KR100299244B1 - Method and device for testing quality of optical disc medium - Google Patents

Abstract

PURPOSE: A quality testing device for an optical disc and a method thereof are provided to test all the manufactured disc quality by automatically loading the optical disc and performing the test to a predetermined area during a short time, thereby improving the reliability. CONSTITUTION: A quality testing device for an optical disc includes a recording/reproducing element for recording/reproducing test data with respect to a predetermined area of the disc, a storing element for storing source test data recorded to the disc by the recording/reproducing element, and a disc quality determination element for comparing a signal reproduced from the recording/reproducing element with a signal stored in the storing element for determining the quality of the disc according to the comparison result.

Description

Quality inspection method and device of optical disc

The present invention relates to a quality inspection method and apparatus for an optical disc, and more particularly, to a quality inspection method and apparatus for inspecting a quality of all manufactured optical discs and providing reliability of a product.

Until now, recording media include magnetic recording tapes, laser discs or compact discs as optical discs, and digital video discs that have been recently produced with a large capacity for storing information.

Among these recording media, optical discs use digital recording method that is different from conventional magnetic recording method, and because they have very small volume and weight, they are very efficient for storage and movement. Is very high.

However, in any product, the manufactured product should be able to be used without any defects, and if problems with the quality of the product occur, it will reduce the trust of the producer who produced the product.

The same holds true for optical discs. In particular, optical discs with very fine signal characteristics have resulted in poor quality due to scratches, mold defects, fingerprints, and foreign matter adhered during the manufacturing process.

The optical disc thus manufactured is then subjected to quality inspection as a next step and then shipped to the optical disc market. Therefore, the present invention will be described for the quality inspection process performed after the optical disk is manufactured.

In the conventional optical disc quality inspection, a visual inspection and a reflectance inspection method are used. The visual inspection method among the conventional optical disc quality inspection methods will be described briefly.

As shown in Fig. 1, the quality inspection of a conventional optical disc generally allows the quality of the optical disc to be inspected by four measuring drives.

First, on the assumption that the characteristics of the optical discs manufactured from the same apparatus are the same, the producer selects an arbitrary optical disc from all the manufactured optical discs and mounts it to the measurement system 24. Then, data is recorded on the mounted optical disc using an optical recording device (not shown) included in the measurement system 24.

In general, an optical disc can be divided into a lead-in area, a program area, and a lead-out area, and data directly used by users is recorded in the program area. Therefore, the recording of data using the optical recording device included in the measurement system 24 is to record in the program area of the disc.

After data is recorded in the program area of the mounted optical disc, the first measurement drive 26 measures high frequency signals and jitter by signals reproduced from the optical disc. The measured high frequency signal (HF signal) and jitter are transmitted to the display unit 10 under the control of the system 24.

The first digital signal processor 14 of the display unit 10 displays the high frequency signal and jitter measured by the first measurement drive 26 so as to be viewed by the inspector after performing predetermined signal processing.

In addition, the second measurement drive 28 measures servo signals (focusing error signals and tracking error signals) based on signals reproduced from the optical disc mounted in the system 24, and the measured servo signals are stored in the system 24. Is input to the second digital signal processor 16 under the control of. The second digital signal processor 16 performs a predetermined signal processing on the servo signal input from the measurement system 24, and then displays the servo signal for viewing by the inspector.

Similarly, the third measuring drive 30 detects the mechanical characteristics of the optical disc during the quality inspection, and the fourth measuring drive 32 detects the optical characteristics of the optical disc. The mechanical characteristic detected in the third measurement drive 30 is signal processed in the third digital signal processor 18, and the optical characteristic detected in the fourth measurement drive 32 is signaled in the fourth digital signal processor 20. It is processed and displayed on the display unit 10.

The central processing unit 12 of the display unit 10, which is not described, controls signal processing of the first to fourth digital signal processors through data transmission and reception with the main computer 22 and the measurement system 24. In addition, the main computer 22 is responsible for controlling the operation of all the devices described so far.

As described above, the conventional optical disc quality inspection focuses a laser beam on the optical disc to record data, and then measures the signal reflected from the optical disc to determine whether the information is recorded correctly and the manufacturing state of the optical disc.

Thus, the start of lead-in from the optical disc, the start of the program area, the start of lead-out, the start of track and index, the speed of inspection, the track pitch (TRP), Bowed Deflection (DFL), Warp Deflection ( WAV), optical disk thickness, Angular Deflection, Vertical Deviation, optical disk radius, center hole diameter, etc. The quality of the optical disc is checked by checking a tracking signal such as a / pull), a data carrier analog, a data carrier digital, and the like.

However, the conventional optical disc quality inspection method has a problem in that it is impossible to fully inspect the manufactured optical disc. This means that in the optical disc on which the quality inspection is performed, data for quality inspection is directly recorded in the program area in which user data is recorded. Therefore, in the case of optical discs that record data once, such as CD-R and DVD-R, they have to be discarded after being sampled. Therefore, it is impossible to select a sufficient amount of optical discs for sampling inspection. do.

As described above, the conventional optical disc quality inspection method has a loss in manufacturing cost as much as the discarded disc due to the sampling test, and due to the inability to perform a full inspection of the manufactured optical disc, there is a problem in that the reliability of the product is inferior. In addition, the conventional optical disc quality inspection method has exposed problems in various aspects, such as the limitation of visual test, installation cost of equipment, and long tack time in the manufacturing process.

Therefore, in the present invention, the sampling test of the manufactured optical disk is converted to full inspection, and the product quality is not lost even if the test data and the like are recorded and reproduced on the disk. In addition, the present invention is to reduce the tack time in the optical disk manufacturing process, increase the reliability and eventually reduce the manufacturing cost.

Accordingly, an object of the present invention is to provide a method and apparatus for quality inspection of an optical disk capable of performing a full inspection of the manufactured optical disk.

Another object of the present invention is to provide an optical disc quality inspection method and apparatus which can reduce the manufacturing cost of the optical disc while increasing the reliability of the product.

1 is a block diagram showing a conventional optical disc quality inspection apparatus.

2 is a mechanical configuration diagram of an optical disk quality inspection apparatus according to the present invention.

3 is an overall system configuration of an optical disk quality inspection apparatus according to the present invention.

4 is a block diagram showing an internal configuration of an optical disc quality inspection apparatus according to the present invention.

5 is a structural diagram of an optical disk according to the present invention.

6 is a flowchart showing a process of optical disc quality inspection according to the present invention;

7 is a flowchart showing an optical disc quality inspection process according to another embodiment of the present invention.

8 is a flowchart showing an optical disc quality inspection process according to another embodiment of the present invention.

9 is an exemplary configuration diagram for sucking a disk of a mobile pickup.

10 is an exemplary configuration diagram for the shanghai dong of the mobile pickup.

11 is an exemplary configuration for the rotational movement of the mobile pickup.

<Description of the symbols for the main parts of the drawings>

40: drive 44: circular axis

46: moving pickup 48, 50, 52: spindle

60: optical disk 62: spindle motor

64: slide motor 66: loading motor

68: display unit 70: pickup device

72: laser diode drive 74: write control logic

76: high frequency amplifier 78: DSP

80: servo processor 82: microprocessor

84: memory 86: comparator

88: buffer 90: interface

92 carrier 94 interface

According to an aspect of the present invention, there is provided a method for inspecting a quality of an optical disc, the method including: searching for a specific area of the disc; Recording test data in a specific area of the disc; Reproducing data recorded in the specific area; And comparing the reproduction data with the reference data to determine the quality of the disc.

According to an aspect of the present invention, a quality inspection apparatus for an optical disc includes: recording / reproducing means for recording / reproducing test data in a specific area of the disc; Storage means for storing source test data recorded on the disc by the recording / reproducing means; And disc quality discriminating means for discriminating the quality of the disc by comparing the reproduced signal reproduced from the recording / reproducing means with the signal stored in the storing means.

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

First, since the present invention performs quality inspection for discriminating good and bad discs from a plurality of manufactured optical discs, it will soon be carried to the quality inspection apparatus of a plurality of molded optical discs.

And optical discs will be manufactured by a conventional manufacturing process. For example, a polycarbonate is supplied, a PC drying process, a melting and injection process, a molding process by a mold are performed, a process of coding a formed recording film, a cleaning process, and a recording film drying process are performed on the recording film. All processes are complete. When the protective film coding process is performed to protect the recording film on which data is recorded, a desired optical disc is manufactured.

The optical disk thus manufactured will be stacked on the spindle 48 and transferred to the quality inspection apparatus of the present invention.

2 is an exemplary configuration diagram of a compact disc recordable inspection apparatus (CDIA) according to the present invention. The illustrated embodiment is one embodiment for the mobile pickup 46 which is movably installed between the plurality of drives 40 and the respective spindles 48, 50, 52 for quality inspection of the optical disc as described below. Yes.

As shown in Fig. 2, the optical disc quality inspection apparatus according to the present invention records data in a predetermined area of the mounted optical disc in order to inspect the quality of the optical disc manufactured by a conventional manufacturing process, and the optical disc on which the data is recorded. And a plurality of drives 40 for reproducing data from the data disc and checking the quality of the optical disc.

The optical disc quality inspection apparatus includes a first spindle 48 having a plurality of optical discs manufactured by a conventional manufacturing process, and a second spindle 50 for stacking good quality discs after quality inspection is performed by the drive 40. And a third spindle 52 for stacking bad disks after quality inspection is performed by the drive 40.

That is, the optical disc quality inspection device should have at least one input spindle and at least two output spindles. The input spindle is a spindle for stacking disks for which quality inspection has not been performed after manufacture, and the output spindle is for stacking good or defective spindles after inspection from an optical disk quality inspection apparatus.

In addition, the optical disk quality inspection apparatus of the present invention by holding the optical disk at the top of the optical disk stacked on the first spindle 48, mounted on the drive 40, or after the quality inspection in the drive 40 The good quality disc includes a moving pickup 46 which moves to the second spindle 50 and the bad disc moves to the third spindle 52.

Accordingly, the movable pickup 46 is installed to be movable between the drive 40 and the spindle. As shown in FIG. 2, the movable pickup 46 is rotatable in the center between the drive 40 and the spindles 48, 50, and 52. It is mounted on the circular shaft 44, and the movable pickup 46 is mounted to be movable up and down on the circular shaft 44.

The moving pickup 46 itself is for moving a disk stacked on the spindle while moving between the plurality of spindles 48, 50, 52 and the plurality of drives 40. Therefore, the mobile pickup 46 is provided with a device that can hold the spindles one by one. Such an apparatus can be configured in various ways, but first, a sucking method will be described. As shown in FIG. 9, which shows a grip operation of the disk by adsorption, the grip of the disk by adsorption is a suction hole 46a on the lower side (surface in contact with the disk) of the mobile pickup 46. And the suction hole 46a is connected to, for example, the vacuum pump P by the tubular member 46b. Therefore, as the vacuum pump P operates, the suction force for sucking the disk is exerted through the suction hole 46b connected to the tubular member 46b, so that the disk adheres to the mobile pickup 46 one by one. Done.

In this way, the mobile pick-up 46, which holds a single disc, is moved between the spindles 48, 50, 52 and the drive 40 through the shank movement and rotation operations described later. And after the movement is completed, when the operation of the vacuum pump (P) is stopped, the suction force for sucking the disk is released, the disk will be seated in a predetermined position of the spindle or drive.

However, the configuration of the mobile pickup 46 is not limited to this configuration. That is, it is sufficient if it is possible to pick up the discs one by one and move them to a desired position. For example, it is possible to implement a device that can hold the disk, consisting of a plurality of arms, as well as a plurality of articulated arms and a hydraulic or pneumatic device that can perform the joint motion of the arm Of course, it can be realized by using.

Next, as described above, the movable pickup 46 is configured to allow the circular shaft 44 to move up and down by a predetermined interval. This configuration will be described based on FIG. 10.

The shank moving device of the movable pickup 46 includes a worm 44a rotatably installed inside the circular shaft 44 and a movable pickup 46 formed to engage the teeth of the outer circumferential surface of the worm 44a. It is comprised including the tooth | gear part 46c. On the outer circumferential surface of the worm 44a, teeth are formed, and since the teeth 46c are engaged with the teeth of the worm 44a, the vertical movement is substantially performed in accordance with the rotation of the worm 44a. . At this time, the moving pickup 46 is to be guided so as to be able to move only in the vertical direction by the circular shaft 44, of course. The worm 44a is rotated by a motor M capable of forward and reverse rotation. On the lower surface of the mobile pickup 46, a touch sensor 46s is provided.

The configuration example shown in FIG. 10 is only one configuration example for configuring the mobile pickup 46 to be movable up and down. Substantially, the configuration for moving the mobile pickup 46 up and down may have many other modifications. For example, the mobile pickup 46 may be installed in a rack, and the pinion for driving the rack may be connected to a motor capable of controlling the rotation speed. By rotating the pinion, the rack can move the pick-up 46 up and down while moving up and down.

As another modification, the belt driving method is also possible. It is meant that the endless belt is installed over the inside of the circular shaft 44 and a mobile pickup is attached to the middle portion of the endless belt. In the case of the belt driving method, by transmitting the rotational power by the motor to the drive pulley, it will be possible to enable the vertical movement of the mobile pickup.

Next, the rotational motion of the mobile pickup 46 will be described with reference to FIG. 11, which is an exemplary view of the configuration of the rotational motion of the mobile pickup. The rotational movement of the movable pick-up 46 is performed by a substantially circular shaft 44. The circular shaft 44 is rotatably supported by the main shaft 44s on the main body supporting surface 49 of the apparatus according to the present invention. The central shaft 44s is configured to transmit rotational power by the driving motor M1 through the transmission gear 46. Therefore, when the driving motor M1 is driven, the central shaft 44s is rotated by power transmission by the transmission gear 45. At this time, the control of the rotation angle of the circular shaft 44 is sufficiently controllable by controlling the rotation speed of the drive motor M1. That is, the rotation angle of the mobile pickup 46 is controlled by controlling the rotation speed of the drive motor M1 by a rotation speed sensing device, for example, an encoder, which senses the rotation speed of the drive motor M1. Position control for the plurality of spindles 48, 50, 52 and position control for the plurality of drives 40 can be performed.

The embodiment shown in FIG. 11 is merely an exemplary configuration for enabling the rotational movement of the mobile pickup 44 by rotating the circular shaft 44, but is not limited thereto. For example, it is of course possible to configure the drive motor which can control the rotation speed so that a power can be directly transmitted to the outer peripheral surface of the circular shaft 44. As another configuration example, it may be possible to rotate the circular shaft 44 while controlling the rotation angle by connecting power between the rotating shaft 44s and the drive motor through the belt drive.

Next, the operation related to the vertical motion and the rotational motion of the above-mentioned mobile pickup will be described briefly. First, when the motor M is driven, the mobile pickup 46 moves upward or downward. Taking the case of moving to the lower side and holding the disk as an example, when the movable pick-up 46 moves to the lower side and reaches a disk stacked on the spindles 48, 50 and 52, the touch sensor 46s It is recognized that the state of contact with the disk by the detection signal in the). Then, the vacuum pump P operates to generate suction force for sucking the disk in the suction hole 46a, and the disk closely adheres to the mobile pickup 46 by the suction force. In this state, the movable pickup 46 moves upward or rotates through the rotational movement of the circular shaft 44, and then downward again toward the selected drive. Such vertical motion and rotational motion are as described above. When the disk is seated in the selected drive, the driving of the vacuum pump is stopped, the disk is seated at the selected position, and a process for testing as described below will be performed. In addition, the process of removing the tested disk from the drive 40 and stacking it on one spindle 50 or 52 may be performed in the reverse order as described above.

The optical disc quality inspection apparatus of the present invention includes a controller 41 for controlling the operation of the mobile pickup 46 and the drive 40. That is, the controller 41 has a function of controlling the operation of the optical disc quality inspection apparatus CDIA as a whole.

In the optical disk quality inspection apparatus according to the present invention having such a configuration, one optical disk is moved from the plurality of optical disks stacked on the first spindle 48 under the control of the controller 41 to the drive 40 by the movable pickup 46. Is moved.

And an optical pickup device (not shown) included in the drive 40 that is mounted in the drive 40 and searched as a characteristic track of Absolute Time Information in Pregroove (ATIP) suitable for the data format (STP; Standard Test Program) of the present invention. After recording, the STP data is recorded using the optical pickup apparatus.

The data is reproduced again from the optical disc on which the STP data is recorded, and the discrepancy of the disc is judged by comparing the reproduction signal with the reference STP data stored in the memory to determine whether the reproduction is normally performed.

The disc determined to be a bad disc in the drive 40 is moved by the mobile pickup 46 under the control of the control 41 and moved to the third spindle 52 which stacks the bad disc. Similarly, the disc determined as the good disc in the drive 40 is moved by the mobile pickup 46 under the control of the controller 41 and moved to the second spindle 50 for stacking the good discs.

After determining whether the optical disk manufactured by the drive 40 is good or bad, the bad disk will be discarded, and the good disk is moved and shipped to the market after the printing process of the surface of the disk is performed.

The following describes the process of determining whether the disc is good or defective by recording the test data on the manufactured disc, and then reproducing it.

3 shows an entire system of an optical disc quality inspection apparatus according to the present invention.

A compact disc recordable inspection technology (CDIT) of an optical disc connects a quality inspection apparatus (CDIA) and an external computer 95 by SCSI. The external computer 95 transmits test data to the quality inspecting apparatus or receives test data reproduced by the quality inspecting apparatus via SCSI to determine whether the mounted disk is good or bad. It is possible. And the user can control the operation of the quality inspection device (CDIA) through the external computer (95).

Further, the user can arbitrarily adjust the reference value for discriminating whether it is good or bad in the disc discrimination operation. Therefore, when the external computer 95 determines the good or bad of the disc, the user-specified reference value will be set in the external computer, and if the quality of the disc is performed in the controller 41 of the CDIA, The reference value specified by the above will be input from the external computer 95 and set to the controller 41 via SCSI.

The reference value set in this way is usually determined by how many error signals are detected, and when included in the range, it will be determined as a good quality disc. However, when the number of error signals is out of the set range, the disk is determined to be defective. Therefore, the smaller the number of errors set as the reference value, the higher the reliability according to the quality of the disk, and the higher the number of errors set as the reference value, the lower the reliability of the quality of the disk.

4 is a block diagram of the internal structure of the optical disc quality inspection apparatus according to the present invention.

The drive for performing an optical disc quality inspection of the present invention includes an optical disc 60, a mobile pickup 46 for moving the optical disc 60 from the first spindle 48 into the drive 40, and the mobile pickup 46. Data is recorded on or recorded on the carrier 92, which is an upper, lower, left and right conveying means of the upper and lower carriers, the spindle motor 62 which rotates the mounted optical disk 60, and the mounted optical disk 60. A pickup device 70 for reading out, a slide motor 64 for moving the pickup device 70 from the inner circumference to the outer circumference or the outer circumference to the inner circumference of the optical disc 60, and a loading motor 66 for loading operation of the system. It includes.

Accordingly, the slide motor 64, the spindle motor 62, and the loading motor 66 are configured to control the operation of the motors 62 and 64 by receiving a command from the microprocessor 82 that controls the drive as a whole. It is under the control of the servo processor 80.

In addition, the optical disc quality inspection apparatus of the present invention inputs a high frequency amplifier 76 for amplifying a reproduction signal read from the pickup device 70 by a predetermined amount, and an output signal from the high frequency amplifier 76 to demodulate and correct errors. And a digital signal processor 78 for performing digital signal processing.

The interface 90, which has received test data from the controller 41 for writing test data for recording in a predetermined region of the mounted optical disc 60, transmits the input data to the write control logic 74, and the write control logic 74. Drives the laser diode drive 72 based on the input data. The laser light emitted from the laser diode drive 72 is recorded in a predetermined area of the optical disc 60 through the pickup device 70.

In addition, the interface 90 encodes or decodes data inputted through data transmission / reception with the high frequency amplifier 76, the digital signal processor 78, and the microprocessor 82 to convert data between the controller 41 and the peripheral device. Control transmission and reception. The buffer 88 temporarily stores data input and output to the interface 90.

The microprocessor 82 controls the servo processor 80 according to the ATIP spindle servo control signal applied from the interface 90, and at the same time receives the reproduction signal processed by the digital signal from the digital signal processor 78 to store the memory ( The reference data and the reproduction signal stored at 84 are transmitted to the comparator 86 to control the comparison operation between the two signals. Of course, the memory 84 may use a memory means built in the microprocessor 82, and likewise, the performing of the comparator 86 may also be performed in the microprocessor 82.

After the signal comparison in the microprocessor 82 or the comparator 86, it is determined whether the mounted optical disc is good or bad, and the display according to the determination can be displayed on the display unit 68.

In addition, the optical disk quality inspection apparatus of the present invention is equipped with a plurality of drives 40 having the above-described configuration, and the mobile pickup 46 for moving the disk between the drive 40 and the spindles 48, 50, 52. ) Is attached. Therefore, it includes a controller 41 for controlling the operation of the plurality of drives 40, the operation of the mobile pickup 46 and the overall operation of the optical disk quality inspection apparatus.

The controller 41 may perform a quality inspection determination operation on the disk performed by the microprocessor 82. Therefore, when the user wants to perform the quality check determination operation of the disc in the microprocessor 82 in the drive 41 itself, the user sets a reference value for the quality check of the disc in the microprocessor 82 and at the same time, the operation accordingly. If the controller 41 wants to perform the disc quality check determination operation, the microprocessor 82 performs only the control operation in the drive 40 itself and performs the disc determination operation. .

Next will be described in detail the process of inspecting the quality of the optical disk mounted in the optical disk quality inspection apparatus according to the present invention.

First, the area of the disc for recording test data will be described with reference to FIG. 5 prior to the description of the process of checking the quality of the optical disc.

An optical disc is roughly divided into a lead-in area, a program area, and a lead-out area. In the lead-in area, data such as a start point of a normal program area is recorded. The program area is an area in which user data is recorded. Therefore, in order to inspect the quality of the optical disc according to the present invention, an area in which test data is recorded becomes a lead out area.

The area of the optical disc shown in FIG. 5 shows the lead out area in which test data is recorded in order to check the quality of the optical disc according to the present invention.

In other words, the lead-out area of the optical disc according to the present invention starts from the point where the program area ends (about 75 minutes 30 seconds 00 block point). In the lead-out area of the optical disc, some spare tracks are provided as points for finding the position of the optical pickup device until the block point of about 75 minutes 32 seconds. Typically, the portion is referred to as a damper area, preferably about 6.5 tracks.

Next to the damper area is a STPA (Standard Test Program Area) area in which STP data according to the present invention is recorded. The STPA area occupies up to about 75 minutes and 42 seconds. The number of tracks in the STPA area is preferably about 32.4 tracks. However, it is not necessary to always fix the area (track number) in which the STP data is recorded. In general, the tact time in the CD-R manufacturing process is preferably determined in about 5 to 12 seconds. It is therefore possible for the user to set the tack time as needed between 5 and 12 seconds.

Of course, the number of tracks on which STP data is recorded will vary according to the adjustment of the tack time, and accordingly the accuracy will be changed according to the quality of the disc. In other words, the longer the tex time, the greater the number of tracks on which STP data is recorded, and the higher the accuracy of the disc quality. On the contrary, if the tack time is shortened, the number of tracks on which STP data is recorded is small, but the accuracy of the check on the disc quality is lowered in proportion.

The damper area is then positioned as a spare track again next to the STPA area. The damper region is located up to about 75 minutes 47 seconds, preferably about 16.2 tracks.

Of course, the number of tracks in the damper area and the STPA area included in the lead-out area is not determined, but it is preferable to determine the number of tracks suitable for testing the quality of the optical disc according to the present invention.

Accordingly, as shown in FIG. 5, the optical disc according to the present invention has a slightly longer data area in the data area of the conventional optical disc.

The task signal (STP data) used in the CDIT of the present invention can use any ASCII code (0 to 255 in decimal). This ASCII code is shown in Table 1.

Among them, 242 codes are very suitable for the STP data because they have many 3T pulses after EFM modulation. This is because it is very difficult to detect the shortest 3T path at the time of data reproduction from the disc. However, since the 242 code has more of the 3T signal than other codes, it is easier to detect the 3T signal than other codes.

The process of inspecting the quality by mounting an optical disc having such a structure in a drive is as follows.

6 is a flowchart illustrating an optical disc quality inspection process according to the present invention.

First, the controller 41 controls the moving pickup 46 to move the uppermost optical disk 60 to the drive 40 among the optical disks stacked on the first spindle 48. The optical disk 60 moved into the drive 40 is mounted on the top of the spindle motor 62.

When the optical disk 60 is mounted on the spindle motor 62, the microprocessor 82 controls the system in a state where the system can be operated to perform a command applied from the controller 41. For example, the servo processor 80 is controlled to move the pickup device 70 to the innermost circumference of the optical disc 60 (step 101) or the digital signal processor 78 and the high frequency amplifier 76 and other drives. Control their operation to the initial state possible.

The movement of the pickup device 70 to the innermost circumference of the disk is determined by the detection of the limit switch located at the innermost circumference of the optical disk (step 103).

The initial step for the quality inspection of the currently loaded disc is completed by the confirmation of step 103, and as a next step, the controller 41 tells the pick-up device 70 to be positioned at the start of the lead out area of the disc. Command

The command is transmitted to the microprocessor 82 through the interface 90, and the microprocessor 82 receives the command from the interface 90 to control the servo processor 80 to control the pickup device 70. The slide motor 64 is driven for the long track jump (step 105).

During the movement of the optical pickup apparatus 70 in the step 105, a point where the current optical pickup apparatus 70 is located is continuously detected by the signal reproduced from the optical pickup apparatus 70 (step 107). In the position detection according to the step 107, the position at which the optical pickup device 60 is located in the microprocessor 82 is determined by detecting the number of moving tracks of the optical pickup device 70.

The movement of the optical pickup device 70 by driving the slide motor 64 is repeated until the start point (about 75 minutes and 30 seconds) of the lead-out area is detected (step 117). This is because the movement of the optical pickup device 70 driven by the slide motor 64 becomes a long track jump, so that the long track jump is usually moved by tens or hundreds of tracks.

If the microprocessor 82 determines that the position of the current optical pickup device 70 is located at the start point of the lead-out area (about 75 minutes and 30 seconds) in operation 109, the microprocessor 82 may transmit the servo processor 80. Control to turn off the drive of the slide motor (64).

Then, the tracking actuator of the optical pickup device 70 is driven to control the track movement of the optical pickup device. At this time, the track movement of the optical pickup device 70 is moved by N pieces. The N tracks refer to as many tracks as are located from the start point of the lead-out area to the start point of the STPA area. In this process, the microprocessor 82 continuously reads the current position of the optical pickup apparatus 70 and monitors whether the optical pickup apparatus is located at the start point of the STPA area (steps 111 and 113).

The track movement is repeated until the optical pickup device is located at the start point of the STPA area (step 115), and when the optical pickup device is located at the start point (about 75 minutes and 32 seconds) of the STPA area (step 113). In operation 119, the controller 41 records test data in the STPA area (operation 119).

In step 119, the STP data is inputted from the controller 41 to the interface 90, and then the laser diode drive 72 is driven under the control of the write control logic 74 so that the optical pickup device 70 may enter the STPA region. Record the STP data.

When the recording of the STP data is completed in the STPA area in step 121, the microprocessor 82 moves the optical pickup device 70 again by N tracks in the inner circumferential direction. By the operation up to this point, the operation of recording test data in a predetermined portion (STPA area) of the optical disc 60 during the quality inspection is completed.

Then, a task is carried out whether or not the recorded test data is normally reproduced. First, the optical pickup device in the inner circumferential direction is moved N tracks. That is, the optical pickup device 70 returns to the position of the start point (about 75 minutes and 32 seconds) of the STPA (step 123).

When the optical pickup device 70 is located at the start point of the STPA by performing the step 123 (step 125), the microprocessor 82 drives the optical pickup device 70 to record the STP data recorded in the area of the STPA. Read (Step 127)

Data reproduction by the step 127 is performed up to the end position (about 75 minutes 42 seconds) of the STPA, and when the position of the optical pickup device 70 is located at about 75 minutes 42 seconds, STP data reproduction Is completed (step 129).

By the above process, the STP data is recorded in a predetermined area (STPA) of the lead-out area of the optical disc, and the operation of reproducing the recorded STP data has been performed.

Next, it will be necessary to compare the reproduced STP data with the STP data before recording. The data comparison operation will be continuously performed while reading STP data recorded in the STPA area of the disk in the step 127 through the step 129.

That is, the data read from the optical pickup device 70 in step 127 is amplified by the high frequency amplifier 76 by a predetermined amount, and then the digital signal processor 78 performs digital signal processing such as demodulation and error correction.

The reproduction data subjected to the digital signal processing is input to the controller 41 through the interface 90. The controller 41 compares the inputted reproduction data with the STP data (reference data) previously stored in the memory (step 131). That is, the controller 41 stores the source STP data transmitted to the drive 40 through the interface 90 in its memory at the beginning of the quality inspection of the optical disk, and then stores the data reproduced from the optical disk in the memory. Is to do a comparison with the data.

That is, the controller 41 and the microprocessor 82 continuously transmit and receive data through the interface 90 in the process of determining the quality of the disk so that data collision does not occur in the control operation of each other.

When the error value of the reproduction data compared with the reference data in step 131 is included within a predetermined range, it is determined that the two data are the same. However, when the error value of the reproduction data compared with the reference data in the reference step is out of a predetermined range, it is determined that the two data are different (step 133).

The controller 41 determines whether the mounted disk is good or bad according to the determination of the step 133 (step 135 and step 137). Then, the controller 41 displays the quality of the disc on the display unit 68 so that the user can know according to whether the mounted disc is good or bad (Step 139).

As described above, the present invention mounts the optical disk manufactured by the conventional process to the drive 40 under the control of the controller 41, and then moves the optical pickup device 70 to the desired STPA area. That is, the controller 41 of the present invention searches for and moves to a characteristic track of ATPI conforming to the data format (STP), records the STP data, reproduces it, and stores the readout signal and the reference data previously stored in the memory. Compare the to determine whether the disk is bad.

However, it is not necessary to limit the determination of whether the disc is defective or good according to the present invention by the controller 41 outside the drive 40 at all times.

That is, as shown in FIG. 3 as another embodiment of the present invention, when the memory 84 and the comparator 86 are provided in the drive 40 itself, the optical pickup device 70 in step 127 is performed. The data read out from the amplification unit may be amplified by the high frequency amplification unit 76, and then reproduced data obtained by digital signal processing such as demodulation and error correction may be input to the microprocessor 82. .

The reproduction data input to the microprocessor 82 is transmitted to the comparator 86, and the comparator 86 compares the reproduction data input from the microprocessor 82 with the data read from the memory 84 ( Step 131), it is determined whether the two data are the same (step 133), and according to whether or not the determination of the step 133, the good or bad of the mounted disk (step 135, step 137).

Then, the microprocessor 82 displays the quality of the disc on the display unit 68 so that the user can know according to whether the mounted disc is good or bad (Step 139).

Next, in the description of the present invention, a drive for recording or reproducing STP is described in one drive, but recording and reproducing may be performed in another drive in order to reduce tack time.

As described above, the disc determined as defective moves the pickup 46 toward the spindle 52 for stacking the defective disk, and the pickup 46 moves the defective disk for the spindle 50 for stacking the good disk. .

Next, Fig. 7 is a flowchart showing an optical disc quality inspection process according to another embodiment of the present invention.

7 is a flowchart illustrating an operation process for directly moving the optical pickup device 70 to the area of the STPA immediately after loading the disk in order to reduce the tack time.

In other words, immediately after the disc is loaded, the optical pickup device 70 is turned on to determine the current position, and immediately moves to the STPA area. That is, in FIG. 7, processes from steps 101 to 103 shown in FIG. 6 are omitted.

Since the operation is performed as shown in FIG. 7, the process of moving the pickup to the position of the innermost circumference and detecting the operation start position of the pickup by detecting the limit switch is omitted.

Next, Fig. 8 illustrates another embodiment for quality inspection of an optical disc according to the present invention.

First, an optical disc manufactured by a general disc manufacturing process is stacked on the spindle 48 (step 201), and the spindle 48 on which the manufactured optical disc is stacked is transferred to the inspector (step 203).

Then, the tray of the drive 40 in the inspection machine is opened (step 205), and the optical disk on the top of the spindle 48 is sucked by the transfer pickup 46 (step 207).

Then, the surged optical disc is moved to the tray (step 209), and the disc is loaded on the tray (step 211). Then close the tray (step 213).

Then, the microprocessor 82 moves the optical pickup device 70 to the innermost circumference of the optical disc 60 (step 215), and detects a starting point for the movement operation of the optical pickup device by detecting the limit switch. (Step 217).

Subsequently, the operation until the optical pickup device 70 finds the starting point of the STPA area of the lead-out area of the optical disc is performed up to step 229, and the operations from step 217 to step 229 are performed in FIG. 6. Since it is made the same as the detailed description thereof will be omitted.

Next, when the optical pickup device 70 is located at the start point of the STPA area in step 227, the microprocessor 82 performs an operation of reading data recorded in the STPA area (steps 231 to 235). ).

When the STP data recorded in the area of the STPA exists in the above process (step 237), the microprocessor 82 determines that test data for checking the quality of the disk has already been recorded in the STPA area of the optical disc, and recorded While the data is reproduced, a comparison operation with the reference data is performed (step 239).

However, when data is reproduced to the end position of the STPA area of the disc, if there is no reproduced data, the microprocessor 82 determines that test data is not recorded (step 237).

Then, the microprocessor 82 moves the optical pickup device 70 by N tracks in the inner circumferential direction of the disk. At this time, the microprocessor 82 monitors the movement track of the optical pickup device 70 until the optical pickup device 70 is located at the start point (about 75 minutes and 32 seconds) of the STPA area of the optical disc (steps 243 through 243). Step 247).

When the current position of the optical pickup device is located at the start point of the STPA area of the optical disk in step 247, the STP data is written under the driving of the write control logic 74 and the laser diode drive 72 (steps 249 and 5). 251 step).

When the recording of the STP data is completed in step 251, the operation of reproducing the recorded data is performed thereafter. This process is also the same as the process of Fig. 6, so a detailed description thereof will be omitted. The reproduction operation of the recorded data is performed in steps 253 to 259).

The data reproducing operation is completed by performing the operation up to step 259, and thereafter, the comparator 86 compares the reproduction data with the reference data (step 261).

By the comparison operation of step 261, it is determined whether the disk mounted in the drive 40 is good or bad.

In other words, when the test data is not recorded in the STPA area of the mounted disc from the step 237 to the step 261, the process of recording and reproducing the test data and then performing the comparison is described.

Accordingly, after comparing the playback data with the reference data in steps 239 and 261, a good disc or a bad disc is determined in step 263.

In operation 263, the disk determined as the good disk is transferred to the spindle 50 in which the good disks are stacked under the control of the controller 41. That is, the tray is opened, and the disc 60 is circulated by the transfer pick-up and transferred to the good quality spindle 50 (steps 265 to 271).

In operation 263, the disk determined as the defective disk is transferred to the spindle 52 in which the defective disks are stacked under the control of the controller 41 (steps 273 to 279).

After the disk separation operation according to the quality in the steps 271 and 279 is performed, the mobile pickup 46 moves to the first spindle 48 under the control of the controller 41, and thus the first spindle 48. It is determined whether a disk exists on the disk. If a disk exists, one disk is again mounted on the drive 40 by the mobile pickup 46, and if the disk does not exist on the first spindle 48, the first spindle is replaced. Returning to step 207 to repeat the above process (steps 281 to 287).

In the above description of the process of FIG. 8, the quality of the disc is determined by the microprocessor 82 in the drive 40. However, as in the embodiment described in FIG. 6, the quality of the disc can be determined by the controller 41 in the CDIA, and of course, by the external computer 95.

As described above, the present invention automatically loads the manufactured optical disc, records and reproduces a test program in a specific area within a short time, and measures the quality of the disc. Therefore, the optical disk quality inspection method and apparatus according to the present invention can increase the reliability while inspecting the quality of all manufactured optical disks, and can reduce the manufacturing cost while reducing the test time according to the quality inspection. .

Claims (10)

Recording / reproducing means for recording / reproducing test data in a specific area of the disc; Storage means for storing source test data recorded on the disc by the recording / reproducing means; And a disc quality discriminating means for discriminating the quality of the disc by comparing the reproduced signal reproduced from said recording / reproducing means with the signal stored in said storage means. The optical disc quality inspection apparatus according to claim 1, wherein the test data recorded in a specific area of the disc is input by a user. A plurality of storage means for storing the manufactured disk; Recording / reproducing means for recording / reproducing test data in a specific area of the disc; Moving means for selectively moving a disk between the storage means and the recording / reproducing means; And a disc quality discriminating means for discriminating the quality of the disc by comparing the reproduced signal reproduced from said recording / reproducing means with a reference signal. 4. The optical disc quality inspection apparatus according to claim 3, further comprising control means for controlling the recording / reproducing means, wherein the disc quality discriminating means is included in the control means. 4. An optical disc quality inspection apparatus according to claim 3, further comprising control means for controlling said moving means, wherein said disc quality discriminating means is included in said control means. 4. An optical disc quality inspection apparatus according to claim 3, further comprising external control means capable of inputting data into said recording / reproducing means, wherein said disc quality discriminating means is included in said control means. The optical disc quality inspection apparatus according to any one of claims 3 to 6, wherein the disc quality discriminating means can selectively set a range of a reference signal for disc quality determination. 8. An optical disc quality inspection apparatus according to claim 7, wherein said test data can use ASCII codes. Searching for a specific area of the disc; Recording test data in a specific area of the disc; Regenerating data recorded in the specific area; And comparing the play data with the reference data to determine the quality of the disk. Searching for specific domains of the disc; Determining whether test data is recorded in a specific area of the disc; Recording test data in the specific area when the recorded signal is absent; Reproducing data recorded in the specific area; And comparing the reproduction signal with reference data to determine the quality of the disc.