JP2001101672A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately perform, with a simple constitution, the skew and the height adjustment of an optical pickup device in an optical disk device. SOLUTION: A spindle motor mechanism 43 for rotatably driving an optical disk is attached to a chassis 42 through an installation plate 49 in a manner that the height and the tilt are adjustable, and a feeding mechanism 45 and a guiding mechanism 46 for moving the optical pickup device 44 in the radial direction relative to the optical disk which is rotatably driven by the spindle motor mechanism 43 are attached to the chassis 42 so as to make the skew and the height separately adjustable. The skew and the height of the optical pickup device 44 are thereby made adjustable simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for recording and / or reproducing an optical disk which is a disk-shaped optical recording medium such as an optical disk and a magneto-optical disk.

[0002]

2. Description of the Related Art An optical pickup device provided in an optical disk device is provided alone in an optical disk device for reproducing an optical disk such as a compact disk (CD), and a magneto-optical device for recording and / or reproducing a magneto-optical disk. The disk device is provided in combination with a magnetic head device as an overwrite head.

As shown in FIG. 6, a magneto-optical disk device as an optical disk device has a recording / reproducing mechanism 3 comprising an optical pickup device 1 and a magnetic head device 2, and a disk rotating drive comprising a spindle motor 4 and a turntable 5. A mechanism 6 is provided.

The optical pickup device 1 incorporates an optical system (not shown) having a semiconductor laser for generating a laser beam as a light source and a light receiving signal element for receiving and detecting a disk reflected beam in a flat box-shaped slide base 7 as a main body. Then, the optical path of this optical system is conducted to the objective lens 8 side exposed on the surface side of the slide base 7. The objective lens 8 is movably supported in a focus direction and a tracking direction by a two-axis actuator 23 which is an objective lens driving mechanism shown in FIG. 7, and the two-axis actuator 23 is covered by an actuator cover 9. Window hole 9a corresponding to the objective lens 8
Is provided so that the objective lens 8 faces outward and emits a laser beam.

The magnetic head device 2 has a head for generating a magnetic field, that is, an overwrite head 10 mounted on a head slider 11, and the head slider 11 having a cantilever leaf spring 13 fixed to a support member 12 at a base end. It is configured to be attached to the tip.

[0006] side so as to face each other across the optical disk D _M to be placed chucked on the turntable 5 of the optical pickup device 1 and the magnetic head unit 2 the rotary drive mechanism 6 in the direction perpendicular to the disk surface They are connected by a bracket 14 formed in a substantially U-shape when viewed. In this connection, the optical pickup device 1 is fixed to the lower horizontal surface portion 14a of the bracket 14 at the base end of the slide base 7, and the magnetic head device 2 is mounted to the upper horizontal surface portion 14b at the base end of the support member 12. Constitute the recording / reproducing mechanism 3. The support member 12 includes a support plate 12a to which a cantilever support spring 13 is fixed, and a bracket 1
4 and a movable plate 12c whose tip is engaged with the lower side of the support plate 12a and is rotationally biased downward by a torsion spring 12b.

The recording / reproducing mechanism 3 includes a pair of guide shaft holes 15 provided on the base end side of the slide base 7 of the optical pickup device 1 and a substantially U-shaped guide provided near one side of the distal end side. The grooves 16 are respectively inserted and engaged with guide shafts 17 and 18 which are fixed to the chassis (not shown) on the side of the chassis.
That it is movably supported in the radial direction of the magneto-optical disk D _M that is chucked on the turntable 5. A screw receiver 19 is attached to the bracket 14 and is screwed to a rotary screw shaft 22 of a sliding motor 21 supported by a motor bracket 20 on the chassis side.

[0008] recording and reproducing mechanism 3 by the rotation of the rotating screw shaft 22 by the driving of the sliding motor 21 is moved in the radial direction with respect to the magneto-optical disk D _M on the turntable 5, this movement of the magnetic head device 2 overwrite head 10 is moved with a predetermined interval with respect to the disk surface by the head slider 11 against the load of the cantilevered leaf spring 13 floats from the disk surface of the magneto-optical disk D _M, the magneto-optical disk D _M Is recorded and reproduced.

[0009] The optical pickup device 1 provided in the optical magnetic disc apparatus as thus configured optical disk apparatus, on a recording surface of the magneto-optical disk D _M, formed in a spiral shape a substantially concentric In order to accurately record the recording signal along the recording track to be recorded, and to accurately read the recording data along the recording track,
Properly focused, i.e., the light beam is the beam spot is accurately positioned on the magneto-optical disc in focus on the recording surface of the D _M recording track of the light beam emitted from the semiconductor laser as a light source on the recording surface of the disk Therefore, it is necessary that the light beam be incident perpendicularly to the recording surface of the disk and be reflected.

[0010] The biaxial actuator 23 as shown in the objective lens 8 7 of this for the optical pickup device 1 is supported movably in the focus direction and the tracking direction with respect to the optical disk D _M. The biaxial actuator 23 supporting the objective lens 8 includes a focus coil 25 and a tracking coil 2 on a lens holder 24 as a movable member on which the objective lens 8 is held.
The bobbin 27 around which the bobbin 2 is wound is attached.
7 is inserted into a yoke 30 formed upright from a yoke base 28 as an actuator substrate and joined with a magnet 29 so as to be movable in the axial direction and rotatable in the axial direction. The lens holder 24 is fixed to a biaxial support 32 as a fixed side member fixed to a rear end of the yoke base 28 via an adjustment plate 31 at a diaphragm spring portion 33a at a base end in a vertical direction. And four spring wires 33 substantially parallel to the lateral direction, ie,
The biaxial suspension is movably supported in the vertical and horizontal directions, configured objective lens 8 to be held in this lens holder 24 is operated controlled in focusing and tracking directions with respect to the magneto-optical disk D _M Have been.

Further, the objective lens 8, the lateral and longitudinal directions in order to reflect by incident perpendicularly the light beams to the recording surface of the magneto-optical disk D _M displacement or skew (XY direction) (gradient) In order to adjust the skew of the objective lens 8, the biaxial support 32 supporting the lens holder 24 via the spring wire 33 is fixed to the yoke base 28 as an actuator substrate via the adjustment plate 31. Before using the required jig, and after adjusting the skew in the tangential direction,
By fixing the adjustment plate 31 to the yoke base 28 using the solder s, a two-axis actuator 23 as an objective lens driving mechanism is configured.

The optical pickup device 1 configured as described above is also used as an optical pickup device in an optical disk device for reproducing a read-only optical disk such as a compact disk (CD).

[0013]

As described above, in order to maximize the characteristics of the optical pickup device of the optical disk device and the optical pickup device of the magneto-optical disk device, it is necessary to reduce the skew of the optical pickup device. Need to be the best point. For this reason, the skew of the optical pickup device is adjusted on the chassis on which the optical pickup device is mounted. However, since the chassis itself is warped and deformed, the focus stroke, ie, the optical pickup device, is required in the skew adjustment of only the optical pickup device. Height may be insufficient.

As a countermeasure, it is necessary to perform skew adjustment and height adjustment of the optical pickup device. However, if a height adjustment mechanism is added to this skew adjustment mechanism, cost increase and space problems occur, so that this is realized. There is no sex.

Therefore, as a provisional measure, it is often introduced to take a large focus stroke before the adjustment of the optical pickup device. Nevertheless, an extreme design which is logically permissible is adopted, and the margin is limited. There was almost no state.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an optical disk device capable of simultaneously and reliably performing skew adjustment and height adjustment of an optical pickup device with a simple configuration.

[0017]

In order to achieve the above object, the present invention provides a rotary drive mechanism for rotating an optical disc, and a guide mechanism driven by a feed mechanism and a guide mechanism to drive a signal recording surface of the optical disc. An optical disc device comprising a chassis and an optical pickup device that is moved in a radial direction, wherein a rotation drive mechanism is arranged on the chassis so as to be adjustable in height, and a feed mechanism and a guide mechanism are separately skewed on the chassis. The optical pickup device is arranged so that the skew and height of the optical pickup device can be adjusted simultaneously.

In the above construction, the feed mechanism supports the feed screw shaft, which is screwed into the support substrate on one side of the base of the optical pickup device and serves also as a main guide shaft and a drive shaft, and is provided with the feed mechanism. A drive mechanism for rotating and driving the screw shaft is mounted, and the guide mechanism is configured by providing a sub guide shaft slidably supporting the other side of the base of the optical pickup device on the mounting body, and a feed mechanism. The supporting substrate and the mounting body of the guide mechanism are mounted on the chassis via a fixing member so as to adjust the skew and height.

Further, in the above construction, a screw hole is provided on one of the mutually facing surfaces of the support member of the feed mechanism and the mounting member of the guide mechanism and the fixing member on the chassis side, and a through hole having a diameter larger than the screw hole is provided on the other. And a fastening screw is screwed into the screw hole from the through-hole side to temporarily fix the support substrate and the mounting body to the fixing member so that the skew and the height can be adjusted.

In the optical disk device of the present invention thus configured, the height of the rotation drive mechanism of the optical disk can be independently adjusted with respect to the chassis, and the feed mechanism and the guide mechanism of the optical pickup device can be moved relative to the chassis. The skew and height can be adjusted so that the skew and height of the optical pickup device can be simultaneously adjusted on the chassis.

In the optical disk device thus configured, the adjusting means for adjusting the skew and the height of the optical pickup device can be easily configured with a small number of components, and can be used for a warped or deformed chassis. Also, the skew and height of the optical pickup device can be reliably adjusted, and the translation operation is always performed accurately with respect to the signal recording surface of the optical disk that is rotationally driven by the rotational drive mechanism, thereby ensuring recording and / or reproduction. Can be done. Further, the skewing of the optical pickup device and the simplification of the configuration of the height adjusting means enable a reduction in cost and a reduction in the size of the optical disk device.

[0022]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

In this embodiment, the optical pickup device is configured so as to be able to guide and move in parallel at a predetermined height with respect to a signal recording surface of an optical disk which is rotationally driven by a rotational driving mechanism.

FIG. 1 is a plan view of an example of an optical disk device. This optical disk device 41 includes a chassis 42, a spindle motor mechanism 43 as a rotation drive mechanism of an optical disk D, and an optical pickup device 44. Feed mechanism 45 and guide mechanism 46 of optical pickup device 44
It is composed of

The spindle motor mechanism 43 includes a spindle motor 47, a turntable 48, and a mounting plate 49. The spindle motor 47 is fixed to the lower surface of the mounting plate 49, and the motor shaft of the spindle motor 47 is The turntable 48 is fixed to the distal end of the motor shaft 47a by projecting 47a to the upper surface side of the mounting plate 49. The spindle motor mechanism 43 is disposed at a predetermined position of the chassis 42 by screwing the mounting plate 49 with a set screw 50 so that the height can be adjusted.

In this embodiment, the optical pickup device 44 is a twin-type pickup device for a CD-ROM and a DVD. A first and a second base are provided on a slide base 51 as a base. Objective lenses 52 and 5
Each of the slide bases 51 is provided with a main guide bearing 54 on one side of the slide base 51. The auxiliary guide portion 55 is provided on the other side.

The feed mechanism 45 of the optical pickup device 44 has a feed screw shaft 61 which is screwed into the main guide bearing portion 54 of the optical pickup device 44 and serves as a main guide shaft and a drive shaft inside the support substrate 60. A sliding motor 62 for rotating and driving a feed screw shaft 61 is mounted on the lower surface side, and a reduction gear mechanism 63 for transmitting the driving force of the sliding motor 62 to the feed screw shaft 61 is provided by a feed screw. It is provided between one end of the shaft 61 and a motor shaft 62 a of the sliding motor 62.

In the guide mechanism 46 of the optical pickup device 44, a sub-guide shaft 65 with which the sub-guide portion 56 of the optical pickup device 44 is slidably engaged is integrally provided inside the mounting body 64. It is composed.

The spindle motor mechanism 43, the optical pickup device 44, the feed mechanism 45, and the guide mechanism 46 configured as described above are separately assembled.

Then, the spindle motor mechanism 43 is attached to the chassis 42 as described above, and the feed mechanism 45 and the guide mechanism 46 are attached to the chassis 42, and the spindle motor mechanism 4
No. 3 is installed so as to face in parallel to the inside of both sides of the opening 42a formed to face the attachment site.

In this embodiment, the feed mechanism 45
A mounting edge surface portion 60a is formed upright on an outer portion of the support substrate 60, and screw holes 66 are formed at both ends of the mounting edge surface portion 60a.
Are formed, and screw holes 67 are formed at both ends on the outer surface side of the mounting body 64 of the guide mechanism 46.

On the other hand, a feed mechanism 45 is provided on the chassis 42 side.
A fixing frame 70 having a substantially L-shaped cross section corresponding to the mounting edge 60a of the support substrate 60 is fixed to the outside of the mounting portion, and is supported on both ends of the vertical surface 70a of the fixing frame 70. This screw hole 66 corresponds to the screw hole 66 on the substrate 60 side.
A larger diameter through hole 71 is provided. Further, on the chassis 42 side, a support plate 72 located outside the mounting portion of the guide mechanism 46 and corresponding to the outer surface side of the mounting body 64 is fixed in a rising shape. Corresponding to the screw hole 67 on the body 64 side, a through hole 73 having a larger diameter than the screw hole 67 is formed.

As described above, each mechanism of the optical disk device 41, that is, the chassis 42, the spindle motor mechanism 43, the optical pickup device 44, the feed mechanism 45, and the guide mechanism 46 are separately assembled. After this assembly, a spindle motor 47 provided with a turntable 48 of the spindle motor mechanism 43 at a predetermined portion of the chassis 42, that is, at a front end side of the opening 42a, is temporarily fixed with a set screw 50 via a mounting plate 49.

The optical pickup device 44 temporarily fixes the feed mechanism 45 to the chassis 42 in a state where the feed mechanism 45 and the feed screw shaft 61 are screwed and connected to the main guide bearing portion 54. The provisional fixing of the feed mechanism 45 to the chassis 42 is performed by disposing the support substrate 60 on one side of the opening 42 a which is a predetermined portion of the chassis 42, and attaching the mounting edge 60 a of the support substrate 60 to the fixed frame body on the chassis 42 side. 70 upper surface part 70
a from the inner surface side to make the screw hole 66 and the through hole 71 conductive, and the tightening screw 74 is inserted from the through hole 71 side into the screw hole 66.
To temporarily fix the support substrate 60.

In this state, the sub-guide shaft 65 of the guide mechanism 46 is engaged with the sub-guide portion 55 on the optical pickup device 44 side, and the guide mechanism 46 is temporarily fixed to the chassis 42. To temporarily fix the guide mechanism 46 to the chassis 42, the mounting body 64 is disposed on the other side of the opening 42 a which is a predetermined portion of the chassis 42, and the support plate 72 of the chassis 42 is provided with the engagement grooves 64 a at both ends on the outer surface side. In this case, the screw hole 67 is inserted into the screw hole 6 from the side of the screw hole 6 so that the screw hole 67 and the through hole 73 are electrically connected to each other.
7, and the mounting body 64 is temporarily fixed.

Thus, the spindle motor mechanism 43, the optical pickup device 44, the feed mechanism 4
5 and the guide mechanism 46 are temporarily fixed and set on an adjustment jig (not shown). Then, the optical disk D is placed on the turntable 48 of the spindle motor mechanism 43, chucked, and rotated. In this state, the optical pickup device 44 is operated to move the objective lens 5.
Laser light is emitted from 2 or 53 to the recording surface of the optical disk D, and servo is applied in the order of focus servo and tracking servo to output an RF signal.

Jitter is read from the RF signal, and the skew of the optical pickup device 44 is adjusted in two directions, a tangential direction and a radial direction, so that the jitter is optimized.

Of the two directions of adjustment, the adjustment in the tangential direction is performed by moving the guide shaft up and down, that is, by tightening the tightening screw 74 with the support substrate 60 on the feed mechanism 45 side to the fixed frame 70 on the chassis 42 side. The vertical position is adjusted in a loosened state, and the mounting body 64 on the guide mechanism 46 side is vertically adjusted in a state in which the tightening screw 75 is loosened with respect to the support plate 72 on the chassis 42 side.
And the inclination of the sub guide shaft 65 is adjusted.
The skew of the optical pickup device 44 in the tangential direction can be adjusted by adjusting the inclination of only the sub guide shaft 65 on the guide mechanism 46 side.

In the adjustment of the skew of the optical pickup device 44 in the tangential direction, the straightness of the guide shaft is a problem. There are the following two solutions to this problem. 1. The adjustment is performed by setting the adjustment jig with high accuracy in advance. 2. The optical pickup device 44 is sent to the outer periphery in a state where the inner periphery of the guide shaft is adjusted to the best point on the inner periphery, that is, the spindle motor mechanism 43 side, and the outer periphery of the guide shaft is adjusted again to reduce the jitter. Match the best points.

When the first method and the second method are compared as a solution, the second method is extremely good in quality, but requires a long working time and is costly.

The adjustment in the radial direction is performed by tilting the optical pickup device 44 in the radial direction. That is, the radial adjustment of the optical pickup device 44 is performed by the operation of tilting the support substrate 60 on the feed mechanism 45 side in the radial direction with the fastening screw 74 loosened with respect to the fixed frame body 70 on the chassis 42 side.

Thus, the optical pickup device 4
After adjusting the skew of No. 4, the focus drive signal of the two-axis actuator is output, and the spindle motor mechanism 43 is mounted on the chassis via the mounting plate 49 so that the focus drive signal becomes “0 V” or the voltage of the design center. Move up and down with respect to 42 to adjust the height.

By the above operation, on the chassis 42, the optical pickup device 44 can adjust the height to the design center at the best skew.

After the skew and height of the optical pickup device 44 have been adjusted as described above, the support substrate 60 on the feed mechanism 45 side and the mounting body 64 on the guide mechanism 46 side are fixed to the fixed frame 70 on the chassis 42 side. And the support plate 72. This fixing is carried out by tightening screws 74 respectively.
And 75 are performed by tightening, but can be performed by bonding or the like using an adhesive.

In the optical disk device 41 of this embodiment configured as described above, the skew and height adjustment of the optical pickup device 44 can be easily and reliably performed on the chassis 42 at the same time. Even if warpage or deformation occurs, the optical axis of the objective lens of the optical pickup device 44 can be made to correspond perpendicularly to the signal recording surface of the optical disk that is rotationally driven by the rotational drive mechanism 43. , Recording and / or reproduction can be performed accurately.

In the above configuration, the support substrate 60 of the feed mechanism 45 of the optical pickup device 44 and the mounting body 64 of the guide mechanism 46 are integrally formed in a frame shape to form the chassis 42.
Skew and height adjustment can be performed on the spindle motor mechanism 43 side.

In this case, a set screw 50 for mounting the mounting plate 49 on the spindle motor mechanism 43 side to the chassis 42 side.
Adjust the tightening of the chassis 4 of the spindle motor 47
Adjust the tilt and height relative to 2.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment,
Various changes can be made without departing from the spirit of the present invention.

For example, although a twin type pickup device is used as the optical pickup device 44, the present invention is not limited to this type, and an optical pickup device having one objective lens can be used.

Further, the shape, size and the like of each member such as the chassis 42 can be arbitrarily changed.

[0051]

As described above, in the optical disk device according to the present invention, the skew movement of the optical pickup device can be separated without interference between the tangential direction and the radial direction. The adjustment accuracy can be improved.

Further, since there is no fulcrum in the height adjustment of the optical disk rotation drive mechanism and the optical pickup device, the height of both can be easily adjusted and can be adjusted with the minimum necessary height. Becomes possible.

Also, the skew adjustment mechanism of the optical pickup device is adjusted by an external adjustment jig without being incorporated into the components.
After adjustment, it will be fixed, so it will be the minimum necessary component configuration,
The cost can be reduced.

According to the present invention, the skew and height of the optical pickup device can be reliably adjusted, so that the recording and / or reproduction of the optical disk can always be performed accurately, and the reliability is improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of an optical disk device according to the present invention.

FIG. 2 is a right side view of the optical disc device shown in FIG.

FIG. 3 is a sectional view taken along line AA in FIG.

FIG. 4 is an enlarged sectional view of a part of the optical disk device shown in FIG. 1 on a feed mechanism side.

FIG. 5 is an enlarged sectional view of a part of the optical disk device shown in FIG. 1 on a guide mechanism side.

FIG. 6 is a perspective view of a conventional magneto-optical disk device in a partially separated state.

FIG. 7 is a plan view of a conventional two-axis actuator of an objective lens.

[Explanation of symbols]

41 ° optical disk drive, 42 ° chassis, 42a
{Aperture, 43} Spindle motor mechanism, 44} Optical pickup device, 45} Feed mechanism, 46 # Guide mechanism, 47 # Spindle motor, 48 # Turntable, 49 # Mounting plate, 50 # {Set screw, 51}
Slide base, 52, 53 ‥‥ Objective lens, 54 ‥‥
Main guide bearing, 55 ° sub guide, 60 ° support board, 61 ° feed screw shaft, 64 ° mounting body, 65 ° sub guide shaft, 70, 72 ° fixed body, 71, 73 ° ‥ Tightening screw, D ‥‥ Optical disc

Claims (3)

[Claims] A chassis is provided with a rotation drive mechanism for rotating and driving an optical disk, and an optical pickup device guided and driven by a feed mechanism and a guide mechanism and moved in a radial direction with respect to a signal recording surface of the optical disk. An optical disc device comprising: the rotation drive mechanism disposed on the chassis so as to be adjustable in height; and the feed mechanism and the guide mechanism are separately disposed on the chassis so as to be capable of skew and height adjustment. An optical disc device, wherein a skew and a height of the optical pickup device can be simultaneously adjusted. 2. The optical disk device according to claim 1, wherein the feed mechanism is screwed into a support substrate on one side of a base of the optical pickup device and serves as a main guide shaft and a drive shaft. A drive mechanism for supporting the screw shaft and rotating the feed screw shaft is mounted, and the guide mechanism slidably supports the other side of the base of the optical pickup device on the mounting body. An optical disc comprising a sub-guide shaft, wherein the support substrate of the feed mechanism and the mounting body of the guide mechanism are respectively mounted on the chassis via a fixing member so as to be adjustable in skew and height. apparatus. 3. The optical disk device according to claim 2, wherein a screw is provided on one of surfaces of the support substrate of the feed mechanism, the mounting body of the guide mechanism, and the fixing member on the chassis side facing each other. A hole having a diameter larger than that of the screw hole is formed on the other side, and a tightening screw is screwed into the screw hole from the side of the hole to skew the support substrate and the mounting member with respect to the fixing member. An optical disk device characterized in that it is temporarily fixed so as to be adjustable.