JP2010092570A - Optical disk drive and method for cleaning objective lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive for effectively cleaning an objective lens without using another member. <P>SOLUTION: An optical pickup is provided with: a lens unit 54 which includes an objective lens 50 condensing light radiated from a light source and a lens holder 52 holding the objective lens; an actuator 56 which drives the lens unit 54 in a tracking direction and a focusing direction; and a stopper 62 which regulates the movable range of the lens unit 54. In cleaning the lens, a servo processor 30 controls the actuator 56, causing the lens unit 54 to collide with the stopper 62. At that time, foreign substances adhering to the objective lens 50 fly off, thereby removing the foreign substances. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical disc drive that performs at least one of data recording and reproduction by irradiating spot light onto an optical disc that is driven to rotate, and a method for cleaning an objective lens mounted on the optical disc drive.

  2. Description of the Related Art Conventionally, an optical pickup device that irradiates a laser beam to an optical disk medium in order to record data on an optical disk medium such as an optical disk or a magneto-optical disk or reproduce data from the optical disk medium is known. In such an optical pickup device, an objective lens that collects light from a light source is provided. If foreign matter such as dust or dust adheres to the surface of the objective lens and the volume thereof, data recording / reproducing accuracy may be reduced.

  In order to solve such a problem, a disk in which a cleaning brush is implanted, that is, a so-called lens cleaner disk is conventionally known. When this lens cleaner disk is driven to rotate by a turntable instead of the optical disk medium, the dust deposited on the surface of the objective lens is wiped off by the cleaning brush implanted in the cleaner disk. Yes. In some cases, a technique for removing foreign substances by vibrating the objective lens up and down and / or left and right has been proposed (for example, Patent Document 1 below).

JP 2005-327350 A

  However, the method of preparing other members such as a lens cleaner disk for cleaning the objective lens and setting it in the disk drive is not only cumbersome for the user, but it also takes time and cost to obtain the lens cleaner disk. was there. Moreover, according to the technique of vibrating the objective lens, this problem can be solved to some extent. However, there is a problem that it is difficult to remove foreign substances simply by vibrating the objective lens, and the cleaning effect is poor.

  Therefore, an object of the present invention is to provide an optical disk drive and an objective lens cleaning method that can more effectively clean the objective lens without using other members.

  An optical disk drive of the present invention is an optical disk drive that performs at least one of data recording and reproduction by irradiating spot light onto an optical disk that is rotationally driven, and a light source that irradiates light for data recording or reproduction; A lens unit including an objective lens that collects light emitted from the light source and a lens holder that holds the objective lens, a drive mechanism that drives the lens unit in a tracking direction and a focus direction, and a movable of the lens unit A stopper for restricting the range, and a stopper that inhibits movement beyond the movable range by contacting at least a part of the lens unit that attempts to move beyond the movable range, and controls the operation of the drive mechanism. Control means for removing foreign matter adhering to the surface of the objective lens; During lens cleaning, characterized in that it comprises a control means for controlling the drive mechanism impinging the lens unit to the stopper.

  In a preferred aspect, at least one of the stopper and the lens unit is a member provided in a portion that contacts the other during the collision, and the rigidity is adjusted to adjust the acceleration of the lens unit generated by the collision. An acceleration adjusting member is provided.

  In another preferable aspect, at the time of the lens cleaning, at least one of the lens unit and the foreign matter raised by the collision is moved at least in a direction perpendicular to the focus direction, so that the lens unit and the foreign matter raised. And a separating means for separating the two from each other. The separation means includes a sled moving mechanism for moving the light pickup united with the light source, the lens unit, and the drive mechanism in the radial direction of the optical disc, and the control means controls the drive mechanism during the lens cleaning. Then, it is desirable that the lens unit collide with the stopper, and the sled mechanism is controlled to move the optical pickup in the radial direction. The separation means includes a disk rotation mechanism for rotating the optical disk, and the control means controls the drive mechanism to cause the lens unit to collide with the stopper during the lens cleaning, and the disk rotation mechanism. It is also desirable to move the foreign matter soared by the collision by the air flow generated by the rotation by rotating the optical disc by controlling the above.

  In another preferred aspect, the control means further controls the drive mechanism to vibrate the lens unit during the lens cleaning. In this case, it is desirable that the frequency of the vibration is an integer multiple of the resonance frequency.

  In another preferred aspect, a concave portion is formed in one of the objective lens and the lens holder, and the objective lens is engaged with the concave portion in the other of the objective lens and the lens holder. Convex portions that prevent the lens holder from being detached from the lens holder are formed.

  According to another objective lens cleaning method of the present invention, in an optical disk drive that records and reproduces data by irradiating a rotating optical disk with spot light, the objective lens disposed opposite to the optical disk is cleaned. In this method, when the objective lens is cleaned, a driving force exceeding a predetermined movable range is applied to the lens unit including the objective lens and a lens holder for holding the objective lens, and the lens unit is applied to the lens unit. The lens unit is made to collide with a stopper that obstructs movement beyond the movable range by contact.

  According to the present invention, the lens unit is positively made to collide with the stopper. As a result, a large acceleration can be obtained and foreign matters can be effectively removed.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an optical disc drive 10 according to an embodiment of the present invention. As is well known, the optical pickup 16 mounted on the optical disc drive 10 is provided with an objective lens (not shown in FIG. 1) that collects light from the light source. The optical disk drive 10 according to the present embodiment has a special configuration in order to effectively remove foreign matters attached to the objective lens. Hereinafter, the optical disk drive 10 will be described in detail.

  An optical disc 100 such as a CD or DVD is transported from the outside of the drive to the inside of the drive by a transport mechanism (not shown). The optical disk 100 transported into the apparatus is rotationally driven by a spindle motor (SP) 12. The spindle motor 12 is driven by an SP driver 14, and the SP driver 14 is servo-controlled by a servo processor 30 so that a desired rotation speed is obtained.

  The optical pickup 16 receives a reflected light from a laser diode (LD) that functions as a light source, an objective lens that condenses the laser light from the laser diode, an actuator 56 that drives the objective lens, and the optical disc 100 and converts it into an electrical signal. A photo detector to be converted is included, and is disposed opposite to the optical disc 100. The optical pickup 16 is driven in the radial direction of the optical disc 100 by a thread motor (SLD) 18, and the thread motor 18 is driven by an SLD driver 20. The SLD driver 20 is servo-controlled by the servo processor 30 in the same manner as the SP driver 14. The laser diode of the optical pickup 16 is driven by an LD driver 22, and the LD driver 22 is controlled by an auto power control circuit (APC) 24 so that the drive current becomes a desired value. The APC 24 and the LD driver 22 control the light emission amount of the laser diode according to a command from the system controller 32. In the figure, the LD driver 22 is provided separately from the optical pickup 16, but the LD driver 22 may be mounted on the optical pickup 16. The objective lens is driven in the horizontal direction and the vertical direction by the actuator 56. The actuator 56 functions as a drive mechanism for driving a lens unit including an objective lens and a lens holder, and is driven by an ACT driver 25 that is servo-controlled by the servo processor 30 so as to obtain a desired drive amount. .

  When reproducing the data recorded on the optical disc 100, a laser beam of reproduction power is irradiated from the laser diode of the optical pickup 16, and the reflected light is converted into an electric signal by a photodetector and output. A reproduction signal from the optical pickup 16 is supplied to the RF circuit 26. The RF circuit 26 generates a focus error signal and a tracking error signal from the reproduction signal and supplies them to the servo processor 30. The servo processor 30 functions as a control unit that controls driving of an actuator or the like. The servo processor 30 servo-controls the optical pickup 16 based on these error signals, and maintains the optical pickup 16 in an on-focus state and an on-track state. Further, the RF circuit 26 supplies an address signal included in the reproduction signal to the address decoding circuit 28. The address decoding circuit 28 demodulates the address data of the optical disc 100 from the address signal and supplies it to the servo processor 30 and the system controller 32.

  When recording data on the optical disc 100, data to be recorded from the host device is supplied to the encode / decode circuit 36 via the interface I / F 40. The encode / decode circuit 36 stores data to be recorded in the buffer memory 38, encodes the data to be recorded, and supplies the data to the write strategy circuit 42 as modulated data. The write strategy circuit 42 converts the modulation data into a multi-pulse (pulse train) according to a predetermined recording strategy, and supplies it to the LD driver 22 as recording data. Since the recording strategy affects recording quality, optimization is performed prior to data recording. That is, test data is test-written by changing the recording strategy in a predetermined test area of the optical disc 100, and the test data that has been test-written is reproduced and its signal quality is evaluated. Then, the optimum recording strategy is selected based on the evaluation result. The laser light power-modulated by the recording data is irradiated from the LD of the optical pickup 16 and the data is recorded on the optical disc 100. After recording the data, the optical pickup 16 reproduces the recorded data by irradiating a laser beam with a reproduction power, and supplies it to the RF circuit 26. The RF circuit 26 supplies the reproduction signal to the binarization circuit 34, and the binarized data is supplied to the encode / decode circuit 36. The encode / decode circuit 36 decodes the modulated data and collates it with recorded data stored in the buffer memory 38. The result of the verification is supplied to the system controller 32. The system controller 32 determines whether to continue recording data or execute a replacement process according to the result of verification.

  The system controller 32 is a part that controls the operation of the entire system. In particular, the system controller 32 of this embodiment determines whether or not the objective lens needs to be cleaned, and instructs the servo processor 30 or the like to execute a cleaning operation described in detail below when it is determined that cleaning is necessary. Here, whether or not the objective lens needs to be cleaned can be determined based on whether or not the value of a parameter related to the data recording / reproducing quality, such as the frequency of occurrence of reading errors, exceeds a predetermined threshold. it can. As another form, the necessity of cleaning may be determined based on whether or not the elapsed time from the previous cleaning operation execution or the number of exchanged optical disks exceeds a predetermined threshold. Furthermore, when the execution of the cleaning operation is instructed by the user, it may be determined that the cleaning operation is necessary.

  Next, the objective lens cleaning operation performed in this embodiment will be described in detail. First, the configuration around the optical pickup 16 used in the present embodiment, particularly the objective lens will be described. FIG. 2 is a perspective view of the optical pickup 16. FIG. 3 is a schematic configuration diagram in which only the periphery of the objective lens 50 is taken out.

  As illustrated in FIG. 3, the objective lens 50 is housed and held in a lens holder 52. The lens unit 54 including the objective lens 50 and the lens holder 52 is moved in the focus direction and the tracking direction by the drive coil 58 of the actuator 56. As shown in FIG. 2, the lens unit 54 and the actuator 56 are usually covered with a frame 60 made of resin or the like. However, in order to allow irradiation of laser light for data recording and reproduction, an opening is always provided above the objective lens 50, and the upper surface of the objective lens 50 is exposed to the outside. For this reason, foreign matters such as dust are likely to adhere to the upper surface of the objective lens 50. In particular, foreign matter is often attached to the optical disc 100 stored outside the optical disc drive 10, but the foreign matter dropped from the optical disc 100 may adhere to and accumulate on the upper surface of the objective lens 50. Such adhesion / deposition of foreign matter on the objective lens 50 has led to a decrease in quality of data recording / reproduction.

  Therefore, in the present embodiment, if necessary, an impact is applied to the lens unit 54 so that foreign matter adhering to the lens unit 54 can be lifted, and thereby the objective lens 50 is cleaned. . Specifically, when a cleaning instruction for the objective lens 50 is received from the system controller 32, the servo processor 30 drives the actuator 56 to cause the lens unit 54 to collide with the stopper 62 as shown in FIG. That is, normally, the optical pickup 16 has a stopper that restricts the movement of the lens unit 54 by contacting a part of the lens unit 54 (usually the lens holder 52) in order to restrict excessive movement of the lens unit 54. 62 is provided (in the illustrated example of FIG. 4, the frame 60 functions as the stopper 62). In general, the servo processor 30 performs drive control so as to avoid collision of the lens unit 54 with the stopper 62 as much as possible.

  In this embodiment, when the objective lens 50 is cleaned, a driving force exceeding the movable range is applied to the lens unit 54 so that the lens unit 54 collides with the stopper 62 positively. By colliding in this way, a large acceleration can be generated in the lens unit 54, and the foreign matter on the objective lens 50 can be lifted up more effectively.

  That is, the acceleration that can be generated by a general pickup actuator 56 is said to be around 7G. When the movable range of the lens unit 54 is set to 800 μm and acceleration is performed at 7 G, a speed of 0.33 m / s is obtained after 4.83 ms. When the lens unit 54 collides with the rigid body (stopper 62) at this speed, it is considered that a collision acceleration of about 6000 G can be obtained, although it depends on the material that is contacted at the time of the collision. That is, when the lens unit 54 is caused to collide with the stopper 62, an acceleration (6000G) that is significantly larger than the acceleration (around 7G) obtained only by the actuator 56 is obtained.

  However, if the acceleration obtained at the time of the collision is too large, the lens unit 54 or the like is damaged. On the other hand, if the acceleration at the time of collision is too small, a sufficient foreign matter removing effect cannot be obtained. Therefore, in order to adjust the acceleration at the time of collision to a size suitable for removing foreign matter, in this embodiment, at least one of the stopper 62 and the lens unit 54 is provided with an acceleration adjusting member 64 that adjusts the acceleration at the time of collision. The acceleration adjusting member 64 is a plate-like, film-like, or sheet-like member attached to a collision site (a site where the lens unit 54 and the stopper 62 come into contact with the collision), and the material and thickness thereof are required. It is determined according to the acceleration at the time of collision. Specifically, the acceleration at the time of collision decreases as the rigidity of the acceleration adjusting member 64 is poor, and the acceleration at the time of collision tends to increase as the rigidity increases. Therefore, when it is desired to improve the acceleration at the time of collision, it is desirable to use a relatively high-rigidity sheet-like member or the like embedded with a rigid material such as metal as the acceleration adjusting member 64. On the other hand, when it is desired to reduce the load on the lens unit 54 even if the acceleration at the time of collision is somewhat reduced, a relatively low-rigidity sheet-like member made of hard rubber or a resin material is used as the acceleration adjusting member 64. May be used. In any case, by using the acceleration adjusting member 64, a desired acceleration at the time of collision can be obtained regardless of the material of the lens unit 54 and the stopper 62. As a result, a high effect can be obtained for the cleaning of the objective lens 50.

  In FIG. 4, the frame 60 that covers the lens unit 54 is used as the stopper 62. However, if the movable range of the lens unit 54 can be regulated by contacting the lens unit 54, another member is used as the stopper 62. It may be used as For example, as shown in FIG. 5, a magnetic circuit configuration yoke 66 may be used as the stopper 62. In addition to the frame 60 and the yoke 66, a member dedicated to the stopper 62 may be provided.

  Conventionally, the objective lens 50 accommodated in the lens holder 52 is fixed to the lens holder 52 with an adhesive. That is, in the conventional lens holder 52, as shown in FIG. 9, a small diameter portion 50b on the lower side of the objective lens 50 is inserted into a through hole 52a formed substantially at the center of the lens holder 52. The large-diameter portion 50a on the upper side of the objective lens 50 was placed on the upper surface. Then, an adhesive 79 is applied to a boundary portion between the large diameter portion 50 a and the lens holder 52, and the objective lens 50 is fixed to the lens holder 52. However, in such a conventional fixing method, the adhesive 79 may be peeled off due to an impact received at the time of collision, and the objective lens 50 may fall off the lens holder 52.

Therefore, in the present embodiment, the concave portion and the convex portion that are engaged with each other are formed in the lens holder 52 and the objective lens 50 so as to inhibit the drop of the objective lens 50. Various modes are conceivable as the form of the concave part and the convex part. For example, the form shown in FIG. 6 may be adopted. FIG. 6 is a schematic perspective view of the objective lens 50 and the lens holder 52. In the center of the lens holder 52, a through hole 52a into which the small diameter portion 50b of the objective lens 50 is inserted is formed. The inner surface of the through-hole 52a has a plurality of substantially L-shaped recesses 82 in a front view including a longitudinal groove 82a extending in the axial direction and a lateral groove 82b extending in the circumferential direction from the lower end of the longitudinal groove 82a. It is formed at intervals. On the other hand, a plurality of convex portions (projection pins) 80 corresponding to the plurality of concave portions 82 are formed at equal intervals on the small diameter portion 50 b of the objective lens 50. Then, after the objective lens 50 is inserted into the through hole 52a so that the convex part 80 falls along the vertical groove 82a of the concave part 82, the objective part 50 is moved so as to move along the horizontal groove 82b of the concave part 82. The lens 50 is rotated. Thereby, even if the objective lens 50 tries to move in the axial direction, the convex portion 80.
Comes into contact with the upper surface of the lateral groove 82b and the movement is restricted, so that the objective lens 50 is effectively prevented from falling off. Of course, it is desirable that the objective lens 50 is fixed to the lens holder 52 with an adhesive or the like after the objective lens 50 is engaged with the lens holder 52.

  In addition, the above-described configuration is an example, and other configurations may be used as long as an engagement relationship that restricts dropping (movement in the axial direction) of the objective lens 50 is obtained. For example, a concave portion may be formed on the objective lens 50 side, and a convex portion corresponding to the concave portion may be formed on the lens holder 52. Further, the shape of the recess 82 may be a spiral shape as shown in FIG. 7A or an inclined line shape instead of the substantially L-shape. Further, as shown in FIG. 7B, a circumferential groove 82c extending in the circumferential direction and a longitudinal groove 82d communicating with the circumferential groove 82c are formed on the inner surface of the through hole 52a, and the small diameter of the objective lens 50 is formed. You may attach the objective lens 50 to the lens holder 52 so that the convex part 80 which protrudes from the part 50b may be accommodated in the circumferential groove 82c.

In this embodiment, in order to obtain a higher cleaning effect, the lens unit 54 is caused to collide and the lens unit 54 is also vibrated. That is, when the lens unit 54 is moved so as to collide, the servo processor 30 drives the actuator 56 to cause the lens unit 54 to vibrate in the focus direction and the tracking direction. For this vibration, it is desirable to use an integral multiple n * f ₀ (n = 1, 2,..., I) of the resonance frequency f _{0 with} the highest drive sensitivity of the actuator 56. The vibration frequency may be different between the focus direction and the tracking direction. For example, the vibration frequency in the focus direction may be f ₀ and the vibration frequency in the tracking direction may be 2f ₀ . By adding vibration to the lens unit 54 in this way, the detachability of foreign matters from the objective lens 50 is improved, and a higher cleaning effect is obtained.

  By the way, when the lens unit 54 is made to collide with the stopper 62, the foreign material adhering to the objective lens 50 rises up. However, if the objective lens 50 has not moved greatly from the soaring position before the foreign matter that has risen again falls, the fallen foreign matter may adhere to the upper surface of the objective lens 50 again. There is. Therefore, in the present embodiment, in order to prevent foreign matters that have risen from the objective lens 50 due to a collision from adhering to the objective lens 50 again, at least one of the raised foreign matters or the objective lens 50 is at least focused. Separation means is provided for moving in a direction perpendicular to the direction and separating the two.

  For example, the sled motor 18 corresponds to the separation means. That is, in this embodiment, when the lens unit 54 collides with the stopper 62, sled movement is also performed to move the optical pickup 16 in the disk radial direction. By moving the sled, the objective lens 50 can be separated from the position where the foreign matter that has risen up due to the collision is dropped, and the possibility of the reattachment of the raised foreign matter to the objective lens 50 can be reduced. Further, it is possible to move the foreign matter that has been swung up by the air flow generated during the movement of the sled. As a result, the cleaning performance can be further improved.

  A spindle motor that rotates the optical disk can also function as a separating means. That is, in the present embodiment, when the lens unit 54 collides with the stopper 62, the spindle motor 12 is driven to rotate the optical disc 100. By the rotation of the optical disc 100, an air flow is generated on the surface of the optical disc 100. The air flow blows away (moves) foreign matter that has risen in the collision, and is easily separated from the objective lens 50. As a result, the possibility of foreign matter reattaching to the objective lens 50 is reduced, and the cleaning performance can be further improved.

  Next, the effect of this embodiment will be described. FIG. 8 is a table showing experimental results for verifying the foreign matter removal effect by the collision. In this experiment, the effect of removing foreign matter was confirmed using the RF signal amplitude of the CD-ROM as an evaluation criterion. Specifically, before the foreign matter adheres to the objective lens 50 (initial state), after the foreign matter is attached, after the foreign matter is attached, the lens unit 54 is vibrated, after the foreign matter is attached, the lens unit 54 is vibrated and collides with the stopper 62. In this case, the RF signal amplitude is measured and compared. Here, sandpaper # 150 abrasive powder is used as the foreign matter, and the vibration frequency when the lens unit 54 is vibrated is 100 Hz. Further, the recovery rate is calculated based on an equation of (measurement value of RF signal amplitude) / (measurement value of RF signal amplitude in the initial state) × 100%. And the experiment on the same conditions is performed twice, and the average value in these two experiments is written in the right end in FIG. In any case, sled movement and rotation of the optical disc 100 are omitted.

  As is clear from FIG. 8, the RF amplitude is reduced to 70% or less of the initial state by installing the foreign matter. When the lens unit 54 is vibrated in this state, the RF amplitude recovers to about 82% of the initial state. Therefore, it can be presumed that there is some foreign matter removal effect only by vibration. Assume that a collision with the stopper 62 of the lens unit 54 is further executed in this state. In this case, as shown in FIG. 8, the RF amplitude recovers to around 95% of the initial state. That is, it can be seen that foreign matter that is difficult to remove simply by vibrating the lens unit 54 can be removed by applying an impact to the lens unit 54, and high cleaning performance is obtained.

  As is clear from the above description, according to the present embodiment, the cleaning performance of the objective lens 50 can be improved as compared with the conventional case. The configuration described above is an example, and when the objective lens 50 needs to be cleaned, the other configuration may be changed as long as the lens unit 54 collides with the stopper 62. Therefore, for example, the vibration of the lens unit 54, the movement of the sled, the rotation of the optical disc 100, etc. may be omitted. Further, the number of collisions of the lens unit 54 with the stopper 62 is not particularly limited, but is desirably adjusted according to the degree of foreign matter removal. For example, the greater the frequency of occurrence of read errors, the greater the number of collisions. Also, each time a collision occurs for a specified number of times (for example, 5 times), a parameter indicating the reproduction quality (for example, an RF amplitude value) is remeasured until the difference between the measured value and the previous measured value is below a certain level. You may make it repeat a collision.

It is a block diagram of the optical disk drive which is embodiment of this invention. It is a perspective view of an optical pickup. It is a perspective view of the lens unit periphery. It is a figure which shows a motion of the lens unit at the time of lens cleaning. It is a figure which shows the other example of a lens unit and a stopper. It is a disassembled perspective view of a lens unit. It is a disassembled perspective view of another lens unit. It is a table | surface which shows the experimental result which verified the foreign material removal effect by a collision. It is an exploded sectional view of a conventional lens unit, and an assembly sectional view.

Explanation of symbols

  10 optical disk drive, 12 spindle motor, 16 optical pickup, 18 thread motor, 26 RF circuit, 28 address decoding circuit, 30 servo processor, 32 system controller, 34 binarization circuit, 36 encoding / decoding circuit, 38 buffer memory, 42 Write strategy circuit, 50 objective lens, 52 lens holder, 54 lens unit, 56 actuator, 58 drive coil, 62 stopper, 64 acceleration adjusting member, 79 adhesive, 80 convex portion, 82 concave portion, 100 optical disc.

Claims (9)

An optical disc drive that performs at least one of data recording and reproduction by irradiating a rotating optical disc with spot light,
A light source that emits light for recording or reproducing data;
An objective lens that collects the light emitted from the light source, and a lens unit that includes a lens holder that holds the objective lens;
A driving mechanism for driving the lens unit in a tracking direction and a focusing direction;
A stopper that regulates the movable range of the lens unit, and a stopper that inhibits movement beyond the movable range by contacting at least a part of the lens unit that is about to move beyond the movable range;
Control means for controlling the operation of the drive mechanism, and control means for controlling the drive mechanism to cause the lens unit to collide with the stopper at the time of lens cleaning for removing foreign matter adhering to the surface of the objective lens;
An optical disc drive comprising: The optical disk drive according to claim 1,
At least one of the stopper and the lens unit is provided with an acceleration adjusting member whose rigidity is adjusted to adjust the acceleration of the lens unit caused by the collision. An optical disc drive characterized by that. The optical disk drive according to claim 1, further comprising:
At the time of the lens cleaning, the lens unit and at least one of the foreign matters that have risen due to the collision are moved at least in a direction perpendicular to the focus direction, thereby including a separating unit that separates the lens unit and the raised foreign matters from each other. An optical disc drive characterized by The optical disk drive according to claim 3,
The separation means includes a sled moving mechanism that moves the optical pickup unitized with the light source, the lens unit, and the driving mechanism in the radial direction of the optical disc,
The control means controls the driving mechanism to cause the lens unit to collide with the stopper during the lens cleaning, and controls the sled mechanism to move the optical pickup in a radial direction.
An optical disc drive characterized by that. The optical disk drive according to claim 3 or 4,
The separation means includes a disk rotation mechanism for rotating the optical disk,
The control means controls the drive mechanism to cause the lens unit to collide with the stopper during the lens cleaning, and controls the disc rotation mechanism to rotate the optical disc to remove foreign matters that have risen due to the collision. Moved by the airflow generated by the rotation,
An optical disc drive characterized by that. An optical disc drive according to any one of claims 1 to 5,
The optical disk drive characterized in that the control means further controls the drive mechanism to vibrate the lens unit during the lens cleaning. The optical disc drive according to claim 6,
The optical disk drive characterized in that the frequency of the vibration is an integral multiple of the resonance frequency. The optical disk drive according to any one of claims 1 to 7,
A concave portion is formed on one of the objective lens and the lens holder,
On the other side of the objective lens and the lens holder, a convex portion that prevents the objective lens from being detached from the lens holder by engaging with the concave portion is formed.
An optical disc drive characterized by that. In an optical disk drive that performs at least one of data recording and reproduction by irradiating spot light onto a rotationally driven optical disk, a cleaning method for an objective lens disposed opposite to the optical disk,
When cleaning the objective lens, a driving range exceeding a predetermined movable range is added to the lens unit including the objective lens and a lens holder for holding the objective lens, and the movable range is brought into contact with the lens unit. A method for cleaning an objective lens, wherein the lens unit is caused to collide with a stopper that inhibits excessive movement.

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