JPH10125016A - Adjuster in disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adjuster in a disk apparatus capable of setting a vertical degree of an optical axis to a recording face of a disk with high precision and simplification, and further of a adjusting a height position of an optical head. SOLUTION: Both end parts of a guide member 15 are held by holding members 21, 22, which are elastically biased to a Z-axial (+) direction by a leaf spring 23, and a Z-axial location can be adjusted by an adjusting spring 24. Thereby, a parallel degree of guide members 14, 15 and a tangential tilt adjustment for a rotary shaft 11a are enabled. Further, an adjustment pedestal 30 supporting a motor 11 is adjusted radially by an adjustment screw 31, whereby the rotary shaft 11a and an optical axis can be set parallel with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a CD, a CD-RO
The present invention relates to disk devices such as M and DVD, and more particularly to an adjustment device for a disk device capable of setting the optical axis of a head and the recording surface of a disk vertically with high accuracy.

[0002]

2. Description of the Related Art FIG. 5 is a partial side view showing a disk support portion of a conventional CD player, and FIG. 6 is a partial side view showing a state where a rotation axis of a motor is inclined with respect to a mounting surface of the motor. 7 is a side view showing a conventional motor shaft adjusting device. In FIG. 5, a spindle motor 1 for rotating a disk D is fixed by screws 7 with a pedestal 2 interposed between the spindle motor 1 and a mechanical chassis 6. Turntable 3
Are supported by a rotating shaft 1a of the spindle motor 1. The disk D is set on the turntable 3 and is driven to rotate by the motor 1.

An optical head 8 for reading information recorded on a disk D is provided along a guide member 5 so as to be slidable in the X-axis direction in the figure. The optical head 8 focuses laser light from a light source (not shown) by an objective lens 9 and irradiates the pits D1 on the surface of the disk D. The intensity of the return light is modulated by the pit D1, and is detected by the light receiving element to detect a signal. In the optical head 8, a tracking servo for following a track is performed by finely moving the objective lens 9 in the tracking direction, and a focus servo is performed by finely moving the objective lens 9 in the optical axis direction.

In a disk player of this type, an objective lens 9 is provided on the recording surface (pit D1 forming surface) of the disk D.
Are preferably perpendicular to each other. For that purpose, it is necessary that the rotating shaft 1a of the motor 1 be assembled so as to maintain a high degree of parallelism with respect to the optical axis OO. For example, as shown in FIG. 6, the rotation axis 1a is
When the disk D is tilted with respect to the parallel line O1-O1, the turntable 3 is not maintained perpendicular to the optical axis OO, so that the disk D mounted on the turntable 3 is also rotated in the tilted posture. Therefore, the optical axis OO of the objective lens 9
Is not illuminated perpendicularly to the recording surface of the disk D, and the laser beam spot formed on the recording surface is distorted, thereby lowering the detection accuracy of the pit D1.
Here, the rotation axis 1a is a parallel line O1-O1 of the optical axis OO.
The cause of the inclination with respect to is a result of the accumulation of the dimensional tolerance of each part. In order to correct this inclination, as shown in FIG. 7, the rotation axis 1a is made to coincide with the parallel line O1-O1, that is, a spacer S is interposed at a predetermined position between the motor 1 and the pedestal 2. Is performed to set the parallelism of the rotation axis 1a with respect to the optical axis OO.

FIG. 8 is a perspective view showing a conventional guide member support mechanism. Guide member 5 shown in FIGS. 5 and 6
Is supported by a support mechanism as shown in FIG. 8, for example. That is, the support 6a and the support 6b are fixedly provided on the mechanism chassis 6. One end face of the guide member 5 is inserted and held in a support hole 6a1 formed in the support 6a, and the other end of the guide member 5 is supported by a concave portion 6b1 provided on the support base 6b. Support 6
In b, a screw 10b is inserted into a mounting hole 10a of a leaf spring 10 bent in a crank shape, and is screwed into a screw hole 6b2 formed in a support base 6b. The end of the guide member 5 is pressed by the elastic force of the leaf spring 10 and is fixed to the recess 6b1 of the support base.

[0006]

However, in the disk device having the above structure, the parallelism between the axis of the rotary shaft 1a supporting the turntable 3 and the optical axis OO of the objective lens 9 is set with high precision. In order to do so, it is necessary to adjust the rotation shaft 1a two-dimensionally in both the radial direction (falling in the X direction) and the tangential direction (falling in the Y direction). Further, when the parallelism of the pair of guide members 5 supporting both sides of the optical head 8 is out of order, that is, when the axes of the pair of guide members 5 are arranged so as to be mutually twisted, Moves along the guide member 5, the optical axis OO tilts in accordance with the position, and the parallel state with the rotating shaft 1a cannot be always maintained.

When the optical axis 1a is inclined in the tangential direction (Y direction) by the spacer S, the distance between the objective lens 9 of the optical head 8 and the recording surface of the disk D changes. May be shorter. When this distance becomes shorter, the working distance of the objective lens 9 and the disk D
Of the recording surface becomes large, and it becomes necessary to perform an unnecessary focus correction operation, which adversely affects the focus servo operation. In addition, the weight of the head of the conventional disk drive for CD is relatively light. However, DV
For a D (Digital Versatile Disk) or the like, the head tends to be heavier than a CD. Therefore, the conventional support structure shown in FIG. 8 cannot withstand an accident such as dropping during transportation, and the instantaneous impact force becomes larger as compared with the conventional one due to the increased weight of the head. 5 comes off from the recess 6b1 or the leaf spring 1
0 may be deformed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to set the perpendicularity between an optical axis and a recording surface of a disc with high accuracy and easily. It is an object of the present invention to provide an adjusting device in a disk device that can also adjust the size of the disk device.

Further, the present invention provides an adjusting device for a disk drive in which the holding strength of a guide member is increased to prevent the guide member from coming off when an excessive impact is applied. It is intended to be.

[0010]

SUMMARY OF THE INVENTION An adjusting device according to the present invention comprises a pair of guide members provided in parallel on a chassis at a predetermined interval, and both ends supported by the guide members and along the guide members. In a disk device provided with a moving read or write head, both holding members holding both ends of at least one guide member are perpendicular to the moving direction of the head with respect to a support fixed to the chassis side. The holding member is urged in a direction away from the chassis side by an elastic member, and the holding member is screwed to the support table, and the amount of tightening of the screw is adjusted. By
The position of the holding member in the guide direction is set.

In the above, it is preferable that the holding member is fitted to the support table so that it can slide only in the guide direction.

Further, in the present invention, in addition to the above structure, the rotation axis of the turntable on which the disk is installed can be adjusted so as to be tilted only in the moving direction of the head. It is preferable that an adjusting device capable of adjusting the tilt only in the radial direction is provided.

As shown in FIG. 1, each of the pair of guide members according to the present invention is a guide shaft or a guide rail for guiding the optical head. Alternatively, one of the guide members (the guide member on the main side) may be, for example, a screw shaft which also serves as a feed mechanism for moving the optical head.

The adjusting device of the present invention can adjust the height positions of both ends of at least one guide member from the chassis. That is, the height of both ends of one guide shaft from the chassis side can be adjusted individually. Alternatively, both ends of both the pair of guide members may be attached so that the height position from the chassis side can be adjusted.

In the adjustment operation, the height positions of both ends of the other guide member are adjusted with reference to the guide member on the main side. This work is performed by adjusting the amount of tightening of the screw for tightening the holding member to the support base.
In this operation, one of the guide members can be set to be parallel to the guide member on the main side. In addition, adjust the height position of the entire guide member with respect to the chassis,
It is also possible to adjust the inclination in the Y direction between the two guide members so that there is no inclination in the tangential direction between the rotation axis of the turntable and the optical axis.

Further, since the height position of the optical head with respect to the chassis can be adjusted, the distance between the disk installed on the turntable and the objective lens of the optical head can be set appropriately.

With the above adjustment, the parallelism between the pair of guide members can be set, and the inclination of the rotation axis and the optical axis of the head in the tangential direction can be eliminated. Also, if necessary,
The parallelism between the rotation axis and the optical axis of the head can be set with high accuracy by adjusting the rotation axis only when the rotation axis is tilted in the radial direction.

That is, in the present invention, the parallelism between the rotation axis and the optical axis is ensured only by adjusting the height of both ends of one guide member and adjusting the inclination of the rotation axis in the radial direction. Since the pair of guide members are parallel to each other, the rotation axis and the optical axis can be kept parallel no matter where the head moves.

Further, in the adjusting mechanism, since both ends of the guide member are completely held and fixed by the holding member, the guide member does not come off due to an external impact. Furthermore, by holding the holding member and the support base in a concave and convex manner so that the holding member slides only in the adjustment direction with respect to the support base, the holding member and the support base do not come off due to an external impact. Thus, even when a heavy head is used, the strength of the adjustment mechanism can be increased, and the durability is excellent.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a disk drive unit of an on-vehicle disk device according to the present invention, in which a mechanism chassis is shown with its rear surface facing upward. In the disk drive unit shown in FIG.
Are made of sheet metal, and a bracket B made of synthetic resin is fixed to the back surface of the mechanism chassis 16. The movable base 18 on which the optical head H is mounted is guided by a pair of guide members (guide shafts) 14 and 15. Both ends of one guide member (main shaft) 14 are fixed to supports B1 and B2 provided on the bracket B. Both ends of the other guide member 15 are held by holding members 21 and 22. The bracket B has a tracking motor 25,
A reduction gear train 26 and a feed screw shaft 27 are supported, and a female screw member 29 supported on the moving base 18 via a leaf spring 28 is screwed to the feed screw shaft 27. The spindle motor 11 is fixed to the adjustment pedestal 30 at one end in the X-axis direction in which the moving base 18 slides,
The rotating shaft 11a is located on the front side of the mechanism chassis 16 (Z in the figure).
The turntable 13 is fixed to the tip of the rotating shaft 11a so as to protrude in the axis (-) direction).

For example, a disk D such as a CD, a CD-ROM, and a DVD is loaded on a turntable 13, clamped, and driven to rotate by a spindle motor 11. Due to the rotational force of the feed screw shaft 27, the moving base 18 moves from the inner peripheral side to the outer peripheral side of the disk D. Then, from the objective lens L of the optical head H to the disk D
Is irradiated with laser light, and the reflected light is detected by the light receiving element in the optical head H, and the signal is read.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1 showing an example of the configuration of an adjusting device for adjusting the tilt of the motor rotation shaft 11a in the radial direction. The adjustment pedestal 30 for fixing the spindle motor 11 is integrally formed with a pressing portion 30a. A coil spring 32 is interposed between the pressing portion 30a and the mechanism chassis 16. Adjustment screw 31
Is inserted into the pressing portion 30a, and the coil spring 3
2 is screwed to the insertion mechanism chassis 16. The coil spring 32 is selected so that its free length is longer than the gap length h between the pressing portion 30a and the mechanism chassis 16, and the pressing portion 30a always applies the urging force from the coil spring 32 in the Z-axis (-) direction in the figure. is recieving. Therefore, when the adjusting screw 31 is tightened to bring the pressing portion 30a closer to the mechanism chassis 16, the rotating shaft 11a of the spindle motor 11 can be tilted in the illustrated α1 direction. When the adjustment screw 31 is rotated in the loosening direction from this state, the rotating shaft 11a can be tilted in the α2 direction by the urging force of the coil spring 32.

That is, by rotating the adjusting screw 31, the direction and amount of tilt of the rotating shaft 11a in the radial direction can be adjusted. In the present invention, a device for adjusting the inclination of the adjustment pedestal 30 that supports the spindle motor 11 is provided at only one position, and the adjustment member is only the adjustment screw 31. Therefore, the rotary shaft 11a can only adjust the tilt in the radial direction, and does not adjust the tilt in other directions.

FIG. 3 is an enlarged perspective view showing an example of the configuration of an adjusting device for adjusting the inclination of the rotation axis and the optical axis of the disk device in the tangential direction in the present invention, and FIG.
It is sectional drawing seen from the V direction. As shown in FIGS.
In this guide member adjusting device, both ends of one guide member 15 are securely held and fixed by holding members 21 and 22. Holding holes 21a and 22a are formed in the surfaces of the holding members 21 and 22 facing each other, and the end surfaces of the guide members are fitted into and fixed to the holding holes 21a and 22a without looseness. Holding members 21 and
2, a small hole 2 for screw insertion extending in the Z direction
1b, 22b and large holes 21c, 22c serving as guide holes
Are formed. The small holes 21b and 22b are
The upper holes 21c and 22c are open at the lower ends.

The mechanism chassis 16 has a pair of support bases 34,
34 are fixed. At the lower ends of the support bases 34, 34, caulking portions 34b, 34b are integrally formed to protrude.
It is swaged and fixed on the back side of. Holding member 21,
The large holes 21 c, 22 c serving as guide holes of 22 are slidably and slidably fitted to the cylindrical support bases 34, 34 without any gap, and the holding members 21, 22 are Z-shaped with respect to the support bases 34, 34. It is slidably guided in the direction.

In the vicinity of the support base 34 on the mechanism chassis 16, a leaf spring 23 as an urging member is attached by fixing means such as caulking. The leaf spring 23 is formed by pressing a thin metal leaf spring material.
Arm 23 bent upward (Z-axis (+) direction)
a, the tip of which is a support portion 23b. The support portion 23b is formed in an arc shape, and its radius of curvature is formed larger than the outer diameter of the support base 34.
Under pressure. Therefore, the leaf spring 23
The arm portion 23a exerts an elastic force in the Z (+) direction in the drawing around the bent root portion, and the holding members 21 and 22 externally inserted into the support table 34 are urged in the Z (+) direction. .

From above the holding members 21 and 22,
The adjusting screw 24 is inserted into the small holes 21b and 22b, and is screwed into the screw holes 34a formed in the support bases 34 and 34. By tightening the adjusting screw 24, the holding members 21 and 22 can be adjusted in the direction (Z-axis (−)) approaching the mechanism chassis 16. On the contrary, when the adjusting screw 24 is loosened, the holding member is biased by the leaf spring 23. 21 and 22 are lifted, and their positions can be adjusted in the illustrated Z-axis (+) direction.
Therefore, by the rotation of the adjusting screw 24, the holding members 21 and
2 can be moved up and down in the Z-axis direction.
Height can be adjusted. Further, the relative torsion between the guide member 14 (main shaft) and the guide member 15 can be adjusted so that the two guide members 14 and 15 can be opposed to each other in parallel, and the parallelism between the guide members 14 and 15 is maintained. In this state, it is possible to change only the height on the guide member 15 side. By adjusting the height of the guide member 15, it is possible to adjust the head moving surface including the guide member 15 in the tangential direction with the guide member 14 (main shaft) as a reference (center).

Note that laterally protruding portions 21d and 22d are integrally provided below the holding members 21 and 22, and a small cylindrical protruding portion 21 extending in the illustrated Z-axis (-) direction is provided on the bottom surface thereof.
e and 22e are integrally formed. Mechanism chassis 16
Has a small hole 16 through which the small protrusions 21e and 22e can be inserted.
b, 16b are formed. When the height adjustment of the holding members 21 and 22 with respect to the chassis 16 is performed,
e and 22e are located in the small holes 16b, 16b and move up and down,
The rotation of the holding members 21 and 22 around the hole 16a is prevented, and the state in which the holding holes 21a and 22a face each other can be maintained. Therefore, the guide member 15 can be kept parallel with high precision in the X-axis direction, and the occurrence of inclination in the XY plane can be prevented.

As shown in FIG. 3, irregularities having a constant pitch in the circumferential direction are formed on the outer peripheral surface of the screw head of the adjusting screw 24 used in the guide member adjusting device. Steps 21f and 22f are formed on the heads of the holding members 21 and 22 through which the adjusting screw 24 is inserted. An uneven surface facing the unevenness of the adjusting screw 24 is formed on the inner surfaces of the steps 21f and 22f. However, the convex portion on the adjusting screw 24 side and the convex portions on the steps 21f and 22f do not abut, and are formed so as to have a gap 21g between both convex portions (see FIG. 3). Therefore, after the height positions of the holding members 21 and 22 are set, the adjusting screw 24 can be securely fixed to the holding members 21 and 22 by injecting an adhesive into the gap 21g. Adjustment screws 24, 2
4 can be prevented from occurring.

Next, a method for adjusting the disk device will be described. In the example of the figure, since the guide member 14 which is the main side of the pair of guide members is fixed, only the guide member 15 side is adjusted with the guide member 14 as a reference. However, the same adjusting device as shown in FIG. 3 may be provided at both ends of the main-side guide member 14 to adjust the relative posture of the guide member 15 with respect to the mechanism chassis 16. In the embodiment shown in FIG.
The relative position of the guide member 15 with respect to the guide member 14 is adjusted by rotating the adjusting screws 24, 24 of the adjusting device provided at both ends of the guide member 15. That is, by individually rotating the adjustment screws 24 and 24, the inclination angle of the guide member 15 on the XZ plane and the height position adjustment in the Z direction are performed.

By adjusting the inclination angle of the guide member 15 in the XZ plane, the guide member 15 and the guide member 1 are adjusted.
4 are set parallel to each other, and while maintaining this parallelism, the entire guide member 15 is moved up and down in the Z direction to adjust the height with respect to the mechanism chassis 16 so that both central axes of the guide members 14 and 15 are aligned. The tilt adjustment in the tangential direction (Y direction) of the included plane (moving surface of the optical head H) can be performed. By this adjustment, it is possible to eliminate the relative inclination of the optical axis of the objective lens L of the optical head H, which is moved by the guide members 14 and 15 in the parallel state, with the rotation axis 11a in the tangential direction. Further, the adjusting screw 31 in the adjusting device shown in FIG. 2 is rotated to adjust the inclination of the rotating shaft 11a of the spindle motor 11 in the radial direction (X direction), and the distance between the rotating shaft 11a and the optical axis of the objective lens L is adjusted. The relative tilt in the radial direction is adjusted.

As described above, only two adjustment screws 24, 24 provided at both ends of the guide member 15 and one adjustment screw 31 shown in FIG. , The rotation axis 11a and the optical axis of the optical head H can be set parallel to both the radial direction and the tangential direction. Also, the guide members 14 and 15
Can be set in a parallel state, so that no matter where the moving base 18 and the optical head H move along the guide members 14 and 15, the relative rotation of the rotation axis 11a and the optical axis in the writing direction occurs. Therefore, the optical axis of the optical head H can be always perpendicular to the disk D, and a highly accurate reproduction operation or recording operation can be performed.

The guide member 15 has both end surfaces inserted into the holding holes 21a and 22a of the holding members 21 and 22 to be completely held. The holding member is elastically supported by the leaf spring 23. The holding member 2
Adjustment direction (Z direction) with respect to support tables 34, 34
The guide member 15 is supported so as to be slidable only, and does not relatively move in other directions. Therefore, even when a strong external impact is applied, both ends of the guide member 15 do not come off. In the above description, the support bases 34, 3
The leaf springs 23 are used to urge the cover 4 away from the mechanism chassis 16, but a coil spring may be used instead of the leaf spring.

[0034]

According to the present invention described in detail above, the parallelism of the pair of guide members for guiding the head can be adjusted with high accuracy, and the height position of the head with respect to the chassis can also be adjusted. Furthermore, if it is possible to adjust the inclination of the rotation axis in the radial direction, by providing a minimum adjustment point, the rotation axis and the optical axis can be maintained in a state parallel to both the radial direction and the tangential direction. It is possible to adjust.

Further, since both ends of the guide member can be securely held, the guide member is resistant to external impact.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an on-vehicle disk drive unit according to the present invention with its back surface facing upward;

2 is a cross-sectional view taken along the line II-II of FIG. 1, illustrating an example of the configuration of an adjustment device that adjusts the tilt of the rotation shaft in the radial direction;

FIG. 3 is an enlarged perspective view showing one configuration example of an adjusting device provided at both ends of a guide member.

FIG. 4 is a cross-sectional view as viewed from an IV direction in FIG. 3;

FIG. 5 is a partial side view showing a disk support of a conventional CD player.

FIG. 6 is a partial side view showing a state in which the rotation axis is inclined,

FIG. 7 is a side view showing a conventional adjusting device for adjusting the inclination of a rotating shaft;

FIG. 8 is a perspective view showing a conventional guide member support mechanism.

[Description of Signs] 11 Spindle motor (motor) 13 Turntable 14, 15 Guide member 16 Mechanism chassis 21, 22 Holding member 21a, 22a Holding hole 23 Leaf spring 24 Adjusting screw 30 Adjusting pedestal 31 Adjusting screw 32 Coil spring 34 Support

Claims (3)

[Claims] 1. A pair of guide members provided in parallel on a chassis at predetermined intervals and a read or write head supported at both ends by the guide members and moving along the guide members. In the disk device, both holding members holding both ends of at least one guide member are guided so as to be able to move up and down in a direction perpendicular to the moving direction of the head with respect to a support table fixed to the chassis side, and The holding member is urged in a direction away from the chassis side by an elastic member, and the holding member is screwed to the support base. By adjusting a tightening amount of the screw, the position of the holding member in the guide direction is adjusted. Is set in the disk device. 2. The adjusting device according to claim 1, wherein the holding member is fitted to the support table so as to be slidable only in the guide direction. 3. The adjusting device according to claim 1, wherein the rotation axis of the turntable on which the disk is installed is adjustable so as to be tilted only in the moving direction of the head.