JP2009193615A - Optical disk apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk apparatus which reduces a biasing force of a spring which energizes a lever to move back to a rotation starting point so as to prevent a disk abutting portion provided at a tip of the lever from continuing to apply a large load to a disk, even when the rotation angle of the lever is large. <P>SOLUTION: The optical disk apparatus includes a rotation table 31a which holds the disk in a manner which allows the disk to freely rotate, the lever 301 which is rotated around a predetermined pivot, and abuts a periphery of the disk and guides the disk onto the rotation table 31a, a motor 60 which drives the lever 301, a spring 502 which applies a force which moves the lever 301 back to a predetermined standby position, and a cam 501 which is provided between the lever 301 and the spring 502, and transfers the biasing force of the spring 502 to the lever 301. The cam 501 attenuates the biasing force of the spring 502 which is transferred to the lever 301 as the rotation angle of the lever 301 goes further away from the standby position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus that performs recording or reproduction on a disc-shaped recording medium such as a CD or DVD, and more particularly to a so-called slot-in type optical disc apparatus that can directly insert or eject a disc from the outside. is there.

  There is a slot-in type optical disc apparatus that guides a disc by bringing a plurality of levers into contact with the end face of the disc. This slot-in type optical disk apparatus includes a disk that can currently handle a diameter of 12 cm and a disk that can handle both a diameter of 8 cm and 12 cm. An optical disc apparatus capable of handling both 8 cm and 12 cm diameter discs has a pull-in lever that can be pulled in by sharing both 8 cm and 12 cm, and this pull-in lever can be used for both 8 cm discs and 12 cm discs. It has become.

  When using an 8 cm disc, the pull-in lever has a role of guiding the 8 cm disc and needs to move to a retracted position so as not to prevent the disc from rotating when the 8 cm disc rotates. On the other hand, when using a 12 cm disc, the pull-in lever has a role of guiding the 12 cm disc and needs to move to a retracted position so as not to prevent the disc from rotating when the 12 cm disc rotates. Therefore, it is necessary to rotate the pull-in lever over a wide range from a standby position waiting for the insertion of the 8 cm disk to a standby position when rotating the 12 cm disk.

  At this time, the rotation start point of the pull-in lever is a standby position waiting for the insertion of an 8 cm disc, and the rotation end point of the pull-in lever is a standby position when the 12 cm disc is rotated. When no disc is inserted in the optical disc device, the pull-in lever must always be maintained at the rotation start position, so a spring is connected to the end of the pull-in lever, and the pull-in arm is always rotated by the biasing force of the spring. The starting point is maintained.

  FIG. 13 is a diagram showing the relationship between the amount of extension of the conventional spring and the load applied to the disk contact portion of the pull-in lever. The horizontal axis represents the amount of spring extension, and the vertical axis represents the load applied to the disk contact portion of the pull-in lever. Show. In FIG. 13, point P1 ′ indicates the load applied to the disk contact portion of the pull-in lever when the spring extension amount is G5, and point P2 ′ indicates the disk contact portion of the pull-in lever when the spring extension amount is G7. The point P3 ′ indicates the load applied to the disk contact portion of the pull-in lever when the spring extension amount is G9, and the point P4 ′ indicates the disk contact of the pull-in lever when the spring extension amount is G11. The load applied to the contact portion is shown.

In the conventional case shown in FIG. 13, the load applied to the disk contact portion of the pull-in lever increases as the amount of extension of the spring increases.
JP 2003-045110 A

  However, since the pulling lever that can accommodate both 8 cm and 12 cm has a large amount of rotation, when the pulling lever reaches the rotation end point while pulling the 12 cm disk, the disk contact portion provided at the tip of the pulling lever is There was a problem of loading a disk while continuously applying a large load to the disk.

  Also, when the pulling lever is rotated by a motor against the biasing force from the spring in order to take the disk into the chassis, power corresponding to the biasing force is required, and the greater the biasing force, the more power is consumed. There was a problem.

  The present invention was made to solve the above problems, and even when the amount of rotation of the lever increases, the urging force from the urging means that attempts to return the lever to the rotation start point is reduced, Provided is an optical disc apparatus in which a disc contact portion provided at the tip of a lever does not continuously apply a large load to the disc, and further, the power required for rotating the lever by a motor when taking the disc into the chassis can be reduced. For the purpose.

  The present invention relates to a rotary table that rotatably holds a disk, a lever that rotates around a predetermined rotation fulcrum, abuts around the disk and guides the disk on the rotary table, and a motor that drives the lever And an urging means for urging the force for returning the lever to a predetermined standby position, and a cam provided between the lever and the urging means and transmitting the urging force of the urging means to the lever, The cam is characterized in that the urging force of the urging means transmitted to the lever is attenuated as the turning angle of the lever moves away from the standby position.

  According to the present invention, the cam provided between the lever and the urging means and transmitting the urging force of the urging means to the lever is transmitted to the lever so that the rotation angle of the lever is away from the standby position. By attenuating the urging force of the urging means, the urging force transmitted from the urging means to the lever is attenuated according to the rotation angle of the lever, so that the rotation angle of the lever increases and the force received from the urging means is reduced. Even when it is increased, the urging force transmitted from the urging means to the lever can be reduced. As a result, since the urging force transmitted from the urging means to the lever is reduced, the urging force from the urging means that attempts to return the lever to the starting point of rotation even when the amount of rotation of the lever increases. As a result, the disk contact portion provided at the tip of the lever does not continue to apply a large load to the disk. Further, the biasing force of the biasing means that is provided between the lever and the biasing means and that transmits the biasing force of the biasing means to the lever is transmitted to the lever so that the rotation angle of the lever is away from the standby position. Since the urging force transmitted from the urging means to the lever is attenuated according to the rotation angle of the lever, the lever is rotated by the motor against the urging force from the urging means. The force that the motor receives from the lever can be reduced. As a result, it is possible to reduce the power required to rotate the lever with the motor when taking the disk into the chassis.

  According to a first aspect of the present invention, there is provided a rotary table that rotatably holds a disk, a lever that rotates around a predetermined rotation fulcrum, contacts the periphery of the disk, and guides the disk on the rotary table, and a lever A biasing means for biasing a force for returning the lever to a predetermined standby position, and a cam provided between the lever and the biasing means for transmitting the biasing force of the biasing means to the lever. And the cam attenuates the urging force of the urging means transmitted to the lever as the rotation angle of the lever moves away from the standby position. The cam that is provided between the lever and the biasing means and transmits the biasing force of the biasing means to the lever attenuates the biasing force of the biasing means that is transmitted to the lever as the lever turns away from the standby position. As a result, the biasing force transmitted from the biasing means to the lever is attenuated according to the pivot angle of the lever, so even if the pivot angle of the lever increases and the force received from the biasing means increases. The urging force transmitted from the urging means to the lever can be reduced. As a result, since the urging force transmitted from the urging means to the lever is reduced, the urging force from the spring that attempts to return the lever to the rotation starting point is reduced even when the amount of rotation of the lever increases. The disk contact portion provided at the end of the lever does not continue to apply a large load to the disk. Further, the biasing force of the biasing means that is provided between the lever and the biasing means and that transmits the biasing force of the biasing means to the lever is transmitted to the lever so that the rotation angle of the lever is away from the standby position. Since the urging force transmitted from the urging means to the lever is attenuated according to the rotation angle of the lever, the lever is rotated by the motor against the urging force from the urging means. The force that the motor receives from the lever can be reduced. As a result, it is possible to reduce the power required to rotate the lever with the motor when taking the disk into the chassis.

  According to the second aspect of the present invention, the lever has a protrusion that contacts the cam, and the cam rotates while changing the position where the protrusion contacts according to the rotation angle of the lever, and the position where the protrusion contacts. By changing the angle, the direction of contact with the cam is changed, and the urging force received from the urging means is attenuated. As a result, the lever receives an urging force from the urging means via the protrusion, and the protrusion attenuates the urging force received from the urging means by changing the direction of contact with the cam. Therefore, the urging force from the urging means that becomes large can be attenuated with an easy configuration.

  The invention according to claim 3 is provided with a base for holding the fulcrum of the lever, the fulcrum of the lever is a protrusion provided on the base, the protrusion moves along a long hole provided in the lever, and is biased The amount of attenuation by the cam of the urging force transmitted from the means to the lever is determined by the position of the protrusion with respect to the protrusion and the direction of the protrusion contacting the cam. As a result, the direction in which the protrusion of the lever contacts the cam is changed according to the amount of rotation of the lever, and the engagement position between the protrusion and the long hole is moved in synchronization with the rotation of the lever, so that the protrusion cam Since the direction of contact and the position of the protrusion with respect to the protrusion are changed, the urging force transmitted from the urging means to the lever can be changed with a simpler structure according to the amount of rotation of the lever.

  According to a fourth aspect of the present invention, the cam includes two arm portions and a pivot shaft sandwiched between the two arm portions, one arm portion is connected to the biasing means, and the other arm portion is a protrusion of the lever. The urging force is transmitted from the urging means to the lever by rotating the cam around the rotation axis. As a result, one arm is a force point, the other arm is an action point, and the rotation shaft is a fulcrum, and the cam is composed of arm parts independent of the force point and the action point. The urging force transmitted to can be accurately transmitted. Further, since the cam has a fulcrum between the force point and the action point, the urging force from the spring can be efficiently transmitted to the pull-in lever even if the cam is downsized.

  According to a fifth aspect of the present invention, when the lever pulls the first disk and the second disk having a different diameter from the first disk onto the rotary table, and the cam is biased when the rotation angle of the lever is a predetermined angle or less. The amount of attenuation of the urging force transmitted from the means to the lever is reduced, and when the lever rotation angle exceeds a predetermined angle, the amount of urging force transmitted from the urging means to the lever is increased. It is. As a result, the urging force transmitted from the urging means to the lever is attenuated with high accuracy as necessary. Therefore, when the lever rotation angle is less than a predetermined angle, that is, when the first disk is guided into the chassis, the urging force is Efficiently transmits the urging force transmitted from the means to the lever to ensure that the first disk is guided into the chassis and is provided at the end of the lever when the lever rotation angle exceeds a predetermined angle and the lever reaches the rotation end point. The disc contact portion thus made does not continue to apply a large load to the disc. Further, since the urging force transmitted from the urging means to the lever is attenuated with high accuracy as necessary, the urging means is used when the rotation angle of the lever is not more than a predetermined angle, that is, when the first disk is guided into the chassis. When the first disk is reliably guided into the chassis by efficiently transmitting the urging force transmitted from the lever to the lever, the urging means is applied when the rotation angle of the lever exceeds a predetermined angle and the second disk is guided into the chassis. When the lever is rotated by the motor against the force, the force received by the motor from the lever is reduced, so that power consumption when driving the motor can be reduced.

  According to the sixth aspect of the present invention, the other arm portion has a curved shape, and the direction in which the protrusion abuts on the cam is changed while moving along the curved inner surface according to the amount of rotation of the lever. It is characterized by. As a result, the cam uses the inner surface of the arm portion to change the direction in which the protruding portion of the lever contacts the cam, so that it can be adjusted according to the amount of rotation of the lever without greatly affecting the component arrangement inside the disk device. Thus, the urging force transmitted from the urging means to the lever can be changed.

  The invention according to claim 7 is characterized in that the protrusion is a column extending toward the base. This minimizes the force received from the curved inner surface when the protrusion provided on the lever moves along the curved inner surface of the other arm provided on the cam. The lever can be moved smoothly.

  In the invention according to claim 8, the base, the lever and the cam are all plate-shaped, and the cam is disposed at a position where the main plane is sandwiched between the main plane of the base and the main plane of the retracting arm. It is characterized by that. Thereby, since the thickness direction of the base, the lever, and the cam is aligned in a constant direction, the cam can be arranged without greatly affecting the arrangement of components inside the optical disk apparatus, and a thin optical disk apparatus can be configured.

  The invention according to claim 9 is characterized in that the lever is substantially U-shaped, has a rotation center at one end, and has a disk contact portion that contacts the disk at the other end. To do. Thereby, by adjusting the length of one end and the other end, the rotation center of the lever and the position of the disk contact portion of the lever are changed, so the rotation center of the lever and the disk of the lever Since the positional relationship with the abutting portion can be given a degree of freedom and the other end can be arranged along the inner wall of the housing, even a thin disk device can interfere with components inside the disk device. The lever can be rotated while minimizing the above.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings.

  1 is a plan view of a base body of an optical disc apparatus according to Embodiment 1 of the present invention, FIG. 2 is a plan view of a lid of the optical disc apparatus according to Embodiment 1 of the present invention, and FIG. 3 is Embodiment 1 of the present invention. It is a front view of the bezel with which the front surface of the chassis exterior in is attached. 1a is a large diameter disk, 1b is a small diameter disk, 10 is a base body, 10a is a deep bottom part, 10b is a shallow bottom part, 11 is a disk insertion slot, 12 is a connector, 30 is a traverse, 31 is a spindle motor, 31a is a rotary table, 32 is a pickup, 33 is a drive motor, 40 is a main slider, 60 is a loading motor, 81 is a second disk guide, 90 is a sub-lever, 92 is a pivot point, 100 is a discharge lever, 101 is a fourth disk guide, and 102 is Rotation fulcrum, 103 is a contact portion, 110 is a regulating lever, 111 is a rotation fulcrum, 112 is a sixth disk guide, 130 is a lid, 140 is a bezel, 180 is a set guide lever, 181 is a rotation fulcrum, 182 Is the fifth disk guide, 201 is the retracting guide lever, 202 is the tip, 203 is the first disk guide, 01 draws the lever, 302 tip 303 third disc guide, 401 rear base, 501 cam, 502 is a spring. In the first embodiment, the rotary table is the rotary table 31a, the lever is the pull-in lever 301, the motor is the loading motor 60, the biasing means is the spring 502, the cam is the cam 501, the base is the rear base 401, and the disk contact portion is This corresponds to 303 for the third disk guide.

  In the optical disk apparatus according to the first embodiment, a base body 10 and a lid 130 form a chassis exterior, and a bezel 140 is mounted on the front surface of the chassis exterior. The bezel 140 is provided with a disk insertion slot 11, and has a slot-in configuration in which a large-diameter disk 1 a having a diameter of 12 cm and a small-diameter disk 1 b having a diameter of 8 cm are directly inserted from the disk insertion slot 11.

  Each component that performs a recording / reproducing function for the large-diameter disk 1a or the small-diameter disk 1b and a loading function for the large-diameter disk 1a or the small-diameter disk 1b is mounted on the base body 10.

  The base body 10 has a deep bottom portion 10a and a shallow bottom portion 10b with respect to the lid body 130, and a wing portion extending from the front surface to the rear surface is formed by the shallow bottom portion 10b.

  A disk insertion slot 11 into which a disk is directly inserted is formed on the front side of the base body 10, and a connector 12 is disposed at the end of the rear surface of the base body 10. The traverse 30 is disposed on the disk insertion slot 11 side of the base body 10, and the rear base 401 is disposed on the connector 12 side of the base body 10. A printed circuit board (not shown) is provided below the rear base 401.

  The traverse 30 holds a spindle motor 31, a pickup 32, and driving means for moving the pickup 32. The spindle motor 31 has a rotating table 31a that holds a disk on its rotating shaft. A spindle motor 31 that rotates the large-diameter disk 1 a or the small-diameter disk 1 b is provided on one end side of the traverse 30, and the pickup 32 is provided so as to be movable from one end side to the other end side of the traverse 30. The pickup 32 is disposed on the other end side of the traverse 30 when stopped.

  The drive means has a drive motor 33, a pair of rails for sliding the pickup 32, and a gear mechanism for transmitting the drive of the drive motor 33 to the pickup 32. The pair of rails are one end side and the other end of the traverse 30. It arrange | positions at both sides so that the side may be connected.

  In the traverse 30, the spindle motor 31 is located at the center of the base body 10, the reciprocating range of the pickup 32 is located closer to the disc insertion opening 11 than the spindle motor 31, and the reciprocating direction of the pickup 32 is It is arranged so as to be different from the insertion direction. Here, the reciprocating direction of the pickup 32 and the disc insertion direction are at an angle of 45 degrees.

  Next, a guide member that supports the disk when the large-diameter disk 1a or the small-diameter disk 1b is inserted and a lever member that operates when the disk is inserted will be described.

  A pull-in guide lever 201 is provided on one end side of the deep bottom portion 10a near the disc insertion slot 11. The pull-in guide lever 201 has a rotation fulcrum, and the tip 202 of the pull-in guide lever 201 moves while abutting against the side surface of the inserted disk by supporting the disk while rotating the fulcrum. Lead inside the chassis. A first disk guide 203 is provided at the distal end 202 of the pull-in guide lever 201. The first disk guide 203 is composed of two guide parts, and the disk is supported so as to be sandwiched between the two guide parts. .

  On the other hand, a large-diameter pulling lever 80 is provided on the other end side of the deep bottom portion 10a near the disc insertion slot 11. A second disk guide 81 is provided at the movable side end of the large-diameter pull-in lever 80. The second disk guide 81 is composed of a cylindrical roller, a part of the roller forms an upper guide, and a fixed portion is provided on a surface facing the upper guide, so that the disk is sandwiched between the upper guide and the fixed portion. Supported by

  Further, a long groove is provided between the movable side end portion and the fixed side end portion of the back surface (the surface on the base body 10 side) of the large diameter pull-in lever 80. On the other hand, a guide having a predetermined length is provided between the movable side end portion and the fixed side end portion of the surface of the large diameter pull-in lever 80.

  The large diameter pull-in lever 80 is operated by the sub lever 90.

  The sub lever 90 includes a convex portion at one end on the movable side, and a rotation fulcrum 92 on the other end side. The convex portion of the sub lever 90 slides in a long groove (not shown) of the large diameter pulling lever 80. Further, the rotation fulcrum 92 of the sub lever 90 is located on the main slider 40. The rotation fulcrum 92 is not linked to the main slider 40 and is fixed to the base body 10. Further, a pin is provided on the lower surface of the sub lever 90. This pin slides in a cam groove provided on the upper surface of the main slider 40. Therefore, the angle of the sub lever 90 is changed with the movement of the main slider 40, and the turning angle of the large diameter pulling lever 80 is changed by changing the angle of the sub lever 90. That is, the operation of the sub lever 90 causes the second disk guide 81 of the large diameter pull-in lever 80 to move closer to and away from the spindle motor 31.

  A discharge lever 100 is provided on a side portion of the base body 10 that is different from the large-diameter pull-in lever 80. A fourth disk guide 101 is provided at the movable side end of the discharge lever 100. A rotation fulcrum 102 is provided on the other end side of the discharge lever 100. Further, a contact portion 103 is provided on the movable side end of the discharge lever 100 on the rear surface side of the fourth disc guide 101. Further, the discharge lever 100 is provided with an elastic body, and the discharge lever 100 is urged to rotate in the direction of the disc insertion slot 11 by the elastic force of the elastic body. Note that the discharge lever 100 operates in conjunction with the movement of the main slider 40.

  A restriction lever 110 is provided on the rear surface side of the base body 10. The regulating lever 110 has a rear surface side end as a rotation fulcrum 111 and a movable side end provided with a sixth disk guide 112. The restriction lever 110 is urged by an elastic body so that the sixth disk guide 112 side always protrudes to the front side. The restriction lever 110 operates the limit switch at a predetermined position. That is, when the large-diameter disk 1a is inserted to a predetermined position, the limit switch is turned off and the loading motor 60 is driven. By driving the loading motor 60, the main slider 40 slides.

  A set guide lever 180 is provided on the side of the base body 10 on the same side as the discharge lever 100. The set guide lever 180 has a rotation fulcrum 181 on the rear surface side and a fifth disc guide 182 on the movable side. The set guide lever 180 is urged by an elastic body so that the fifth disk guide 182 side protrudes toward the disk side. The set guide lever 180 operates in conjunction with the main slider 40 so that the fifth disk guide 182 side is separated from the disk in accordance with the movement of the main slider 40.

  A pull-in lever 301 is provided on the side of the base body 10 opposite to the set guide lever 180. The pull-in lever 301 has a substantially U-shape, is rotatably held by a rear base 401 fixed to the base body 10, and has a rotation center on the rear surface side which is one end portion. A third disc guide 303 that comes into contact with the disc is provided at the movable end 302, which is the other end. The pull-in lever 301 is urged so that the third disk guide 303 approaches the spindle motor 31 by the force of the spring 502 via the cam 501. Accordingly, by adjusting the lengths of one end and the other end, the rotation center of the pull-in lever 301 and the position of the disk contact portion of the pull-in lever 301 are changed. Since the center and the disk contact portion of the pull-in lever 301 have a degree of freedom, and the other end can be arranged along the inner wall of the housing, even a thin disk device, The lever can be rotated while minimizing interference with the components inside the disk device.

  Hereinafter, the movement of each member when the small-diameter disk 1b is inserted will be described with reference to FIG. 1, FIG. 5, FIG. 6, and FIG.

  As shown in FIG. 1, in a state where the small-diameter disk 1b is not inserted, the pull-in guide lever 201 and the pull-in lever 301 are on standby in a state where they are rotated by a fixed angle toward the spindle motor 31 side. In this state, the distance between the first disk guide 203 of the pull-in guide lever 201 and the third disk guide 303 of the pull-in lever 301 is narrower than the diameter of the small-diameter disk 1b.

  At the initial stage when the small-diameter disk 1 b is inserted, the position of the small-diameter disk 1 b is regulated by the pull-in guide 201 and the pull-in lever 301. Thereafter, when the small-diameter disk 1b is further pushed in, the pull-in guide lever 201 and the pull-in lever 301 pivot in a direction away from the spindle motor 31 along with the insertion operation.

  FIG. 4 is a plan view of the base body of the optical disc apparatus according to Embodiment 1 of the present invention. In order to make the relationship among the spring 502, the cam 501 and the pull-in lever 301 easier to understand, the regulating lever 110 and the traverse 30 are removed from FIG. It is shown. FIG. 5 is a plan view showing the relationship among the spring, cam, and pull-in lever at the initial stage when the small-diameter disk is inserted, and shows the same state as that shown in FIG. 301a is a protrusion, 304 is a second protrusion, 305 is a long hole, 305a is a fixed fulcrum position, 305b is a moving fulcrum area, 401a is a hook part, 402 is a protrusion, 403 is a second long hole, 403a is a first area, Reference numeral 403b denotes a second region, 403c denotes an end, 501a denotes a rotation shaft, 501b denotes an arm, 501c denotes an arm, 502a denotes an end, and 502b denotes an end. In the first embodiment, the protrusion corresponds to the protrusion 301a, the protrusion provided on the base corresponds to the protrusion 402, and the long hole provided to the lever corresponds to the long hole 305.

  The rear base 401 has a protrusion 402, and the pull-in lever 301 has a second protrusion 304. The pull-in lever 301 has a long hole 305 that engages with the protrusion 402, and the rear base 401 has a second long hole 403 that engages with the second protrusion 304. The pull-in lever 301 is rotatably held by a rear base 401 fixed to the base body 10, and a pivot point of the pull-in lever 301 that guides the small-diameter disk 1 b into the chassis is a protrusion 402 of the rear base 401.

  The protrusion 402 of the rear base 401 has a cylindrical shape, and the side surface of the protrusion 402 moves along the elongated hole 305 of the pull-in lever 301. Thus, the rotation fulcrum of the drawing lever 301 is movable. Further, the second protrusion 304 of the pull-in lever 301 has a cylindrical shape like the protrusion 402, and the side surface of the second protrusion 304 moves along the second long hole 403 of the rear base 401. When the inserted small-diameter disk 1b comes into contact with the third disk guide 303 provided at the movable end portion 302 of the pull-in lever 301 and rotates the third disk guide 303, the rear base 401 has a second one according to the amount of rotation. The second protrusion 304 of the pull-in lever 301 moves inside the second long hole 403. Corresponding to the movement of the second protrusion 304, the engagement position of the protrusion 402 of the rear base 401 and the elongated hole 305 of the pull-in lever 301 changes.

  The long hole 305 includes a fixed fulcrum position 305 a where the rotation fulcrum of the pull-in lever 301 is fixed, and a movement fulcrum region 305 b where the rotation fulcrum of the pull-in lever 301 moves according to the rotation angle of the pull-in lever 301. ing.

  The second long hole 403 includes a first region 403a in which the second protrusion 304 of the pull-in lever 301 moves along the circumference of a circle centered on the protrusion 402 of the rear base 401, and the pull-in lever 301 rotates over a predetermined angle. The second projection 403b moves along a linear groove that is different from the circumference of the circle centered on the projection 402 when moved. When the pull-in lever 301 rotates beyond a predetermined angle, the second protrusion 304 moves from the first area 403a of the second long hole 403 to the second area 403b, thereby moving the protrusion 402 to the movement fulcrum area 305b of the long hole 305. It is set as the structure rotated while moving a rotation fulcrum along. Here, since the protrusion 402 and the second protrusion 304 have a cylindrical shape, the side surfaces of the columnar shape move along the long hole 305 and the second long hole 403, respectively. Since the engagement and the engagement between the second protrusion 304 and the second elongated hole 403 are smoothly performed, the force for rotating the pull-in lever 301 can be minimized.

  Further, the second region 403b of the second long hole 403 is arranged so that the distance from the fixed fulcrum position 305a of the long hole 305 is closer as it is away from the first region 403a. Accordingly, when the second protrusion 304 of the pull-in lever 301 moves along the second long hole 403 and the second region 403b, the fulcrum of the pull-in lever 301 is continuously moved, and the pull-in lever 301 that contacts the small-diameter disk 1b is moved. Since the rotation trajectory of the third disc guide 303 located at the distal end 302 is gently changed, the projection 402 of the rear base 401 does not receive a sudden load from the long hole 305 when moving through the long hole 305 of the pull-in lever 301. You can

  The rear base 401 is provided with a hooking portion 401a for hooking one end of a spring 502 that biases the force to return the pulling lever 301 to the standby position. One end portion 502 a of the spring 502 is connected to the hook portion 401 a, and the other end portion 502 b is connected to an arm portion 501 b that forms one end of the cam 501. Since the hook portion 401a is a fixed end, the urging force of the spring 502 is generated by the end portion 502b moving in a telescopic manner.

  The rear base 401 is provided with a protrusion 402. The protrusion 402 serves as a rotation fulcrum of the pull-in lever 301, and the protrusion 402 moves along the elongated hole 305 provided with the pull-in lever 301. Therefore, the pull-in lever 301 rotates while displacing the rotation fulcrum.

  The cam 501 is provided between the rear base 401 and the pull-in lever 301. The rear base 401, the pull-in lever 301, and the cam 501 have a flat plate shape, and the cam 501 is disposed such that its main plane is sandwiched between the main plane of the rear base 401 and the main plane of the pull-in lever 301. Accordingly, the thickness direction of the rear base 401, the pull-in lever 301, and the cam 501 is aligned in a certain direction, so that the cam 501 can be arranged without greatly affecting the arrangement of components inside the optical disk apparatus, and a thin optical disk apparatus can be obtained. Can be configured.

  Further, the cam 501 has an arm portion 501c separately from the arm portion 501b, and has a rotating shaft 501a sandwiched between the arm portion 501b and the arm portion 501c. When the arm portion 501b receives a biasing force from the spring 502 and the cam 501 rotates about the rotation shaft 501a, the position of the arm portion 501c is displaced in the rotation direction. The pull-in lever 301 is provided with a protrusion 301a extending toward the rear base 401. The side surface of the protrusion 301a abuts on the side surface of the arm portion 501c, and the urging force from the spring 502 is transmitted via the cam 501. Is done. As described above, one arm 501b serves as a power point, the other arm 501c serves as an action point, and the rotation shaft 501a serves as a fulcrum, and the cam 501 is constituted by an arm part independent of the force point and the action point. The urging force transmitted to the pull-in lever 301 via 501 can be transmitted with high accuracy. Further, since the cam 501 has a fulcrum between the force point and the action point, the urging force from the spring 502 can be efficiently transmitted to the pull-in lever 301 even if the cam 501 is downsized.

  The arm portion 501c of the cam 501 has a curved shape, and the protrusion 301a of the pull-in lever 301 moves in accordance with the amount of rotation of the pull-in lever 301 while the arm portion 501c moves along the curved inner surface. The direction of contact with is changed. As a result, the cam 501 uses the inner surface of the arm 501c to change the direction in which the protrusion 301a of the pull-in lever 301 abuts the cam 501, so that the component arrangement inside the disk device is not greatly affected. The urging force transmitted from the spring 502 to the pulling lever 301 can be changed according to the rotation amount of the pulling lever 301.

  The protrusion 301 a is a cylinder extending toward the rear base 401. This minimizes the force received from the curved inner surface when the protrusion 402 provided on the pull-in lever 301 moves along the curved inner surface of the arm portion 501c provided on the cam 501. The pulling lever 301 driven by the loading motor 60 can be moved smoothly.

  Here, the urging force transmitted from the spring 502 to the pull-in lever 301 is attenuated by the cam 501. The amount of attenuation at this time is determined from the position of the protrusion 402 with respect to the protrusion 301a and the direction in which the protrusion 301a contacts the cam. In the case of FIG. 5, which is the initial stage when the small-diameter disk 1b is inserted, the direction of the force received by the protrusion 301a from the cam 501 is the direction of arrow A. Therefore, the amount of attenuation of the urging force from the spring 502 by the cam 501 is It is proportional to the moment amount L53 with respect to the protrusion 402 of the part 301a.

Therefore, the urging force transmitted from the spring 502 to the pull-in lever 301 includes the spring load E5 calculated based on the extension amount of the spring 502 obtained from the length G5 of the spring 502, the end 502b of the spring 502, and the cam 501. The distance L51 from the rotation shaft 501a, the moment amount L52 of the projection 301a with respect to the rotation shaft 501a of the cam 301, the moment amount L53 of the projection 301a with respect to the projection 402, and the third disc guide 303 and projection 402 It can be calculated from the relationship with the distance L54. The urging force F5 transmitted from the spring 502 to the third disk guide 303 in FIG.
F5 = (E5 × L51 × L53) / (L52 × L54) (Expression 1)
Is calculated by

  Hereinafter, the movement of each member when the large-diameter disk 1a is inserted will be described with reference to FIGS.

  FIG. 6 is a plan view of the base main body of the optical disc apparatus according to Embodiment 1 of the present invention, showing a stage during insertion of a small-diameter disc. FIG. 7 is a plan view showing the relationship between the pull-in lever and the rear base in the middle stage of inserting the small-diameter disk, and shows the same state as that shown in FIG.

  From the initial stage of inserting the disk shown in FIG. 4 to the intermediate stage of inserting the small-diameter disk shown in FIG. 6, the second protrusion 304 of the pull-in lever 301 starts from the middle of the first area 403a corresponding to the standby position of the pull-in lever 301. It moves toward the second area 403b and stops once immediately after entering the second area 403b. At this time, when the protrusion 304 moves along the first region 403a, the first region 403a is formed along the circumference of a circle centered on the protrusion 402, and therefore the protrusion 402 of the rear base 401 is formed. It does not move from the fixed fulcrum position 305 a of the elongated hole 305 of the pull-in lever 301. Further, when the protrusion 304 is moving along the second region 403b, the second region 403b is not formed along the circumference of the circle centered on the protrusion 402, so that the protrusion 402 of the rear base 401 is retracted. The fixed fulcrum position 305a of the long hole 305 of the lever 301 leaves the moving fulcrum area 305b. Therefore, the turning trajectory of the distal end portion 302 of the pull-in lever 301 initially draws a circular orbit and then changes to an elliptical orbit.

  Here, the position at which the second protrusion 304 temporarily stops after the movement starts is such that the distance between the first disk guide 203 of the pull-in guide lever 201 and the third disk guide 303 of the pull-in lever 301 is substantially the same as the diameter of the small-diameter disk 1b. When it is.

  When the small-diameter disk 1b is further inserted from the state shown in FIGS. 1 and 4, one end of the disk is supported by the pull-in guide lever 201 and the other end is supported by the pull-in lever 301. The pull-in lever 301 is a spindle motor. It is in a state farthest from 31. In this state, the distance between the first disk guide 203 of the pull-in guide lever 201 and the third disk guide 303 of the pull-in lever 301 is the same as the diameter of the small-diameter disk 1b.

  From this point, when the small-diameter disk 1 b is further pushed in, the third disk guide 303 of the pull-in lever 301 starts to move in the direction closer to the spindle motor 31 with this insertion operation. With this operation, the small-diameter disk 1 b is further drawn into the chassis, abuts on the fourth disk guide 101 of the discharge lever 100, the discharge lever 100 rotates, and the discharge lever 100 approaches the spindle motor 31. By rotating a predetermined angle, a limit switch (not shown) is operated, and driving of the loading motor 60 is started. At this time, the small-diameter disk 1 b is supported at three points: the first disk guide 203 of the pull-in guide lever 201, the third disk guide 303 of the pull-in lever 301, and the fourth disk guide 101 of the discharge lever 100.

  When the driving of the loading motor 60 is started, the pulling lever 301 is urged through the cam mechanism in the direction of turning to the spindle motor 31 side. Accordingly, the pull-in lever 301 biases the small-diameter disk 1b in the direction of pulling it into the chassis. Due to the urging force of the pull-in lever 301, the small-diameter disk 1b leaves the artificial operation and is pushed further.

  Here, the urging force transmitted from the spring 502 to the pull-in lever 301 is attenuated by the cam 501. The amount of attenuation at this time is determined from the position of the protrusion 402 with respect to the protrusion 301a and the direction in which the protrusion 301a contacts the cam. In the case of FIG. 7 in the middle of inserting the small-diameter disk 1b, the direction of the force received by the protrusion 301a from the cam 501 is the direction of arrow B. Therefore, the amount of attenuation of the urging force from the spring 502 by the cam 501 is This is proportional to the moment amount L73 with respect to the protrusion 402 of the lens.

Therefore, the urging force transmitted from the spring 502 to the pull-in lever 301 includes the spring load E7 calculated based on the extension amount of the spring 502 obtained from the length G7 of the spring 502, the end 502b of the spring 502, and the cam 501. Distance L71 from the rotation shaft 501a, a moment amount L72 of the protrusion 301a relative to the rotation shaft 501a of the cam 501; a moment amount L73 of the protrusion 301a relative to the protrusion 402; and the third disc guide 303 and the protrusion 402. It can be calculated from the relationship with the distance L74. The urging force F7 transmitted from the spring 502 in FIG.
F7 = (E7 × L71 × L73) / (L72 × L74) (Expression 2)
Is calculated by

  FIG. 8 is a plan view of the base main body of the optical disk apparatus according to Embodiment 1 of the present invention, showing a stage in the middle of inserting a large-diameter disk. In order to make the relationship between the spring 502, the cam 501, and the pull-in lever 301 easy to understand, the restriction lever 110 and the traverse 30 shown in FIG. 1 are removed. 9 is a plan view showing the relationship between the pull-in lever and the rear base in Embodiment 1 of the present invention, and shows the same state as that shown in FIG.

  In a range in which the retracting lever 301 rotates within a predetermined angle, the second protrusion 304 of the retracting lever 301 moves from the end 403c of the first region 403a of the second elongated hole 403 toward the second region 403b. At this time, since the first region 403a is formed along the circumference of a circle centered on the protrusion 402 of the rear base 401, the protrusion 402 of the rear base 401 moves from the fixed fulcrum position 305a of the elongated hole 305 of the pull-in lever 301. do not do. Therefore, the turning trajectory of the distal end portion 302 of the retracting lever 301 is a circular trajectory.

  When the large-diameter disk 1a is further pushed in from this state, the distance between the first disk guide 203 of the pull-in guide lever 201 and the third disk guide 303 of the pull-in lever 301 is further increased. With this operation, the large-diameter disk 1a is further drawn into the chassis, abuts on the sixth disk guide 112 of the restriction lever 110, and the restriction lever 110 rotates, and the restriction lever 110 approaches the spindle motor 31. By rotating a predetermined angle in the direction, a limit switch (not shown) is operated, and driving of the loading motor 60 is started. When the distance between the first disc guide 203 and the third disc guide 303 is the same as that of the large-diameter disc 1a, the first disc guide of the retracting guide lever 201 and the third disc guide 303 of the retracting lever 301 are supported. The large-diameter disc 1a that has been used is mainly supported by three guides: a sixth disc guide 112 of the regulating lever 110, a fifth disc guide 182 of the set guide lever 180, and a second disc guide 81 of the large-diameter pull-in lever 80. The fourth disc guide 101 of the discharge lever 100 and the third disc guide 303 of the pull-in lever 301 are supplementarily supported by two guides.

  Thereafter, the pulling lever 301 is urged by the driving force of the loading motor 60 in the direction of turning to the spindle motor 31 via the cam mechanism. Here, the pull-in lever 301 serves as a guide wall for smoothly pulling the large-diameter disk 1a into the chassis, and the large-diameter pull-in lever 80 rotates and the second disk guide 81 of the large-diameter pull-in lever 80 serves as the large-diameter disk. By pushing 1a, the large-diameter disk 1a is pushed further away from the artificial operation.

  The large-diameter disk 1a is mainly supported by three guides: a sixth disk guide 112 of the regulating lever 110, a fifth disk guide 182 of the set guide lever 180, and a second disk guide 81 of the large-diameter pull-in lever 80. The center hole moves to a position corresponding to the rotary table 31a and is regulated at that position.

  Then, the traverse 30 starts operating. That is, the traverse 30 starts to move in a direction in which the spindle motor 31 side approaches the lid body 130. In a state where the spindle motor 31 side is operated in the direction closest to the lid 130, the large-diameter disk 1 a comes into contact with the lid 130 and is pressed by the spindle motor 31 and the lid 130. With this pressing force, the hub of the spindle motor 31 is fitted into the center hole of the large-diameter disk 1a, and the chucking is completed. When the chucking is completed, the traverse 30 operates in a direction in which the spindle motor 31 side is separated from the lid body 130. This operation is further performed by driving the loading motor 60.

  Here, the urging force transmitted from the spring 502 to the pull-in lever 301 is attenuated by the cam 501. The amount of attenuation at this time is determined from the position of the protrusion 402 with respect to the protrusion 301a and the direction in which the protrusion 301a contacts the cam. In the case of FIG. 9 in the middle stage of inserting the large-diameter disk 1a, the direction of the force received by the protrusion 301a from the cam 501 is the direction of arrow C, so the amount of attenuation of the urging force from the spring 502 by the cam 501 is It is proportional to the moment amount L93 with respect to the protrusion 402 of 301a.

Therefore, the urging force transmitted from the spring 502 to the pull-in lever 301 includes the spring load E9 calculated based on the extension amount of the spring 502 obtained from the length G9 of the spring 502, the end 502b of the spring 502, and the cam 501. The distance L91 from the rotation shaft 501a, the moment amount L92 of the protrusion 301a with respect to the rotation shaft 501a of the cam 501, the moment amount L93 of the protrusion 301a with respect to the protrusion 402, and the third disk guide 303 and the protrusion 402 It can be calculated from the relationship with the distance L94. The urging force F9 transmitted from the spring 502 in FIG.
F9 = (E9 × L91 × L93) / (L92 × L94) (Formula 3)
Is calculated by

  FIG. 10 is a plan view of the base main body of the optical disk apparatus according to Embodiment 1 of the present invention, and shows the stage for completing the large-diameter disk loading. FIG. 11 is a view showing the relationship between the pull-in lever and the rear base at the stage of completing the loading of the large-diameter disc, and shows the same state as that shown in FIG.

  When the chucking of the large-diameter disk 1a is completed, the fifth disk guide 182 of the set guide lever 180 supporting the large-diameter disk 1a, the sixth disk guide 112 of the regulating lever 110, and the third disk of the retracting lever 301 are completed. The guide 303, the second disk guide 81 of the large-diameter pull-in lever 80, and the fourth disk guide 101 of the discharge lever 100 move outward in the radial direction of the large-diameter disk 1a. As a result, the fifth disk guide 182, the sixth disk guide 112, the third disk guide 303, the second disk guide 81, and the fourth disk guide 101 are separated from the large-diameter disk 1a by a certain distance. The large-diameter disk 1a does not interfere with the rotation.

  Here, the moving fulcrum region 305b of the long hole 305 is provided with a tapered relief at the end of the projection 402 moving in the moving fulcrum region 305b, and when the retracting lever 301 is rotated to the maximum, The width of the groove where the protrusion 402 is located is larger than the groove width of the fixed fulcrum position 305a. As a result, when the retracting lever 301 rotates to the maximum and the leading end 302 of the retracting lever 301 moves to the retracted position, the leading end 302 of the retracting lever 301 comes into contact with the inner wall of the chassis. Even in the case where a load is generated in the engaging portion between the long hole 305 of the pull-in lever 402 and the pull-in lever 301, the end opposite to the tip 302 of the pull-in lever 301 is within the groove width of the moving fulcrum region 305b. Since the load is released by the movement, an excessive load is not applied between the protrusion 402 of the rear base 401 and the long hole 305 of the pull-in lever 301. As a result, an excessive load is not applied between the protrusion 402 of the rear base 401 and the elongated hole 305 of the pull-in lever 301. Therefore, the rear base 401 is caused by the tip 302 of the pull-in lever 301 contacting the inner wall of the chassis. The projection 402 and the elongated hole 305 of the pull-in lever 301 are not damaged.

  Here, the urging force transmitted from the spring 502 to the pull-in lever 301 is attenuated by the cam 501. The amount of attenuation at this time is determined from the position of the protrusion 402 with respect to the protrusion 301a and the direction in which the protrusion 301a contacts the cam. In the case of FIG. 11 in which the loading of the large-diameter disk 1a is completed, the direction of the force received by the protrusion 301a from the cam 501 is the direction of arrow D, so the amount of attenuation of the urging force from the spring 502 by the cam 501 is It is proportional to the moment amount L113 with respect to the protrusion 402 of 301a.

Therefore, the urging force transmitted from the spring 502 to the pull-in lever 301 includes the spring load E11 calculated based on the amount of extension of the spring 502 obtained from the length G11 of the spring 502, the end 502b of the spring 502, and the cam 501. Distance L111 of the projection 301a with respect to the rotation shaft 501a, moment L112 of the cam 301 with respect to the rotation shaft 501a, moment L113 with respect to the projection 402 of the projection 301a, and the third disc guide 303 and projection 402. It can be calculated from the relationship with the distance L114. The urging force F11 transmitted from the spring 502 in FIG.
F11 = (E11 × L111 × L113) / (L112 × L114) (Expression 4)
Is calculated by

  FIG. 12 is a diagram showing the relationship between the amount of extension of the spring and the load applied to the disk contact portion of the retracting lever in Embodiment 1 of the present invention, where the horizontal axis is the amount of spring extension and the vertical axis is the disk contact of the retracting lever. The load applied to the contact portion is shown. In FIG. 12, point P1 shows the relationship between the length B5 of the spring 502 shown in FIG. 5 and the load applied to the third disc guide 303 of the pull-in lever 301, and point P2 pulls in with the length B7 of the spring 502 shown in FIG. The relationship between the load applied to the third disk guide 303 of the lever 301 is shown, the point P3 shows the relationship between the length B9 of the spring 502 shown in FIG. 9 and the load applied to the third disc guide 303 of the retracting lever 301, and the point P4 11 shows the relationship between the length B11 of the spring 502 shown in FIG. 11 and the load applied to the third disc guide 303 of the retracting lever 301.

  In the conventional case shown in FIG. 13, the load applied to the disk contact portion of the pull-in lever increases as the amount of extension of the spring increases, but according to the present invention shown in FIG. The load applied to a certain third disk guide decreases as the extension amount of the spring 502 increases. That is, the cam 501 that transmits the urging force of the spring 502 to the pulling lever 301 attenuates the urging force of the spring 502 that is transmitted to the pulling lever 301 as the rotation angle of the pulling lever 301 moves away from the standby position. Here, the points P1, P2, P3, and P4 in FIG. 12 correspond to the points P1 ', P2', P3 ', and P4' in FIG. 13, respectively.

  At this time, when the extension amount of the spring 502 is equal to or less than a predetermined value, that is, when the rotation angle of the pull-in lever 301 is equal to or smaller than a predetermined angle, the attenuation amount of the urging force transmitted from the spring 502 to the pull-in lever 301 is reduced. When the extension amount of 502 exceeds a certain value, that is, when the rotation angle of the pull-in lever 301 exceeds a predetermined angle, the amount of attenuation of the urging force transmitted from the spring 502 to the pull-in lever 301 is increased. As a result, the urging force transmitted from the spring 502 to the pull-in lever 301 is attenuated with high accuracy as necessary. Therefore, when the rotation angle of the pull-in lever 301 is equal to or smaller than a predetermined angle, that is, when the small-diameter disk 1b is guided into the chassis. The urging force transmitted from the spring 502 to the pulling lever 301 is efficiently transmitted to reliably guide the small-diameter disk 1b into the chassis, and the pulling lever 301 reaches a rotation end point when the rotation angle of the pulling lever 301 exceeds a predetermined angle. At this time, the third disk guide 303 provided at the tip of the pull-in lever 301 does not continue to apply a large load to the disk. Further, since the biasing force transmitted from the spring 502 to the pull-in lever 301 is attenuated with high accuracy as necessary, when the rotation angle of the pull-in lever 301 is equal to or smaller than a predetermined angle, that is, when the small-diameter disk 1b is guided into the chassis, The biasing force transmitted from the spring 502 to the pull-in lever 301 is efficiently transmitted to reliably guide the small-diameter disk 1b into the chassis, and the rotation angle of the pull-in lever 301 exceeds a predetermined angle to guide the large-diameter disk 1a into the chassis. When the pulling lever 301 is rotated by the loading motor 60 against the biasing force of the spring 502, the force received by the loading motor 60 from the pulling lever 301 is reduced, so that power consumption when driving the loading motor 60 is reduced. Can be reduced.

  In the case of the first embodiment, when the extension amount of the spring 502 is G7 or less shown in FIG. 12, the attenuation amount of the urging force transmitted from the spring 502 to the pulling lever 301 is reduced, and the extension amount of the spring 502 is shown in FIG. When G7 is exceeded, the amount of attenuation of the urging force transmitted from the spring 502 to the pull-in lever 301 is increased.

  As described above, the cam 501 provided between the pull-in lever 301 and the spring 502 and transmitting the urging force of the spring 502 to the pull-in lever 301 is pulled in so that the rotation angle of the pull-in lever 301 is separated from the standby position. By attenuating the biasing force of the spring 502 transmitted to the lever 301, the biasing force transmitted from the spring 502 to the pulling lever 301 is attenuated according to the pivoting angle of the pulling lever 301. Even when the force received from the spring 502 is increased, the urging force transmitted from the spring 502 to the pulling lever 301 can be reduced. As a result, since the urging force transmitted from the spring 502 to the pull-in lever 301 is reduced, even if the amount of rotation of the pull-in lever 301 is increased, the spring 502 that attempts to return the pull-in lever 301 to the rotation start point. The third disc guide 303 provided at the front end of the pull-in lever 301 does not continuously apply a large load to the disc. Further, a cam 501 provided between the pull-in lever 301 and the spring 502 and transmitting the urging force of the spring 502 to the pull-in lever 301 causes the pull-in lever 301 to move toward the pull-out lever 301 so that the rotation angle of the pull-in lever 301 moves away from the standby position. By attenuating the urging force of the spring 502 to be transmitted, the urging force transmitted from the spring 502 to the pulling lever 301 is attenuated according to the rotation angle of the pulling lever 301, so that the pulling lever 301 is biased by the spring 502. When the loading motor 60 is rotated against this, the force that the loading motor 60 receives from the pull-in lever 301 can be reduced. As a result, it is possible to reduce the power required to rotate the pull-in lever 301 by the loading motor 60 when the disk is taken into the chassis.

  Further, the pull-in lever 301 has a protrusion 301 a that contacts the cam 501. The cam 501 rotates while changing the position where the protrusion 301 contacts according to the rotation angle of the pull-in lever 301. When the position of contact with the cam 501 changes, the direction of contact with the cam 501 is changed, and the biasing force received from the spring 502 is attenuated. As a result, the pulling lever 301 receives an urging force from the spring 502 via the protrusion 301 a, and the protrusion 301 a attenuates the urging force received from the spring 501 by changing the direction of contact with the cam 501. The urging force from the spring 502 that increases according to the rotation angle can be changed with an easy configuration.

  Even when the amount of rotation of the lever increases, the urging force from the urging means that attempts to return the lever to the rotation start point is reduced, and the disc contact portion provided at the tip of the lever is large on the disc. Since it is possible to reduce the electric power required to rotate the lever with a motor when the disk is taken into the chassis without applying a load, it is applicable to a slot-in type optical disk apparatus.

FIG. 3 is a plan view of the base body of the optical disc apparatus according to Embodiment 1 of the present invention. FIG. 3 is a plan view of the lid of the optical disc device according to the first embodiment of the present invention. The front view of the bezel with which the front surface of the chassis exterior in Embodiment 1 of this invention is mounted | worn FIG. 3 is a plan view of the base body of the optical disc apparatus according to Embodiment 1 of the present invention. A plan view showing the relationship between the spring, cam, and pull-in lever in the initial stage when inserting a small-diameter disc FIG. 3 is a plan view of the base body of the optical disc apparatus according to Embodiment 1 of the present invention. Plan view showing the relationship between the pull-in lever and the rear base in the middle of inserting a small-diameter disk FIG. 3 is a plan view of the base body of the optical disc apparatus according to Embodiment 1 of the present invention. The top view which shows the relationship between the drawing lever and rear base in Embodiment 1 of this invention FIG. 3 is a plan view of the base body of the optical disc apparatus according to Embodiment 1 of the present invention. Diagram showing the relationship between the pull-in lever and the rear base when the large-diameter disc is loaded The figure which shows the relationship between the load applied to the disk contact part of the retracting lever and the amount of extension of the spring in Embodiment 1 of this invention The figure which shows the relationship of the load applied to the disk contact part of the conventional spring extension amount, and a pull-in lever

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Large diameter disk 1b Small diameter disk 10 Base main body 10a Deep bottom part 10b Shallow bottom part 11 Disk insertion slot 12 Connector 30 Traverse 31 Spindle motor 31a Rotary table 32 Pickup 33 Drive motor 40 Main slider 60 Loading motor 80 Large diameter pull-in lever 81 2nd disk Guide 90 Sub-lever 92 Rotating fulcrum 100 Ejecting lever 101 Fourth disc guide 102 Rotating fulcrum 103 Abutting portion 110 Regulating lever 111 Rotating fulcrum 112 Sixth disc guide 130 Lid 140 Bezel 180 Set guide lever 181 Rotating fulcrum 182 First 5 Disc guide 201 Pull-in guide lever 202 Tip 203 First disc guide 301 Pull-in lever 301a Protruding portion 302 Tip portion 303 Third disc Scroll guide 304 Second projection 305 Long hole 305a Fixed fulcrum position 305b Moving fulcrum region 401 Rear base 401a Hooking portion 402 Projection 403 Second elongated hole 403a First region 403b Second region 403c End 501 Cam 501a Rotating shaft 501b, 501c Arm Part 502 Spring 502a, 502b End

Claims (9)

A rotary table that holds the disc rotatably;
A lever that rotates around a predetermined rotation fulcrum, contacts the periphery of the disk, and guides the disk on the rotary table;
A motor for driving the lever;
Biasing means for biasing the lever to return the lever to a predetermined standby position;
A cam that is provided between the lever and the biasing means and transmits the biasing force of the biasing means to the lever;
The optical disk apparatus according to claim 1, wherein the cam attenuates the urging force of the urging means transmitted to the lever as the rotation angle of the lever moves away from the standby position. The lever has a protrusion that contacts the cam;
The cam rotates while changing the position where the projection abuts according to the rotation angle of the lever,
2. The optical disk apparatus according to claim 1, wherein the protrusion changes the direction of contact with the cam by changing the position of contact, and attenuates the biasing force received from the biasing means. Comprising a base for holding the fulcrum of the lever;
The fulcrum of the lever is a protrusion provided on the base, the protrusion moves along a long hole provided in the lever,
The amount of attenuation by the cam of the urging force transmitted from the urging means to the lever is determined by the position of the protrusion with respect to the protrusion and the direction of the protrusion in contact with the cam. The optical disk apparatus according to claim 2. The cam includes two arm portions and a pivot shaft sandwiched between the two arm portions,
One arm is connected to the biasing means, the other arm is in contact with the protrusion of the lever,
2. The optical disc apparatus according to claim 1, wherein the biasing force is transmitted from the biasing means to the lever by rotating the cam about the rotation shaft. The lever pulls the first disk and a second disk having a different diameter from the first disk onto the rotary table,
The cam reduces the amount of attenuation of the urging force transmitted from the urging means to the lever when the rotation angle of the lever is a predetermined angle or less, and urges the cam when the rotation angle of the lever exceeds the predetermined angle. 5. The optical disk apparatus according to claim 4, wherein the amount of attenuation of the urging force transmitted from the means to the lever is increased. The other arm is curved,
5. The optical disc apparatus according to claim 4, wherein the protrusion changes a direction in contact with the cam while moving along the curved inner surface in accordance with a rotation amount of the lever. The optical disk apparatus according to claim 4, wherein the protrusion is a cylinder extending toward the base. The base, the lever and the cam are all flat plate shapes,
5. The optical disk apparatus according to claim 4, wherein the cam is disposed at a position where the main plane is sandwiched between the main plane of the base and the main plane of the pull-in lever. 9. The lever according to claim 8, wherein the lever has a substantially U-shape, and has a rotation center at one end and a disk contact portion that contacts the disk at the other end. Optical disk device.

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