JP4224482B2 - Disk drive - Google Patents

Description

  The present invention relates to a disk drive device that rotates a recording disk such as an optical disk using a spindle motor as a drive source, and more particularly to a disk drive device that improves the positional accuracy of a spindle motor attached to a drive chassis.

  This type of disk drive device has a drive chassis that movably supports an optical pickup, a spindle motor attached to the drive chassis, a turntable fixed to the rotating shaft of the spindle motor, and a recording disk on the turntable. It is roughly configured by a pressing clamper, etc., and after the recording disk placed on the turntable is pressed by the clamper to be in a clamped state, the turntable, the recording disk and the clamper are integrated with a spindle motor as a driving source. In addition to rotational driving, the optical pickup is transported in the radial direction of the recording disk, whereby information recording and / or reproducing operations are performed on the recording disk.

  Conventionally, in such a disk drive device, a spindle motor is attached to the drive chassis via an adjustment mechanism, and the adjustment position of the spindle motor with respect to the drive chassis can be adjusted using this adjustment mechanism in the assembly stage. (For example, refer to Patent Document 1). In such a conventional disk drive device, the spindle motor is mounted on the lower surface side of the drive chassis using a plurality of mounting screws, and the rotating shaft of the spindle motor extends upward through the drive chassis. The adjusting mechanism is interposed in a space where the spindle motor and the drive chassis are opposed to each other, and includes a concave spherical member fixed to the upper surface of the spindle motor, and a convex spherical member fixed to the lower surface of the drive chassis. It consists of The convex spherical member is laminated on the concave spherical member, and both the spherical members are in slidable surface contact.

Then, when the mounting screw is screwed back and forth in the screwing portion on the drive chassis side in the assembly stage, the concave spherical member slides with respect to the convex spherical member, so that the mounting posture of the spindle motor with respect to the drive chassis changes. As a result, the rotation axis of the spindle motor can be tilted by a predetermined amount in the radial direction or tangential direction of the recording disk, so that the axis direction of the spindle motor rotation axis follows the optical axis direction of the objective lens of the optical pickup. Thus, the position accuracy of the turntable fixed to the tip of the rotating shaft can be improved.
JP 2000-311429 A (page 4-5, FIG. 4)

  By the way, the above-mentioned conventional disk drive device can adjust the mounting position of the spindle motor with respect to the drive chassis (inclination of the rotation axis of the spindle motor), but can adjust the height position of the spindle motor with respect to the drive chassis. Therefore, there is a possibility that the distance between the drive chassis and the turntable may deviate from the allowable value due to various factors such as accumulation of tolerances of component dimensions and mounting positions. In that case, since the distance between the recording surface of the optical disk placed on the turntable and the objective lens of the optical pickup (working distance) exceeds the allowable value, servo control becomes impossible. Even if it is adjusted, it cannot be operated normally.

  A method of correcting the distance between the turntable and the drive chassis by adjusting the mounting position of the turntable with respect to the spindle of the spindle motor with a screw or the like has been proposed. It is not preferable to set the connecting portion of the rotating shaft and the turntable as an adjustment portion because reliability of power transmission is impaired.

The present invention has been made in view of the actual situation of the conventional technology, and an object of the present invention is to provide a disk drive device that can easily and accurately adjust the mounting posture and height position of the spindle motor with respect to the drive chassis. It is in.

In the present invention, the sliding contact member integrated with the bottom of the spindle motor is slid along the guide surface of the pedestal member, so that the attitude of the spindle motor on the pedestal member can be adjusted and the drive chassis can be adjusted. The height position of the spindle motor with respect to the drive chassis can be adjusted by screwing a base member into the provided motor mounting hole and screwing the base member back and forth with respect to the motor mounting hole. That is, a spherical portion is formed on at least one of the bottom surface of the sliding contact member and the guide surface of the pedestal member, and the sliding contact member is slid along the guide surface so that the rotation axis of the spindle motor can be adjusted in the recording disk at the assembly stage. It is possible to perform adjustment by tilting a predetermined amount in the radial direction or tangential direction, and the position accuracy of the turntable can be improved by such adjustment. Further , the male screw portion is formed on the outer wall surface of the pedestal member, and the female screw portion that can be screwed to the male screw portion is formed on the inner wall surface of the motor mounting hole, so that the pedestal member can be screwed back and forth into the motor mounting hole. Therefore, it is possible to adjust the mounting height with respect to the drive chassis by moving the spindle motor held and fixed on the base member in the assembling stage in the screwing direction or screwing direction. Then, after the adjustment is completed, the base member is bonded and fixed to the drive chassis, so that the spindle motor set to a desired mounting height is attached to the drive chassis.

The disk drive device according to the present invention slides a sliding contact member integrated with the bottom of the spindle motor along the guide surface of the base member, so that the mounting position of the spindle motor relative to the drive chassis during assembly (rotation of the spindle motor) In addition to being able to adjust the inclination of the shaft easily and with high accuracy, the mounting height of the spindle motor to the drive chassis can be easily and highly set by assembling the base member by screwing it back and forth into the motor mounting hole of the drive chassis. Since the accuracy can be adjusted, the yield can be improved and the quality can be stabilized.

The present invention includes a spindle motor attached to a drive chassis, and a turntable integrated with a rotation shaft of the spindle motor, and a recording disk placed on the turntable is used as a drive source for the spindle motor. In the disk drive device rotating as described above, a slide contact member integrated with the bottom of the spindle motor is mounted on a base member having an external thread portion on the outer wall surface, and the guide is in sliding contact with the base member and the bottom surface of the slide contact member Providing a motor mounting hole in the drive chassis having a spherical surface formed on at least one of the bottom surface and the guide surface of the sliding contact member and having an internal thread on the inner wall surface, The male screw part of the pedestal member is screwed back and forth with respect to the female screw part, so that the speed of the drive chassis is reduced. None the height position of the Dorumota adjustable, the base member after the adjustment while adhered and fixed to the drive chassis, the on the base member by sliding the sliding member along the guide surface The posture of the spindle motor can be adjusted, and after the adjustment, the sliding contact member is bonded and fixed to the base member .

According to the disk drive device configured as described above, the slide motor integrated with the bottom portion of the spindle motor is slid along the guide surface of the pedestal member at the assembly stage, whereby the spindle motor with respect to the drive chassis. Therefore, if the sliding contact member is bonded and fixed to the pedestal member after the adjustment is completed, the positional accuracy of the turntable fixed to the rotating shaft of the spindle motor can be improved. In addition, since the mounting height of the spindle motor with respect to the drive chassis can be adjusted by screwing the base member holding and fixing the spindle motor back and forth into the motor mounting hole of the drive chassis, the base member can be adjusted after the adjustment is completed. If it is bonded and fixed to the drive chassis, the spindle motor set to a desired mounting height is fixed to the drive chassis. That is, the adjustment of the height of the spindle motor to the drive chassis and the adjustment of the orientation of the spindle motor 2 to the drive chassis can be easily and accurately performed at the assembly stage, which improves yield and improves quality. Stabilization can be achieved.

  In this case, if the guide surface of the pedestal member is a concave spherical surface and the bottom surface of the sliding contact member is a convex spherical surface, the pedestal member having an external thread portion on the outer wall surface can be formed into a thin shape at the center. It is preferable because the entire apparatus can be easily reduced in thickness. In addition, a through hole is formed in the pedestal member, and if the sliding contact member is bonded and fixed to the pedestal member with an adhesive filled in the through hole, it is screwed into the motor mounting hole of the drive chassis. Since the adhesive can be easily filled in the through hole exposed on the bottom surface of the base member, the assembly workability is improved, which is preferable.

  Embodiments will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a disk drive device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the main portion of the disk drive device, and FIG. FIG. 4 is a bottom view of the disk drive device.

  The disk drive apparatus shown in these drawings includes a spindle motor 2 attached to a drive chassis 1, a turntable 4 integrated with a rotating shaft 3 of the spindle motor 2, and a sliding contact fixed to the bottom of the spindle motor 2. It is mainly configured by a member 5, a base member 7 screwed into the motor mounting hole 6 of the drive chassis 1, and a clamper (not shown) that presses the optical disk D (see FIG. 2) onto the turntable 4.

  The motor mounting hole 6 is provided at the end of the drive chassis 1, and a female screw part 6 a that can be screwed with a male screw part 7 c of a base member 7 described later is formed on the inner wall surface of the motor mounting hole 6. The drive chassis 1 is provided with a space 1a adjacent to the motor mounting hole 6, and an optical pickup (not shown) that can move along the radial direction (radial direction) of the optical disk D is provided in the space 1a. Has been placed.

  The spindle motor 2 is a brushless motor in which the rotor 2b and the rotary shaft 3 rotate integrally with the stator 2a. Although not shown, the stator 2a has a coil attached to the inner peripheral surface of the rotor 2b. Has a magnet attached. The rotating shaft 3 protrudes upward from the center of the rotor 2b, and a synthetic resin turntable 4 is press-fitted and fixed to the rotating shaft 3. An annular guide wall 4a is erected on the upper surface of the turntable 4, and the optical disk D is centered by sliding the peripheral edge of the center hole of the optical disk D on the narrow outer wall surface of the guide wall 4a. Done. An annular disc mounting surface 4b is formed on the outermost peripheral portion of the turntable 4, and the optical disc D is sandwiched between the disc mounting surface 4b and the clamper (see FIG. 2). .

  The slidable contact member 5 is a metal annular member having a convex bottom surface. A positioning hole 5a is formed in the center of the sliding contact member 5, and screw holes 5b are formed in two locations around the positioning hole 5a. It is installed. The spindle motor 2 is held and fixed on the sliding contact member 5 by inserting the bottom portion of the stator 2a into the positioning hole 5a and screwing the pair of screws 10 through the screw holes 5b to the stator 2a. Yes. The bottom surface 5c of the slidable contact member 5 is a convex spherical surface, and the bottom surface 5c is in surface contact with a guide surface 7a of a pedestal member 7 described later so as to be slidable.

  The pedestal member 7 is a metal disk-shaped member in which a mortar-shaped guide surface 7a is formed around the central portion on the upper surface side, and through holes 7b are formed at a plurality of locations on the guide surface 7a. As shown in FIG. 2, the guide surface 7a is a concave spherical surface that comes into surface contact with the bottom surface 5c of the sliding contact member 5. By sliding the sliding contact member 5 along the guide surface 7a, the pedestal member 7 is provided. The mounting posture of the spindle motor 2 (inclination of the rotating shaft 3) can be adjusted. Then, after adjusting the mounting posture of the spindle motor 2, the sliding contact member 5 is bonded and fixed to the pedestal member 7 with the adhesive 8 filled in each through hole 7b. Further, since the external threaded surface 7c of the motor mounting hole 6 is formed on the outer wall surface of the pedestal member 7, the male threaded portion 7c can be screwed. The mounting height of the spindle motor 2 held and fixed on the base member 7 with respect to the drive chassis 1 can be adjusted. Then, after adjusting the mounting height of the spindle motor 2, an adhesive 9 is injected into the gap between the female screw portion 6a and the male screw portion 7c to bond and fix the base member 7 to the drive chassis 1.

  In the disk drive device configured as described above, after the optical disk D placed on the turntable 4 is pressed by the clamper to be in a clamped state, the turntable 4 is integrated with the optical disk D and the clamper by the spindle motor 2. In addition, the optical pickup (not shown) is driven to rotate in the radial direction, and the recording surface of the optical disc D is irradiated with the light flux of the optical pickup to perform information recording and / or reproducing operations. it can.

  As described above, the disk drive device according to the present embodiment attaches the spindle motor 2 to the drive chassis 1 at the time of assembly by screwing the base member 7 for holding and fixing the spindle motor 2 into the motor mounting hole 6 of the drive chassis 1. Since the height can be adjusted, if the adhesive member 9 is injected into the gap between the female screw portion 6a and the male screw portion 7c and the base member 7 is bonded and fixed to the drive chassis 1 after the adjustment is completed, the desired mounting height is set. The spindle motor 2 is fixed to the drive chassis 1. In other words, when it is necessary to adjust the mounting height of the spindle motor 2 due to various factors such as accumulation of component dimensions and mounting position tolerances, the mounting member 7 is screwed back and forth in the motor mounting hole 6 to adjust the mounting height. Can be corrected easily and with high accuracy, yield can be improved and quality can be stabilized.

  Further, in the disk drive device according to the present embodiment, the bottom surface 5c of the sliding contact member 5 attached to the bottom of the spindle motor 2 is in surface contact with the guide surface 7a of the base member 7 so as to be slidable. The sliding contact member 5 can be smoothly slid along the guide surface 7a until the adhesive 8 is filled, so that the mounting posture of the spindle motor 2 on the base member 7 (inclination of the rotating shaft 3) is adjusted. It is also easy to do. In other words, both the adjustment of the mounting height of the spindle motor 2 with respect to the drive chassis 1 and the adjustment of the mounting posture of the spindle motor 2 with respect to the drive chassis 1 can be easily and highly accurately performed at the assembly stage. The positional accuracy of the turntable 4 fixed to the rotating shaft 3 can also be improved. In addition, in this embodiment, the guide surface 7a of the pedestal member 7 is formed in a concave spherical surface, and the bottom surface 5c of the sliding contact member 5 in surface contact with the guide surface 7a is formed in a convex spherical surface. The pedestal member 7 having the male threaded portion 7c on the wall surface can be formed into a shape with a thin central portion, which makes it easy to reduce the thickness of the entire apparatus.

  The sliding contact member 5 and the pedestal member 7 can be bonded and fixed at appropriate places. However, as in this embodiment, a plurality of through holes 7b drilled in the pedestal member 7 are filled with the adhesive 8 and slid. If the contact member 5 is bonded and fixed, the adhesive 8 can be easily applied to each through hole 7b (see FIG. 4) exposed on the bottom surface of the base member 7 screwed into the motor mounting hole 6 of the drive chassis 1. Since it can be filled, the assembly workability is improved.

  In the above-described embodiment, the case where the turntable 4 having the guide wall 4a and the disk mounting surface 4b is press-fitted and fixed to the rotating shaft 3 of the spindle motor 2 has been described. However, the turntable is attached to the rotor 2b integral with the rotating shaft 3. It may be fixed. In this case, a turntable having a centering guide wall can be fixed to the center of the upper surface of the rotor, and a sheet or the like as a disk mounting surface can be attached to the outer periphery of the upper surface of the rotor. May be integrated directly or indirectly with the rotating shaft 3 of the spindle motor 2.

  In the above-described embodiment, the guide surface 7a of the base member 7 may be a concave conical surface, and the bottom surface 5c of the sliding contact member 5 may slide in a line contact state with respect to the conical surface. In this case, the bottom surface 5c of the slidable contact member 5 does not have to be a spherical surface over the entire circumference. For example, hemispherical small protrusions are projected at three locations, and the tips of the small protrusions are in point contact with the conical surface. However, it is also possible to allow sliding. Alternatively, the guide surface 7 a of the base member 7 may be a convex spherical surface, and a concave spherical surface or a conical surface may be formed on the bottom surface 5 c of the sliding contact member 5.

1 is an exploded perspective view of a disk drive device according to an embodiment of the present invention. It is principal part sectional drawing of this disk drive device. It is the perspective view which looked at this disk drive device from the upper surface side. It is a bottom view of the disk drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive chassis 2 Spindle motor 3 Rotating shaft 4 Turntable 5 Sliding contact member 5b Screw hole 5c Bottom surface 6 Motor mounting hole 6a Female thread part 7 Base member 7a Guide surface 7b Through-hole 7c Male thread part 8 Adhesive 9 Adhesive D Optical disk (recording) disk)

Claims (3)

A disk having a spindle motor attached to a drive chassis and a turntable integrated with a rotating shaft of the spindle motor, and rotating a recording disk placed on the turntable using the spindle motor as a drive source In the drive device,
A sliding contact member integrated with the bottom of the spindle motor is mounted on a base member having an external thread on the outer wall surface, and a guide surface is provided on the base member to be in sliding contact with the bottom surface of the sliding contact member. The drive chassis is provided with a motor mounting hole having a spherical surface formed on at least one of the bottom surface of the member and the guide surface, and having an internal thread on the inner wall surface;
The height position of the spindle motor with respect to the drive chassis can be adjusted by screwing and retracting the male screw portion of the pedestal member with respect to the female screw portion of the motor mounting hole, and after the adjustment, the pedestal member is moved to the drive The posture of the spindle motor on the pedestal member can be adjusted by adhering and fixing to the chassis and sliding the slidable contact member along the guide surface. After the adjustment, the slidable contact member is moved to the pedestal. A disk drive device characterized by being bonded and fixed to a member . 2. The disk drive device according to claim 1 , wherein the guide surface is a concave spherical surface, and the bottom surface of the sliding contact member is a convex spherical surface. 3. The disk drive according to claim 1 , wherein a through hole is formed in the pedestal member, and the sliding contact member is bonded and fixed to the pedestal member with an adhesive filled in the through hole. apparatus.

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