JP2010097668A - Disk chucking mechanism and disk rotating motor with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive chucking mechanism which maintains high performance with small space, and which meets the current sever need of miniaturization, low height, high performance and low cost, while importance of a self-chucking mechanism which can hold a disk by a single motor is increased in a disk rotating motor. <P>SOLUTION: The mechanism is constituted in such a manner that energizing force of a twisted coil spring 8 is always directed radially outward by locking one side of arm part 8b of the twisted coil spring 8 comprising a coil part 8, two arm parts 8b, 8c extended from both ends of this coil part 8a to a guide part 22 formed at the back center of a clamp claw 6, energizing the clamp claw 6 radially outward, thereby forming a locking part 20 of the arm part 8b into a curve shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention mainly relates to a disk drive device for recording music and video information on optical media such as CDs and DVDs and reproducing the recorded information, and more particularly to a disk chucking mechanism for centering and holding a disk. It is.

  In recent years, disk drive devices that record music and video information on optical media such as CDs and DVDs and play back the recorded information have been required to be small, thin, high in performance, and low in cost. Along with this, the disk rotation motor that supports and rotates the optical media can also hold the disk by itself so as to meet the above requirements, and the disk drive device does not require a disk clamp mechanism separately from the motor. The importance of the chucking mechanism is increasing.

The most mainstream of the above self-chucking mechanism is the substantially cylindrical disk holding ring that holds the inner diameter part of the disk, the disk clamp pawl accommodated therein, and the disk clamp pawl radially outward. This is a disk chucking mechanism having a biasing spring, and a chucking mechanism in which a coil spring is employed as a biasing means. (For example, see Patent Document 1)
4 to 6 show a disk rotating motor and a disk chucking mechanism according to the prior art disclosed in Patent Document 1.

  4 is a cross-sectional view of a conventional disk rotation motor disclosed in Patent Document 1, FIG. 5 is a bottom plan view of the disk chucking mechanism, and FIGS. 6A to 6D are views. A disk insertion process diagram is shown.

  As shown in FIGS. 4 and 5, the substantially cylindrical disk holding ring 103 that holds the inner diameter portion 102 of the disk 101, the disk clamp pawl 104 accommodated therein, and the disk clamp pawl 104 outward in the radial direction. A disc chucking mechanism having a coil spring 105 for biasing is fastened to the center of a turntable portion 107 to which a rubber sheet 106 serving as a disc mounting surface is attached, and radially outwards by the rubber sheet 106 and the coil spring 105. The disc 101 is pinched by the biased disc clamp pawl 104, thereby enabling stable holding.

  Then, as shown in FIGS. 6A to 6D, the disk clamping claw 104 is pivoted downward in the axial direction to reduce the repulsive force at the time of inserting the disk. An excellent disc chucking mechanism that can secure a large disc holding force is realized.

In addition to the conventional technology described above, as a self-chucking mechanism that makes it easy to mount and remove the disc on the table, it is supported on the turntable so as to be rotatable in a plane perpendicular to the drive shaft. A holding member urged by a urging member on the outer side in the direction, a driving body provided rotatably with respect to the drive shaft, and a braking means for applying a braking force to the driving body; If the turntable is rotated in either direction while applying the force, the disc can be held by the turntable and the holding member, and if the turntable is rotated in the opposite direction, the disc chuck that can release the holding of the disc by the holding member. A king mechanism has also been proposed. (For example, see Patent Document 2)
FIG. 7 shows a configuration diagram of a conventional disk drive device disclosed in Patent Document 2, and FIG. 8 shows a plan view of a disk chucking mechanism.

  As shown in FIGS. 7 and 8, when a control force is applied to the driving body 109 having the switching pin 108 to rotate the rotary table 110 in the α1 direction, the switching pin 108 is relatively moved in the long hole 111 in the α2 direction. , The holding member 112 urged outward by the urging member 118 made of a torsion coil spring can enter the opening 114 of the projection 113, and the disc can be placed on the rotary table 110. The disc can be detached from the rotary table 110. Further, when a braking force is applied to the driving body from the state where the disk is placed on the rotary table 110 and the rotary table 110 is rotated in the α2 direction, the switching pin 108 moves relatively in the α1 direction in the long hole 111. Then, the holding member 112 rotates in the β1 direction, and the disk is held between the holding member 112 and the rotary table 110.

In addition to the above conventional technology, as a self-chucking mechanism that allows the disk to be attached and detached without applying a load to the drive main body or disk, a chucking mechanism that controls the moving direction of the clamp pawl using the difference in inertia force Has been proposed. (For example, see Patent Document 3)
FIG. 9 is a block diagram of a conventional disk drive device disclosed in Patent Document 3, and FIG. 10 is a plan view of a disk chucking mechanism.

As shown in FIG. 10, the pressing claw 117 is urged in a direction to be pulled into the center of the turntable by a pressing claw spring 119 formed of a torsion coil spring. Then, the torque of the disk rotation motor is transmitted from the shaft 115 to the center cam 116, and the pressing surface 120 of the center cam 116 and the clamp pawl 117 are brought into surface contact using the difference in inertia force between the center cam 116 and the turntable. As a result, the clamp claw 117 is moved in the disk fixing direction, a torque in the opposite direction is applied to the center cam 116 when releasing the disk fixation, and the clamp claw 117 is returned to the initial state by utilizing the difference in inertia force. Put on and take off.
JP 2003-59144 A (page 6-7, FIGS. 1 and 3) Japanese Patent Laid-Open No. 2002-184067 (Page 7, FIGS. 2 and 3) Japanese Patent Laid-Open No. 10-64147 (page 4, FIGS. 1 to 3)

  However, in the configuration disclosed in Patent Document 1 shown in FIGS. 4, 5, and 6, higher chucking performance, that is, a difference in disk holding force due to disk thickness is small, and a disk insertion force is small. In order to ensure a large holding force, it is necessary to increase the number of turns of the coil spring and to make the free length as long as possible. In this case, a relatively wide space is required at the center of the chucking mechanism in order to secure the stroke of the coil spring in order to maintain the function of the coil spring even if it is at the minimum compression length. For this reason, when the thickness of the disk rotation motor is reduced and the motor bearing is disposed at the center of the chucking mechanism, the accommodation space for the coil spring cannot be secured and high chucking performance cannot be maintained. The disc clamp claw is required to be stable in behavior, but in the case of a coil spring, since a part of the disc clamp claw is slidably accommodated inside the coil spring through a clearance, the bias by the coil spring is There is a problem that the direction is difficult to stabilize. In addition, it is difficult to precisely control the behavior of the clamp pawls, resulting in insufficient rotation of the clamp pawls. The problem is that the efficiency of the component force of the coil spring for returning from the rotated state is also reduced, and the tip of the clamp claw is stuck in the bonding surface of the two-layer DVD and cannot be clamped correctly, which may cause a so-called mischuck state. Can be mentioned.

Further, in the configuration disclosed in Patent Document 2 shown in FIGS. 7 and 8, since the repulsive force of the urging member does not occur when the disc is inserted, very high performance chucking can be expected. In addition to being disadvantageous in terms of cost, in addition to requiring space in the axial direction, adoption is difficult in terms of thinning.

  In addition, in the configuration disclosed in Patent Document 3 shown in FIGS. 9 and 10, the motor rotation control is complicated because the motor torque is used, and the motor turntable and the shaft are not fixed. Since it is necessary, it is difficult to secure the fastening strength and fastening position accuracy of the turntable, and there is a problem of requiring space in the axial direction.

  In order to solve the above problems, the present invention provides a substantially cylindrical disk holding ring for holding an inner diameter portion of a disk, a disk clamp pawl accommodated therein, and an urging force for urging the disk clamp pawl radially outward. In the disk chucking mechanism including the biasing means, the biasing means is a torsion coil spring including a coil portion and two arm portions extending from both ends of the coil portion, and one of the arm portions is a disc. The disc chucking mechanism is characterized in that it is engaged and biased in the vicinity of the central portion on the radial rear side of the clamp claw.

  Then, the vicinity of the locking portion of the arm portion of the torsion coil spring is formed in a curved shape protruding outward in the radial direction, and the diameter of the disk clamp claw at the position where the arm portion of the torsion coil spring and the disk clamp claw are locked The displacement from the central axis in the direction is minimized.

  Further, the disk clamp claw is configured to be rotatable in the vertical direction in the axial direction with the arm portion of the torsion coil spring as a fulcrum.

  Further, the tip of the arm portion on the side that urges the disk clamp pawl of the torsion coil spring radially outward is bent downward after the axial direction, and then folded back to the first locking position located on the axial upper side of the arm portion. And a second locking part formed at a distance from the first locking part to the lower side in the axial direction.

  And it is a disk rotation motor provided with one of said disk chucking mechanisms.

  According to the present invention, the accommodating space of the urging means for urging the disk clamp claw radially outward is possible in a smaller range compared to the conventional coil spring, and the disk rotation motor can be made thinner. Thus, even when the space at the center of the disk chucking mechanism cannot be secured, high chucking performance can be maintained.

  Then, the vicinity of the locking portion of the arm portion of the torsion coil spring is formed in a curved shape protruding outward in the radial direction, and the diameter of the disk clamp claw at the position where the arm portion of the torsion coil spring and the disk clamp claw are locked By configuring so that the displacement from the central axis in the direction is minimized, the urging force of the torsion coil spring is always directed in a constant direction radially outward, and the behavior of the clamp pawl can be stabilized.

  In addition, by using the locking portion of the torsion coil spring as a fulcrum for the rotation of the clamp claw, the rotation of the clamp claw is stabilized, and the repulsive force that occurs when the rotation of the clamp claw is insufficient when inserting the disk. Suppression is possible.

Further, by providing two locking portions of the arm portion of the torsion coil spring in parallel with a distance in the axial direction, the locking portions at the time of inserting and removing the disc are separated from each other in the axial direction. The spring can be formed, and the direction of the urging force acting on the clamp pawl when the disk is inserted and when the disk is removed can be optimized. That is, when the disc is removed, a spring force acts on the clamp claw radially outward in a plane parallel to the shaft, and when the disc is inserted, the return force from the bowing state of the clamp claw tip by turning the clamp claw is increased. It becomes possible to apply a spring force in a direction that increases the moment in the axially upward direction. Thereby, a mischuck state can be prevented.

  In addition, the chucking mechanism employing the conventional coil spring does not change the number of parts and assembly workability, and can be configured at low cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view of a disk rotating motor according to an embodiment of the present invention.

  In FIG. 1, a disk rotating motor includes a substantially cup-shaped rotor frame 1, a shaft 2 fixed to the rotor frame 1, a ring-shaped rotor magnet 3 fixed to the inner peripheral side of the rotor frame 1, a rotor A rubber sheet 5 affixed to the turntable surface 4 of the frame 1, a clamp claw 6 for holding and fixing the disk in the axial direction with the rubber sheet, and accommodating the clamp claw 6, and centering the inner diameter portion of the disk A rotor assembly 9 provided with a substantially cylindrical disk holding ring 7 for performing the above and a torsion coil spring 8 for applying a radially outward bias to the clamp pawl 6, and the shaft 2 can be rotated. A bearing 10 to be supported, a cylindrical bearing housing 11 that holds the bearing 10 on its inner peripheral side, and the rotor magnet 3 are arranged opposite to the rotor magnet 3. A stator core 17 comprising a stator core 14 wound via an edge member 13, a core holder 15 for fixing the stator core 14, and a bracket 16 having a recess for housing the bearing housing 11. It is constituted by.

  2A is a sectional view of the chucking mechanism portion according to the embodiment of the present invention, FIG. 2B is a perspective view of a torsion coil spring, and FIG. 2C is a lower perspective view of the main portion of the chucking mechanism portion. (D)-(f) is sectional drawing for operation | movement description of the torsion coil spring of the chucking mechanism part which concerns on embodiment of this invention. 3A to 3D are cross-sectional views for explaining the disk insertion process of the chucking mechanism according to the embodiment of the present invention, and FIGS. 3E to F are cross-sectional views for explaining the disk removal process. is there.

  As shown in FIGS. 2 (a) and 2 (c), the disc holding ring 7 houses a plurality of clamp claws 6 and a torsion coil spring 8 for applying a biasing force to the clamp claws 6 in the radially outward direction. The inner diameter portion is fastened to the center portion of the rotor frame 1 by a method such as adhesion or press fitting. The disc holding surface 18 at the distal end in the radial direction of the clamp claw 6 is formed with an inclination inward in the radial direction from the upper side in the axial direction to the lower side in order to generate a downward component force in the axial direction from the biasing force of the torsion coil spring 8. Due to the component force, the disk 19 is sandwiched between the rubber sheet 5 attached to the turntable surface 4 of the rotor frame 1 and the disk is stably held. A guide portion 22 is formed in the vicinity of the axial center of the rear surface in the radial direction of the clamp claw 6, and a protrusion 21 is formed in the vicinity of the upper end surface in the axial direction, and the torsion coil spring 8 is engaged with the guide portion 22 and the protrusion 21. The movement in the axial direction is restricted. The vicinity of the guide portion 22 of the clamp claw 6 serves as an application point of the urging force of the torsion coil spring 8.

Here, as shown in FIG. 2B, the torsion coil spring 8 includes a coil portion 8a and arm portions 8b and 8c extending from both ends of the coil portion 8a, respectively. And the latching | locking part 20 of the arm part 8b latched to the guide part 22 and the protrusion 21 of the clamp nail | claw 6 is formed in the curved shape which protrudes toward a radial direction outer side. As shown in FIGS. 2D to 2F, this curved shape is obtained when the disc is not mounted, that is, from the state in which the clamp pawl 6 shown in FIG. When the disc is inserted, that is, until the clamp claw 6 shown in FIG. 2 (f) is housed deepest in the radially inner peripheral side, the locking portion 20 by the biasing force toward the radially outer side of the torsion coil spring 8 The curvature and the length in the circumferential direction are set such that the displacement amount from the central axis C in the radial direction of the clamp claw 6 at the position (action point) P where the clamp claw 6 is locked is minimized. Further, the other arm portion 8 c of the torsion coil spring 8 is locked to the central portion of the rotor frame 1. Thereby, the urging force of the torsion coil spring 8 is always directed in a constant direction radially outward, and the behavior of the clamp pawl 6 can be stabilized.

  With this configuration, as shown in FIGS. 3A to 3D, when the clamp claw 6 rotates downward in the axial direction when the disk is inserted, the clamp claw 6 rotates about the locking portion 20 of the torsion coil spring 8 as a fulcrum. .

  Further, as shown in FIG. 2B, the tip of the arm portion 8b of the torsion coil spring 8 is bent in the axially downward direction and folded back to form a U-shape, and the locking portion 20 is axially The upper locking part 24 and the axially lower locking part 23 formed at a distance from the axially upper locking part 24 are provided. With this configuration, when the disk is inserted, first, as shown in FIG. 3A, the locking portion 24 on the upper side in the axial direction of the locking portion 20 of the torsion coil spring 8 is connected to the wall portion on the back surface of the clamp claw 6. It waits in the state which latched to the guide part 22 and biased the upper side of the guide part 22 to the R direction. At this time, the locking portion 23 on the lower side in the axial direction of the locking portion 20 is not locked to the clamp claw 6. Next, as shown in FIG. 3B, when the disc is inserted in the direction of arrow A, the clamp pawl 6 rotates in the axial lower B direction with the locking portion 24 on the axial upper side as a fulcrum, and moves downward in the axial direction. The side locking portion 23 is locked to the rear wall portion of the clamp claw 6 and the guide portion 22 and urges the lower side of the guide portion 22 in the R direction. Further, as shown in FIG. 3C, when the disk is inserted deeply in the direction of arrow A, the urging force of the locking portion 23 on the lower side in the axial direction of the torsion coil spring 8 is strengthened, and the clamping claw 6 is engaged on the upper side in the axial direction. Using the stop 24 as a fulcrum, it starts to rotate in the axial upper direction C, contrary to the above. When the disc is mounted on the rubber sheet 5 attached to the turntable surface 4 of the rotor frame 1 shown in FIG. 2A, the shaft of the locking portion 20 is placed as shown in FIG. The locking portion 24 on the upper side in the direction is locked to the wall portion on the back surface of the clamp claw 6 and the guide portion 22, and the upper side of the guide portion 22 is biased in the R direction. Due to this urging force, the disc is sandwiched and held between the rubber sheet 5 by a downward component force in the axial direction generated at the inclined portion of the disc holding surface 18 at the distal end in the radial direction of the clamp claw 6. At this time, the locking portion 23 on the lower side in the axial direction of the locking portion 20 is not locked to the clamp claw 6.

  That is, as shown in FIGS. 3 (b) to 3 (c), the clamp claw 6 is rotated around the axially upper locking portion 24 of the torsion coil spring 8 as a fulcrum, and is moved in the direction to return from the bowed state. -Mental force is generated. As a result, even when the tip of the clamp claw 6 enters the bonding surface of the two-layer DVD, it is possible to increase the return force from that state. Also, when the disk is removed, from the state shown in FIG. 3D, when an external force is applied in the disk removal direction (arrow D) as shown in FIG. It is pushed inward in the radial direction E direction. At this time, the locking portion 24 on the upper side in the axial direction of the locking portion 20 of the torsion coil spring 8 is locked to the wall portion on the back surface of the clamp claw 6 and the guide portion 22, and in a horizontal plane with the upper side of the guide portion 22 as the axis. To urge radially outward R. Since the locking portion 24 on the upper side in the axial direction is also pushed in the radial inner direction E in a plane horizontal to the shaft, the spring pressure of the torsion coil spring 8 is increased. The axial downward component force generated by the inclined portion of the disk holding surface 18 at the radially outer end of the clamp claw 6 is also strengthened, and the moment generated in the direction of pressing the disk downward in the axial direction is increased. As a result, the force for holding the disk by sandwiching the disk 19 with the rubber sheet 5 attached to the turntable surface 4 of the rotor frame 1 shown in FIG.

  That is, it is possible to configure the urging force and the rotation fulcrum that are required when the disc is inserted and when the disc is removed, with one torsion coil spring.

  Compact, thin, high performance, low cost, optical discs such as CDs and DVDs that record and play back music and video information, PC disk drives and AV equipment, and car navigation and car information -Useful for disk drive devices represented by audio and the like.

Sectional drawing of the disk rotation motor which concerns on embodiment of this invention (A) A sectional view of a chucking mechanism according to an embodiment of the present invention, (b) a perspective view of a torsion coil spring of the chucking mechanism according to an embodiment of the present invention, (c) an embodiment of the present invention. The lower perspective view of the principal part of the chucking mechanism part which concerns on this, (d)-(f) Sectional drawing for operation | movement description of the torsion coil spring of the chucking mechanism part which concerns on embodiment of this invention (A)-(d) Cross-sectional view for explaining the disk insertion process of the chucking mechanism according to the embodiment of the present invention, (e), (f) Explanation of the disk removal process of the chucking mechanism according to the embodiment of the present invention. Cross section for Cross-sectional view of a conventional disk rotation motor Lower plan view of a conventional disk chucking mechanism (A)-(d) Sectional drawing for demonstrating the disc insertion process of the disc chucking mechanism by a prior art. Configuration diagram of a conventional disk drive device Plan view of a conventional disk chucking mechanism Configuration diagram of a conventional disk drive device Plan view of a conventional disk chucking mechanism

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor frame 2,115 Shaft 3 Rotor magnet 4 Turntable surface 5,106 Rubber sheet 6,104,117 Clamp claw 7,103 Disc holding ring 8 Torsion coil spring 8a Coil part 8b, 8c Arm part 9 Rotor assembly Solid 10 Bearing 11 Bearing housing 12 Winding 13 Insulating member 14 Stator core 15 Core holder
16 Bracket 17 Stator assembly 18 Disc holding surface 19, 101 Disc 20 Locking portion 21 Projecting portion 22 Guide portion 23 Locking portion on the lower side in the axial direction 24 Locking portion on the upper side in the axial direction 101 Disc 102 Inner diameter portion 105 Coil spring DESCRIPTION OF SYMBOLS 107 Turntable part 108 Switching pin 109 Driving body 110 Rotary table 111 Elongated hole 112 Holding member 113 Projection part 114 Opening part 116 Center cam 118 Energizing member 119 Pressing claw spring 120 Pressing surface α1, α2 Rotating direction of rotary table β1 Holding member Rotation direction A Disc insertion direction B, C, E, R Clamp claw rotation direction D Disc removal direction P Action point S Center axis

Claims (5)

In a disk chucking mechanism comprising a substantially cylindrical disk holding ring for holding an inner diameter part of a disk, a disk clamp claw accommodated in the disk holding ring, and a biasing means for biasing the disk clamp claw radially outward The biasing means is a torsion coil spring comprising a coil portion and two arm portions extending from both ends of the coil portion, and one of the arm portions is near the central portion on the radial rear side of the disc clamp claw. A disk chucking mechanism characterized in that the disk chucking mechanism is engaged with and energized. The vicinity of the locking portion of the arm portion of the torsion coil spring is formed in a curved shape projecting outward in the radial direction, and the radial direction of the disk clamp claw at the position where the arm portion of the torsion coil spring and the disk clamp claw are locked 2. The disk chucking mechanism according to claim 1, wherein a displacement from the central axis is minimized. 2. The disk chucking mechanism according to claim 1, wherein the disk clamp claw is configured to be pivotable in the vertical direction in the axial direction with the arm portion of the torsion coil spring as a fulcrum. A first locking portion located on the upper side in the axial direction of the arm portion by folding the tip end of the arm portion on the side that urges the disk clamp pawl of the torsion coil spring radially outward; 2. The disc chucking mechanism according to claim 1, wherein a second locking portion is formed at a distance from the first locking portion in the axially lower side. A disk rotation motor comprising the disk chucking mechanism according to any one of claims 1 to 4.

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