JPH097319A - Optical pickup transfer device - Google Patents

Abstract

(57) [Summary] [Purpose] To suppress the loss of driving force, even during high-speed transfer of the optical pickup or under the condition where vibration is applied from the outside,
Stable operation shall be obtained. [Structure] A feed screw 7 is arranged on the base 2 in parallel with the moving direction of the optical pickup 6, and the feed screw 7 is attached to the base 2 so as to be rotatable around its axis, and the feed screw 7 is attached to the optical pickup 6 The nut piece 10 connected to the spring via the spring-like connecting means 11 is engaged with the nut piece 10, and
An optical pick-up transfer device configured by attaching a driving force generating means 8 for rotating the feed screw 7 to move the optical pickup 6 via a nut piece 10 to a feed screw 7, and a thin plate as a connecting means 11. Using two leaf springs 12 and 13 in the shape of
One end of each of the two leaf springs 12 and 13 was attached to the nut piece 10, and the other ends of the two leaf springs 12 and 13 were attached to the optical pickup 6 at a distance from the one end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup transfer structure used in a recording / reproducing apparatus for recording / reproducing information signals on a disc-shaped optical recording medium.

[0002]

2. Description of the Related Art A conventional optical pickup transfer device is shown in FIG.

This conventional optical pickup transfer device 20
Then, a spindle motor 22 for rotating a disc-shaped optical recording medium (not shown) is installed on the base 21, and two guide shafts 23 are attached in parallel with each other. Through the base 21
An optical pickup 24 is movably attached to the. Further, a feed screw 25 is arranged on the base 21 in parallel with the moving direction of the optical pickup 24.
Is attached to the base 21 so as to be rotatable about its axis, and a nut piece 27 is connected to the optical pickup 24 via a spring-like connecting means 26, and the nut piece 27 is fed by the elastic force of the connecting means 26. It is pressed against 25 and meshed with the feed screw 25. Further, the feed screw 25 includes a motor 2 for rotating the feed screw 25.
8 are attached.

In the conventional example configured as described above, since the optical pickup 24 records and reproduces information on the optical recording medium, the motor 28 rotates the feed spring 25 when moving. Since the thread groove surface of the nut piece 27 meshes with the feed screw 25, when the feed spring 25 rotates, the nut piece 27 is guided by the thread groove of the feed spring 25 and moved in the axial direction of the feed spring 25. . Since the nut piece 27 is connected to the optical pickup 24 via the connecting means 26, the thrust force is transmitted to the optical pickup 24 and the optical pickup 24 can be moved along the guide portion 23.

[0005]

However, in the above-mentioned conventional optical pickup transfer device 20, when the plate thickness of the connecting means 26 is increased or the length of the connecting means 26 is shortened, the nut piece 27 is suppressed. The force can be strengthened and the followability of the nut piece 27 on the feed screw 25 can be improved. However, in this case, the rigidity of the connecting means 26 is increased, and the reaction force against the bending of the connecting means 26 is the driving force, that is, the motor. There was a problem that the amount of load exerted on 28 was significantly increased.

On the other hand, in order to reduce the load on the motor 28, the plate thickness of the connecting means 26 is reduced and the nut piece 27 is reduced.
In the case where the pressure contact force by the connecting means 26 is reduced, the propulsive force transmitted by the nut piece 27 and the inertial and frictional forces of the optical pickup 25 are received when the optical pickup 24 operates at high speed, and the connecting means is reduced. There is a problem that 26 is twisted to reduce the transmission efficiency of the driving force and generate unnecessary vibration.

The present invention has been made by paying attention to the above-mentioned conventional problems, and suppresses the loss of the driving force, and is stable even when the optical pickup 24 is transported at high speed or under the condition where vibration is applied from the outside. It is an object of the present invention to provide an optical pickup transfer device that can achieve the above operation.

[0008]

In order to achieve the above object, an optical pickup transfer device according to the present invention has an optical pickup for picking up information of an optical recording medium as an electric signal on a base, and the optical pickup. A feed screw is arranged parallel to the direction in which it moves on the optical recording medium, the feed screw is rotatably mounted on the base about its axis, and the nut piece has a thread groove surface on the feed screw. , The nut piece is connected to the optical pickup through a spring-like connecting means, and the elastic force of the connecting means causes the feed screw to be crimped, and the feed screw is rotated by the feed screw. A drive force generating means for moving the optical pickup via the nut piece is attached and configured, and two plate blades are provided as the connecting means. Using the above, one end of each of these two leaf springs is attached to the nut piece, and the other end of each of the two leaf springs is attached to the optical pickup at a distance from the one end. .

Further, in the optical pickup transfer device according to the present invention, an optical pickup for picking up information of the optical recording medium as an electric signal is arranged on the base, and the optical pickup moves in the direction in which the optical pickup moves on the optical recording medium. A feed screw is arranged in parallel, and this feed screw is rotatably mounted on the base so as to be rotatable about its axis, and a nut piece having a thread groove surface is meshed with this feed screw. The optical pickup is connected to the optical pickup via a connecting means and is pressed against the feed screw by the elasticity of the connecting means, and the feed screw is rotated by the feed screw to move the optical pickup via the nut piece. A drive force generating means for
As the connecting means, a pair of parallel side portions having different lengths and a connecting portion connecting both ends of the pair of side portions are used to form a thin plate material having a substantially trapezoidal frame shape. Of the parts, the short side was attached to the nut piece, and the long side was attached to the optical pickup.

Further, in the optical pickup transfer device according to the present invention, an optical pickup for picking up information of the optical recording medium as an electric signal is arranged on the base, and the optical pickup moves in the direction in which the optical pickup moves on the optical recording medium. A feed screw is arranged in parallel, and this feed screw is rotatably mounted on the base so as to be rotatable about its axis, and a nut piece having a thread groove surface is meshed with this feed screw. The optical pickup is connected to the optical pickup via a connecting means and is pressed against the feed screw by the elasticity of the connecting means, and the feed screw is rotated by the feed screw to move the optical pickup via the nut piece. A drive force generating means for
As the connecting means, a leaf spring having a rectangular shape is used,
A plurality of beads are formed in the lateral direction of the leaf spring, the beads are arranged in parallel with the moving direction of the optical pickup, and both ends of the leaf spring are attached to the nut piece and the optical pickup. .

[0011]

With the above construction, in the optical pickup transfer device according to the present invention, in the transfer operation of the optical pickup, even if a torsion torque is applied to the nut piece, the two leaf springs are arranged radially around the nut piece side. Since it is mounted on the optical pickup, a force for supporting between the leaf springs is generated. Therefore, the torsional rigidity as the connecting means can be increased. Also, 2
Since each leaf spring is formed in a thin plate shape, bending rigidity can be suppressed to be low.

Further, in the optical pickup transfer device according to the present invention, a thin plate material formed in a substantially trapezoidal frame shape is used as the connecting means, and the short side portion of the pair of parallel side portions of the connecting means. While attaching to the nut piece,
Because the long side was attached to the optical pickup,
The portion of the connecting means effective as a spring, that is, the connecting portion is arranged radially around the nut piece side and is attached to the optical pickup. For this reason, even if a twisting torque is applied to the nut piece, a supporting force is generated between the connecting portions, so that the torsional rigidity as the connecting means can be increased. Further, since the connecting means is formed of a thin plate, the bending rigidity can be suppressed low.

Further, in the optical pickup transfer device according to the present invention, the connecting means is formed by forming a plurality of beads in a lateral direction on a leaf spring having a rectangular shape, and the bead is the optical means. Since the nut piece and the optical pickup are attached so as to be arranged in parallel with the moving direction of the pickup, even if a torsion torque is applied to the nut piece, the twist of the connecting means is suppressed by the bead, and the connecting means serves as the connecting means. Torsional rigidity can be increased. Further, the connecting means can have a low bending rigidity by forming the bead.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical pickup transfer device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of an optical pickup transfer device according to the first embodiment of the present invention, and FIG. 2 (1) is a plan view showing the structure of a connecting means of the optical pickup transfer device. (2) is a cross-sectional view taken along the line AA in FIG. 1A. In these drawings, the optical pickup transfer device 1 includes a spindle motor 4, an optical pickup 6, a feed screw 7, and a drive screw on a base 2. A nut 8 is engaged with the feed screw 7, and the nut piece 10 and the optical pickup 6 are connected to each other by a connecting means 11.

The base 2 is a plate-shaped member having an opening 2a in the center thereof, and a spindle motor 4 for rotating the optical recording medium 3 on the disk is installed on one side of the base 2 and the opening 2a is provided. Two cylindrical guide parts 5 are laid in parallel on 2a, and both ends of the guide parts 5 are on the base 1.
Are attached to the opening edge portions 2b and 2c. An optical pickup 6 is slidably attached to the guide portion 5. The positional relationship among the spindle motor 4, the guide portion 5, and the optical pickup 6 is determined by a turntable (which is attached to the back surface of the spindle motor 4). When the optical recording medium 3 is mounted on the optical recording medium 3 (not shown), the radius l of the optical recording medium 3 is
The detection point 6a of the optical pickup 6 is set to move above.

A feed screw 7 is arranged at the opening edge 2d of the base 1 in parallel with the moving direction of the optical pickup 6, and the feed screw 7 has its end 7a fixed on the base 1. Is attached to the shaft 8a of the motor 8, and the center of the end face 7b of the feed screw is point-supported by the support member 9 attached to the base 1. The feed screw 7 drives the motor 8 to move its axis. It is designed to rotate around the heart.

As described above, the feed screw 7 is in mesh with the nut piece 10. The nut piece 10 has a thread groove surface 10 meshing with the feed screw 7 on one surface thereof.
2a), one end of the connecting means 11 is attached to the back side of the thread groove surface 10a with a screw 14 and the other end of the connecting means 11 is formed. Is attached to the optical pickup 6 with a screw 14, the nut piece 10 is connected to the optical pickup 6, and the nut piece 10 is pressed against the feed screw 7 by the elasticity of the connecting means 11.

The connecting means 11 is composed of two thin plate-shaped leaf springs 12 and 13, and the distance between the leaf springs 12 and 13 attached to the nut piece 10 is fixed to the optical pickup 6. The leaf springs 12 and 13 are arranged radially around the nut piece 10 side so that the leaf springs 12 and 13 are spaced from each other and are not parallel to each other on the bending plane.

Next, the transfer operation of the optical pickup 6 in the optical pickup transfer device 1 having the above structure will be described.

In the optical pickup transfer device 1 having the above-mentioned structure, in order to record and reproduce information on the optical recording medium 3, when the optical pickup 6 is moved on the radius of the optical recording medium, first, the feed spring 7 is moved by the motor 8. Rotate. The thread groove surface 10 a of the nut piece 10 is the thread groove surface 1 of the feed spring 7.
As the feed spring 7 rotates, the nut piece 10 is guided by the thread groove 7a of the feed spring 7 and moved in the axial direction of the feed spring 7 because it meshes with 0a. Since the nut piece 7 is connected to the optical pickup 6 via the connecting means 11, the thrust force is transmitted to the optical pickup 6 and the optical pickup 6 can be moved along the guide portion 4.

Further, as shown in FIG. 2 (1), in the above moving operation, even if the torsion torque T is applied to the nut piece 10 along with the movement of the nut piece 10, the two leaf springs cause the two leaf springs to move toward the nut piece 10 side. Since they are arranged radially with respect to the center and are attached to the optical pickup 6, a force for supporting between the leaf springs 12 and 13 is generated. For this reason,
The torsional rigidity of the connecting means 11 can be increased,
It is possible to prevent a decrease in the driving force transmission efficiency due to the twist of the connecting means 11 and the occurrence of unnecessary vibration.

Further, the amount of displacement of the nut piece 10 with respect to the torsion torque T can be suppressed to a very small extent, and the nut piece 10 can be stably pressed against the feed screw 7 even when the optical pickup 6 is transported at high speed.

Further, since the leaf springs 12 and 13 are formed as thin plates, as shown in FIG. 2 (2), the bending rigidity against the force F for bending the leaf spring is kept low, and the feed screw is The force to suppress 7 is moderately suppressed to reduce the load on the driving force. Also, by reducing the bending rigidity, even if there is an error in the mounting position caused by variations in parts,
The change in weight due to the leaf spring can be suppressed to a small level.

As described above, according to the first embodiment, two thin leaf springs 12 and 13 are used as the connecting means 11, and the two leaf springs 12 and 13 are connected to the nut piece 1.
By connecting the nut piece 10 and the optical pickup 6 with a wider space between the mounting parts on the optical pickup side than a space between the mounting parts on the 0 side, the connecting means 11 is provided.
The bending rigidity is suppressed to a low level to reduce the load of the driving force, and the torsional rigidity as the connecting means 11 is increased to prevent the reduction of the transmission efficiency of the driving force and the occurrence of unnecessary vibration.
High-speed and stable transfer of the optical pickup can be performed.

Next, the second and third embodiments of the optical pickup transfer device according to the present invention will be described. These second and third embodiments are the connecting means of the first embodiment shown in FIG. 11 is a modified example, and the other configurations are the same as those in the first embodiment.

FIG. 3 (1) is a plan view showing the structure of the connecting means of the optical pickup transfer device according to the second embodiment of the present invention, and FIG. 3 (2) is a view taken in the direction of arrow B in FIG. 3 (1). However, in these drawings, the connecting means 11 uses a thin plate-shaped spring plate member 16 formed in a substantially trapezoidal frame shape. The spring plate member 16 includes parallel side portions 11a and 11b and these side portions. Connecting parts 11c and 11 for connecting the part 11a and the side part 11b
d of the side portion 11a and the side portion 11b, the side portion 11a having the shorter length is used as the nut piece 10, and conversely, the side portion 11a.
The b side is fixed to the optical pickup 6 with screws 14, respectively.

In the second embodiment, the spring plate member 16 is
Portions effective as springs, that is, the connecting portions 11c and 11d
Are arranged radially around the nut piece 10 side,
The nut piece 10 and the optical pickup 6 are connected. Therefore, the leaf springs 12 and 13 in the first embodiment are
Similarly, when a torsional torque T is applied to the nut piece 10, a supporting force is generated between the connecting portions 11c and 11d.

Therefore, the bending rigidity of the connecting means 11 can be suppressed and only the torsional rigidity can be enhanced, and the same effect as that of the first embodiment can be obtained. Further, in this embodiment, since the connecting means 11 is integrated, the number of parts is reduced and the assembling can be facilitated.

FIG. 4 (1) is a plan view showing the construction of the connecting means of the optical pickup transfer device according to the third embodiment of the present invention, and FIG. 4 (2) is a view taken in the direction of arrow C in FIG. 4 (1). In these figures, the connecting means 11 forms a bead 15a parallel to the lateral direction of the rectangular leaf spring 15, and further arranges the bead 15a parallel to the moving direction of the optical pickup 6. Then, both ends of the leaf spring 15 are attached to the nut piece 10 and the optical pickup 6, respectively.

In the third embodiment, the bead 15a formed on the leaf spring 15 is arranged in parallel with the moving direction of the optical pickup 6, so that when the torsion torque T is applied to the nut piece 10, the bead 15a is moved by the bead 15a. Connection means 11
Is suppressed, and the torsional rigidity of the connecting means 11 is enhanced. Further, the force F for bending the leaf spring 15 shown in FIG.
On the other hand, since the bead 15a makes the leaf spring 15 bend easily, the bending rigidity of the connecting means 11 can be suppressed to a low level. Therefore, similarly to the leaf springs 12 and 13 in the first embodiment, the torsional rigidity can be increased while reducing the bending rigidity as the connecting means 11, and the same effect as the first embodiment can be obtained. Further, in this embodiment, the second
Since the connecting means 11 is integrated as in the case of the above embodiment, the number of parts is reduced and the assembling can be facilitated.

[0032]

As described above, in the optical pickup transfer device according to the first aspect of the present invention, in the transfer operation of the optical pickup, even if a torsion torque is applied to the nut piece, the two leaf springs center on the nut piece side. Since they are radially arranged and attached to the optical pickup, a supporting force is generated between the leaf springs. For this reason,
The torsional rigidity as the connecting means can be increased. Further, since the two leaf springs are formed in a thin plate shape, the bending rigidity can be suppressed low.

Further, in the optical pickup transfer device according to the second aspect of the present invention, a thin plate material formed in a substantially trapezoidal frame shape is used as the connecting means, and the short side of the pair of parallel side portions of the connecting means. Since the part is attached to the nut piece and the long side is attached to the optical pickup, the effective portion of this connecting means as a spring, that is, the connecting portion is arranged radially around the nut piece side and is attached to the optical pickup. . For this reason, even if a twisting torque is applied to the nut piece, a supporting force is generated between the connecting portions, so that the torsional rigidity as the connecting means can be increased. Further, since the connecting means is formed of a thin plate, the bending rigidity can be suppressed low. Further, since the connecting means is integrated, the number of parts is reduced and the assembling can be facilitated.

Further, in the optical pickup transfer device according to a third aspect of the present invention, the connecting means is formed by forming a plurality of beads in a lateral direction on a leaf spring having a rectangular shape, and the bead is formed by the above-mentioned bead. Since the nut piece and the optical pickup are attached so as to be arranged in parallel with the moving direction of the optical pickup, even if a torsion torque is applied to the nut piece, the twist of the connecting means is suppressed by the bead, and as a connecting means, The torsional rigidity of can be increased. Further, the connecting means can have a low bending rigidity by forming the bead. Further, since the connecting means is integrated, the number of parts is reduced and the assembling can be facilitated.

As described above, in the optical pickup transfer device according to the present invention, the bending rigidity of the connecting means can be suppressed to be low, and only the torsional rigidity of the connecting means can be increased. Therefore, while reducing the load on the driving force,
When a torque is applied to the nut piece, it is possible to prevent the transmission efficiency of the driving force from being reduced due to the twist of the connecting means and the occurrence of unnecessary vibration.

Further, the amount of displacement of the nut piece with respect to the torsional torque is suppressed to a very small extent, and the nut piece can be stably pressed against the feed screw even when the optical pickup is transported at high speed.

[Brief description of drawings]

FIG. 1 is a plan view of an optical pickup transfer device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a configuration of a connecting means of the optical pickup transfer device. (2) A sectional view taken along the line 1A-A of FIG.

FIG. 3 is a plan view showing the structure of a connecting means of an optical pickup transfer device according to a second embodiment of the present invention. (2) A view from the arrow B of FIG.

FIG. 4 (1) is a plan view showing the structure of the connecting means of the optical pickup transfer device according to the third embodiment of the present invention. (2) FIG. 4 (1) is a view on arrow C.

FIG. 5 is a plan view of a conventional optical pickup transfer device.

[Explanation of symbols]

 1 Optical Pickup Transfer Device 2 Base 3 Optical Recording Medium 6 Optical Pickup 7 Feed Screw 8 Motor (Driving Force Generation Means) 10 Nut Piece 11 Connecting Means 12, 13 Leaf Springs

Claims (3)

[Claims] 1. An optical pickup for taking out information of an optical recording medium as an electric signal is arranged on a base, and a feed screw is arranged in parallel with a direction in which the optical pickup moves on the optical recording medium. A feed screw is mounted on the base so as to be rotatable about its axis, a nut piece having a thread groove surface is meshed with the feed screw, and the nut piece is connected to the optical pickup via a spring-like connecting means. At the same time, the connecting force of the connecting means is crimped to the feed screw, and the feed screw is provided with a driving force generating means for rotating the feed screw to move the optical pickup through the nut piece. As the connecting means, two thin plate-shaped leaf springs are used, and one end of each of these two leaf springs is attached to the nut piece, An optical pickup transfer device, characterized in that the other ends of the two leaf springs are attached to the optical pickup with a distance from the one end. 2. An optical pickup for picking up information of an optical recording medium as an electric signal is arranged on a base, and a feed screw is arranged in parallel with a direction in which the optical pickup moves on the optical recording medium. A feed screw is mounted on the base so as to be rotatable about its axis, a nut piece having a thread groove surface is meshed with the feed screw, and the nut piece is connected to the optical pickup via a spring-like connecting means. At the same time, the connecting force of the connecting means is crimped to the feed screw, and the feed screw is provided with a driving force generating means for rotating the feed screw to move the optical pickup through the nut piece. As the connecting means, a pair of parallel side portions having different lengths, and a connecting portion connecting both ends of the pair of side portions,
Using a thin plate material formed in a substantially trapezoidal frame shape, the short side portion of the pair of side portions is attached to the nut piece,
An optical pickup transfer device having a long side attached to an optical pickup. 3. A pickup for picking up information of an optical recording medium as an electric signal is arranged on a base, and a feed screw is arranged in parallel with a direction in which the optical pickup moves on the optical recording medium. A screw is mounted on the base so as to be rotatable about its axis, a nut piece having a thread groove surface is meshed with the feed screw, and the nut piece is connected to the optical pickup through a spring-like connecting means. Both are configured to be crimped to the feed screw by the elastic force of the connecting means, and to the feed screw, a driving force generating means for rotating the feed screw to move the optical pickup via the nut piece is attached.
As the connecting means, a leaf spring having a rectangular shape is used,
A plurality of beads are formed in the lateral direction of the leaf spring, and the leaf spring is attached to the nut piece and the optical pickup so that the bead is arranged in parallel to the moving direction of the optical pickup. Optical pickup transfer device.