JPH09190383A - Data recording method, data recording device, data reproducing method, and data recording medium - Google Patents

Abstract

A data recording method, a data recording device, a data reproducing method and a data recording medium, for example, a CD-ROM
The present invention is applied to a manufacturing apparatus such as the above, a reproducing apparatus, and the like so that various data can be recorded separately. SOLUTION: A defect is intentionally formed before forming a reflective film so that a bit error occurs in a predetermined sector 8, and data is separately recorded by the sector 8 in which the bit error occurs.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a data recording method,
The present invention relates to a data recording device, a data reproducing method, and a data recording medium, such as a CD-ROM (Compact Disk-Read Onl).
y Memory) manufacturing device, reproducing device, etc., a defect is intentionally formed before the formation of a reflective film so that a bit error occurs in a predetermined sector. Data is separately recorded according to the generated sector.

[0002]

2. Description of the Related Art Conventionally, a CD-ROM has been used for supplying a computer program or the like because it can be mass-produced in the same manufacturing process as a compact disc and can record a large amount of data.

That is, in the process of producing a CD-ROM, after a series of user data to be recorded is divided into blocks, auxiliary data consisting of error correction codes, sync data, and a header are added to each block. Further, in the production process, scramble processing is subsequently performed to convert user data into serial data according to the data structure of the CD-ROM.

Further, in the production process of the CD-ROM, the serial data is encoded according to the format of the compact disc, and EFM (Eight to Fourteen Modula).
tion) Modulate to create a mother disk. As a result, a CD-ROM has a stamper formed from this mother disk, and a reflective film or the like is formed on a disk-shaped member manufactured from this stamper, so that it can be mass-produced.

[0005]

By the way, it is conceivable that this type of disc-shaped recording medium is used to supply a large amount of data such as a computer program, so that a so-called pirated copy is created by illegal copying. Therefore, it is required to effectively avoid this kind of illegal copying.

In this case, if it is possible to set unique identification data, a password, etc. to each disk-shaped recording medium, it is considered that this kind of illegal copying can be effectively avoided. In this case, a method of recording this kind of data by irradiating the completed disk-shaped recording medium with a laser beam again to form pits can be considered.

In this case, however, it is necessary to control the pit shape and the pit formation position with high precision with respect to the already formed pit row, and as the recording density is improved, pits of the same size as the preformed pits are formed. Forming has a practically difficult problem. On the other hand, a method of separately recording a dedicated area for recording this kind of data and forming pits in this area to record this kind of data is also conceivable. Is reduced. In addition, it becomes possible to confirm this dedicated area from the appearance, and there is a problem that this kind of data can be easily decoded.

Further, when a pit is formed by irradiating a laser beam again on the disk-shaped recording medium thus completed, there is a possibility that dust or the like accompanying the processing adheres to the surface and the original data cannot be correctly reproduced. is there.

The present invention has been made in consideration of the above points, and a data recording method, a data recording device, a data reproducing method and a data recording method capable of easily and surely recording identification data or the like peculiar to a disc-shaped recording medium. It is intended to propose a data recording medium.

[0010]

In order to solve such a problem, the present invention is applied to a data recording method for a disc-shaped recording medium which is produced by attaching a reflection film to a disc-shaped member produced by a stamper. In this data recording method, when a disc-shaped recording medium is reproduced, a bit error that is difficult to correct is generated in a predetermined sector,
A defect is formed on the disk-shaped member, and desired data is recorded by setting the predetermined sector.

At this time, a sector from which a bit error that is difficult to correct is generated is selected by selecting from a plurality of preset sectors.

Further, at this time, the preset address data of a plurality of sectors is separately recorded on the disk-shaped recording medium.

Instead of this, the sector in which the bit error which is difficult to correct the error occurs is formed so that the address data can be reproduced.

Further, instead of this, the reference signal is recorded continuously in the sector in which a bit error in which error correction is difficult occurs.

Further, the error correction code is included in the desired data.

The present invention is applied to a data recording device for recording desired data on a disk-shaped recording medium which is formed by forming a disk-shaped member by a stamper and then attaching a reflective film to the disk-shaped member. This data recording device reproduces the disc-shaped member to reproduce the data recorded by the stamper and outputs the reproduction data, and a reproduction means for reproducing the disc-shaped recording medium based on the reproduction data. Defect forming means for forming a defect in the disk-shaped member so that a bit error that is difficult to correct is generated in a predetermined sector.

At this time, the defect forming means selects from a plurality of preset sectors and sets the sector in which the bit error in which the error correction is difficult occurs occurs.

Instead of this, the above-mentioned defect forming means is
The address data forms a sector in which a bit error that is difficult to correct is generated so that the address data can be reproduced.

Further, the present invention is applied to a data reproducing method of a recording medium for data produced by attaching a reflection film to a disk-shaped member produced by a stamper, and the result of detection of a sector in which a bit error which is hard to correct is generated. The data separately recorded on this disc-shaped recording medium is reproduced.

At this time, a sector in which a bit error that is difficult to correct is generated is detected from a plurality of preset sectors, and the previous detection result is generated.

Further, at this time, the previously set plural sectors are detected from the information of the sectors separately recorded on the disc-shaped recording medium.

Also, when the recording medium is reproduced by applying it to a recording medium for recording data formed by attaching a reflection film to a disk-shaped member formed by a stamper, a bit error that is difficult to correct is a predetermined sector. As described above, a defect is formed in the disk-shaped member, and desired data is recorded by setting a predetermined sector.

At this time, a sector from which a bit error for which error correction is difficult occurs is set by selecting from a plurality of preset sectors.

Further, at this time, the address data of the previously set plural sectors is separately recorded.

Alternatively, the address data can be reproduced so that the sector in which the bit error, which is difficult to correct the error, occurs is formed.

Further, instead of this, the reference signal is recorded continuously in the sector in which the bit error for which the error correction is difficult occurs.

Alternatively, the desired data may be replaced by
The error correction code is included.

By applying these means to the data recording method of the disc-shaped recording medium produced by attaching the reflection film to the disc-shaped member produced by the stamper, an error occurs when the disc-shaped recording medium is reproduced. If a defect is formed on the disk-shaped member so that an uncorrectable bit error occurs in a predetermined sector and desired data is recorded by setting the predetermined sector, it is difficult to detect this kind of defect. It is possible to form a flat recording medium and separately record desired data.

More specifically, by selecting from a plurality of preset sectors and setting a sector in which a bit error for which error correction is difficult occurs, desired data can be recorded by this setting. it can.

Further, at this time, if the preset address data of a plurality of sectors is separately recorded on the disk-shaped recording medium, desired data can be recorded on the basis of the address data of the plurality of sectors.

Alternatively, the sector in which the bit error that is difficult to correct is generated is formed so that the address data can be reproduced, and the sector in which the bit error that is difficult to correct is generated is surely detected. can do.

Further, instead of this, if the reference signal is recorded continuously in the sector where the bit error which is difficult to correct the error occurs, the operation abnormality of the reproducing device due to the defect of this kind is converged by the reference signal. You can

If an error correction code is included in the previously desired data, in the disk-shaped recording medium,
It is possible to effectively avoid the influence of a bit error or the like caused by a cause other than this defect.

That is, when applied to a data recording device, the data recording device reproduces the disk-shaped member to reproduce the data recorded by the stamper and outputs the reproduced data, and the reproducing means. Based on the above, when the disc-shaped recording medium is reproduced, a defect forming means for forming a defect in the disc-shaped member is provided so that a bit error that is difficult to correct is generated in a predetermined sector.
It is possible to form a disk-shaped recording medium in which it is difficult to detect this kind of defect, and to form a bit error in which error correction is difficult in a desired sector.

Further, in the reproducing apparatus, the data recorded separately on the disc-shaped recording medium is reproduced based on the detection result of the sector in which the bit error which is difficult to correct the error occurs, so that the disc-shaped recording medium is recorded uniquely. The reproduced data can be reproduced.

Further, when the recording medium is reproduced by applying it to a recording medium of data produced by attaching a reflection film to a disk-shaped member produced by a stamper, a bit error which is difficult to error-correct is a predetermined sector. As described above, if a defect is formed in the disk-shaped member and desired data is recorded by setting the predetermined sector, it becomes difficult to detect this kind of defect and desired data can be recorded separately. it can.

[0037]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an optical disc according to an embodiment of the present invention. The optical disc 1 is formed by sequentially forming a reflection film 3 and a protection film 4 on a polycarbonate substrate 2 and recording various information by pits. In the optical disc 1, the information recording surface 5 is divided into concentric circles, and the inner peripheral side and the outer peripheral side are assigned to the management data recording area 6 and the user data recording area 7, respectively.

The user data recording area 7 is formed so as to record information such as a computer program provided to the user, and the management data recording area 6 is used for managing various files recorded in the user data recording area 7. Information such as data and the volume of the optical disc 1 is recorded. As a result, in the optical disc 1, the user data recording area 7 is accessed according to the contents of the management data recording area 6 so that various files recorded on the optical disc 1 can be accessed.

Further, the optical disc 1 is formed so as to manage the user data recording area 7 in sector units,
A plurality of sectors formed in these user data recording areas 7 are discretely and selectively allocated to the individual information recording sectors 8. In the optical disc 1, the individual information recording sector 8 is selectively formed in a sector in which error correction is difficult, and by setting the sector in which error correction is difficult, data (that is, ID information or the like) specific to the optical disc 1 can be recorded. It is done like this. Further, the optical disc 1 allocates one of a plurality of sectors to the conversion table sector 9 and records the conversion table necessary for decoding this unique data.

Further, on the optical disc 1, the position information of the individual information recording sector 8 and the position information of the conversion table sector 9 are recorded in the management data recording area 6 as the individual sector management data 10.

FIG. 2 is a table showing the sector structure of the optical disc 1. This optical disc 1 has 15 sectors.
Each frame is composed of 170 bytes of data. The optical disc 1 allocates the head frame of each sector to a label frame and stores sector addresses, system information, and 8-byte and 15-byte error correction codes (that is, C
1 code and C2 code) form a frame for this label.

Further, the optical disk 1 divides the user data that is successively continuous in units of 154 bytes, and adds C1 code and C2 code of 8 bytes and 15 bytes, respectively, to form the remaining 14 frames. In the last frame, an error detecting code (EDC) is assigned instead of part of the user data.

After the data structure is interleaved, the optical disc 1 is added with sync data, a header, etc., subjected to a predetermined encoding process, and recorded by a pit string.

In the basic structure of this sector, the individual information recording sector 8 is allocated with useless data having no meaning as user data, and is further selectively allocated to a sector in which error correction is difficult. There is.

That is, for the above data structure, C1
A reproduction system is practically conceivable in which a 2-byte error correction is performed by a code, an error detection process is performed for more bit errors, and a 14-byte erasure correction is performed by a C2 code. In this case, forming a bit error of 3 bytes or more for the C1 code and the corresponding user data makes it difficult to correct the error by the C1 code. Therefore, for each frame forming one sector,
If each bit error of 3 bytes or more is formed, C2
The error also becomes difficult to correct depending on the code, and eventually it becomes difficult to correct in this sector. As a result, the individual information recording sector 8 is formed so that a bit error of a predetermined value or more is formed and is selectively assigned to a sector that is difficult to correct.

As a result, as shown in FIG. 3, in the optical disc 1, the sector addresses A0, A1, A2, ..., X6, X are sequentially read according to the individual sector management data 10.
By sequentially reproducing the individual information recording sector 8 designated by 7,
Each individual information recording sector 8 can detect whether or not error correction is difficult. Further, a bit string formed by setting the individual information recording sector 8 in which error correction is difficult as a logical "1" and the individual information recording sector 8 in which error correction is possible as a logical "0" is used as the sector address A0, A of each individual information recording sector 8.
1, A2, ..., X6, X7 are used as a reference to rearrange by the conversion table recorded in the conversion table sector 9 so that ID information and an error correction code (ECC) of this ID information can be generated. Has been done. Thus, in the optical disc 1, even when the ID information is recorded by using the bit error as described above, the ID information can be surely reproduced by effectively utilizing the error correction code.

If this kind of bit error is formed on the data string to be recorded on the optical disc 1, the reproduction data obtained from the reproduction signal of the optical disc 1 can be copied as it is and illegally copied. On the other hand, if a bit error of this kind is formed by irradiating the finished optical disc 1 with a laser beam or the like, the optical disc 1
Can be found to find this kind of bit error.

Therefore, in this optical disc 1, the reflection film 3
A laser beam is irradiated in the state of a semi-finished product before the attachment of the laser beam, thereby intentionally forming a defect and forming a bit error. Further, in order to effectively avoid the malfunction of the servo system which may be caused by forming defects in this way,
Guard sectors are arranged before and after the individual information recording sector 8.

FIG. 4 is a schematic diagram showing the arrangement of the individual information recording sectors 8 and the guard sectors 11. The guard sector 11 is formed in the same manner as the individual information recording sector 8 except that no bit error is intentionally formed. That is, in the reproducing system, P is set based on the pit formation period.
A reproduced clock is formed by the LL circuit, and processing such as tracking servo is executed based on the pit train. Therefore, if the defect is formed and the bit error is formed as described above, the PLL circuit and the servo system may malfunction. As a result, when the guard sector 11 is arranged before and after the individual information recording sector 8 as in this embodiment, the operation of the PLL circuit and the servo system is normally operated by utilizing the time for reproducing the guard sector 11. It is possible to return to, and the following sector can be correctly reproduced.

FIG. 5 is a flow chart showing the manufacturing process of the optical disc 1. This optical disc 1 is used for user data supplied by a hard disk or the like.
Sequentially, a data string of a sector unit is formed by the above-mentioned data structure, data of the individual information recording sector 8 and the guard sector 11, etc. are allocated between the data strings, and the glass substrate is photoetched according to these series of data strings. A pit row is formed. Furthermore, this optical disc 1
A mother disk and a stamper are formed from a glass substrate.

When a stamper is formed in the manufacturing process of the optical disc 1, steps SP1 to SP
2, the disc-shaped member made of polycarbonate is formed from this stamper by a technique such as injection molding or compression molding, and the pits of the stamper are transferred to this disc-shaped member. Further, in the subsequent step SP3 of the optical disc 1, a defect is formed in a desired individual information recording sector 8 while reproducing the disc-shaped member and confirming the address of each sector. That is, as shown in FIG. 6, a laser beam is applied to the pit row formed on the disk-shaped member, and a defect is formed to the extent that the above-mentioned bit error that is difficult to correct occurs.

Subsequently, the optical disc 1 returns to the normal manufacturing process, and in step SP4, a metal film is attached by, for example, vapor deposition to form a reflection film, and then in step SP5.
At, a protective layer is formed. Furthermore, the optical disc 1 is
After processing such as label printing, move to step SP6,
It is considered a finished product.

As a result, the optical disc 1 is formed with a defect that is difficult to error-correct in the stage before the formation of the reflection film, and in the finished product, this type of defect formation cannot be visually confirmed. Therefore, it is possible to effectively cope with the illegal copy.

FIG. 7 is a block diagram showing a defect forming apparatus for forming a defect that is difficult to correct in an error before the formation of the reflection film. In this defect forming apparatus 20, an optical disk 21 before forming a reflective film is rotationally driven by a spindle motor 22, and in this state, an ultraviolet laser L is emitted from a laser 23.

That is, the laser 23 responds to the trigger signal output from the switching circuit 24 and is driven by the drive circuit 25 controlled by the switching circuit 24.
The laser beam L of ultraviolet rays is emitted by being excited by the laser beam. The light modulator 26 is controlled by the switching circuit 24 to control the light amount of the laser beam L, and thereby raises and emits the light amount of the laser beam L at the time of defect formation, whereas in the normal reproduction. , Is emitted with a predetermined amount of light.

The optical pickup 27 is held by the servo circuit 28 so as to be movable in the radial direction of the optical disc 21, and the optical path of the laser beam L emitted from the optical modulator 26 is bent to irradiate the optical disc 21. . At this time, the optical pickup 27 irradiates the optical disc 21 with this laser beam L through an objective lens that is held by the servo circuit 28 so as to move vertically and horizontally, and at the same time, returns light obtained from the optical disc 21. Is received by the light receiving element via this objective lens.

As a result, the optical pickup 27 can move the objective lens and perform tracking control and focus control based on the result of receiving the return light. Here, the light-receiving optical system such as a light-receiving element that receives the return light is an ordinary compact disc player, etc., except that the input / output characteristics of the light-receiving element are set so that the return light composed of ultraviolet rays can be received. The optical pickup 27 can generate a tracking error signal, a focus error signal, and a reproduction signal RF based on the reception result of the return light.

The reproduction system 29 detects the sector address recorded on the optical disk 21 by processing the reproduction signal RF output from the optical pickup 27. That is, in the reproducing system 29, the demodulation circuit 30 amplifies the tracking error signal and the focus error signal with a predetermined gain and outputs them to the servo circuit 28.
Moves the objective lens of the optical pickup 27 so that the signal levels of these tracking error signal and focus error signal become 0 level, thereby performing tracking control and focus control.

Further, the demodulation circuit 30 receives the reproduction signal RF in a built-in PLL circuit and generates a reproduction clock here,
The speed control circuit 31 rotationally drives the spindle motor 22 so that the reproduction clock has a constant frequency, thereby rotationally driving the optical disk 21 at a predetermined rotational speed.

Further, the demodulation circuit 30 outputs the reproduction signal RF to 2
After digitization, it is sequentially converted into serial data based on the reproduction clock. Subsequently, the demodulation circuit 30 decodes this serial data and outputs it to the deinterleave circuit 32.

The deinterleave circuit 32 performs error correction processing and deinterleave processing on the output data of the demodulation circuit 30 and outputs it. As a result, the reproducing system 29 can reproduce the data of each sector recorded on the optical disk 21.

The ECC decoder 33 receives the reproduction data D2 from the deinterleave circuit 32, corrects the reproduction data D2 with a C1 code, and detects the address data AD of each sector. ECC decoding 33
Demodulates data in the management table and conversion table sector.

The system control circuit 34 is composed of a microcomputer for controlling the reproducing system and the servo system of the defect forming apparatus 20, and outputs the address data AD detected by the address decoder 33 to the controlling computer 35.

The control computer 35 uses the laser 23
And a laser beam irradiation position is monitored with reference to the address data AD output from the system control circuit 34. Further control computer 35
Controls the switching circuit 24 when the laser beam scans the above-mentioned individual information recording sector 8 and the individual information recording sector 8 is the individual information recording sector 8 corresponding to the ID information to be recorded on the optical disc 21. , Increase the light quantity of the laser beam L.

At this time, the control computer 35 detects the defect formation timing with reference to the sync data and the header detected by the demodulation circuit 30 via the error generation timing circuit 39, and raises the light amount of the laser beam L. increase. As a result, the defect forming device 20 sequentially forms defects according to the ID information recorded on the optical disc 21. Note that this kind of defect can be formed at a fixed timing unless the error correction method and the address position are changed, so that the error occurrence timing circuit 39 uses the sync data and the header as a reference and at a preset timing. Further, if necessary, these timings are switched based on the reproduction / reproduction results of the management table and conversion table sector, and a defect formation timing signal is output to the switching circuit 24 and the system control circuit 35.

FIG. 8 is a block diagram showing a reproducing apparatus for the optical disc 1. This reproducing device 40 switches its operation in response to a command from the host computer H,
The data recorded on the optical disc 1 is reproduced and output to the host computer H, whereby the file recorded on the optical disc 1 is installed in the host computer H.

At this time, in the reproducing apparatus 40, the floppy disk corresponding to this optical disk 1 is the host computer H.
The host computer H issues a control command in accordance with the installation program recorded in the floppy disk and recorded in the floppy disk, thereby executing a series of installation operations in accordance with the installation program.

That is, the reproducing apparatus 40 drives the optical disk 1 to rotate by the spindle motor 42. The optical pickup 43 is controlled by the servo circuit 41, is held so as to be movable in the radial direction of the optical disc 1, and irradiates the optical disc 1 with a laser beam. At this time, the optical pickup 43 irradiates the optical disc 1 with this laser beam through the objective lens which is controlled by the servo circuit 41 and is held so as to be movable vertically and horizontally, and at the same time, returns light obtained from the optical disc 1. The light is received by the light receiving element through this objective lens.

As a result, the optical pickup 43 can move the objective lens to perform tracking control and focus control based on the result of receiving the return light.
In addition, tracking error signal, focus error signal,
The playback signal can be output.

The amplifier circuit 44 amplifies these tracking error signal, focus error signal and reproduction signal.
Further, the amplifier circuit 44 outputs the tracking error signal and the focus error signal to the servo circuit 41, and the servo circuit 41 performs tracking control and focus control based on these tracking error signal and focus error signal.

The demodulation circuit 45 has a built-in PLL for reproducing signals.
The circuit receives the reproduced clock, and the speed control circuit 46 rotationally drives the spindle motor 42 so that the reproduced clock has a predetermined frequency, thereby rotating the optical disc 1 at a predetermined rotational speed. Further, the demodulation circuit 45 binarizes the reproduction signal and then sequentially converts the reproduction signal into serial data using the reproduction clock as a reference. Subsequently, the demodulation circuit 45 decodes the serial data, and then the EC
Output to the C decoding circuit 47.

Thus, in the servo circuit 41, the speed control circuit 46, and the PLL circuit built in the demodulation circuit 45, tracking control, focus control, and spindle control are performed in the individual information recording sector 8 in which the defect is formed due to the defect. Even if the operation of the above is disturbed or the frequency of the reproduction clock fluctuates, it is possible to return to the normal state by the subsequent guard sector, and thereby the reproducing device 40 can surely reproduce the data of the following sector. It is made possible.

The ECC decoding circuit 47 includes a demodulation circuit 45.
The output serial data is input in sector units based on the sync data and header, subjected to error correction processing and deinterleave processing, and output. At this time, the ECC decoding circuit 47 notifies the system control circuit 49 of the sector address added to each sector together with the error correction processing result. As a result, in the reproducing apparatus 40, the system control circuit 49 can detect the individual information recording sector in which the defect is intentionally formed.

The EDC detection circuit 48 receives the output data of the ECC decoding circuit 47 and detects whether or not the error correction code added to the last frame of each sector can correct the error correctly by the C1 and C2 codes. The detection result is output to the system control circuit 49. As a result, in the reproducing apparatus 40, the individual information recording sector 8 in which the defect is intentionally formed is surely referred to by referring to the detection result by the error detection code (EDC) together with the error correction processing result by the C1 and C2 codes. It can be detected.
That is, when the error correction is performed using the C1 and C2 codes, there is a possibility of erroneous correction. As a result, in the playback device 40,
By detecting the logical sum of the error correction processing result by the C1 and C2 codes and the detection result by the error detection code (EDC), the individual information recording sector 8 in which the defect is intentionally formed can be surely detected. There is.

The buffer memory 53 stores the C1 and C2.
Error correction processing result by code and error detection code (ED
The logical sum data with the detection result of C) is accumulated and output to the host computer H via the interface circuit (IF) 50 at a predetermined timing. As a result, the reproducing device 40 reproduces and outputs the data recorded on the optical disc 1 in response to a request from the host computer H.

In contrast to the structure of the reproducing system, the system control circuit 49 is composed of a microcomputer for controlling the operation of the reproducing apparatus 40 as a whole, and when the optical disk 1 is loaded, the power is turned on again. Servo circuit 41
Is controlled to move the optical pickup 43 to the management data recording area of the optical disc 1.

Further, the system control circuit 49 switches the entire operation to the reproduction mode, reproduces this management data recording area, and fetches the management data as the reproduction result from the ECC decoding circuit 47. Thereby, the system control circuit 4
9 grasps the volume of the optical disc 1 and the like. In this process, the system control circuit 49 stores the sector address of the individual information recording sector designated by the individual sector management data in the memory 51 for the individual sector management data. Further, the system control circuit 49
The conversion table sector is reproduced with reference to this management data, and the conversion table recorded in this conversion table sector and necessary for decoding the ID information is stored and held in the memory 51.

After executing this series of preliminary processing, the system control circuit 16 issues a command to the host computer H and waits for a control command from the host computer H. When an install command is input from the host computer H in this state, the system control circuit 49 accesses the memory 51 and detects the sector address of the individual information recording sector stored in this memory 51. Further, the system control circuit 49 issues a control command to the servo circuit 41 and the like to sequentially reproduce the sectors designated by this sector address, and the ECC decoding circuit 4
7. The error correction processing result and the error detection result are input from the EDC detection circuit 48. As a result, the system control circuit 49
Sequentially detects whether or not error correction is possible with respect to preset individual information recording sectors.

Further, the system control circuit 49 converts the detection result of whether or not the error can be corrected into the data value of the logic "1" and the logic "0" according to the procedure described above with reference to FIG. This data value is arranged according to the conversion table. As a result, the system control circuit 49
Detects the ID information and the error correction code recorded on the optical disc 1 due to the bit error of the individual information recording sector, and performs the error correction processing by the individual information error correction circuit 52.

Further, the system control circuit 49 outputs the ID information thus detected in response to a request from the host computer H, and in response to this, the host computer H
When a command with a better understanding is input, a series of installation work is executed. As a result, in the reproducing apparatus 40, with respect to the illegally copied optical disc 1, it is difficult to correctly reproduce this kind of ID information, so that the installation work is interrupted.

In the above structure, the optical disc 1 has the user data converted into a predetermined data structure in sector units, and the individual information recording sector and the guard sector formed by the unnecessary data are formed at predetermined positions between consecutive sectors. Data is inserted, and a mother disk is formed by the series of data.

Further, the optical disc 1 is formed into a disc shape by the stamper made from this mother disc, and then the defect forming device 20 forms a defect in the individual information recording sector. Here, this defect is selectively produced from a preset individual information recording sector, at the stage of a finished product,
The individual information recording sector is formed to the extent that error correction is difficult.

The optical disc 1 is then completed with a reflective film and a protective film formed thereon. In this optical disc 1, the number of defects formed can be reduced as compared with the case where information is recorded by forming pits anew at the stage of the finished product by selectively forming defects at the stage before forming the reflective film. As a result, it is possible to effectively prevent dust and the like from remaining due to processing, and it is possible to form the optical disc 1 with difficulty in recognizing the appearance of this type of defect intentionally formed.

Further, by forming the guard sector following the individual information recording sector which forms the defect, bit errors and the like due to fluctuations of the reproduction clock during reproduction are effectively avoided.

Corresponding to this individual information recording sector, the optical disc 1 has the sector address of the individual information recording sector recorded in the management data recording area of the inner circumference, and the error correction processing result of this individual information recording sector is recorded as ID information. And a conversion table for converting into an error correction code is recorded in the conversion table sector.

As a result, when the optical disc 1 is reproduced, after detecting the error correction processing results of the individual information recording sectors in sequence by the sector address recorded in the management data recording area,
The ID information and the error correction code can be demodulated by the conversion table, and illegal copying can be effectively avoided according to the ID information.

Thus, in the case of recording the specific data by the defect as described above, the pit row already formed,
Defects can be formed by controlling the pit formation position with relatively low precision, and this kind of information can be recorded easily and surely.

According to the above configuration, a defect is formed before the reflective film is formed so that a bit error that is difficult to correct occurs, and the ID information is recorded in the sector that is difficult to correct, so that the appearance is improved. This kind of information can be recorded in a way that is difficult to read. Further, this kind of information can be recorded by a simple control, and accordingly, this kind of information can be recorded easily and surely, and for example, illegal copying can be effectively avoided.

In the above embodiment, the case where the present invention is applied to an optical disk to record ID information has been described, but the present invention is not limited to this, and may be applied to recording a password or the like.

Further, in the above-mentioned embodiments, the case where the invention is applied to the optical disk formed so as to record information by the pit row has been described, but the present invention is not limited to this, and is constituted by, for example, a laser beam guide groove. It can also be widely applied to optical discs having pregrooves.

[0092]

As described above, according to the present invention, a defect is formed before the reflection film is formed so that a bit error which is difficult to correct occurs, and the sector which is difficult to correct is unique to the disk-shaped recording medium. By recording the information of
It is possible to record this kind of information in a way that is difficult to read, and simply and surely.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an optical disc according to an embodiment of the present invention.

FIG. 2 is a table provided for explaining a data structure of the optical disc of FIG.

FIG. 3 is a diagram for explaining individual information recording sectors of the optical disc of FIG.

4 is a schematic diagram showing a relationship between individual information recording sectors and guard sectors of the optical disc of FIG.

5 is a flowchart showing a manufacturing process of the optical disc of FIG. 1. FIG.

FIG. 6 is a schematic diagram used for explaining defect formation of the optical disc of FIG.

7 is a block diagram showing a defect forming apparatus for forming the defects of FIG.

FIG. 8 is a block diagram showing a reproducing apparatus for the optical disc of FIG.

[Brief description of reference numerals]

 1 Optical Disc 3 Reflective Film 8 Individual Information Recording Sector 9 Conversion Table Sector 11 Guard Sector 20 Defect Forming Device 40 Reproducing Device

Claims (18)

[Claims] 1. A data recording method for a disc-shaped recording medium produced by attaching a reflection film to a disc-shaped member produced by a stamper, wherein a bit error that is difficult to correct when reproducing the disc-shaped recording medium. So as to occur in a predetermined sector, a defect is formed in the disk-shaped member, and desired data is recorded by setting the predetermined sector. 2. The data recording method according to claim 1, wherein a sector in which the bit error that is difficult to correct is generated is selected by selecting from a plurality of preset sectors. 3. The data recording method according to claim 2, wherein the preset address data of a plurality of sectors is separately recorded on the disk-shaped recording medium. 4. The data recording method according to claim 1, wherein the sector in which the bit error that is difficult to correct is generated is formed so that the address data can be reproduced. 5. The data recording method according to claim 1, wherein the reference signal is recorded continuously in the sector in which the bit error that is difficult to correct is generated. 6. The data recording method according to claim 1, wherein an error correction code is included in the desired data. 7. A data recording device for recording desired data on a disc-shaped recording medium, which is produced by forming a disc-shaped member by a stamper and then attaching a reflective film to the disc-shaped member. A reproducing means for reproducing the disc-shaped member to reproduce the data recorded by the stamper and outputting the reproduced data; and an error correction difficult when reproducing the disc-shaped recording medium based on the reproduced data. And a defect forming means for forming a defect in the disk-shaped member so that a bit error occurs in a predetermined sector. 8. The data according to claim 7, wherein the defect forming means selects from a plurality of preset sectors to set a sector in which the bit error that is difficult to correct is generated. Recording device. 9. The data recording apparatus according to claim 7, wherein the defect forming means forms a sector in which the bit error that is difficult to correct is generated so that the address data can be reproduced. 10. A data reproducing method for a disc-shaped recording medium produced by attaching a reflection film to a disc-shaped member produced by a stamper, wherein the disc is detected from a detection result of a sector in which a bit error which is difficult to correct is generated. A data reproducing method, characterized in that data recorded separately on a recording medium is reproduced. 11. From among a plurality of preset sectors,
2. A sector in which a bit error in which error correction is difficult has occurred is detected and the detection result is generated.
The data reproduction method described in 0. 12. The data reproducing method according to claim 11, wherein the preset plurality of sectors are detected from information of the sectors separately recorded on the disc-shaped recording medium. 13. A data recording medium produced by attaching a reflection film to a disc-shaped member produced by a stamper, and when the recording medium is reproduced, a bit error that is difficult to error-correct occurs in a predetermined sector. As described above, a defect is formed in the disk-shaped member, and desired data is recorded by setting the predetermined sector, the data recording medium. 14. The data recording medium according to claim 13, wherein a sector in which the bit error that is difficult to correct is generated is selected by selecting from a plurality of preset sectors. 15. The address data of a plurality of preset sectors is separately recorded.
A data recording medium according to item 4. 16. The address data is reproducible,
The data recording medium according to claim 13, wherein a sector in which the bit error that is difficult to correct is generated is formed. 17. The data recording medium according to claim 13, wherein a reference signal is recorded continuously in the sector in which the bit error that is hard to correct is generated. 18. The data recording medium according to claim 13, wherein the desired data includes an error correction code.