JPH09297928A - Recording medium reproducing or recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the device capable of obtaining a satisfactory attenuation effect against a vibration generated in a simple manufacturing process and a useless vibration. SOLUTION: An elastic wire 6a is equipped with a flat section 26 in a part in the vicinity of one end part in the longitudinal direction and toward the other end part in the longitudinal direction. A recessed part 18 provided in a base body 3 is constituted to surround the flat section 26. This recessed part 16 is filled with a damper material in a gel state. Consequently, a vibration of a moving body is attenuated by viscous resistance from the gel state damper material 29 against a flat part 26a of the flat section 26 of the elastic wire 6a and pressure from the damper material 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reproducing or recording recorded contents on an optical recording medium such as an optical disk and a magneto-optical disk.

[0002]

2. Description of the Related Art Conventionally, a CD (compact disc)
Optical disc playback device and MD (mini disc)
An optical pickup actuator as shown in FIG. 1 is used in a reproducing and recording device for a magneto-optical disk such as the above. FIG. 1 is a plan view showing an embodiment of the present invention, and a conventional technique will be described together. The optical pickup actuator 1a includes a base 2, a base 3, a wiring board 4, a moving body 5, and an elastic wire 6. In the prior art,
An elastic wire 6 is used instead of the elastic wire 6a of the optical pickup actuator 1a shown in FIG. The base body 3 is provided upright on one end of the base 2. A movable body 5 is provided on one side of the base body 3 so as to extend to the base 2 via an elastic wire 6. A wiring board 4 is provided on the other side of the base 3.

FIG. 5 is a schematic view showing a conventional elastic wire 6. The elastic wire 6 is a single shape of a round bar or a square bar having a predetermined length, has a bracket portion 30 at one end in the longitudinal direction, and the bracket portions 30 of the four elastic wires 6 are the same as those of the moving body 5. Mounted on the flange. The other end of the elastic wire 6 in the longitudinal direction is inserted into the recess 18 of the base body 3 and fixed as a fixed end to the wiring board 4 with solder 9 to be electrically connected. As a result, the moving body 5 is supported in a state of floating from the base 2. Further, the recess 18 of the base 3 is filled with a gel damper material 31. The elastic wire 6a is used as a lead wire, and a signal for driving the optical pickup actuator 1, for example, and exciting power for driving the focus coil 20a and the tracking coil 21a are applied to the moving body 5 from the wiring board 4.

The optical pickup actuator 1a has a C
Guided by two guide rails 11 and 12 arranged parallel to the radial direction of D10 so as to face the recording surface of CD10, it is moved radially outward from the rotation axis of CD10 by a feeding device (not shown). . The CD 10 is rotationally driven by a spindle motor (not shown). The optical pickup actuator 1a optically reads information recorded on the recording surface of the CD 10.

The movable body 5 is provided with an objective lens 7 for condensing the light emitted from a light emitting element (not shown) on the recording surface of the rotating CD 10. The light emitting element may emit semiconductor laser light, for example. The objective lens 7 focuses light on the recording surface of the CD 10 which is rotationally driven. The reflected light from the CD 10 passes through the objective lens 7, and the information recorded on the CD 10 is read by a light receiving element (not shown).

In addition, the moving body 5 and the base 2 are arranged in the x direction which is a direction perpendicular to the information recording surface of the CD 10.
A focus coil 20a and a magnet 20b for controlling the are provided. Further, the moving body 5 and the base 2 are provided with a pair of tracking coils 2 for controlling the moving body 5 in the y direction.
1a and magnet 21b are provided. The focus coil 20a and the tracking coil 21a control the moving body 5 so that the objective lens 7 of the moving body 5 can follow the track of the surface of the CD 10 regardless of eccentricity of the surface of the semiconductor laser light emitted by the irradiating semiconductor laser light.

By these controls, the moving body 5 is moved in the x-direction and the y-direction, and vibrations such as yawing, pitching and rolling which are angularly displaced about axes parallel to the x-direction, the y-direction and the z-direction are moved. It occurs in the body. This vibration causes the damper material 29 filled in the recess 18 provided in the base body 3 near the other longitudinal ends of the four elastic wires 6.
And the portions of the four elastic wires 6 through which the damper material 29 is inserted are damped.

[0008]

The elastic wire 6 of the prior art for damping the vibration of the moving body 5 has a single round bar or square bar shape. As a result, the surface area of the elastic wire 6 that contacts the damper material 29 is small, and the damping effect on the vibration of the moving body 5 is small. Therefore, the time required for the vibration to be attenuated and converged becomes long, and the CD1 that is rotationally driven is rotated.
When reading information from 0 at high speed, there is a problem that information cannot be read accurately. Further, if the base body 3 is extended in the longitudinal direction of the elastic wire 6 in order to increase the damping effect, the spring constant of the elastic wire 6 becomes larger than the designed value, but there is a problem that it is difficult to design due to dimensional restrictions.

Further, when the support member is a round bar, it is difficult to simplify the integral molding or the adhesion when fixing it to the mounting flange portion of the moving body, and the manufacturing process becomes complicated.
There is a problem that it takes time and effort.

An object of the present invention is to provide a reproducing or recording apparatus for a recording medium which can be manufactured by a simple manufacturing process and which can obtain a satisfactory damping effect against the generated vibration.

[0011]

An object of the present invention is to face a disk-shaped recording medium which is rotationally driven, and an objective lens for reproducing or recording the recording medium, and a movable body for supporting the objective lens. A free end portion is attached to the moving body and has a resilient supporting member extending in a direction substantially perpendicular to the radial direction of the recording medium, a base body to which the base end portion of the supporting member is fixed, a base body and a moving body. And an objective lens, which is provided in association with a tracking drive unit that drives the objective lens in the radial direction of the recording medium using an electromagnetic force along the track of the recording medium, and the base body and the moving body. A focus drive unit that uses electromagnetic force in the vertical direction of the recording medium so as to maintain a constant distance with respect to the recording medium;
In a reproducing or recording apparatus for a recording medium, which comprises a substrate driving means that is driven in a radial direction for reproducing or recording the recording medium, the base has a free end near a base end fixed to the base of the supporting member. A recess is formed in a portion surrounding a portion close to the portion, and the portion of the supporting member is formed flat along the approaching / separating direction of the recording medium. Inside the recess, a gel-like material for damping vibration is formed. The recording medium reproducing or recording device is characterized by being filled with the damper material. According to the present invention, when the reproduction is performed on the disc-shaped recording medium, the moving body moves the information of the recording medium, for example, toward the outer side in the radial direction from the rotation axis of the disc-shaped recording medium by the substrate driving means. It is moved to the recording surface. The objective lens provided on the moving body focuses, for example, a semiconductor laser beam on the recording medium, and reads and reproduces information recorded on the recording medium based on the reflected light from the recording medium. Further, based on the read information, the moving body provided with the objective lens is servo-controlled by the tracking drive means and the focus drive means, so that the objective lens keeps a certain distance from the recording medium and follows the track of the recording medium. Controlled by. When the moving body is servo-controlled by the tracking driving means and the focus driving means, vibration is generated in the moving body. This vibration is damped by the portion surrounded by the recess provided in the base of the support member and the highly viscous gel-like damper material filled in the recess. The portion of the support member surrounded by the recess is formed flat in the approaching and separating direction of the recording medium, and has a surface area larger than the surface area of the portion of the support member that is not formed flat.
Therefore, the surface of the flatly formed portion of the support member is
Since the area of the conventional support member surrounded by the recess is larger than that of the surface, the support member of the present invention has a greater vibration damping effect than the conventional support member. Since the damping effect is further increased, the time taken to damp the vibration of the moving body and the unnecessary vibration and stop the vibration is shortened.

Further, in the supporting member of the present invention, the free end portion of the supporting member is fixed to the inside of the recording medium in the radial direction on the moving body, and the cross-sectional shape perpendicular to the axis of the supporting member is quadrangular. It is characterized by Further, according to the invention, the sectional shape of the support member at right angles to the axis is formed into a quadrangle by etching or the like. Further, a portion of the support member that is fixed to the moving body, for example, a bracket portion is integrally molded, and the supporting member fixes the moving body on the inner side and the outer side in the radial direction of the recording medium, that is, fixes the moving body on both sides. Therefore, if the support member is a round bar, it is difficult to integrally mold the portion attached to the moving body, but the portion of the support member fixed to the moving body can be integrally formed by etching or the like. Can be simplified.

Further, the above-mentioned portion of the supporting member of the present invention is characterized in that the supporting member is flattened by etching or partially pressing. Further, according to the invention, the portion of the support member surrounded by the recess provided in the base, that is, the portion in contact with the damper member,
The flat portion can be formed by a simple manufacturing process by pressing or etching.

Further, it is characterized in that an attenuation rate adjusting hole having an axis parallel to the radial direction of the recording medium is formed in the portion of the supporting member of the present invention. Further, according to the invention, the portion of the support member surrounded by the recess provided in the base is formed flat, and the flattened portion is provided with the damping ratio adjusting hole having an axis parallel to the radial direction of the recording medium. To be By providing the damping ratio adjusting hole in the flat portion, the vibration of the recording medium acting on the moving body in the approaching / separating direction causes the viscous resistance from the damper material to the plane parallel to the approaching / separating direction and the damping ratio adjusting hole. The circumferential surface is damped by the shearing force applied to the gel-like damper material that has flowed into the damping ratio adjusting hole, and the damping effect on the vibration of the recording medium in the approaching / separating direction is increased. On the other hand, the vibration acting on the moving body in the direction perpendicular to the approaching / separating direction of the recording medium is caused by the pressure from the damper material against the flat surface parallel to the approaching / separating direction of the recording medium and the inner circumference of the damping ratio adjusting hole. It is damped by the viscous resistance from the gel-like damper material that has flowed into the damping ratio adjusting hole formed on the surface, and the damping effect on the vibration in the direction perpendicular to the approaching / separating direction of the recording medium becomes small. Therefore, when the damping ratio adjusting hole is not provided, the damping ratio for the vibration of the recording medium in the approaching / separating direction may differ from the damping ratio for the vibration of the recording medium in the vertical direction in the approaching / separating direction. By providing the adjustment hole, it is possible to easily adjust the damping ratios in the respective directions to be substantially equal. Further, since the damping ratio for the vibration of the recording medium in the approaching / separating direction and the damping ratio for the vibration of the recording medium in the vertical direction of the approaching / separating direction are almost equal, focus drive for controlling the moving body in the approaching / separating direction of the recording medium is performed. It is possible to easily set the excitation current flowing in the means and the tracking drive means for controlling the moving body in the direction perpendicular to the approaching / separating direction of the recording medium.

Further, the above-mentioned portion of the supporting member of the present invention has a rising portion in a direction approaching the recording medium or a direction separating from the recording medium, and an extending portion continuing to the tip of the rising portion and extending in the vertical direction in the radial direction of the recording medium. It is characterized by having. Further, according to the invention, the portion of the supporting member surrounded by the recess provided in the base is continuous with the rising portion in the direction approaching the recording medium or in the direction separating from the recording medium, and is continuous with the leading end of the rising portion in the radial direction of the recording medium. And an extension extending in the vertical direction. When the moving body is moved under the servo control by the tracking drive means and the focus drive means,
Vibrations such as rolling that is angularly displaced about the axis of the support member longitudinal direction, pitching that is angularly displaced about an axis parallel to the radial direction of the recording medium, or yawing that is angularly displaced about an axis parallel to the approaching / separating direction of the recording medium. Occurs.
In the recess, when the support member tries to rotate about the above-mentioned axis, the extension provided on the support member requires a large rotational moment about the axis with respect to the gel damper material. As a result, the vibration that tends to rotate around the above-mentioned axis is damped. Therefore, since the rising portion and the extending portion are provided in the portion of the support member surrounded by the recess provided in the base body, the axis line of the support member in the longitudinal direction of the moving body, the axis line parallel to the radial direction of the recording medium, or It is possible to increase the damping effect on vibrations that are angularly displaced about the axis parallel to the approaching / separating direction of the recording medium.

[0016]

1 is a perspective view of an optical pickup actuator 1a according to an embodiment of the present invention. The optical pickup actuator 1a is a device that optically takes in information recorded on a CD 10 which is a rotationally driven disc-shaped recording medium. The optical pickup actuator 1a includes a base 2, a base 3, a wiring board 4, a moving body 5, and an elastic wire 6a. The base body 3 is provided upright on one end of the base 2. The movable body 5 is provided on one side of the base 3 so as to extend to the base 2 via four elastic wires 6 a. A wiring board 4 is provided on the other side of the base 3. A bracket portion 25 is formed at one longitudinal end of each of the four elastic wires 6a, and the bracket portion 25 is attached to the attachment flange portion 17 of the moving body 5. The vicinity of the other longitudinal ends of the four elastic wires 6 a is inserted into the recess 18 provided in the base body 3, and the other longitudinal ends of the elastic wires 6 a are fixed to the wiring board 4.
As a result, the moving body 5 is supported by the four elastic wires 6a in a state of floating from the base 2.

Below the base 2, two parallel guide rails 11 and 12 are formed so as to face the information recording surface of the CD 10 in the y-axis direction which is the radial direction from the rotation axis of the CD 10. . The optical pickup actuator 1a is a CD 1 that is rotationally driven by a base body drive device (not shown).
It is moved along the guide rails 11 and 12 from the rotation axis of 0 to the bottom of the track portion where information is recorded outward. Moved optical pickup actuator 1a
Reads the information recorded on the surface of the CD 10.

The moving body 5 of the optical pickup actuator 1a has an objective lens 7 through which irradiation light and reflected light pass.
Is provided. The light emitting element may emit semiconductor laser light, for example. The objective lens 7 has an optical axis of light emitted from the light emitting element and an optical axis of light incident on the light receiving element.
The light emitting element and the light receiving element are provided so as to coincide with each other. The light condensed by the objective lens 7 is along the optical axis 15,
The CD 10 which is rotationally driven is irradiated. The reflected light from the CD 10 is incident on the objective lens 7 along the optical axis 15, and the information recorded on the surface of the CD 10 is optically read.

The optical pickup actuator 1a has a C
At the same time that the information is read from D10, the focus and tracking control information is also read. The optical pickup actuator 1a servo-controls the moving body 5 including the objective lens 7 based on the control information.

The moving body 5 and the base 2 are provided with a focus coil 20a for controlling the moving body 5 and a magnet 20b in the x direction which is a direction perpendicular to the information recording surface of the CD 10. The focus coil 20a is provided on the moving body 5 so as to have an axis line parallel to the x-axis direction. Further, the moving body 5 and the base 2 are provided with a tracking coil 21a for controlling the moving body 5 in the y direction and a magnet 21b. The tracking coil 21a is provided on the moving body 5.

The optical pickup actuator 1a has a C
Based on the focus control information read from D10, the focus coil 20a is connected to the elastic board 6 from the wiring board 4.
Excitation power is applied through a to generate an electromagnetic force to perform focus control in the x direction. Further, the optical pickup actuator 1a applies exciting power to the tracking coil 21a from the wiring board 4 through the elastic wire 6a based on the tracking control information read from the CD 10,
An electromagnetic force is generated to perform tracking control in the y direction. As a result, the optical pickup actuator 1
The light spot focused by the objective lens 7 a is made to follow the surface track of the CD 10 and follow the track on the surface of the CD 10 regardless of eccentricity.

When the optical pickup actuator 1a reads out the information recorded on the rotationally driven CD 10,
Focus coil 20a and tracking coil 21
The moving body 5 is moved in the x direction and the y direction against the elastic force of the elastic wire 6a by the electromagnetic force of a. At this time, unnecessary vibrations such as yawing, pitching, or rolling that are angularly displaced around axes parallel to the x direction, the y direction, or the z direction, which is the longitudinal direction of the elastic wire 6a, are generated in the moving body 5. This unnecessary vibration is caused by the damper material 29 filled in the recess 18 provided in the base body 3 near the other end portion in the longitudinal direction of the elastic wire 6a and the elastic wire 6a.
It is attenuated by the portion of the a through which the damper material 29 is inserted.

FIG. 2 shows an elastic wire 6 according to this embodiment.
It is a figure for explaining a. Elastic wire 6a
Includes a bracket portion 25 at one longitudinal end, and a flat portion 26 at a portion near the other longitudinal end near the one longitudinal end.
Is provided. The elastic wire 6a is formed by etching a single plate made of beryllium bronze or phosphor bronze,
The cross-sectional shape is processed into a quadrangle having a width T of 0.1 mm as one side, and the bracket portion 25 and the flat portion 26 described above are processed.
Also, the flat surfaces 26a on both sides in the thickness direction are processed so as to be integrally formed. Preferably, the cross-sectional shape perpendicular to the axis may be made into a rectangle such as a square by pressing or forging. In addition, the flat portion 26 of the elastic wire 6a
By placing a portion of the processed elastic wire 6a near the other end in the longitudinal direction near one end on a lower mold having a predetermined mold, and pressurizing the ram having the upper mold from above. You may form.

Bracket portion 25 of four elastic wires 6a
Are attached to the flange portion 17 of the moving body 5, respectively. The four elastic wires 6a are inserted through the recesses 18 provided in the base body 3, and the other end in the longitudinal direction is the base body 3 of the wiring board 4.
Is fixed to the side surface not provided with solder 28. Further, the elastic wire 6a is used as a lead wire, and a signal for driving the optical pickup actuator 1a, for example, and exciting power for driving the focus coil 20a and the tracking coil 21a are supplied from the wiring board 4 via the elastic wire 6a. It is given to the mobile unit 5.

The recess 18 provided in the base 3 is formed so as to surround the flat portion of the elastic wire 6a described above. As shown in FIG. 2C, the recess 18 is filled with a gel-like damper material 29 which is a highly viscous urethane acrylate damper material or silicon damper material.

The vibration of the moving body 5 is damped by viscous resistance from the gel damper material 29 to the flat surface 26a of the flat portion 26 of the elastic wire 6a and pressure from the gel damper material 29. In this case, the larger the area of the surface in contact with the damper material 29, that is, the larger the area of the flat surface 26a, the greater the damping effect. Therefore, since the flat portion 26 is provided on the elastic wire 6a and the area of contact with the gel-like damper material 29 is larger than that of the elastic wire 6 of the conventional technique, the damping effect can be improved. Further, by improving the damping effect, it is possible to reduce the time required for the generated vibration to damp and stop.

FIG. 3 is a view for explaining an elastic wire 6b which is another embodiment. In another embodiment, the optical pickup actuator 1 shown in FIG.
An elastic wire 6b is used instead of the elastic wire 6a of a. Since the structure is similar to that of the elastic wire 6a shown in FIG. 2, the same structure may be designated by the same reference numeral and the description thereof may be omitted.

In the elastic wire 6a according to the embodiment, the flat portion 26 is provided near the other end portion in the longitudinal direction to improve the damping effect on the vibrations in the x and y directions. On the other hand, the elastic wire 6b according to the other embodiment is
In order to adjust the difference between the damping ratio for vibration in the x direction and the damping ratio for vibration in the y direction, two adjustment holes 37, 38 are provided in the flat portion 36 near the other end in the longitudinal direction.

The elastic wire 6b has a bracket portion 25 at one longitudinal end and a flat portion 36 near the other longitudinal end near the one longitudinal end. Elastic wire 6
In b, a single plate made of beryllium bronze or phosphor bronze is processed into a quadrangle having a width T of 0.1 mm as one side by etching or the like, and the bracket portion 25 and the flat portion 36 described above are also processed. It is processed so as to be integrally formed. Preferably, the cross-sectional shape perpendicular to the axis may be made into a rectangle such as a square by pressing or forging. The flat portion 36 of the elastic wire 6a
By placing a portion of the processed elastic wire 6a near the other end in the longitudinal direction near one end on a lower mold having a predetermined mold, and pressurizing the ram having the upper mold from above. You may form. The flat portion 36 has a flat surface 36a formed parallel to the x direction. Further, the flat portion 36
, Two adjustment holes 37a, 3 having an axis parallel to the y direction.
7b are provided in parallel in the z direction.

The two adjusting holes 37a and 37b are provided on the plane 3
6a, and inside the recess 18 provided in the base body 3, as shown in FIG.
The damper material 29 flows into the inside of the container 8 and becomes filled.
The adjustment holes 37 and 38 may be circular holes having an axis parallel to the y direction.

By providing the flat portion 36 with the adjusting hole as shown in FIG. 3, the vibration in the x direction causes the gel-like damper material 2 to the flat surface 36a of the flat portion 36 of the elastic wire 6b.
It is damped by the viscous resistance from 9 and the shearing force to the gel-like damper material 29 by the inner peripheral surfaces 37a and 38a of the two adjusting holes 37 and 38. This increases the damping effect in the x direction.

The vibration in the y direction is adjusted by adjusting holes 37 and 38 in the entire area of the flat surface 36a of the flat portion 36 of the elastic wire 6b.
The pressure is damped by the pressure from the damper material 29 with respect to the area excluding the cross-section integral and the viscous resistance from the damper material 29 to the inner peripheral surfaces 37a and 38a of the adjustment holes 37 and 38. This reduces the damping effect in the y direction.

Therefore, the flat portion 36 is provided with the adjusting holes 37 and 38.
By providing, the damping ratio for the vibration of the moving body 5 in the x direction and the damping ratio for the vibration of the moving body 5 in the y direction can be adjusted to be substantially equal.
Further, since the damping ratio for the vibration in the x direction and the damping ratio for the vibration in the y direction are substantially equal to each other, it is easy to set the exciting current flowing through the focus coil 20a for controlling in the x direction and the tracking coil 21a for controlling in the y direction. Can be done.

FIG. 4 is a view for explaining an elastic wire 6c which is still another embodiment. In still another embodiment, an elastic wire 6c is used instead of the elastic wire 6a of the optical pickup actuator 1a shown in FIG. Since the structure is similar to that of the elastic wire 6a shown in FIG. 2, the same structure may be designated by the same reference numeral and the description thereof may be omitted.

The elastic wire 6a, which is one embodiment, has
A flat portion 26 is provided near the other end portion in the longitudinal direction in order to improve the damping effect against vibration. On the other hand, in the elastic wire 6c according to yet another embodiment, in order to damp vibrations that are angularly displaced about axes parallel to the x-direction, the y-direction, and the z-direction, the vicinity of the other end in the longitudinal direction is reduced. Is provided with a damping action portion 46.

The elastic wire 6c has a bracket portion 25 at one end in the longitudinal direction. Further, the damping action portion 4 is provided in a portion near the other end portion in the longitudinal direction of the elastic wire 6c and near one end portion in the longitudinal direction.
6 are provided. The damping portion 46 of the elastic wire 6c is provided with a rising portion 41a in the direction close to the CD 10, and is connected to the rising portion 42a.
Extending portion 43 so as to extend toward one end side in the longitudinal direction of
a is provided. A rising portion 41b is provided in a direction away from the CD 10, and an extending portion 43b is provided so as to be continuous with the rising portion 42b and extend toward the other end side in the longitudinal direction of the elastic wire 6c. Elastic wire 6c
Is processed by etching a single plate made of beryllium bronze or phosphor bronze into a quadrangle having a width T of 0.1 mm as one side, and the bracket portion 25 and the rising portions 41a and 41b described above. The extending portions 43a and 43b are also processed to be integrally formed. Further, preferably, the cross-sectional shape perpendicular to the axis may be formed into a rectangle such as a square by pressing or forging.

The moving body 5 is moved in the x direction and the y direction by the focus coil 20a and the tracking coil 21a.
When the focus control and the tracking control are performed in the direction, as described above, vibrations such as yawing that makes an angular displacement in the X direction, pitching that makes an angular displacement in the Y direction, and rolling that makes an angular displacement in the Z direction occur. The elastic wire 6c is surrounded by the recess 18 and extends toward the one end in the longitudinal direction of the elastic wire 6c.
This vibration is suppressed by providing 43b.

The vibration showing the rolling angularly displaced in the Z direction will be described below. In this case, the rotation axis of the vibration indicating the rolling angularly displaced about the axis parallel to the Z direction coincides with the axis of the elastic wire 6c in the longitudinal direction. When the damping action portion 46 is angularly displaced about the axis in the extending portions 43a and 43b provided in the recess 18 in the direction away from the longitudinal axis of the elastic wire 6c of the damping action portion 46, A large rotation moment is required for the gel damper material 29. As a result, the vibration indicating rolling that tends to be angularly displaced about the axis parallel to the Z direction is suppressed. Similarly, for the other vibrations of yawing and pitching, the extended portions 43a and 43b require a large rotational moment with respect to the damper material, so that the vibrations of yawing and pitching are suppressed.

Therefore, the damping wire 4c is applied to the elastic wire 6c.
Since 6 is provided, it is possible to suppress vibration such as yawing that is angularly displaced in the X direction, pitching that is angularly displaced in the Y direction, and rolling that is angularly displaced in the Z direction that occur in the moving body. Further, the damping effect on these vibrations can be increased.

In the above embodiment, the optical disc such as CD which is a read-only recording medium has been described.
The same can be applied to a magneto-optical disk such as MD which is a recording medium that can be reproduced and recorded.

[0041]

As described above, according to the present invention, when the moving body is servo-controlled by the tracking driving means and the focus driving means, vibration is generated in the moving body. It is damped by the portion surrounded by the recess provided in the base body and the gel damper material filled in the recess. The portion of the support member surrounded by the recess is formed flat in the approaching and separating direction of the recording medium, and has a surface area larger than the surface area of the portion of the support member that is not formed flat. The flatly formed portion damps the vibration by the pressure from the damper material and the viscous resistance.
Therefore, since the surface of the portion of the support member surrounded by the recess is larger than the surface of the portion of the conventional support member surrounded by the recess, the damping effect on the vibration of the moving body is increased. Also,
Since only the portion of the support member surrounded by the recess is formed flat, the cost can be suppressed and the damping effect can be increased. Further, due to the increase in the damping effect, it is possible to shorten the time required for the vibration of the moving body to be damped and stopped.

Further, according to the present invention, when the support member is a round bar as in the prior art, it is difficult to integrally mold the fixing member to the moving body and it takes a lot of time to manufacture it. Since the bracket portion provided at the free end portion of the support member fixed to the mounting flange portion can be integrally formed by etching or the like, the manufacturing process can be simplified.

Further, according to the present invention, the portion of the supporting member surrounded by the recess provided in the base body is formed flat by press working or etching working. Therefore, the flat portion can be integrally formed with the support member by a simple manufacturing process.

Further, according to the present invention, the portion of the supporting member surrounded by the recess provided in the base body is formed flat, and the flattened portion is provided with the damping ratio adjusting hole having the axis parallel to the thickness direction. It is provided. Therefore, when the damping ratio adjusting hole is not provided, the damping ratio for the vibration of the recording medium in the approaching / separating direction is different from the damping ratio for the vibration of the recording medium in the vertical direction in the approaching / separating direction. By providing, it is possible to easily adjust the damping ratios in the respective directions to be substantially equal. Further, since the damping ratio for the vibration of the recording medium in the approaching / separating direction and the damping ratio for the vibration of the recording medium in the vertical direction of the approaching / separating direction are substantially equal to each other, the focus driving means for controlling the moving body in the approaching / separating direction of the recording medium. Also, it is possible to easily set the excitation current flowing in the tracking drive means for controlling the moving body in the direction perpendicular to the approaching / separating direction of the recording medium.

Further, according to the present invention, the moving body is provided with rolling that is angularly displaced about the axis of the support member, pitching that is angularly displaced about an axis parallel to the radial direction of the recording medium, and parallel to the approaching / separating direction of the recording medium. When vibration such as yawing that is angularly displaced about the axis is generated, the extending portion provided in the support member in the recess needs a large rotational moment about the axis with respect to the gel damper material. Due to this, the vibration that tries to rotate around the above-mentioned axis is
Attenuated. Therefore, since the rising portion and the extending portion are provided in the portion of the support member surrounded by the recess provided in the base body, the axis line of the support member in the longitudinal direction of the moving body, the axis line parallel to the radial direction of the recording medium, or It is possible to increase the damping effect on vibrations that are angularly displaced about the axis parallel to the approaching / separating direction of the recording medium.

[Brief description of drawings]

FIG. 1 is a perspective view of an optical pickup actuator 1a according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an elastic wire 6a according to the present embodiment.

FIG. 3 is a diagram for explaining an elastic wire 6b according to another embodiment of the present invention.

FIG. 4 is an elastic wire 6c according to yet another embodiment of the present invention.
It is a figure for explaining about.

FIG. 5 is a diagram for explaining a conventional elastic wire 6;

[Explanation of symbols]

 1a Optical pickup actuator 2 Base 3 Base 4 Wiring board 5 Moving body 6a, 6b, 6c Elastic wire 7 Objective lens 18 Recess 20a Focus coil 20b, 21b Magnet 21a Tracking coil 26, 36 Flat portion 26a, 36a Deflection plane 29 Damper Material 37, 38 Adjustment hole 41a, 41b Rise part 42a, 42b Tip part 43a, 43b Extension part 46 Damping action part

Claims (5)

[Claims] 1. An objective lens, which is provided so as to face a rotationally driven disc-shaped recording medium for reproducing or recording the recording medium, a movable body supporting the objective lens, and a free end portion attached to the movable body. An elastic support member extending in a direction substantially perpendicular to the radial direction of the recording medium, a base body to which a base end portion of the support member is fixed, and a base body and a movable body. Tracking drive means for driving the lens in the radial direction of the recording medium by using electromagnetic force along the track of the recording medium, and the objective lens, which is provided in association with the base body and the moving body, with respect to the recording medium. A recording medium provided with a focus driving unit that is driven in the vertical direction of the recording medium by using an electromagnetic force so as to keep the distance, and a substrate driving unit that drives the substrate in the radial direction to reproduce or record the recording medium. Regeneration Alternatively, in the recording device, a recess is formed in the base body in a portion surrounding a portion near the base end portion of the support member, which is fixed to the base body, near the free end portion, and the portion of the support member is a recording device. A reproducing or recording apparatus for a recording medium, wherein the recording medium is formed flat along the direction in which the medium approaches and separates, and a gel-like damper material that damps vibrations is filled in the recess. 2. The support member is such that the free end portion of the support member is fixed to the movable body on the inner side and the outer side of the recording medium in the radial direction, and the cross-sectional shape perpendicular to the axis of the support member is quadrangular. A reproducing or recording apparatus for a recording medium according to claim 1, wherein 3. The reproducing or recording apparatus for a recording medium according to claim 1, wherein the portion of the supporting member is formed flat by etching or partially pressing the supporting member. 4. The recording medium reproducing or recording apparatus according to claim 1, wherein a damping ratio adjusting hole having an axis parallel to a radial direction of the recording medium is formed in the portion of the supporting member. 5. The portion of the support member has a rising portion in a direction approaching or separating from the recording medium, and an extending portion continuous with a tip portion of the rising portion and extending in a vertical direction in a radial direction of the recording medium. The reproducing or recording apparatus for a recording medium according to claim 1, characterized in that it has.