JP2008097724A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device in which dust and dirt attached to an objective lens can be raked out by that a cleaning part of a cleaning disk contacts to a whole plane of the objective lens uniformly. <P>SOLUTION: In the optical device in which an objective lens 24 of an optical pickup 20 protected by a protector 36 preventing contact to a media disk 14 is cleaned by attaching the cleaning disk having a cleaning brush, the protector 36 forms a path for guiding the cleaning brush and contacting it to the objective lens 24, the protector 36 is a columnar member of a columnar shape or a square pillar shape, makes the path of which the minimum width is a diameter of the objective lens 24 for the cleaning direction at the surrounding of the objective lens 24. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus that cleans an optical pickup lens (objective lens) with a cleaning disc.

Optical discs and magneto-optical discs used for recording and reproducing information are used in audio equipment, video equipment, personal computers, and the like. As a digital music medium, a compact disk (CD) and a mini disk (MD) which is a magneto-optical disk for a digital small recording / reproducing device are used, and as a video medium, a digital video disk (DVD) is used. . In addition, a CD or the like is used as a recording medium for a computer. In recent years, a CD-R / RW or the like capable of writing information has also been used.
Furthermore, as a next-generation optical disc standard for DVD, a Blu-ray disc (BD) is attracting attention.

Recording and reproduction of these media is performed by an optical optical pickup provided in the disk drive. The disk drive rotates the media disk mounted on the turntable by a spindle motor, and the optical pickup moves in the radial direction with respect to the media disk to record and reproduce information.
In such an optical pickup, laser light emitted from a laser transmitter is condensed by a lens and applied to a recording surface of a media disk, and the reflected light is captured by an optical sensor.

Dust adhering to the objective lens of the optical pickup is removed by a cleaning disk to which a cleaning member is attached. There are three types of cleaning discs: wet, dry and non-contact, where the cleaning liquid is applied to the brush as a contact type. Wet and dry types wipe the objective lens with the brush, and exhaust gases and smoke in the air. Remove dust and dirt on the objective lens.
The non-contact type is an air flow generated by the rotation of the disc, and blows away dust adhering to the objective lens.
In such a cleaning disk, the objective lens can be cleaned by implanting a brush in a position of a management information area that is always accessed when identifying the medium on the innermost periphery of the disk.

By the way, in order to realize a high density of the media disk, it is indispensable to make the spot diameter of the laser light small, for example, a blue-violet semiconductor laser and a high numerical aperture objective lens are adopted in the BD. . The larger the numerical aperture is, the shorter the distance (working distance) between the objective lens and the media disk becomes. When the focusing of the optical pickup malfunctions due to impact or vibration, the objective lens and the media disk may come into contact with each other.
Therefore, in recent high-density recording / reproducing apparatuses, as shown in FIGS. 13 and 14, a cylindrical protector 3 is provided around the objective lens 2 of the optical pickup 1 to prevent contact with the media disk. I have to.
13 is a top view and a partially sectional side view showing a conventional optical pickup, and FIG. 14 is a partially sectional perspective view showing an optical disk cleaning in a conventional optical disk apparatus.
Moreover, in FIG. 14, the code | symbol 5 shows the cleaning brush which is a cleaning part, and the arrow shows the cleaning direction of the cleaning brush 5 planted by the cleaning disk 4. FIG.

There are the following proposals as an optical pickup device or an optical disk device provided with this type of objective lens cleaning mechanism.
In the example shown in Patent Document 1, in an optical pickup provided with a ring-shaped protector around the objective lens, an airflow is introduced by providing a blower port and an air exhaust port in the ring-shaped protector protruding from the lens holder. This prevents dust from adhering to the objective lens.
Moreover, in the example shown in Patent Document 2, by forming a circular or arc-shaped groove on the outer peripheral front end surface of the protector provided in the objective lens holder of the optical pickup device, dirt attached to the protector and the information recording medium is formed in the groove. It is made to flow and trap to prevent dirt from adhering to the objective lens.
Utility Model Registration No. 3085343 JP 2004-326855 A

However, in the conventional Patent Documents 1 and 2, it is not sufficient even if dust can be removed due to the structure, and it is difficult to remove dirt such as oil smoke or oil mist, and there is room for improvement.
As shown in FIG. 14, in the protector 3 for disc contact prevention of the optical pickup 1, for example, the brush of the cleaning brush 5 implanted in the arc shape of the cleaning disc 4 advances to the lens surface (in the direction of the arrow in FIG. 14). ), Which is hindered by the protector 3 and is difficult to come into contact with the surface of the objective lens 2 and it is difficult to remove dirt. In particular, in the optical pickup of the BD drive, the protector of the objective lens has a cylindrical shape, and the progress of the brush of the cleaning disk is obstructed by the protector, so that it is difficult to contact the objective lens.

  The present invention has been made in view of such circumstances, and an object of the present invention is to form a passage through which the contact prevention portion of the objective lens guides the cleaning portion of the cleaning disk to contact the objective lens. By providing the configuration, an object of the present invention is to provide an optical disc apparatus in which the cleaning part of the cleaning disk can uniformly contact the entire surface of the objective lens and scrape dust and dirt attached to the objective lens.

  Another object of the present invention is to provide a cleaning disk having a configuration in which the cleaning portion of the cleaning disk is guided at least by the passage width of the diameter of the objective lens by the passage formed by the gap of the contact prevention portion of the columnar member. It is an object of the present invention to provide an optical disc apparatus in which the cleaning unit uniformly contacts the entire surface of the objective lens and scrapes dust and dirt adhering to the objective lens.

  Still another object of the present invention is to provide a configuration in which the passage through which the cleaning unit passes is arranged so as to be narrow in the rotation direction of the cleaning disk, so that the cleaning unit of the cleaning disk is in contact with the objective lens. It is an object of the present invention to provide an optical disc apparatus that can easily enter a passage formed by a prevention portion and can smoothly collect a cleaning portion of a cleaning disc on an objective lens.

  Another object of the present invention is that the contact prevention portion of the objective lens is formed of two table-like members that are formed long in the rotation direction of the cleaning disk with the objective lens in between, and has an angle of attack with respect to the cleaning portion. It is an object of the present invention to provide an optical disc apparatus that can smoothly collect the cleaning portion of the cleaning disc on the objective lens and can be brought into contact with the entire surface of the objective lens without any unevenness.

  Another object of the present invention is that the contact prevention portion of the objective lens is a trapezoidal member having a substantially trapezoidal cross section with the objective lens in between and the inclined surface facing the objective lens. By having a structure that is arranged so as to be narrower with respect to the rotation direction of the cleaning disk, the cleaning part is guided smoothly by the narrow slope of the contact prevention part with the objective lens in between. It is an object of the present invention to provide an optical disc apparatus that can perform the above-described process.

  Another object of the present invention is such that the contact prevention portion of the objective lens is provided with a substantially V-shaped guide portion for guiding the cleaning portion at the entrance of the passage into which the cleaning portion of the cleaning disk enters. Accordingly, an object of the present invention is to provide an optical disc apparatus that can smoothly collect the cleaning portion of the cleaning disc on the objective lens and can wipe the entire surface of the objective lens with high density without unevenness.

  The optical disk apparatus according to the present invention is the optical disk apparatus in which the objective lens of the optical pickup protected by the contact prevention unit that prevents contact with the optical disk is cleaned by the cleaning unit of the cleaning disk in the rotation direction of the cleaning disk. The portion is disposed so as to form a passage that guides the cleaning portion and makes contact with the objective lens.

  In the optical disc apparatus of the present invention having such a configuration, the contact prevention unit guides the cleaning unit of the cleaning disc to the objective lens, and the cleaning unit uniformly contacts the entire surface of the objective lens and scrapes dust and dirt attached to the objective lens. .

  In the optical disk apparatus of the present invention, the contact prevention unit is a columnar member, and is disposed around the objective lens so as to form the passage having the smallest diameter of the objective lens. It is characterized by.

  In the optical disc apparatus of the present invention having such a configuration, the cleaning portion of the cleaning disc is guided at least by the passage width of the diameter of the objective lens by the passage formed by the gap of the contact prevention portion, and the cleaning portion contacts the entire surface of the objective lens evenly. Then, dust and dirt adhering to the objective lens are scraped out.

  In the optical disk device of the present invention, the contact preventing portion is disposed so that the passage is narrow in the rotation direction.

  In the optical disc apparatus of the present invention having such a configuration, the cleaning portion of the cleaning disc easily enters the passage formed by the contact prevention portion, and the cleaning portion is smoothly collected on the objective lens.

  In the optical disk device of the present invention, the contact prevention unit is provided with the objective lens in between, and is two table-like members formed long in the rotation direction, and has an angle of attack with respect to the cleaning unit. It is arrange | positioned so that it may have.

  In the optical disk apparatus of the present invention having such a configuration, the cleaning unit smoothly gathers on the objective lens and uniformly contacts the entire surface of the objective lens.

  In the optical disk apparatus of the present invention, the contact prevention unit is a trapezoidal member having a substantially trapezoidal cross section parallel to the two cleaning disks with the objective lens in between and the inclined surface facing the objective lens side. The slopes of the trapezoidal member having a substantially trapezoidal cross section are arranged so as to be narrower in the rotation direction.

  In the optical disc apparatus of the present invention having such a configuration, the cleaning unit is smoothly guided by the slope of the contact prevention unit facing the objective lens, and the cleaning unit uniformly contacts the entire surface of the objective lens.

  The optical disk apparatus of the present invention is characterized in that the contact preventing part is provided with a substantially V-shaped guide part for guiding the cleaning part at an entrance of the passage into which the cleaning part enters.

  In the optical disk apparatus of the present invention having such a configuration, the substantially V-shaped guide part invites the cleaning part, and the cleaning part gathers in the objective lens with high density and wipes the entire surface of the objective lens evenly.

In the optical disk apparatus of the present invention, the contact prevention unit forms a passage that guides the cleaning unit and contacts the objective lens, so that the cleaning unit uniformly contacts the entire surface of the objective lens and scrapes dust and dirt attached to the objective lens. It has the effect of being able to.
Therefore, the optical disk apparatus of the present invention eliminates an obstruction factor for condensing laser light, and can prevent the occurrence of a recording / reproducing error.

  In the optical disk apparatus of the present invention, the cleaning unit guides the cleaning unit with at least the path width of the diameter of the objective lens by the passage formed by the gap of the contact prevention unit of the columnar member, so that the cleaning unit uniformly contacts the entire surface of the objective lens. Thus, the dust and dirt adhering to the objective lens can be scraped off.

  In the optical disk apparatus of the present invention, the passage through which the cleaning section passes is arranged so as to be narrow in the rotation direction of the cleaning disk, so that the cleaning section can easily enter the path formed by the contact prevention section and cleaning is performed. This has the effect that the portions can be smoothly collected on the objective lens.

  In the optical disk apparatus of the present invention, the contact prevention unit is two table-like members formed long with the objective lens in between, and is disposed so as to have an angle of attack with respect to the cleaning unit. It has the effect that it can be smoothly collected on the objective lens and can be brought into uniform contact with the entire surface of the objective lens.

  In the optical disk apparatus of the present invention, the contact prevention unit is a trapezoidal member having a substantially trapezoidal cross section with the objective lens in between and the inclined surface facing the objective lens, and each inclined surface has a width with respect to the rotation direction. Since it is arranged so as to be narrow, the cleaning part can be guided smoothly by the narrow slope of the contact prevention part with the objective lens in between, and it can be in contact with the entire objective lens evenly Has the effect of being able to.

  In the optical disk apparatus of the present invention, the contact prevention part is provided with a substantially V-shaped guide part that guides the cleaning part at the entrance of the cleaning part. In addition to being able to collect on the lens, the entire surface of the objective lens is wiped at a high density without unevenness, so that there is an effect that the cleaning can be performed more uniformly.

In the present invention, a protector of an optical pickup lens (objective lens) of an optical disc recording / reproducing apparatus is provided with a passage through which a cleaning member of a cleaning disc passes, and information on an information storage medium such as a CD, DVD, or BD is stored. It can be applied to a recording / reproducing apparatus.
Hereinafter, preferred embodiments of an optical disc apparatus according to the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a partially transparent schematic perspective view showing an optical disc apparatus including a protector according to the present embodiment.
The optical disc apparatus according to the present embodiment includes a turntable 16 on which a media disc 14 that is an optical disc is mounted, a spindle motor 18 that rotates the turntable 16, and data recorded on the media disc 14. The optical pickup 20 is provided on a carriage 22 (pedestal) that can reciprocate, and irradiates the recording surface of the media disk 14 with laser light from the objective lens 24 (optical pickup lens). However, the information on the media disk 14 is recorded and reproduced by moving in the radial direction.
The carriage 22 is configured such that the carriage controller 48 drives the servo motor 44 by the movement control of the controller 42 (see FIG. 3 above), and the carriage 22 reciprocates by rotating the screw shaft 25.

The optical pickup 20 includes an actuator unit 26 that performs focusing control for matching the focal point of the objective lens 24 with the surface of the media disk 14 and tracking control for matching the focus of the objective lens 24 on the track of the media disk 14.
The actuator unit 26 includes a pickup base 28, a lens holder 30 elastically suspended on the pickup base 28 by four holding wires 27 and 29, and a permanent magnet provided on the pickup base 28 so as to face the lens holder 30. 32, and each of the two holding wires 27 and 29 is fixed at a joint portion 34 on the side portion of the lens holder 30.

Around the side portion of the lens holder 30, a drive coil wound in the vertical direction and a drive coil wound in the horizontal direction are embedded (not shown), and one pair of holding wires 27 (upward in FIG. 1). ) And the other pair of holding wires 29 (located below in FIG. 1) and the embedded drive coils.
Therefore, the lens holder 30 moves in the vertical direction (focusing) by receiving a magnetic force in the magnetic field of the permanent magnet 32 by energizing the holding wire 27 and the drive coil wound in the lateral direction. By energizing the drive coil wound in the vertical direction, the lens holder 30 moves in the left-right direction (rotation direction with respect to the optical axis of the objective lens 24) by receiving the magnetic force in the magnetic field of the permanent magnet 32. (Tracking), it is possible to move.

FIG. 2 is a perspective view showing the lens holder according to the present embodiment.
The lens holder 30 is provided in the upper part of the actuator movable part 41, the objective lens 24 provided in the center of the upper surface, and the cylindrical contact prevention parts provided around the objective lens 24 in four places in FIG. And a passage 35 through which the cleaning brush 40 planted on the cleaning disk 38 contacts and passes through the objective lens 24 is provided. A protector 36 is disposed in the passage 35 so that the width of the objective lens 24 is minimized.
The protector 36 that is a lens protective contact prevention unit is formed higher than the objective lens 24.
The cleaning brush 40 of the cleaning disk 38 is formed by implanting a brush at a position in the management information area that is always accessed when the medium is identified on the innermost periphery of the disk.

In the example shown in FIG. 2, the protectors 36 are arranged in parallel to the cleaning direction (the rotation direction of the cleaning disk 38), but are arranged obliquely and narrowly with respect to the cleaning direction (arrows in FIG. 2). It is preferable to install. That is, the brush of the cleaning brush 40 is guided by making the distance between the protectors 36 and 36 at the rear (downstream passage) narrower than the distance between the protectors 36 and 36 at the front (upstream passage) in the cleaning direction. It is preferable to arrange the protector 36 as described above.
In FIG. 2, 27 and 29 indicate holding wires for suspending the lens holder 30, and 34 indicates a joint between the holding wires 27 and 29 and the side of the actuator movable portion 41.

  In the present embodiment having such a configuration, the brush of the cleaning brush 40 implanted in the cleaning disk 38 smoothly moves in the passage 35 of the protector 36, and the brush contacts the entire surface of the objective lens 24 evenly. The dust and dirt adhering to 24 are scraped off and cleaned.

Therefore, in the present embodiment, dust, dirt, etc. attached to the objective lens 24 of the optical pickup 20 can be removed, there is no hindrance to condense the laser beam, and the information on the media disk 14 can be removed. Recording / playback errors can be prevented.
Further, since the protector 36 is arranged so as to guide the brush of the cleaning brush 40, the brush of the cleaning brush 40 is drawn onto the surface of the objective lens 24 and wiped at a high density, so that the cleaning is more uniform. Can do.

Next, a control system in the optical disc apparatus according to the present embodiment will be described.
3 and 4 are block diagrams showing a control system in the optical disc apparatus according to the present embodiment.
In FIG. 4, the cleaning brush of the cleaning disk 38 is omitted.
FIG. 3 shows a state where the actuator movable portion 41 is moved to the focus-on position by focusing control described later.

The optical disc apparatus according to the present embodiment includes a controller 42 that drives and controls a spindle motor 18, an actuator movable unit 41, and a servo motor 44 that drives the carriage 22.
The controller 42 drives and controls the spindle motor 18 that rotates the turntable 16 on which the media disk 14 is chucked and mounted by the spindle control unit 46. The carriage control unit 48 controls the servo motor 44 that places the optical pickup 20 and moves the carriage 22 back and forth through the screw shaft 25 in the radial direction of the media disk 14. Further, the focusing / tracking control unit 50 performs focusing control and tracking control of the actuator movable portion 41 of the actuator unit 26.

In the present embodiment, the actuator movable portion 41 is guided by the guide pin 52 provided on the pickup base 28, supported by the guide pin 52, and locked by focusing control (FIG. 4).
3 indicates the direction in which the actuator movable portion 41 moves to the focus on position by focusing control, and the arrow in FIG. 4 indicates the direction in which the actuator moves to the focus off position or the cleaning position.

The focus off position shown in FIG. 4 is the cleaning mode position according to the present embodiment, and the separation distance A between the objective lens 24 and the cleaning disk 38 corresponds to a working distance such as a CD or a DVD.
3 and 4, reference numeral 54 denotes a limit switch for detecting the innermost circumferential position of the carriage 22.

Next, a method for cleaning the objective lens according to the present embodiment will be described.
FIG. 5 is a flowchart of the cleaning method according to the present embodiment.
In the cleaning method according to the present embodiment, first, when the cleaning mode is designated from the menu display screen of the remote controller (step S1), the controller 42 issues a control signal to the focusing control unit, and the focusing / tracking control unit 50 includes the actuator movable unit. 41 is driven and locked to the pickup base 28 (see FIG. 4).

  Next, after displaying a disk insertion message on the menu display screen of the remote controller (step S2), when the cleaning disk 38 is mounted on the turntable 16, the controller 42 causes the optical pickup 20 to irradiate the cleaning disk 38 with laser light, Whether or not the cleaning disk 38 is inserted is determined based on whether or not the reflected laser beam is detected (step S3).

  Next, after confirming the insertion of the cleaning disk 38, the controller 42 issues a control signal, the carriage control unit 48 moves the carriage 22 toward the turntable 16, and the optical pickup 20 is in the disk management information area at the innermost peripheral position of the disk. Until it is detected (step S4).

Then, after confirming that the optical pickup 20 has detected the management information area, the controller 42 issues a control signal, and the spindle motor 18 is rotated by the spindle controller 46 (step S5). The controller 42 determines whether or not the designated cleaning time has elapsed (step S6), and when the designated time has elapsed, the spindle controller 18 stops the rotation of the spindle motor 18 (step S7).
Finally, the cleaning disk 38 is removed (step S8), and the cleaning of the objective lens 24 is completed.

  In such a cleaning method according to the present embodiment, the brush is implanted in the position of the management information area that is always accessed when the innermost media disk is identified as the cleaning disk 38, and is locked to the pickup base 28. Since the objective lens 24 of the actuator movable portion 41 is moved and cleaned, even if the cleaning brush 40 presses the objective lens 24, the actuator movable portion 41 does not swing and contacts the objective lens 24 evenly. Can be cleaned.

  The flocking position of the cleaning disk 38 in the example is in the management information area of the disk, but if it is in the data area specified by the user, the management information of the cleaning disk 38 is read and then the data specified by the user. The area is searched for cleaning, but cleaning may also be performed during focus search when reading management information.

(Embodiment 2)
Next, a second embodiment will be described.
In the second embodiment, the objective lens and the protector are disposed in the lens holder provided in the actuator movable portion of the lens drive actuator for the optical pickup. For convenience, the objective lens is provided in the actuator movable portion including the lens holder. The drawings in which the protectors are arranged will be described. The same applies to Embodiments 3 and 4 described later.

FIG. 6 is a perspective view showing a protector according to the second embodiment. FIG. 7 is a top view showing the protector according to the second embodiment.
The protectors 62 and 64 according to the second embodiment are trapezoidal members provided at symmetrical positions with the objective lens 24 disposed in the actuator movable portion 41 in between, and the cleaning direction (see FIGS. 6 and 7). A rectangular side surface 63, 65 parallel to the arrow), a rectangular surface 67, 69 having an angle of attack with respect to the cleaning direction, and a peripheral side surface 66, 68 forming a part of a cylindrical shape. Yes. That is, the cylinder is vertically divided into, for example, three parts, and the cross section on both sides, with the central part removed, is a substantially bowl-shaped member. The rectangular surfaces 67 and 69 which have are formed.
In other words, each of the protectors 62 and 64 is a trapezoidal member having a semi-elliptical cross section with one end cut obliquely.

In the protectors 62 and 64, a guide passage 70 that is narrow in width with respect to the cleaning direction is formed by rectangular surfaces 67 and 69 and rectangular side surfaces 63 and 65 parallel to the cleaning direction. The guide passage 70 is a passage having the minimum width of the objective lens 24, and is formed wider than the width of the objective lens 24 on the upstream side.
Accordingly, the protectors 62 and 64 as a whole have a substantially Y-shaped guide passage 70 for guiding the cleaning brush 40 (see FIG. 2) of the cleaning disk 38, and the guide passage into which the brush of the cleaning brush 40 enters. The entrance on the upstream side of 70 has a V-shaped guide shape (guide portion) in plan view.

With such a configuration, in the second embodiment, the brush of the cleaning brush 40 is guided to the objective lens 24 by the V-shaped guide passage 70, and the brush of the cleaning brush 40 contacts the objective lens 24 evenly.
Therefore, in the second embodiment, the brush of the cleaning brush 40 can be brought into contact with the objective lens 24 evenly, and dust and dirt attached to the objective lens 24 can be scraped and cleaned.

(Embodiment 3)
Next, a third embodiment will be described.
FIG. 8 is a perspective view showing a protector according to the third embodiment. FIG. 9 is a top view showing the protector according to the third embodiment.
The protectors 72 and 74 according to Embodiment 3 have a substantially trapezoidal cross section parallel to the cleaning disk along the cleaning direction, and are symmetrical with the objective lens 24 disposed in the actuator movable portion 41 in between. The substantially trapezoidal longitudinal outer surfaces 73 and 75 are parallel to the cleaning direction (arrows in FIGS. 8 and 9), and the upstream side of the longitudinal inner surface is relative to the cleaning direction. Slopes 76 and 78 having an angle of attack are formed, and the upstream end is rounded.

  As shown in FIG. 9, the protectors 72 and 74 are substantially guided to guide the brush of the cleaning brush 40 by the slopes 76 and 78 that are both narrow with respect to the cleaning direction and side surfaces 82 and 84 that are parallel to the cleaning direction. The guide passage 86 is a Y-shaped guide passage 86, and the guide passage 86 into which the brush of the cleaning brush 40 enters has a V-shaped guide shape on the upstream side. The guide passage 86 is formed from the edge of the actuator movable portion 41.

With this configuration, in the third embodiment, the brush of the cleaning brush 40 is guided to the objective lens 24 by the guide passage 86 having a V-shape upstream from the edge of the actuator movable portion 41, and the brush of the cleaning brush 40 is objective. Contact the lens 24 evenly.
Therefore, in the third embodiment, the brushes of the cleaning brush 40 can be collectively guided by the V-shaped guide passage 86 and can be brought into uniform contact with the objective lens 24, and dust and dirt attached to the objective lens 24 can be removed. Can be scraped and cleaned.
In the third embodiment, the cross section has a substantially trapezoidal shape. However, it is a trapezoidal member, for example, a substantially rectangular parallelepiped shape, and the pair of protectors are disposed so as to have an angle of attack along the cleaning direction as a whole. May be.

(Embodiment 4)
Next, a fourth embodiment will be described.
Embodiment 4 shows a modification of the protector.
FIG. 10 is a top view showing a protector according to the fourth embodiment. FIG. 11 is a front view of the protector according to Embodiment 4 as viewed from the cleaning direction. FIG. 12 is a top view showing various shapes of the protector.
The protector 92 is formed by rounding the downstream end portion of the protector 72 shown in the third embodiment, and is formed to extend from one end of the lens holder 30 to the other end in the cleaning direction. .
When a cylindrical protector is disposed around the objective lens 24, the protector 94 is disposed so that the upstream protector 94 has a cross-sectional shape and has an angle of attack with respect to the cleaning direction.

The protector is not only a cylindrical protector 96, but also a triangular prism (see FIG. 12 (a)), a hexagonal prism (see FIG. 12 (b)), and a rectangular column with rounded corners (FIG. 12 ( c)) and a pentagonal prism (see FIG. 12D), and may be a truncated pyramid or a truncated cone.
The protector for a columnar member of the present invention includes a cylinder, a prism, a truncated pyramid, a truncated cone, and the like, and may have a peripheral side surface and a rectangular side surface in part.
The protector disposed on the upstream side is preferably disposed so as to be narrow as a whole in the cleaning direction. Further, it is preferable that a surface having an angle of attack is formed on the upstream protector, and this surface is disposed so as to be in contact with the cleaning brush as a cleaning portion obliquely.

It is a partially transparent schematic perspective view which shows an optical disk apparatus provided with the protector which concerns on this Embodiment. It is a perspective view which shows the lens holder which concerns on this Embodiment. It is a block diagram of a control system showing a focus-on position in the optical disc apparatus according to the present embodiment. It is a block diagram of a control system showing a focus-off position in the optical disc apparatus according to the present embodiment. It is a flowchart of the cleaning method which concerns on this Embodiment. It is a perspective view which shows the protector which concerns on Embodiment 2. FIG. 6 is a top view showing a protector according to Embodiment 2. FIG. It is a perspective view which shows the protector which concerns on Embodiment 3. FIG. It is a top view which shows the protector which concerns on Embodiment 3. It is a top view which shows the protector which concerns on Embodiment 4. It is the front view seen from the cleaning direction of the protector concerning Embodiment 4. It is a top view which shows the various shapes of a protector. It is a top view and a partial cross-sectional side view showing a conventional optical pickup. It is a partial cross section perspective view which shows the optical disk cleaning in the conventional optical disk apparatus.

Explanation of symbols

14 Media disc (optical disc)
20 Optical pickup 24 Objective lens 38 Cleaning disk 40 Cleaning brush (cleaning part)
36, 94, 96 Protector (Contact prevention part, columnar member)
62, 64, 72, 74, 92 Protector (contact prevention part, base member)

Claims (6)

In the optical disc apparatus for cleaning the objective lens of the optical pickup protected by the contact prevention portion for preventing contact with the optical disc by the cleaning portion of the cleaning disc in the rotation direction of the cleaning disc.
The optical disk apparatus according to claim 1, wherein the contact prevention unit is disposed so as to form a passage for guiding the cleaning unit to contact the objective lens.   2. The contact preventing portion is a columnar member, and is disposed around the objective lens so as to form the passage having a diameter of the objective lens as a minimum passage width. An optical disk device according to the above.   The optical disc apparatus according to claim 1, wherein the contact prevention unit is disposed so that the passage is narrow in the rotation direction.   The contact prevention portion is provided with the objective lens in between, and is two table-like members formed long in the rotation direction, and disposed so as to have an angle of attack with respect to the cleaning portion. The optical disk apparatus according to claim 1, wherein the optical disk apparatus is provided. The contact prevention portion is a trapezoidal member having a substantially trapezoidal cross section parallel to the two cleaning disks with the objective lens in between and the inclined surface facing the objective lens side.
5. The optical disk device according to claim 1, wherein the slopes of the trapezoidal member having a substantially trapezoidal cross section are arranged so as to be narrower in the rotation direction.   4. The contact prevention part according to claim 1, wherein a substantially V-shaped guide part for guiding the cleaning part is provided at an entrance of the passage into which the cleaning part enters. The optical disk device described.

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