JP3024692U - Optical pickup drive for optical disk - Google Patents

Abstract

(57) [Summary] [Object] To provide an optical pickup drive device for an optical disc, which uses a three-beam method for tracking error detection, is inexpensive, highly accurate, and can prevent deterioration of an output signal. [Structure] A swing fulcrum 8 provided on a base 6 and a swing fulcrum 8
A swing arm 2 that swings about the center of the swing arm 2 and that holds the optical pickups 1 and 11 in a fixed manner. A flat portion 7 including the central axis of the swing arm 2 is provided near the end of the swing arm 2. On the central axis of the arm 2, the swing arm 2 provided with the corrected point 3 and the corrected point 3 with respect to the corrected point 3
Has a correction mechanism for moving on a circular arc having a radius smaller than the distance from the rocking fulcrum 8 to the rocking fulcrum 8, and a driving mechanism for rocking the rocking arm 2, and the reference line R of the lens driving unit 1 of the optical pickup. And the optical axis direction U of the optical system unit 11 form an angle of substantially 45 degrees.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a drive device for moving an optical pickup for reproducing and reading data recorded on an optical disc such as a compact disc (hereinafter referred to as a CD) along a recording surface of the optical disc. .

[0002]

[Prior art]

 In order to reproduce music and data from a record track recorded on an optical disc such as a CD, the record track must be irradiated with a laser light beam so that the center of the track coincides. As a control method for maintaining the light beam at the center position of the record track, as shown in FIG. 2, a three-beam method of irradiating the record track T0 with three beams, that is, the main beam B0 and the sub-beams B1 and B2 is used. It is common. The sub-beams B1 and B2 are used for tracking error detection, and when the position of the record track deviates from the central position T0 to the positions T1 and T2 shown by the dotted lines, the intensity of the reflected light from the sub-beams B1 and B2 is increased. Change, the beam irradiation position is controlled by detecting it.

A straight line connecting the centers of the three beams is inclined twice with respect to the center line (tangent line) of the record track, that is, the reference line of the optical pickup. In the 3-beam method, it is required to keep this tilt angle constant within an allowable range. In other words, it is necessary to match the optical pickup reference line and the tangent direction of the record track within the allowable range. For this reason, most of the three-beam type optical pickup driving devices move linearly on a linear guide. There has also been a device (Japanese Utility Model Laid-Open No. 5-33316) in which an optical pickup is rockably moved by a rocking arm.

[0004]

[Problems to be solved by the device]

 The time required to move the optical pickup from the innermost track of the CD to the outermost track was about 3 seconds for conventional music playback, but the CD-used as an external storage device of the computer. For ROM and the like, high-speed access is required, and 0.3 second or less is also required. When such high-speed access is required, the driving speed of the optical pickup also needs to be increased, and in the drive device using the linear guide, it is necessary to increase the output of the drive motor for accelerating the entire optical pickup. . In addition, the linear guide must be made with high accuracy over the entire stroke, which causes a cost increase. In addition, the signal output line connected from the optical pickup to the fixed side also needs to have a length that covers the stroke length, which may pick up noise or the like from the output signal line or adversely affect the output waveform. In the quadruple speed system in which the CD is rotated at a quadruple speed to read the data, the frequency of the data output signal is also quadrupled, and the adverse effect of the length of the output signal line becomes large.

On the other hand, a device in which an optical pickup is fixed to one end of a rotating arm and is rotated around a fulcrum of the other end of the rotating arm does not require a linear guide and can reduce the manufacturing cost. However, as shown in FIG. 3, the track D of the optical pickup is an arc centered on the fulcrum 38, and the direction of the reference line of the optical pickup should match the tangential direction of the record track at all points on this track. Is impossible. Therefore, this drive mechanism could not adopt the 3-beam method for tracking error detection. Therefore, as in Japanese Utility Model Laid-Open No. 5-33316, there has appeared a device in which the position of the fulcrum is moved by a specially shaped cam so that the direction of the reference line of the optical pickup always coincides with the tangential direction of the record track. There was a problem that the moving mechanism of the fulcrum became complicated.

Therefore, the present invention can adopt the 3-beam method for tracking error detection, does not require a high-precision linear guide, can reduce the moment of inertia, and can be driven by a small output drive motor. It is an object of the present invention to provide an optical pickup drive device for an optical disc that can reduce the output signal line length and shorten the output signal line length to prevent the output signal from deteriorating.

[0007]

In order to achieve the above object, an optical pickup driving device for an optical disk according to the present invention swings around a swinging fulcrum provided on a base and the swinging fulcrum as a spindle. A swing arm that holds the optical pick-up in a fixed manner, a flat portion parallel to the center axis of the swing arm is provided near the end of the swing arm, and a corrected point is provided at a predetermined position. A correction fulcrum provided on the base and a correction arm having one end rotatably supported by the correction fulcrum and the other end rotatably connected to the correction target point. An optical disk light having a correction mechanism that moves on a circular arc having a radius smaller than the distance from the point to be corrected to the swing fulcrum with respect to the correction point, and a drive mechanism that swings and drives the swing arm. In the pickup drive device, The optical pickup is composed of a lens drive unit and an optical system unit, and the direction of the reference line of the lens drive unit and the optical axis direction of the optical system unit form an angle of substantially 45 degrees. The optical pickup is fixed to the swing arm so that the direction of the reference line of the lens drive unit is always matched with the tangential direction of the record track of the optical disc within the allowable error.

Further, it is preferable that an output terminal for a read signal is provided at a position from the swing fulcrum of the optical system unit.

The drive mechanism includes a feed screw shaft having a screw portion at the front and a guide portion at the rear, a bearing for holding the feed screw shaft so as to be rotatable and tiltable in the axial direction, and a feed screw. A drive rod having a nut that is screwed onto the shaft, the tip of which is pivotally supported at the drive fulcrum of the middle part of the swing arm, the feed motor, the output shaft of the feed motor, and the rear of the feed screw shaft. And a universal joint that connects the ends.

Further, in the optical pickup driving device for an optical disk according to the present invention, the flat portion of the swing arm is an elongated hole extending in the central axis direction of the swing arm, and the swing fulcrum is in the elongated hole. In addition, it may be loosely fitted so as to be relatively movable only in the central axis direction of the swing arm.

In the optical pickup driving device for an optical disk according to the present invention, a tip guide member attached to the base and a tip guide member provided at a swing side end portion of the swing arm are slidably supported and guided by the tip guide member. It is preferable that the sliding support member and a protrusion that is provided at an intermediate portion of the swing arm and that slides on the base are provided.

[0012]

[Embodiment of device]

 Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the optical disc drive of the present invention applied to a CD. Figure 3 shows the principle of this proposal. The CD 10 is rotationally driven around the CD rotation center 32. Among the record tracks of CD10, the inner track A, the intermediate track B, and the outer track C are taken as representative values in order from the inner track side. When the objective lens 9 of the lens drive unit 1 attached to the tip of the swing arm 2 on the swing side is located right above these record tracks, the tangential direction of the record track and the reference of the lens drive unit 1 are determined. The directions of the lines should match. J, K, and L represent the position of the central axis of the swing arm 2 when the objective lens 9 is on the inner track A, the middle track B, and the outer track C. Further, the angle formed by the straight line J and the straight line K is equal to the angle formed by the straight line K and the straight line L.

A locus D indicates an arc which is a locus drawn by the center of the objective lens 9 when the objective lens 9 simply rotates around the swing fulcrum 8. This corresponds to the locus in the case of a simple rotation mechanism in which the swing arm 2 is pivotally supported by the swing fulcrum 8. In the case of such a simple rotation mechanism, by setting the pickup offset angle F on the inner track A to an appropriate value, the reference line R of the lens drive unit 1 and the tangent T of the inner track A can be set. However, in the intermediate track B, a deviation of an error angle E occurs between the reference line R ′ and the tangent line T ′ of the intermediate track B.

Even with a simple rotation mechanism, the position of the rocking fulcrum 8, the length of the rocking arm 2, and the pickup offset angle F can be set so that the error angle becomes zero again on the outer peripheral track C. . For example, when the radius of the inner track A is 23.0 mm, the radius of the outer track C is 58.0 mm, and the distance between the rocking fulcrum 8 and the CD center 32 is 64.0 mm, the length of the rocking arm 2 If the distance between the fulcrum 8 and the center of the objective lens 9) is 73.7 mm and the pickup offset angle is 33.0 degrees, the error angle becomes zero on the inner track A and outer track C. This calculation can be easily performed by applying the cosine theorem to a triangle having the CD center 32, the swing fulcrum 8 and the center of the objective lens 9 as vertices. In this case, the error angle E at the middle portion of the arc becomes about 7 degrees, and the tracking error detection by the 3-beam method cannot be performed as it is. In the three-beam method, the error angle needs to be within about 0.2 degrees.

Therefore, as the locus G, a locus whose error angle is always zero on the locus is considered. On the locus G, the angle at which the CD center 32 and the swing fulcrum 8 are seen from the center of the objective lens 9 is constant, so the locus G is an arc passing through the CD center 32 and the swing fulcrum 8. Since the error angle of the locus D also becomes zero at the intersection with the inner track A and the outer track C, it is possible to consider a locus G having a common point with the locus D on the inner track A and the outer track C. The center of the locus G is on the bisector of the angle formed by the straight line J and the straight line L, that is, on the straight line K, and also on the vertical bisector of the line segment connecting the CD center 32 and the swing fulcrum 8. Therefore, the intersection S of these straight lines is obtained.

The present invention corrects the locus D so that the center of the objective lens 9 passes on a locus that is similar to the locus G. Comparing the locus D and the locus G, the loci coincide with each other on the straight line J and the straight line L, and the locus G projects radially outward by the distance d on the straight line K. That is, the locus D, which is the locus of simple rotational movement, may be projected outward on the straight line K by the distance d 1. The correction arm 4 is used for this purpose. The correction arm 4 rotates about a correction fulcrum 5 on the base 6, and the other end of the correction arm 4 is pivotally supported on a corrected point 3 on the swing arm 2. The correction fulcrum 5 is on the bisector of the angle formed by the straight line J and the straight line L, that is, the straight line K, and the corrected point 3 is on the central axis of the swing arm 2.

The locus when the corrected point 3 simply rotates from the position on the straight line J around the swing fulcrum 8 is represented by P, and the locus of the corrected point 3 due to the rotation of the correction arm 3 is Q. Then, the respective dimensions may be set so that the locus Q projects outward on the straight line K by a distance d from the locus P. By adopting such a mechanism, the locus through which the center of the objective lens 9 passes is the locus that coincides with the locus D on the straight lines J and L and projects outward on the straight line K by the distance d, that is, the locus G. The trajectory is extremely close. In fact, due to the mechanism of the correction arm 4, the error angle is within 0.1 degree at all points within the swing range of the straight line J to the straight line L, which is sufficient for detecting the tracking error of the three-beam method.

In particular, when the position of the correction fulcrum 5 is aligned with the point S and the correction target point 3 is aligned with the center of the objective lens 9, the trajectory along which the center of the objective lens 9 passes is the trajectory G itself. In this case, the error angle is completely zero. However, since the point to be corrected 3 coincides with the center of the objective lens 9, it is necessary to devise a hollow support shaft for the correction fulcrum 5 or the like, which increases the manufacturing cost. In FIG. 3, the corrected point 3 is on the central axis of the swing arm 2 and the correction fulcrum 5 is on the straight line K. However, in reality, if the error angle is within the allowable range, the correction point 3 and the corrected point 3 are corrected. The position of the fulcrum 5 may be a position deviated from each straight line.

FIG. 1 is a view of a CD drive adopting the optical pickup driving device for an optical disk of the present invention, viewed from the back surface side opposite to the CD 10 mounting side. Each mechanism of the CD drive is arranged in a box-shaped chassis 24, and a detection window 25 is provided in the chassis 24. The CD 10 is mounted on the front side of the chassis 24 so that the reading surface faces the detection window 25, and the information recorded on the CD 10 is read by the optical pickup including the lens driving unit 1 and the optical system unit 11.

The spindle motor 22 for rotating the CD and the base 6 are fixed to the chassis 24. A swing fulcrum 8 composed of a cylindrical pin is fixed to the base 6. As a flat portion on the side of the swing fulcrum 8 of the swing arm 2, an elongated hole 7 is formed that is long in the direction of the central axis of the swing arm 2. The width of the long hole 7 is almost equal to the diameter of the swing fulcrum 8, and the swing arm 2 and the swing fulcrum 8 are loosely fitted so as to be relatively movable only in the central axis direction. The long hole 7 is formed so as to include the central axis of the swing arm 2 and include a plane parallel to the central axis of the swing fulcrum 8. The optical pickup is fixed to the swing arm 2, the lens drive unit 1 is attached to the swing-side end of the swing arm 2, and the optical system unit 11 is attached to the intermediate portion of the swing arm 2. An output terminal 12 is provided on the side surface of the optical system unit 11 on the side of the swing fulcrum 8 and a CD read signal is output from the output terminal 12 and is attached to the chassis 24 via a signal line (not shown). Entered in.

In this embodiment, since the heavy optical system unit 11 is attached to the intermediate portion of the swing arm 2 which is relatively close to the swing fulcrum 8, the optical pickup and the swing arm 2 as a whole. The moment of inertia becomes small, and the output of the motor that drives them swinging is small. Further, since the output terminal 12 is provided at the position on the swing fulcrum 8 side of the optical system unit 11, the length of the signal line connecting the output terminal 12 and the amplifier fixed to the chassis 24 side is short. It is possible to reduce deterioration of the output signal and mixing of noise.

A correction fulcrum 5 made of a cylindrical pin is fixed to a base 6 at a substantially central position of a swing range angle of a central axis of the swing arm 2. Further, a point 3 to be corrected is provided on the central axis of the swing arm 2 and closer to the tip than the correction fulcrum 5. One end of the correction arm 4 is pivotally supported by the correction fulcrum 5, and the other end of the correction arm 4 is pivotally supported by the corrected point. Since the distance between the fulcrums at both ends of the correction arm 4 is shorter than the distance between the point to be corrected 3 and the swing fulcrum 8, the swing motion of the tip of the swing arm 2 is not just a swing motion, but a correction arm 4 Then, the swing locus corrected by is drawn. Specifically, the swing locus in which the swing center of the arc protrudes outward in the radial direction is drawn.

The drive mechanism for swinging the swing arm 2 includes a feed motor 18, a feed screw shaft 16, a drive rod 15, and the like. 4 and 5 show the detailed structure of this drive mechanism. The feed screw shaft 16 is rotatably supported by a bearing 14, but can be tilted at a constant angle in the axial direction. Further, since the feed screw shaft 16 is biased in the axial direction by the spring 141 provided in the bearing 14, the play is improved in the axial direction without any play in the axial direction. About half of the entire length of the feed screw shaft 16 on the feed motor 18 side is formed as a guide portion 161, and the guide portion 161 guides the drive rod 15 in the axial direction of the feed screw shaft 16. About half of the total length on the tip side of the feed screw shaft 16 is a screw portion 162, and a male screw for swinging and feeding the swing arm 2 is formed. The screw portion 162 and the nut 20 fixed on the drive rod 15 are screwed together to convert the rotational movement of the feed screw shaft 16 into the linear movement of the drive rod 15.

The drive rod 15 and the swing arm 2 are axially supported by a drive fulcrum 23 at an intermediate portion of the swing arm 2. The output shaft of the feed motor 18 is connected to the feed screw shaft 16 by a universal joint 17. With the mechanism of the universal shaft joint 17 and the bearing 14, the feed screw shaft 16 can transmit rotation even if it is inclined with respect to the output shaft of the feed motor 18. As shown in FIGS. 4 and 5, even though the drive fulcrum 23 moves in a substantially arcuate shape, this mechanism enables smooth swing feed drive. A rotation angle sensor 19 is provided on the output shaft of the feed motor 18, and a detection pulse is generated at every constant rotation angle of the feed motor 18. With this detection pulse, it is possible to precisely control even a small amount of swing feed movement.

Returning to the description of FIG. As a commercially available unit of an optical pickup, it is common that the direction of the reference line of the lens driving unit 1 and the optical axis direction of the optical system unit 11 are fixed at an angle of substantially 45 degrees. is there. Therefore, in the present invention, the optical axis direction U of the optical system unit 11 is arranged so as to be inclined from the central axis direction of the swing arm 2, and the direction of the reference line R of the lens drive unit 1 and the optical axis of the optical system unit 11 are arranged. It is arranged so as to form an angle of substantially 45 degrees with the axial direction U. As a result, it is possible to use a commercially available unit of the general 45-degree tilt type as the optical pickup, and it is possible to reduce the manufacturing cost.

Since the swing arm 2 is supported on the swing fulcrum 8 side and is cantilevered, the swing arm 2 has low rigidity, and particularly the tip end side is liable to vibrate or vibrate. Therefore, in order to improve this, a tip guide member 251 is attached to the chassis 24 on one side on the tip side of the detection window 25, and a slide support member 252 provided at the tip of the swing arm 2 is slid on the tip guide member 251. Support and guide freely. The sliding support member 252 is provided with two sliding support portions at both ends in the sliding direction, and also has an effect of preventing the swing arm 2 from being twisted. This guide mechanism can prevent the tip portion of the swing arm 2 from swinging or vibrating, and reduce reading errors of CD recording signals. Further, since the tip guide member 251 is formed as a member different from the chassis 24, a material suitable for the guide can be freely selected. As the material of the tip guide member 251 and the sliding support member 252, a material such as fluororesin having a small coefficient of friction and little wear is used.

FIG. 6 is a view showing another embodiment of the present invention. In the embodiment of FIG. 1, the CD 10 and the optical pickup driving device are arranged on the opposite side of the chassis 24 so as to sandwich the chassis 24, but in the embodiment of FIG. The optical pickup driving device and the CD 10 are arranged on the same side with respect to the chassis 24. Therefore, it is not necessary to provide the detection window 25 on the chassis 24, and the structure is simple. Further, a protrusion 26 is provided on an intermediate portion of the swing arm 2 on the chassis 24 side, and the protrusion 26 is arranged so as to slide on the chassis 24 when the swing arm 2 swings. Although the protrusion 26 is provided as a long ridge in the width direction of the swing arm 2, two protrusions may be provided at both ends in the width direction, or one protrusion may be provided at the center in the width direction. When the ridge or the two protrusions are provided, there is an effect of preventing the swing arm 2 from twisting. The protrusion 26 can prevent the swing arm 2 from swinging or vibrating. FIG. 7 is a cross-sectional view as seen from the direction of arrow XX in FIG. The CD 10 is supported by the CD chuck 27, and the CD chuck 27 is fixed to the output shaft of the spindle motor 22 shown in FIG.

[0028]

【Example】

 With the arrangement shown in FIG. 3, in the following dimension example, the error angle is within 0.1 degree at all points within the swing range of the straight line J to the straight line L, which is sufficient for detecting the tracking error of the three-beam method. It became a new optical pickup drive device for optical disks.

Radius of inner track A: 23.0 mm Radius of outer track C: 58.0 mm Distance between rocking fulcrum 8 and CD center 32: 63.9 mm Rocking fulcrum 8 on the straight line J and objective lens 9 Distance from center of 73.0 mm Pickup offset angle: 33.0 degrees Distance between corrected point 3 and center of objective lens 9: 43.9 mm Distance between rocking fulcrum 8 and correction fulcrum 5: 22.3 mm Correction Distance between fulcrum 5 and corrected point 3: 10.0 mm

[0030]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

Since the optical pickup is driven by the swinging motion about the swinging fulcrum, the energy loss due to friction or the like is less than that of the driving by the linear guide.

A high-precision linear guide is also unnecessary, and the manufacturing cost is reduced.

Since the heavy optical system unit is attached to the intermediate portion of the swing arm, the moment of inertia of the whole becomes small, and the output of the motor for swing-driving these is small.

Since the output terminal is provided at the position on the swing fulcrum side of the optical system unit, the length of the signal line that connects the output terminal and the amplifier can be short, and the deterioration of the output signal and the mixing of noises can be avoided. Can be reduced.

It is possible to use a commercially available unit of general 45-degree tilt type as an optical pickup, and it is possible to reduce the manufacturing cost.

The guide mechanism at the tip of the swing arm can prevent the swing or vibration of the tip of the swing arm, and reduce CD recording signal reading errors and the like.

[Brief description of drawings]

FIG. 1 is a view of a rear surface of an optical pickup driving device for an optical disc according to the present invention applied to a CD drive.

FIG. 2 is a diagram showing the principle of tracking error detection by the three-beam method.

FIG. 3 is a diagram showing the principle of the optical pickup driving device for an optical disc of the present invention.

FIG. 4 is a diagram showing an operating state of a drive mechanism.

FIG. 5 is a diagram showing an operating state of a drive mechanism.

FIG. 6 is a view of the optical pickup driving device for an optical disc according to another embodiment of the present invention applied to a CD drive, as viewed from the CD side.

7 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lens drive unit 2 ... Oscillating arm 3 ... Correction point 4 ... Correction arm 5 ... Correction fulcrum 6 ... Base 7 ... Long hole 8 ... Oscillation fulcrum 9 ... Objective lens 10 ... CD 11 ... Optical system unit 12 ... Output terminal 14 ... Bearing 15 ... Drive rod 16 ... Feed screw shaft 17 ... Universal shaft joint 18 ... Feed motor 19 ... Rotation angle sensor 20 ... Nut 21 ... Biasing member 22 ... Spindle motor 23 ... Drive fulcrum 24 ... Chassis 25 ... Detection Window 26 ... Protrusion 27 ... CD chuck 32 ... CD center 141 ... Spring 161 ... Guide part 162 ... Screw part 251 ... Tip guide member 252 ... Sliding support member

Claims (6)

[Scope of utility model registration request] 1. A rocking fulcrum (8) provided on a base (6, 24) and a rocking fulcrum for oscillating about said rocking fulcrum (8) as a pivot for fixing and holding an optical pickup (1, 11). The moving arm (2) is provided with a flat portion (7) parallel to the central axis of the swing arm (2) near its end, and a corrected point (3) is provided at a predetermined position. A swinging arm (2), and a correction fulcrum (5) provided on the base (6, 24),
A correction arm (4) having one end rotatably supported by the correction fulcrum (5) and the other end rotatably connected to the correction target point (3); For 3),
An optical disc having a correction mechanism that moves on an arc having a radius smaller than the distance from the point to be corrected (3) to the swing fulcrum (8), and a drive mechanism that swings and drives the swing arm (2). In the optical pickup driving device for use, the optical pickup (1, 11) comprises a lens driving unit (1) and an optical system unit (11), and a direction of a reference line (R) of the lens driving unit (1). The optical pickup (1, 11) is fixed to the swing arm (2) so that the optical axis direction (U) of the optical system unit (11) forms an angle of substantially 45 degrees, and the lens drive unit (1) The optical pickup driving device for an optical disk, wherein the direction of the reference line (R) is always matched with the tangential direction of the record track of the optical disk within an allowable error. 2. The optical pickup driving device for an optical disk according to claim 1, wherein the optical system unit (11).
2. An optical pickup driving device for an optical disc, wherein an output terminal (12) for a read signal is provided at a position from the swing fulcrum (8). 3. The optical pickup driving device for an optical disk according to claim 1, wherein the driving mechanism is configured such that a front portion is a screw portion (162) and a rear portion is a guide portion (161). A feed screw shaft (16), a bearing (14) that holds the feed screw shaft (16) so that the feed screw shaft (16) can rotate and can tilt in the axial direction, and a nut (20) that is screwed onto the feed screw shaft (16). Have
The tip is a driving fulcrum (23) in the middle of the swing arm (2).
A drive rod (15) axially supported by the feed motor (18), an output shaft of the feed motor (18) and the feed screw shaft (1)
6) An optical pickup drive device for an optical disc, which has a universal joint (17) for connecting the rear ends thereof. 4. The optical pickup driving device for an optical disk according to claim 1, wherein the flat portion of the swing arm (2) is in a central axis direction of the swing arm (2). An optical disc which is a long hole (71) extending in the axial direction, and the swing fulcrum (8) is loosely fitted in the long hole (71) so as to be relatively movable only in the central axis direction of the swing arm (2). Optical pickup driver. 5. The optical pickup driving device for an optical disk according to claim 1, wherein the tip guide member (2) attached to the base (6, 24).
51), a slide support member (252) provided at the swing side end of the swing arm (2) and slidably supported and guided by the tip guide member (251), and the swing arm (252). An optical pickup driving device for an optical disc, which has a protrusion (26) provided in the middle portion of 2) and sliding with the bases (6, 24). 6. The optical pickup driving device for an optical disc according to claim 1, wherein the optical pickup driving device is arranged on the same side as the optical disc with respect to the substrate (6, 24). Optical disk drive for optical disc.