JP2001229548A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device capable of facilitating adjustment by the adjusting mechanism of a traverse mechanism, and preventing creeping caused by an adjusting spring force even on a synthetic resin chassis. SOLUTION: By the traverse adjusting mechanism of the traverse mechanism, cam members 32 and 34 having eccentric cams are fixed to both ends of a shaft 14, and a plate spring for pressing a shaft end part is held by U-shaped holding members. Thus, adjustment is facilitated, the direct pressing of an adjust spring force to a synthetic resin chassis is prevented and thereby creeping hardly occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc apparatus for irradiating an optical disc, which is an optical recording medium, with a light beam with a high accuracy to record or reproduce information.

[0002]

2. Description of the Related Art In recent years, an optical disk apparatus having a traverse mechanism for driving and controlling an optical head for irradiating a light beam in a radial direction of the optical disk has been used as a computer peripheral (CD-R).
OM, magneto-optical disk, phase change disk, etc.), AV equipment (CD, VideoCD, video disk, DVD, etc.)
And the like as key components of information storage and playback devices. In particular, as the information storage / reproducing device becomes lighter and thinner, the optical disk device is required to be smaller and lighter.
Reliability and assemblability have also been emphasized.

Hereinafter, a conventional optical disk device will be described with reference to the drawings.

FIG. 10 is a perspective view showing the structure of a conventional optical disk device, which is a partially sectional perspective view, and FIG. 11 is a schematic sectional view showing the same, which is cut by a broken line V in FIG.

In FIGS. 10 and 11, reference numeral 1002 denotes a chassis which is formed by a sheet metal press. On the chassis 1002, there is provided a spindle motor 1004 in which a turntable 1003 is press-fitted to a rotating shaft. The disc 0 is placed on the turntable 1003 and rotated by the spindle motor 1004.

The optical pickup 1006 is guided by a pair of guide shafts including a main shaft 1007a and a sub shaft 1007b so as to be movable in a radial direction of the disk 0, and irradiates a light beam to the disk 0 which is rotated by a spindle motor 1004 to transmit information. Record and play back. The main shaft 1007a is fixed by the fixing portion 1008 so that the vicinity of the inner peripheral end of the disk becomes a fulcrum. The main shaft 1007a is vertically movable near the outer peripheral end while regulating the position in the left-right direction. . Sub shaft 1
Reference numeral 007b is disposed movably in the vertical direction in the vicinity of the inner peripheral end and the outer peripheral end of the disk, while regulating the position in the left and right directions by the inner and outer shaft supports 1013 and 1011.

That is, as shown in FIGS. 10 and 11, a spring 1009 is provided between the outer periphery of the sub-shaft 1007b and the chassis 1002 to push the sub-shaft 1007b upward. In order to resist this force, the sub shaft 1007b near the spring 1009
An adjustment screw 1010 is in contact with the screw tip from above. The adjusting screw 1010 is screwed and supported by an outer peripheral shaft receiver 1011 fixed to the chassis 1002.
When the adjusting screw 1010 is rotated by the rotating jig 1012, the adjusting screw 1010 moves up and down relatively with respect to the chassis 1002, and the sub shaft 1007b pressed against the adjusting screw 1010 by the spring 1009 is moved relative to the chassis 1002 on the disk outer peripheral side. Move slightly up and down.

Similarly, at the inner peripheral end of the sub-shaft 1007b, an inner peripheral shaft receiver 1013 for regulating the position of the shaft in the left-right direction is fixed to the chassis 1002, and between the inner peripheral shaft receiver 1013 and the sub-shaft 1007b. A spring 1014 is provided and the sub shaft 100
7b is pushed down. A spring 1009 is provided between the sub-shaft 1007b and the chassis 1002.
Is pushed upward. In order to resist this force, an adjusting screw 1015 abuts at the tip of the screw from below the sub-shaft 1007b near the spring 1014. Adjustment screw 1
015 can be finely moved up and down relative to the chassis 1002 on the inner peripheral side of the disk by rotating an adjustment screw 1015 screwed and supported by the chassis 1002 with a rotating jig 1016.

The outer peripheral end of the main shaft 1007a has the same configuration as the outer peripheral end of the sub shaft 1007b. By rotating the adjusting screw 1017, the shaft is rotated relative to the chassis 1002 on the outer peripheral side of the disk. Can be slightly moved up and down.

Reference numeral 1018 denotes a lead screw having a spiral groove 1018a on a cylindrical surface and a spindle motor 1018 so as to be substantially parallel to the main shaft 1007a.
04 is rotatably supported by the thrust bearing portion 1021 of the fixed portion 1008, and the other end 1022 is inserted into the bearing portion 1023 and rotatably supported by the thrust bearing portion 1023. The gear 1024 is fixed. Reference numeral 1025 denotes a traverse motor. A small gear 1026 is fixed to a rotation shaft of the traverse motor.
Traverse motor 1008 is fixed to chassis 1002 so that 24 engages.

The spiral groove 101 of the lead screw 1018
8a includes a nut 1 provided on the optical pickup 1006.
027 is engaged. The lead screw 1018 is rotated by the traverse motor 1025, whereby the nut 1027 is sent in parallel to the lead screw 1018 along the spiral groove 1018a, and accordingly, the optical pickup 1
006 moves in the radial direction of the loaded disc.

Reference numeral 1030 denotes a flexible printed circuit board (hereinafter abbreviated as "flexible"), which supplies a signal to the optical pickup 1006 through a very flexible connection line as is well known. That is, the flexible 1030 is formed into a “U” shape, and one end thereof is connected to the sub shaft 1 of the pickup 1006.
The connector 1 is fixed to the side of the 007b side and connected to an electronic circuit (not shown) in the pickup 1006, and the other end is provided inside the side of the chassis 1002 facing the other side.
032, whereby a signal is supplied to the optical pickup 1006 from a pickup control circuit (not shown). Further, since the flexible 1030 is flexible, the optical pickup 1006 does not become a resistance to the radial movement of the disk.

Reference numeral 1002a denotes a chassis fixing portion which is bent from the side surface of the chassis 1002 and has three units. In particular, one unit is provided near each of the spindle motor 1003 and the traverse motor 1008. The information storage / reproducing device is fixed to a frame (not shown), an exterior (not shown), or the like by the chassis fixing portion 1002a.

The operation of the optical disk device configured as described above will be described below.

First, the spindle motor 1004 is rotated so that the disc 0 mounted on the turntable 1003 is rotated.
To rotate. Subsequently, the lead screw 1018 is rotated by the traverse motor 1025. Thereby, the nut 1027 engaging with the spiral groove 1018a of the lead screw 1018 is sent in the axial direction of the lead screw 1018. With this, the nut 1027 is fixed, and the optical pickup 1006 guided slidably in the disk radial direction by the guide shafts 1007a and 1007b is sent in the disk radial direction. Thus, the optical pickup 1006 can be moved to the vicinity of a track on an arbitrary disc to read or write information on the track.

As is well known, the disk 0 is usually made of a synthetic resin, and has a slight warp when it is mounted on the turntable 1003. Optical pickup 10
06 has a residual for adjusting the tilt of the optical axis, the spindle motor 1004 has a tilt of the axis, and the chassis 1
002 has warpage. Due to this warpage, shaft tilt, and adjustment residual, the normal of the disk surface and the optical pickup 100
The optical axis 6 has an inclination. This gradient has a correlation with the fluctuation component jitter of the reproduction signal in the time axis direction. The jitter increases as the gradient increases, and the jitter increases as the gradient increases. Therefore, in order to secure the margin of the system, the guide shaft disk 0
Must be as small as possible.

In order to adjust the relative inclination between the optical pickup 1006 and the disc 0 and to secure a system margin, first, the radial direction of the disc 0 parallel to the guide shaft (hereinafter referred to as the radial direction (R direction)). ), The two adjustment screws 1010 and 1015 at both ends of the sub shaft 1007b are held parallel to the guide shaft so as to correct the inclination in the direction perpendicular to the direction (hereinafter referred to as the tangential direction (T direction)). At the same time, the shaft is finely moved up and down to adjust the T direction. In order to further correct the inclination adjustment in the R direction, the adjusting screw 101 on the outer peripheral end of the disk of the main shaft 1007a and the sub shaft 1007b is used.
7, 1010, the rear part of each shaft is simultaneously finely moved up and down to adjust in the R direction. With the tilt adjusting mechanism for adjusting the tilt, the relative tilt between the optical pickup 1006 and the disc can be adjusted, and the margin of the system can be secured.

The adjusting screw 1015 is screwed to a shaft receiver 1011 fixed to the chassis 1002 with a screw 1016. When the adjusting screw 1015 rotates, the height of the tip of the adjusting screw 1015 with respect to the chassis 1002 changes. Guide shaft 10
06 is pushed upward by a spring 1014 at the outer peripheral end of the disk, and is pressed against the adjusting screw 1015. Therefore, when the height of the tip of the adjusting screw 1015 changes, the guide shaft 100 that is in contact with the tip of the adjusting screw 1015 changes.
The height of 6 changes. Since one end of the guide shaft 1006 is fixed on the inner peripheral side of the disk, the guide shaft 1006 rotates vertically with the fixed end as a fulcrum, and changes the inclination with respect to the disk. With the tilt adjusting mechanism for adjusting the tilt, the relative tilt between the optical pickup 1006 and the disc can be adjusted, and the margin of the system can be secured.

[0019]

However, the above-mentioned conventional configuration has the following problems.

First, the tangential (T) of the disk
In order to correct the tilt between the optical axis of the optical pickup and the recording surface of the disk in the direction, the adjusting screws must be adjusted at the same amount of movement at two places at both ends of the sub shaft at the same time.
When making adjustments for repairs, etc., it is difficult to make adjustments, it takes a long adjustment time, and even when making adjustments with production jigs, etc., the production jigs can be large and complicated, so the production jigs are expensive. Was.

Next, when the chassis is made of synthetic resin in order to cope with the reduction in size and weight of the apparatus and the cost reduction in response to portable equipment, the reaction force of the adjusting spring is always applied to the chassis. Since the adjustment is shifted due to the deformation due to the creep, there is a problem that it is difficult to secure the margin of the system.

The present invention solves the above-mentioned conventional problems, and provides an optical disk device which can facilitate adjustment, shorten the adjustment time, simplify the adjustment equipment, and realize small size, light weight and low cost. The purpose is to provide.

[0023]

In order to achieve this object, an optical disk apparatus according to the present invention comprises: a rotation driving means for rotating a disk-shaped recording medium; and a reproducing or recording / reproducing signal of the disk-shaped recording medium. Pickup means for moving the optical pickup means in the radial direction of the disk-shaped recording medium, guide means for guiding the movement of the optical pickup means, rotation driving means, optical pickup means, moving means and guide And a guide member. The guide member has a first shaft member that fits into a bearing portion of the optical pickup device, and a second shaft member that is disposed substantially parallel to the first shaft member. A cylindrical cam member having an eccentric hole formed therein for fitting with the shaft member is fixed to both ends of the second shaft member,
By rotating the cam member, the optical axis of the optical pickup means with respect to the recording surface of the disc-shaped recording medium can be adjusted in a direction perpendicular to the radial direction of the disc-shaped recording medium.

With this configuration, the relative inclination between the optical pickup and the disk can be easily adjusted, so that the adjustment time can be shortened and the adjustment equipment can be simplified.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk drive according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a plan view of an optical disk device according to Embodiment 1 of the present invention from the upper side (that is, the disk mounting surface side), FIG.
FIG. 4 is a perspective view showing an engagement means between an optical pickup and a lead screw, FIG. 4 is a perspective view showing the configuration of a drive unit and a second shaft unit, FIG. 5 is a perspective view showing a second shaft unit, and FIG. , FIG. 7 is a side view showing an adjustment structure of the second shaft member, FIG. 8 is a perspective view showing the first shaft member and the optical pickup, and FIG. 9 shows an adjustment structure of the first shaft portion. It is a perspective view.

In FIG. 1, FIG. 2 and FIG.
A chassis member on which traverse parts are arranged,
It is a molded article of synthetic resin. A spindle motor 12 press-fitted around a turntable 11 as a rotation driving means as an axis is fixed to the chassis member 10. The chassis member 10 has a pair of first shaft members 1 serving as guide means.
3 and a second shaft member 14 are provided.

The first shaft member 13 and the second shaft member 14 can slide an optical pickup means 16 for reproducing or recording / reproducing information from / on a disc 0 which is a disc-shaped recording medium in the radial direction of the disc 0. I support it.

As shown in FIG. 3, a leaf spring member 17 is fixed to the optical pickup means 16 with screws 18, and a nut 19 is held between the leaf spring member 17. Further, a part of the leaf spring member 17 is formed in a U-shape, and is in contact with the first shaft member 13 at the curved part 17a having the U-shape. This is intended for electrical continuity between the first shaft member 13 and the optical pickup means 16. Even if the chassis member 10 is made of a synthetic resin and has no electrical continuity, the spindle motor 1 is connected to the inner peripheral end of the first shaft member 13 via the ground connection member 20.
2 and the optical pickup means 16 are electrically connected to each other so that a so-called ground can be taken for measures against static electricity, unnecessary radiation, and the like.

The nut 19 is connected to the first shaft 13
, And is engaged with a lead screw 20 which forms a moving means and has a spiral groove formed in a cylindrical surface. As shown in FIGS. 2 and 4, a screw gear 22 constituting a moving means is fixed to one end of the lead screw 20, and the screw gear 22 is attached to a motor shaft 24 of a motor member 23 constituting the moving means. Meshes with a motor gear 25 which is one of the press-fitted moving means,
The rotational force from the motor member 23 is transmitted to the screw gear 22 via the relay gear 26 meshing with the motor gear 23 in a reduced manner, and transmitted to the lead screw 20. The motor member 23, the relay gear 26, and the screw gear 22 are disposed in respective grooves formed in the chassis member 10, and the vertical position is regulated by the motor cover 27.
7 is fixed to the chassis member 10 by screws 28a and 28b.

The basic operation of the optical disk apparatus configured as described above will be described below. First, the spindle motor 12 is rotated to turn the turntable 11.
Is rotated. Subsequently, the lead screw 21 is rotated by the motor member 23 via the motor gear 25, the relay gear 26, and the screw gear 22. Thereby, the nut 19 engaged with the lead screw 21 is sent in the axial direction of the lead screw 21. Accordingly, the nut 19 is fixed, and the first shaft 1
The optical pickup means 16 guided slidably in the disk radial direction by the three members and the second shaft member 14 is fed in the disk radial direction. As a result, the optical pickup means 16 can be moved to the vicinity of an arbitrary track on the disk 0 to read or write information on an arbitrary track on the disk 0.

In recent years, the recording density of a disk has been increased, and an information storage device for reading and writing the data has also been required to have high accuracy. In the case of an optical disk, the inclination accuracy of the optical axis between the disk recording surface and the pickup needs to be particularly high, and this requirement is not satisfied with the accuracy of mass-productive processing.

Next, the adjustment structure will be described with reference to FIGS. D-cut portions 30a and 30b are formed at both ends of the second shaft member 14, respectively, and semicircular hole grooves 31 for press-fitting the D-cut portions 30a and 30b at one end on the inner peripheral side of the disk. The cam member A32, which is one of the cam members on which the second shaft member 1 is formed,
4 is fixed to one end. At the other end of the second shaft member 14, a cam member B34, which is also one of the cam members having a semicircular hole groove 33, is fixed. The cam member A32 has a cylindrical convex portion 37 which fits into a hole portion 36 formed in an adjusting leaf spring A35 as a second biasing member disposed on the outer peripheral portion of the disk of the second shaft member 14. The cam member B34 has a chassis member 1
Cylindrical projection 39 that fits into the hole 38 formed in
Are formed.

In particular, the cam member A32 and the cam member B3
The center of the cylindrical projections 37, 39 of the fourth and the centers of the semicircular grooves 37, 39 to be fitted at both ends of the second shaft member 14 are eccentric, and are rotated by rotating the cam member. The height of the second shaft member 14 can be changed, thereby enabling the adjustment of the disc and the optical axis of the optical pickup in the T direction. As shown in FIGS. 4, 5 and 6, radial projections 40 are provided at substantially equal angular intervals on the end surfaces of the cam member B34 other than the cylindrical projections 39 which are in contact with the holes 38 of the chassis member 10. The projection 41 is formed in the vicinity of the hole of the chassis member so as to engage with the groove between the radial projections 40. Further, the cam member B34 has a rectangular convex portion 42 formed on an outer portion thereof, and the shaft can be rotated using the rectangular convex portion 42. Further, a square hole 43 is provided on an end face of the cylindrical convex portion 39 so that the cylindrical convex portion 39 can be rotated using a wrench or the like. Further, the cam member B34 is urged in the thrust direction of the shaft by an adjusting leaf spring A35. Thereby, for adjustment, the second shaft member 14 and the radial protrusion 40 are locked at every pitch so that a click feeling is provided. Of course, it is needless to say that the image is divided into multiple parts with an adjustment accuracy that does not affect the performance. By this rotation locking, when the jig is released after the adjustment with the jig or the like, the rotation is not deviated due to catching or the like, and stable adjustment can be performed.

By the way, as shown in FIG.
The cylindrical projection 37 of 32 is engaged with the hole 36 formed in the adjustment leaf spring A35, and the adjustment leaf spring A25 is a second U-shaped sheet metal provided with an adjustment screw 44.
The biasing portion 46 formed on the adjustment leaf spring A35 is in contact with the "U" -shaped one end surface 47 of the second holding member 45. ,
Further, the adjusting screw 44 abuts on a screw abutting portion 48 formed on the second holding member 45, and a biasing force is applied inside the “U” shape of the second holding member 45. No spring force is applied directly to the resin chassis member,
No deformation of the chassis member 10 due to creep or the like of the synthetic resin occurs. Further, the wall portion 49 formed on the chassis member 10 and the bent portion 5 formed on the adjustment leaf spring A35.
The second shaft member 14 is urged in the thrust direction by the contact urging with zero. The second holding member 45 is fixed by a screw 52 at a boss 51 formed on the chassis member 10.

Next, as shown in FIGS. 8 and 9, the cylindrical projection 5 formed at one end of the first shaft member 13 to be fitted with the bearing of the optical pickup means 16.
5 is fitted with a hole 57 formed in an adjustment leaf spring B56 as a first urging member, and the other end of the first shaft member 13 is formed with a hole 5 formed in the chassis member 10.
8 A "U" -shaped first holding member 59 is provided on the chassis member 10 so as to sandwich the adjustment leaf spring B56, and is fixed with a screw 61 at a boss portion 60 formed on the chassis member 10. Have been. Also,
An adjusting screw 62 is provided on the first holding member 59, and an end 63 of the adjusting screw 62 abuts on an abutting surface 64 of the adjusting leaf spring B 56. The abutting portions 65 and 66 formed on the adjusting leaf spring B56 are in contact with the U-shaped end surface, and are provided between the abutting portions 65 and 66 and the abutting portions 64 of the adjusting screws. It is generating power. The regulation of the adjustment leaf spring B56 in the shaft axis direction is regulated by a regulation portion 67 formed on the chassis member 10. Further, the adjusting leaf spring B56 simultaneously applies the axial bias of the lead screw 21 to the adjusting leaf spring B5.
6 at the screw biasing surface 68. In addition, like the second holding member 45 described above, the first holding member 59 is also “
Since the urging force is applied inside the U-shape, no spring force is applied directly to the chassis member made of synthetic resin, and the chassis member 10 does not deform due to creep of the synthetic resin or the like.

[0037]

As described above, according to the present invention, there are provided a rotary drive means for rotating a disk-shaped recording medium, an optical pickup means for reproducing or recording / reproducing a signal on the disk-shaped recording medium, and an optical pickup means. Moving means for moving the optical disc in the radial direction of the disc-shaped recording medium, guide means for guiding the movement of the optical pickup means, and a chassis member provided with the rotation driving means, the optical pickup means, the moving means and the guide means. The guide means has a first shaft member which fits into the bearing of the optical pickup means, and a second shaft member disposed substantially parallel to the first shaft member, and is provided at both ends of the second shaft member. Is fixed to a cylindrical cam member having an eccentric hole portion to be fitted with the shaft member, and is rotated at right angles to the radial direction of the disc-shaped recording medium by rotating the cam member. To the direction, it has a configuration that enables adjusting the optical axis of the optical pickup means with respect to the recording surface of the disc-shaped recording medium.

With this configuration, the relative inclination between the optical pickup and the disc can be easily adjusted, so that the adjustment time can be shortened and the adjustment equipment can be simplified.

Further, of the cam members fixed to both ends of the second shaft member, a convex portion is formed on an end surface of one of the cam members so as to fit into a hole formed in the chassis member. A plurality of radial projections are formed at equal angular intervals on the surface that is in contact with the chassis member other than the projections,
By forming at least one or more protrusions on the opposing surface of the chassis member so as to engage with the radial protrusions, when the jig is released after being adjusted with a jig or the like, the rotation is not deviated due to catching or the like, Stable adjustment can be performed.

The first and second holding members, the first and second holding members, and the first and second shafts each having a U-shape that sandwich one end of the first and second shaft members. The chassis is made of synthetic resin in order to cope with a reduction in the size and weight of the apparatus and a reduction in the price by comprising the first and second urging members disposed on the holding member so as to urge one end of the member. Even in this case, since the reaction force of the adjustment spring is not applied to the chassis, an excellent effect that a margin of the system can be secured without deviation of the adjustment due to deformation due to synthetic resin creep can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view from above of an optical disc device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the configuration of the same from below.

FIG. 3 is a perspective view showing an engagement means between the optical pickup and a lead screw.

FIG. 4 is a perspective view showing the configuration of a drive unit and a second shaft unit.

FIG. 5 is a perspective view showing the second shaft portion.

FIG. 6 is a perspective view showing the cam A;

FIG. 7 is a side view showing an adjustment structure of a second shaft portion according to the first embodiment.

FIG. 8 is a perspective view showing a first shaft member and an optical pickup according to the first embodiment;

FIG. 9 is a perspective view showing an adjustment structure of a first shaft portion according to the first embodiment.

FIG. 10 is a perspective configuration diagram of a conventional optical disk device.

FIG. 11 is a schematic sectional view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Chassis member 12 Spindle motor 13 1st shaft member 14 2nd shaft member 15 Disk 16 Optical pick-up means 17 Leaf spring member 19 Nut 20 Earth connection member 21 Lead screw 22 Screw gear 23 Motor member 25 Motor gear 26 Relay gear 27 Motor Cover 32 Cam member A 34 Cam member B 35 Adjusting leaf spring A 40 Radial convex part 45 Second holding member 56 Adjusting leaf spring B 59 First holding member

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D068 AA02 BB01 CC03 EE17 GG06 GG14 5D117 CC01 CC04 CC07 JJ10 JJ13 JJ15 KK01 KK08 KK10 KK21 KK22 KK25

Claims (5)

[Claims] 1. A rotation driving means for driving a disk-shaped recording medium to rotate, an optical pickup means for reproducing or recording / reproducing a signal of the disk-shaped recording medium, and a method for driving the optical pickup means to the disk-shaped recording medium Moving means for moving the optical pickup means in the radial direction, a guide means for guiding the movement of the optical pickup means, a chassis member provided with the rotation driving means, the optical pickup means, the moving means and the guide means, A first shaft member that fits into a bearing of the optical pickup unit;
A cylindrical member having a second shaft member disposed substantially parallel to the first shaft member and having eccentric holes formed at both ends of the second shaft member to be fitted with the shaft member; A cam member is fixed, and by rotating the cam member, the optical axis of the optical pickup means with respect to the recording surface of the disc-shaped recording medium can be adjusted in a direction perpendicular to the radial direction of the disc-shaped recording medium. An optical disk device characterized by the following configuration. 2. A cam member fixed to both ends of a second shaft member, a convex portion is formed on an end face of one of the cam members so as to fit into a hole formed in the chassis member. A plurality of radial protrusions are formed at equal angular intervals on a surface of the chassis member other than the protrusions that are in pressure contact with the chassis member, and at least one or more protrusions are engaged with the radial protrusions. 2. The optical disk device according to claim 1, wherein the optical disk device is formed on surfaces facing each other. 3. A disk drive for rotating a disk-shaped recording medium, an optical pickup for reproducing or recording / reproducing a signal on the disk-shaped recording medium, and a disk-shaped recording medium. Moving means for moving the optical pickup means in the radial direction, a guide means for guiding the movement of the optical pickup means, a chassis member provided with the rotation driving means, the optical pickup means, the moving means and the guide means, The guide means has a first shaft member which fits into a bearing part of the optical pickup means, and a second shaft member disposed substantially in parallel with the first shaft member. By moving one end of the shaft member on the outer peripheral side of the disk-shaped recording medium to incline the shaft member, the output optical axis of the optical pickup means is moved to the disk. A first and a second U-shaped holding member sandwiching one ends of the first and second shaft members, and An optical disk device comprising: first and second holding members; and first and second urging members disposed on the holding members so as to urge one ends of the first and second shaft members. . 4. The optical disk device according to claim 3, wherein the first and second holding members are made of sheet metal. 5. The moving means is provided in a lead screw having a spiral groove formed in a columnar surface substantially parallel to the first shaft member, a driving means for rotating and driving the lead screw, and the optical pickup means. And engaging means for engaging the helical groove and transmitting a driving force from the lead screw to the optical pickup means, wherein the first biasing member is provided together with a bias of the first shaft member. 5. The optical disk device according to claim 3, wherein said one end surface of said lead screw is urged in a thrust direction.