JP2005063549A - Disk drive and its skew adjustment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk drive capable of carrying out a highly accurate skew adjustment by a simple constitution. <P>SOLUTION: A radial adjustment part 53 and a tangential adjustment part 59 are arranged on a base unit chassis of a stator substrate 27 of a spindle motor 29 as a skew adjustment mechanism, and an adjustment part 72 is arranged on a pickup sub-guide shaft 36. The skew adjustment is carried out in such a manner that an optical pickup 16 is moved to the side of a skew adjustment fulcrum 71 of the pickup sub-guide shaft 36 and the skew is adjusted in the radial and tangential directions by the radial adjustment part and the tangential adjustment part 59 so as to optimize values of a jitter, etc., and next, the optical pickup 16 is moved to the side of the skew adjustment part 72 of the pickup sub-guide shaft 36 and the skew is adjusted in the tangential direction at the adjustment part 72 of the pickup sub-guide shaft 36 so as to optimize the values of the jitter, etc. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a disk drive apparatus and a skew adjustment method thereof, and more particularly, a signal is transmitted by a disk while a pickup is moved in the radial direction of the disk by a pair of guide shafts substantially parallel to the radial direction of the disk and substantially parallel to each other. The present invention relates to a disk drive device that performs writing and / or reading and a skew adjustment method thereof.

  An optical disk player that uses an optical disk as a recording medium performs signal writing or reading by irradiating the surface of the optical disk with laser light while moving the optical pickup in the radial direction with respect to the rotating optical disk. Here, it is necessary that the optical axis of the laser light emitted from the objective lens is incident at substantially perpendicular angles with respect to the radial direction and the tangential direction of the disc. Here, the angle formed by the laser beam and the recording surface of the optical disk is called skew, and it is usually preferable that this angle is vertical. In some cases, the angle is slightly inclined with respect to the vertical angle due to aberration or the like.

  If the angle between the optical axis of the objective lens and the recording surface of the optical disk, that is, the skew is not appropriate, jitter occurs that causes the signal to swing with respect to the time axis, thereby causing an error in the writing operation or reading operation. Since jitter becomes a factor that impedes high-density recording, it is necessary to suppress the jitter to an appropriate value in order to perform high-density recording.

  Japanese Patent Application Laid-Open No. 2002-109819 discloses a spindle motor in which a turntable on which an optical disk is detachably mounted is fixed to a rotating shaft, a motor base plate on which the spindle motor is mounted, and the motor base plate. In a disk drive device including a base unit chassis on which a spindle motor is supported by screwing, a fixing portion for fixing one portion of the motor base plate to the base unit chassis, and two other portions of the motor base plate A height adjustment unit capable of height adjustment is provided, thereby fixing one part of the motor base plate to which the spindle motor is fixed and making it possible to adjust the height of one or more other parts, and tilting the motor base plate A disk drive device is disclosed in which the angle can be freely adjusted.

  Japanese Patent Application Laid-Open No. 11-66569 discloses a disk drive device that reads and / or writes information on a recording medium disk held and rotated by a turntable, and irradiates the recording medium disk with light. Two guide shafts for guiding the radial movement of the recording medium disk held on the turntable of the optical pickup for reading and / or writing information, and one end of the guide shaft can be adjusted to adjust the turn Positioned outside the outer peripheral edge of the recording medium disk held on the table, the adjustment end can be adjusted to be detachable from the extended surface of the recording medium disk, and the position of the adjustment end of the guide shaft is adjusted. The perpendicularity of the light irradiated from the optical pickup with respect to the information recording surface of the recording medium disk is adjusted. And, this disk drive device is disclosed that can be performed easily skew adjustment by.

  In the disk drive device disclosed in Japanese Patent Application Laid-Open No. 2002-109819, the skew adjustment in the radial direction and the tangential direction is performed only by the adjusting portion provided in the fixed portion of the spindle motor. It is necessary on the premise that the sub guide shafts are attached to the base unit chassis substantially parallel to each other. If these are not parallel, there will be a difference in tangential skew between the inner and outer circumferences of the disc, and when skew adjustment is performed with a jitter value closer to the inner circumference of the disc, the outer circumference of the disc will be If the jitter value is close, the tangential skew increases on the inner circumference side. For these reasons, there is a problem that the performance such as jitter deteriorates.

  Therefore, it is necessary to strictly follow the parallelism of the four support portions for attaching both ends of the pickup guide shaft of the base unit chassis and both ends of the pickup sub guide shaft, and the mold for molding the base unit chassis made of synthetic resin is required. It took time to follow up, and it was necessary to pay sufficient attention to the molding conditions and press conditions during mass production. In addition, the parallelism error that could not be driven by the above mold, and the performance of jitter, etc. deteriorate, so the equipment that requires a margin of performance such as jitter is used at high speed and low temperature, vibration The use under impact is limited. This hinders high performance and portability of the disk drive device.

  On the other hand, in the disk drive device disclosed in Japanese Patent Application Laid-Open No. 11-66569, the skew adjustment in the radial direction and the tangential direction is performed only by the adjustment unit provided on the fixed portion of the pickup guide shaft and the pickup sub guide shaft on the outer peripheral side of the disk. Therefore, the pickup guide shaft, so that the line segment connecting the two points of the fixed portion of the base unit chassis on the inner peripheral side of the disk of the two guide shafts and the recording surface of the disk are parallel to each other, It is necessary on the premise that the pickup sub guide shaft and the spindle motor are attached to the base unit chassis. If these are not parallel, the tangential skew on the inner circumference side of the disk cannot be adjusted, and there is a problem that performance such as jitter deteriorates on the inner circumference side of the disk.

  For these reasons, the height of the base unit chassis at the two fixed portions on the inner peripheral side of the disk to which the pickup guide shaft and the pickup sub guide shaft of the base unit chassis are attached and the height of the base unit chassis at the fixed mounting portion of the spindle motor. Now, it is necessary to add the vertical accuracy of the spindle axis with respect to the fixed surface of the spindle motor to the base unit chassis. Therefore, it takes time to add a mold for molding a base unit chassis made of synthetic resin, a press molding mold for a spindle motor, and a bearing caulking equipment, and it is sufficient for molding conditions and press conditions during mass production. Attention is required. In addition, since the performance of the parallelism error, jitter, etc. that could not be swept down, the equipment that requires a margin for the performance of jitter, etc. is rotated at high speed, used at high and low temperatures, under vibration, shock This will limit the use, which makes it difficult to improve the performance and portability of the device.

JP 2002-109819 A JP 11-66569 A

  An object of the present invention is to provide a disk drive device capable of highly accurate skew adjustment with a simple configuration.

  Another problem of the present application is that there is no difference in tangential skew within the movable range of the pickup, and the skew between the disk and the pickup can be adjusted to a vertical angle or an angle at which the performance such as jitter is optimal, and Pickup guide shaft, pickup sub guide shaft, parallelism of both guide shafts, line segment connecting two points of the inner peripheral side fixed portion of the discs of both guide shafts and the parallelism of the disc, the spindle motor to the base unit chassis The optical axis or irradiation axis of the pickup is not affected by the vertical accuracy of the spindle axis with respect to the fixed surface, the pickup guide shaft of the base unit chassis, the pickup sub guide shaft, the accuracy of adjusting the height of the fixed part of the spindle motor, etc. The skew adjustment is realized perpendicular to the recording surface of the disc or at an arbitrary angle. To provide a disk drives system.

  The above-described problems and further problems of the present application will be made clear by the present invention and its embodiments described below.

The main invention of this application is:
A base unit chassis,
A rotation drive unit mounted on the base unit chassis;
A disk rotated by the rotation drive unit;
A pair of guide shafts substantially parallel to the radial direction of the disk and substantially parallel to each other;
A pickup movable in the radial direction of the disk by the pair of guide shafts;
Moving means for moving the pickup in the radial direction of the disk by the pair of guide shafts;
Drive unit adjusting means for adjusting the rotational drive unit so that the axis of the pickup is at a predetermined angle in the radial direction and the tangential direction with respect to the disk;
Guide shaft adjusting means for adjusting one of the pair of guide shafts so that the axis of the pickup is at a predetermined angle in the tangential direction with respect to the disk;
The present invention relates to a disk drive device comprising:

  Here, it is preferable that the rotation driving unit is constituted by a spindle motor, a turntable is fixed to an output shaft of the spindle motor, and the disk is detachably held on the turntable. Further, it is preferable that chuck means is provided at the center of the turntable, and a claw provided on the outer periphery of the chuck means detachably holds the disk on the turntable. Further, the stator substrate of the spindle motor constitutes the chassis of the rotational drive unit, and the stator substrate is mounted on the base unit chassis via a radial adjustment mechanism and a tangential adjustment mechanism of the drive adjustment means. Is preferred. Preferably, a reference positioning portion is provided on the base unit, and the radial adjustment mechanism and the tangential adjustment mechanism tilt the stator substrate in directions perpendicular to each other with respect to the reference positioning portion. The radial positioning means and the tangential positioning means include a spring mounted on a boss provided on the base unit chassis, and a screw that presses the chassis substrate against the spring. It is preferable. The pair of guide shafts are mounted on the base unit chassis directly and in parallel with each other independently of the stator substrate, and one end of the pair of guide shafts is attached to the base unit chassis. On the other hand, it is preferable that the guide shaft adjusting means is attached so as to be adjustable in the height direction. A spring that is attached to the holding portion of the base unit chassis at one end of the one guide shaft and that presses the one end of the one guide shaft so as to float from the base unit chassis; It is preferable that the screw is configured to include a screw that presses one end of the one guide shaft against the base unit chassis against the spring. Preferably, the disk is composed of an optical disk, and signals are written and / or read by irradiating the optical disk with light by the pickup.

The invention related to the skew adjustment method is:
A base unit chassis,
A rotation drive unit mounted on the base unit chassis;
A disk rotated by the rotation drive unit;
A pair of guide shafts substantially parallel to the radial direction of the disk and substantially parallel to each other;
A pickup movable in the radial direction of the disk by the pair of guide shafts;
Moving means for moving the pickup in the radial direction of the disk by the pair of guide shafts;
In a disk drive device comprising:
The pickup is moved to the fulcrum side of the guide shaft adjusting means provided on one of the pair of guide shafts by the pair of guide shafts, so that the value that determines the performance of the disk drive device such as jitter becomes almost optimal. To adjust the skew in the radial direction and tangential direction of the rotation drive unit,
Next, the pickup is moved to the adjusting portion side of the guide shaft adjusting means, and the skew adjustment in the tangential direction is performed by the adjusting means provided on one of the pair of guide shafts so that the jitter value becomes almost optimal. The present invention relates to a skew adjustment method for a disk drive device.

  A preferable aspect of the invention included in the present application is a disk provided coaxially and detachably on the rotation axis of a spindle motor, a pickup guide shaft and a pickup sub-guide shaft provided substantially parallel to the disk. In a disk drive device comprising a pickup engaged with a thread mechanism such as a motor or a linear motor that allows the pickup to move within a predetermined range of the disk along both guide shafts, the axis of the pickup relative to the disk In this disk drive device, the angle, that is, the skew, can be adjusted in the radial direction and the tangential direction at the fixed portion of the base unit chassis of the spindle motor, and the tangential direction is adjusted by the pickup sub guide shaft.

  In the above disk drive device, when performing the skew adjustment, the pickup is moved to the fulcrum side of the skew adjustment of the pickup sub-guide shaft, and is provided in the fixed portion of the spindle motor so that the value of jitter or the like is optimized. The adjustment unit adjusts the skew in the radial direction and the tangential direction, and then moves the pickup to the skew adjustment unit side of the pickup sub-guide shaft so that the value of jitter etc. is optimized. Thus, skew adjustment in the tangential direction is performed. In such skew adjustment, when the fulcrum of the pickup sub-guide shaft is on the inner circumference side of the disk and the adjustment section is on the outer circumference side of the disk, first the adjustment is made so that the jitter value on the inner circumference side is optimized. Thereafter, the jitter value on the outer peripheral side is adjusted.

  As described above, in this embodiment, the skew of the pickup with respect to the disk can be adjusted in the radial direction and the tangential direction at the fixing portion of the spindle motor to the base unit chassis, and the tangential direction can be adjusted at the pickup sub guide shaft. It is possible to eliminate the problems of the prior art by adjusting the skew in the above two orders.

  According to the above aspect, the parallelism of the four points for supporting and attaching both ends of the pickup guide shaft of the base unit chassis and both ends of the pickup sub guide shaft, the fixed portion of the spindle motor of the base unit chassis, and the above four points The skew in the tangential and radial directions caused by the accuracy of the parallelism and the perpendicularity of the spindle axis with respect to the fixed surface of the stator substrate of the spindle motor is absorbed by the skew adjusting part provided on the spindle motor fixing part and the pickup sub guide shaft. The parallelism and perpendicularity can be set roughly. Accordingly, it is possible to shorten the follow-up time of the mold when the base unit chassis is molded with the synthetic resin, the press-molding mold of the spindle motor, and the bearing caulking equipment. In addition, the molding and pressing conditions during mass production can be realized with minimal monitoring. In addition, it is possible to drastically suppress changes in skew within the movable range of the pickup, suppress deterioration in performance such as jitter, and increase the speed and temperature of equipment that requires more performance such as jitter. The device can be used under vibration, vibration, and impact, making it possible to easily realize high performance and portability of the device.

  A main invention of the present application is a pair of a base unit chassis, a rotary drive unit mounted on the base unit chassis, a disk rotated by the rotary drive unit, and a pair of disks that are substantially parallel to the radial direction of the disk and substantially parallel to each other. Guide shaft, a pickup that can be moved in the radial direction of the disk by a pair of guide shafts, a moving means for moving the pickup in the radial direction of the disk by a pair of guide shafts, and an axis of the pickup with respect to the disk. Is adjusted so that a predetermined angle is set in the radial direction and the tangential direction, and one of the pair of guide shafts is set so that the axis of the pickup is at a predetermined angle in the tangential direction with respect to the disk. And a guide shaft adjusting means for adjusting to the above.

  Therefore, according to such a disk drive device, a line segment connecting the two points of the precision of the pair of guide shafts, the parallelism of the pair of guide shafts, and the end of the pair of guide shafts on the inner peripheral side of the disk. And the recording surface of the disk, the vertical accuracy of the rotation axis of the rotation drive unit with respect to the base unit chassis, and the height accuracy of the pair of guide shafts of the base unit chassis and the support unit of the rotation drive unit It is possible to adjust the skew so that the axis of the pickup is at an optimum angle with respect to the recording surface of the disc without being influenced, and there is no difference in tangential skew within the movable range of the pickup with respect to the disc. It becomes possible to adjust the angle of the pickup with respect to the disc to an optimum angle.

  The main invention related to the skew adjustment method is that the base unit chassis, the rotary drive unit mounted on the base unit chassis, the disc rotated by the rotary drive unit, and the radial direction of the disc are substantially parallel and substantially parallel to each other. In a disk drive apparatus comprising: a pair of guide shafts; a pickup that is movable in the radial direction of the disk by the pair of guide shafts; and a moving unit that moves the pickup in the radial direction of the disk by the pair of guide shafts. Is moved to the fulcrum side of the guide shaft adjusting means provided on one of the pair of guide shafts by the pair of guide shafts, and the rotational drive is performed so that the value that determines the performance of the disk drive device such as jitter becomes almost optimal. Adjust the skew in the radial and tangential directions. Next, the pickup is moved to the adjusting portion side of the guide shaft adjusting means, and the skew adjustment in the tangential direction is performed by the adjusting means provided on one of the pair of guide shafts so that the jitter value becomes almost optimal. It is what I did.

  Therefore, according to such a skew adjusting method, the pickup is moved to the fulcrum side of the guide shaft adjusting means to perform the skew adjustment in the radial direction and the tangential direction of the rotation driving portion, and thereafter the pickup is adjusted to the adjusting portion of the guide shaft adjusting means. By adjusting the skew in the tangential direction, there is no difference in the tangential skew within the movable range of the pickup with respect to the disc, and the axis of the pickup is set at an optimum angle with respect to the recording surface of the disc. Skew adjustment can be performed.

  The invention included in the present application will be described below with reference to the illustrated embodiments. The disk drive device according to this embodiment will be outlined with reference to FIGS. 1 to 9. The disk drive device includes an integral base unit chassis 10 made of a synthetic resin molding. A circular opening 11 is formed on the upper surface of the base unit chassis 10, and a turntable 12 is attached so as to face the circular opening 11. The turntable 12 includes a center chuck 13 at the center of the upper surface thereof. A chuck claw 14 is provided on the outer peripheral surface of the center chuck 13 so as to be able to protrude and retract, and an optical disk 80 (to be described later) is chucked by the chuck claw 14.

  Further, the base unit chassis 10 is formed with a laterally long opening 15 extending substantially in the center of the base unit chassis 10 in the radial direction with respect to the circular opening 11. An objective lens 17 of an optical pickup 16 is disposed in the horizontally long opening 15. The base unit chassis 10 includes three attachment portions 21, 22, and 23 on the outer side thereof. Each of these attachment portions 21, 22, and 23 holds a damper 24.

  The turntable 12 attached so as to face the circular opening 11 of the base unit chassis 10 is attached to the output shaft of the spindle motor 29 shown in FIG. A stator substrate 27 of the spindle motor 29 is mounted on the base unit chassis 10. Then, a rotor 28 having a magnet is mounted on the stator substrate 27 so as to face the coils on the stator substrate 27.

  An optical block 32 constituting the optical pickup 16 is attached to the side of the base unit chassis 10. The optical block 32 is made of an aluminum alloy die-cast, holds a semiconductor laser element and a reflection mirror therein, and has a circuit board 33 on its lower surface. The optical block 32 is supported by the guide shaft 35 and the sub guide shaft 36 disposed on both sides thereof so as to be movable in the radial direction of the optical disk 80 attached to the turntable 12.

  The guide shaft 35 passes through an insertion hole 37 formed on one side of the optical block 32. On the other hand, the sub guide shaft 36 is held by a U-shaped holding portion 38 formed on the opposite side surface of the optical block 32. An engaging plate 39 is attached to the side of the optical block 32 on the side where the guide shaft 35 is inserted, and an engaging claw 40 attached to the lower surface of the engaging plate 39 engages with a screw on the outer peripheral surface of the lead screw 41. It is like that.

  As shown in FIGS. 10 and 11, the lead screw 41 has a gear 42 at one end thereof, and a gear 44 attached to the output shaft of a sled motor 43 attached to the gear unit 42 while being held on the base unit chassis 10. The lead screw 41 is driven by the thread motor 43. The lead screw 41 and the thread motor 43 are closed by a subchassis 45 constituting a cover (see FIG. 2).

  Next, a mechanism for adjusting the angle of the objective lens 17 with respect to the optical disk 80 that is rotationally driven on the turntable 12, that is, the skew (see FIG. 17) will be described with reference to FIGS. A reference portion 48 is provided at a portion where the stator substrate 27 of the spindle motor 29 is attached to the base unit chassis 10. As shown in FIG. 14, the reference portion 48 includes a boss 49 connected to the base unit chassis 10, and a screw insertion hole 50 is formed in the stator substrate 27. A screw 51 passing through the screw insertion hole 50 is screwed into the female screw hole 52 of the boss 49, thereby setting reference positions in the X-axis direction, the Y-axis direction, and the Z-axis direction.

  On the stator substrate 27, a radial adjustment portion 53 is provided as shown in FIGS. As shown in FIG. 15, the radial adjustment portion 53 attaches a spring 55 to the boss 54 of the base unit chassis 10, and the spring 55 presses the lower surface of the screw insertion hole 56 of the stator substrate 27. Then, a screw 57 inserted through the screw insertion hole 56 is screwed into the female screw hole 58.

  Next, as shown in FIG. 12, the tangential adjustment unit 59 is provided in a direction different from the radial adjustment unit 53 by 90 degrees with respect to the reference unit 48. As shown in FIG. 16, the tangential adjustment unit 59 includes a boss 60 on the base unit chassis 10, and presses the lower surface of the stator substrate 27 by a spring 61 attached to the boss 60. A screw 63 that passes through a screw insertion hole 62 provided in the stator substrate 27 is screwed into the female screw hole 64 of the boss 60.

  As shown in FIG. 12, a long hole 67 for receiving the protrusion 66 of the base unit chassis 10 is formed on the side of the tangential adjustment portion 59 of the stator substrate 27 and on the side of the screw insertion hole 62. Yes. Positioning in the rotational direction around the reference portion 48 of the stator substrate 27 is performed by the elongated hole 67.

  Next, the guide shaft 35 that slidably supports the optical block 32 of the optical pickup 16 is directly supported at both ends by support portions 69 and 70 provided in the base unit chassis 10 as shown in FIGS. Is done. Here, the guide shaft 35 is not provided with means for adjusting the height direction of both ends thereof, and both ends of the guide shaft 35 are directly supported on the base unit chassis 10 by the support portions 69 and 70.

  In contrast, the sub guide shaft 36 that supports the side of the optical pickup 16 opposite to the optical block 32 is supported at one end by a fulcrum side support 71 shown in FIG. 18 and at the other end by an adjustment support 72. It has come to be supported. The adjustment-side support portion 72 includes a recess 73. The spring 74 inserted into the recess 73 presses the sub guide shaft 36 upward from below, and the screw 75 is screwed into the female screw hole 76 to the spring 74. The height of the sub-guide shaft 72 at the adjustment side support portion 72 is adjusted while being deformed.

  As described above, in the disk drive device of the present embodiment, as shown in FIGS. 1 to 9, the turntable 12 is attached to the output shaft of the spindle motor 29 on the same axis as the spindle motor 29. A center chuck 13 is provided on the same axis for mounting and fixing the disk 80. A chuck claw 14 is provided on the outer peripheral surface of the substantially cylindrical center chuck 13 by three springs so as to protrude from the outer peripheral surface of the center chuck 13 in the outer peripheral direction (see FIGS. 10 and 11).

  The disk 80 is fixed to the turntable 12 by utilizing the force that the chuck claw 14 provided on the center chuck 13 pushes in the outer circumferential direction of the center chuck 13 with a spring, and the center hole of the disk 80 is attached to the turntable 12 on the chuck claw 14. The disk 80 is fixed to the turntable 12 by being pressed with the inclined surface on the outer peripheral side. As a result, the rotational force of the spindle motor 29 is transmitted from the rotary shaft to the turntable 12, and the disk 80 mounted and fixed on the turntable 12 with the chuck claws 14 rotates.

  The rotating optical disk 80 is irradiated with a laser beam from the objective lens 17 of the optical pickup 16, whereby signal writing, reading, and erasing are performed. The optical block 32 of the optical pickup 16 is guided by a guide shaft 35 and a sub guide shaft 36 so as to be movable. The pickup guide shaft 35 is inserted through the insertion hole 37 of the optical block 32, while the sub guide shaft 36 is engaged with the U-shaped holding portion 38 on the opposite side of the optical block 32, whereby the optical block 32 is moved to the disc. 80 is movable in the radial direction.

  A lead screw 41 shown in FIGS. 9 and 9 is provided substantially parallel to the pickup guide shaft 35, and the engaging claw 40 of the engaging plate 39 of the optical block 32 is held in the groove of the lead screw 41. Then, the gear 42 coaxially mounted with the lead screw 41 is engaged with the gear 44 of the thread motor 43, and when the thread motor 43 is driven, the gear 42 of the lead screw 41 is rotated by the gear 44, and the rotation is the lead. It is transmitted to the screw 41. Therefore, the engaging claw 40 moves along the groove provided in the lead screw 41. Therefore, the optical pickup 16 composed of the optical block 32 can be moved to a predetermined range along the pickup guide shaft 35 and the pickup guide shaft 36, and thereby data can be freely written to and read from the disk 80.

  The stator board 27 of the spindle motor 29 is fixed to the base unit chassis 10 by screwing the three places of the stator board 27 shown in FIG. 12 to the base unit chassis 10 with screws 51, 57, and 63. As shown in FIG. 14, an XYZ reference boss 49 provided on the chassis 10 and a screw insertion hole 50 provided on the stator substrate 27 are engaged with each other to determine the XYZ direction.

  Another place is a boss 54 (see FIG. 15) which is provided in the direction of feeding the pickup 16 from the reference portion 48 and substantially on the X axis as shown in FIG. ). In addition, as shown in FIG. 12, the boss 60 (FIG. 16) is provided on the Y axis perpendicular to the feed direction of the pickup 16 from the reference portion 48 and provided at a height that does not contact the stator substrate 27. Reference).

  15 and 16, the stator substrate 27 is screwed to the bosses 54 and 60, respectively, and the heights of the radial adjustment portion 53 and the tangential adjustment portion 59 are set to the base unit chassis 10 and the stator substrate 27. Preload is applied to the stator substrate 27 by the springs 55 and 60 provided between them, and is determined by the screwing condition of the screws 57 and 63. As shown in FIG. 12, the positioning of the stator substrate 27 in the rotational direction is determined by the engagement between the protrusion 66 provided in addition to the XYZ reference portion 48 and the long hole 67 provided in the stator substrate 27.

  FIG. 17 shows the principle of skew adjustment of such a disk drive device. The stator substrate 27 that supports the optical disk 80 via the turntable 13 is supported at three locations: a reference portion 48, a radial adjustment portion 53, and a tangential adjustment portion 59. The height of the radial adjustment portion 53 and the tangential adjustment portion 59 is Adjustments can be made. On the other hand, the pickup guide shaft 35 is supported by support portions 69 and 70 whose both ends are fixed. The pickup sub-guide shaft 36 on the opposite side is supported at the center side of the optical disc 80 by a fixed support portion 71 and at the outer peripheral side end portion of the optical disc 80 by an adjustment-side support portion 72 so that the height can be adjusted.

  For skew adjustment, first, the optical pickup 17 is moved to the center side of the optical disk 80, and the stator substrate 27 is adjusted by the radial adjustment unit 53 and the tangential adjustment unit 59. This adjustment operation adjusts the skew of the optical disc 80 with respect to the optical axis of the objective lens 17 uniquely determined on the triangles 69, 70, and 71 in FIG. The skew adjustment of the optical axis in the radial direction is performed, and the tangential adjustment unit 59 adjusts the optical axis of the objective lens 17 in the tangential direction. That is, here, the skew adjustment is performed so that the angle between the optical axis of the objective lens 17 and the recording surface of the optical disc 80 is vertical or the jitter value is optimized. Since the angle formed between the recording surface of the optical disk 80 and the optical axis of the objective lens 17 is adjusted directly and purposefully, the components of the optical pickup 16 having the rotational drive unit of the optical disk 80 and the objective lens 17 are adjusted. All errors and assembly tolerances can be absorbed.

  When the adjustment of the radial adjustment unit 53 and the tangential adjustment unit 59 on the stator substrate 27 is finished, the optical pickup 16 is moved to the outer peripheral side with respect to the optical disc 80. This pays attention to the optical axis of the objective lens 17 that is uniquely determined by the triangles 69, 70, and 72. Then, the height of the adjustment-side support portion 72 of the pickup sub-guide shaft 36, that is, the support portion 72 of the triangles 69, 70, 72 on the sub-guide shaft 36 side is adjusted to adjust the skew in the tangential direction. This skew adjustment is substantially an adjustment so that the plane composed of the triangles 69, 70, 71 and the plane composed of the triangles 69, 70, 72 coincide.

  Again, the skew adjustment in the tangential direction is to adjust the angle between the optical axis of the objective lens 17 and the recording surface of the optical disc 80 so that the jitter value is optimized, so that the optical pickup 16 is configured. It is possible to absorb all of the tolerances and assembly errors of parts, and it is possible to perform skew adjustment purposely.

  Next, skew adjustment in the stator substrate 27 portion of the spindle motor 29 will be described. In the radial direction, the stator substrate 27 is moved up and down with respect to the reference portion 48 as shown in FIGS. 18 to 20 by tightening the screws of the screws 57 of the radial adjustment portion 53 provided on the X axis of the stator substrate 27. Thus, the spindle motor 29 is tilted with respect to the XYZ reference 48. 18 shows a state in which the stator substrate 27 is not tilted, FIG. 19 shows a state in which the screw 57 is tightened and the shaft of the spindle motor 29 is tilted leftward, and FIG. 20 shows that the screw 57 is loosened and the shaft of the spindle motor 29 is moved to the right. It shows a state tilted to the direction.

  Next, adjustment of the spindle motor 29 in the tangential direction is performed by bending the stator substrate 27 from the XYZ reference 48 by tightening the screws 63 of the tangential adjustment portion 59 (see FIG. 12) provided on the Y axis of the stator substrate 27. The spindle motor 29 is tilted with respect to the XYZ reference 48. 21 shows a state where the axis of the spindle motor 29 is vertical, FIG. 22 shows a state where the screw 63 is tightened and the axis of the spindle motor 29 is tilted to the right, and FIG. 23 shows that the screw 63 is loosened and the axis of the spindle motor 29 is left It shows the state tilted.

  Next, the pickup guide shaft 35 is fixed to the base unit chassis 10 as shown in FIGS. 8, 9, 12 and 13 by fixing both ends of the pickup guide shaft 35 to the base unit chassis by screwing, press-fitting, bonding or the like. 69, 70. Here, both ends of the guide shaft 35 are fixed to the base unit chassis 10 so as not to be adjusted.

  On the other hand, the pickup sub-guide shaft 36 is fixed to the fulcrum-side support 71 by screwing the inner peripheral end of the disk 80 to the base unit chassis 10 as shown in FIG. Fix it. On the other hand, the outer peripheral portion has a spring 74 inserted into a recess 73 provided in the base unit chassis 10 as shown in FIGS. Preload is applied. Then, the pickup sub guide shaft 36 is pressed by a screw 75 from above. That is, the portion 71 on the inner side of the disk 80 on the side of the spindle motor 29 shown in FIG. 25 of the pickup sub guide shaft 36 serves as a fulcrum for skew adjustment, while the portion on the outer side of the disk 80 supports the adjustment side. Part 72.

  The skew adjustment of the pickup sub guide shaft 36 is performed by moving the outer peripheral end of the pickup sub guide shaft 36 up and down with respect to the base unit chassis 10 by tightening the screw 75 on the outer peripheral side of the disk 80. When the parallelism with the sub guide shaft 36 is changed and the optical pickup 16 is tilted with respect to the disk 80, skew adjustment in the tangential direction is performed, and the optical pickup 16 is on the inner peripheral side of the disk 80. Adjustments are made so that there is no difference in the tangential skew between the case of being on the outer peripheral side.

  The skew adjustment operation of the pickup sub guide shaft 36 will be described in more detail. 24 to 27 show the adjustment operation by the screw 75 of the adjustment side support portion 72 of the pickup sub guide shaft 36. That is, when the screw 75 of the adjustment-side support portion 72 of the pickup guide shaft 36 is tightened, the result is as shown in FIGS. 24 and 25, and when the screw 75 is loosened, the screw 75 is loosened as shown in FIGS. Become.

  FIG. 25 shows that when the screw 75 is tightened, there is a difference in tangential skew between when the optical pickup 16 is on the fulcrum side support portion 71 side and when it is on the adjustment side support portion 72 side. . FIG. 24 shows a state where the optical pickup 16 is on the adjustment side support portion 72 side in FIG. 25, that is, a state where the optical pickup 16 is tilted to the left side due to tangential skew.

  On the other hand, FIG. 27 shows that when the screw 75 is loosened, there is a difference in tangential skew between when the optical pickup 16 is on the fulcrum side support portion 71 side and when it is on the adjustment side support portion 72 side. ing. FIG. 26 shows a state where the optical pickup 16 is on the adjustment side support portion 72 side in FIG. 27, that is, a state in which the optical pickup 16 is inclined to the right side due to tangential skew.

  As shown in FIGS. 24 to 27, the adjustment-side support 72 is provided even if the pickup guide shaft 35 and the pickup sub-guide shaft 36 are not parallel due to the accuracy and distortion of the base unit chassis 10. This indicates that the parallelism of the screws 75 can be easily adjusted by tightening the screws 75. The radial skew is determined by the parallelism between the disk 80 and the pickup guide shaft 35, and is not affected by the inclination of the pickup sub guide shaft 36. Therefore, in the state where the optical pickup 16 is brought close to the fulcrum side support portion 71 side, the radial skew adjustment and the tangential skew adjustment are performed by the adjustment portion provided in the fixed portion of the spindle motor 29. Only the tangential skew generated due to the non-parallel portion of the pickup guide shaft 35 and the pickup sub-guide shaft 36 due to the accuracy, distortion, etc. of the base unit chassis 10 is obtained in a state where the optical pickup 16 is brought closer to the adjustment side support portion 72 side. Adjustment is made by tightening the screw 75 of the adjustment side support 72. By such adjustment, no difference occurs in the tangential skew regardless of the position of the optical pickup 16 on the inner and outer periphery of the disk 80, and the tangential skew and radial skew are adjusted to positions where the jitter value is optimized. FIGS. 24-27 show that this is possible.

  Next, a procedure for skew adjustment will be described.

  Stage 1: The optical pickup 16 is moved to the fulcrum side support part 71 side of the pickup sub-guide shaft 36, and the adjustment part provided in the fixed part of the spindle motor 29 so that the value of jitter etc. on the fulcrum side of skew adjustment is optimized. To adjust the skew in the radial direction and the tangential direction. Here, when the fulcrum side support portion 71 is on the inner periphery side of the disk 80 and the adjustment side support portion 72 is on the outer periphery side of the disk 80, the skew adjustment is performed so that the value of the inner periphery side jitter is optimized.

  Step 2: Next, the optical pickup 16 is moved to the adjustment side support portion 72 side of the pickup sub guide shaft 36, and skew adjustment in the tangential direction is performed by the adjustment portion of the pickup sub guide shaft 36 so that the value of jitter or the like is optimized. To do. When the fulcrum side support portion 71 is on the inner periphery side of the disk 80 and the adjustment portion is on the outer periphery side of the disk 80, the values of jitter and the like on the outer periphery side of the disk 80 are adjusted.

  By adjusting the skew in the above-described structure and in the steps 1 and 2, the accuracy of the base unit chassis 10 and the spindle of the stator substrate 27 of the spindle motor 29 with respect to the fixed surface of the base unit chassis 10 are adjusted. Even if the parallelism between the line connecting the two points of the fixing portions 69 and 70 of the pickup guide shaft 35 with respect to the base unit chassis 10 and the recording surface of the optical disc 80 does not appear due to the poor verticality of the shaft, the spindle motor 29 is fixed. By adjusting the skew in the radial direction by the adjusting portion 53 provided in the portion, the above non-parallelism defect can be absorbed.

  Further, even if the parallelism between the line connecting the two points of the fixed portion of the pickup guide shaft 35 and the pickup sub guide shaft 36 to the base unit chassis 10 on the inner peripheral side of the disk 80 and the recording surface of the optical disk 80 does not appear. By adjusting the tangential direction by the adjusting portion 59 provided on the fixed portion of the spindle motor 29, the above-described parallelism defect can be absorbed. Even if the parallelism between the pickup guide shaft 35 and the pickup sub guide shaft 36 is not obtained, the adjustment in the tangential direction is performed by the adjustment portion 72 provided on the outer peripheral side of the disk 80 of the fixed portion of the pickup sub guide shaft 36. It can be absorbed by doing so, thereby eliminating the conventional problems.

  In addition to the above configuration, the adjustment portion of the pickup sub guide shaft 36 is provided on the inner peripheral side of the disc 80, and the end on the outer peripheral side of the disc 80 is used as a fulcrum side support portion. Can be resolved. Therefore, the adjustment-side support portion 72 of the sub guide shaft 36 may not be the outer peripheral side of the optical disc 80 but the inner peripheral side.

  The radial adjustment unit 53 of the stator substrate 27 of the spindle motor 29, the tangential adjustment unit 59, and the adjustment unit 72 of the pickup sub guide shaft 36 use various elastic bodies such as a coil spring, a leaf spring, and an elastic body. However, the present invention is not limited to the springs 55 and 61 formed of the coil spring in the above embodiment. That is, the adjustment units 53, 59, 72 may be provided so as to be movable and adjustable in the adjustment direction.

  Although the invention included in the present application has been described with the illustrated embodiment, the invention included in the present application is not limited to the above-described embodiment, and various modifications are possible within the scope of the technical idea of the invention included in the present application. Is possible. For example, the invention included in the present application can be applied to a disk drive device using various disk-shaped recording media such as an optical disk and a magneto-optical disk, and is not limited to a CD, a CD-R, a DVD, and the like.

  The present invention is a disk drive apparatus using a disk-shaped recording medium such as an optical disk or a magneto-optical disk, and can be widely applied industrially as a means for recording various signals.

1 is an external perspective view of a disk drive device.

1 is an external perspective view of the back surface of a disk drive device.

It is the disassembled perspective view seen from the back side of the disc drive apparatus.

It is a top view of a disk drive device.

1 is a front view of a disk drive device.

It is a side view of a disk drive device.

It is a bottom view of a disk drive device.

It is a principal part bottom view of the state which removed the subchassis (cover) of the disk drive apparatus.

It is a bottom view of the state which removed the lead screw of the disk drive device.

It is a top view which shows the turntable and optical pick-up of a disk drive apparatus.

It is the same front view.

It is a principal part top view of the mechanism for skew adjustment.

It is the same front view.

It is a longitudinal cross-sectional view of a reference | standard part.

It is a longitudinal cross-sectional view of a radial adjustment part.

It is a longitudinal cross-sectional view of a tangential adjustment part.

It is a perspective view of the disk which shows the principle of skew adjustment.

It is a front view which shows adjustment operation of a radial adjustment part.

It is a front view which shows adjustment operation of a radial adjustment part.

It is a front view which shows adjustment operation of a radial adjustment part.

It is a front view which shows adjustment operation | movement of a tangential adjustment part.

It is a front view which shows adjustment operation | movement of a tangential adjustment part.

It is a front view which shows adjustment operation | movement of a tangential adjustment part.

It is a side view of the state which tightened the screw of the tangential adjustment part of a sub guide shaft.

It is the same front view.

It is a side view of the state which loosened the screw of the tangential adjustment part of a sub guide shaft.

It is the same front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Base unit chassis, 11 ... Circular opening, 12 ... Turntable, 13 ... Center chuck, 14 ... Chuck claw, 15 ... Horizontal opening, 16 ... Optical pick-up, 17 ... Objective lens, 21 to 23 ... Mounting part, 24 ... Damper, 27 ... Stator board, 28 ... Rotor, 29 ... Spindle motor, 32 ... Optical block, 33 ... Circuit board, 35 ... Guide shaft, 36 ... Sub guide shaft 37 Insertion hole 38 U-shaped holding part 39 Engaging plate 40 Engaging claw 41 Lead screw 42 Gear 43 43 Thread motor 44 ... gear, 45 ... sub chassis (cover), 48 ... reference part, 49 ... boss, 50 ... screw insertion hole, 51 ... screw, 52 ... female screw hole, 53 ... radial adjustment part, 54 ... Boss, 5 Spring, 56 Screw insertion hole, 57 Screw, 58 Female screw hole, 59 Tangential adjustment part, 60 Boss, 61 Spring, 62 Spring insertion hole, 63 Screw, 64 ... female screw hole, 66 ... projection, 67 ... long hole, 69, 70 ... support part, 71 ... fulcrum side support part, 72 ... adjustment side support part, 73 ... recess, 74 Spring, 75 Screw, 76 Female screw hole, 80 Optical disk

Claims (10)

A base unit chassis,
A rotation drive unit mounted on the base unit chassis;
A disk rotated by the rotation drive unit;
A pair of guide shafts substantially parallel to the radial direction of the disk and substantially parallel to each other;
A pickup movable in the radial direction of the disk by the pair of guide shafts;
Moving means for moving the pickup in the radial direction of the disk by the pair of guide shafts;
Drive unit adjusting means for adjusting the rotational drive unit so that the axis of the pickup is at a predetermined angle in the radial direction and the tangential direction with respect to the disk;
Guide shaft adjusting means for adjusting one of the pair of guide shafts so that the axis of the pickup is at a predetermined angle in the tangential direction with respect to the disk;
A disk drive device comprising:   2. The disk drive according to claim 1, wherein the rotation drive unit is constituted by a spindle motor, a turntable is fixed to an output shaft of the spindle motor, and the disk is detachably held on the turntable. apparatus.   3. The disk according to claim 2, wherein chuck means is provided at a center part of the turntable, and a claw provided on an outer peripheral part of the chuck means detachably holds the disk on the turntable. Drive device.   A stator substrate of the spindle motor constitutes a chassis of the rotational drive unit, and the stator substrate is mounted on the base unit chassis via a radial adjustment mechanism and a tangential adjustment mechanism of a drive adjustment means. 3. The disk drive device according to claim 2, wherein   A reference positioning portion is provided on the base unit, and the radial adjustment mechanism and the tangential adjustment mechanism tilt the stator substrate in directions perpendicular to each other with respect to the reference positioning portion. The disk drive device according to claim 4.   The radial positioning means and the tangential positioning means are composed of a spring mounted on a boss provided on the base unit chassis, and a screw that presses the chassis substrate against the spring. 6. The disk drive device according to claim 5, wherein:   The pair of guide shafts are mounted on the base unit chassis directly and in parallel with each other independently of the stator substrate, and one end of the pair of guide shafts is connected to the base unit chassis. 2. The disk drive device according to claim 1, wherein the disk drive device is mounted so as to be adjustable in a height direction by the guide shaft adjusting means.   The guide shaft adjusting means is attached to a holding portion of the base unit chassis at one end of the one guide shaft and presses the one end of the one guide shaft so as to float from the base unit chassis; 8. The disk drive device according to claim 7, comprising a screw that presses one end of the one guide shaft against the base unit chassis against a spring.   2. The disk drive device according to claim 1, wherein the disk is composed of an optical disk, and signals are written and / or read by irradiating the optical disk with light by the pickup. A base unit chassis,
A rotation drive unit mounted on the base unit chassis;
A disk rotated by the rotation drive unit;
A pair of guide shafts substantially parallel to the radial direction of the disk and substantially parallel to each other;
A pickup movable in the radial direction of the disk by the pair of guide shafts;
Moving means for moving the pickup in the radial direction of the disk by the pair of guide shafts;
In a disk drive device comprising:
The pickup is moved to the fulcrum side of the guide shaft adjusting means provided on one of the pair of guide shafts by the pair of guide shafts, so that the value that determines the performance of the disk drive device such as jitter becomes almost optimal. To adjust the skew in the radial direction and tangential direction of the rotation drive unit,
Next, the pickup is moved to the adjustment portion side of the guide shaft adjustment means, and the skew adjustment in the tangential direction is performed by the adjustment means provided on one of the pair of guide shafts so that the jitter value becomes almost optimal. And a skew adjustment method for a disk drive device.

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