JP2002269768A - Adjustment mechanism in optical disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the skew and the height of an optical pickup without changing the accuracy of engagement of a rack-and-pinion mechanism. SOLUTION: A spindle motor 16 having a turn table 18 is fit on a chassis. A carriage 22 movably supported by a slide shaft 26, a driving motor 27 for moving the carriage, and a gear train 28 are provided on a base block 24 and are unitized with the base block 24. Both sides of the base block 24 are supported by an adjustment mechanism 40 on the chassis 14 in a way that the attitude of the base block is adjustable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adjusting mechanism for easily adjusting the skew and height of an optical pickup in an optical disk device.

[0002]

2. Description of the Related Art In an optical disk apparatus which records information on an optical disk such as a CD, a CD-ROM, a DVD-ROM, etc., reproduces the recorded information, or performs recording and reproduction, the optical disk is generally provided with a spindle. A carriage mounted with an optical pickup is moved in a radial direction of an optical disk along a slide main axis and a slide sub-axis while being mounted on a turntable on a motor and rotated.

[0003] In recent years, optical disk devices have been developed to reduce the wavelength of a semiconductor laser and increase the NA (numerical) of an objective lens.
APERTURE) to realize a small light spot,
It enables high-density large-capacity recording / reproduction. On the other hand, when there is an inclination (skew) of the lens optical axis of the optical pickup with respect to the optical disk surface, a large coma aberration occurs in proportion to the cube of NA, so that it is necessary to introduce a tilt correction unit.

Further, the distance (Wor) between the objective lens constituting the optical pickup and the surface of the optical disk by increasing the NA is increased.
Since the king distance is narrowed, it is necessary to adjust the height of the optical pickup in order to prevent the objective lens from colliding with the optical disk. Therefore, conventionally, as disclosed in Japanese Patent Application Laid-Open No. 2000-149299, a method of adjusting the mounting surface of a spindle motor having a turntable with reference to a mounting surface, and as disclosed in Japanese Patent Application Laid-Open No. 11-328705, A method is employed in which a plane formed by a slide main shaft and a slide sub shaft, which are guide shafts, is adjusted with reference to a turntable surface.

[0005]

However, the method of adjusting the spindle motor on the basis of the mounting surface of the spindle motor has a disadvantage that errors in the turntable itself cannot be absorbed. Further, the method of adjusting the plane formed by the slide main shaft and the slide sub shaft with reference to the turntable surface has the following disadvantages.

[0006] As shown in FIG.
The radial movement of the optical disk of the carriage 104 on which the carriage 104 is mounted is performed along the slide shaft 106. In many cases, the carriage 104 is driven by a pinion 108 connected to a drive motor on the base side. 104
This is performed by meshing with the rack 110 on the side and the pinion 108 rotating forward and reverse. Therefore, the slide shaft 10
If 6 is adjusted, a meshing error occurs between the pinion 108 and the rack 110, and if the adjustment amount is large, there is a possibility that meshing or gear disengagement may occur. The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a drive system for a carriage including a pinion rack mechanism even when the turntable itself has an error. It is an object of the present invention to provide an adjusting mechanism of an optical disk device that can easily adjust the skew and height of an optical pickup without changing the engagement accuracy of a pinion / rack mechanism even when the optical pickup is used.

[0007]

In order to achieve the above object, the present invention provides a spindle motor provided on a chassis for rotating an optical disk, and a base block provided on the chassis facing the spindle motor. A carriage on which an optical pickup is mounted, a guide mechanism for supporting the carriage on the base block so as to be movable in a radial direction of the optical disc, and a driving unit for moving the carriage, and record information on the optical disc. / Reproducing an optical disk device. In the present invention,
The spindle motor is supported by a chassis, the guide mechanism and the driving unit are supported by a base block, and an adjustment mechanism for adjusting the attitude of the base block with respect to the chassis is provided.

According to the present invention, the carriage on which the optical pickup is mounted, the guide mechanism of the carriage, and the driving means of the carriage are all supported by the base block, and the posture of the base block is adjusted by the adjustment mechanism. Therefore, the skew adjustment and the height adjustment of the optical pickup are easily performed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 (A) and 1 (B) are explanatory views of an adjusting mechanism in an optical disk device, FIG. 2 is a perspective view of the optical disk device, FIG. 3 is an exploded perspective view of the adjusting mechanism, and FIG. 4 is a description of attaching an inner plate to a base block. 5 is an exploded perspective view of the adjusting mechanism, and FIG. 6 is an exploded perspective view of the adjusting mechanism. As shown in FIG. 1A, an optical disk device 12 for recording / reproducing information on / from an optical disk includes a spindle motor 16 disposed at the center of a chassis 14, and a turntable 18 is provided above an output shaft of the spindle motor 16. Is provided. The optical disk device has a 2-channel specification in the present embodiment, and optical pickups 20 are provided on both sides of the spindle motor 16, respectively. Each of the optical pickups 20 is mounted on a carriage 22, and each carriage 22 is mounted on the base block 2.
The optical pickups 20 are arranged so as to be movable along a slide shaft 26 supported by 4, whereby each optical pickup 20 is configured to move along the radial direction of the optical disk mounted on the turntable 18.

Referring to FIG. 2 in more detail, where both blocks 24 face the spindle motor 18,
Notch 240 for accommodating spindle motor 18
2 are provided, and a drive motor 27 for moving the carriage and a drive motor 2
7 is transmitted to the carriage 22. The pinion 3 located at the output end of the gear train 28 is provided.
0 meshes with the rack 32 of the carriage 22. Two slide shafts 26 are provided so as to sandwich the spindle motor 16, and both ends of each slide shaft 26 are supported by mounting portions provided on the base block 24. Three bearings 34 project from the upper surface of the carriage 22, two bearings 34 are slidably coupled to one slide shaft 26, and the other one bearing 34 slides on the other slide shaft 26. Are combined as possible.

Therefore, the carriage 22 movably supported by the slide shaft 26 on the base block 24
Drive motor 27 for carriage movement, gear train 28
And are unitized together with the base block 24. Both sides of each base block 24 are supported on the chassis 14 by the adjustment mechanism 40 according to the present invention so that the posture can be adjusted. As shown in FIG. 3, the adjustment mechanism 40 includes an inner plate 42 supporting the base block 24, an outer plate 44 fixed to the chassis 14, and a first plate disposed between the inner plate 42 and the outer plate 44. Plate 46
And a second plate 48.

As shown in FIG. 4, the inner plate 42 has a bottom surface 4 which faces below the bottom surface of the base block 24.
202 and two side surfaces 4204 that stand on both sides of the bottom surface 4202 and face the side surfaces of the base block 24 located outside the two slide shafts 26. The side surface 4204 extends in parallel with the slide shaft 26, and therefore extends in a direction parallel to the moving direction of the optical pickup 20 and the carriage 22 (radial direction of the optical disk). A side surface 42 is provided on an upper outer surface of the both side surfaces 4204.
Two adjusting shafts 50 are provided projecting from each other at intervals in the direction in which the 04 extends. The base block 24 is attached to the inner plate 42 with its four corners fastened to the bottom surface 4202 by screws 52 and sandwiched between the side surfaces 4204 on both sides.

The outer plate 44 is located outside of each side surface 4204 of the inner plate 42 in parallel with the side surface 4204 so as to be positioned on the chassis 1 by screws (not shown).
Attach to 4. As shown in FIG. 5, the second plate 48 has two screws 5202, two long holes 5204,
The outer plate 44 through the three screw holes 5206.
It is attached to the inner surface of the first member so that the position can be adjusted within the range of the long hole 5204.

A pin 5402 projecting from the inner surface of the outer plate 44 is rotatably coupled to a swing center hole 5404 at the end of the second plate 48 near the spindle motor 16. Therefore, an eccentric pin 5602 including a large-diameter shaft portion 5602A and a small-diameter shaft portion 5602B, whose axes are eccentric with each other, is prepared, and the screw 5202 is loosened to allow the eccentric pin 5602 from outside the outer plate 44.
The large diameter portion 5602A of the outer plate 44
04 and the small-diameter portion 5602B through the swing center hole 54.
04 into a swing hole 5606 located at a position further from the spindle motor 16 than the eccentric pin 5602
Is rotated, the second plate 48 is moved to the swing center hole 540.
4 and swings in the direction of the arrow θ.

As shown in FIG. 6, the first plate 46
Is attached to the inner surface of the second plate 44 via two screws 5802, two long holes 5804, and two screw holes 5806 so as to be position-adjustable within the range of the long holes 5804. The screw 5802 can be operated from the outside of the outer plate 44 via a long hole 5808. At the upper edge of the first plate 46, two mounting portions 4602 are provided at intervals in the longitudinal direction of the first plate 46, and the mounting portion 4602 is located above the upper edge of the first plate 46. At a position where the first plate 46 extends, the first plate 46 extends a predetermined length in the extending direction. Also, two shafts 6002 are provided on the outer surface of the first plate 46 at intervals in the longitudinal direction of the first plate 46.
These shafts 6002 are inserted into long holes 6004 formed in the second plate 48, respectively.
2 are movably coupled along the slot 6004.

The elongated hole 6004 is formed to be inclined with respect to a horizontal plane (the surface of the optical disk mounted on the turntable), and has the same inclination as the elongated hole 5804. Therefore, the eccentric pin 5602 is prepared and the screw 580 is provided.
2 and eccentric pin 5 from outside of outer plate 44
When the large diameter portion 5602A of 602 is passed through the hole 6202 of the outer plate 44 and the long hole 6204 of the second plate 48, the small diameter portion 5602B is inserted into the hole 6206 of the first plate 46, and the eccentric pin 5602 is rotated. Hole 6004
The shaft 6002 moves inside, and the first plate 46 linearly moves in the direction of arrow T (the direction of inclination of the long hole 6004).

Next, the assembly of the optical disk device 12 will be described. The base block 24 is attached to the outside of each side surface 4204 of the inner plate 42 to which the base block 24 is attached.
The outer plate 44 is fixed to the chassis 1 by screws (not shown).
4 and the inner surface of the outer plate 44
The plate 48 is attached by two screws 5202, and the first plate 46 is attached to the inner surface of the second plate 48 by two screws 5802. And the chassis 14
The inner plate 42 to which the base block 24 is attached is inserted between the first plates 46 opposed to each other above, and the adjustment shafts 50 of the inner plate 42 are respectively mounted on the two mounting portions 4602 of the first plate 46. Is placed.

In this state, the tips of the two adjusting shafts 50 are inserted into two upper open notches 64 provided on the outer plate 44 as shown in FIG. Spindle motor 1 out of two notches 64
A narrow portion 6402 is formed below the notch 64 on the sixth side, and the tip of the adjustment shaft 50 is inserted into the narrow portion 6402, so that the inner plate 42 is attached to the spindle motor 1.
6, the base block 24 is positioned in the radial direction of the spindle motor 16. The notch 64 of the two notches 64 on the side remote from the spindle motor 16 is formed with a width slightly larger than the diameter of the adjustment shaft 50, and the swing center hole 54.
The inner plate 42 is configured to be able to swing about the center 04.

In a state in which the tips of the two adjustment shafts 50 are inserted into the notches 64, the tips of the adjustment shafts 50 are pressed down by the locking claws 66, respectively. . The locking claw 66 is disposed on the inner surface of the outer plate 44, is always exposed in the notch 64 by a spring (not shown), and is urged to press the adjustment shaft 50 downward. The locking pawl 66 is disposed so as to be able to swing up and down within the notch 64, but the upward swing range is regulated by a stopper (not shown), and is always located within the notch 64. The adjustment shaft 50 is prevented from coming off the notch 64. The locking claw 66 can be retracted out of the notch 64 by applying a lateral force to the locking claw 66. Therefore, the adjustment shaft 5
Numeral 0 is pressed onto the mounting portion 4602 by the locking claws 66, whereby the base block 24 is immovable up and down, and the base block 24 is positioned in the axial direction (the height H direction) of the spindle motor 16.

Next, the adjustment work of the optical disk device 12 will be described. First, the adjustment of the radial skew (θR) will be described. As shown in FIG. 5, first, the screw 5202 is loosened, and the outer plate 44 is loosened.
Of the second plate 48 is loosened. next,
The small-diameter portion 5602B of the eccentric pin 5602 such as an eccentric driver is inserted from the outside of the outer plate 44 into the swing hole 5606 of the second plate 48 through the long hole 5604 of the outer plate 44. Next, the eccentric pin 5602
Is rotated, the second plate 48 is moved to the swing center hole 540.
4 and swings in the direction of the arrow θ.

At this time, since the first plate 46 and the second plate 48 are fixed by the screws 5802, the first plate 46 and the second plate 48 are fixed.
The plate 46 also swings about the swing center hole 5404. Therefore, the adjustment shaft 50 held by the mounting portion 4602 of the first plate 46 and the locking claw 66, that is, the base block 20, also swings the swing center hole 5404. Swinging up and down around the center. This adjustment work is performed as shown in FIG.
The adjustment is performed for the adjustment mechanisms 40 on both sides with the disk mounting surface of the turntable 18 as a reference plane, thereby adjusting the radial skew (θR). After adjustment,
The screw 5202 is tightened, and the adjustment operation ends.

Next, tangential (tangent)
ial) Adjustment of skew (θT) and height (H) will be described. As shown in FIG. 5, first, a screw 5802 is inserted from the outside of the outer plate 44 through a long hole 5808.
And the connection state of the first plate 46 to the second plate 48 is loosened. Next, the small-diameter portion 5602B of the eccentric pin 5602 such as an eccentric driver is inserted from the outside of the outer plate 44 through the hole 6202 of the outer plate 44 and the long hole 6204 of the second plate 48 to thereby form the first plate 4
When the eccentric pin 5602 is rotated by rotating the eccentric pin 5602, the shaft 6002 moves in the elongated hole 6004, and the first plate 46 linearly moves in the direction of arrow T (inclination direction of the elongated hole 6004).

The tip of the adjusting shaft 50 is inserted into the narrow portion 6402 of the notch 64 of the outer plate 44, so that the inner plate 42 and the base block 24 cannot move on the chassis 14 in the radial direction of the spindle motor 16. When the first plate 46 linearly moves in the direction of arrow T (inclination direction of the long hole 6004), the height of the two mounting portions 4602 changes, and as a result, the locking claws 66
The height of the adjustment shaft 50 pressed on the mounting portion 4602, that is, the height of the inner plate 42 and the base block 24 changes, and the inclination corresponding to the difference from the adjustment shaft 50 of the adjustment mechanism 40 on the opposite side. Can be applied to the inner plate 42 and the base block 24, whereby the tangential skew (θT) is adjusted. Further, such adjustment is performed by the adjustment mechanisms on both sides, so that the inner plate 42 and the base block 24 are attached to the chassis 1.
4, and the height (H) is adjusted. The adjustment of the tangential skew (θT) and the height (H) is performed using the disk mounting surface of the turntable 18 as a reference plane. After the adjustment, the screw 5802 is tightened.
Finish the adjustment work.

In this embodiment, the spindle motor 16
To the chassis 14 and the optical pickup 20
, A slide shaft 26 for guiding the carriage 22, a pinion 30, and a rack 3
2, a gear train 28 connected to the carriage 22 via
Since the drive motor 27 for rotating the gear train 28 and the drive motor 27 are all disposed on the base block 24 and the posture of the base block 24 with respect to the chassis 14 is adjusted by the adjustment mechanism 40, the turntable 18 itself has an error. Even if the gear is engaged, the engagement accuracy of the pinion rack mechanism is not changed, and therefore, the driving means (the driving motor 27, the gear train 28, the pinion 3
0, the skew adjustment and the height adjustment of the optical pickup 20 can be easily performed without impairing the performance and the life of the rack 32). Also, a spindle motor 16 and
Since the base block 24 is separated and assembled separately to the chassis 14, the base block 24 and the adjustment mechanism 40 can be shared by each channel in the case of a multi-channel as in the embodiment, thereby reducing costs. The above is advantageous. In addition, when the optical pickup 20 and the driving means (the driving motor 27, the gear train 28, the pinion 30, the rack 32) are defective, the entire base block 24 can be easily replaced, which is advantageous in simplifying the repair work. Becomes

The adjusting mechanism 40 for adjusting the attitude of the base block 24 with respect to the chassis 14 may have various structures, and the present invention is not limited to the structure of the adjusting mechanism 40 described in the embodiment. However, if the adjusting mechanism 40 is provided on each side of the base block 24 as in the embodiment, the structure of the adjusting mechanism 40 is simplified as in the embodiment, and the skew (θT) adjustment and height (H) It is advantageous that the adjustment can be easily performed by a tool such as an eccentric driver. Further, the optical disk device to which the present invention is applied is naturally applied to an apparatus using a carriage driving unit of a type other than the pinion rack mechanism.

[0026]

As described above, according to the present invention, the spindle motor for driving the optical disk to rotate is supported by the chassis, the guide mechanism and the driving means of the carriage on which the optical pickup is mounted are supported by the base block, and An adjustment mechanism for adjusting the posture of the base block is provided. Therefore, even if the turntable itself has an error, or if the drive system of the carriage uses a pinion rack mechanism,
The skew adjustment and the height adjustment of the optical pickup can be easily performed without changing the engagement accuracy of the rack mechanism.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory diagrams of an adjustment mechanism in an optical disk device.

FIG. 2 is a perspective view of an optical disk device.

FIG. 3 is an exploded perspective view of an adjustment mechanism.

FIG. 4 is a perspective view for explaining attachment of an inner plate to a base block.

FIG. 5 is an exploded perspective view of the adjustment mechanism.

FIG. 6 is an exploded perspective view of the adjustment mechanism.

FIG. 7 is an explanatory view of a conventional carriage driving unit.

[Explanation of symbols]

12 ... optical disk device, 14 ... chassis, 16 ...
Spindle motor, 18 ... turntable, 20 ...
Optical pickup, 22 Carriage, 26 Slide shaft, 27 Drive motor, 30 Pinion, 32
... Rack, 40 adjustment mechanism, 42 inner plate, 44 outer plate, 46 first plate, 48 second plate.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Koji Suzuki, Inventor 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D068 AA02 BB01 CC02 EE05 EE15 GG01 GG11 5D117 AA02 CC07 JJ11 JJ12 KK08 KK11 KK20

Claims (8)

[Claims] A spindle motor disposed on a chassis for driving an optical disk to rotate; a base block facing the spindle motor and disposed on the chassis; a carriage on which an optical pickup is mounted; An optical disc device for recording / reproducing information on / from an optical disc, comprising: a guide mechanism for supporting the carriage so as to be movable in a radial direction of the optical disc; and a driving means for moving the carriage. An adjusting mechanism for supporting the guide mechanism and the driving means on a base block, and an adjusting mechanism for adjusting a posture of the base block with respect to the chassis. 2. The method according to claim 1, wherein the adjustment of the posture of the base block is performed by swinging the base block up and down on the chassis and moving the base block away from and approaching the chassis. Item 3. An adjustment mechanism in the optical disk device according to Item 1. 3. The adjusting mechanism according to claim 1, wherein the adjusting mechanism is provided on both sides of the base block. 4. The adjustment mechanism has an inner plate to which a base block is fixed, and the adjustment of the posture of the base block by the adjustment mechanism swings the inner plate up and down, and attaches the inner plate to a chassis. 4. The adjusting mechanism according to claim 3, wherein the adjusting mechanism is performed by moving the optical disc apparatus away from the optical disc apparatus. 5. The adjusting mechanism has an inner plate to which a base block is fixed, and the inner plate has side surfaces facing both sides of the base block, and each side surface extends in a direction away from the base block. Two adjusting shafts that protrude are provided, and the adjusting mechanism has an outer plate facing the outside of the side surface of the inner plate and attached to a chassis, and the adjusting shaft moves in a radial direction of the optical disk by the outer plate. Supported by impossibility,
4. The adjusting mechanism according to claim 3, wherein the vertical swing and the separation approaching movement of the base block by the adjusting mechanism are performed via the adjusting shaft. 6. The two base blocks are provided with the spindle motor interposed therebetween, and the adjusting mechanisms are provided on both sides of the two base blocks, respectively. 6. The adjusting mechanism according to claim 5, wherein the adjusting mechanism is formed of one member. 7. The optical disk according to claim 1, wherein said drive means comprises a drive motor, a pinion rotated by the drive motor, and a rack provided on a carriage and meshing with the pinion. Adjustment mechanism in the device. 8. The adjusting mechanism according to claim 1, wherein the base block is supported on a chassis by the adjusting mechanism.