JPH10134358A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk reproducing device capable of simultaneously performing normal shift correction and skew adjustment efficiently and accurately. SOLUTION: By rotating an eccentric cam 81 to slidemove an adjusting slider 82 only by a distance L1 according to the rotational angle of the eccentric cam 81, a guide shaft (main spindle) 36 is rotated around a supporting point P by a bearing 41 by a very small angle. Thus, normal shift correction is simply carried out without deforming the attaching position of a disk motor and skew adjustment is also carried out along with the normal shift correction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CD-ROM,
The present invention relates to a disk reproducing apparatus for reproducing or recording / reproducing an optical disk such as a VD.

[0002]

2. Description of the Related Art In a disk drive for reproducing an optical disk such as a compact disk and a laser disk,
When the three-beam method is adopted, the EF signal is generated by a shift (normal shift) between the feed center of the optical pickup (movement trajectory of the beam spot on the disk reflecting surface of the optical pickup) and the rotation center of the disk. In addition, the disc reading performance is deteriorated due to a phase shift of the EF signal between the inner circumference and the outer circumference of the disk. Also, the perpendicularity (skew) of the optical axis of the optical pickup with respect to the disk surface greatly affects the disk reading performance.

[0003] In particular, a digital video disk (hereinafter referred to as a DVD) known as a high-density optical disk.
Since the track pitch is as narrow as about half of that of a compact disk or a laser disk, strict accuracy is required for the coincidence and skew between the center of rotation of the optical pickup and the center of rotation of the disk.

[0004] These accuracies are determined by the accuracies of individual parts and the accuracy of assembly. However, there is a limit to the accuracy of parts and the accuracy of assembly as a matter of course. Therefore, adjustment by any method after assembling is considered as a realistic countermeasure.

As a means for performing adjustment (correction of a normal line deviation) to make the center of rotation of the optical pickup coincide with the center of rotation of the disk, there is a method of adjusting the mounting position of the disk motor using an eccentric cam. However, if the skew adjustment is performed on the support structure on the optical pickup side simultaneously with the adjustment of the mounting position of the disk motor,
Since the disk motor supporting the disk serving as a reference for the skew adjustment is not completely fixed to the chassis, it is difficult to perform the skew adjustment with high accuracy.

That is, the mounting position of the disk motor and the skew adjustment are usually alternately and repeatedly performed. Therefore, after the mounting position of the disk motor is changed, the disk motor is fixed to the chassis. Usually, it doesn't fix the disk because it takes time.

[0007]

As described above, conventionally, as a method for correcting a normal displacement for making the center of rotation of an optical pickup coincide with the center of rotation of a disk, a method of adjusting a mounting position of a disk motor is known. Was taken. However, according to this method, when skew adjustment is performed on the support structure on the optical pickup side at the same time as normal line correction, it is extremely difficult to perform the skew adjustment efficiently and accurately. was there.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a disk reproducing apparatus capable of easily correcting a normal deviation.

Another object of the present invention is to provide a disk reproducing apparatus capable of performing skew adjustment efficiently and accurately at the same time as normal line deviation correction.

[0010]

In order to achieve the above object, a disk reproducing apparatus according to the present invention has a disk reproducing apparatus which supports an optical pickup via a guide shaft so as to be freely conveyed. The apparatus is characterized in that it comprises adjusting means for adjusting the direction of the guide shaft so that the line formed by the movement locus of the optical focus on the disk surface of the optical pickup passes through the center point of the disk.

According to a second aspect of the present invention, there is provided a disk reproducing apparatus in which an optical pickup is supported so as to be able to be conveyed via two guide shafts. And an adjusting means for adjusting the direction of at least one of the guide shafts so that the line formed by the movement locus of the optical focal point passes through the center point of the disk.

Further, according to a third aspect of the present invention, there is provided a disk reproducing apparatus, comprising: a support; two guide shafts each having both ends supported by the support; And first adjusting means for individually adjusting the height of at least three of the four support points of each guide shaft from the reference surface of the support, and an optical pickup of the optical pickup. A second direction for adjusting the direction of at least one of the guide shafts such that a line formed by the movement locus of the optical focal point on the disk surface passes through the center point of the disk.
And adjusting means.

In the above invention, normal line deviation can be easily corrected without displacing the position / posture of the disk motor. Therefore, since the reference disk surface is fixed when the skew adjustment for the support structure of the optical pickup is performed in parallel with the normal line deviation correction, the skew adjustment can be performed efficiently and with high accuracy.
Further, as described in claim 4, the height of the other three support points is adjusted by the first adjusting means having the spiral cam surface with reference to the height of one support point of each guide shaft. In the case where the skew adjustment is performed, if the direction of the guide shaft is changed, the position of the cam surface on which the guide shaft is mounted may be shifted and the height of the support point may be shifted. Therefore, in this case, the direction of the guide shaft, of which the height can be adjusted only at one of the support points by the first adjusting means, of each guide shaft is changed, and the guide shaft is rotated around the support point near the one support point. It is preferable to adjust it.

In the present invention, the direction of the guide shaft is adjusted, for example, as shown in FIG. 14, by a guide shaft (guide shaft 3 in FIG. 14) that strictly defines the transport direction of the optical pickup.
Needless to say, it is only necessary to perform step 6).

According to a fifth aspect of the present invention, there is provided a disk reproducing apparatus according to any one of the first to fourth aspects, further comprising: a toothed bar provided on the optical pickup; Drive means for transporting the gears on each guide shaft, further comprising a drive means having a gear meshed with the tooth rod, and a meshing state adjusting means for adjusting the meshing state between the tooth rod and the gear. Features.

If the direction of conveyance of the optical pickup is changed by adjusting the direction of the guide shaft, the tooth stick of the optical pickup and
The distance from the gear of the pickup feed mechanism supported by the support changes, and in some cases, the meshing state of the two deteriorates. Therefore, if the meshing state adjusting means is configured to be able to adjust the meshing state between the tooth shaft and the gear, a good meshing state is always ensured.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the disk reproducing apparatus according to the present embodiment is configured such that a tray 1 on which a disk is mounted can be freely inserted into and removed from a main chassis 2 as a drive main body. Guide protrusions 1a are provided on both side surfaces of the tray 1. These guide projections 1a are fitted into guide portions 2a provided on the main chassis 2, whereby the tray 1 is guided in a linear direction parallel to the disk surface, and the tray discharge position shown in FIG. Conveyed to and from the position.

As shown in FIGS. 1 to 3, a reproducing mechanism is provided in the main chassis 2 by supporting a mechanical chassis 3 having a disk reproducing mechanism via a plurality of buffer members 4 such as a damper cushion. Unit 5 is arranged. On the mechanical chassis 3, a disk motor 13, an optical pickup 14, an optical pickup feed mechanism, and the like are mounted. The disk motor 13 is fixed on the mechanical chassis 3 via a motor mount 15. A turntable 16 is attached to a motor shaft of the disk motor 13.

As shown in FIGS. 3 and 4, rotating shafts 6 protrude from both sides on the rear side in the tray insertion direction of the reproducing mechanism unit 5, and these rotating shafts 6 are main. It is rotatably held by a shaft holder 7 (see FIGS. 1 and 2) of the chassis 2. A rotation guide shaft 8 protrudes from the surface of the reproduction mechanism unit 5 on the labor side in the tray insertion direction. The rotation guide shaft 8 is provided on a guide 9 provided on a slider 9 that slides in the depth direction in FIG. The slider 9 is inserted and held in the groove 10, and is guided in the vertical direction (the thickness direction of the disk) along the guide groove 10 as the slider 9 moves. As a result, the reproducing mechanism unit 5 is configured to tilt about the rotation shaft 6 as a fulcrum and perform disc clamping.

As shown in FIGS. 1 and 2, the main chassis 2 is provided with a clamper 1 via a clamper holder 11.
2 are held. Further, a mechanism system for tray loading and disk clamping is provided in the main chassis 2.

Next, the details of the tray loading and disc clamping mechanism and its operation will be described.

FIG. 5 shows the state when the tray is discharged, FIG. 6 shows the state when the tray loading is completed, and FIG. 7 shows the state when the disk clamp is completed.

In FIG. 5, reference numeral 21 denotes a loading motor.
The power is transmitted to the tray load gear 26 through the belt 23, the second pulley 24, and the reduction gear 25. A rack 27 provided on the tray 1 is meshed with the tray load gear 26, whereby the tray 1 is loaded in the direction of arrow X1.

A slider transport gear 28 is meshed with the tray load gear 26. However, during the loading period of the tray 1, the slider transport gear 28 is not engaged with the rack 29 of the slider 9.

As shown in FIG. 6, when the tray 1 is loaded to a predetermined position in the main chassis 2, the guide pins 31 of the slider 9 enter the guide grooves 30 provided on the back surface of the tray 1, and Guide pin 3 by 30
With the guidance of No. 1, the slider 9 slides in the arrow Y1 direction. This movement of the slider 9 causes the rack 29 of the slider 9 to mesh with the slider transport gear 28, and the slider 9 further slides in the Y1 direction by the power of the loading motor 21. At this point, the engagement between the tray load gear 26 and the rack 27 of the tray 1 is released, and the loading of the tray 1 is completed.

The movement of the slider 9 causes the rotation guide shaft 8 of the reproducing mechanism unit 5 to move as shown in FIG.
Is guided upward along the guide groove 10 of the slider 9, so that the reproducing mechanism unit 5 rotates in the direction of arrow R with the rotation shaft 6 as a fulcrum.

During the rotation of the reproducing mechanism unit 5, the disk D mounted on the tray 1 is lifted from the tray 1 by the turntable 16. Thereafter, due to the approach between the disc chuck portion 32 of the turntable 16 and the clamper 12, the disc chuck portion 32 is completely fitted into the center hole of the disc D due to the magnetic attraction force therebetween. Is completed. As shown in FIG. 7, at the time of completion of the disk clamp, the switch operation unit 33 provided at the left end of the slider 9 pushes the switch 35 to the back via the lever 34. Thus, the switch 35 detects the completion of the disk clamp and outputs a detection signal to the controller. When the controller receives the disc clamp completion detection signal, the loading motor 21
Stop driving.

The release of the disc clamp and the unloading of the tray are performed in the reverse order of the above operation by rotating the loading motor 21 in the reverse direction.

The disc reproducing apparatus is provided with a mechanism for preventing the mechanical chassis 3 supported by the reproducing mechanism unit 5 via a damper cushion from swinging when the disc is unclamped. Such a mechanism will be described with reference to FIGS. 3, 8, and 9. FIG.

The mechanical chassis 3 is provided with two guide shafts 61 and 62 for the mechanical chassis swing preventing mechanism by outsert molding or the like. The main body of the reproduction mechanism unit 5 is provided with two lock sliders 65 and 66 having guide holes 63 and 64 for engaging and guiding the guide shafts 61 and 62, respectively. One lock slider 65 is slidable in the Y-axis direction, and the other lock slider 66 is slidable in the X-axis direction.
The lock sliders 65 and 66 are connected via a connecting portion 67 and are configured to interlock with each other. Further, one lock slider 65 is urged rightward in the figure by an elastic member 68 such as a spring, and the other lock slider 66 is urged rearward in the figure. Further, one lock slider 65 is provided with a projection 70 which comes into contact with a lock slider operation section 69 provided on the slider 9 of the tray loading mechanism.

Next, the operation of the mechanical chassis swing preventing mechanism will be described.

FIG. 8 shows a state when the disk is unclamped. At this time, each of the lock sliders 65 and 66 has moved to the end in the biasing direction by the spring 68, and each of the guide shafts 61 and 62 of the mechanical chassis 3
5 and 66 are located at one end of the guide holes 63 and 64.

As shown in FIG. 10A, the guide hole 6
Each of the ends 3 and 64 has a hole 71 having a shape corresponding to the outer shape of the guide shafts 61 and 62 at one end thereof. The guide shaft 61 (62) fits into the hole 71 when the disk is unclamped. Thus, the movement of the guide shafts 61 and 62 in the X / Y-axis directions is restricted. Further, as shown in FIG. 10B, the receiving base 7 provided on one lock slider 65 at this time.
The height position of the mechanical chassis 3 on the reproducing mechanical unit 5 is kept constant by mounting the rib 73 of the one guide shaft 61 on 2. Therefore, when the disk is unclamped, the mechanical chassis 3 is fixedly held at the fixed position of the reproducing mechanical unit 5, and the mechanical chassis 3 is prevented from swinging against an externally applied impact.

After the pull-in of the tray 1 is completed, as shown in FIG. 9, when the slider 9 is further slid in the Y1 direction, the lock slider operating portion 69 of the slider 9 hits the projection 70 of one of the lock sliders 65, and this is pushed. By pressing, one lock slider 65 slides in the Y1 direction while opposing the urging force of the spring 68, and at the same time, the other lock slider 66 slides in the X2 direction. When the disk clamp is completed, the guide shafts 63 and 64 recede from the positions of the holes 71 for restricting the movement of the guide holes 63 and 64 of the lock sliders 65 and 66, and FIG.
When the rib 73 of the guide shaft 61 retreats from the receiving base 72 of the lock slider 65 as shown in (c), the swing suppression state of the mechanical chassis 3 is released.

Therefore, according to the mechanical chassis swing preventing mechanism, the mechanical chassis 3 is fixedly held at the fixed position of the reproducing mechanical unit 5 when the disk is unclamped,
Since the mechanical chassis 3 is prevented from swinging against an externally applied impact, even if an impact is applied during the movement process of the reproducing mechanism unit 5 until the disk clamp state is reached, the disk mounted on the tray 1 Of the center hole of the turntable and the centering member at the center of the turntable do not increase more than the allowable value. Therefore, even if the floating amount of the mechanical chassis 3 is increased in order to enhance the vibration absorption, a reliable disk clamp is assured.

Next, the skew adjustment mechanism of the optical pickup will be described.

As shown in FIGS. 3, 8, and 9, the optical pickup 14 is suspended between two guide shafts 35 and 36 disposed in parallel with each other, and is movably supported by these. ing. The two guide shafts 35 and 36 are supported at both ends on the mechanical chassis 3 by the following structure.

As shown in FIGS. 11 and 12, three of the four guide shafts 35 and 36 have a tilt adjusting cam 37 provided on the mechanical chassis 3 by outsert molding. Sitting on That is, as shown in FIG. 12A, both ends of one guide 35 are supported on the mechanical chassis 3 via the tilt adjusting cams 37, respectively. Also, as shown in FIG.
One end of the other guide shaft 36 has a tilt adjusting cam 3.
7, the other end is supported by a bearing 38 provided on the mechanical chassis 5 by outsert molding.

As shown in FIG. 11, a cam 39 is formed on the upper surface side of the inclination adjusting cam 37 in a spiral shape along the outer periphery. As shown in FIG. 12, in the tilt adjustment cam 37, a hexagonal hole (not shown) for adjusting a rotation angle is provided in a portion 37a protruding from the rear surface of the mechanical chassis 3, and the hexagonal hole is formed in the hexagonal hole. By inserting the bit 40 and rotating the tilt adjusting cam 37, the height of each end of the guide shafts 35 and 36 can be finely adjusted.

One of the four ends of each of the guide shafts 35 and 36 has a bearing 38 in order to set a reference height for skew adjustment using the inclination adjusting cam 37 of the other three ends. And is supported at a fixed height with respect to the mechanical chassis 3. However, the bearing 38 needs to have a bearing structure that allows the guide shaft 36 supported by the bearing 38 to change in the vertical and horizontal directions.

The movement of each of the guide shafts 35 and 36 in the Y-axis direction is restricted by a bearing 41 at a position near each of the inclination adjusting cams 37. Furthermore, each guide shaft 3
5 and 36 are elastically pressed from above by a torsion spring 42 at a position between the tilt adjusting cam 37 and the bearing 41. Thereby, the guide shafts 35 and 36 can be held at a fixed position in the height direction between the inclination adjusting cam 37 and the cam surface 39 while following the height fluctuation of the guide shafts 35 and 36.

A shaft holder 43 is detachably fixed to the upper part of the inclination adjusting cam 37 by a snap fit. The lower surface of the shaft holder 43 has a spiral cam surface 39 of the tilt adjusting cam 37 and the guide shaft 3.
They are formed so as to face each other with a gap corresponding to the diameter dimension of 5, 36 therebetween. The shaft holder 43 rotates integrally with the tilt adjustment cam 37 at the time of skew adjustment by fixing the snap fit with the tilt adjustment cam 37, and receives a strong impact due to dropping during transportation or the like, thereby causing the guide shafts 35, 36.
Therefore, even if a force is applied to the shaft holder 43 from below, the shaft holder 43 does not come off the tilt adjustment cam 37.

Here, a method of skew adjustment by the tilt adjusting cam 37 will be described. First, the three tilt adjusting cams 37 are rotated to align the guide shafts 35 and 36 in parallel with each other. Subsequently, these two guide shafts 35, 3
The tangential adjustment and the radial adjustment are performed so that the surface formed by 6 is parallel to the disk reproduction surface.

The tangential adjustment is an adjustment for making the optical axis of the optical pickup orthogonal to the disk surface when viewed from the direction of the movement locus (normal line) of the beam spot on the disk reflection surface of the optical pickup. . In this tangential adjustment, one guide shaft 35 whose height at both ends can be displaced by the tilt adjustment cam 37 is moved up and down in parallel with the other guide shaft 36, that is, each of the guide shafts 35 on both sides is guided. This can be done by rotating the tilt adjustment cams 37 in the same direction by the same amount of rotation.

The radial adjustment is an adjustment for making the optical axis of the optical pickup orthogonal to the disk surface when viewed from a direction orthogonal to the normal on the disk surface. Therefore, this radial adjustment is performed by each guide shaft 3
The rotation can be performed by rotating the inclination adjusting cams 37 at the outer peripheral end portions of the disks 5 and 36 in the same direction by the same amount of rotation.

In the disc reproducing apparatus of this embodiment, as shown in FIGS. 3, 8 and 9, the feed center of the optical pickup 14 (movement locus of the beam spot on the disc reflecting surface of the optical pickup). Deviation correcting mechanism 8 as an adjusting means for matching the rotation center of the disk with the rotation center of the disk.
0 is provided. This normal line deviation correction is performed by rotating the guide shaft (main shaft) 36 whose one end is supported by the bearing 38 at the reference height within a small angle range around the support point of the bearing 41 on the other end. It is done by moving.

8, 9, and 13, reference numeral 81 denotes an eccentric cam provided on the mechanical chassis 3 by outsert molding, and a cam surface around the eccentric cam 81 has an arrow B direction. The one end surface of the adjustment slider 82 movably provided on the front end is pressed by the force of the compression spring 83. The end of the guide shaft (main shaft) 36 projecting from the bearing 38 is restrained by the adjustment slider 82.

Here, as shown in FIGS. 12 and 13, the bearing 38 located on the inner peripheral side of the disk is a guide shaft (main shaft).
In addition to fixing the 36 support points at the reference height, the structure is provided with a structure that allows the tilt fluctuation in the up, down, left, and right directions. On the other hand, the bearing 41 on the outer peripheral side of the disk is provided with a structure that restricts the movement of the guide shaft (main shaft) 36 in the Y-axis direction at a certain point P.

A portion of the eccentric cam 81 protruding from the rear surface of the mechanical chassis is provided with a hexagonal hole for adjusting a rotation angle. Insert the hexagonal bit into this hexagonal hole and insert the eccentric cam 8
1, the adjustment slider 82 slides and moves by a distance L1 corresponding to the rotation angle of the eccentric cam 81 as shown in FIG. 13, so that the guide shaft (main shaft) 36 is supported by the bearing 41 by the support point. It rotates at a small angle about P.

By changing the inclination of the guide shaft (main shaft) 36 in this manner, adjustment (normal line deviation correction) for making the center of rotation of the optical pickup 14 coincide with the center of rotation of the disk is performed by mounting the disk motor. It can be easily performed without displacing the position. Further, since the normal line deviation can be corrected without displacing the mounting position of the disk motor, the skew adjustment can be performed in parallel with the normal line deviation correction. In the normal line deviation correction, the inclination of the other guide shaft 35 (sub-axis) does not need to be changed. That is, as shown in FIG. 14, the sectional shape of the bearing hole 84 of the sub shaft 35 in the optical pickup 14 is made to have a play in the Y-axis direction, and the difference in the orientation between the main shaft 36 and the sub shaft 35 is determined by the bearing. What is necessary is just to comprise so that absorption in the hole 84 is possible.

Next, the optical pickup feed mechanism will be described.

As shown in FIGS. 8, 9 and 14, the optical pickup feed mechanism includes a pickup feed motor 51.
A reduction gear 53 for transmitting the power of the motor 51 to a rack gear 52 fixed to the optical pickup 14;
And a lever 56 for adjusting the position of the reduction gear 54 meshed with the rack gear 52 and the pinion gear 55. Here, the shaft 54 a of the reduction gear 54 is fixed to a lever 56. The lever 56 is rotatable about a shaft 53a of the intermediate reduction gear 53 as a fulcrum, and is fixed at a fixed position after the adjustment by a screw 57.

When the feed center of the optical pickup 14 fluctuates due to the above normal line deviation correction, as shown in FIG.
The meshing state of the pinion gear 55 and the rack gear 52 fluctuates, and the two gears may not mesh properly.
In the present embodiment, the screw 57 is loosened to make the lever 56 rotatable, and the pinion gear 55 is moved to the rack gear 5.
2 can be adjusted to an optimal state.

When the rack gear 52 is moved in a direction approaching the pinion gear 55 by the above-described normal line deviation correction, if the position of the pinion gear 55 is fixed, the rack gear 52 and the pinion gear 55 strongly press each other, Although it is conceivable that a damage accident may occur, if the screw 57 is loosened before the correction of the normal deviation and the meshing state between the pinion gear 55 and the rack gear 52 is corrected after the correction of the normal deviation, the two gears can be connected to each other. It is possible to satisfactorily adjust the meshing state of both gears without pressing each other.

[0056]

As described above, according to the present invention, normal line deviation can be easily corrected without displacing the position / posture of the disk motor. Therefore, since the reference disk surface is fixed when the skew adjustment for the support structure of the optical pickup is performed in parallel with the normal line deviation correction, the skew adjustment can be performed efficiently and with high accuracy. In addition, by configuring such that the meshing state between the tooth stick of the optical pickup and the gear supported by the support can be adjusted, a good meshing state can always be ensured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a tray of a disc reproducing apparatus according to an embodiment is ejected.

FIG. 2 is a perspective view showing a state of the disk reproducing apparatus of FIG. 1 during reproduction.

FIG. 3 is an exploded perspective view showing a configuration of a reproducing mechanism unit in the disc reproducing apparatus of FIG. 1;

FIG. 4 is an internal side view of the disc reproducing apparatus of FIG. 1;

FIG. 5 is a plan view showing a state when the tray of the disc reproducing apparatus of FIG. 1 is ejected;

FIG. 6 is a plan view showing a state at the time of completion of tray loading of the disc reproducing apparatus of FIG. 1;

FIG. 7 is a plan view showing a state at the time of completion of disk clamping of the disk reproducing apparatus of FIG. 1;

FIG. 8 is a plan view showing the state of the reproducing mechanism unit when the disk is unclamped.

FIG. 9 is a plan view showing the state of the reproducing mechanism unit during disk clamping.

FIG. 10 is a diagram showing a detailed structure of a mechanical chassis swing prevention mechanism.

FIG. 11 is a perspective view showing details of a main part of a skew adjustment mechanism.

FIG. 12 is a side view of the skew adjustment mechanism for each guide shaft shown in FIG. 8;

FIG. 13 is a diagram showing details of a normal deviation correction mechanism;

FIG. 14 is a side view showing an optical pickup feeding mechanism.

FIG. 15 is a diagram illustrating adjustment of a meshing state between a rack gear and a pinion gear of the optical pickup.

[Description of Signs] 3 ... Mechanical chassis 5 ... Reproducing mechanical unit 13 ... Disc motor 14 ... Optical pickup 35, 36 ... Guide shaft 37 ... Tilt adjusting cam 38,41 ... Bearing 39 ... Tilt adjustment Spiral cam surface of cam 51 Pickup feed motor 52 Rack gears 53, 54 Reduction gear 55 Pinion gear 81 Eccentric cam 82 Adjustment slider 83 Compression spring

Claims (5)

[Claims] 1. A disc reproducing apparatus in which an optical pickup is supported so as to be able to be transported via a guide shaft, wherein a line formed by a movement locus of an optical focal point on a disk surface of the optical pickup passes through a center point of the disk. To
A disc reproducing apparatus comprising an adjusting means for adjusting the direction of the guide shaft. 2. A disc reproducing apparatus in which an optical pickup is supported so as to be able to be conveyed via two guide shafts, wherein a line formed by a movement locus of an optical focal point on a disc surface of the optical pickup corresponds to a center point of the disc. As you pass
A disc reproducing apparatus comprising an adjusting means for adjusting the direction of at least one of the guide shafts. 3. A support, two guide shafts each having both ends supported by the support, an optical pickup supported to be conveyable by each guide shaft, and four supports of each guide shaft. First adjusting means for individually adjusting the height of at least three of the support points from the reference plane of the support, and a line formed by a locus of movement of an optical focus on a disk surface of the optical pickup Passes through the center point of the disk,
A disk reproducing apparatus comprising: a second adjusting means for adjusting the direction of at least one of the guide shafts. 4. A support, two guide shafts each having both ends supported by the support, an optical pickup supported on each of the guide shafts so as to be freely conveyed, and four supports for each of the guide shafts A first for individually adjusting the height of three of the points from the reference plane of the support,
Adjusting means, which is rotatably attached to the support, supports the end of the guide shaft with a spiral cam surface, and determines the support point of the guide shaft from the support reference plane depending on the rotational position. First adjusting means configured to adjust the height, and a line formed by a movement locus of an optical focus on a disk surface of the optical pickup passes through a center point of the disk.
By rotating the guide shaft around the one support point as a fulcrum, the direction of the guide shaft in which the height adjustment of only one support point is enabled by the first adjusting means among the guide shafts is performed. A disk reproducing apparatus comprising: a second adjusting unit for adjusting. 5. The disc reproducing apparatus according to claim 1, wherein said driving means comprises: a toothed bar provided on said optical pickup; and driving means for transporting said optical pickup on each of said guide shafts. A disc reproducing apparatus further comprising: a driving unit having a gear meshed with the tooth rod; and a meshing state adjusting unit adjusting a meshing state between the tooth rod and the gear.