JP2005259254A - Optical pickup feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noise by suppressing vibration of an optical pickup supporting member and to improve reading performance of the optical pickup. <P>SOLUTION: An optical pickup feeding device includes an optical pickup supporting member 5 which is provided with an optical pickup 6 that conducts at least one of the signal recording operation or the signal reproducing operation for a disk, a lead screw 11 in which a screw groove 12 is formed on the outer peripheral surface; and a meshing member 14 for feeding on which a tooth section 16 that is meshed to the screw groove 12. The meshing member 14 for feeding is formed into the shape in which the total of the width sizes in its middle section is made to be less than the total of the width sizes in other portions. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical pickup feeding device.

  2. Description of the Related Art Conventionally, a disk drive device for performing at least one of a signal recording operation and a reproducing operation on a disk-shaped recording medium (hereinafter referred to as a disk) is known. The disk drive device includes an optical pickup support member that supports the optical pickup so as to be movable in a predetermined direction and range, and a disk drive device including a motor and a turntable for reading information recorded on the disk. And a reproducing unit provided. The optical pickup supported by the optical pickup support unit records and reproduces signals with respect to the disc by rotating the turntable in a state where the disc is held by a motor. The structure is such that recording or reproduction is performed.

  Such a disk drive apparatus is provided with an optical pickup feeding apparatus 102 as shown in FIGS. 10 to 16 in order to move the optical pickup 101. The optical pickup feeder 102 generally rotates a lead screw 105 having a helical thread groove 104 formed on the outer peripheral surface thereof by a motor 103, and one end is fixed at a predetermined position of the optical pickup support member 106. An optical pickup provided with the optical pickup 101 together with the feeding engagement member 107 by the tooth portion 108 formed at the other end of the engagement member 107 moving along the screw groove 104 formed in the lead screw 105. The support member 106 is moved along the axis of the lead screw 105.

  The optical pickup feeding device 102 that employs the above-described mechanism is provided with a main guide member 108 and a sub guide member 109. Of these, the main guide member 108 is a pickup support member as shown in FIGS. The optical guide support member 106 is movably supported by being inserted into an insertion hole 111 formed in the main guide member receiving portion 110 provided in 106. However, when an endurance test for repeatedly moving the optical pickup support member 106 was performed, shaving powder, sludge having deteriorated lubricating oil, or the like was generated in the main guide member 108 and the main guide member receiving portion 110, and the main guide There is a problem that clogging occurs in a gap formed between the member 108 and the main guide member receiving portion 110, and the optical pickup supporting member 106 becomes immovable.

Therefore, it is possible to prevent sliding failure due to clogging occurring in the gap between the main guide member receiving portion 110 provided on the optical pickup support member 106 and the main guide member 108 and to extend the life of the parts. As shown in FIGS. 10 and 11, as the optical pickup feeding device 102, a main guide member 108 in which a groove 112 is formed to release shaving powder, sludge having deteriorated lubricating oil from the outer surface of the main guide member 108. An optical pickup feeding device 102 provided has been developed (see, for example, Patent Document 1).
JP 2003-123410 A

  However, when a stepping motor is used as the motor of the optical pickup feeding device, if the torque fluctuation and the speed fluctuation (hereinafter referred to as cogging) occur during pulse driving, the movement operation of the optical pickup support member is, for example, detailed. Such as repeated moving and stopping operations. Further, in addition to the influence on the operation of the optical pickup support member, the optical pickup support member is caused by its own weight due to a gap formed between the main guide member and the insertion hole provided in the main guide member receiving portion. There is a problem that the inertial force oscillates in the guide direction X of the lead screw to generate noise or deteriorate the reading performance of the optical pickup.

  The present invention has been made in view of the above points, and provides an optical pickup feeding device that can suppress vibration of an optical pickup support member, reduce noise, and improve the reading performance of the optical pickup. The purpose is to provide.

An optical pickup feeding device according to the invention of claim 1 is:
An optical pickup supporting member provided with an optical pickup that performs at least one of a signal recording operation and a reproducing operation on a disc;
A lead screw having a thread groove formed on the outer peripheral surface;
An optical pickup feeding device configured to include a feeding meshing member fixed to the optical pickup supporting member and formed with a tooth portion meshed with the screw groove,
The feeding engagement member is formed in a shape such that the sum of the width dimensions in the middle portion thereof is smaller than the sum of the width dimensions in the other portions.

  The optical pickup feeding device according to a second aspect of the present invention is characterized in that constrictions are formed on both sides of the middle portion of the feeding engagement member.

  An optical pickup feeding device according to a third aspect of the present invention is characterized in that an opening is formed in the middle of the feeding meshing member.

  According to the present invention, an optical pickup supporting member provided with an optical pickup that performs at least one of a signal recording operation and a reproducing operation with respect to a disk, a lead screw having a thread groove formed on an outer peripheral surface, and an optical pickup. A feed meshing member fixed to the support member and formed with a tooth portion meshed with the thread groove, and the feed meshing member has a total width dimension in the other portion of the other portion. Since it is formed in a shape that is smaller than the total width dimension, it is possible to suppress vibration of the optical pickup support member due to cogging by making it difficult for cogging by the motor to be transmitted to the optical pickup support member. Thus, noise can be reduced and reading performance of the optical pickup can be improved.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples.

The optical pickup feeder 1 in this embodiment will be described with reference to FIGS. 1 to 9. Here, FIGS. 2, 5, and 7 are enlarged views of portions where the lead screw 11 and the feeding meshing member 15 in FIGS. 1, 4, and 6 abut.
As shown in FIG. 1, in the optical pickup feeding device 1 according to the present embodiment, each component is covered with a housing (not shown). A chassis 2 is provided inside the casing, and a sub guide member 3 extending in a rail shape is formed in the chassis 2. Here, a direction in which the auxiliary guide member 3 extends is defined as a guide direction X.
A cylindrical main guide member 4 extending in the guide direction X is disposed inside the housing in parallel to the sub guide member 3 at a predetermined interval, and both ends of the main guide member 4 are screwed. The chassis 2 is fixedly supported by means such as a stopper.

  An optical pickup support member 5 is provided between the main guide member 4 and the sub guide member 3, and this optical pickup support member 5 rotates while being held by a turntable (not shown). An optical pickup 6 is provided for performing at least one operation of recording and reproducing signals on a disc (not shown).

  The optical pickup 6 is provided with a light source (not shown) for irradiating the disc with laser light, and the laser beam emitted from the light source is recorded on the surface facing the disc. An objective lens 7 for condensing light on the surface is provided. The optical pickup 6 is provided with a biaxial actuator (not shown) that displaces the objective lens 7 in the direction of the optical axis of the objective lens 7 and in the direction orthogonal to the optical axis direction of the objective lens 7. The biaxial actuator is a focusing servo that adjusts the focus of the objective lens 7 on the signal recording surface of the disc while displacing the objective lens 7 in the optical axis direction of the objective lens 7 and in the direction orthogonal to the objective lens 7. Drive control such as a tracking servo is performed so that the spot position of the laser beam condensed by the lens 7 is always positioned on the recording track.

  A surface of the optical pickup support member 5 that faces the sub guide member 3 is provided with a sub guide member receiving portion 8 having a concave cross section to be engaged with the sub guide member 3. A main guide member receiving portion 9 having an insertion hole 10 through which the main guide member 4 is inserted is provided on the side facing the main guide member 4. Then, the sub-guide member receiving portion 8 of the optical pickup support member 5 is engaged with the sub-guide member 3 and the optical guide is inserted in the state where the main guide member 4 is inserted into the insertion hole 10 of the main guide member receiving portion 9. The support member 5 can move along the guide direction X while being guided by the main guide member 4 and the sub guide member 3.

  Note that, on the outer peripheral surface of the main guide member 4 of the present embodiment, shaving powder generated by sliding between the main guide member receiving portion 9 and the main guide member 4, sludge generated by deterioration of the lubricating oil, and the like are mainly used. A concentric groove for facilitating removal from the guide member 4 may be provided. The groove is not limited to a concentric shape, and may be provided in a spiral shape, or a plurality of holes may be provided instead of the groove. The width, depth, shape, etc. of the groove may be determined in consideration of the strength of the main guide member 4, the amount of sludge generated, the ease of sliding with the optical pickup support member 5, and the like. Further, the groove may be provided not only in the main guide member 4 but also in the sub guide member 3.

  A columnar lead screw 11 disposed in parallel to the main guide member 4 is rotatably provided by a bearing (not shown) on the opposite side of the main guide member 4 from the optical pickup 6. A spiral thread groove 12 is provided on the outer peripheral surface of the.

  A motor 13 is connected to one end of the lead screw 11 via a rotation transmission mechanism (not shown). The rotation transmission mechanism includes, for example, a worm and a worm wheel (both not shown), and rotates the lead screw 11 by transmitting the driving force of the motor 13 to the lead screw 11 via the worm and worm wheel. It comes to drive.

  In addition, although the stepping motor is used for the motor 13 in this embodiment, it is not limited to this, A linear motor etc. are applicable.

  Further, a feeding engagement member 14 having a distal end portion extending above the lead screw 11 is attached above the main guide member 4 side of the optical pickup 6, and is attached to the lower surface of the distal end portion of the feeding engagement member 14. The tooth portion 16 that is engaged with the screw groove 12 provided in the lead screw 11 is protruded. A plate spring 15 formed of an elastically deformable synthetic resin or the like is provided on the upper surface of the feeding engagement member 14, and one end of the plate spring 15 is fixed to the optical pickup support member 5 by screws, The other end is disposed above the lead screw 11. Further, constricted portions 17 are formed on both sides of the midway portion of the feeding engagement member 14 so that the total width dimension in the midway portion is smaller than the total width size in other portions. It has become.

  In addition, the constricted portions 17 are respectively formed on both sides of the midway portion of the feeding engagement member 14 in the present embodiment, but the total width dimension in the midway portion is larger than the total width size in other portions. As long as it is formed in such a shape that it is reduced, it is not limited to the constricted portion 17, and an opening 18 may be formed inside as shown in FIGS. 8 and 9.

Next, the operation of this embodiment will be described.
When predetermined information is transmitted to the optical pickup feeding device 1, the motor 13 rotates and the driving force of the motor 13 is transmitted to the lead screw 11 through the rotation transmission mechanism. With this driving force, the lead screw 11 is rotated around the axis, and the tooth portion 16 of the feeding meshing member 14 meshed with the thread groove 12 of the lead screw 11 receives a force in the guide direction X, whereby the feeding meshing member 14, the optical pickup support member 5 is moved in the guide direction X.

  Thereafter, the signal recording surface of the rotating disc held by the turntable is irradiated with laser light collected by the objective lens 7 provided in the optical pickup 6, thereby recording the signal. Playback or recording or playback is performed.

  Further, the series of operations described above are performed, and at least one of the signal recording operation and the reproducing operation with respect to the disc by the optical pickup 6 is completed.

  As described above, when a stepping motor is used as the motor 13, if cogging occurs during pulse driving, the movement operation of the optical pickup support member 5 is affected, for example, by repeating fine movement and stopping operations. give. Further, in addition to the influence on the movement operation of the optical pickup support member 5, an optical pickup support is provided by a gap formed between the main guide member 4 and the insertion hole 10 provided in the main guide member receiving portion 9. The member 5 tends to vibrate in the guide direction X of the lead screw 11 by its own inertia force.

  At this time, the constricted portions 17 are formed on both sides of the middle portion of the feeding engagement member 14, so that in the conventional optical pickup feeding device 1, it is directly transmitted to the optical pickup support member 5 via the feeding engagement member 14. As for the vibration in the guide direction X, only a part of the vibration is directly transmitted to the optical pickup support member 5 by the constricted portion 17, and the remaining vibration is transmitted to the leaf spring 15 provided in the feeding engagement member 14. . Since the leaf spring 15 is formed of synthetic resin, the remaining vibration is absorbed by the leaf spring 15 and transmission to the optical pickup support member 5 is suppressed.

  As described above, according to the present embodiment, the optical pickup supporting member 5 provided with the optical pickup 6 that performs at least one of the signal recording operation and the reproducing operation with respect to the disk, and the screw groove 12 are formed on the outer peripheral surface. The lead screw 11 and the feeding meshing member 14 fixed to the optical pickup supporting member 5 and having the tooth portion 16 meshed with the screw groove 12 are formed. Since the total width dimension in the midway portion is formed to be smaller than the total width dimension in the other portions, cogging by the motor 13 is made difficult to be transmitted to the optical pickup support member 5, thereby reducing cogging. It is possible to suppress the vibration of the optical pickup support member 5 caused thereby, thereby reducing noise and the optical pickup 6. It is possible to improve the reading performance.

It is a front view which shows the optical pick-up feeder in this embodiment. It is an enlarged view which shows the part which the lead screw and feeding meshing member of the optical pick-up feeding apparatus in this embodiment contact | abut. It is a top view which shows the meshing member for sending of the optical pick-up feeding apparatus in this embodiment. It is a right view which shows the optical pick-up feeder in this embodiment. It is an enlarged view which shows the part which the lead screw and feeding meshing member of the optical pick-up feeding apparatus in this embodiment contact | abut. It is a top view which shows the optical pick-up feeder in this embodiment. It is an enlarged view which shows the part which the lead screw and feeding meshing member of the optical pick-up feeding apparatus in this embodiment contact | abut. It is a top view in the 1st modification of the meshing member for sending in the optical pick-up sending device concerning the present invention. It is a top view in the 2nd modification of the meshing member for sending in the optical pick-up sending device concerning the present invention. It is a front view which shows the optical pick-up feeder in a prior art. It is an enlarged view which shows the part which the lead screw of the optical pick-up feeding apparatus in a prior art, and the meshing member for feeding contact | abut. It is a top view which shows the meshing member for sending of the optical pick-up feeding apparatus in a prior art. It is a right view which shows the optical pick-up feeder in a prior art. It is an enlarged view which shows the part which the lead screw of the optical pick-up feeding apparatus in a prior art, and the meshing member for feeding contact | abut. It is a top view which shows the optical pick-up feeder in a prior art. It is an enlarged view which shows the part which the lead screw of the optical pick-up feeding apparatus in a prior art, and the meshing member for feeding contact | abut.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical pick-up feeder 5 Optical pick-up support member 6 Optical pick-up 11 Lead screw 12 Screw groove 14 Feeding engagement member 16 Tooth part 17 Neck part

Claims (3)

An optical pickup supporting member provided with an optical pickup that performs at least one of a signal recording operation and a reproducing operation on a disc;
A lead screw having a thread groove formed on the outer peripheral surface;
An optical pickup feeding device configured to include a feeding meshing member fixed to the optical pickup supporting member and formed with a tooth portion meshed with the screw groove,
2. The optical pickup feeding device according to claim 1, wherein the feeding meshing member is formed in a shape such that a total width dimension in the middle portion is smaller than a total width dimension in other portions.   2. The optical pickup feeding device according to claim 1, wherein constricted portions are formed on both sides of the middle portion of the feeding engagement member.   The optical pickup feeding device according to claim 1, wherein an opening is formed inside the middle portion of the feeding engagement member.

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