JP2001101670A - Optical disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tangential tilt mechanism that has only a small number of parts and that facilitates correction of a tangential tilt. SOLUTION: The tangential tilt mechanism 40 is equipped with a pair of tilt supporting points 16, 17 which cross the moving direction of an optical pickup 11 at right angles and which are attached to both sides of a second base 10 through a spindle motor 4, a first supporting member 41 one end of which is attached to a first base 1 and the other end of which supports one 16 of the pair of the tilt supporting points 16, 17 in a rockable manner, and a second supporting member 42 which is attached at one end to the first base 1 through an adjusting screw 45, which supports, with the other end, the other tilt supporting point 17 in a rockable manner, and which, at the other end, is elastically displaced in the height direction against the first base 1 through the adjustment of the adjusting screw 45, displacing the other tilt supporting point 17 in the height direction with the one tilt supporting point 16 used as a fulcrum.

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 having a tilt correction mechanism.

[0002]

2. Description of the Related Art Conventionally, an optical pickup performs a tilt servo in a radial direction with respect to an optical disk,
An optical disk recording / reproducing apparatus of a system for performing a manual correction of a tangential tilt is disclosed in Japanese Patent Application Laid-Open No. 09-198685.

FIG. 7 is a perspective view showing a conventional optical disk recording / reproducing apparatus having a tilt correction mechanism, and FIG. 8 is a view for explaining the operation of the sub-guide shaft shown in FIG.

An optical disk recording / reproducing apparatus having a conventional tilt correcting mechanism shown in FIG. 7 is disclosed in Japanese Patent Laid-Open No. 09-198685.
The optical pickup 201 moves along a main guide shaft 202 and a sub guide shaft 203 on a plane parallel to a recording surface of a disc (not shown). It can move radially.

As shown in an enlarged view in FIG. 8, a cam portion 204 is formed on the surface of the sub-guide shaft 203, and the sub-guide shaft 203 is moved by a motor 207 via a worm gear 205 and a worm 206. Rotate. At this time, the optical pickup 201 is in contact with the cam portion 204 of the sub guide shaft 203,
Since the height of the optical pickup 201 can be changed by the rotation of the sub guide shaft 203, the optical pickup 201 can be corrected in the tangential direction with respect to the optical disc.

[0006]

However, the above conventional example has the following problems. . It is necessary to prepare a sub guide shaft 203 having a shape that is not normally used, and it is difficult to reduce the cost. . Cam portion 204 of rotating sub-guide shaft 203
Since the optical pickup 201 follows the optical pickup 201, it is necessary to provide a clearance in the bearing portion of the sub guide shaft 203, which may cause vibration during movement of the optical pickup 201. SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical disk recording / reproducing apparatus that solves the above-mentioned problems and that reliably performs tangential tilt correction while using a simple mechanism.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a first base on which a spindle motor for rotating the turntable for mounting an optical disk is mounted, and the optical disk. A second base on which an optical pickup is movably mounted in a radial direction of the optical disc for irradiating the optical pickup with a light beam; and a first base and the second base connected to the second base. A radial tilt mechanism for displacing the optical disc in a radial direction; a tangential tilt mechanism connected to the first base and the second base for displacing the optical pickup in a tangential direction of the optical disc; In the optical disk drive device provided with, the tangential tilt mechanism is the optical type A pair of tilt fulcrums that are substantially orthogonal to the direction of the backup movement and are attached to both sides of the second base via the spindle motor, and one end is attached to the first base, and A first support member having an end side swingably supporting one of the pair of tilt fulcrums; an end mounted on the first base via an adjusting screw, and the other end side being a pair of the tilt fulcrums; Is pivotally supported, and the other end side is elastically displaced in the height direction with respect to the first base 1 by adjusting the adjustment screw so that the other tilt fulcrum is raised with one tilt fulcrum as a fulcrum. And a second support member for displacing the optical disk in the vertical direction.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of an optical disk drive according to the present invention will be described below in detail with reference to FIGS. FIG. 1 is a perspective view showing an optical disk drive according to the present invention, FIG. 2 is a side view for explaining the radial tilt correction mechanism shown in FIG. 1, and FIGS. 3 (a) and 3 (b) are shown in FIG. 4A to 4C are side views and front views for explaining the first support member shown, and FIGS. 4A to 4C are left side views and front views for explaining the second support member shown in FIG. Right side view, FIG. 5
(A), (b) is a diagram for explaining the operation of the adjusting screw for adjusting the inclination of the second support member with respect to the first base in the height direction in the tangential tilt mechanism shown in FIG. FIG. 6 is a diagram for explaining the effect when the middle part of the tilt fulcrum supported by the second support member is spherical.

In the optical disk drive according to the present invention shown in FIG. 1, a spindle motor 4 for rotating a turntable 3 for mounting an optical disk 2 is fixedly mounted on a first base 1. ing.

An optical pickup 11 for irradiating the optical disk 2 with a light beam is mounted on the second base 10 so as to be movable in the radial direction of the optical disk 2 (the direction of arrow A). At this time, the optical pickup 11 is mounted on a support table 12, and the support table 12 is
The pickup drive source 20 allows the optical disk 2 to move in the radial direction along the guide shafts 14 and 15. The pickup drive source 20 is a motor 2
The rotation of 1 is reduced by the gear train 22, and the last gear of the gear train 22 is meshed with the rack 13 attached to the support base 12 of the optical pickup 11, so that the optical pickup 11 moves in the direction of arrow A. It is movable.

A pair of tilt fulcrums 16 and 17 are provided on a straight line substantially perpendicular to the moving direction of the optical pickup 11 and on both sides of the second base 10 via the spindle motor 4 using pins. Installed. The pair of tilt fulcrums 16 and 17 are common tilt fulcrums in a radial tilt correction mechanism 30 and a tangential correction mechanism 40 described later. The pair of tilt fulcrums 16 and 17 are swingably attached to the other ends of the first and second support members 41 and 42 each having one end attached to the first base 1. 1, second support member 4
The support structure for the members 1 and 42 will be described later.

Here, the above-mentioned radial tilt correction mechanism 30 is provided so as to be connected between the first base 1 and the second base 10, and the radial tilt correction mechanism 30 is an optical tilt tilt optical mechanism. The optical pickup 2 is mounted on the outer peripheral side of the optical disk 2 in the moving direction of the pickup 11. The radial tilt correcting mechanism 30 vertically swings the optical pickup 11 movably mounted on the second base 10 in the radial direction of the optical disk 2 around a pair of tilt fulcrums 16 and 17. It is.

That is, as shown in FIG. 2, the radial tilt correction mechanism 30 has a tilt motor 31, a gear train 32, and a cam wheel 33 mounted on a first base 1, and controls the rotation of the tilt motor 31. The gear train 32 is decelerated and the final gear of the gear train 32 is changed to a cam wheel 33.
The cam wheel 33 having the inclined cam surface 33a is rotatable. On the other hand, a pin 18 is fixed to the second base 10 in the moving direction of the optical pickup 11 and on the outer peripheral side of the optical disk 2, and the pin 18 is in sliding contact with the inclined cam surface 33 a of the cam wheel 33. At this time, a coil spring 34 is mounted between the first base 1 and the second base 10, and the pin 18 fixed to the second base 10 by the urging force of the coil spring 34 causes the tilt cam of the cam wheel 33 to move. It is pressed against the surface 33a. Since the second base 10 to which the pin 18 is fixed is restricted by a restricting member (not shown) in the direction perpendicular to the moving direction of the optical pickup 11, the pin 18 can move only in the vertical direction.

When a tilt motor 31 is rotated by a predetermined amount with reference to a signal from a radial tilt sensor 19 (FIG. 1) mounted on the support base 12 of the optical pickup 11, and the cam wheel 33 is rotated, the tilt cam is rotated. Face 3
Since the pin 18 slidingly contacting 3a moves up and down in the height direction with respect to the first base 1, the second base 10
A pair of tilt fulcrums 16 on the second support members 41 and 42,
It swings up and down (arrow Za direction) around 17. As a result, the optical pickup 11 also swings up and down (in the direction of arrow Za) integrally with the second base 10, so that the optical axis of the optical pickup 11 on the second base 10 is such that the optical disc 2 is in the radial direction. Even if it is deformed (in the radial direction), its optical axis can be irradiated perpendicularly to the disk surface, and radial tilt correction is automatically performed. The radial tilt sensor 19 (FIG. 1) outputs a signal indicating how much the angle between the light beam emitted from the objective lens (not shown) in the optical pickup 11 and the disk surface is deviated from a right angle. .

Referring back to FIG. 1, a tangential correction mechanism 40, which is a main part of the present invention, is also provided between the first base 1 and the second base 10 so as to be connected. The correction mechanism 40 is an optical pickup 11
Optical disk 2 in a direction substantially perpendicular to the moving direction of
Is mounted on the outer peripheral side. The tangential correction mechanism 40 includes an optical pickup 11 movably attached to the second base 10 in a direction substantially perpendicular to the radial direction of the optical disc 2 (circumferential direction of the optical disc 2). The other side of the tilt fulcrum 17 is swung up and down with the side as a fulcrum.

As described above, a pair of tilt fulcrums 16,
17, the first and second support members 41 for swingably supporting
Reference numerals 42 are not symmetrical to each other, and the first support member 41 on the left side in the figure is formed in a block shape using a resin material, while the second support member 42 is formed to be elastically displaceable using a resin material. ing.

That is, FIGS. 3A and 3B and FIG.
To (c), the first and second support members 41, 4
2, the lower end is attached to the first base 1,
A pair of tilt fulcrums 16, 1 using pins on the other upper end side
U-shaped grooves 41a, 4 for swingably supporting the groove 7.
2a are respectively formed. At this time, a pair of tilt fulcrums 1 are provided at the upper ends of the first and second support members 41 and 42.
Leaf springs 43, 44 for pressing the 6, 7 into the substantially U-shaped grooves 41a, 42a are screwed respectively.
At this time, the leaf springs 43 and 44 are connected to the first and second support members 4.
The preload is operated so that the pair of tilt fulcrums 16 and 17 are always in contact with each other.

The first support member 41 is provided so as to stand upright from the first base 1 in the vertical direction. On the other hand, the second support member 42 has cantilevered projections 4 on both sides thereof.
2b and 42c extend in opposite directions with a step, respectively. The cantilevered projection 42b extends outside the tilt fulcrum 17, while the cantilevered projection 42c extends inside the tilt fulcrum 17b. ing. The second support member 42 stands upright from the first base 1 at an angle such that it inclines slightly inside the tilt fulcrum 17. Here, the inside refers to a direction of the optical pickup 11 with respect to the second support member 42 in FIG. 1 (that is, the left side in FIG. 1).

Further, the second support member 42 is provided with an adjusting screw 45 in a hole 42b1 provided in the outer cantilever-like projection 42b.
And the screw portion of the adjusting screw 45 is screwed into a female screw (not shown) provided on the first base 1. The rotation of the adjusting screw 45 causes the second support member 4 to rotate.
2 with respect to the first base 1 can be adjusted in the height direction.

The height of the inner cantilevered projection 42c of the cantilevered projections 42b and 42c of the second support member 42 is high enough to contact the tilt fulcrum 17. That is, the tilt fulcrum 17 is in contact with the side wall of the substantially U-shaped groove 42a and the inner cantilever projection 42c.

The operation of the adjusting screw 45 for adjusting the inclination of the second support member 42 with respect to the first base 1 in the height direction will be described with reference to FIGS. 5 (a) and 5 (b). First, as shown in FIGS. 5A and 5B, the second support member 42
Turn the adjustment screw 45 provided on the cantilevered projection 42b clockwise. That is, when the adjustment screw 45 is screwed deeper, the second
Of the second support member 42 inclined inward in the direction of arrow Zt by a small amount about the X point, and the angle of inclination of the second support member 42 inclined inward is reduced. At this time, the tilt fulcrum 17 supported by the second support member 42 moves slightly upward. However, since the tilt fulcrum 16 supported by the first support member 41 is maintained at the same height, the amount of tilt in the tangential direction can be slightly corrected. In the case where a minute amount is corrected in the opposite direction, the adjustment screw 45 may be turned counterclockwise. Note that the neutral position is a state in which the second support member 42 is bent to some extent by the adjustment screw 45, but it is preferable that the neutral position be an intermediate position in a range where the second support member 42 can be elastically displaced.

As shown in FIG. 6, a spherical portion 17a is formed in the middle of the tilt fulcrum 17 supported by the second support member 42, and the spherical portion 17a is formed by an inner cantilever 42c. The following effects can be expected by receiving it.

When the second support member 42 is elastically displaced as described above, the height of the inner cantilever-like projection 42c is slightly increased or decreased. If the spherical portion 17a is always in contact with this portion, tangential tilt correction can be performed smoothly. In this case, the substantially U-shaped groove 42a is used.
Since the tilt fulcrum 17 is regulated by the pair of upright walls, no rattling occurs during or after the correction of the tangential tilt.

In FIG. 6, the spherical portion 1 of the tilt fulcrum 17 is shown.
7a is supported by the inner cantilever-shaped protrusion 42c,
Since the upper portion is held by the holding member 46, the tangential tilt can be corrected without play.

Further, in FIG. 6, the second support member 42 is rotated about the point X substantially in the direction of the arrow Zt, and the length of L1 and L2 is set to satisfy the relationship of L2> L1. Spherical part 17 by the amount of displacement which increased the amount of screwing
a can move up and down. Therefore, if it is estimated that a relatively large adjustment amount is required, the relationship of L2> L1 may be set. Conversely, if L2 <L1, a very small tangential tilt can be corrected.

In place of the holding member 46, the spherical portion 17a of the tilt fulcrum 17 may be pressed by the tip of the leaf spring 44. In this case, the pressing of the leaf spring 44 is performed before and after the tangential tilt correction is performed. The change in pressure is very small, and fluctuation in frictional resistance to the tangential tilt mechanism can be eliminated.

The above-described tangential tilt mechanism 4
At 0, the inclination of the optical pickup 11 provided on the first base 10 in the tangential direction with respect to the optical disc 2 with respect to the first base 1 is corrected, but this may be adjusted once. It is a matter of course that the tangential tilt correction can be automatically performed by connecting a motor to the adjusting screw 45 as required.

The second base 10 is a first base 1
Are supported at three points by a pin 18 and a pair of tilt fulcrums 16 and 17.

[0029]

According to the optical disk drive of the present invention described in detail above, in particular, the tangential tilt mechanism is substantially perpendicular to the moving direction of the optical pickup, and the second tangential tilt mechanism is driven via the spindle motor. A pair of tilt fulcrums attached to both sides of the base, a first support member having one end attached to the first base, and the other end swingably supporting one of the pair of tilt fulcrums; The other end of the pair of tilt fulcrums is pivotally supported on the other end of the first base 1 by adjusting one end of the first base 1 by adjusting the adjustment screw. A second support member for elastically displacing in the height direction and displacing the other tilt fulcrum in the height direction with the other tilt fulcrum as a fulcrum, thereby providing a part of the tangential tilt correction mechanism. Without increasing the number, it is possible to easily correct the optical pickup in the tangential direction on the optical disc.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an optical disk drive according to the present invention.

FIG. 2 is a side view for explaining the radial tilt correction mechanism shown in FIG.

FIGS. 3A and 3B are a side view and a front view for explaining the first support member shown in FIG.

FIGS. 4A to 4C are a left side view, a front view, and a right side view for explaining the second support member shown in FIG.

FIGS. 5A and 5B illustrate the operation of an adjusting screw for adjusting the inclination of a second support member in a height direction with respect to a first base in the tangential tilt mechanism shown in FIG. 1; FIG.

FIG. 6 is a view for explaining an effect when the middle part of the tilt fulcrum supported by the second support member is spherical.

FIG. 7 is a perspective view showing an optical disc recording / reproducing apparatus provided with a conventional tilt correction mechanism.

FIG. 8 is a view for explaining the operation of the sub-guide shaft shown in FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st base, 2 ... Optical disk, 3 ... Turntable, 4 ... Spindle motor, 10 ... 2nd base, 11
... optical pickup, 16, 17 ... a pair of tilt fulcrum, 30 ... radial tilt correction mechanism, 40 ... tangential correction mechanism, 41 ... first support member, 42 ... second
Support members, 42b, 42c: cantilevered projections, 45: adjusting screws.

Claims (1)

[Claims] A first base on which a spindle motor for rotating the turntable for mounting an optical disk is mounted; and an optical pickup for irradiating the optical disk with a light beam, in a radial direction of the optical disk. A second base movably mounted, a radial tilt mechanism coupled to the first base and the second base, and displacing the optical pickup in a radial direction of the optical disk; An optical disc drive, comprising: a tangential tilt mechanism connected to the base and the second base for displacing the optical pickup in a tangential direction of the optical disc; wherein the tangential tilt mechanism comprises: Substantially perpendicular to the direction of movement of the pickup, and A pair of tilt fulcrums attached to both sides of the second base via a motor, and one end attached to the first base, and the other end swingably supports one of the pair of tilt fulcrums. A first support member that performs
One end is attached to the base via an adjustment screw, and the other end side swingably supports the other of the pair of tilt fulcrums, and the other end is adjusted to the first base by adjusting the adjustment screw. An optical disk drive, comprising: a second support member that elastically displaces in the height direction and displaces the other tilt fulcrum in the height direction with the one tilt fulcrum as a fulcrum.