JP2002312951A - Optical disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk unit, in which the skew and height of an optical pickup are adjustable with a simple constitution without increasing the maintenance cost. SOLUTION: An adjusting plate 36 is fixed onto the inner surface of the side plate 3004 of a slide plate 30 through screws N1. A cam plate 34 is fixed on the inner surface of the adjusting plate 36 through screws N2. Cam shafts 42 of a base block 20 are inserted to cam grooves 3410 of the cam plate 34. When the screws N1 are loosened to swing the adjusting plate 36 and the cam plate 34 around a supporting shaft 3602, the adjustment in the radial direction is made. When the screws N2 are loosened to move the cam plate 34 to the direction of Z axis, the adjustment of the base block 20 in the Tangential direction is made, and the height of the base block 20 is adjusted by adjusting also the opposite side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive, and more particularly, to an optical disk drive capable of easily adjusting the skew and height of an optical pickup.

[0002]

2. Description of the Related Art In an optical disk apparatus for recording / reproducing information on / from an optical disk such as a CD or DVD (in other words, recording information on an optical disk, or reproducing recorded information, or recording / reproducing). In general, the angle at which a laser beam is applied to an optical disc through an objective lens and the distance between the optical disc and the objective lens are very important factors. In order to achieve these precisions, processing techniques are difficult, and adjustments are required. In this case, as a conventional general method, there is an adjustment method by tilting two guide shafts for guiding a moving block in which an optical pickup is incorporated. This is because if there is only one optical system, it is integrated with the spindle motor, and if it is adjusted for the surface on which the optical disk is mounted, the moving block and the spindle motor are exchanged as a single unit, so that maintenance outside the factory is no problem. Done.

[0003]

However, such a conventional method has the following disadvantages. The two guide shafts should be parallel in nature, and the above adjustment may cause the two guide shafts to be adjusted in a twisted relationship, increasing the load on the sliding operation of the moving block. . Replacement with the spindle motor is required, which increases maintenance costs. When a plurality of moving blocks are mounted, even if one optical system fails, it is necessary to replace the plurality of moving blocks and the spindle motor collectively and integrally, which is very disadvantageous in terms of cost (adjustment of each unit). Requires expensive measuring instruments and is difficult in the field). When the moving block is moved by the rack and the pinion, the angle of engagement between the rack and the pinion changes due to the adjustment of the inclination of the guide shaft, and the load increases. In the case of an optical structure called a separation optical system, the laser part is divided into a fixed part and the objective part is divided into a moving part, and the optical axis must not be deviated, but the optical axis is shifted by adjusting the above guide axis. .

[0004] The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a simple configuration, without increasing maintenance costs, and further hindering the sliding operation of the moving block. It is an object of the present invention to provide an optical disk device capable of adjusting the skew and height of an optical pickup without causing a problem.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a spindle motor provided on a base for rotating an optical disk, and a base block provided on the base so as to face the spindle motor. A moving block in which an optical pickup is incorporated; and an optical disc apparatus for moving the moving block on the base block in the Y-axis direction, which is the radial direction of the optical disc, to perform recording / reproduction on the optical disc. . In the present invention, the base block is spaced on both sides in the Y-axis direction on both sides of the base block in the X-axis direction which is a direction orthogonal to both the Z-axis direction and the Y-axis direction of the optical disc. Two cam shafts protruding in the X-axis direction are provided, cam plates are provided on both sides of the base block, and an adjustment plate is provided facing the cam plate. The adjustment plate is provided in the X-axis direction. The cam plate is supported on the base side so as to be capable of swing adjustment via a support shaft extending to the base plate, the cam plate is coupled to the adjustment plate so as to be movable and adjustable in the Z-axis direction, and the cam shafts are provided on both sides of the base block. The base block is positioned in the Z-axis direction and is supported on the base by being inserted into the cam groove of the formed cam plate.

According to the present invention, when the adjusting plate and the cam plate are swung about the support shaft, the base block is adjusted in the radial direction, and when the cam plate is moved in the Z-axis direction, the tang of the base block is changed.
When the adjustment in the initial direction is performed, and the cam plate on the opposite side is also moved in the Z-axis direction, the height of the base block is adjusted.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view of an optical disk device, FIG. 2 is an exploded perspective view of an elevating mechanism, FIG. 3 is an exploded perspective view of a base block and a base holder, FIG. 4 is an exploded perspective view of an elevating mechanism, and FIG. FIG. 6 is a perspective view of a main part of the elevating mechanism in a state where the base block is located in the operating position, and FIG. 7 is a perspective view of a main part of the elevating mechanism in a state where the base block is located in the retracted position. FIG. 8 is an enlarged perspective view of the lock arm portion in a state where the base block is located at the operating position, and FIG. 9A is a plan view of the slide plate and the outer plate portion. FIG. 2B shows the front view.
As shown in FIG. 1, 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 base 14, and a turntable 18 provided above an output shaft of the spindle motor 16. ing.
On both sides of the spindle motor 16 on the base 14,
As shown in FIG. 2 and FIG.
Are disposed via a base holder 22, and each base block 20 is provided with a moving block 24 in which an optical pickup is incorporated. In the drawing, as shown by three axes XYZ, the radial direction of the optical disk mounted on the turntable 18 is the Y-axis direction, the axial direction of the optical disk is the Z-axis direction, and the optical disk is orthogonal to the axial direction and the radial direction. Is the X-axis direction (the width direction of the moving block 24).

Each base block 20 is provided with two slide shafts 26 in a direction parallel to the Y-axis direction. As shown in FIG. 3, a bearing 2402 of the moving block 24 is slidable on the slide shafts 26. Mating, each moving block 24
Are movably disposed along two slide shafts 26. The movement of each moving block 24 is performed by a motor mounted on each base block 20, a gear mechanism 2002 provided on the base block 20 and rotated by the power of the motor, and meshed with the gear mechanism 2002 provided on a side portion of the moving block 24. The movement is performed via a rack 2404, whereby each moving block 24 is configured to move along the radial direction of the optical disk mounted on the turntable 18, that is, along the Y-axis direction. In the present embodiment,
A moving mechanism 24A for moving the moving block 24 in the radial direction of the optical disk is constituted by the motor, the gear mechanism 2002, the rack 2404, and the like. All the members constituting the moving mechanism 24A are incorporated on the base block 20. In the present embodiment, the moving block 24 is constituted by a housing of an optical pickup.
Are provided with a laser diode, an optical system that guides light emitted from the laser diode to the optical disk, an objective lens 2406 that forms a part of the optical system, an optical system that guides reflected light from the optical disk to a light receiving element, and the like. , In the figure, reference numeral 24
Reference numeral 08 denotes a two-axis device for adjusting the positions of the objective lens 2406 in the height direction (Z-axis direction) and the radial direction of the optical disc (Y-axis direction).

In this embodiment, in FIG. 1, the optical pickup incorporated in the left moving block 24 is always used, whereas the right moving block 24 is moved to the optical disk by the lifting mechanism 28. Record /
It is configured to move up and down in the Z-axis direction between an operation position for performing reproduction and a retreat position separated from the optical disk. The lifting mechanism 28 includes a base holder 22, a slide plate 30, and an outer plate 3, as shown in FIGS.
2, cam plate 34, adjustment plate 36, moving mechanism 3
8 and the like.

As shown in FIG. 3, the base holder 22 has a bottom surface 2 to which the base block 20 is fixed by screws.
202 and a side surface 2204 sandwiching both sides in the width direction of the base block 20. One guide shaft 40 and two cam shafts 42 are projected from each side surface 2204 of the base holder 22 in parallel with the X-axis direction, and one side surface 2204 is parallel to the Y-axis direction. A positioning leaf spring 44 (positioning spring) is attached. Note that annular bearings 4002 and 4202 are fitted to the guide shaft 40 and the cam shaft 42, respectively. In addition, at both ends of each side surface 2204 of the base holder 22 in the Y-axis direction,
A positioning piece 2210 (positioning portion) is provided, which stands at a right angle from the bottom surface 2202 and has an upper portion inclined inward.

As shown in FIG. 2, the slide plate 30 has a bottom surface 3002 and side surfaces 3004 standing upright from both sides of the bottom surface 3002. The bottom surface 3002 is
The pin 1402 provided on the base 14 is disposed below the bottom surface 2202 of the base holder 22 on the base 14 and engages with the long groove of the bottom surface 3002, whereby the slide plate 30 is disposed so as to be movable in the Y-axis direction. The movement of the slide plate 30 is performed by the moving mechanism 38.

As shown in FIG.
And the adjustment plate 36 are connected to the side surface 220 of the base holder 22.
4 and the side plate 3004 of the slide plate 30, and the outer plate 32 is
Is attached to the base 14 with a screw (not shown) so as to reach the outside of the side surface 3004 of the base. Each outer plate 32 has a guide groove 3202 which is open upward and extends in the Z-axis direction.
As shown in FIGS. 2, 7, and 8, a limiter arm 3250, a limiter spring 3252, and a lock arm 3254 are provided on the inner surface of each outer plate 32 so as to face the guide groove 3202. 3256
Are the limiter arm 3250 and the lock arm 325
7 and 8, reference numeral 3258 denotes a limiter pin implanted in the limiter arm 3250. In addition, as shown in FIGS.
52 is a spring 32 stretched between the outer plate 32
It is always urged upward by 59. Also, as shown in FIGS. 2, 9A and 9B, each outer plate 32
Are provided with two positioning pins 3260 (positioning portions) that can contact the positioning pieces 2210 of the base holder 22, and one of the four positioning pins 3260 of each outer plate 32 is fixed. The other three are configured so that the protrusion height can be adjusted by loosening and tightening the screws.

As shown in FIG.
The screw N 1, the long grooves 3012, 3014, and the screw hole 36 in a state where the support shaft 3602 protruding in the X-axis direction is
04 is attached to the inner surface of the side plate 3004. The guide pin 3402 of the cam plate 34 is inserted into the long groove 3606 of the adjustment plate 36, and the adjustment plate 36
The screw N2 is screwed into the screw hole 3404 of the cam plate 34 through the long groove 3608 from the outside, and is attached to the inner surface of the adjustment plate 36. Then, the base holder 22
Is inserted into the guide groove 3202 of the outer plate 32 via the bearing 4002, whereby the base block 20 is supported so as to be movable only in the Z-axis direction, and the cam shaft 42 of the base holder 22 is mounted on the bearing 4202. The cam block 34 is inserted into the cam groove 3410 of the cam plate 34 through the, so that the cam block 34 moves in the Y-axis direction, so that the base block 20 moves up and down.

As described above, the side surface 3 of the slide plate 30
In the state where the adjustment plate 36 is attached to the inner surface of the outer plate 32 and the cam plate 34 is attached to the inner surface of the adjustment plate 36, the large-diameter hole 3020 of the side surface 3004 of the slide plate 30 is inserted into the long hole 3210 of the outer plate 32. Are located, and the adjustment hole 3620 of the adjustment plate 36 is located in the large diameter hole 3020.

The side surface 300 of the slide plate 30
In the state where the adjustment plate 36 is attached to the inner surface of the slide plate 30 and the cam plate 34 is attached to the inner surface of the adjustment plate 36, the large-diameter hole 3022 of the side surface 3004 of the slide plate 30 is inserted into the long hole 3212 of the outer plate 32. Are located, the hole 3622 of the adjustment plate 36 is located in the large diameter hole 3022, and the adjustment hole 3420 of the cam plate 34 is located in the hole 3622 of the adjustment plate 36.

The movement of the slide plate 30 is performed by a moving mechanism 38. The moving mechanism 38 includes a load motor 3 provided on a base 14 as shown in FIG.
802, a worm gear 3804 rotationally driven by a load motor 3802, a worm wheel 3806 meshing with the worm gear 3804, and a worm wheel 3806
A load gear 3808 meshing with a gear that rotates integrally with
A load arm 3812 having the same rotation center as the load gear 3808 and connected to the load gear 3808 via a load limiter spring 3810, and a slide link 3814 connecting the load arm 3812 and the slide plate 30.
It is composed of Both ends of the slide link 3814 are pin-connected to the base of the load arm 3812 and the slide plate 30, respectively.
The end connected to the load arm 3812 has a curved portion 38.
14A (see FIG. 6 (B)), and is configured such that a large force is exerted with a smaller force on the toggle mechanism.

FIG. 5 shows a state in which the moving block 24 has been lowered to the retracted position, FIG. 6 shows a state in which the moving block 24 has been raised to the operating position, and when the load motor 3802 rotates forward from the state shown in FIG. The load arm 3812 is normally rotated via the worm gear 3804, the worm wheel 3806, the load gear 3808, and the load limiter spring 3810, and the slide link 3814 is drawn, so that the slide plate 30 is drawn. Moving, camshaft 4
2. The moving block 24 is raised to the operating position via the cam groove 3410. Then, in a state where the moving block 24 is raised to the operating position, as shown in FIG. 6B, the distal end of the curved portion 3814A where the load arm 3812 and the slide link 3814 are joined together has the load arm 381.
Over the dead center D beyond the center of rotation 2 and the curved portion 3814A
The rotation shaft 3812A of the load arm 3812 abuts on the inside, the slide link 3814 stops, and the load arm 3812 also stops. However, the load gear 3808 further rotates and stops after the load limiter spring 3810 expands. The function of the load limiter spring 3810 prevents the worm gear 3804 from biting.

When the moving block 24 is raised to the operating position, the bending portion 381 of the slide link 3814
Since the tip of 4A crosses over the dead center D beyond the rotation center of the load arm 3812, and the rotation axis of the load arm 3812 abuts inside the curved portion 3814A, the slide plate 30 moves in the opposite direction due to vibration or the like. Is prevented. When the moving block 24 is lowered from the operating position to the retreat position, the load motor 3802 is moved from the state shown in FIG.
, The load gear 3808 and the load arm 3812 rotate together as a unit, and the slide link 3
When the slide plate 30 is pushed out by pushing the 814, the cam plate 34 moves integrally with the slide plate 30, and the moving block 24 is lowered to the retreat position via the cam shaft 42 and the cam groove 3410.

In this case, the stop position of the slide plate 30 is provided with a margin, and the play is stopped in the Y-axis direction by a stop limiter spring 46 (see FIG. 2) provided on the base.
Biting of the worm gear 3804 is prevented. In addition,
5 and 6, reference numeral 50 denotes a pin protruding from the load gear 3808, and reference numerals 52 and 54 denote sensor arms provided on the base 14. When the moving block 24 is located at the operating position, the sensor arm 52 is actuated by the pin 50. Is pivoted, the switch connected to the sensor arm 52 is operated, and when the moving block 24 is located at the retracted position, the pin 50 is moved.
The sensor arm 54 is swung by the
Is configured to operate.

Next, the operation of the lifting mechanism 28 will be described. First, as shown in FIG.
When the base holder 22 and the moving block 24 are lowered to the retracted position, the slide plate 30 and the cam plate 3
4. The adjustment plate 36 is located at a position farthest from the spindle motor 16. Since the base block 20, the base holder 22, and the moving block 24 are integrally moved by the elevating mechanism 28, the base block 20, the base holder 2
2. The base block 20 of the moving block 24 will be described. As shown in FIGS. 5 and 7, the cam groove 3410 is formed so as to be displaced in the Z-axis direction while extending in the Y-axis direction, and when the base block 20 is lowered to the retracted position, the cam shaft 42 Lower part 3410 of cam groove 3410
A is located. The positioning pins 3260 of each outer plate 32 are positioned on the positioning pieces 22 of the base holder 22.
10 is located above. Further, the tip of the positioning leaf spring 44 of the base holder 22 is located within the notch 3430 of the cam plate 34 as shown in FIG.
5 and 7, the biasing force of the spring 3259 acts on the limiter arm 3250 via the lock arm 3252 and the limiter spring 3252. As a result, the lock arm 3250 is located at a position diagonally above the guide shaft 40.

When the slide plate 30 is pulled toward the spindle motor 16 by the moving mechanism 38 from the retracted position, the cam plate 34 and the adjustment plate 36 move integrally with the slide plate 30 and the cam shaft 42
From the lower part 3410A of the cam groove 3410 to the inclined part 341
0B, and the base block 20 is supported so that the guide shaft 40 is engaged with the guide groove 3202 and can move only in the Y-axis direction. It gradually rises while maintaining a parallel state. Further slide plate 3
By the movement of 0, the camshaft 42 moves from the inclined portion 3410B of the cam groove 3410 to the upper portion 3410C, and the base block 20 becomes the operating position. Immediately before the cam shaft 42 reaches the upper portion 3410C from the inclined portion 3410B of the cam groove 3410, that is, immediately before the base block 20 reaches the operating position, the positioning pins 32 of the outer plates 32 are moved.
Between 60, the positioning piece 2210 of the base holder 22 (the portion that stands upright from the bottom surface 2202) is located from the inclined portion.

At substantially the same time, the leading end of the positioning leaf spring 44 comes into contact with the inner surface (contact portion) of the cam plate 34 forming the side of the notch 3430, and the positioning spring 44 is formed. By the force, the positioning pin 32
The positioning piece 2210 of the base holder 22 comes into contact with the two positioning pins 3260 on the side provided with 60, and the backlash of the base block 20 in the X-axis direction is removed to perform positioning. Also, as shown in FIG. 8, the limiter pin 3258 contacts the upper edge 3030 of the side surface 3004 of the slide plate 30 to the vertical edge 3032 (engagement portion) to swing the limiter arm 3250, and the limiter spring 3252
, The lock arm 3254 swings.

Then, the lock arm 3254 presses the guide shaft 40 from the direction of 45 degrees with respect to the extending direction of the guide groove 3202 on the YZ plane. Due to the force F1 of the lock arm 3254 pressing the guide shaft 40 obliquely, the guide shaft 40 is pressed against the edge of the guide groove 3202 on the side away from the spindle motor 16 by the component force F2,
The backlash in the Y-axis direction is removed, and the Y of the base block 20 is removed.
Axial positioning is performed. In addition, the lock arm 32
The cam shaft 42 is pressed against the lower edge of the upper portion 3410C of the cam groove 3410 by the component force F3 by the force F1 that presses the guide shaft 40 obliquely, so that the backlash in the Z-axis direction is removed and the base block is removed. Positioning in the Z-axis direction is performed.

Next, adjustment of the skew and height of the optical pickup will be described. Adjustment in Radial direction Loosen the left and right screws N1 and N1 from the long holes 3212 and 3214 of the outer plate 32 outside the outer plate 32. An eccentric driver having a small-diameter cylindrical portion projecting from a center of the end face of the large-diameter cylindrical portion is prepared. Large diameter hole 30
20, the small-diameter cylindrical portion is inserted into the adjustment hole 3620 of the adjustment plate 36, and the eccentric driver is rotated. By this rotation, the adjustment plate 36 and the cam plate 34
Swings about the support shaft 3602, and swings the adjustment plate 36 and the cam plate 34 on the opposite side to adjust the base block 20 in the radial direction.

Adjustment in the Tangential direction and height adjustment The left and right screws N2, N2 are loosened from the long holes 3212, 3214 of the outer plate 32 outside the outer plate 32. The large-diameter cylindrical portion of the eccentric driver is connected to the long hole 3212 of the outer plate 32 and the large-diameter hole 3022 of the slide plate 30.
Through the hole 3622 of the adjustment plate 36, and the small-diameter cylindrical portion is inserted into the adjustment hole 3420 of the cam plate 34,
Rotate the eccentric driver. By this rotation, the guide pin 3402 of the cam plate 34 moves along the long groove 3606 of the adjustment plate 36, so that the cam plate 34 moves up and down, whereby the base block 20 moves up and down in the Z-axis direction. A direction adjustment is made. By adjusting the opposite side, the height of the base block 20 is adjusted (adjustment in the Z-axis direction).

According to the present embodiment, the cam plate 34
The skew and height of the optical pickup can be adjusted with a simple configuration using the and the adjustment plate 36.
In addition, since the entire base block 20 including the two slide shafts 26 and the moving mechanism 24A of the moving block 24 is moved, there is a problem that the two guide shafts are twisted as in the related art, and the rack and the pinion are not used. The skew and the height can be reliably adjusted without causing a problem that the engagement angle changes, and even in the case of an optical structure called a separation optical system, the optical axis does not shift. . Further, even if the optical disk device includes a plurality of moving blocks 24 and one of the moving blocks 24 fails, it is sufficient to replace only the moving block 24, which is advantageous in cost.

In this embodiment, the description has been given of the case of the optical disk apparatus in which the base block 20 is moved up and down by moving the base block 20 in parallel. However, the present invention is also applied to the optical disk apparatus of the system in which the base block 20 is swung up and down. Of course it applies.

[0028]

According to the present invention as described above,
An optical disk device that can adjust the skew and height of the optical pickup with a simple configuration and without increasing maintenance costs and without hindering the sliding operation of the moving block can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an optical disk device.

FIG. 2 is an exploded perspective view of a lifting mechanism.

FIG. 3 is an exploded perspective view of a base block and a base holder.

FIG. 4 is an exploded perspective view of a lifting mechanism.

FIG. 5 is a perspective view of a main part of the lifting mechanism in a state where the base block is located at a retracted position.

FIG. 6 is a perspective view of a main part of the elevating mechanism in a state where the base block is located at the operating position.

FIG. 7 is an enlarged perspective view of a lock arm portion in a state where a base block is located at a retracted position.

FIG. 8 is an enlarged perspective view of a lock arm portion in a state where a base block is located at an operation position.

FIG. 9A is a plan view of a slide plate and an outer plate portion, and FIG. 9B is a front view of the same.

[Explanation of symbols]

12 optical disk drive, 14 base, 16 spindle motor, 20 base block, 22 base holder, 30 slide plate, 32 outer plate, 3254 lock arm, 34 Cam plate, 36 adjustment plate, 40 guide shaft,
42 ... Cam shaft.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D117 CC07 JJ01 KK08 KK11

Claims (5)

[Claims] 1. A spindle motor disposed on a base for rotating and driving an optical disk; a base block disposed on the base so as to face the spindle motor; a moving block incorporating an optical pickup; In the optical disc apparatus for moving the moving block in the Y-axis direction, which is the radial direction of the optical disc, to perform recording / reproducing on the optical disc, the optical disc apparatus may include both the Z-axis direction, which is the axial direction of the optical disc, and the Y-axis direction. Two camshafts are provided on both sides of the base block in the X-axis direction, which is a direction orthogonal to the axis, and project in the X-axis direction at intervals in the Y-axis direction. A plate is provided, and an adjustment plate is provided facing the cam plate, and the adjustment plate extends in the X-axis direction. The cam plate is supported on the base side so as to be capable of swing adjustment via a supporting shaft, and the cam plate is coupled to the adjustment plate so as to be movable and adjustable in the Z-axis direction, and the cam shafts are arranged on both sides of a base block. An optical disc device, wherein the base block is positioned in the Z-axis direction and is supported on the base by being inserted into a cam groove of a plate. 2. The optical disk device according to claim 1, wherein the base block is supported by a base holder, and the cam shaft is provided on the base holder. 3. The optical disk device according to claim 1, wherein the base block is supported on the base side so as to be movable only in the Z-axis direction. 4. The optical disc device according to claim 1, wherein the base block is provided with a moving mechanism for moving the moving block in a Y-axis direction which is a radial direction of the optical disc. 5. The optical disk device according to claim 1, wherein a slide plate is provided on the base so as to be movable in a Y-axis direction, and the adjustment plate is supported by the slide plate.