KR19990009874A - Optical disk cleaning device and method - Google Patents

Abstract

The present invention relates to an optical disk cleaning apparatus and method, and more particularly, to an optical disk cleaning apparatus and method capable of selectively performing a cleaning operation when foreign matter is detected in the optical disk.

The optical disk cleaning apparatus includes: foreign matter detection means for detecting whether foreign matter adheres to the optical disk with a light receiving amount reflected from the optical disk; And a cleaning means for cleaning the surface of the optical disc when foreign matter is detected from the substance detecting means.

Description

Optical disk cleaning device and method

1 is a flow chart of preparation for conventional optical disc reproduction.

2 is a block diagram showing an optical disk cleaning apparatus according to the present invention.

3 is a detailed structural diagram of a cleaning apparatus shown according to an embodiment of the present invention.

4 is a flowchart for an optical disk cleaning operation according to the present invention.

Explanation of symbols for main parts of the drawings

1: optical disk 3: actuator

5: Slide motor 7: High frequency converter

9: comparison unit 11: control unit

13: laser diode 15: spindle motor

17: cleaning motor 19: cleaning device

21: nonwoven fabric 23: rotating shaft

25: Cleaning kit

The present invention relates to an optical disk cleaning apparatus and method, and more particularly, to an optical disk cleaning apparatus and method capable of selectively performing a cleaning operation when foreign matter is detected in the optical disk.

Recently, information handled by individuals has been diversified into documents, audio, video, and the like, and a large capacity is naturally required as an external memory for this purpose. Therefore, the memory developed by this need is an optical disk.

Optical discs use information to record information. This optical disk can store a large amount of information because an optical spot for recording information on the recording film is 1 micron in size.

When the optical disc on which information is recorded or reproduced using such a very small optical spot is stuck with dust enough to affect recording and reproduction, accurate information reproduction or recording cannot be performed. This is because the light spots are scattered due to dust, which makes it impossible to read or write information correctly.

The above description is described in more detail with reference to the prior art.

1 is a flowchart showing the operation of recording or reproducing a conventional optical disc.

In operation, the optical disc to be recorded or reproduced is mounted in the loading apparatus (step 101), and the optical disc is clamped by using a predetermined clamping mechanism on the drive motor shaft (step 103).

Then, the spindle motor is driven to rotate the optical disc (step 105), and the slide motor is driven to move the optical pickup device for reading the signal recorded from the optical disc or recording the signal on the optical disc to the lead-in area by a certain amount ( Step 107). The optical pickup apparatus is moved to a read in area of the optical disk.

Then, for recording or reproducing the correct information, focusing control for controlling whether the spot of the optical pickup device exactly coincides with the information pit of the optical disc, and the spot of the optical pickup apparatus is used to accurately track the track where the information pit of the optical disc is located. After the tracking control for controlling whether or not the tracking is made (step 109), recording or reproducing of the information is performed.

By the above process, information is recorded or reproduced on the optical disc. At this time, the optical pickup apparatus for directly recording the information on the optical disc or reading the recorded information contacts any part of the recording / reproducing surface of the optical disc. In the absence of this information is recorded or reproduced.

In other words, in the general optical disc recording / reproducing apparatus, since the optical pickup apparatus is a non-contact type, when foreign matter such as dust adheres to the optical disc, a focusing error or the like occurs, resulting in an unstable recording / reproducing operation of the optical disc.

In order to solve the system instability at this time, foreign matters such as dust or fingerprints attached to the optical disc should be removed, and in order to remove the foreign substance, the user had to clean the optical disc himself.

In other words, the conventional optical disc recording / reproducing apparatus provides troublesome use because the user needs to manually remove foreign matters and the like, and does not know that an error is caused by foreign matters. There were also concerns that could bring a crowd.

Accordingly, an object of the present invention is to provide an apparatus and method for cleaning an optical disk, which can selectively perform a cleaning operation when foreign matter is detected from the optical disk.

An apparatus for cleaning an optical disc according to the present invention for achieving the above object comprises: foreign matter detection means for detecting whether foreign matter adheres to the optical disc with a light receiving amount reflected from the optical disc; When foreign matter is detected by the foreign matter detection means, it comprises a cleaning means for cleaning the surface of the optical disk.

According to an aspect of the present invention, there is provided a method of cleaning an optical disc, the method including: detecting a received amount of light reflected from a rotating optical disc; A second step of determining whether to perform a cleaning operation by comparing the detected amount of received light with a reference signal; If it is determined that the cleaning operation is necessary in the second step, a third step of cleaning the surface of the optical disc is included.

The apparatus and method for cleaning an optical disc according to the present invention detects whether foreign matter adhering to the optical disc is enough to affect the recording or reproducing operation of the information before the recording or reproducing operation of the information, and judges that it can affect the recording. When the cleaning device is running.

In the cleaning apparatus, an optical disk performs cleaning by cleaning means moved up and down by driving of a motor, and at this time, the cleaning means may use a nonwoven fabric.

Hereinafter, an apparatus and method for cleaning an optical disc according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a cleaning apparatus for an optical disk according to the present invention, and FIG. 3 is a detailed configuration diagram of the cleaning apparatus according to the present invention.

As shown in FIG. 2, the configuration includes an optical disk 1, a spindle motor 15 for rotating the optical disk 1, and information for reading or recording information recorded on the optical disk 1; An actuator 3 mounted with an objective lens, a slide motor 5 for driving the actuator 3, and a laser diode 13 for emitting a laser beam with an objective lens mounted on the actuator 3; It is configured by.

Then, a high frequency conversion unit 7 which receives a laser beam reflected from the objective lens of the actuator 3 and converts the laser beam into a high frequency signal, and a high frequency signal output from the high frequency conversion unit 7 are compared with a reference signal to determine the difference. It is determined whether the high frequency signal received from the comparator 9 for outputting a signal and the difference signal output from the comparator 9 is above or below a predetermined level, and controls to drive the cleaning apparatus when it is below a certain level. And a control unit 11 for generating a signal.

At this time, the reference signal of the comparison unit 9 is a signal for determining whether or not reading or recording of the correct signal is possible or impossible due to foreign matter such as dust or fingerprint attached to the optical disk.

As shown in FIG. 3, the cleaning device 19 driven under the control of the control unit 11 includes a motor 17, a rotation shaft 23 rotated together when the motor 17 is driven, and the rotation shaft. Non-woven fabric, which is one of the cleaning kit 25 that is raised in the forward rotation of the 23 and descends in the reverse rotation, and a cleaning member attached to the upper part of the cleaning kit 25 to remove foreign substances adhering to the optical disc 1. It consists of 21.

The outer circumferential surface of the upper portion of the rotary shaft 23 of the motor 17 is screwed, and the cleaning kit 25 is formed with a screw groove 27, the inner peripheral of which is screwed so that the rotary shaft 23 can be screwed have. The cleaning kit 25 is not rotated and is supported so as to be movable only in the vertical direction. It can be seen that the cleaning device 19 as described above is configured such that the cleaning kit 25 having the nonwoven fabric 21 attached to the upper end of the cleaning device 19 is movable in the vertical direction. However, the present invention is not limited to this configuration, and it is, of course, possible to use other mechanical elements capable of converting the rotary motion into linear reciprocating motion using the rotational force of the motor.

Next, a cleaning method of the optical disk cleaning apparatus according to the present invention will be described.

4 is a flowchart showing a cleaning operation of an optical disk according to the present invention.

The optical disk 1 to be recorded or reproduced is mounted on the rotating shaft of the spindle motor 15 and loaded (step 201), and the optical disk 1 is clamped using a constant clamping mechanism on the rotating shaft of the spindle motor 15. (Step 203). Then, the spindle motor 15 is driven to rotate the optical disc 1 (step 205).

When the optical disc 1 is seated in the above-described process, the actuator 3 equipped with the objective lens for reading the signal recorded from the optical disc 1 or recording the signal on the optical disc 1 is mounted on the optical disc 1. In order to move near the read-in area, the controller 11 outputs a drive signal to the slide motor 5 (step 207).

When the movement operation is performed to the lead-in area of the actuator 3 in the step 207, the control unit 11 drives the laser diode 13 to emit the laser beam. The laser beam is reflected from the objective lens mounted on the actuator 3 by the beam emitted from the laser diode 13, so that the high frequency converter 7 receives the laser beam reflected from the objective lens. Step 209).

The laser beam received by the high frequency converter 7 is converted into a high frequency signal, and the converted high frequency signal is output to the comparator 9. At this time, the comparison unit 9 compares whether the received amount of light received by the high frequency conversion unit 7 is smaller than the reference signal, and outputs the signal according to the comparison to the control unit 11.

When the light receiving amount is smaller than the reference signal by the comparison signal of the comparing unit 9, the control unit 11 is accompanied by a warning indicating that a large amount of foreign matter is attached to the optical disc 1 on the display (not shown) (step 213). When the cleaning device 19 is being driven, the actuator 3 is in the lead-in area of the optical disc 1, and the driving of the slide motor 5 is then performed. A temporary stop is made.

The cleaning device 19 inputs a control signal from the controller 11 drives the motor 17 to rotate the rotary shaft 23, and the rotary shaft 23 is screwed in accordance with the rotation of the rotary shaft 23. The cleaning kit 29 having the threaded groove 27 therein is lifted up. That is, the cleaning kit 29 is supported to move only in the up and down direction in a state in which rotation is impossible, so that the cleaning kit 29 is moved upward by the screw groove 27 engaged therewith by the rotation of the rotation shaft 23. Done. When the cleaning kit 25 is raised, the surface of the optical disc 1 and the nonwoven fabric 21 of the cleaning kit 25 come into contact with each other to perform the cleaning operation of the optical disc, and the optical disc 1 is rotated by the rotating optical disc 1. ) Is cleaned as a whole.

After the cleaning operation is performed in the above process, the control unit 11 rotates the motor 17 in the reverse direction to lower the cleaning kit 29 (step 215).

Then, the lead-in area detection of the actuator 3 is performed as an introduction step for entering the program area of the optical disc 1 (step 217).

After performing step 217, in order to record or reproduce accurate information, a focusing control for controlling whether the spot of the objective lens mounted on the actuator 3 exactly matches the information pit of the optical disc 1 and the spot of the objective lens are performed. Tracking control is performed to control whether the track on which the information pit of the optical disc 1 is located is accurately tracked (step 219).

Then, the actuator 3 is moved from the lead-in area to the program area, and information recording or information reproducing operation is performed.

As described above, the apparatus and method for cleaning an optical disc according to the present invention has an effect of more accurately reproducing and recording information by removing foreign matters such as dust or fingerprints from the optical disc.

In addition, the apparatus and method for cleaning an optical disk according to the present invention can detect the amount of light received by the optical disk to determine whether the recording or reproduction of information can be influenced, and then selectively perform the cleaning operation only when necessary for cleaning. There is an advantage in that the time required for more unnecessary cleaning operation can be suppressed and the degree of contamination of the nonwoven fabric of the cleaning apparatus can be minimized.

Claims (6)

Foreign matter detection means for detecting whether foreign matter is stuck to the optical disc with a light receiving amount reflected from the optical disc; And cleaning means for cleaning the surface of the optical disc when foreign matter is detected from the foreign matter detection means. The method of claim 1, The foreign material detecting means includes a high frequency conversion unit for detecting the amount of received light reflected from the optical disk; A comparator for comparing a high frequency signal output from the high frequency converter with a reference signal; And a control unit for driving the cleaning transfer means by an output signal of the comparison unit. The method according to claim 1 or 2, The cleaning means includes a cleaning member for cleaning the surface of the optical disk; And a cleaning transfer means for transferring the cleaning member into contact or non-contact with the optical disc. The method of claim 3, wherein The cleaning transfer means includes a motor; And a cleaning kit in which shanghai is formed by forward and reverse rotation of the motor. The method of claim 4, wherein The cleaning member is an optical disk cleaning apparatus, characterized in that using a nonwoven fabric. A first step of detecting the amount of received light reflected from the rotating optical disk; A second step of determining whether to perform a cleaning operation by comparing the detected amount of received light with a reference signal; And a third step of cleaning the surface of the optical disc if it is determined that the cleaning operation is necessary in the second step.