JPH11213390A - Optical information recording device, optical information recording method, and optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make second information such as characters and graphics to be recorded on a disk recordable without using an output difference of laser and to make clearer second information recordable by using the output difference jointly. SOLUTION: This optical information recording device consists of a modulation circuit 4 which generates a first modulation signal SB in accordance with first information SA, a orthogonal coordinate position detection circuit 5 which detects relative position information on a disk master plate 2 of a pickup, a character signal generation circuit 6 which generates second information SE in accordance with relative position information, a second modulation circuit 8 which changes a part of the modulation signal SB in accordance with second information SE, and an optical modulator 10B which modulates laser light in accordance with an output SD of the second modulation circuit 8. Second information which can be visually confirmed can be recorded in an area where first information like music or video is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical information recording device,
The optical information recording method and the optical information recording medium can be applied to, for example, a compact disk (CD) or digital video disk (DVD) recording device, a CD or DVD recording method, and a CD or DVD disk.
According to the recording apparatus and the recording method of the present invention, information such as music and video signals is recorded on an optical disk by turning a recording laser on and off in accordance with a method defined by the CD and DVD standards. At the same time, by dividing the emission pulse of the recording laser into two, it is possible to record the second information that is not defined in the standards such as CD and DVD on the same disk.

[0002] In the optical information recording medium of the present invention,
For example, in addition to music and video signals specified in the CD and DVD standards, new information that can be confirmed by visually observing the disc is recorded.

[0003]

2. Description of the Related Art For example, in a patent application filed by the present applicant (Japanese Patent Application No. 9-347532), second information such as characters and figures recorded on a disk is recorded as a large laser output difference. An optical information recording device, an optical information recording method, and an optical information recording medium that enable recording of clear second information are disclosed. Also,
Patent application filed by the present applicant (Japanese Patent Application No. 9-67)
No. 843) records an ID pattern such as a barcode by a watermark pattern in a lead-in or signal recording portion of an optical disk, and electrically detects the pattern to read out the disk ID or encryption to prevent copying and piracy. An optical information recording device, an optical information reproducing device, and an optical information recording medium aiming at the above are disclosed. Patent applications (Japanese Patent Application No. 9-173811) filed by the present applicant include:
An optical disc recording apparatus and optical disc which can record new information by dividing a pit of 9T or more into 4T + 1T + 4T and recording a space instead of the pit in the middle 1T, depending on whether the pit is divided into two or not. And an optical disk reproducing apparatus are disclosed.

According to the invention described in the above-mentioned patent application, second information that is not included in the CD standard, such as characters and graphics, is superimposed and recorded on a signal recording section of a compact disk (CD). It becomes possible. Of course, in this device, in addition to information such as characters and figures, EFM (Eight-to-Fourt) defined by the compact disc standard
een Modulation) The modulated signal is also recorded at the same time. Therefore, it is possible to reproduce a disc with high added value, which can be reproduced by a conventional player, and in which characters and graphics are recorded in a signal portion of the disc.

[0005]

However, in the above-mentioned conventional invention, the second information such as characters and figures is recorded as a change in laser output. For this reason, there is a possibility that the signal characteristics fluctuate at the boundary portion where the output of the laser changes, so that the change in the output of the laser cannot be made so large. As a result, there is a problem that the recorded second information such as characters and graphics is not very clear.

An optical information recording apparatus, an optical information recording method and an optical information recording medium of the present invention have been made in view of the above points, and output second information such as characters and figures to be recorded on a disk by laser output. Recording is possible without using the difference. Also,
When the output difference of the laser is used together, it is possible to record the second information more clearly. Therefore, the optical information recording medium of the present invention can increase the change of the disc due to the second information, so that the second information can be more clearly confirmed.

[0007]

According to an aspect of the present invention, there is provided an optical information recording apparatus that switches a signal level at an integral multiple of a predetermined basic period according to first information. First modulation signal generating means for generating one modulation signal, position detecting means for detecting relative position information of the pickup on a disk-shaped recording medium, and generating the second information in accordance with the relative position information A second information generating means, a second modulating means for changing a part of the modulation signal according to the second information, and an optical modulating means for modulating the laser light according to the output of the second modulating means.

According to the present invention, the following operations are performed. The second modulating means is configured by superimposing the second information on a modulated signal, a signal superimposing means for creating a superimposed signal, and a timing correcting means for creating a second modulated signal by correcting the timing of the superimposed signal, It acts to superimpose signals and correct timing. Further, the signal superimposing means divides a pulse exceeding a predetermined time width into two or more pulses according to an output of the pattern detecting means and the second information, and a pattern detecting means for detecting a pattern of the modulation signal. It is composed of pulse dividing means for outputting, and operates to perform pattern detection and pulse division.

Further, in the optical information recording method of the present invention, a first modulation signal which changes at intervals of an integral multiple of a predetermined period is produced from the first information, and a relative laser beam on the optical information recording medium is produced. Detecting the position, generating second information according to the relative position, detecting a portion of the first modulation signal that has not changed for a predetermined length, and detecting a signal change of the first modulation signal according to the second information. A second modulation signal is produced in which a portion that does not exist is changed, and acts to modulate the laser beam according to the second modulation signal.

Further, the change of the portion where there is no signal change is performed so as to divide a recording pulse exceeding a predetermined length into two pulses and one space.

Further, in the optical information recording medium of the present invention, the first information is mainly recorded by changing the length and the position of the pit, and the second information is mainly recorded in a predetermined portion of the pit. Are recorded in such a manner that pits exceeding the length are divided into two, and the second information acts to form a two-dimensional pattern on the optical information recording medium.

[0012]

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

FIG. 1 is a block diagram showing an optical disc recording apparatus 1 according to an embodiment of the present invention. The optical disc recording apparatus 1 exposes a master disc 2 and records audio data SA output from a digital audio tape recorder 3. In the manufacturing process of the optical disk, a mother disk is created by developing the disk master 2 and then electroforming to create a stamper from the mother disk. Further, in the optical disk manufacturing process, a disk-shaped substrate is formed from the stamper thus formed, and a reflective film and a protective film are formed on the disk-shaped substrate to form a compact disk.

That is, in the optical disk device 1,
The spindle motor 14 drives the disk master 2 to rotate, and outputs an FG signal FG whose signal level rises at every predetermined rotation angle from an FG signal generation circuit held at the bottom. The spindle servo 13 drives the spindle motor 14 so that the frequency of the FG signal FG becomes a predetermined frequency in accordance with the exposure position of the master disc 2, thereby rotating the master disc 2 under the condition of a constant linear velocity. .

The FG signal is also connected to a rectangular coordinate position detection circuit 5. The Cartesian coordinate position detection circuit 5 outputs the position currently being recorded as position information X and Y in Cartesian coordinates by counting the FG signal.

The position information X and Y are sent to a character signal generation circuit 6.
Is output to The character signal generation circuit 6 is, for example, a ROM
(Read only memory), with X and Y as address inputs and a signal SE as output. From this circuit, corresponding to the position currently being recorded,
Character or graphic information (second information) that can be confirmed when the disk surface is visually observed is generated as a signal SE.

The recording laser 9 is composed of a gas laser or the like, and has a laser beam L1 for exposing the master disc.
Inject The optical modulator 10A and the optical modulator 10B are configured by an electroacoustic optical element. The voltage conversion circuit 15 converts the level of the second information SE and outputs an analog optical output control signal SF. That is, when the second information SE is logic “0”, the voltage conversion circuit 15 outputs a value of 1.0 as the light output control signal SF, and when the second information SE is logic “1”. , The light output control signal S
0.85 is output as F. The light modulator 10A changes the output of the laser beam L1 according to the light output control signal SF. That is, when the light output control signal SF is 1.0, the laser beam L1 is passed so that the output of the laser beam L2 becomes 100%. Conversely, when the light output control signal SF is 0.85, the laser beam L2
Is attenuated so that the output of the laser beam L becomes 85%.

As described above, the optical modulator 10A makes the optical output 100% by following the optical output control signal SF.
And a laser beam L2 which fluctuates between 85%.
Next, the laser beam L2 thus obtained is turned on and off by the optical modulator 10B. That is, when the signal SD from the second modulation circuit 8 is logic "1", the laser beam L3
Is turned on, and conversely, when the signal SD is logic "0", the laser beam L3 is turned off.

The mirror 11 bends the optical path of the laser beam L3 and emits it toward the disk master 2. The objective lens 12 focuses the light reflected by the mirror 11 on the disk master 2. These mirror 11 and objective lens 12
Are sequentially moved in the outer peripheral direction of the disk master 2 in synchronization with the rotation of the disk master 2 by a sled mechanism provided on a pickup (not shown), whereby the exposure position by the laser beam L3 is sequentially moved in the outer peripheral direction of the disk master 2. Displace.

Thus, in the optical disk apparatus 1, a spiral track is formed by the movement of the mirror 11 and the objective lens 12 while the disk master 2 is driven to rotate, and the EFM signal SB and the first and second characters of characters and figures are formed on this track. Pits are sequentially formed corresponding to the two information SEs.

The modulation circuit 4 includes a digital audio
Audio data S output from the tape recorder 3
Receiving A, the corresponding subcode data is added to the audio data SA. Further, the modulation circuit 4 performs data processing on the audio data SA and the subcode data in accordance with the format of the compact disc, and generates a modulation signal SB. That is, the modulation circuit 4 performs an interleave process and an EFM modulation process after adding an error correction code to the audio data SA and the subcode data. As a result, the modulation circuit 4 sets a period (period 3T to 11T) that is an integral multiple of the basic period T for the pit formation.
An EFM modulated signal SB whose signal level changes at T) is output.

The second modulation circuit 8 receives the EFM modulated signal SB and the second information SE as inputs, and converts the second information SE into an EFM signal so as not to disturb recording information to be recorded as an EFM signal.
The signal SD is superimposed on the FM signal SB and output.

Such a second modulation circuit 8 is realized by a configuration as shown in FIG. Here, the PLL circuit 60 is EFM
A channel clock CK that changes for each minimum change unit of the signal SB is reproduced and supplied to the signal superposition circuit 81 and the timing correction circuit 82. In the signal superposition circuit 81,
If the second information SE is logic 0, the input E
Without changing the FM signal SB, the signal S
Output as C. Conversely, when the second information SE is logic 1, the length of the pit formed from the signal pattern of the input EFM signal is checked, and the length of the formed pit is 9T or more. If it is determined that there is, a signal originally recorded as one pit is converted so as to be replaced with two pits and one space and output as a signal SC.

The signal SC on which the second information SE is superimposed as described above is sent to the timing correction circuit 82, and the signal change timing is finely adjusted so as to improve the quality of the reproduced signal (reduce jitter). , And a signal SD.

As described above, the second information SE is recorded on the master disk 2 by the optical modulator 10A as a change in the amount of the laser beam L2. At the same time, the signal is converted by the second modulation circuit 8 according to the second information SE, and the optical modulator 10B turns on and off the laser beam according to the signal, thereby recording on the master disk 2. That is, since the signal is doubly modulated in accordance with the second information SE and recorded on the disk master 2, it is possible to record the second information SE with a higher contrast than in the conventional method. Also,
Since the change timing of the recording signal is corrected by the timing correction circuit 82, it is possible to manufacture a good disk with little jitter.

FIG. 3 shows the configuration of the signal superimposing circuit 81 for performing the above signal conversion. In this figure, an EFM signal SB operates with a channel clock CK and is input to 13 latch circuits 29A to 29M connected in series. EFM is provided by 13 latch circuits 29A to 29M.
The signal SB is sampled at the timing of the channel clock CK, and a change pattern of the EFM signal SB is detected from the sampling results of 13 consecutive points. That is, for example, when a latch output of “0011111111100” is obtained, it can be determined that the pattern is a pattern in which a pit having a length of 9T is formed.

The AND gates 20 to 22 detect pits having a length of 9T or more from the outputs of the 13 latch circuits 29A to 29M. That is, the AND gate 20 outputs “0011111” from the outputs of the thirteen latch circuits 29A to 29M.
If it is "111100", it outputs a logic "1" to detect that a pit having a length of 9T is recorded.
Similarly, the AND gate 21 has 13 latch circuits 2
The output of 9A to 29M is “0111111111100”
By outputting a logic “1” when
Pit is recorded. When the outputs of the 13 latch circuits 29A to 29M are "0111111111110", the AND gate 22 outputs a logic "1" to detect that a pit having a length of 11T is recorded.

The output signal MD of the OR gate 23 is obtained by calculating the logical OR of the outputs of the AND gates 20, 21 and 22 so that when any of the pits having a length of 9T, 10T or 11T is recorded, the logic "1" is output. Signal M
D is output.

The output of the latch circuit 29F is EF
The M signal SB appears delayed by seven clocks.

Therefore, for example, when a pit having a length of 9T is recorded, when the output of the latch circuit 29F outputs a 9T pit signal, the signal MD is substantially at the logical center of the 9T pit signal. 1].

A NAND (Nand) gate 24 calculates the logical product of the second information SE from the character signal generating circuit 6 and the pit detection signal MD of 9T or more from the OR gate 23, and inverts the logic and outputs the inverted signal. I do. That is, if the second information SE from the character signal generation circuit 6 is logic “0”, the NAND
The output of the (NAND) gate 24 is always logic "1".
The AND gate 25 calculates and outputs the logical product of the NAND (Nand) gate 24 and the output of the latch circuit 29F. Therefore, when the second information SE from the character signal generating circuit 6 is logic "0", the output of the latch circuit 29F appears as the output of the AND gate 25 as it is.

That is, when the second information SE from the character signal generation circuit 6 is logic "0", the output of the AND gate 25 is simply the input EFM signal SB delayed.

On the other hand, when the second information SE from the character signal generation circuit 6 is logic "1", the output of the AND gate 25 is forced when the pit detection signal MD of 9T or more is logic "1". Is logically changed to "0". Therefore, when a pit of 9T or more is detected, the signal is converted into a signal such that the center portion becomes 0.

The latch circuit 26 shapes the waveform by latching the output of the AND gate 25 in channel clock CK units, and sends it to the timing correction circuit 82 as an output signal SC. As a result, for example, the length 9 shown in FIG.
The pulse of T is recorded after being changed into two pulses of length 4T as shown in FIG. 4D and a blank of 1T at the center thereof. Similarly, a pulse having a length of 10T is changed into a pulse having a length of 5T, a blank having a length of 1T, and a pulse having a length of 4T and recorded. When a pit is recorded according to such a pulse, for example, as shown in FIGS. 4B and 4E,
It is considered that pits according to each pulse are recorded.

FIGS. 4C and 4F schematically show expected reproduced signals. By using the method according to the present embodiment, two pits and a pit row recorded as a 1T blank at the center thereof generate a reproduction signal as shown in FIG. 4F when read by a normal pickup. Such a reproduced signal is binarized by comparing the level with a normal threshold level ST. At this time, it can be seen that the timing of crossing the threshold level ST is not different from that in FIG. 4C. Therefore, it can be understood that jitter is not deteriorated even when a pit of 9T or more is divided into two and recorded by the method described above.
Therefore, it is possible to reproduce the information recorded as the EFM signal SB without affecting the information.

FIG. 5 shows a reproduced signal actually obtained by performing an experiment of dividing the pit into two parts in this manner. As expected, it can be seen that there is no effect on the signal near the threshold level.

As described above, the second information SE can be recorded by dividing a pit of 9T or more into two parts. Comparing the pit strings recorded in this manner (for example, comparing FIGS. 4B and 4E), when the pits of 9T or more are divided into two, the total area of the pits is reduced. I understand. Therefore, when the second information SE is set to a different value in a certain area on the disc than in other areas, and a pit as described above is recorded, such an area has a pit having a total area of another pit. It will be formed differently from the region. When a human observes such a disk visually, a light amount proportional to the total area of the pits is observed. Therefore, a person observing visually observes only a specific area on the disk surface to have a different color according to the second information SE. In this way, it is possible to record a pattern such as a character or a picture on the disk surface without affecting the EFM signal SB.

In the method described in the present embodiment, the intensity of the recording laser beam L2 is modulated in advance by the second information SE. That is, as described above, when the second information SE is logic "1", the intensity of the laser beam L2 is reduced to 85%, and when the second information SE is logic "0", The intensity of the laser beam L2 is 100%
Remains. Here, the width of the pit recorded on the disk changes according to the intensity of the laser beam. Therefore,
When the second information SE is logic "1", the width of the pit becomes narrow because the intensity of the laser beam is reduced. Further, as described above, when the second information SE is logic “1”, 9T
The above pit is divided into two. Since these two effects both act to reduce the total area of the pits, the second information SE recorded on the optical disc according to the present embodiment can be more clearly observed than the conventional method. There is.

FIG. 6 shows, as an illustration, the state of the pits recorded in this manner according to the present embodiment. When the second information SE is logic "0", pit division is not performed and the output of the recording laser is 100%, so that a normal pit train (FIG. 6A) is recorded. However, if the second information SE is logic “0”, 9T
Since the pit having the above length is divided into two and the output of the recording laser is reduced to 85%, the width of the pit is relatively reduced. That is, the pit width (W
1) is wider than the pit width (W2) in the case of FIG. 6B.

When the pit width is changed in this way, there is a possibility that a jitter occurs in the reproduced signal. Also, the reproduced signal from the optical disk has intersymbol interference from the patterns recorded before and after, and this causes jitter. In the present embodiment, in order to solve these problems and produce a high-quality disc, a signal obtained from the signal superimposing circuit 81 is converted to a timing correction circuit 82.
And the signal S in which the position of the change point of the recording signal is corrected
Create D. In the present embodiment, the information obtained from the digital audio tape recorder 3 and the information obtained from the character signal generation circuit 6 are obtained by the optical modulator 10B turning on and off the laser beam L2 according to the signal SD obtained in this manner. Both of the second information SE are recorded on the disk surface.

The timing correction circuit 82 detects a change pattern of the signal SC. At the same time, the second information SE is sent to the timing correction circuit 82. Therefore, the timing correction circuit 82 can perform the timing correction in accordance with both the information on the change pattern of the signal SC during recording and the laser power during recording.

The timing correction circuit 82 outputs a modulated signal SD for which the edge position has been finely adjusted in accordance with both of the two types of information obtained in this manner. That is, in the timing correction circuit 82, the change timing of the output signal SD indicates both the laser power during recording (85% or 100% value) and the change pattern of the signal SC during recording (pit length and space length change). Modulated signal SD that is delicately adjusted according to
Is output as

That is, when the modulated signal SD that has passed through the timing correction circuit 82 is recorded with a predetermined laser power determined by the second information SE and the resulting disk is reproduced, the reproduced signal is converted into a predetermined binary signal. By binarizing at the level, a signal containing no jitter can be obtained.

Further, at all recording laser powers,
Since the correction is always performed by the timing correction circuit 82, the problem that the pit quality is slightly different for each pattern is eliminated, and a disc with reduced overall jitter of the reproduced signal can be created. Further, in the present embodiment, since the edge position is adjusted for each recorded pattern, it is possible to remove jitter depending on the pattern, that is, jitter due to intersymbol interference.

FIG. 7 is a block diagram showing the structure of the timing correction circuit 82. The modulation signal SC and the second information SE supplied to the timing correction circuit 82 are supplied to the rising edge correction circuit 17A and the falling edge correction circuit 17A.
B.

The rising edge correction circuit 17A has the configuration shown in FIG.
As shown in FIG.
The latch circuits 19A to 19M are connected in series, and the EFM modulation signal SB is input to this series circuit. As a result, the rising edge correction circuit 17A samples the signal SC at the timing of the channel clock CK, and detects a change pattern of the signal SC from the sampling results of 13 consecutive points. That is, for example, "000111100000
When the latch output of "1" is obtained, it can be determined that the change pattern is a pattern in which a space of 5T in length is followed by a pit of 4T in length. Similarly, when a latch output of “0011111000001” is obtained, it can be determined that the pattern is a change pattern in which a space of 5T in length is followed by a pit of 5T in length.

The correction value table 50 is formed by a read-only memory storing a plurality of correction data, and the latch outputs of the latch circuits 19A to 19M are input as the lower 13 bits of the address. The second information SE is input as the upper bits of the address. Second information SE
Reflects the optical power of the laser currently recording. That is, the correction value table 50 outputs the correction value data DF corresponding to both the change pattern of the modulation signal SB and the recording power. The monostable multivibrator (MM) 51 receives a latch output from the central latch circuit 19G among the 13 latch circuits connected in series,
Based on the rising timing of the latch output, a rising pulse signal whose signal level rises for a predetermined period (a period sufficiently shorter than the period 3T) is output.

The delay circuit 52 has a tap output of 15 stages, and the delay time difference between the taps is set to the resolution of the timing correction of the modulation signal in the edge position correction circuit 17A. The delay circuit 52 sequentially delays the rising pulse signal output from the monostable multivibrator 51 and outputs the delayed signal from each tap. The selector 53 selects and outputs the tap output of the delay circuit 52 according to the correction value data DF, and thereby selectively outputs the rising pulse signal SS whose delay time changes according to the correction value data DF.

That is, the rising edge correction circuit 17
A is a rising edge signal in which the signal level rises in response to the rising of the signal level of the signal SC, and the delay time of each rising edge with respect to the signal SC changes according to the change pattern of the signal SC and the laser power during recording. Generate SS.

As described above, the rising edge correction circuit 17A detects the pattern of the pits formed on the optical disc and the laser power during recording in the range of the period 12T in units of the basic period T. Then, the rising edge signal SS is generated according to the recording pattern and the laser power during recording.

The falling edge correction circuit 17B is different from the rising edge correction circuit 17A except that the monostable multivibrator 51 operates based on the falling edge of the latch output and that the contents of the correction value table 50 are different. Is configured the same as

That is, the falling edge correction circuit 17B also detects the pattern of the pits formed on the optical disc and the laser power during recording in the range of the period 12T in which the basic period T is used as a unit. The falling edge signal SR is generated by correcting the falling edge timing of the signal SC corresponding to the timing of ending the laser beam irradiation accordingly.

Flip-flop (F / F) 18 (FIG. 7)
Synthesizes and outputs the rising edge signal SS and the falling edge signal SR. That is, the flip-flop 18 inputs the rising edge signal SS and the falling edge signal SR to the set terminal S and the reset terminal R, respectively, so that the signal level rises at the rise of the signal level of the rising edge signal SS and then falls. A modulation signal SD whose signal level falls at the rise of the signal level of the edge signal SR is generated.

As a result, in the signal SD, the timing of the rising edge and the falling edge is output as a signal SD corrected in accordance with the recording pattern (determined by the length of the pit and the space) and the recording power.

According to the output signal SD of the timing correction circuit 82 obtained as described above, the output level becomes 100%
The laser beam L2, which changes between 85% and 85%, is on / off controlled by the optical modulator 10B,
3 is applied to the disk master 2.

FIG. 9 shows the configuration of the orthogonal coordinate position detection circuit 5 used when generating the second information SE recorded as described above. In the figure, one-turn counting circuit 3
The 0 and track count circuit 31 are cleared at the start of recording by a clear pulse CLR from a system controller (not shown), and their initial values are zero. As the FG signal from the spindle motor 14, for example, 4200 pulses are output each time the spindle motor 14 makes one rotation. This pulse is output from the one-turn counting circuit 3
It is counted 4200 by 0 and output as a count value RX. The count value RX takes a value from 0 to 4199, and is incremented by one every time the spindle motor 14 rotates 1/200 times, and thus represents the rotation angle of the spindle motor 14. When the spindle motor 14 makes one rotation, this counter is reset. Each time this reset occurs, a pulse is generated as the signal RT, and this pulse is input to the track count circuit 31.

The track count circuit 31 outputs 1 for one rotation.
By counting the pulse signal RT, the track number TK currently being recorded is output. For example, when recording a compact disc (CD), recording starts at a radius of 23 mm, and a track pitch of 1.6 to a radius of 58 mm.
Since recording is performed in microns, the value of the track count circuit 31 changes from 0 to about 22,000 counts.

As described above, the count value RX of the one-turn counting circuit 30 and the count value TK of the track counting circuit 31 correspond to the angle information and the radius information when the position currently being recorded is represented by polar coordinates. I have. Therefore, the coordinate conversion circuit 32 to which these two values are input can calculate and output the position information X and Y in the rectangular coordinate system. The position information X and Y in the rectangular coordinate system are sent to the character signal generation circuit 6 after being converted in this way.

The coordinate conversion circuit 32 is realized, for example, by the configuration shown in FIG. In this figure, for the CPU 33,
The input ports 34 and 35 are connected via the data bus, and the output ports 36 and 37 are connected simultaneously.
One-turn counting circuit 30 and track counting circuit 31
Are supplied to the input ports 34 and 35, respectively, so that the CPU 33 can take in the respective values.

The CPU 33 calculates the position information X and Y in the rectangular coordinate system from these two values according to the following equations (1) and (2), and outputs them to the output ports 36 and 37.

[0061]

X = A · (TK · Tp + Tb) · cos (2π
・ (RX / 4200)) + B

[0062]

## EQU2 ## Y = A 数 (TK ・ Tp + Tb) ・ sin (2π
(RX / 4200)) + B Here, A and B are constants determined by the size and position of the coordinate system, Tb represents the radius of the recording start, and Tp represents the track pitch. As a result of the above-described conversion, the position information represented by the polar coordinate system (RX, TK) as shown in FIG. 11A is converted into the orthogonal coordinate system (X, Y) as shown in FIG. 11B.

The character signal generating circuit 6 is constituted by a ROM (Read Only Memory) or the like. The output (X, Y) of the orthogonal coordinate position detecting circuit 5 is used as an address input, and the output of the memory is used as information SE of characters and figures. It is made to output as. For example, when it is desired to draw a pattern as shown in FIG. 12A on a disk, a pattern as shown in FIG. 12B is recorded in a memory inside the character signal generating circuit 6.

As described above, the character signal generating circuit 6
An image to be drawn is binarized and recorded in an internal ROM using a rectangular coordinate system. The information recorded in the ROM is converted and input in real time by the orthogonal coordinate position detecting circuit 5 in the coordinate system, so that the information is read out as it is and sequentially recorded on the disk as a change in the recording laser power and division of long pits. It is recorded.

The voltage conversion circuit shown in FIG. 13 (15 in FIG. 1)
Then, the second information SE is read-only memory (RO
M) 44 as an address signal. ROM
44, the recording power of the laser is 0 or 1 in advance.
Is calculated in accordance with the second information SE having the value of, and the value is recorded. As the simplest example, an example in the case where the laser power described in the first half of the present embodiment is changed from 100% to 85% will be described. For example, if the value of the second information SE is 0, a laser power of 100% is expected, so a numerical value 100 is recorded corresponding to the address 0. When the second information SE corresponds to 1, a laser power of 85% is expected, so a numerical value 85 is recorded.

Of course, the above example is based on the simple assumption that 100% power is output when the output of the ROM 44 is 100. Actually, it is necessary to determine the value to be recorded in the ROM 44 in consideration of the conversion gain of the D / A converter 45 and the conversion efficiency of the optical modulator 10A.
Further, the output power of the laser may not have a linear relationship with the input voltage to the optical modulator 10A. In such a case, it is necessary to record a suitably changed value in the ROM 44.

The output value of the laser read from the ROM 44 as described above is converted into an analog voltage value SF by the D / A converter 45, and is supplied to the optical modulator 10A to reduce the output power of the laser beam L2. Has been made to control.

FIG. 14 is a process chart for explaining the generation of the correction value table 50 used for the edge timing correction. The correction value table 50 includes a correction circuit 17A for the rising edge and a correction circuit 17 for the falling edge.
B exists in both. By properly setting these tables, even when the recording laser power changes according to the graphic or character information SE, the clock CK can be used.
It is possible to manufacture a disk in which a reproduction signal crosses a predetermined slice level at a correct timing synchronized with the reproduction signal (ie, the jitter is small).

These correction value tables 50 are generated in the same manner except that the conditions for generation are different. Therefore, only the rising edge correction circuit 17A will be described below.

In the steps described below, a master disc 2 for evaluation is created by the optical disc apparatus 1, and a correction value table 50 is set based on the reproduction result of the optical disc 41 created from the master disc 2.

Here, at the time of creating the master disc 2 for evaluation, a correction value table 50 for evaluation reference is set in the optical disc apparatus 1. The correction value table 50 for the evaluation reference is formed by setting the correction value data DF so that the selector 53 (FIG. 8) always selects and outputs the center tap output of the delay circuit 52. As a result, in this step, the effect of the timing correction circuit 82 is set to have no effect.

Thus, the timing correction circuit 82
Is sent to the optical modulator 10B, and the master disc 2 is exposed to the laser beam L2 of 100% power in the same manner as in the case of normal compact disc production.

After the disk master 2 thus exposed is developed, electroforming is performed to form a mother disk, and a stamper 40 is formed from the mother disk. Further, an optical disk 41 is formed from the stamper 40 in the same manner as in a normal compact disk forming process.

In FIG. 14, the optical disk player 4
2 reproduces the evaluation optical disk 41 created as described above in accordance with an instruction from the computer 44. At this time, the optical disk player 42 switches the operation under the control of the computer 44, and outputs a reproduction signal RF whose signal level changes according to the amount of return light obtained from the optical disk 41 to the digital oscilloscope 43 from a built-in signal processing circuit. .

At this stage, the binarization level of the reproduction signal is not always predetermined as in the case of a normal optical disk. In addition, since pit formation is not completely performed ideally, jitter is observed.

The digital oscilloscope 43 performs an analog-to-digital conversion process on the reproduced signal RF at a sampling frequency 20 times the channel clock, and outputs a digital signal obtained as a result to the computer 44.

The computer 44 controls the operations of the optical disk player 42 and the digital oscilloscope 43, processes the digital signal output from the digital oscilloscope 43, and calculates the correction value data DF.

Finally, the computer 44 drives the ROM writer 45 to sequentially store the calculated correction value data DF in the read only memory (ROM), thereby forming the correction value table 50. An optical disc is finally manufactured based on the correction value table 50 thus completed.

FIG. 15 is a flowchart showing a processing procedure for producing the correction value data DF in the computer 44. In this processing procedure, the computer 44 proceeds from step SP1 to step SP2, where the jitter detection result Δr (p, b), the number of jitter measurements n (p,
b) is set to the value 0. Here, the computer 44
The jitter detection result Δr for each combination of the pit length p and the pit interval b before and after the edge for which jitter is to be detected.
(P, b) is calculated, and the number of jitter measurements n (p, b)
Count. Therefore, the computer 44 determines in step SP2 that all of these jitter detection results Δr
(P, b) and the number of jitter measurements n (p, b) are set to initial values.

Subsequently, the computer 44 proceeds to step SP
In step 3, the digital signal output from the digital oscilloscope 43 is compared with a predetermined slice level VL to generate a digital binary signal obtained by binarizing the reproduction signal RF. In this process, the computer 44 binarizes the digital signal so that a value equal to or higher than the slice level is 1 and a value lower than the slice level is 0.

Subsequently, the computer 44 proceeds to step SP
Then, the reproduction clock is generated from the binarized signal composed of the digital signal. Here, the computer 44
The operation of the PLL circuit is simulated by arithmetic processing on the basis of the digitized signal, thereby generating a reproduced clock.

Further, in the following step SP5, the computer 44 samples the binarized signal at the timing of each falling edge of the reproduced clock generated in this way, and thereby decodes the modulated signal (hereinafter the decoded signal). The modulated signal is called a decoded signal).

Subsequently, the computer 44 proceeds to step SP
6, and from the rising edge of the binarized signal,
The time difference e up to the falling edge of the reproduction clock closest to this edge is detected, and the jitter at this edge is measured in time. Then the computer 44
Is the pit length p before and after the decoded signal for the edge measured in step SP6 in step SP7.
And the pit interval b are detected.

The computer 44 subsequently proceeds to step SP
In step 8, the time difference e detected in step SP6 is added to the jitter detection result Δr (p, b) corresponding to the preceding and following pit length p and pit interval b, and the corresponding number of jitter measurements n (p, b) ) Is incremented by the value one. Subsequently, the computer 44 proceeds to step SP9, determines whether or not time measurement has been completed for all rising edges, and returns a negative result here to step SP5.

Thus, the computer 44 repeats the processing procedures of steps SP5-SP6-SP7-SP8-SP9-SP5, accumulatively adds the time-measured jitter detection results for each change pattern appearing in the reproduction signal RF, and adds the results. Count the number. Note that this change pattern corresponds to the latch circuit 19A in the rising edge correction circuit 17A.
In order to correspond to the number of stages of １９19M, the edge is classified by a period of six samples before and after the jitter detection target edge based on the basic period T (a period of 12T in total).

When the time measurement of the jitter is completed for all the edges in this way, the computer 44 obtains a positive result in step SP9,
The process proceeds to step SP10, where the time-measured jitter detection result is averaged for each change pattern appearing in the reproduction signal RF. That is, since the jitter detected in step SP6 is affected by noise, the computer 44 averages the jitter detection result in this way, and improves the measurement accuracy of the jitter.

After averaging the jitter detection result in this way, the computer 44 subsequently proceeds to step SP11
The correction value data DF can be generated for each change pattern from the detection result. Here, the correction value data DF is calculated by executing the following equation (3), with the delay time difference between taps in the delay circuit 52 being τ.

[0088]

Hr1 (p, b) = Hr0 (p, b) -a / τ
・ Δr (p, b)

Here, Hr1 (p, b) is a tap of the delay circuit 52 selected by the correction value data DF, and a value of 0 is a center tap. Hr0
(P, b) is a tap of the delay circuit 52 selected by the correction value data DF that is an initial value. In this embodiment, Hr0 (p, b) is set to the value 0. Become. A is a constant. Here, in the present embodiment, a is set to a value of 1 or less (for example, 0.7 or the like), so that the correction value data is surely converged even if there is an influence of noise or the like.

When the computer 44 stores the correction value data DF generated in this manner in a predetermined address area of the ROM writer 45, the computer 44 proceeds to step SP12 and ends this processing procedure. Subsequently, the computer 44 executes the same processing procedure for different recording powers. Finally, burning is performed by the ROM writer 45 to complete the correction value table 50 inside the rising edge correction circuit 17A.

Further, the same processing is executed for the falling edge of the digital binary signal, whereby the correction value table 50 inside the falling edge correction circuit 17B is completed.

The correction value table 5 completed as described above
The optical disk is manufactured in the optical disk device 1 by using 0. In the optical disk completed in this way, even if the recording power is changed in two steps according to the second information SE, the pits have an ideal length in accordance with the power change, and an extremely small jitter is generated over the entire surface of the disk. Reproduced by.

In the above-described embodiment, the laser power is changed in two steps. However, the laser power is changed slowly, for example, the laser power is changed in about eight steps, and the laser power is changed in two steps. It may be configured to switch to. In addition, the timing correction circuit 82 always performs appropriate correction corresponding to the changing laser power.
, The correction value data in the timing correction circuit 82 may have a large number corresponding to the power. With such a configuration, it is possible to make the change in laser power larger than before, and as a result, it is possible to record character and graphic information that can be visually observed more clearly on the disk surface. Become.

The above-described optical information recording apparatus of the present embodiment switches the first modulated signal SB by switching the signal level in a cycle that is an integral multiple of the predetermined basic cycle T in accordance with the first information SA. A first modulation signal generating means (modulation circuit 4) for generating, a position detection means (orthogonal coordinate position detection circuit 5) for detecting relative position information of the pickup on the optical information recording medium (disk master 2), A second information generating means (character signal generating circuit 6) for generating second information SE according to the position information; and a modulation signal SB according to the second information SE.
Modulating means (second modulating circuit 8) for changing a part of
And the laser light L2 according to the output SD of the second modulating means 8.
Is constituted by an optical modulation means (optical modulator 10B) for modulating. Therefore, in the optical information recording apparatus according to the present embodiment, for example, a region such as a CD or DVD is recorded in an area where information (first information SA) such as music or video defined by a standard such as CD or DVD is recorded. It is possible to record the second information SE that can be visually confirmed and is not defined in the standard.

Further, the second modulating means (second modulating circuit 8) of the present embodiment superimposes the second information SE on the modulated signal SB to create a superimposed signal SC (signal superimposing circuit 81). And a timing correction means (timing correction circuit 82) for correcting the timing of the superimposed signal SC to generate the second modulated signal SD. The signal superimposing means 81
Are pattern detection means (latch circuits 29A to 29M, AND gates 20 to 2) for detecting the pattern of modulation signal SB.
2. OR gate 23) and output MD of pattern detection means
Pulse dividing means (NAND gate 24, AND gate 25, latch circuit 26) for dividing a pulse exceeding a predetermined time width into two or more pulses SC and outputting the divided pulse according to the second information SE. . Therefore, it is possible to record the second information SE having a higher contrast than before. Also, an optical disk having better signal characteristics than the conventional one can be obtained.

Further, in the optical information recording method of the present embodiment, the first modulation signal SB which changes at intervals of an integral multiple of the predetermined period T from the first information SE is produced, and the optical information recording medium of the laser beam is produced. The relative position on the (master disc 2) is detected, the second information SE is generated in accordance with the relative position, the portion of the first modulation signal SB that has not changed for a predetermined length is detected, and the second information SE is detected. First modulation signal SB according to SE
Modulated signal SD obtained by changing a portion where there is no change in signal
And a laser beam L2 according to the second modulation signal SD.
Is modulated. Therefore, the optical information recording method according to the present embodiment uses the information (first information S) such as music and video defined by the standards such as CD and DVD.
In addition to A), it is possible to record, in the same disk area, the second visible information SE not defined in the standards such as CD and DVD.

Further, the portion where there is no signal change is changed so that a recording pulse exceeding a predetermined length is divided into two pulses and one space. Therefore, clear second information can be recorded.

In the optical information recording medium of the present embodiment, the first information SA is recorded mainly by changing the length and position of the pit, and the second information SE is mainly recorded in the pit. Of these, pits exceeding a predetermined length are recorded so as to be divided into two, and the second information SE forms a two-dimensional pattern on the optical information recording medium (master disc 2). . Therefore, for example, in addition to information (first information SA) such as music and video defined by standards such as CD and DVD, second information SE not defined by standards such as CD and DVD is recorded. It is possible to obtain a medium. As the second information SE, it is also possible to record graphic information such as characters and graphics that can be visually confirmed in the signal portion of the disc, and it is possible to obtain a disc with added value. Further, the graphic information of the optical information recording medium according to the present embodiment can be clearly confirmed as compared with the conventional method.

[0099]

According to the optical information recording apparatus of the present invention, the first modulated signal is generated by switching the signal level in a cycle of an integral multiple of a predetermined basic cycle in accordance with the first information. Modulation signal producing means, position detecting means for detecting relative position information of the pickup on the optical information recording medium, second information generating means for generating the second information according to the relative position information, The second modulation means changes a part of the modulation signal according to information, and the light modulation means modulates the laser light according to the output of the second modulation means.
Therefore, in the optical information recording apparatus of the present invention, for example, a CD or DV
CD or DVD in an area where information (first information) such as music and video defined by standards such as D is recorded.
Thus, it is possible to record the second information which is not specified in the standard and can be visually confirmed.

Further, the second modulating means of the present invention superimposes the second information on the modulated signal to generate a superimposed signal, and generates a second modulated signal by correcting the timing of the superimposed signal. It is composed of timing correction means. Further, the signal superimposing means divides a pulse exceeding a predetermined time width into two or more pulses according to an output of the pattern detecting means and the second information, and a pattern detecting means for detecting a pattern of the modulation signal. It is composed of pulse dividing means for outputting. Therefore, it is possible to record the second information having a higher contrast than the conventional method. Further, there is an effect that an optical disk having better signal characteristics than the conventional one can be obtained.

Further, according to the optical information recording method of the present invention, a first modulation signal that changes at intervals of an integral multiple of a predetermined period is produced from the first information, and the relative position of the laser beam on the optical information recording medium is adjusted. , To generate second information according to the relative position, in the first modulation signal, to detect a portion that does not change for a predetermined length, according to the second information, there is no signal change in the first modulation signal It is configured to produce a second modulation signal with a part changed, and to modulate the laser beam according to the second modulation signal. Therefore, the optical information recording method of the present invention can be used in addition to information (first information) such as music and video defined by standards such as CDs and DVDs, as well as C information.
There is an effect that it is possible to record the second visible information that is not defined in the standards such as D and DVD in the same disk area.

Further, the portion where there is no signal change is changed so that a recording pulse exceeding a predetermined length is divided into two pulses and one space. Therefore, there is an effect that clear second information can be recorded.

Further, in the optical information recording medium of the present invention, the first information is mainly recorded by changing the length and the position of the pit, and the second information is mainly recorded in a predetermined portion of the pit. Are recorded in such a manner that pits exceeding the length are divided into two, and the second information forms a two-dimensional pattern on the optical information recording medium. Therefore, for example, in addition to information (first information) such as music and video defined by standards such as CD and DVD, a medium that records second information not defined by standard such as CD and DVD is used. It is possible to obtain. As the second information, it is also possible to record graphic information such as characters and graphics that can be visually confirmed in the signal portion of the disc, and it is possible to obtain a disc with added value. Further, the graphic information of the optical information recording medium according to the present invention has an effect that it can be clearly confirmed as compared with the conventional method.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a second modulation circuit of the optical disk device of FIG.

FIG. 3 is a block diagram illustrating a configuration of a signal superimposing circuit in the second modulation circuit of FIG. 2;

4 is a diagram schematically showing an output signal of a second modulation circuit of FIG. 2, a pit obtained as a result, and a reproduction signal expected from such a pit, and FIG. 4A shows an output signal S;
4B is a recording pit, FIG. 4C is a reproduction signal, FIG. 4D is a two-part output signal SD, FIG. 4E is a two-part recording pit, FIG.
F is a reproduction signal.

FIG. 5 is a diagram showing a reproduced waveform when an output signal of the second modulation circuit of FIG. 2 is recorded on an optical disc.

FIGS. 6A and 6B are diagrams schematically showing the state of pits recorded on the optical disc of the present embodiment. FIG. 6A shows normal recording pits, and FIG. 6B shows two-divided recording pits.

FIG. 7 is a configuration diagram illustrating a configuration of a timing correction circuit in the second modulation circuit of FIG. 2;

FIG. 8 is a block diagram illustrating a configuration of a rising edge correction circuit in the timing correction circuit of FIG. 2;

FIG. 9 is a block diagram showing a configuration of a rectangular coordinate position detection circuit in the optical disk recording device of FIG. 1;

FIG. 10 is a block diagram showing a configuration of a coordinate conversion circuit in the orthogonal coordinate position detection circuit of FIG. 9;

11 is a diagram showing a state of coordinate conversion in the coordinate conversion circuit of FIG. 5, wherein FIG. 11A is a polar coordinate system and FIG. 11B is a rectangular coordinate system.

12A and 12B are diagrams for explaining the operation of the character signal generation circuit in FIG. 1; FIG. 12A shows a pattern to be drawn on a disk, and FIG. 12B shows a pattern recorded in a memory;

13 is a block diagram illustrating a configuration of a voltage conversion circuit in FIG.

FIG. 14 is a process chart showing a process of creating a correction value table in the optical disc device of FIG. 1;

FIG. 15 is a flowchart illustrating a processing procedure of a computer in the process of FIG. 14;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk apparatus, 2 ... Disk master, 3 ... Digital audio tape recorder, 4 ... Modulation circuit, 5 ... Cartesian coordinate position detection circuit, 6 ... Character signal generation circuit, 8 ... Second Modulation circuit, 9 Laser, 10
A, 10B: optical modulator, 11: mirror, 12: objective lens, 13: spindle servo, 14: spindle motor, 15: voltage conversion circuit, 17A: rising edge correction circuit, 17B ... Falling edge correction circuit, 41 optical disk, 42 optical disk player, 43 digital oscilloscope, 44
Computer, 45 ROM writer, 50 correction value table

Claims (14)

[Claims] An optical information recording apparatus for recording second information other than first information to be recorded by irradiating an optical information recording medium with a laser beam condensed by a lens, According to the information, by switching the signal level at a cycle of an integral multiple of a predetermined basic cycle, a first modulation signal producing means for generating a first modulation signal, and the laser beam focused by the lens Position detecting means for detecting relative position information on the optical information recording medium; second information generating means for generating the second information according to the relative position information; and A second modulating means for changing a part thereof; and a light modulating means for modulating the laser light in accordance with an output of the second modulating means. An optical information recording apparatus, wherein the first information and the second information are recorded as the same pit row on the optical information medium by irradiating the optical information medium. 2. The second modulating means superimposes the second information on the modulated signal to generate a superimposed signal, and corrects the timing of the superimposed signal to generate a second modulated signal. 2. The optical information recording apparatus according to claim 1, wherein the optical information recording apparatus comprises timing correction means for performing the operation. 3. The signal superimposing means includes: first pattern detecting means for detecting a pattern of the modulation signal; and a pulse exceeding a predetermined time width according to an output of the pattern detecting means and the second information. 3. The optical information recording apparatus according to claim 2, wherein the optical information recording apparatus is constituted by pulse division means for dividing the pulse into two or more pulses and outputting the divided pulses. 4. The pulse dividing means divides a pulse exceeding a predetermined time width into two pulses and one space, and the width of the two pulses is three times the width of the space.
4. The optical information recording apparatus according to claim 3, wherein the number is twice or more. 5. The timing correction unit includes: a second pattern detection unit that detects a pattern of a signal output by the pulse division unit; and a first modulation signal of the first modulation signal according to an output of the second pattern detection unit. 5. The optical information recording apparatus according to claim 4, further comprising a timing correction unit for correcting a change timing. 6. The timing correction means, when a reproduction signal obtained from the optical information recording medium is binarized at a predetermined slice level to generate a binarized signal, the binary correction signal is generated based on the basic period. 6. The optical information recording apparatus according to claim 5, wherein the timing of the modulation signal is corrected so that the value signal changes. 7. The timing correction unit has a correction data storage unit, and corrects the timing of the modulation signal in accordance with the correction data stored in the correction data storage unit. 7. The optical information recording apparatus according to claim 6, wherein the setting is performed based on a reproduction result of the recording medium. 8. The optical information recording apparatus according to claim 7, wherein the correction data is set based on a reproduction result of the optical information recording medium for evaluation and an interpolation calculation of the reproduction result. 9. An optical information recording method in which pits are formed and recorded by irradiating a laser beam on a laser beam with second information in addition to the first information to be recorded and irradiating the laser beam on the optical information recording medium, Producing a first modulation signal that changes at an integer multiple of a predetermined period from the first information, detecting a relative position of the laser beam on the optical information recording medium, and detecting the second information according to the relative position. In the first modulation signal, a portion where there is no change during a predetermined length is detected, and a second modulation signal obtained by changing a portion where there is no change in the signal of the first modulation signal according to the second information. And recording the first and second information on the optical information recording medium by modulating the laser beam according to the second modulation signal. 10. The method according to claim 9, wherein the change of the portion where there is no signal change is performed so that a recording pulse exceeding a predetermined length is divided into two pulses and one space. Optical information recording method. 11. The apparatus according to claim 10, wherein the timing at which the second modulation signal changes is adjusted in accordance with both the first modulation signal and the second information. Optical information recording method. 12. A method in which first and second information are recorded as a pit row, and the recorded information is read out by irradiating a laser beam focused by a lens onto the pit row. In the optical information recording medium, the first information is mainly recorded by changing a length and a position of the pit, and the second information mainly exceeds a predetermined length of the pit. The optical information recording medium, wherein the pits are recorded so as to be divided into two, and wherein the second information forms a two-dimensional pattern on the optical information recording medium. 13. The second information is mainly recorded in such a manner that pits exceeding a predetermined length among the pits are divided into two, and the pit width is further reduced. The optical information recording medium according to claim 12. 14. The pit length and position are finely adjusted at least by the pit length, a pit pattern recorded before and after the pit, and the pit width. The optical information recording medium according to claim 12.