JP2010267306A - Pickup drive mechanism, and disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pickup drive mechanism and a disk drive in which a load on a lead screw is reduced. <P>SOLUTION: The pickup drive mechanism 110 has a lead screw 111, a guide shaft 112 arranged in parallel with this lead screw 111, a carriage 114 supported by this guide shaft 112 in a manner free to move axially and having a gear 130 to engage with the lead screw 111, and a pickup for a recording medium loaded on this carriage 114. A frame 117 is arranged along the axis of the lead screw 111, and a stopper 140 is formed on the carriage 114 to hit the frame 117 to regulate moving of the gear 130 toward the lead screw 111. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pickup drive mechanism and a disk device that drive a carriage that is supported on a guide shaft so as to be movable in the axial direction.

Generally, a disk device that reproduces information of a recording medium disk such as a CD (compact disk) or a DVD (digital versatile disk) chucks the disk on a turntable, and rotates the turntable in this state. And a pickup drive mechanism that slides a pickup that reads information from the rotated disk in the radial direction of the disk (see, for example, Patent Document 1).
In this type of pickup drive mechanism, a lead screw, a main shaft (guide shaft) and a sub shaft (guide shaft) arranged in parallel with the lead screw, and supported by the main shaft and the sub shaft so as to be movable in the axial direction, the lead A gear portion that meshes with a screw and a carriage having an elastic body that urges the gear portion toward the lead screw and that ensures a good meshing state between the lead screw and the gear portion of the carriage has been proposed. (See Patent Document 2).

WO / 2001/091119 JP 2003-36615 A

However, in the above-described conventional configuration, since the meshing between the gear portion and the lead screw is difficult to disengage, an impact in the direction from the secondary shaft to the main shaft is applied to the disk device, and a load such as a pickup is applied only to the main shaft In some cases, the gear portion pushes up the lead screw due to momentary bending of the main shaft, and the lead screw may come off the bearing.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pickup drive mechanism and a disk device that solve the above-described problems of the prior art and reduce the load on the lead screw.

In order to solve the above problems, the present invention includes a lead screw, a guide shaft disposed in parallel with the lead screw, and a gear portion that is supported by the guide shaft so as to be movable in the axial direction and meshes with the lead screw. In a pickup driving mechanism equipped with a carriage and a recording medium pickup mounted on the carriage, a frame is disposed along the axial direction of the lead screw, and abuts on the frame, and the gear portion is on the lead screw side. The carriage is provided with a stopper for restricting movement to the carriage.
According to the above configuration, since the carriage is provided with the stopper that restricts the movement of the gear portion toward the lead screw, the gear portion does not excessively advance toward the lead screw, so the load on the lead screw can be reduced.

In the above configuration, the stopper may be formed integrally with the carriage.
According to the above configuration, since the stopper moves integrally with the carriage, it can function as a stopper by contacting the frame regardless of the position of the carriage.

In the above configuration, a gap may be formed between the stopper and the frame in a state where the movement of the gear portion toward the lead screw is less than a predetermined amount.
According to the above configuration, when the movement of the gear portion toward the lead screw is less than the predetermined amount, a gap is formed between the stopper and the frame, so that the carriage can move without any problem in the axial direction.

In the above configuration, the gear portion includes a fixed tooth fixed to the carriage and a movable tooth biased toward the lead screw, and the stopper has a predetermined amount of the fixed tooth toward the lead screw. You may contact | abut to the said frame when moving above.
According to the above configuration, since the stopper contacts the frame when the fixed tooth moves to the lead screw side by a predetermined amount or more, the fixed tooth does not excessively advance to the lead screw side, so the load on the lead screw can be reduced. . Further, since the gear portion includes a fixed tooth fixed to the carriage and a movable tooth that is biased toward the lead screw, the meshing between the fixed tooth and the lead screw cannot be disengaged. Compared with the case where it comprises, it is not necessary to urge a movable tooth toward a lead screw strongly, and the resistance at the time of a carriage moving to an axial direction can be reduced.

The present invention includes a drive unit that rotates a disk, a pickup that reads a signal from the rotated disk, and a pickup drive mechanism that slides a carriage on which the pickup is mounted in the radial direction of the disk. A lead screw arranged along the radial direction of the disk, a guide shaft arranged parallel to the lead screw, and a gear portion that is supported by the guide shaft so as to be movable in the axial direction and meshes with the lead screw. A carriage is provided along the axial direction of the lead screw, and a stopper is provided on the carriage that contacts the frame and restricts the movement of the gear portion toward the lead screw. It is characterized by.
According to the above configuration, since the carriage is provided with the stopper that restricts the movement of the gear portion toward the lead screw, the gear portion does not excessively advance toward the lead screw, so the load on the lead screw can be reduced.

In the above configuration, the stopper may be formed integrally with the carriage.
According to the above configuration, since the stopper moves integrally with the carriage, it can function as a stopper by contacting the frame regardless of the position of the carriage.

In the above configuration, a gap may be formed between the stopper and the frame in a state where the movement of the gear portion toward the lead screw is less than a predetermined amount.
According to the above configuration, when the movement of the gear portion toward the lead screw is less than the predetermined amount, a gap is formed between the stopper and the frame, so that the carriage can move without any problem in the axial direction.

In the above configuration, the gear portion includes a fixed tooth fixed to the carriage and a movable tooth biased toward the lead screw, and the stopper has a predetermined amount of the fixed tooth toward the lead screw. You may contact | abut to the said frame when moving above.
According to the above configuration, since the stopper contacts the frame when the fixed tooth moves to the lead screw side by a predetermined amount or more, the fixed tooth does not excessively advance to the lead screw side, so the load on the lead screw can be reduced. . In addition, since the gear portion includes a fixed tooth fixed to the carriage and a movable tooth that is biased toward the lead screw, the fixed tooth cannot be disengaged. Compared to the above, it is not necessary to urge the movable teeth toward the lead screw, and the resistance when the carriage moves in the axial direction can be reduced.

  According to the present invention, since the carriage is provided with the stopper for restricting the movement of the gear portion toward the lead screw, the gear portion does not excessively advance toward the lead screw, so that the load on the lead screw can be reduced.

1 is a perspective view showing an external appearance of a disc player according to the present invention. It is the perspective view which removed the upper chassis. It is a perspective view of a lower chassis. It is the perspective view of the left view which attached the drive unit to the lower chassis. It is the perspective view of the right view which attached the drive unit to the lower chassis. It is a perspective view which shows a base plate from upper direction. It is a perspective view which shows a base plate from the downward direction. It is a perspective view which shows a rack member from upper direction. It is a perspective view which shows a rack member from the downward direction. It is a figure which expands and shows the rack member of FIG. It is sectional drawing which shows the relationship between the rack member and a lead screw in the normal time. It is sectional drawing which shows the relationship between the rack member at the time of an impact, and a lead screw. It is the perspective view which looked at the clamp plate from the lower surface. It is the perspective view which looked at the clamp plate from the upper surface. It is a perspective view showing operation of a turn plate and a selector plate when a 12 cm diameter disk is inserted. It is a figure which shows operation | movement of the guide arm at the time of inserting the 12-cm diameter disc. It is a perspective view which shows operation | movement of a turn plate and a selector plate at the time of inserting an 8 cm diameter disc. It is a figure which shows operation | movement of the guide arm at the time of inserting the 8 cm diameter disc.

Preferred embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an external appearance of a disc player (disc device) according to an embodiment of the present invention. In this disc player, a recording medium disc having a different size such as a diameter of 8 cm or a diameter of 12 cm, such as a CD or a DVD, is drawn, and information recorded on the disc is reproduced. Reference numeral 1 denotes a main body, and the main body 1 includes a chassis 3 made of sheet metal. The chassis 3 includes a lower chassis 5 and an upper chassis 7 that covers the upper portion of the lower chassis 5, and a loading mechanism for loading a disc, which is not shown in FIG. A clamp mechanism for clamping the disc, a drive mechanism for driving the clamped disc, and the like are provided.

  2 is a perspective view with the upper chassis 7 removed, FIG. 3 is a perspective view of the lower chassis 5, and FIG. 4 is a left side perspective view in which the drive unit 9 is attached to the lower chassis 5. FIG. 5 is a right-side perspective view in which the drive unit 9 is attached to the lower chassis 5.

The lower chassis 5 is formed in a frame shape as shown in FIG. 3, and three vibration isolation structures 11 having dampers and springs are attached to the lower chassis 5. As shown in FIG. 2, a drive unit 9 as a clamp mechanism in which a clamp mechanism and a drive mechanism are integrated is placed and supported in a floating manner.
As shown in FIGS. 4 and 5, the drive unit 9 is connected to the base plate 13 on both sides of the rear end portion of the base plate 13 by hinges 15 and is spring-biased in a direction to close the tip 17A. And a clamp plate 17 that cooperates to clamp the disc. A rotating plate 19 is supported on the tip 17A of the clamp plate 17, and a turntable 21 including a magnet facing the rotating plate 19 is supported on the base plate 13. Then, as will be described later, when the disc is inserted and the clamp plate 17 is closed, the disc is rotatable by being clamped (clamped) by the rotary plate 19 at the tip 17A and the turntable 21 with magnet.

As shown in FIG. 1, a horizontally long disk insertion slot 23 is formed in the front surface of the main body 1, and at the back of the insertion slot 23 is a motor 24 at the front of the lower chassis 5 as shown in FIG. 2. A loading roller 25 to be driven is provided.
The loading roller 25 is driven by the motor 24 when the insertion of the disc into the insertion slot 23 is detected, and draws the disc into the main body 1. The loading roller 25 is supported by a roller plate 27, and the base of the roller plate 27 is connected to the lower chassis 5 by a hinge pin 28. Therefore, the loading roller 25 is configured to be disengaged from the disk by displacing its height position by swinging the roller plate 27 around the hinge pin 28. Further, the roller plate 27 is biased in a direction of lifting the loading roller 25 by lowering the front end of the roller plate 27 by a spring (not shown).

A trigger plate 31 is swingably supported via a support pin 30 on the left rear portion of the upper surface of the drive unit 9. The trigger plate 31 is in contact with a disk drawn into the main body 1 and clamps the disk to the drive unit 9. The trigger plate 31 is urged clockwise by a spring 31S, and two claw portions 32 and 33 bent inward of the drive unit 9 are integrally formed on one end 31A side thereof. . One of the claw portions 32 can be brought into contact with the drawn-in 8 cm disc, and the other claw portion 33 can be brought into contact with the drawn-in 12 cm disc.
The other end 31 </ b> B of the trigger plate 31 extends to the outside of the drive unit 9 and is bent downward along the outer wall of the drive unit 9. The other end 31 </ b> B contacts the rear surface 35 </ b> K of the trigger 35 disposed in the lower chassis 5. Then, when the disc is drawn into the main body 1 and abuts against one of the claws 32 and 33 and the trigger plate 31 rotates counterclockwise, the trigger plate 31 advances the trigger 35 (in the direction of arrow X). Let As shown in FIG. 4, the trigger 35 is normally biased toward the other end 31 </ b> B (in the direction of arrow Y) by a spring 34.

  A part of the trigger 35 extends forward from the bottom of the lower chassis 5, and a trigger rack gear 35A is integrally formed on the upper surface of the extension. A final gear 37 supported by the side plate 5A (see FIG. 2) of the lower chassis 5 is disposed in front of the trigger rack gear 35A. The final gear 37 is supported at a position where it does not mesh with the trigger rack gear 35A at normal times, and meshes with the trigger rack gear 35A only when the trigger plate 31 rotates counterclockwise and the trigger 35 moves forward. As shown in FIG. 2, the final gear 37 is connected to the motor 24 at the front of the lower chassis 5 via a gear train 38 composed of a plurality of gears. When the motor 24 is driven, the trigger rack gear 35A is connected. Once the final gear 37 and the final gear 37 are engaged with each other, the trigger 35 is advanced by the driving force of the final gear 37 and the motor 24 thereafter.

As shown in FIG. 4, a trigger cam 41 is integrally connected to the trigger 35. The trigger cam 41 extends inside the gear wheel train 38 (see FIG. 2) in parallel with the gear wheel train 38, and a cam surface 41A that gradually rises in a stepwise manner on the middle upper surface. Formed at the tip thereof is a step-like inclined groove 41B that rises forward to guide the drive shaft 25A (see FIG. 2) of the loading roller 25. A part 17B of the clamp plate 17 of the drive unit 9 is in contact with the cam surface 41A.
After the trigger 35 meshes with the final gear 37 and moves to the stroke end, the trigger cam 41 is pushed out, the rack of the trigger cam 41 meshes with the final gear 37, and the trigger cam 41 moves forward (in the direction of arrow X).

  When the trigger cam 41 moves forward (in the direction of the arrow X), the cam surface 41A with which the part 17B comes into contact gradually decreases, and the clamp plate 17 swings in the closing direction by a spring force, and further advances. When the trigger cam 41 moves to the forward limit position, the part 17B is completely separated from the cam surface 41A, and the disc clamping by the rotary plate 19 at the tip of the clamp plate 17 and the turntable 21 is completed. At the same time, the drive unit 9 is completely floating supported via the three vibration-proof structures 11 by releasing the engagement between the part 17B of the clamp plate 17 and the cam surface 41A. At the same time, the drive shaft 25A of the loading roller 25 moves to a low position along the inclined groove 41B, and the loading roller 25 is displaced low by the rocking of the roller plate 27. Move away from the bottom of the disc. In this state, the turntable 21 is rotated to reproduce the disc.

  When the motor 24 is rotated in the reverse direction, the trigger 35 and the trigger cam 41 move backward (in the direction of arrow Y) via the gear wheel train 38, the final gear 37, and the trigger rack gear 35A. Along with this, the cam surface 41A with which the part 17B abuts gradually increases, and the clamp plate 17 is pushed up against the spring force and swings in the opening direction. When the trigger cam 41 further moves backward and moves to the retreat limit position, a part 17B rides on the highest position of the cam surface 41A, and the disc is located between the rotary plate 19 at the tip of the clamp plate 17 and the turntable 21. A gap for insertion is formed.

At the same time, the drive shaft 25A of the loading roller 25 gradually moves to a higher position along the inclined groove 41B, and the loading roller 25 comes into contact with the lower surface of the disk by the swing of the roller plate 27 at the retreat limit position. Displace high until Then, the disc is ejected by the loading roller 25.
After ejecting the disc, it is in a waiting state for loading. In the eject or loading standby state, the drive unit 9 is locked to the chassis 3 by a mechanism not shown.

FIG. 6 is a perspective view showing the base plate 13 from above, and FIG. 7 is a perspective view showing the base plate 13 from below.
As shown in FIG. 6, an opening M is formed in the base plate 13, and a pickup driving mechanism 110 for moving the pickup 108 in the radial direction of the disk (P direction in the figure) is arranged in the opening M. Yes. The pickup driving mechanism 110 includes a lead screw 111 provided along the radial direction of the disk, a main shaft (guide shaft) 112 and a sub shaft (guide shaft) 113 disposed substantially parallel to the lead screw 111, and these A pickup optical component support member 114 is provided between the shafts 112 and 113 and is slidable along the axial direction of the shafts 112 and 113 by the rotation of the lead screw 111.

  As shown in FIGS. 6 and 7, a motor 116 such as a stepping motor that rotates the lead screw 111 is directly connected to one end of the lead screw 111. The other end of the lead screw 111 is rotatably supported by a bearing portion 118 formed at the tip of a frame 117 coupled to the motor 116. The frame 117 is attached to the base plate 13 and extends below the lead screw 111 along the axial direction of the lead screw 111. Thus, by providing the frame 117 along the axial direction of the lead screw 111, the rigidity of the base plate 13 is increased, and the lead screw 111 and the motor 116 can be supported more firmly. The shafts 112 and 113 are supported by bearing portions 112A and 113A formed on the lower surface side of the base plate 13, respectively.

The pickup optical component support member 114 includes a base portion 114A on which the pickup 108 is mounted, and a first bearing portion 114B having an insertion hole 120 through which the main shaft 112 is inserted is provided on one end side of the base portion 114A. On the other end side of the base portion 114A, a second bearing portion 114C formed on a substantially U-shaped cross section engaged with the auxiliary shaft 113 is provided.
A rack member 115 is disposed on the first bearing portion 114B of the pickup optical component support member 114, and the rack member 115 is fixed to the first bearing portion 114B by screws 122.

FIG. 8 is a perspective view showing the rack member 115 from above, and FIG. 9 is a perspective view showing the rack member 115 from below.
As shown in FIGS. 6 and 8, the rack member 115 includes a resin rack member main body 115A and a protruding portion 115B protruding from the front side (the lead screw 111 side) of the rack member main body 115A to the lead screw 111. I have. A movable portion 115 </ b> C that is movable toward the lead screw 111 is disposed on the front surface side of the protruding portion 115 </ b> B. As shown in FIG. 9, the lower end portion 115 </ b> D of the movable portion 115 </ b> D is connected to the projecting portion 115 </ b> B and is configured to be tiltable toward the lead screw 111. That is, the rack member 115 includes a rack member main body 115A, a protruding portion 115B, and a movable portion 115C, and is integrally formed of resin.

As shown in FIG. 8, a space Q is formed between the rack member main body 115A and the movable portion 115C, and the coil for urging the movable portion 115C toward the lead screw 111 (see FIG. 6) in this space Q. A spring 119 is received. One end 119A of the coil spring 119 is configured to contact the front surface 115E of the rack member main body 115A forming the space Q, and the other end 119B is configured to contact the back surface 115F of the movable portion 115C.
The protruding portion 115B is formed with a restricting portion 115G extending from one end side of the protruding portion 115B, and the movable portion 115C is formed with an extending portion 115H with which the restricting portion 115G abuts. When the movable portion 115C is inclined through the lower end portion 115D (see FIG. 9), the extending portion 115H comes into contact with the restricting portion 115G, whereby the inclination angle of the movable portion 115C is restricted.

  A first protrusion 131 that meshes with the lead screw 111 is formed on the movable portion 115C. In addition, two second protrusions 132 and 132 sandwiching the first protrusion 131 are formed on the front surface of the protrusion 115B. In this configuration, the first protrusion 131 formed on the movable portion 115C functions as a movable tooth, and the second protrusions 132 and 132 formed on the protrusion 115B function as fixed teeth. Further, the first protrusion 131 and the second protrusions 132 and 132 constitute a gear part 130.

  As shown in FIG. 6, when the lead screw 111 is driven to rotate by the motor 116, the gear portion 130 provided on the rack member 115 meshes with the lead screw 111, so that the pickup optical component support member 114 has shafts 112 and 113. It moves along the axial direction. As a result, the pickup 108 moves in the radial direction of the disk (P direction in the figure). Since the gear part 130 is comprised by the movable tooth 131 and the fixed tooth 132, even if the meshing of the movable tooth 131 and the lead screw 111 comes off, the meshing of the fixed tooth 132 and the lead screw 111 does not come off. That is, it is not necessary to urge the movable teeth 131 strongly toward the lead screw 111 as compared with the case where the gear portion is composed of only the movable teeth, so that the resistance when the rack member 115 moves in the axial direction can be reduced.

FIG. 10 is an enlarged view of the rack member 115 shown in FIG. FIG. 11 is a cross-sectional view showing the relationship between the rack member 115 and the lead screw 111 during normal operation, and FIG. 12 is a cross-sectional view showing the relationship between the rack member 115 and the lead screw 111 during impact.
As shown in FIGS. 7 and 11, the frame 117 includes an upper plate 117 </ b> A extending in parallel with the side portion of the lead screw 111, and the upper plate 117 </ b> A is fixed to the base plate 13 with screws 14. The frame 117 includes a vertical plate 117B extending downward from the upper plate 117A, and a lower plate 117C extending from the vertical plate 117B to the lower side of the lead screw 111. That is, the frame 117 extends in an L shape from the upper plate 117A so as to surround one side portion and the lower portion of the lead screw 111, and its end surface 117D is inside the side end portion 111A of the lead screw 111 (in FIG. 11, It is located on the left side.

  As shown in FIGS. 10 and 11, a stopper 140 is formed integrally with the protruding portion 115 </ b> B below the gear portion 130 (upward in the drawing). The stopper 140 projects from the lower end portion of the projecting portion 115 </ b> B to the front surface side from the fixed tooth 132, and extends toward the end surface 117 </ b> D of the frame 117. The front surface 140A of the stopper 140 is formed in a planar shape and in parallel with the planar end surface 117D of the frame 117, and the front surface 140A of the stopper 140 faces the end surface 117D of the frame 117. This stopper 140 is provided over the width direction of the protrusion 115B (the axial direction of the lead screw 111).

  When the movement of the gear part 130 toward the lead screw 111 is less than a predetermined amount, a gap δ is formed between the stopper 140 and the frame 117. Because the gap δ does not generate a frictional force between the stopper 140 and the frame 117, the movement of the pickup optical component support member 114 in the axial direction is not hindered. Here, the predetermined amount is, for example, a moving amount such that the fixed tooth 132 does not contact the shaft 111B of the lead screw 111 and push up the lead screw 111. Note that a state in which the movement of the gear unit 130 toward the lead screw 111 is less than a predetermined amount is a normal time.

  Further, even if the movable teeth 131 (see FIG. 6) and the lead screw 111 are disengaged due to impact or the like, the stopper 140 and the frame are not moved when the movement of the fixed teeth 132 toward the lead screw 111 is less than a predetermined amount. There is a gap δ with respect to 117. Therefore, since the stopper 140 does not contact the frame 117, the pickup optical component support member 114 can move without any problem in the axial direction. That is, the stopper 140 does not hinder the movement of the pickup optical component support member 114 in the axial direction to the position just before the fixed teeth 132 push up the lead screw 111.

  On the other hand, as shown in FIG. 12, when a force in the direction (F direction in the figure) from the secondary shaft 113 (see FIG. 7) to the main shaft 112 is applied to the disc player by an impact or the like, due to an instantaneous deflection of the main shaft 112 or the like. The rack member 115 moves to the lead screw 111 side. At this time, when the fixed tooth 132 moves to the lead screw 111 side by a predetermined amount or more, the front surface 140A of the stopper 140 contacts the end surface 117D of the frame 117. Thus, the stopper 140 contacts the frame 117 before the fixed tooth 132 contacts the shaft 111B of the lead screw 111 and pushes up the lead screw 111, so that the lead screw 111 and the gear portion 130 are engaged. In addition, the lead screw 111 can be prevented from falling off the bearing portion 118.

  When the stopper 140 abuts on the frame 117, the load concentrated only on the main shaft 112 is distributed to the frame 117 via the stopper 140, so that the load on the main shaft 112 can be reduced. Since the stopper 140 contacts the planar end surface 117D of the frame 117 on the planar front surface 140A, the stopper 140 and the frame 117 can contact each other over a wide area, and the load on the stopper 140 and the frame 117 can be reduced. Since the front surface 140A of the stopper 140 and the end surface 117D of the frame 117 abut against each other in parallel, the generation of torque due to the contact between the stopper 140 and the frame 117 can be suppressed. Moreover, since the stopper 140 is provided over the width direction of the protrusion 115B, it is possible to secure a wider contact area between the stopper 140 and the frame 117 and further reduce the load on the stopper 140 and the frame 117.

Since the stopper 140 is integrally formed with the rack member 115 of the pickup optical component support member 114, the stopper 140 moves integrally with the pickup optical component support member 114 so that the pickup optical component support member 114 is located at any position on the main shaft 112. Can contact the frame 117 and can function as a stopper. Further, by integrating the stopper 140 with the rack member 115, the number of parts can be reduced and the manufacturing process can be simplified.
Since the stopper 140 is provided by effectively using the space between the protrusion 115B and the frame 117, the pickup drive mechanism 110 can be prevented from being enlarged. Furthermore, since the stopper 140 is configured to extend toward the end surface 117D of the frame 117 extending along the axial direction of the lead screw 111 and abut against the end surface 117D of the frame 117, the abutment that abuts against the stopper 140. It is not necessary to provide a separate portion, and the structure of the pickup drive mechanism 110 can be simplified.

Next, a mechanism for guiding the disk drawn into the main body 1 to the clamp position of the drive unit 9 will be described. FIG. 13 is a perspective view of the clamp plate 17 as viewed from the lower surface, and FIG. 14 is a perspective view of the clamp plate 17 as viewed from the upper surface.
As shown in FIG. 13, the clamp plate 17 is provided with a pair of guide arms 43 and 44 that abut against the outer periphery of the disk drawn into the main body 1 and guide the disk to the clamp position. The guide arms 43 and 44 are arranged so as to be substantially centered with respect to the rotary plate 19 at the tip of the clamp plate 17, and contact portions 43 </ b> A and 44 </ b> A that contact the disk are formed at the front ends of the guide arms 43 and 44. The Bearing portions 43B and 44B are formed at the rear ends of the guide arms 43 and 44, and these bearing portions 43B and 44B are loosely fitted to pins 45 and 46 extending downward from the clamp plate 17. The guide arms 43 and 44 are biased in the closing direction (direction of arrow A) by the springs 47 and 48. Further, as shown in FIG. 14, guide pins 43 </ b> C extending to the upper surface side of the clamp plate 17 are formed on the upper surfaces of the guide arms 43 and 44 through guide holes 49 and 50 (FIG. 13) formed in the clamp plate 17. , 44C are provided.

  In this configuration, as shown in FIG. 1, a turn plate 51 that abuts on the outer periphery of the disk to be inserted and retracts to the side of the insertion slot 23, and a slide plate 52 and a selector that are interlocked with the operation of the turn plate 51. Plate 53. The turn plate 51 and the slide plate 52 are disposed on the upper chassis 7, and the selector plate 53 is disposed on the clamp plate 17. The selector plate 53 is interlocked with the operation of the turn plate 51 when the disc is inserted, and engages or disengages with the guide pins 43C and 44C (see FIG. 14) of the guide arms 43 and 44, whereby the guide arms 43 and 44 are engaged. It functions as a restricting member that restricts the operation.

  The turn plate 51 is swingably connected to the upper surface of the left front portion of the upper chassis 7 via a pin 54 and is urged in a closing direction by a spring 55. A gate pin 56 facing the insertion port 23 is attached to the turn plate 51. Further, a substantially J-shaped guide hole 51A is formed at the base of the turn plate 51, and a pin 57 that fits into the guide hole 51A is attached to the slide plate 52. The slide plate 52 is formed with a pair of slide holes 52A and 52B extending in the disc insertion direction (the direction of the arrow Y), and a part of the upper chassis 7 is cut and raised in the slide holes 52A and 52B. The guide pieces 58 and 59 which are raised are fitted. The rear end 52 </ b> C of the slide plate 52 is folded forward and engaged with a connecting portion 53 </ b> A formed at one end of the selector plate 53.

As shown in FIG. 14, the selector plate 53 is swingably connected to the substantially central upper surface of the clamp plate 17 via a pin 60 and is urged clockwise by a spring 61. The selector plate 53 has a pair of guide holes 53B and 53C formed on the left and right sides of the pin 61, and a slide hole formed at one end on the side of the connecting portion 53A for restricting the operating range of the selector plate 53. 53D is formed. Guide pieces 62 and 63 extending above the clamp plate 17 are fitted into the guide holes 53B and 53C, and a regulation piece 64 extending above the clamp plate 17 is fitted into the slide hole 53D. .
The selector plate 53 is formed with engaging grooves 53E and 53F that engage with the guide pins 43C and 44C of the guide arms 43 and 44 in an initial state in which no disc is inserted into the main body. By engaging the engagement grooves 53E and 53F with the guide pins 43C and 44C, the operation of the guide arms 43 and 44 is restricted. Further, the engaging grooves 53E and 53F are opened on the urging direction (clockwise) side of the selector plate 53. When the selector plate 53 rotates counterclockwise, the guide pins 43C and 44C are engaged with the engaging grooves 53E. , 53F and the guide arms 43 and 44 can be operated.

When the disc is inserted into the insertion slot 23, the disc pushes the gate pin 56 of the turn plate 51 sideways. For example, when the disc 100 having a large diameter of 12 cm is inserted, as shown in FIG. 15, the outer peripheral portion 100A of the disc 100 pushes the gate pin 56 to the side of the insertion port 23 and the turn plate 51 opens (indicated by the arrow D). Direction). Along with this rotation, the pin 57 moves in the guide hole 51 </ b> A, thereby interlocking with the swing of the turn plate 51, and the slide plate 52 moves along the guide pieces 58 and 59 in front of the main body 1 ( Move in the direction of arrow X).
As the slide plate 52 moves, the connecting portion 53A of the selector plate 53 engaged with the slide plate 52 is pulled forward, so that the selector plate 53 is counterclockwise (in the direction of arrow E) against the spring 61. ). By this rotation, the guide pins 43C and 44C of the guide arms 43 and 44 (see FIG. 13) are disengaged from the engaging grooves 53E and 53F, so that the operation of the guide pins 43C and 44C becomes possible.
According to this, as shown in FIG. 16, the outer peripheral portion 100A of the disk 100 abuts against the abutting portions 43A and 44A of the guide arms 43 and 44, so that the guide arms 43 and 44 gradually move sideways (arrows). The disc 100 is guided to the clamp position by the guide arms 43 and 44.

FIG. 17 is a perspective view when the disc 200 having a small diameter of 8 cm is inserted. In this case, since the disc diameter is smaller than the width of the insertion port 23, there is a possibility that the disc is inserted biased to one end of the insertion port 23. For example, when the disc 200 is inserted while being biased toward the gate pin 56, the outer peripheral portion 200 </ b> A of the disc 200 pushes the gate pin 56 to the side of the insertion port 23, and the turn plate 51 opens (in the direction of arrow D). Move. Therefore, like the 12 cm diameter disk 100, the selector plate 53 rotates in conjunction with the operation of the turn plate 51, whereby the guide pins 43C and 44C of the guide arms 43 and 44 (see FIG. 13) are engaged. The guide pins 43C and 44C can be operated because they are separated from the mating grooves 53E and 53F. However, since the 8 cm diameter disc 200 has a smaller diameter than the 12 cm diameter disc, the turn plate 51 returns to the initial position by the biasing force of the spring 55 until the 8 cm diameter disc 200 reaches the clamp position. In conjunction with the operation of the turn plate 51, the selector plate 53 also returns to the initial position, so that the guide pins 43C and 44C of the guide arms 43 and 44 engage with the engaging grooves 53E and 53F of the selector plate 53, respectively. The operations of the arms 43 and 44 are restricted.
According to this, as shown in FIG. 18, since the guide arms 43 and 44 do not operate from the initial position, the outer peripheral portion 200A of the disc 200 comes into contact with the contact portions 43A and 44A of the guide arms 43 and 44. Thus, the disc 200 is guided to the clamp position.

  As described above, according to the present embodiment, the rack member 115 of the pickup optical component support member 114 is provided with the stopper 140 that restricts the movement of the gear portion 130 toward the lead screw 111, so that the gear Since the part 130 does not advance excessively to the lead screw 111 side, the load on the lead screw 111 can be reduced.

  Further, according to the present embodiment, since the stopper 140 is integrally formed with the rack member 115 of the pickup optical component support member 114, the stopper 140 moves integrally with the pickup optical component support member 114. The pickup optical component support member 114 can function as a stopper by contacting the frame 117 at any position.

  Further, according to the present embodiment, when the movement of the gear portion 130 toward the lead screw 111 is less than a predetermined amount, the gap δ is formed between the stopper 140 and the frame 117, so that the pickup optical component The support member 114 can move in the axial direction without hindrance.

  Furthermore, according to the present embodiment, the stopper 140 contacts the frame 117 when the fixed tooth 132 moves to the lead screw 111 side by a predetermined amount or more, so the fixed tooth 132 does not excessively advance to the lead screw 111 side. Therefore, the load on the lead screw 111 can be reduced. Further, since the gear portion 130 includes the fixed teeth 132 fixed to the rack member 115 and the movable teeth 131 that are biased toward the lead screw 111, the engagement between the movable teeth 131 and the lead screw 111 is released. However, since the meshing between the fixed tooth 132 and the lead screw 111 is not disengaged, it is not necessary to strongly bias the movable tooth 131 toward the lead screw 111 as compared with the case where the gear portion is composed of only the movable teeth, and the pickup optical component The resistance when the support member 114 moves in the axial direction can be reduced.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, although the stopper 140 is provided over the width direction of the protrusion 115B, the stopper may be provided only at a part of the protrusion 115B by narrowing the width of the stopper. In this case, the width of the stopper is desirably set to a width that can suppress the generation of torque due to contact between the stopper and the frame.

In the above embodiment, the rack member 115 is made of resin, but may be made of metal.
Further, in the above embodiment, the carriage driving mechanism is applied to the mechanism for driving the pickup of the disc player. However, the present invention is not limited to this. For example, this driving mechanism is applied to the mechanism for driving the printer head. It can also be applied to a mechanism for driving a movable lens such as a zoom lens or a focus lens of a camera.

9 Drive unit 108 Pickup 110 Pickup drive mechanism 111 Lead screw 112 Main shaft (guide shaft)
113 Secondary shaft (guide shaft)
114 Pickup optical component support member (carriage)
130 Gear portion 117 Frame 131 Movable teeth 132 Fixed teeth 140 Stopper δ Clearance

Claims (8)

A lead screw, a guide shaft arranged in parallel with the lead screw, a carriage having a gear portion which is supported by the guide shaft so as to be movable in the axial direction and meshes with the lead screw, and a recording mounted on the carriage In a pickup drive mechanism comprising a medium pickup,
A pickup driving mechanism, wherein a frame is disposed along the axial direction of the lead screw, and a stopper is provided on the carriage to contact the frame and restrict movement of the gear portion toward the lead screw.   The pickup driving mechanism according to claim 1, wherein the stopper is formed integrally with the carriage.   3. The pickup driving mechanism according to claim 1, wherein a gap is formed between the stopper and the frame when the movement of the gear portion toward the lead screw is less than a predetermined amount. .   The gear portion includes fixed teeth fixed to the carriage and movable teeth urged toward the lead screw, and the stopper is configured to move the fixed teeth toward the lead screw by a predetermined amount or more. The pickup driving mechanism according to claim 1, wherein the pickup driving mechanism is in contact with the frame. A drive unit that rotates the disk, a pickup that reads a signal from the rotated disk, and a pickup drive mechanism that slides a carriage on which the pickup is mounted in the radial direction of the disk,
The pick-up drive mechanism is supported by a lead screw disposed along the radial direction of the disk, a guide shaft disposed in parallel with the lead screw, and movably supported in the axial direction on the guide shaft. The carriage having a gear portion meshing with the carriage,
2. A disk device according to claim 1, wherein a frame is disposed along the axial direction of the lead screw, and a stopper is provided on the carriage for contacting the frame and restricting movement of the gear portion toward the lead screw.   6. The disk device according to claim 5, wherein the stopper is formed integrally with the carriage.   7. The disk device according to claim 5, wherein a gap is formed between the stopper and the frame in a state where the movement of the gear portion toward the lead screw is less than a predetermined amount.   The gear portion includes fixed teeth fixed to the carriage and movable teeth urged toward the lead screw, and the stopper is configured to move the fixed teeth toward the lead screw by a predetermined amount or more. The disk device according to claim 5, wherein the disk device is in contact with the frame.

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