 17 (a flat portion on the side opposite to the recessed portion 19). ).
[0045]
Further, the abutted portion 25 is formed as a hollow curved in a cylindrical surface between the paired boss portions 24, 24, and its shape corresponds to the end shape of the chuck claw described later. is there. As shown in FIG. 4, when the three contacted portions 25, 25, 25 are viewed from the direction along the rotation center axis of the turntable 16, these are angular intervals of 120 ° around the rotation center axis. A pair of boss portions 24, 24 are disposed on both sides of each contacted portion 25 with the two interposed therebetween.
[0046]
Note that a step 26a is formed on the inner wall surface 26 of the recess 19 over the entire circumference, but this center ring abuts on the step 26a in a state where the center ring described later is received in the recess 19. It has the role of regulating further movement to the turntable side.
[0047]
7 and 8 show the shape of the center ring (corresponding to the centering member described above), FIG. 7 is a plan view, and FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.
[0048]
The center ring 27 includes a cylindrical portion 28 (corresponding to the above-described central shaft portion) forming a central portion thereof and an outer peripheral portion 29 formed so as to project outward from the periphery thereof by a synthetic resin material. It is integrally formed. The cylindrical portion 28 has a center hole 28a, and the inner peripheral surface thereof has a central axis of the center hole 28a as shown in FIGS. 7 and 8 (enlarged in a great circle). In addition, the three protrusions 30, 30, 30 are formed with an angular interval of 120 °. Note that these protrusions 30 are formed by engaging grooves 20 formed on the outer surface of the cylindrical portion of the turntable 16 when the cylindrical portion 28 of the center ring 27 is attached to the cylindrical portion 18 of the turntable 16. 20 and 20 are respectively engaged. Each protrusion has a shape such that a part of the hemisphere is cut by a plane parallel to the great circle.
[0049]
Further, three holes 31, 31, 31 having 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 as shown in FIG. 7. , Almost fan-shaped and extends to the base of the cylindrical portion 28. A cam surface 32 is formed on the inner surface of each hole 31 on the surface facing the cylindrical portion 28, and serves to regulate the tilting posture of the chuck pawl as will be described later. That is, the cam surface 32 is formed by an arc surface 32a having the smallest radius from the rotation center axis of the center ring 27, an arc surface 32c having a larger radius, and a tapered surface 32b between the arc surfaces and connecting the two. Has been. In addition, regarding the positional relationship between these holes 31, 31, 31 and the above-described protrusions 30, 30, 30, the boundary position between the arc surface 32 a and the tapered surface 32 b, and the formation position of the protrusion 30 in the cylindrical portion 28. However, the arc surface 32a, the tapered surface 32b, and the arc surface 32c are positioned in this order along the counterclockwise direction of FIG. Three people are consecutive.
[0050]
As shown in FIG. 8, the outer peripheral portion 29 is shaped to be connected to the peripheral portion 33 after being bent in a substantially L shape from a flat portion continuous from one end of the cylindrical portion 28. A slope 33a is formed on the peripheral edge 33, and the edge of the center hole 2a of the disk 2 is brought into contact with the slope. Further, a concave portion 33b is formed in the inner portion of the inclined surface 33a so that a coil spring described later is brought into contact therewith.
[0051]
9 to 12 show the shape of the center cap (corresponding to the restriction member described above). FIG. 9 is a plan view, FIG. 10 is a bottom view, FIG. 11 is a side view, and FIG. It is sectional drawing which follows a XII-XII line.
[0052]
In the center cap 34, a disc portion 35 having a substantially disc shape and three projecting portions 36, 36, 36 projecting from the disc portion 35 are integrally formed using a synthetic resin material. As shown in FIG. 9, a circular hole 37 is formed at the center of the disk portion 35, and three notches 38, 38, 38 are formed at an angular interval of 120 ° around the center of the hole. Has been. These substantially rectangular cutouts 38 correspond to the mounting portions 23 of the turntable 16 described above, respectively, and contribute to the formation of a chuck claw arrangement space to be described later.
[0053]
As shown in FIG. 10, the three protrusions 36, 36, and 36 are formed immediately around the circular hole 37, and are provided between the circular hole 37 and the notch 38 in terms of position. That is, these protrusions 36 are formed at an angular interval of 120 ° with respect to the center of the circular hole 37. As shown in FIG. 12, the protrusion 36 is formed with a protrusion 39 protruding outward (in a direction away from the center of the circular hole 37) in the middle thereof, which will be described later. A coil spring is brought into contact therewith.
[0054]
FIG. 13 shows the shape of a chuck claw (corresponding to the disk holding member described above), and shows a plan view, a side view, a bottom view, and a front view. Since all three chuck claws have the same shape, one of them will be described below.
[0055]
The chuck claw 40 is formed of a synthetic resin and has a claw portion 41 and a pair of leg portions 42 and 42.
[0056]
The claw portion 41 is provided with a protrusion 43 at the tip for contacting and holding the disk, and a protrusion 44 is formed at a position opposite to the protrusion 43.
[0057]
An inclined surface 45 is formed from the position where the protrusion 44 is formed in the claw portion 41 to a position near the leg portion 42, and continues from the inclined surface 45 through the flat surface 46 to the back surface of the leg portion 42. It has a shape. As will be described later, the slope 39 of the center cap 34 is in contact with the inclined surface 45.
[0058]
Further, a protrusion 47 having a semi-cylindrical shape is formed at a position on the opposite side to the flat surface 46 in the claw 41, and the protrusion 47 is formed on the cam surface 32 of the center ring 27 described above. It is slid in contact.
[0059]
About a pair of leg parts 42 and 42, the edge parts 48 and 48 are formed in circular shape seeing from the side, and this part comes to be attached to the above-mentioned turntable 16 (attachment part 23). Yes. For this purpose, engaging projections 49 and 49 are formed on the outer surfaces of the end portions 48 and 48, respectively, which are opposed to each other and engaged with the engaging hole 24a of the boss portion 24 described above. Is. Each engagement protrusion 49 has a shape obtained by obliquely cutting a part of a cylinder.
[0060]
FIG. 14 shows the coil springs 50 and 51 made of metal in addition to the components described above, and shows a state before the chucking mechanism 52 is assembled. As shown in the figure, when assembling, the coil springs 50 and 51 and the chuck pawl 40 are disposed in the recess 19 of the turntable 16 and the cylindrical portion 28 of the center ring 27 is extrapolated from the cylindrical portion 18 of the turntable 16. In this state, the center cap 34 is attached from above. That is, when the chuck claw 40 is attached to the attachment portion 23 of the turntable 16, the engagement protrusions 49, 49 formed on the end portion 48 of the chuck claw 40 are inserted into the engagement holes 24 a, 24 a of the attachment portion 23. By engaging with each other, the chuck claw 40 is supported by the boss portion 24 in a rotatable state. Further, with respect to the center ring 27, the protrusions 30 formed on the inner peripheral surface of the cylindrical portion 28 are engaged with the grooves 20 on the outer periphery of the cylindrical portion of the turntable 16 to turn the cylindrical portion 28 of the center ring 27. Extrapolated to the cylindrical portion 18 of the table 16. Further, the circular hole 37 of the center cap 34 is inserted from the outside, and at this time, each protrusion 36 of the center cap 34 passes through each hole 31 of the center ring 27 and enters the recess 19 of the turntable 16 (center ring). 27 and the turntable 16). The outer shapes of the coil springs 50 and 51 are both cylindrical. The coil spring 50 is disposed between the recess 33b of the center ring 27 and the turntable 16, and the coil spring 51 is center cap. It is arranged between the 34 protrusions 39 and the turntable 16.
[0061]
FIG. 15 shows a state in which the chucking mechanism 52 is assembled, the state when the disc 2 is mounted on the left half surface of the drawing with the center line CL as a reference, and the chucking of the disc 2 is completed on the right half surface. It is illustrated so that the positional relationship of each member can be easily understood by comparing the states. In addition, the hatching line about each member is intentionally omitted.
[0062]
The center cap 34 has a 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 central axis of the cylindrical portion 28. Each protrusion 39 of the center cap 34 is positioned between the center ring 27 and the turntable 16, and a biasing force by the coil spring 51 is given to them. That is, one end of the coil spring 51 is in contact with the protrusion 39 and the other end is in contact with the bottom of the recess 19 of the turntable 16, whereby the center cap 34 is moved away from the turntable 16. The urging force is acting.
[0063]
The center ring 27 received in the recess 19 of the turntable 16 is given a biasing force by the coil spring 50. That is, one end of the coil spring 50 is brought into contact with the concave portion 33b of the center ring 27 and the other end is brought into contact with the vicinity of the attachment portion 23 (near the leg portion 42) of the chuck claw 40, so On the other hand, a biasing force in a direction away from the turntable 16 is always acting.
[0064]
When the center ring 27 is inserted into the recess 19 of the turntable 16, each protrusion 30 is engaged with each engagement groove 20 of the turntable 16, but against the force of the coil spring 50. When the center ring 27 is moved downward in the figure (in the direction approaching the turntable 16), this is guided in a spiral manner by the engagement between the protrusion 30 and the engagement groove 20 (that is, the center ring 27 rotates). While descending.) Thus, in the present embodiment, the above-described form (A) is adopted.
[0065]
The chuck claw 40 is supported in a state in which it can be tilted to the mounting portion 23 by engaging an engagement protrusion 49 formed on the end portion 48 of the leg portion 42 with the engagement hole 24a of the boss portion 24 of the turntable 16. However, in the state shown in the left half surface of FIG. 15, the protrusion 47 of the chuck claw 40 comes into contact with the arc surface 32 a formed in the hole of the center ring 27, so that the chuck claw 40 is on the center cap 34 side. It is regulated to tilt. On the other hand, in the chucking state shown in the right half surface of FIG. 15, the center ring 27 rotates and the projecting portion 47 of the chuck claw 40 contacts the arc surface 32c. And the chuck claw 40 is tilted in a direction away from the center cap 34, and the disc 2 is sandwiched between the tip of the claw portion 41 and the inclined surface 33a of the center ring 27. Yes. In this state, the inclined surface 45 of the chuck claw 40 is pressed from behind by the protrusion 39 of the center cap 34 so that the chuck claw 40 is prevented from falling down.
[0066]
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. FIG. 19 to FIG. 21 are diagrams schematically showing the positional relationship of each member in cross section. 16 to 18, the center ring 27 is indicated by a solid line, the center cap 34 is indicated by a two-dot chain line, and the chuck pawl 40 is indicated by a one-dot chain line for easy understanding. The main part is shown enlarged in the great circle. Also, all hatching lines showing cross sections in FIG. 19 to FIG. 21 are omitted.
[0067]
First, FIG. 16 shows a state before the disk is mounted, and the arc surface 32a having the smallest radius among the holes 31 of the center ring 27 is outward of the chuck pawl 40 (in a direction away from the center of rotation of the center ring 27 in the radial direction). The protrusion to is regulated. That is, as shown in FIG. 19, when the protrusion 47 of the chuck claw 40 is brought into contact with the arc surface 32 a of the center ring 27, the chuck claw 40 is tilted most toward the rotation center axis side of the turntable 16. Since the chuck claw 40 is in a state, the position of the chuck claw 40 is regulated so that the tip of the claw portion 41 does not protrude outward beyond the outer peripheral edge of the disc portion of the center cap 34. This is to prevent the center hole 2a from being caught by the claw portion 41 when the disk 2 is mounted. In this state, the center ring 27 is located at the uppermost position (in the direction away from the turntable 16), and the center cap 34 is most lowered when the tips of the protrusions 36 abut against the pedestal 22 of the turntable 16. It has become a state. The reason why the center cap 34 sinks against the force of the coil spring 51 is that the protrusion 39 of the center cap 34 is in contact with the inclined surface 45 of the chuck claw 40 and is regulated in position.
[0068]
FIG. 17 shows a state in the middle of chucking after the disk 2 (not shown) is mounted, and the center ring 27 is rotated in the clockwise direction of the drawing as it is lowered. . In the figure, since the chuck claw 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 claw 40, the chuck is compared with the state of FIG. The position restriction on the nail 40 is slightly relaxed. That is, as shown in FIG. 20, when the disc is mounted, the center ring 27 is pushed toward the turntable 16 with the edge of the center hole 2a of the disc 2 in contact with the inclined surface 33a of the center ring 27. Since it sinks slightly to the 16 side, the chuck pawl 40 is slightly tilted outward (in the direction away from the center of the center cap 34) compared to the state of FIG. As the center ring 27 is lowered, the coil spring 50 is slightly contracted compared to the state shown in FIG.
[0069]
When the disk 2 is further lowered to the turntable 16 side, the center ring 27 is lowered while rotating in the clockwise direction in FIG. 17, and finally the state shown in FIGS. 18 and 21 is obtained. To reach.
[0070]
FIG. 18 shows a state in which the chucking of the disc is completed, and the center ring 27 is lowered most and its rotation is stopped. In the figure, since the cam surface 32 of the center ring 27 and the chuck claw 40 are in a relative positional relationship, the arcuate surface 32c of the hole 31 and the protrusion 47 of the chuck claw 40 come to a position facing each other. Tilt regulation with respect to the claw 40 is 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 most lowered in the recess 19 of the turntable 16, and the chuck pawl 40 is raised to the outermost side. Then, the edge portion of the center hole 2 a of the disk 2 is sandwiched between the claw portion 41 of the chuck claw 40 and the inclined surface 33 a of the center ring 27, and a part of the disk 2 is interposed via the rubber sheet 21. And placed on the turntable 16. The center cap 34 is in a state where it is most lifted by the urging force of the coil spring 51, and the protrusion 39 presses the inclined surface 45 of the chuck claw 40 to press it outward. 40 is prevented from falling inward, and the further rise of itself is suppressed (the protrusion 44 of the chuck claw 40 is a stopper for the protrusion 39 of the center cap 34). Further, the coil spring 50 is in the most contracted state and stores energy when the disk is taken out.
[0071]
The disk 2 is chucked in the above process. When the disk 2 is removed, the following operation is performed.
[0072]
That is, in FIG. 21, when the center cap 34 that has been lifted by the force of the coil spring 51 is pushed downward, the contact relationship between the protrusion 39 of the center cap 34 and the inclined surface 45 of the chuck pawl 40 is released. The chuck pawl 40 has a degree of freedom to tilt inward. As described above, the urging force in the direction away from the turntable 16 is exerted on the center ring 27 by the coil spring 50, and as a result, the center ring 27 rises while rotating in the direction to return to the original state by releasing the contact relationship (see FIG. 18) rotate in a spiral manner along 18 counterclockwise directions. As is clear from the relationship between the force point and the rotation fulcrum of the chuck pawl 40, the center ring 27 rises while rotating and the disk 2 is lifted by the center ring 27. As shown in FIGS. 16 and 19, the chuck claw 40 is finally retracted to the inside and completely separated from the disc 2, so that the claw portion 41 is not caught in the center hole 2 a of the disc 2. Therefore, there is no problem in ejecting the disk 2.
[0073]
As described above, in the chucking mechanism 52 according to the first embodiment, the engagement mechanism for the spiral movement of the center ring 27 with respect to the turntable 16 is formed on the outer peripheral surface of the cylindrical portion 18 of the turntable 16. The length of the engagement groove with respect to the rotation angle around the rotation center axis is constituted by the engagement groove 20 formed and the protrusion 30 formed on the inner peripheral surface of the cylindrical portion 28 of the center ring 27. Has the advantage of being short.
[0074]
22 to 36 show a second embodiment according to the present invention.
[0075]
22 and 23 show the structure of the turntable. FIG. 22 is a plan view, and FIG. 23 is a sectional view taken along line XXIII-XXIII in FIG.
[0076]
In the turntable 53, a disc-shaped mounting portion 54 and a cylindrical portion 55 positioned at the center thereof are integrally formed using a synthetic resin material. A concave portion 56 is formed in the mounting portion 54 from the middle position to the cylindrical portion 55, and this provides a space for receiving a center ring, a chuck claw, and an urging member (coil spring) described later. . Although not shown in the drawing, the turntable 53 is rotated by the rotational force of the motor by inserting and fitting the motor shaft of the spindle motor into the center hole 55a formed in the cylindrical portion 55. It has become.
[0077]
On one surface of the mounting portion 54, a rubber sheet 57 as a buffer member is provided at a position near the outer peripheral edge thereof. This is an annular rubber material having a predetermined thickness attached to the surface of the turntable 53, and the disc is in contact with the rubber sheet 57 without directly touching the turntable 53. Is required to mount.
[0078]
On the inner wall surface of the recess 56 of the turntable 53, as shown in FIG. 22, there are three engaging protrusions 58, 58, 58 with an angular interval of 120 ° around the rotation center axis of the turntable 53. It protrudes toward the direction (direction approaching the cylindrical part 55). These engaging protrusions are engaged with a groove formed on the side surface of the center ring, which will be described later, and have a role of rotating the center ring as the center ring is lowered. The operation will be described in detail later.
[0079]
In addition, a shallow pedestal portion 59 that is continuous from the skirt of the cylindrical portion 55 is formed in the recess 56 (see FIG. 23), and a chuck claw described later is attached between the portion and the inner wall surface. For this purpose, three attachment portions 60, 60, 60 are provided, and these are arranged at an angular interval of 120 ° around the rotation center axis of the turntable 53, as shown in FIG. As shown in FIG. 22, the positional relationship between the mounting portion 60 and the engaging protrusion 58 is between the adjacent engaging protrusions 58 and closer to the inner side. Are located respectively.
[0080]
Since each of the mounting portions 60 has the same configuration, one of them will be described. The mounting portion 60 has a chuck claw disposing hole 60a and a pair of engaging holes 60b formed on both sides thereof. , 60b are formed. In other words, the arrangement hole 60a has a shape obtained by cutting out a part of the bottom surface of the concave portion 56 (actually, it depends on molding), and continues to the pedestal portion 59 as shown in FIG. It is formed between the terminal end of the inclined surface portion 60c extending in the radial direction of the mounting portion 54 (the direction away from the cylindrical portion 55) and the wall surface of the concave portion 56 facing this. Engagement holes 60b and 60b are respectively formed on the left and right side walls 60d and 60d forming the arrangement hole 60a, and these engagement holes are provided to rotatably support a chuck claw described later. It has been.
[0081]
24 to 26 show the shape of the center ring (corresponding to the centering member described above). FIG. 24 is a plan view, FIG. 25 is a side view, and FIG. 26 is taken along the line XXVI-XXVI in FIG. It is sectional drawing.
[0082]
The center ring 61 is formed in a substantially annular shape by a synthetic resin material, but as shown in FIG. 24, three notches 62c, 62c, 62c are formed in a hole 62 formed around the rotation center. It is formed with an angular interval of °. Incidentally, a cam surface is formed on the inner surface of the hole 62 and has a role of regulating the tilting posture of the chuck pawl as will be described later. That is, most of the cam surface of the hole 62 is occupied by the three arc surfaces 62a, 62a, 62a constituting the circular hole, and these are the smallest (inner) radius portions. Tapered surfaces 62b are formed at the portions connecting from the portions 62a to the notches 62c so that the radii gradually increase and continue to the maximum (inner) radius portion (arc-shaped portion) in the notches 62c. .
[0083]
As shown in the figure, the center ring 61 includes a ring portion 63 having a substantially ring shape that forms an outer peripheral edge thereof, and a plate-like portion 64 (a portion in which the hole 62 is formed) continuous to the end portion thereof. The slope 65 is formed in the part near these outer periphery. 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 reaches a boundary portion where the ring portion 63 and the plate-like portion 64 continue on the outer side surface, and extends along an oblique direction when viewed from the side surface. Later, the other end of the groove 66 reaches the end surface of the ring portion 63 (the lower end surface far from the plate-like portion 64). As shown in FIG. 24, the positional relationship between the end of each groove 66 and the notch 62c when the center ring 61 is viewed from the plane is in the middle of the groove ends of adjacent grooves and inside thereof. Each notch 62c is arranged at a position near the center.
[0084]
As for the cross-sectional shapes of the ring part 63 and the plate-like part 64, as shown in FIG. 26, an annular recess 67 is formed inside the vicinity of the boundary between the two parts, and a coil spring described later contacts this. As a result, an urging force in a predetermined direction is applied to the center ring 61.
[0085]
Note that a portion of the ring portion 63 close to the end face away from the plate-like portion 64 is gradually reduced in thickness as it goes closer to the end, so that a slight inclined portion 68 (see FIG. 26) is formed inside. However, this is required as a relief for the coil spring described later.
[0086]
27 and 28 show the shape of the center cap (corresponding to the restriction member described above), FIG. 27 is a plan view, and FIG. 28 is a cross-sectional view taken along line XXVIII-XXVIII in FIG.
[0087]
In the center cap 69, a main portion 70 having a substantially cylindrical shape and a flange portion 71 having a disc shape are integrally formed using a synthetic resin material. As shown in FIG. 27, a circular hole 70a is formed in the central portion of the main portion 70, and three notches 72, 72, 72 are provided at the flange portion 71 with an angular interval of 120 ° around the center of the hole. Is formed. These cutout portions 72 are portions formed so as to be cut out in a rectangular shape along the radial direction of the flange portion 71, and respectively correspond to the attachment portions 60 provided on the turntable 53. It contributes to the formation of the space for arranging the chuck claws described later.
[0088]
As shown in FIG. 28, a concave portion 70b formed in an annular shape is formed inside the main portion 70, and a coil spring, which will be described later, can be received therein. In addition, an annular ridge 70c facing outward (in a direction away from the central axis of the main portion 70 in the radial direction) is formed at a position near the end opposite to the flange portion 71 in the main portion 70. Yes.
[0089]
FIG. 29 shows the shape of a chuck claw (corresponding to the disk holding member described above), and shows a plan view, a side view, a bottom view, and a front view. Since all three chuck claws have the same shape, one of them will be described below.
[0090]
The chuck claw 73 is made of a synthetic resin and has a claw portion 74 and a pair of leg portions 75 and 75.
[0091]
The claw portion 74 is provided with a projection 76 at the tip for contacting and holding the disk, and an elastic piece 77 is integrally formed at a position opposite to the projection 76. A protrusion 78 is formed on the same surface as the surface where the elastic piece 77 is formed at a position near the leg 75 in the claw 74 and protrudes in the opposite direction to the protrusion 76. A slope 79 is formed on the surface of the projection 78 that is far from the elastic piece 77.
[0092]
The pair of leg portions 75, 75 are formed in a square shape when viewed from the side, and the end portions 80, 80 are formed in a circular shape. Are attached to the mounting portion 60). For this purpose, engaging projections 81, 81 are formed on the outer surfaces of the end portions 80, 80, respectively, which are directed in opposite directions to be engaged with the engaging holes 60b, 60b of the mounting portion 60 described above. It is to be combined.
[0093]
FIG. 30 shows a state in which the chucking mechanism 84 is assembled by incorporating metal coil springs 82 and 83 in addition to the components described above, but the left half of the same figure shows the center line CL as a reference. The state before the disk is mounted and the state where chucking of the disk 2 is completed are compared with each other on the right half surface so that the positional relationship of each member can be easily understood. The hatching lines for the chuck claws 73 are intentionally omitted.
[0094]
The center cap 69 is attached in a state where the cylindrical portion 55 of the turntable 53 is inserted into a circular hole 70a formed in the center cap 69, and a coil spring 82 is disposed in the recess 70b. That is, the coil spring 82 having a cylindrical outer shape has one end in contact with the bottom of the recess 70 b and the other end in contact with the pedestal 59 of the turntable 53, and the turntable 53 with respect to the center cap 69. An urging force in a direction away from is applied.
[0095]
A coil spring 83 is disposed between the center ring 61 received in the recess 56 of the turntable 53 and the bottom surface of the recess 56, and one end of the coil spring is brought into contact with the recess 67 of the center ring 61. In addition, the other end is brought into contact with the vicinity of the attachment portion 60 (near the leg portion 75) of the chuck claw 73, so that the urging force to the center ring 61 is always acting. The outer shape of the coil spring 83 is a truncated cone, and the end of the center ring 61 that is in contact with the recess 67 has the smallest diameter, and is below (on the bottom of the recess of the turntable 53). The radius gradually increases as you go.
[0096]
When the center ring 61 is inserted into the recess 56 of the turntable 53, the engagement protrusions 58, 58, 58 formed on the inner wall surface of the recess 56 are respectively inserted into the grooves 66, 66, 66 of the center ring 61. The engagement between the engagement protrusion 58 and the groove 66 occurs when the center ring 61 is moved downward (in the direction approaching the turntable 53) against the force of the coil spring 83. It is guided in a spiral manner (that is, the center ring 61 descends while rotating). Thus, in the present embodiment, the above-described form (B) is adopted.
[0097]
The chuck claw 73 is supported in a state in which it can be tilted with respect to the attachment portion 60 by engaging the engagement protrusion 81 formed on the end portion 80 of the leg portion 75 with the engagement hole 60 b of the attachment portion 60. However, in the state shown in the left half surface of FIG. 30, the chuck claw 73 is regulated so as to be tilted toward the center line CL by the hole 62 (cam surface thereof) of the center ring 61. On the other hand, in the chucking state shown in the right half surface of FIG. 30, the center ring 61 rotates and the chuck claw 73 is in a positional relationship corresponding to the notch 62c. The disk 2 is sandwiched between the tip of the claw 74 and the inclined surface 65 of the center ring 61 with the chuck claw 73 tilted in a direction away from the center line CL. In this state, the chuck claw 73 is regulated so as not to fall inward by the protrusion 78 of the chuck claw 73 being in contact with the protrusion 70 c of the center cap 69.
[0098]
FIGS. 31 to 36 are diagrams for explaining the operation, and FIGS. 31 to 33 are diagrams 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. 34 to 36 are diagrams for schematically showing the positional relationship of each member in cross section. In FIG. 31 to FIG. 33, for ease of understanding, the center ring 61 is indicated by a solid line, the center cap 69 is indicated by a two-dot chain line, and the chuck claw is indicated by a one-dot chain line. The main part is shown enlarged in the great circle. In FIG. 34 to FIG. 36, all hatching lines showing cross sections are omitted.
[0099]
First, FIG. 31 shows a state before the disk is mounted, and the arc surface 62a, which is the smallest radius, of the hole 62 of the center ring 61 is separated outward from the chuck pawl 73 (from the rotation center of the center ring 61 in the radial direction). (Direction) is restricted. That is, as shown in FIG. 34, the lower portion of the claw portion 74 of the chuck claw 73 is brought into contact with the arc surface 62a of the hole 62 of the center ring 61 so that the chuck claw 73 is brought into the inner side (rotation center axis side). 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 center hole 2a is caught by the claw portion 74 when the disk 2 is mounted.) In this state, the center ring 61 is at the uppermost position (in the direction away from the turntable 53), and the surface of the plate-like portion 64 is in contact with the claw portion 74 of the chuck claw 73 from below in the drawing. Further, the center cap 69 is in a state where the main portion 70 is in the most lowered state by contacting the pedestal portion 59 of the turntable 53, and the elastic piece 77 of the chuck claw 73 is elastically contacted to the side surface of the main portion 70. Yes. The reason that the center cap 69 sinks against the force of the coil spring 82 is that the protrusion 70 c of the center cap 69 is in contact with the inclined surface 79 of the protrusion 78 of the chuck claw 73 and the position is regulated. is there.
[0100]
FIG. 32 shows a state in the middle of chucking after the disk (not shown) is mounted, and the center ring 61 is slightly rotated counterclockwise in the drawing as it is lowered. . In the figure, since the chuck claw 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 claw 73, the chuck is compared with the state of FIG. The position restriction on the claw 73 is slightly relaxed. That is, as shown in FIG. 35, the center ring 61 is pushed by the disk 2 and slightly sinks to the turntable 53 side (the edge of the center hole 2a of the disk 2 is in contact with the inclined surface 65 of the center ring 61. 34), the chuck pawl 73 is slightly tilted outward (in a direction away from the main portion 70 of the center cap 69) compared to the state of FIG. The restoring force gives a force to push the chuck pawl 73 outward.) As the center ring 61 is lowered, the coil spring 83 is slightly contracted compared to the state shown in FIG.
[0101]
When the disk 2 is further lowered to the turntable 53 side, the center ring 61 is lowered while rotating, and finally reaches the state shown in FIGS.
[0102]
FIG. 33 shows a state in which the chucking of the disc is completed, and the center ring 61 is in the lowest state and rotated. In the figure, since the notch 62c (the arc surface) of the hole 62 and the chuck claw 73 are in a corresponding position in the relative positional relationship between the hole 62 of the center ring 61 and the chuck claw 73, the chuck claw 73 is shown. Is not released, and the claw portion 74 of the chuck claw 73 protrudes to the outermost side. That is, as shown in FIG. 36, the center ring 61 is most lowered in the recess 56 of the turntable 53, and the chuck pawl 73 is raised to the outermost side. Then, the edge portion of the center hole 2 a of the disk 2 is sandwiched between the claw portion 74 of the chuck claw 73 and the inclined surface 65 of the center ring 61, and a part of the disk 2 contacts the rubber sheet 57. It is contacted and supported on the turntable 53. The center cap 69 is in the most lifted state due to the urging force of the coil spring 82, and the protrusion 70c abuts against the inclined surface 79 of the protrusion 78 of the chuck claw 73, thereby pressing it outward. In addition, the chuck claw 73 is prevented from falling inward, and the further increase of the chuck claw 73 is suppressed. The coil spring 83 is in the most contracted state and stores energy when the disk is taken out.
[0103]
The disk 2 is chucked in the above process. When the disk 2 is removed, the following operation is performed.
[0104]
That is, in FIG. 36, when the floating center cap 69 is pushed downward, the engagement relationship between the protrusion 70c of the center cap 69 and the inclined surface 79 of the chuck claw 73 is released, so that the chuck claw 73 is moved inward. Can tilt. As described above, since the urging force in the direction away from the turntable 53 is applied to the center ring 61 by the coil spring 83, the center ring 61 rises while rotating in the direction to return to the original by this release. Due to the relationship between the force point of the chuck claw 73 and the rotation fulcrum, the chuck claw 73 falls inward and the center ring 61 rises while rotating, so that the disk 2 is lifted. 34, since the chuck claw 73 is in the most retracted state inside and completely separated from the disk 2 as shown in FIG. 34, the claw portion 74 is caught in the center hole 2a of the disk 2 and obstructs the removal of the disk 2. There is no such thing as coming.
[0105]
As described above, in the chucking mechanism 84 according to the second embodiment, the engagement mechanism for the spiral movement of the center ring 61 with respect to the turntable 53 is included in each engagement formed in the recess 56 of the turntable 53. Since it is constituted by the mating protrusion 58 and the grooves 66 formed on the outer peripheral surface of the center ring 61, it is advantageous in that the center ring 61 can be moved stably and smoothly. In this embodiment, an appropriate design means may be taken, such as reducing the frictional resistance by forming a protrusion or a protrusion on the portion of the chuck claw 73 that contacts the cam surface of the center ring 61. Of course.
[0106]
Thus, according to each embodiment described above, the following advantages can be obtained.
[0107]
-The disc can be chucked without applying excessive force when the disc is loaded.
[0108]
Since the protrusion of the chuck claw does not slide with respect to the inner peripheral surface of the disc center hole when the disc is mounted, for example, a disc of the type created by bonding two disc substrates (digital video disc) Etc.), the protrusion of the chuck claw will not be caught at the bonding boundary, and the disk or chuck claw will not be damaged.
[0109]
・ When the disc is loaded, the edge of the disc center hole is in contact with the inclined surface of the center ring, and the disc is centered, so that information can be recorded and reproduced with the disc greatly decentered with respect to the rotation axis of the turntable. In addition to eliminating the inconvenience of being performed, accurate disk centering is suitable for power saving because it reduces the applied voltage required for tracking control.
[0110]
-After the disc chucking is completed, the center cap at the center is lifted, so that when the disc is manually removed, the user can easily recognize the position to be pushed.
[0111]
・ Since the number of parts is the same as before, there is no significant cost increase, and the workability during assembly is simple because it is only necessary to assemble each part in turn on the turntable. .
[0112]
【The invention's effect】
  As is clear from the above description, claims 1 and4According to the invention, the holding of the disk by the disk holding member and the centering member is released by releasing the restriction on the movement of the disk holding member by moving the restriction member, so that the disk can be taken out without difficulty. In addition, when the disc is mounted, the centering member is pressed against the disc and moved in a direction along the rotation axis of the turntable, so that an excessive force is not applied when the disc is mounted, thereby preventing damage and the like. it can. The provision of the centering member, the disk holding member, and the regulating member does not cause a significant increase in the number of parts and the number of assembly work steps, which is advantageous in terms of cost.Furthermore, the movement restriction on the disk holding member is released by moving the restriction member, and thereby the disk holding can be released and the disk can be easily taken out from the chucking mechanism, so that the disk is not damaged. .
[0113]
  Claim 2And claim 5According to this invention, the mechanism for moving the centering member around the rotation axis of the turntable in the direction along the rotation axis can be simplified.
[0114]
  Claim 3And claim 6According to the invention, the groove or the protrusion of the centering member is formed on the outer peripheral surface of the centering member or the inner peripheral surface of the central shaft portion, thereby providing a mechanism for rotating and moving the centering member relative to the turntable. It is not necessary to secure a large space for arrangement, and the mechanism does not hinder the movement of the disk holding member.
[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 the basic configuration of the disc chucking mechanism according to the present invention together with FIG. 3, and this diagram is a plan view.
FIG. 3 is a cross-sectional view showing a state in which a disc is loaded 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 this figure is a plan view. .
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a side view.
FIG. 7 shows the center ring together with FIG. 8, and this figure is a plan view.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
FIG. 9 shows the shape of the center cap together with FIGS. 10 to 12, and this figure is a plan view.
FIG. 10 is a bottom view.
FIG. 11 is a side view.
12 is a cross-sectional view taken along line XII-XII in FIG.
FIG. 13 is a diagram showing the shape of a chuck claw.
FIG. 14 is a view showing a chucking mechanism before assembly.
FIG. 15 is a diagram showing a state when a disc is mounted on the left half surface, and a state where disc chucking is completed on the right half surface.
FIG. 16 is a view 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 claw together with FIGS. 17 and 18, and this figure shows a state before the disk is mounted.
FIG. 17 is a diagram showing a state in the middle of loading a disc.
FIG. 18 is a diagram showing a state where disc chucking is completed.
FIG. 19 is a sectional view showing the positional relationship of each member together with FIG. 20 and FIG. 21, and this figure is a diagram showing a state before mounting a disc.
FIG. 20 is a diagram showing a state in the middle of loading a disc.
FIG. 21 is a diagram showing a state where disc chucking is completed.
FIG. 22 shows a second embodiment according to the present invention together with FIGS. 23 to 36, and FIG. 22 and FIG. 23 are views showing the shape of a turntable, and this figure is a plan view. .
23 is a sectional view taken along line XXIII-XXIII in FIG.
FIG. 24 shows the center ring together with FIGS. 25 and 26, and is a plan view.
FIG. 25 is a side view.
26 is a cross-sectional view taken along line XXVI-XXVI in FIG.
FIG. 27 shows the shape of the center cap together with FIG. 28, and is a plan view.
28 is a sectional view taken along line XXVIII-XXVIII in FIG.
FIG. 29 is a diagram showing the shape of a chuck claw.
FIG. 30 is a diagram showing a state when a disc is mounted on the left half surface, and a state where disc chucking is completed on the right half surface.
FIG. 31 is a view 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 claw together with FIGS. 32 and 33, and this figure shows a state before the disk is mounted.
FIG. 32 is a diagram showing a state in the middle of disc loading.
FIG. 33 is a diagram showing a state where disc chucking is completed.
FIG. 34 is a sectional view showing the positional relationship of each member together with FIGS. 35 and 36. FIG. 34 is a diagram showing a state before the disc is mounted.
FIG. 35 is a diagram showing a state in the middle of disc loading.
FIG. 36 is a diagram showing a state where disc chucking is completed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Recording / reproducing apparatus, 2 ... Disc, 2a ... Center hole, 3 ... Disc chucking mechanism, 6 ... Turntable, 7 ... Centering member, 8 ... Disc holding member, 9 ... Restricting member, 20, 66 ... Groove, 30 58 ... Projection

Claims (6)

In the disc chucking mechanism with a turntable on which the disc is placed,
It is provided for centering the disc, and is supported by the turntable in a state in which it can be moved in the direction along the rotation axis of the turntable when pressed by the disc when the disc is loaded, and is urged away from the turntable. Centering member
Supported by the turntable in a movable state 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 disc holding member that holds the disc between the centering member by moving the centering member to the second position after the position restriction is released along with the movement of the centering member;
A support member that is supported so as to be movable in a direction along the rotation axis of the turntable, and that restricts movement of the disc holding member when chucking is completed ,
A disc chucking mechanism characterized in that movement of the disc holding member is released by moving the regulating member, and disc holding by the centering member and the disc holding member is released . The disk chucking mechanism according to claim 1,
The centering member is formed with grooves or protrusions, and the turntable is formed with protrusions or grooves that engage with the centering member, so that the centering member is pressed around the rotation axis of the turntable when the disk is loaded. A disk chucking mechanism characterized by moving in a direction along the rotation axis while rotating. In the disk chucking mechanism according to claim 2,
The disk chucking mechanism, wherein the groove or protrusion of the centering member is formed on the outer peripheral surface of the centering member or the inner peripheral surface of the central shaft portion. In a recording / reproducing apparatus using a disk chucking mechanism having a turntable on which a disk is placed,
The disk chucking mechanism is
It is provided for centering the disc, and is supported by the turntable in a state in which it can be moved in the direction along the rotation axis of the turntable when pressed by the disc when the disc is loaded, and is urged away from the turntable. Centering member
Supported by the turntable in a movable state 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 disc holding member that holds the disc between the centering member by moving the centering member to the second position after the position restriction is released along with the movement of the centering member;
A support member that is supported so as to be movable in a direction along the rotation axis of the turntable, and that restricts movement of the disc holding member when chucking is completed,
By using the disc chucking mechanism, the movement restriction on the disc holding member is released by moving the regulating member, and the holding of the disc by the centering member and the disc holding member is released. Recording / playback device. In the recording / reproducing apparatus using the disc chucking mechanism according to claim 4,
The centering member is formed with grooves or protrusions, and the turntable is formed with protrusions or grooves that engage with the centering member, so that the centering member is pressed around the rotation axis of the turntable when the disk is loaded. A recording / reproducing apparatus using a disk chucking mechanism that moves in a direction along the rotation axis while rotating. In the recording / reproducing apparatus using the disc chucking mechanism according to claim 5,
A recording / reproducing apparatus using a disk chucking mechanism, wherein a groove or a protrusion of the centering member is formed on the outer peripheral surface of the centering member or the inner peripheral surface of the central shaft portion.

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