JP4190408B2 - Disk unit - Google Patents

Description

  The present invention relates to a disk device that transfers a head by meshing a pinion gear and a rack member, and in particular, when a moving force is further applied from the pinion gear to the rack member after the head has moved to the end of movement. The present invention relates to a disk device that can prevent the disk from being locked.

  In Patent Document 1 below, a rack is provided in a moving unit on which an optical head is mounted, and a moving force is applied to the rack from a pinion gear, so that the moving unit moves in the inner and outer circumferential directions of the disk. A disk device is disclosed.

In this type of disk device, the moving area of the head is between the position facing the inner circumference side of the disk from which TOC information can be read and the end of the data recording area on the outer circumference side. The device described in Patent Document 1 is provided with a detection switch that detects this and stops the motor when the moving unit on which the head is mounted reaches the moving end in the inner circumferential direction.
JP 2000-173205 A

  In the disk device described in Patent Document 1, when the moving part is moved to the inner end of the disk by the rotation of the pinion gear, the motor is stopped by the detection of the detection switch, and the rack is moved from the pinion gear to the rack. Transmission of moving force to is stopped.

  On the other hand, the movement position of the head in the outer circumferential direction of the disk is controlled based on the TOC information and the data actually read from the disk by the head. That is, when the head moves in the outer circumferential direction of the disk and moves out of the data area, the motor is stopped by a command from a control unit mainly composed of the CPU.

  Therefore, if the motor continues to operate due to a malfunction of the program in the control unit, etc., even though the head has reached the outer peripheral position that is out of the data area, the rack and the pinion gear remain engaged with each other. As a result, the drive current continues to flow in the motor coil, and the motor coil may be damaged. Further, the mechanism may be excessively worn or damaged in the power transmission path from the motor to the rack.

  The present invention solves the above-described conventional problems, and provides a disk device capable of releasing the engagement between a rack member and a pinion gear when power is applied to the motor after the head reaches the end of movement. The purpose is to do.

The present invention includes a rotary drive unit for holding and rotating a disk, a head for performing at least one of the signal recording and reproduction with respect to disk, and a guide member for guiding the head to the inner circumferential direction and the outer circumferential direction of the disk And a disk device having a rack member that moves together with the head, and a pinion gear that applies a moving force to the rack member.
The rack member is provided so as to be rotatable about an axis extending in the moving direction with respect to the head, and the rack member is rotated in a direction in which the teeth of the rack member mesh with the teeth of the pinion gear. A biasing member for biasing is provided,
At least one of the teeth of the pinion gear and the teeth of the rack member is formed obliquely with respect to the direction of the rotation center line of the pinion gear,
After the head moves in the first direction which is either the inner circumferential direction or the outer circumferential direction of the disk and reaches the first moving end, the rotational force of the pinion gear is applied to the rack member. when given in a direction to continue the movement in the first direction, the inclination of the teeth, the rack member is rotated to a position where the engagement is disengaged with the pinion gear,
After the head moves in the second direction opposite to the first direction and stops at the second moving end, the pinion gear further rotates to cause the rack member to move in the second direction. A mesh release means is provided for releasing the rack member from mesh with the pinion gear when a moving force is applied.

  In this disk device, when the power of the motor continues to be transmitted to the pinion gear due to a malfunction of the control circuit after the head reaches the first moving end, the rack member is caused by the component force acting on the inclined teeth. Is rotated to a position where it is disengaged from the pinion gear. Therefore, it is possible to prevent the mechanism from being locked while the rack member and the pinion gear are engaged with each other.

  For example, when the head moves to the outer peripheral side, the rack member and the pinion gear are disengaged due to the inclination of the teeth, and when the head moves to the inner peripheral side, the rack member and the pinion gear are disengaged by the mesh release means. This configuration prevents the rack member and pinion gear from locking in the meshed state even if the control circuit malfunctions both when the head moves to the outer peripheral side and when it moves to the inner peripheral side. become able to.

In the present invention, the head and the rack member are relatively movable in the moving direction of the head, and a biasing member that presses the rack member in the first direction against the head is provided. And
After the head reaches the second moving end and stops, when the pinion gear further rotates and the rack member is given a moving force in the second direction, the rack member It moves against the biasing force of the member and disengages from the pinion gear.

Further, when the rack member moves against the urging force of the urging member, the transmission member fitted to the rack member, the transmission member is moved, and the rack member is moved to the pinion gear. It is preferable that a switching member for holding the mesh at a position where the meshing is released is provided.

  In the present invention, even when the power of the motor continues to be transmitted to the pinion gear due to a malfunction of the control circuit or the like when the head reaches its end of movement, the head is locked when the rack member and the pinion gear are engaged with each other. Can be prevented.

  FIG. 1 is a perspective view of a drive base, showing a main part of a disk device according to an embodiment of the present invention. 2 is a bottom view in which the drive base shown in FIG. 1 is reversed left and right and the bottom surface is faced upward, and FIG. 3 is a cross-sectional view taken along line abcd in FIG. (A) (B) is explanatory drawing which shows the meshing state of a rack member and a pinion gear, FIG. 5 is an enlarged plan view which shows a mesh release means, FIG. 6 is a top view which shows the mesh release operation | movement by a mesh release means.

  The disk device 1 of this embodiment is for in-vehicle use, and performs signal recording and signal reproduction with respect to a disk such as an optical recording DVD or CD. As shown in FIG. 1, support pins 4, 4 are provided on both left and right sides of the drive base 11 in the x direction. By being supported in an elastically levitated state by a coil spring, an air-type or oil-type damper member, etc., it is possible to absorb vibration generated when the vehicle travels.

  As shown in FIG. 2, on the lower surface of the drive base 11, there is a motor M that transmits its power to a sled power transmission path for moving the optical head 31 and to a power transmission path of a conveyance roller 28 described later. Is provided.

  2, 5, and 6, which will be described below, illustrate various types of gears. Of the various types of gears, those that require description of meshing are illustrated in detail with respect to the shape of teeth, and particularly described. For the unnecessary gear, only the pitch circle is drawn, and the detailed structure is not shown.

  As shown in FIG. 1, a window 11 b is opened in the drive base 11. An optical head 31 is provided on the lower surface of the drive base 11, and an objective lens 31 a provided on the optical head 31 is exposed from the window 11 b toward the upper surface of the drive base 11. Inside the optical head 31, a light emitting element for applying laser light to the objective lens 31a, a light receiving element for receiving reflected return light from the disk D, and other optical elements are incorporated.

  As shown in FIG. 2, on the lower surface of the drive base 11, a guide shaft 32 and a guide portion 33 that are inclined and extend in both the x direction and the y direction are arranged in parallel to each other. On one side of the optical head 31, bearings 34a and 34b are formed at intervals in the moving direction, and the bearings 34a and 34b are slidably fitted on the guide shaft 32. . A bifurcated sliding portion 35 is formed on the other side portion of the optical head 31, and the sliding portion 35 is slidably fitted so as to sandwich the guide portion 33. Therefore, the optical head 31 is guided by the guide shaft 32 and the guide portion 33 and is movable in the inner circumferential direction Si and the outer circumferential direction So of the disk D. That is, the guide shaft 32 and the guide portion 33 function as guide means for guiding the optical head 31 in the inner circumferential direction Si and the outer circumferential direction So.

  As shown in FIG. 2, a detection switch SW is provided at the edge of the window 11b in the inner circumferential direction Si. A detection arm 31b protruding from the front surface in the inner circumferential direction Si is provided on the front surface in the inner circumferential direction Si of the optical head 31, and when the optical head 31 moves to the moving end in the inner circumferential direction Si, The detection arm 31b presses the actuator of the detection switch SW, and the detection switch SW is turned on. The detection signal at this time is output to a control unit (not shown) mainly including a CPU provided in the disk device 1. In the control unit, it is possible to grasp the position and operation state of the optical head 31 from the detection signal from the detection switch SW.

  A stopper is provided at the edge of the window 11b in the outer circumferential direction So to limit the movement in the outer circumferential direction So by contacting the optical head 31 when the optical head 31 reaches the movement end in the outer circumferential direction. (Not shown).

  The optical head 31 is provided with a rack member 36 so that it can move together. The rack member 36 has rack teeth 37 formed in a predetermined range in the longitudinal direction. Bearing portions 36 a and 36 b are formed in the rack member 36 at intervals in the moving direction of the optical head 31. One bearing portion 36 a is positioned between the bearing portion 34 a and the bearing portion 34 b of the optical head 31 and is slidably inserted on the guide shaft 32.

  A compression spring 38 that is an urging member is provided between the bearing portion 34 b of the optical head 31 and the bearing portion 36 a of the rack member 36, and the compression spring 38 is externally attached to the guide shaft 32. .

  As shown in FIG. 3, the compression spring 38 has one winding start end 38a hooked to a part of the optical head 31, and the other winding start end 38b hooked to a hooking portion 36d provided on the rack member 36. It is hanging. Therefore, in the disk device 1, a rotational biasing force F in the α1 direction around the axial center line of the guide shaft 32 extending in the moving direction of the optical head 31 acts on the rack member 36.

  The compression spring 38 is interposed between the bearing portion 36a and the bearing portion 34b in a state where the compression spring 38 is compressed from a free length in the longitudinal direction which is the moving direction of the optical head 31 (So-Si direction). The bearing 36a and the entire rack member 36 are biased in the outer peripheral direction So by the repulsive force.

  As shown in FIG. 2, the bearing portion 36a is brought into close contact with the bearing portion 34a by the elastic force of the compression spring 38, and the optical head 31 and the rack member 36 are integrated with each other in the radial direction of the disk (So-Si). Can be moved to.

  On the side of the rack member 36, a shaft 43 is fixed to the lower surface of the drive base 11, and the pinion gear 41 and the transmission gear 42 are supported on the shaft 43 so as to rotate together. In the disk drive mode shown in FIG. 2, the rack teeth 37 and the pinion gear 41 are engaged with each other. The pinion gear 41 and the transmission gear 42 are integrally formed of synthetic resin or the like, or formed separately and fixed to each other by means such as adhesion.

  As shown in FIG. 3, the transmission gear 42 has tooth tips on the tooth tip side and tooth roots on the tooth root side formed in the outer peripheral surface thereof extending in the z1-z2 direction. The spur gear extends in parallel with the axial direction of the shaft 43.

  On the other hand, the pinion gear 41 has an addendum 41a and an addendum 41b formed on the outer peripheral surface thereof inclined at a predetermined inclination angle θ with respect to the axial direction of the shaft 43. It is a helical gear. Alternatively, the addendum 41a and the tooth root 41b may be formed along a spiral locus centering on the axial direction, and a gear having teeth of such a spiral locus is a category of a helical gear. It is. In this embodiment, the addendum 41a and the tooth root 41b are inclined in the clockwise direction toward the z1 direction. On the other hand, the rack teeth 37 of the rack member 36 are flat teeth whose tooth ends and tooth roots extend linearly in the z1-z2 direction.

  As shown in FIG. 3, the rotational urging force F acting in the α1 direction acts on the meshing portion between the rack teeth 37 of the rack member 36 and the teeth of the pinion gear 41. The rack teeth 37 are pressed against the inclined teeth of the pinion gear 41 by the rotational urging force F, thereby eliminating the meshing backlash.

  4A and 4B show the meshed state of the rack teeth 37 and the teeth of the pinion gear 41, and are sectional views taken along the line IV-IV in FIG.

  As described above, the addendum 41a and the tooth root 41b are inclined so as to turn clockwise as they go in the Z1 direction. FIG. 4A shows a state in which the pinion gear 41 rotates in the clockwise direction and the driving force in the outer peripheral direction (So direction) acts on the rack member 46. At this time, a driving force f is applied obliquely upward from the teeth of the pinion gear 41 to the rack teeth 37, and the rack teeth 37 are pressed against the teeth of the pinion gear 41 by the rotational biasing force F. It has been. Since this rotational biasing force F is sufficiently larger than the driving force f, the rack member 36 is sent in the outer circumferential direction (So direction) by the rotational force of the pinion gear 41, and the optical head 31 is also moved along the outer circumference. Moved in the direction.

FIG. 4B shows a state in which the pinion gear 41 rotates counterclockwise and a driving force in the inner circumferential direction (Si direction) is acting on the rack member 36 . At this time, the acting direction of the oblique driving force f ′ applied from the teeth of the pinion gear 41 to the rack teeth 37 is the same as the acting direction of the rotational biasing force F.

Next, information recording or reproducing operation by the disk device 1 will be described.
In the disk device 1, when the disk D is rotated to reproduce or record information recorded on the disk D, the pinion gear 41 and the rack member 36 are engaged with each other as described above, and the motor M Power is transmitted to the pinion gear 41, and the rotational force of the pinion gear 41 acts on the rack member 36, and the rack member 36 and the optical head 31 are driven in the outer peripheral direction (So direction) and the inner peripheral direction (Si direction). It has come to be.

  When the objective lens 31a of the optical head 31 moves to the inner peripheral end of the information recording area of the disc D (the inner peripheral end of the TOC information recording area), the optical head 31 hits the inner peripheral side stopper and moves toward the inner peripheral side. At the end, the optical head 31 can no longer move in the Si direction. At this time, the detection switch SW is turned on by the detection arm 31b provided in the optical head 31. At this time, the rack member 36 is in mesh with the pinion gear 41. When the detection switch SW is turned on, the control circuit determines this and issues a stop command to the motor M. Therefore, in a normal recording or reproducing operation, the motor M is surely stopped when the optical head unit 31 reaches the inner peripheral side movement end.

  On the other hand, when the optical head 31 moves in the outer circumferential direction (So direction), the movement position is controlled based on information read from the disk D and TOC information read and stored in advance. When the objective lens 31a of the optical head 31 reaches the outermost peripheral end of the information recording area of the disk D, a stop command or a reverse rotation command is issued from the control circuit to the motor M by the control based on the information. That is, there is no detection switch for detecting that the optical head 31 reaches the movement end on the outer peripheral side, and the motor M is stopped or reversely rotated based on the control so that the optical head 31 is moved to the inner circumference. It will return to the moving end of the side.

  Therefore, in the case where the information reading error, the TOC information is erroneously recognized, or there is a malfunction in the execution of the program in the control circuit, the optical head 31 reaches the movement end in the outer peripheral direction and hits the stopper. When the motor cannot move in the direction So, a situation is assumed in which no stop command or reverse rotation command is issued to the motor M. In particular, when such a malfunction occurs in the search operation in which the optical head 31 is moving in the outer peripheral direction at a high speed, the optical head 31 suddenly hits the stopper in the outer peripheral direction, and the power from the motor M to the pinion gear 41 is increased. Problems arise such as the gears being damaged or the rack teeth 37 being damaged in the transmission path.

  However, in this embodiment, the tooth end 41a and the tooth root 41b of the pinion gear 41 are inclined in the direction shown in FIG. Therefore, when the above malfunction occurs, the rack member 36 moves in the α2 direction as indicated by a broken line in FIG. 3 due to the upward component force of the driving force f applied from the teeth of the pinion gear 41 to the rack teeth 37. The rack teeth 37 are removed from the pinion gear 41 by being rotated. Therefore, after the optical head 31 has moved to the outer peripheral end of movement and stopped, the pinion gear 41 can idle in the clockwise direction, and damage to the components in the power transmission path as described above can be prevented.

  Thus, in this disk apparatus 1, when the optical head 31 reaches the end of movement in the outer circumferential direction, the rack member 36 rotates in the α2 direction to disengage from the pinion gear 41, and the optical head 31 moves in the inner circumferential direction. When the motor M is moved, the motor M is controlled to stop by the detection of the detection switch SW. Therefore, regardless of whether the optical head 31 moves in the outer circumferential direction or the inner circumferential direction, the power of the motor M continues to be transmitted to the pinion gear 41 while the rack member 36 and the pinion gear 41 are engaged at the end of the movement. Can be prevented from occurring.

  Further, in the above embodiment, when the optical head 31 further moves to the moving end in the inner circumferential direction (Si direction) and the detection switch SW is turned on, the motor M continues to drive in the same direction. An engagement release means 30 for forcibly releasing the engagement between the rack member 36 and the pinion gear 41 is provided.

Hereinafter, the structure and operation of the mesh release means 30 will be described.
As shown in FIGS. 2 and 6, a shaft 44 is fixed to the lower surface of the drive base 11 at the side of the transmission gear 42, and the drive gear 45 and the sun gear 46 are integrated with the shaft 44. It is supported so that it can rotate. The sun gear 46 meshes with the transmission gear 42, and the drive gear 45 meshes with a worm gear 47 provided on the output shaft of the motor M fixed to the drive base 11. The sun gear 46 is in mesh with a planetary gear 63.

  In the state of FIG. 2, power is transmitted from the worm gear 47 to the pinion gear 41 through the drive gear 45, the sun gear 46, and the transmission gear 42, and power is transmitted from the pinion gear 41 to the rack teeth 37 of the rack member 36. Thus, the optical head 31 is moved together with the rack member 36 in the So-Si direction.

  A shaft 59 is fixed to the drive base 11, and an intermediate gear 61 and an intermediate gear 62 are supported on the shaft 59 so as to rotate together. In FIG. 2, since the planetary gear 63 is separated from the intermediate gear 61, the power of the motor M is transmitted only to the pinion gear 41. However, as shown in FIG. When the gear 63 meshes with the intermediate gear 61, the power of the motor M is transmitted not only to the pinion gear 41 but also to the intermediate gear 61. When power is transmitted to the intermediate gear 61, the rotational force of the intermediate gear 61 is further transmitted to the roller gear 28c as shown in FIG. 6, and the transport roller 28, which is a transport means for transporting the disk D, is rotationally driven. Become so.

  A fan-shaped switching member 65 is rotatably supported on the shaft 44, and a shaft 64 is fixed to the switching member 65, and the planetary gear 63 is rotatably supported on the shaft 64.

  As shown in FIGS. 2, 5, and 6, a shaft 67 is fixed between the movement path of the rack member 36 and the switching member 65, and the transmission member 68 is rotatably supported on the shaft 67. Has been. A transmission recess 68 a is formed at one end of the transmission member 68. The rack member 36 is integrally formed with a transmission convex portion 36c, and the transmission convex portion 36c can be fitted into the transmission concave portion 68a as the rack member 36 moves in the inner circumferential direction Si. Yes.

  As shown in FIG. 5, a cam portion 71 is formed on the switching member 65. The cam portion 71 is a cam groove or a cam hole, and a transmission shaft 69 fixed to the other end of the transmission member 68 is slidably inserted into the cam portion 71.

  A relay member 72 fixed to the drive base 11 is provided outside the switching member 65. In the relay member 72, two teeth that mesh with the teeth of the planetary gear 63 are formed toward the moving path of the planetary gear 63.

  A shaft 73 is fixed to the drive base 11, and a restraining member 74 is rotatably supported on the shaft 73. A hook 74 a is integrally formed at the left end of the restraining member 74, and the hook 74 a can be locked to the switching member 65 as shown in FIG. 6.

The operation of the mesh release means 30 will be described.
As described above, in the drive mode in which information is recorded on or reproduced from the disk D, the motor M is stopped when the optical head 31 moves to the inner peripheral side and the detection switch SW is turned on. At this time, the rack member 36 and the pinion gear 41 are engaged with each other. Accordingly, in the drive mode, when the detection switch SW is ON, the end point of the counterclockwise rotation of the pinion gear 41 is set as the end point, and the motor M is driven forward and backward within the range not reaching the end point. The head 31 can be reciprocated along the information recording surface of the disk D in the inner circumferential direction and the outer circumferential direction.

  When the optical head 31 is moved and information is recorded on or reproduced from the disk D, the transmission member 68 is rotated clockwise as shown in FIG. The transmission convex portion 36 c thus formed is separated from the transmission concave portion 68 a of the transmission member 68. Further, since the transmission member 68 is rotated in the clockwise direction, the switching member 65 is rotated in the counterclockwise direction by the transmission shaft 69 of the transmission member 68, and the planet provided on the switching member 65 is rotated. The gear 63 is separated from the intermediate gear 61. Therefore, the power of the motor M is transmitted only to the pinion gear 41 as described above.

  When the user performs the operation of ejecting the disk D, the mesh release means 30 further operates the motor M to forcibly rotate the pinion gear 41 counterclockwise when the detection switch SW is turned on. By moving, the meshing between the rack member 36 and the pinion gear 41 is released, and the power of the motor M can be transmitted to the transport roller 28.

  When the pinion gear 41 is further rotated counterclockwise by the motor M from the state of FIG. 2 in which the detection switch SW is turned on, the compression spring 38 contracts, and the optical head 31 moved to the moving end on the inner peripheral side is moved. Only the rack member 36 is moved in the Si direction from the position of FIG. 2 without moving.

  As shown in FIG. 5, the transmission convex portion 36 c provided on the rack member 36 enters the transmission concave portion 68 a of the transmission member 68, and the transmission member 68 is counterclockwise due to the moving force of the rack member 36 in the Si direction. Can be rotated. Then, the switching member 65 is rotated clockwise by the transmission shaft 69 of the transmission member 68. At this time, since the pinion gear 41 is rotating counterclockwise and the planetary gear 63 is also rotating counterclockwise, the planetary gear 63 is rotated when the switching member 65 is slightly rotated clockwise. Meshes with the relay member 72, and the planetary gear 63 meshes with the intermediate gear 61 as shown in FIG.

  By the operation in which the planetary gear 63 meshes with the relay member 72 and further meshes with the intermediate gear 61, the switching member 65 is further rotated in the clockwise direction, and the rotational force is transmitted to the transmission member 68 via the cam portion 71. 68 is further rotated counterclockwise. With this rotational force, the rack member 36 is pulled in the Si direction, and the rack teeth 37 are separated from the teeth of the pinion gear 41.

  Then, as shown in FIG. 6, the restraining member 74 rotates counterclockwise, and its hook portion 74a is locked to the switching member 65, and the switching member 65 is held without moving in the state of FIG.

  In the state of FIG. 6, the power of the motor M is applied to both the pinion gear 41 and the intermediate gear 61, but the power is not transmitted to the rack member 36 because the rack teeth 37 are separated from the pinion gear 41. On the other hand, since the power of the motor M is transmitted to the roller gear 28c via the intermediate gears 61 and 62, the forward / reverse rotation of the motor M is transmitted to the transport roller 28, and the transport roller 28 carries out and transports the disk D. Is possible.

  In order to shift to the disk drive mode shown in FIG. 2 again, the restraint member 74 is rotated clockwise in the state shown in FIG. What is necessary is just to rotate clockwise. As a result, the planetary gear 63 rotates clockwise, and the planetary gear 63 moves away from the intermediate gear 61 and meshes with the relay member 72 and then moves to the position shown in FIG. As a result, the switching member 65 is rotated counterclockwise, the transmission member 68 is rotated clockwise, the rack member 36 is moved in the So direction by the elastic force of the compression spring 38, and the transmission convex portion 36c is transmitted. Exit from the recess 68a. The rack teeth 37 mesh with the pinion gear 41.

  As described above, in the disk device 1, when the detection switch SW is turned on by the control operation of the control circuit, the motor M is further operated to rotate the pinion gear 41 counterclockwise, thereby The member 36 is separated from the pinion gear 41 so that power can be transmitted to the transport roller 28.

  Therefore, for example, when the detection switch SW is ON, it is assumed that the motor M performs an unexpected operation due to a malfunction of the program of the control circuit, and the driving force in the counterclockwise direction acts on the pinion gear 41. However, the rack member 36 is separated from the pinion gear 41 by the operation of the mesh release means 30. Therefore, after the optical head 31 is positioned at the movement end on the inner peripheral side, it is possible to prevent the mechanism from being locked due to the drive current being supplied to the motor M while the rack member 36 and the pinion gear 41 are engaged. Is possible.

  In this disk apparatus 1, when the optical head 31 reaches the end of movement in the outer circumferential direction, the rack member 36 is rotated in the α2 direction as shown in FIG. Can be prevented from occurring even if a malfunction occurs, and when the optical head 31 moves to the movement end on the inner peripheral side, both or at least one of the detection switch SW and the mesh release means 30 is prevented. Thus, the phenomenon that the motor M is energized while the rack member 36 and the pinion gear 41 are in the locked state can be prevented.

  Therefore, in the disk device 1, the detection switch SW can be eliminated.

  In the present invention, the inclination angle of the teeth of the pinion gear 41 may be opposite to that shown in FIGS. In this case, when the motor M is energized with the optical head 31 reaching the end of movement in the inner circumferential direction, the rack member 36 comes off the pinion gear 41 as shown by the broken line in FIG. . In this case, when the optical head 31 reaches the end of movement in the outer circumferential direction, the motor M may be stopped by detecting this with the detection switch.

  The pinion gear 41 may be a spur gear whose teeth are not inclined, and the rack teeth 37 of the rack member 36 may be inclined. Alternatively, both the rack teeth and the pinion gear teeth may be inclined in the same direction.

The perspective view which shows a drive base as a disk apparatus of embodiment of this invention, It is a bottom view of the disk drive base, showing the disk drive mode, Sectional drawing seen from the arrow direction when FIG. 2 is cut along the ab-cd line, (A) (B) is sectional drawing in the IV-IV line of FIG. Partial enlarged view showing the operation of the mesh release means, The bottom view which shows the state by which the meshing | engagement of the rack member and the pinion gear was cancelled | released,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disc apparatus 11 Drive base 28 Conveying roller 30 Engagement release means 31 Pickup 32 Guide shaft 33 Guide part 34a, 34b Bearing part 35 Sliding part 36 Rack member 36a, 36b Bearing part 36c Transmission convex part 37 Rack tooth 38 Compression spring (with) Force member)
41 pinion gear 41a tooth end 41b tooth base 46 sun gear 63 planetary gear 65 switching member 68 transmission member 68a transmission recess 69 transmission shaft 71 cam portion 72 relay member 74 restraining member 74a hook M motor Si inner circumferential direction So outer circumferential direction

Claims (3)

A rotation driving unit for holding and rotating a disk, a head for performing at least one of recording a signal of reproducing on disk, and a guide member for guiding the head to the inner circumferential direction and the outer circumferential direction of the disk, and the head In a disk device having a rack member that moves together and a pinion gear that applies a moving force to the rack member,
The rack member is provided so as to be rotatable about an axis extending in the moving direction with respect to the head, and the rack member is rotated in a direction in which the teeth of the rack member mesh with the teeth of the pinion gear. A biasing member for biasing is provided,
At least one of the teeth of the pinion gear and the teeth of the rack member is formed obliquely with respect to the direction of the rotation center line of the pinion gear,
After the head moves in the first direction which is either the inner circumferential direction or the outer circumferential direction of the disk and reaches the first movement end, the rotational force of the pinion gear is applied to the rack member. when given in a direction to continue the movement in the first direction, the inclination of the teeth, the rack member is rotated to a position where the engagement is disengaged with the pinion gear,
After the head moves in the second direction opposite to the first direction and reaches the second moving end and stops, the pinion gear further rotates to cause the rack member to move in the second direction. A disk drive comprising: a mesh release means for releasing the rack member from mesh with the pinion gear when a moving force is applied . The head and the rack member are relatively movable in the moving direction of the head, and a biasing member that presses the rack member in the first direction against the head is provided,
After the head reaches the second moving end and stops, when the pinion gear further rotates and a movement force in the second direction is applied to the rack member, the rack member is attached to the attachment member. The disk device according to claim 1, wherein the disk device moves against the urging force of the urging member and disengages from the pinion gear. When the rack member moves against the urging force of the urging member, the transmission member fitted to the rack member and the transmission member are moved so that the rack member meshes with the pinion gear. The disk device according to claim 2, further comprising a switching member for holding the released position.

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