KR100764193B1 - Device for removing foreign substance and method for removing foreign substance of a lighting pick-up - Google Patents

Abstract

A device and a method for removing impurities of an optical pickup are provided to remove the impurities from the disk by rotating the disk at the maximum speed and adjusting the position of a bobbin. A signal for removing impurities is inputted. It is checked whether a disk is mounted on a turn table. An optical pickup device is placed at the position corresponding to the outer most end of the disk. The rotation of the disk and an eddy are used to remove the impurities. The rotation of the disk is finished if the impurities are removed. If the disk is not mounted, the step returns to the mode finishing mode. When the disk is not mounted on the turn table, the state is informed. The disk is rotated at the maximum speed and the position of the bobbin is controlled, in order to remove the impurities of the disk.

Description

Device For Removing Foreign Substance and Method For Removing Foreign Substance of a Lighting Pick-up

1 is a plan view showing the internal structure of a typical disk drive.

Figure 2 is a plan view showing an optical pickup device according to the prior art.

3 is a schematic cross-sectional view taken along the line AA ′ of FIG. 2;

Figure 4 is a plan view showing the configuration of a preferred embodiment of the foreign matter removing apparatus of the optical pickup according to the present invention.

5 is a schematic cross-sectional view taken along the line B-B 'of FIG.

Figure 6 is a working state showing a state of removing the foreign matter using the foreign matter removal apparatus of the optical pickup according to the present invention.

7 is a flow chart showing a process of removing foreign matter using the foreign matter removal apparatus of the optical pickup according to the present invention.

       * Description of the symbols for the main parts of the drawings *

10: pickup frame 20: bobbin

21: lens 30: cap

40: vortex generation stage

The present invention relates to a debris removal device for optical pickup, and more particularly, to a debris removal device for optical pickup for removing debris from a lens.

A disc drive is a device that rotates a disc on a disc to record a signal on a disc's signal recording surface or to read a recorded signal. Such disc drives are called compact disc players, DVD disc players, and the like, depending on the type and function of the disc.

Optical pickup devices provided in the disc drive are commonly used because they are necessary to record or read signals on a compact disc or DVD disc. Therefore, in the following description of the present invention and the prior art, reference to a compact disc player is to be understood as an example of the disc drive.

1 shows a configuration of a compact disc player according to the prior art.

As shown, the main base 1 forms the skeleton of the compact disc player. In the center of the main base (1) is formed a substantially rectangular through hole and the pickup is provided with a pickup base (2).

The rear end of the pickup base 2 is supported by the dustproof port 2a on the main base 1. The dustproof opening 2a is formed of a material having elasticity, and supports the pickup base 2 to the main base 1 and blocks transmission of vibration and noise between them.

The pickup base 2 is provided with a drive motor (not shown) for rotating a compact disc (not shown). The drive motor may be configured as a spindle motor and provides a driving force to rotate the disk seated on the upper surface. The top of the drive motor is provided with a turntable (not shown) is the disk is seated and rotated by the rotation of the drive motor. On the pickup base 2, an optical pickup device 3 is installed to guide along the guide shaft 7. This optical pickup device 3 has a pickup frame 4, a bobbin 5 and a cap 6 as shown in FIG.

The pickup frame 4 serves as a body of the optical pickup device 3. That is, both ends of the pickup frame 4 is connected to the guide shaft 7 and the bobbin 5 and the cap 6 are installed at the upper end.

The bobbin 5 is provided with a lens (5a) at the top to focus the light from the light source on the disk. The bobbin 5 is provided with a focusing coil (not shown) and a tracking coil (not shown) and supported by a wire spring (not shown). Therefore, the bobbin 5 is moved by the magnetic force of the electric field and the magnet formed by providing power to the focusing coil and the tracking coil through the wire spring to adjust focusing and tracking.

The cap 6 serves to shield most of the bobbin 5 except for the lens 5a. This is to protect the bobbin (5) is a key component of the compact disc player for reading the signal of the disc. The cap 6 is thus placed on top of the bobbin 5.

The through hole 6a is formed in the center of the cap 6. The through hole 6a is for communicating the disk surface with the lens 5a mounted at the center of the bobbin 5. The through hole 6a is formed to have a predetermined distance from the lens 5a on a plane so as not to interfere with light irradiation from the lens 5a. That is, the area of the through hole 6a is relatively larger than the planar area of the lens 5a.

On the other hand, the tray 8 (see Fig. 1) enters the inside and the outside of the player to load and unload the disc with a driving force by a loading motor (not shown). The tray 8 is provided with a rack gear (not shown) to engage with the rack driving gear portion (not shown) of the drive gear. The upper surface of the tray 8 is provided with a disk seating surface 8a on which a disk can be placed. A disc door 8b is provided at the tip of the tray 8 to selectively open and close the entrance of the player.

Reference numeral 9 is a clamp bracket, and 9a is a clamp for fixing the disk to the turntable.

In the conventional compact disc player having such a configuration, the driving force of the loading motor is transmitted by the engagement of the rack driving gear portion (not shown) of the drive gear and the rack gear (not shown) of the tray 8. The tray 8 enters and exits while sliding back and forth of the main base 1. That is, the rectangular tray 8 protrudes in front of the main base 1 to enable replacement of the disc, and enters into the main base 1 when the replacement of the disc is completed.

The disc loaded into the compact disc player is mounted on the turntable and rotated at high speed by the drive motor in a state of being fixed by the clamp 9a. At this time, the optical pickup device 3 moves along the guide shaft 7 and reads out a signal from the signal recording surface of the disk. Since the disk seated on the turntable is formed in a disk shape, in order to read the light reflected by the disk, as the optical pickup device 3 moves to a position corresponding to the outermost end of the disk, the rotational speed of the driving motor decreases. Should be. Therefore, the speed of the drive motor increases as the optical pickup device 3 approaches the center of the disk, and the speed of the drive motor decreases as it approaches the position corresponding to the outermost edge of the disk.

However, the prior art having the configuration as described above has the following problems.

That is, in the prior art, the tray 8 is driven into and out of the player through the inlet, and foreign matter such as dust is introduced into a gap formed between the outer surface of the tray 8 and the inner surface of the inlet. This foreign matter is introduced between the through hole 6a and the lens 5a and attached to the lens 5a to hinder the operation performance of the optical pickup device. Therefore, in order to prevent the adhesion of foreign matters, a separate member such as a dust cover must be used for the lens 5a, and in this case, the inflow of foreign matters cannot be completely blocked. Therefore, the foreign material of the lens 5a should be periodically cleaned, but there is a problem that a separate cleaner disc should be used to clean the foreign matter of the lens 5a.

The present invention is to solve such a conventional problem, the object of the present invention is to be able to remove the foreign matter without a separate foreign material removal member.

According to a feature of the present invention for achieving the above object, the present invention is a foreign matter in the method for removing foreign matter with a foreign matter removal device of the optical pickup comprising a disk, a turntable, a drive motor, a bobbin and a vortex generating stage, An operation signal input step of inputting a signal for removing the signal; A disk checking step of checking whether the disk is seated on the turntable when the operation signal input step is started; An alignment step of placing an optical pickup device positioned below the disk at a position corresponding to the outermost end of the disk when the disk is seated on the turntable; Foreign matter removal step of removing the foreign matter by using the vortex by the rotation and the vortex generating stage of the disk when the disk is aligned; It is configured to include a mode exit step of terminating the rotation of the disk when the foreign matter of the disk is removed.

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The disc checking step is characterized by moving to the alignment step when the disc is mounted on the turntable, and directly to the end mode step when the disc is not mounted.

The disc checking step may further include a disc not mounting notifying step of detecting when the disc is not mounted on the turntable and notifying that the disc is not mounted.

The foreign material removal step is to remove the foreign material of the lens by rotating the disk at the maximum speed.

The foreign matter removing step is further provided with a bobbin position adjusting step of removing the foreign matter of the disk by adjusting the position of the bobbin.

The bobbin position adjusting step is configured to include a bobbin proximity step of removing the foreign matter to the bobbin close to the lower surface of the disk.

The bobbin position adjusting step is configured to include a bobbin moving step of removing the foreign matter while the bobbin reciprocates in the vertical direction from the bottom of the disk.

According to the foreign matter removal apparatus of the optical pickup according to the present invention, since there is no need for a separate foreign matter removal member, the foreign material removal cost is reduced and the convenience of removing the foreign matter is increased.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the foreign matter removal apparatus and the removal method of the optical pickup according to the present invention will be described in more detail. However, the same parts as the prior art use the reference numerals of the prior art.

4 to 6 show a preferred embodiment of the foreign matter removing apparatus of the optical pickup according to the present invention.

As shown, the pickup frame 10 serves as a body of the optical pickup device. That is, both ends of the pick-up frame 10 is supported to be movable on the guide shaft 7 and an actuator (not shown) provided with a bobbin 20 and a cap 30 is provided at an upper end thereof.

The lens 21 is provided at the upper end of the bobbin 20 so that the bobbin 20 condenses the light emitted from the light source on the disk D. The bobbin 20 is provided with a focusing coil (not shown) and a tracking coil (not shown). The bobbin 20 is supported on a frame (not shown) of the actuator by a wire spring (not shown). Therefore, the bobbin 20 is moved by the magnetic field of the electric field and the magnet formed by providing power to the focusing coil and the tracking coil through the wire spring (not shown) to adjust focusing and tracking. The bobbin 20 is movable up, down, left and right by focusing and tracking adjustment.

The cap 30 is provided on the outside of the bobbin 20 to protect the exterior of the bobbin 20. This is because the bobbin 20 is a key component for reading the signal of the disk D and the bobbin 20 is operated precisely in the range of several micrometers (µm).

The through hole 30a is formed in the center of the cap 30. The through hole 30a is for communicating the surface of the disk 21 with the lens 21 mounted at the center of the bobbin 20. The through hole 30a is formed to have a predetermined distance from the lens 21 on a plane so as not to interfere with light irradiation from the lens 21. That is, the surface area of the through hole 30a is relatively larger than the planar area of the lens 21.

The upper surface of the cap 30 is provided with a vortex generating stage 40 for forming a vortex. The vortex generating end 40 is formed by projecting a predetermined height upward from the upper surface of the cap 30. The vortex generation stage 40 is located long in the radial direction of the disk (D). Therefore, when the disk D located above the vortex generating stage 40 rotates, the moving direction of the air flow generated at the edge of the disk D (tangential direction of the disk) and the vortex generating stage 40 The longitudinal direction is orthogonal.

The protrusion height H of the vortex generating stage 40 is not in contact with the lower surface of the disk D positioned upward, as shown in FIG. 6, and the upper surface of the vortex generating stage 40 and the disk D. It is formed spaced at a predetermined interval so that the air flow between the lower surface of the.

The optical pickup provided with the vortex generating stage 40 is guided and installed by the guide shaft 7 provided in the pickup base 2, and the pickup base 2 is driven to rotate the disk D. A motor (not shown) is installed. The turntable (not shown) is rotated by the rotation of the drive motor (not shown), and the disk (D) is seated on the top surface of the turntable.

In addition, a light source (not shown) for irradiating light is provided inside the pickup base 2, and the light irradiated by the light source (not shown) is provided through the lens 21 of the bobbin 20. The bottom surface of D) is irradiated. The light irradiated on the lower surface of the disk D is reflected again and sent back through the lens 21 of the bobbin 20 to a photodetector (not shown) provided in the bobbin 20 to read a signal. Used.

Hereinafter, the operation of the foreign matter removing apparatus of the optical pickup according to the present invention having the configuration as described above will be described in detail.

First, as shown in FIG. 7, an operation signal input step is performed in which an operation signal is input to remove foreign substances at a desired time or at a predetermined time. When the operation signal input step is started, light generated by a light source (not shown) provided in the pickup base 2 is irradiated to the lower surface of the disk D. In this case, when the disk D is not seated on the top of the turntable, light is not reflected and no light is detected by the photodetector (not shown). Therefore, it may be checked whether the disk D is seated on the top of the turntable. Can be.

If the disk D is seated on an upper surface of the turntable, the next step is carried out. However, if the disk D is not seated, the disk non-installation inspection step of moving to the mode termination step to be described below is executed. In the disk non-installation inspection step, when the disk D is not seated on the upper surface of the turntable, the operation moves to the end mode so that no further operation is performed. Therefore, foreign matters are not removed unless the disk D is seated on the upper surface of the turntable. At this time, a disk not attached notification step indicating that the disk D is not mounted may be added.

If the disk D is seated on the upper surface of the turntable, an alignment step of aligning the lens 21 of the bobbin 20 at a position corresponding to the outermost end of the disk D is performed. When the alignment step is performed, the pickup frame 10 provided with the bobbin 20 moves along the guide shaft 7. In this case, the pickup frame 10 is adjusted such that the lens 21 of the bobbin 20 is positioned at a position corresponding to the outermost end of the disk D positioned above the lens 21.

When the lens 21 of the bobbin 20 is positioned at a position corresponding to the outermost end of the disk D, a foreign matter removing step of removing the foreign matter is performed. When the foreign matter removing step is executed, the turntable on which the disk D is mounted is rotated at the maximum speed by a driving motor (not shown). Originally, when the turntable is located at a position corresponding to the outermost end of the disk D, in order to read the light reflected by the disk D, the speed of the driving motor should be reduced, but to maximize the effect of removing foreign substances. The drive motor rotates at the maximum speed. The disk D seated on the upper surface of the turntable by the rotation of the drive motor (not shown) also rotates at the maximum speed. When the disk D rotates at a high speed, airflow is generated in the upper and lower portions of the disk D in a direction orthogonal to the radial direction of the disk D.

The airflow generated below the disk D reaches the vortex generating stage 40 provided on the upper surface of the cap 30 while moving in the rotational direction. This airflow is moved through the space between the upper surface of the vortex generating stage 40 and the lower surface of the disk D while impeding movement by hitting the vortex generating stage 40. At this time, the airflow passing between the vortex generating stage 40 and the disk D is bent downward and rotates, thereby causing vortices.

As shown in FIG. 5, the vortex generated by the vortex generating stage 40 strikes an upper surface of the lens 21 provided in the bobbin 20, thereby causing foreign substances attached to the lens 21 to be removed. It serves to remove. In addition, the lens 21 is located below the outermost end of the disk (D), the maximum speed of the air flow generated by the disk (D) is maximized the effect of removing foreign matter by the vortex.

In addition, the bobbin position adjustment step for improving the foreign matter removal effect while the disk (D) is rotated is provided. The bobbin position adjusting step may be configured as a bobbin proximity step or bobbin moving step. The bobbin proximity step is a step in which the bobbin 20 positioned below the disk D is close to the lower surface of the disk D such that the lens 21 provided on the upper surface of the bobbin 20 is effective in removing foreign substances. Since the lens 21 is located close to the lower side of the disk D, the vortex generated by the disk D effectively reaches the surface of the lens 21.

In addition, the bobbin position adjusting step may be configured as a bobbin moving step for removing the foreign matter on the surface of the lens 21 evenly. In the bobbin moving step, the bobbin 20 is repeatedly moved in the vertical direction by a focusing operation. Therefore, the vortex is brought into contact with various parts of the lens 21 provided on the upper surface by the vertical movement of the bobbin 20, and the foreign matter attached to the lens 21 is evenly removed. The bobbin proximity step and the bobbin moving step may be selectively performed.

When the foreign substance removal mode is performed for a predetermined time, a mode ending step of terminating the foreign substance removal is executed. In the mode termination step, the rotation of the driving motor is stopped, thereby removing all foreign matters from the disc (D).

Within the scope of the basic technical idea of the present invention, many modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. will be.

According to the foreign material removal structure and the removal method according to the present invention as described in detail above, the following effects can be obtained.

Since the foreign matter is removed by using the airflow generated by the rotation of the disk, there is no need for a separate removal member, thereby reducing the cost of removing the foreign matter and increasing convenience of removing the foreign matter.

Claims (11)

delete delete delete delete delete delete delete Claims [1] A method for removing a foreign substance by a foreign matter removing apparatus of an optical pickup including a disk, a turntable, a driving motor, a bobbin and a vortex generating stage, the method comprising: an operation signal input step of inputting a signal for removing the foreign substance; A disk checking step of checking whether the disk is seated on the turntable when the operation signal input step is started; An alignment step of placing an optical pickup device positioned below the disk at a position corresponding to the outermost end of the disk when the disk is seated on the turntable; Foreign matter removal step of removing the foreign matter by using the vortex by the rotation and the vortex generating stage of the disk when the disk is aligned; It is configured to include a mode exit step of terminating the rotation of the disk when the foreign matter of the disk is removed, The disk test step, If the disk is mounted on the turntable, the process moves to the alignment step, and if the disk is not mounted, the process moves directly to the end mode. And detecting a disc not mounted on the turntable to notify the user that the disc is not mounted. The foreign material removal step, The foreign material removal method of the optical pickup, characterized in that to remove the foreign material of the lens by rotating the disk at the maximum speed. The method of claim 8, wherein the foreign material removing step, The foreign matter removal method of the optical pickup, characterized in that the bobbin position adjusting step for removing the foreign matter of the disk by adjusting the position of the bobbin is further provided. The method of claim 9, wherein the bobbin position adjusting step, The bobbin is a foreign matter removal method of the optical pickup, characterized in that it comprises a bobbin proximity step of removing the foreign matter in close proximity to the lower surface of the disk. The method of claim 9, wherein the bobbin position adjusting step, And a bobbin moving step of removing the foreign matter while the bobbin reciprocates in the vertical direction from the bottom of the disk.

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