JP2000235722A - Optical disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occupation space of a tilt correcting mechanism by a simple structure. SOLUTION: A first base 15 having an optical pickup 14 mounted thereon and a second base 13 having a turntable 11 mounted thereon are installed such that each longitudinal direction thereof is extended in a direction orthogonal to the moving direction A of the optical pickup 14, both end parts are connected to each other by a plate-like twisting member 16 fixed to the first and second bases 15 and 13, and by the twisting of the twisting member 16, the first base 15 is rotated in a direction B orthogonal to the disk surface of an optical disk with respect to the second base 13.

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 equipped with an optical pickup for performing a recording / reproducing process by irradiating an optical disk with a light beam, and more particularly, to an optical pickup according to a surface inclination of an optical disk. The present invention relates to a tilt correction mechanism that corrects a light beam emitted from an optical disk so that the light beam is emitted perpendicularly to an optical disk.

[0002]

2. Description of the Related Art FIG. 9 is an exploded perspective view showing a schematic structure of an optical disk drive provided with a conventional tilt correction mechanism.
In this device, a rectangular space 2a is formed in the center, and a base 2 whose inclination is constant with respect to a turntable 1 on which an optical disk is mounted, and an optical pickup 3 are movable (radial direction of the optical disk: direction of arrow A). And a rotating shaft 6 provided on the bearing portion 4 of the base 2 and supported by being pressed by the leaf spring 5, and capable of rotating in the rectangular space 2a. In addition, at one side of the base 2 away from the bearing portion 4, a distance (inclination angle) between the base 2 and the tilt movable member 7 is regulated, and an inclined surface 8a is formed in a part for changing the regulation amount. Tilt driving means 9 comprising a cam gear 8 which is in contact with the projection 7a of the tilt movable member 7 and an inclined surface 8a of the cam gear 8.
Is configured by a leaf spring 10 or the like that presses and abuts the contact protrusion 7a so that the contact is made.

At the time of tilt correction, the cam gear 8 is driven to rotate by a motor (not shown) according to the correction amount. This rotation changes the contact position of the inclined surface 8a with the contact protrusion 7a of the tilt movable member 7. When the contact position changes in this manner, the tilt movable member 7 moves to the contact protrusion 7a.
With the biasing force of the leaf spring 10 acting on the optical disk, the optical disk is rotated about the rotation shaft 6 in a direction perpendicular to the disk surface of the optical disk (the direction of arrow B), and tilt correction is performed.

FIG. 10 is an exploded perspective view showing a schematic structure of another conventional optical disk drive having a tilt correction mechanism. The difference between the structure shown in FIG. 10 and the structure described based on FIG. 2 and the tilt movable member 7 are hingedly connected by a plate-like elastic member 11 whose longitudinal direction extends in the moving direction of the optical pickup 3, and the bearing 4, the leaf spring 5, and the rotating shaft 6 shown in FIG. The configuration is omitted. The other members are the same as those shown in FIG. 9, and the same reference numerals are given to the same members in FIG. 10, and the description will be omitted.

[0005]

In the conventional tilt correcting mechanism, in the configuration shown in FIG. 9, the tilt movable member 7 is rotatably supported by the combination of the bearing 4 and the rotary shaft 6 with respect to the base 2. However, in order to ensure the positional accuracy of the tilt movable member 7 in the radial direction and the thrust direction by this configuration, the diameter of the rotating shaft 6 must be thick to some extent. Was an obstacle.

In the configuration shown in FIG. 10, the plate-like elastic member 11 is used for supporting the tilt movable member 7 by the base 2.
, The thickness at this portion is small, but the space for fixing the elastic member 11 (S portion)
However, there is a problem that the width of the device is increased.

An object of the present invention is to solve the above-mentioned conventional problems and to provide an optical disk drive capable of reducing the space occupied by the tilt correction mechanism with a simple configuration.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an optical pickup for emitting a light beam to an optical disk to irradiate a light spot when recording / reproducing the optical disk, and a disk for the optical disk. An optical disc driving device having a tilt correction mechanism for correcting the posture of the optical pickup in a direction perpendicular to the surface so that the light beam emitted from the optical pickup is irradiated perpendicular to the disk surface of the optical disk , A torsion member twisted in a direction perpendicular to the disk surface of the optical disk, a first base having a constant inclination with respect to the optical pickup, and a constant inclination with respect to a turntable on which the optical disk is mounted. Connected to the second base,
The tilt correcting mechanism is configured such that the posture of the first base is inclined by the torsion of the torsion member. With this configuration, the torsion member connecting the first base and the second base is formed. Since the first base is rotated by being twisted, the space occupied in the height direction and the rotation axis direction in the connecting portion can be reduced.

Further, the present invention includes a posture restricting member for restricting an inclination posture of the first base by contacting the first base.
The torsion member is formed of a member that is elastically twisted, and the first base and the second base are connected in a state where the torsion member is twisted, and the first base is elastically twisted by the torsion member. The restoring force of the torsion member in the direction in which it comes into contact with the posture regulating member. With this configuration, the torsion member has both functions of the connecting means and the urging means, so that the number of parts can be reduced. it can.

Further, according to the present invention, the torsion member is made of resin, and is formed by outsert molding with respect to the first base and the second base. It is possible to set the positional relationship or the attitude relationship with the second base with high accuracy.

Further, according to the present invention, the first base, the second base, and the torsion member are formed of a plate-like member and are arranged in the same plane.
It is possible to make the whole thin.

Further, according to the present invention, when recording / reproducing an optical disk, a first base having a constant inclination with respect to an optical pickup for emitting a light beam to the optical disk and irradiating a light spot is mounted on the optical disk. A second base having a constant inclination with respect to the turntable is rotatably supported, and the first base is urged to rotate in one direction by an urging member. A tilt correction mechanism capable of restricting and changing the tilt posture of the first base by bringing the first base into contact with the first posture restricting member, and further, moving the second base with respect to the disk surface of the optical disk. The optical disc is supported so that it can be moved in the vertical direction, the optical disc can be attached and detached with the second base separated from the optical disc, and the optical disc can be turned with the second base close to the optical disc. An optical disk drive device having a disk attaching / detaching mechanism mounted on a cable, wherein the second base is in contact with the first base in a state where the second base is separated from the optical disk, and a second posture regulating member for regulating a tilt posture of the first base. With this configuration, when the tilt correction mechanism is moved below the device, the second posture regulating member regulates the posture of the first base as a stopper, and thus corresponds to the movable range of the first base. There is no need to secure a space below the device, and the device can be made thinner.

[0013]

FIG. 1 is an exploded perspective view of an optical disk drive for explaining a first embodiment of the present invention, and FIG. 2 is a perspective view showing an assembled state of the apparatus of FIG.

1 and 2, a turntable 11 on which an optical disk is mounted is fixed to a rotating shaft 12a of a spindle motor 12, and the spindle motor 12 is fixed to a front portion of a second base 13 made of a rectangular frame-shaped plate. Have been. In addition, an optical pickup 14 for incorporating various optical components and condensing a light beam to irradiate a light spot on the optical disk when recording / reproducing on the optical disk is provided.
The first base 15 made of a rectangular frame-shaped plate is supported so as to be movable in the radial direction of the optical disk (the direction of arrow A).

The first base 15 is installed in the internal space 13a of the second base 13, and both bases 13, 15
A plate-like torsion that is installed so that its longitudinal direction extends in a direction orthogonal to the moving direction A of the optical pickup 14 and whose both ends are fixed to the first base 15 and the second base 13, respectively. The first base 15 is rotatable with respect to the second base 13 in the direction B perpendicular to the disk surface of the optical disk by being connected by the member 16 and twisting the torsion member 16. .

The distance (inclination angle) between the second base 13 and the first base 15 is regulated at a portion of the first base 15 away from the torsion member 16 so that the first base 15 in the turning direction B is controlled.
A posture restricting means 17 composed of a cam gear 18 having an inclined surface 18a formed on a part thereof for changing the amount of restriction and a contact projection formed on the first base 15 is provided. 15a and the inclined surface 1 of the cam gear 18
The second base 13 is provided with a leaf spring 19 for urging the contact protrusion 15a so as to make contact with the contact base 8a.

In the first embodiment, the cam gear 18 is rotationally driven by a motor (not shown) via the intermediate gear 17a in accordance with the amount of correction in tilt correction. This rotation changes the contact position of the inclined surface 18a of the cam gear 18 with the contact protrusion 15a of the first base 15. When the contact position changes in this manner, the first base 15
Is rotated in a direction B perpendicular to the disk surface of the optical disk by receiving the urging force of the leaf spring 19 acting on the contact protrusion 15a and twisting the torsion member 16,
By setting the angle posture in that direction, tilt correction is performed.

Therefore, when recording / reproducing on / from the optical disk, first, the tilt of the optical disk with respect to the optical pickup 14 is detected by tilt detecting means (not shown), and the tilt is detected based on the detection signal from the tilt detecting means. By controlling the rotation of the cam gear 18 as described above, the attitude of the optical pickup 1 is controlled so that the optical disc and the optical pickup 14 are kept parallel to each other.
The control is performed so that the light beam emitted from the optical disk 4 irradiates the optical disk perpendicularly.

As described above, in the first embodiment, since the first base 15 and the second base 13 are connected by the plate-shaped torsion member 16, the first base 15 and the second base 13 are disposed substantially in the same plane as a whole. Therefore, the space occupied by the tilt correction mechanism in the apparatus can be made small and thin.

FIG. 3 is a perspective view of a torsion member in an optical disk drive according to a second embodiment of the present invention. This second embodiment is similar to the first embodiment shown in FIGS. As shown in FIG. 3, a torsion member 20 which is already twisted in the direction of the disk surface of the optical disk is used in place of the torsion member 16 and the leaf spring 19 in the first embodiment is used. It has a function and the leaf spring 19 is omitted.

The torsion member 20 is formed by plastically deforming a strip-shaped plate material having a high elasticity such as a leaf spring and twisting it under no load. The torsion angle of the torsion member 20 in the no-load state is set to be larger than the movable angle of the first base 15 in FIGS. 1 and 2 according to the first embodiment.

Since the angle formed between the first base 15 and the second base 13 in FIGS. 1 and 2 is closer to parallel than the torsion angle when the torsion member 20 is not loaded, the torsion member 20 is in an elastically deformed state. The first base 15 and the second base 13 are connected. The elastic force generated by the elastic deformation of the torsion member 20 causes the first base 15 to
3 is urged to rotate in a direction perpendicular to the disk surface of the optical disk.

As described above, in the second embodiment, the torsion member 20 functions as the rotation supporting means for connecting the first base 15 to the second base 13 and the function of the rotation urging means for the first base 15. Since the plate spring 19 is also used, the space can be saved and the number of parts can be reduced because the leaf spring 19 in the first embodiment can be omitted.

FIG. 4 is a perspective view showing a fixed portion of a torsion member in an optical disk drive according to a third embodiment of the present invention. This third embodiment is basically the same as the second embodiment. In this configuration, the leaf spring 19 in the first embodiment is omitted, and the torsion member 21 is different from the second embodiment.
And its fixing structure is different.

That is, the torsion member 21 has a flat plate shape, and a portion of the first base 15 and the second base 13 to which the torsion member 21 is attached by the screw 22 is:
The configuration differs from that of the second embodiment in that the female screw 23 is formed symmetrically on the diagonal line of the torsion member 21 and the projection 24 is formed symmetrically on another diagonal line different from the diagonal line.

In FIG. 4, the screw 22 is screwed into the female screw 23 so that the torsion member 21 is connected to the first base 15.
The two bases 13 and 15 are connected by being erected between the second base 13 and the second base 13, and a projection 24 is provided in the vicinity of the female screw 23. Is twisted in the vertical direction B with respect to the disk surface of the optical disk, so that the first base 15 is rotatably connected to the second base 13 at an angle. The direction of the angle formed by the first base 15 and the torsion member 21 is opposite to the direction of the angle formed by the second base 13 and the torsion member 21, and the torsion member 21 is elastically deformed into a twisted shape in the first direction. The base 15 and the second base 13 are connected. Then, the elastic force generated by the elastic deformation urges the first base 15 to rotate relative to the second base 13 in a direction perpendicular to the disk surface of the optical disk.

With such a configuration, the third embodiment has the same effect as the configuration of the second embodiment.

In general, the error tends to increase in the process of plastically deforming a material having high elasticity. Therefore, in the second embodiment, the torsion member 20 is formed by plastically deforming a strip-shaped material having high elasticity into a twisted shape. However, the torsion member 20 has a large variation in the torsion angle in the no-load state. Since the variation in the torsion angle in the no-load state results in the variation in the rotational urging force, it is necessary to set a large average rotational urging force in order to guarantee a predetermined rotational urging force. Increasing the rotation urging force causes adverse effects such as increasing the load on the motor for rotating and driving the cam gear 18 shown in FIGS.

In this regard, the torsion member 21 of the third embodiment
Has an effect that the above-described adverse effects do not occur because the shape in a no-load state is a planar shape.

FIG. 5 is a perspective view showing only a fixed portion of a first base, a second base and a torsion member in an optical disk drive according to a fourth embodiment of the present invention. The torsion member 30 is formed of a synthetic resin. In this example, the first base 15 and the second base 13 are used.
And both bases 13 and 1
5 are connected. The other configuration is the same as the configuration of the first embodiment, and performs the same operation as the operation of the first embodiment.

In the first embodiment, the position or orientation of the first base 15 with respect to the second base 13 on the xy plane is determined by the mounting error between the second base 13 and the torsion member 16 and the first base 15 and the torsion member. The mounting error with the mounting member 16 is added to increase the error. However, in the fourth embodiment, the relationship between the positions or postures of the first base 15 and the second base 13 is determined by the forming die, and the two bases 13, 15 are formed by the torsion member 30 formed by outsert molding.
, It is possible to perform highly accurate positioning and posture setting.

As shown in FIG. 6, by forming the torsion member 30 by outsert molding in a state where the first base 15 is inclined with respect to the second base 13, the first torsion is performed by the torsion member 30. By applying a rotational urging force to the base 15, the same operation and effect as in the second embodiment can be obtained, and the leaf spring 1 shown in FIGS.
9 can be omitted.

FIGS. 7A to 7C are cross-sectional views for explaining the configuration and operation of an optical disk drive according to a fifth embodiment in which a disk attaching / detaching mechanism is assembled to the tilt correction mechanism of the first embodiment. In the figure, members corresponding to those described in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description is omitted.

7A to 7C, reference numeral 35 denotes a support frame, and 36 denotes a loading position (FIG. 7A) of the optical disc D in the support frame 35 and an optical disc discharge position / optical disc setting position (FIG. 7A). 7 (c)), a disk transport tray which moves between 7 (c), 37 is a chucking pulley, 38 is an electronic circuit board fixed to the bottom of the support frame 35, and 39 is an electronic circuit on the contact projection 15a side of the first base 15. A stopper as an attitude regulating member protruding from the upper surface of the circuit board 38,
The support frame 35 supports the second base 13 so as to be able to move in the vertical direction in the figure and the disk transport tray 36 so as to be able to move laterally. Further, the support frame 35 holds the optical disk D by magnetically attracting the turntable 11. The king pulley 37 is supported.

FIG. 7A shows a loading state of the optical disk D. In this state, the second base 13 has been moved upward by a lifting means (not shown), and the disk transport tray 36 is positioned inside the support frame 35. And
The chucking pulley 37 holds and fixes the optical disk D with the turntable 11. In this state, the entire tilt correction mechanism is in the upper position, and as described with reference to FIGS. 1 and 2, the leaf spring 19 is formed by the contact projection 15 a formed on the first base 15 and the inclined surface of the cam gear 18. 18a
The contact projection 15a is urged so as to contact with the contact projection 15a.

When the second base 13 is moved downward by the elevating means from the state shown in FIG. 7A and the entire tilt correction mechanism is lowered, the state shown in FIG. The optical disk D separates from the chucking pulley 37 and rides on the disk transport tray 36. The lower surface of the first base 15 contacts the stopper 39 and the first base 15 pivots upward against the leaf spring 19, so that the contact protrusion 15a and the inclined surface 18a are separated, and the first base 15 is separated. 15 and the second base 13 are substantially parallel to the upper surface of the electronic circuit board 38.

Further, by moving the disk carrying tray 36 to the outside of the support frame 35 from the state shown in FIG. 7B, the state shown in FIG. 7C is reached, and the ejection of the optical disk D is completed. Can be set. The operation from FIG. 7B to FIG. 7A is performed for the operation of inserting the set optical disk into the support frame 35.

As described above, in the fifth embodiment, in the state where the tilt correction mechanism is moved below the support frame 35 in order to allow insertion and ejection of the optical disk D as described above, the first base 15 is Since the posture of contacting with the stopper 39 and moving downward is regulated, it is not necessary to secure a moving space corresponding to the movable range of the first base 15 in the electronic circuit board 38 in the support frame 35, Accordingly, the electronic circuit board 38 can be effectively used, and the space can be saved.

If the configuration of the fifth embodiment is not adopted, the first base 15 is moved downward by the leaf spring 19 as in the reference example (corresponding to the state of FIG. 7B) as shown in FIG. It is necessary to form a relief portion (concave portion) 40 for preventing the first base 15 from abutting on the electronic circuit board 38 in the inclined state in which the first base 15 is biased to contact the cam gear 18. The allowable use range of the electronic circuit board 38 is reduced.

[0040]

As described above, according to the optical disk drive of the present invention, the first base having a constant inclination with respect to the optical pickup and the inclination having a constant inclination with respect to the turntable on which the optical disk is mounted. Since the first base is rotated by twisting a torsion member for connecting to a certain second base, the height of the connection portion and the rotation axis direction at the connection portion are larger than those of the conventional tilt correction mechanism. The occupied space can be reduced.

Further, the first base and the second base are connected in a state where the torsion member is twisted, and the first base is attached in a direction in which the first base comes into contact with the posture regulating member by a restoring force of the elastic torsion of the torsion member. With the biasing configuration, the torsion member can have both functions of the connecting means and the biasing means, and the number of components can be reduced.

Further, by making the torsion member made of resin and performing outsert molding on the first base and the second base, the positional relationship or posture relationship between the first base and the second base during molding is enhanced. It is possible to set the accuracy.

Further, by forming the first base, the second base, and the torsion member by plate-like members and arranging them in the same plane, it is possible to make the whole thin.

Further, in a state where the tilt correction mechanism mounted on the optical disk drive is moved below the device,
Since the posture state of the first base can be regulated, it is not necessary to secure a space corresponding to the movable range of the first base below the device, and the thickness can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an optical disk drive for explaining a first embodiment of the present invention;

FIG. 2 is a perspective view showing an assembled state of the device according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a torsion member in an optical disk drive according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing a fixed portion of a torsion member in an optical disk drive according to a third embodiment of the present invention.

FIG. 5 is a perspective view showing only a fixed portion of a first base, a second base, and a torsion member in an optical disk drive according to a fourth embodiment of the present invention.

FIG. 6 is a side view for explaining a modification of the torsion member according to the fourth embodiment of the present invention.

FIGS. 7A to 7C are cross-sectional views illustrating a configuration and an operation of an optical disk drive device according to a fifth embodiment in a state where a disk attaching / detaching mechanism is assembled to the tilt correction mechanism according to the first embodiment;

FIG. 8 is a cross-sectional view of an optical disk drive as a comparative example for comparison with the configuration of the fifth embodiment of the present invention.

FIG. 9 is an exploded perspective view showing a schematic configuration of an optical disk drive device provided with a conventional tilt correction mechanism.

FIG. 10 is an exploded perspective view showing a schematic configuration of an optical disk drive device provided with another conventional tilt correction mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Turntable 12 Spindle motor 13 Second base 14 Optical pickup 15 First base 15a Contact projection of first base 16, 20, 21, 30 Torsion member 17 Attitude regulating means 18 Cam gear 18a Inclined surface of cam gear 19 Plate Spring 35 Support frame 36 Disk transport tray 37 Chucking pulley 38 Electronic circuit board 39 Stopper

Claims (5)

[Claims] An optical pickup that emits a light beam to an optical disk to irradiate a light spot when recording / reproducing an optical disk, and tilts the optical pickup in a direction perpendicular to a disk surface of the optical disk. In an optical disk drive having a tilt correction mechanism that corrects a light beam emitted from an optical pickup so as to be irradiated perpendicularly to the disk surface of the optical disk, the optical beam is twisted in a direction perpendicular to the disk surface of the optical disk A first base having a constant inclination with respect to the optical pickup and a second base having a constant inclination with respect to a turntable on which the optical disc is mounted, by a torsion member;
An optical disk drive, wherein a tilt correcting mechanism is configured so that the posture of the first base is inclined by the torsion of the torsion member. 2. The apparatus according to claim 1, further comprising: a posture regulating member that regulates an inclination posture of the first base by contacting the first base, wherein the torsion member is formed of a member that can be elastically twisted, and the torsion member is provided. The first base and the second base are connected in a twisted state, and the first base is urged in a direction in which the first base comes into contact with the posture regulating member by a resilient torsion restoring force of the torsion member. Item 2. An optical disk drive according to item 1. 3. The optical disk drive according to claim 1, wherein the torsion member is made of resin, and is formed by outsert molding with respect to the first base and the second base. apparatus. 4. The optical disk drive according to claim 1, wherein the first base, the second base, and the torsion member are formed of a plate-like member, and are arranged in the same plane. . 5. A first base having a constant inclination with respect to an optical pickup for emitting a light beam and irradiating a light spot to the optical disk when recording / reproducing the optical disk is used as a turntable on which the optical disk is mounted. The first base is pivotally supported by a biasing member so as to rotate in one direction by a second base having a constant inclination with respect to the first base, and the first base is biased by the biasing member. A tilt correction mechanism capable of restricting and changing the inclination posture of the first base by bringing the base into contact with the first posture regulating member, and further comprising the second base substantially perpendicular to the disk surface of the optical disk; The optical disc is mounted on a turntable while the second base is separated from the optical disc, and the optical disc can be attached and detached while the second base is close to the optical disc. An optical disk drive device having a disk mounting / dismounting mechanism for mounting thereon, wherein the second base is in contact with the first base in a state where the second base is separated from the optical disk, and a second posture regulating member for regulating a tilt posture of the first base is provided. An optical disk drive characterized by the above-mentioned.