KR100427102B1 - Optical disc recording apparatus - Google Patents

Abstract

An object of the present invention is to provide an optical disk recording apparatus capable of improving the recording characteristics of overwrite recording and at the same time improving the durability of the optical disk.

When the target modulation degree is higher than the device modulation degree, the recording power increases by a certain ratio than the device recording power or the device recording power, and the recording power below the device recording power measured in the OPC operation is set. When recording and recording power is set, the durability of discs and recording devices can be improved, and when recording power with a certain ratio increased than record recording power is set, recording accuracy can be secured while ensuring durability of discs and recording devices. The recording power can be increased gradually, and when the target modulation degree is less than the recording part modulation degree, the recording recording power is set to a value that decreases the recording recording power. It can be gradually lowered to the recording power which can secure the.

Description

Optical Disc Recording Device {OPTICAL DISC RECORDING APPARATUS}

The present invention relates to an optical disc recording apparatus, and more particularly, to an optical disc recording apparatus for recording on a rewritable optical disc.

There are two types of recordable optical discs, write once and erasable. Among them, a laser beam in which the laser power is changed to two values of the recording power Pw and the erasing power Pe is used for overwriting of the rewritable optical disc. In this case, the recording power of the optical disc changes from the crystalline state to the amorphous state by the recording power Pw, and the pits are formed. Also, the erase power Pe changes from the amorphous state to the crystalline state to erase the existing recording pit. do.

The optimum recording power Pwo and the optimum erasing power Poe of the laser beam during optical disc recording differ depending on the type of optical disc, recording apparatus, and recording speed, respectively. Therefore, in order to set the optimum recording power (Pwo) and the optimum erasing power (Peo) by the combination of the type of optical disc, recording device, and recording speed when recording is actually performed, OPC (Optimum Power Control) prior to recording of information. The power calibration operation is called.

The OPC operation in the conventional rewritable optical disc recording apparatus will be described. On the recording surface of the optical disc, as shown in Fig. 7, a data area for storing various data and a PCA (Power Calibration Area) which is a test recording area for setting the optimum recording power of the laser beam are formed. The PCA is set on the innermost periphery of the disc, and consists of a test area and a count area, and the test area consists of 100 partitions. Each partition consists of 15 frames. In one OPC operation, one of the partitions is used, and the test signal is recorded with 15 laser powers for the 15 frames constituting the partition. This test signal is an EFM modulated signal consisting of a pulse train having a time span three to eleven times the reference time width T (T is approximately 230 nsec at one cycle of frequency 4.32 MHz at standard speed (1x)). Nine feet of length are recorded in the frame.

These frames are irradiated with a laser beam to detect the reflected light from the optical disc to reproduce the test signal and measure the modulation degree m as an index indicating the magnitude of the amplitude of each reproduced HF (high frequency) signal.

m = I11 / Itop... (One)

Here, as shown in Fig. 8, I11 denotes reproduction HF signal amplitude by 11T feet and lands (part between the feet and pit), I3 denotes reproduction HF signal amplitude by 3T feet and lands, and Itop denotes light of the land portion. Reflectance. The modulation degree m changes in accordance with the recording power Pw.

As shown in Fig. 9, when the recording power is low, since the amplitude of the reproduction HF signal is small, the modulation degree m is small, and as the recording power Pw increases, the amplitude of the reproduction HF signal becomes large. (m) becomes large. When the recording power Pw becomes large to some extent, the modulation degree m becomes saturated. Since the jitter or the error is the smallest when the recording power Pw at the point of saturation has started is recorded, the recording power value at this time can be determined as the optimum recording power Pwo.

When determining the optimal recording power Pwo based on the modulation degree m, there is also a method of using the following parameter? Obtained from the characteristics of the modulation degree m.

γ = (dm / dPw) x (Pw / m). (2)

In other words, the parameter γ is a derivative of the characteristic of the modulation degree m. The target value gamma target of the parameter gamma is previously recorded on the optical disc as ATIP (Absolute Time In Pregroove) information. 4, the characteristic of the parameter (gamma) is calculated | required from the characteristic of modulation degree (m) by the said formula, and the recording power value (Ptarget) from which the target value (gamma) target is obtained is calculated | required. Further, since the coefficient? For obtaining the optimum recording power Pwo from Ptarget is recorded in advance on the optical disc, the optimal recording power Pwo can be obtained by the following equation using the coefficient?. .

Pwo = ρ x Ptarget. (3)

And this is set and used as recording power at the time of signal recording. The optimum erase power (Peo) is calculated by using the coefficient (ε) (erase / recording power ratio) and coefficient (κ) (low-speed erasing / recording power ratio compensation coefficient) recorded on the optical disc as ATIP information. Set from the optimum erase power (Pwo).

Peo = ε × Pwo… (4)

Peo = κ × ε × Pwo... (5)

In the case of overwriting recording in the already recorded pit area of the rewritable optical disc, OPC operation is performed in the unrecorded test recording area to use the optimum recording power Pwo and optimum erasing power PoE of the laser beam. have. However, the device recording area in which a signal is recorded with a high recording power cannot be completely erased unless it is erased with a certain high erasing power.

In the past, since the recording characteristics (jitter, block error rate, etc.) at the time of overwriting are not considered at all depending on the recording state of the original pit (depth of recording), that is, greatly influenced by the modulation degree (m), There is a problem that the recording characteristics of the overwrite recording may deteriorate depending on the recording state of the original pit. In addition, if the recording power and the erasing power of the overwrite recording are set high in order to improve the recording characteristics during the overwrite recording, there is a problem that the recording depth of the pit increases and the durability of the optical disc deteriorates.

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and an object of the present invention is to provide an optical disk recording apparatus which can improve the recording characteristics of overwrite recording and at the same time improve the durability of the optical disk.

1 is a block diagram of an embodiment of an optical disc recording apparatus of the present invention.

2, 3A and 3B are flowcharts of the first embodiment of the OPC operation at the time of overwriting.

4 is a diagram showing a relationship between recording power, modulation degree, and gamma in test recording.

5, 6A and 6B are flowcharts of a second embodiment of the OPC operation at the time of overwriting.

7 is a diagram for explaining a test recording area of the optical disc.

8 is a diagram for explaining a modulation degree m.

9 is a diagram for explaining the relationship between recording laser power and modulation degree in OPC.

※ Explanation of code for main part of drawing

20: optical disk 22: axis

24: CPU 26: servo circuit

28: optical pickup 30: regeneration circuit

32: ATIP decoder 34: decoder

38: modulation degree measurement circuit 40: A / D converter

42: D / A converter 44: recording circuit

46: encoder 50: operation mode indicator

The invention as set forth in claim 1 as a means for solving the above-mentioned problems is an optical disc recording apparatus for recording a rewritable optical disc, wherein an overwrite recording of the recording area of the optical disc is performed during overwriting recording. A modulation degree measuring means for measuring the modulation degree of the recording part by reproducing the data, and recording power is varied to record in the test recording area of the rewritable optical disc to obtain the modulation degree of each recording power obtained from the reproduction signal of the predetermined test area. Instrument recording power calculating means for obtaining instrument recording recording power corresponding to the apparatus modulation part based on the relationship between the respective recording powers obtained in the OPC operation and the modulation degree, and the optical disc from the table in which the modulation degree is preset according to the type and recording speed of the optical disc. Take the target modulation degree according to the type and recording speed A target modulation degree acquiring means for obtaining, and a value of the recording power of the recording medium is set to an overwrite recording power when the target modulation degree is equal to or higher than the recording unit modulation degree, and the overwriting recording power when the target modulation degree is less than the recording unit modulation degree. And overwrite recording power setting means for setting a value for which the record recording power is lowered, and overwrite recording of the record region of the optical disc is performed at the overwrite recording power.

In this manner, when the target modulation degree is equal to or greater than the device recording part modulation degree, the overwrite recording power is increased by a certain ratio than the device recording recording power or the device recording recording power, and the recording power below the recording power measured in the OPC operation is set, and the overwriting recording is set. When the recording power is set to power, the durability of discs and recording devices is improved, and when the recording power is increased by a certain ratio than the recording power of recording, it is possible to obtain excellent recording accuracy while ensuring the durability of discs and recording devices. The recording power can be gradually increased.When the target modulation degree is less than the device modulation part, the overwrite recording power is set to a value that reduces the recording power. It can be gradually lowered to the recording power which can secure the.

The invention as set forth in claim 2 is an optical disk recording apparatus for recording a rewritable optical disk, wherein the recording part modulation degree is measured by reproducing a portion in which an overwrite recording of the recording area of the optical disk is performed during overwriting recording. Each recording power and modulation degree obtained in the OPC operation of obtaining a modulation degree of each recording power obtained by reproducing the modulation degree measuring means and recording power in a test recording area of a rewritable optical disc with a variable recording power. Device recording power calculating means for obtaining a device recording recording power corresponding to the device recording unit modulation degree based on the relationship between the two, and a modulation degree based on each recording power and modulation degree based on the relationship between each recording power and modulation degree obtained in the OPC operation. Modulation degree parameter calculating means for obtaining a relationship between parameters, Target modulation degree calculation means for obtaining a target modulation degree corresponding to a target modulation degree parameter read from the optical disc on the basis of the relationship between each recording power and modulation degree and the relationship between the recording power and modulation degree parameter, Overwrite for setting the value of the overwrite recording power to the overwrite recording power when the recording unit modulation degree is higher than, and setting a value for reducing the overwrite recording power to the overwrite recording power when the target modulation degree is below the recording unit modulation degree. A write recording power setting means is provided, and overwrite recording of the device recording area of the optical disc is performed at the overwrite recording power.

As described above, since the target modulation degree corresponding to the target modulation degree parameter read from the optical disc is obtained based on the relationship between the recording power and the modulation degree and the relationship between the recording power and the modulation degree parameter obtained in the OPC operation, the type and recording of the optical disc are obtained. It can be applied even when the modulation rate according to the speed is not set in the table.If the target modulation degree is higher than the device modulation degree, the overwrite recording power is increased by a certain ratio than the device recording power or the device recording power. The recording power below the measured recording power is set.If the recording power is set to the overwrite recording power, the durability of discs and recording devices is improved, and if the recording power is increased by a certain ratio than the recording power of the disc, Excellent recording accuracy can be obtained while ensuring the durability of the recording device. It is possible to gradually increase the recording power, and when the target modulation degree is less than the recording part modulation degree, the value of the recording recording power is set to the overwrite recording power, so that the recording characteristics are maintained while maintaining the recording characteristics in good condition. It can be gradually lowered by the recording power which can ensure durability.

Further, in the invention as set forth in claim 3, in the optical disc recording apparatus as set forth in claim 1 or 2, the overwrite recording power setting means performs the OPC operation on the overwrite recording power when the target modulation degree is equal to or higher than the recording medium modulation degree. The optimum recording power obtained is set based on the relationship between the obtained recording power and modulation degree. In this way, high recording accuracy can be ensured to set the optimal recording power for the overwrite recording power when the target modulation degree is higher than the device log modulation degree, and the optimum recording power Pwo measured in the OPC operation is determined by the optical disc and the device to be recorded. Since it is the recording power judged to be optimal by the combination of those viewpoints, durability can also be fully ensured.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 shows a block diagram of an embodiment of an optical disc recording apparatus of the present invention. In FIG. 1, the optical disc 20 is driven by a spindle motor and rotates about an axis 22. The CPU 24 supplies a command to the servo circuit 26 based on the write / read command supplied from the host device. The servo circuit 26 performs the CLV (linear speed constant) servo of the spindle motor and performs rotation control of the sled motor of the optical pickup 28 to move to the desired block of the optical disc 20, The focus servo and tracking servo of the pickup 28 are performed.

The laser beam irradiated from the optical pickup 28 is reflected on the recording surface of the optical disc 20 so that the reflected beam is detected by the optical pickup 28. The reproduction HF signal obtained by the optical pickup 28 is supplied to the reproduction circuit 30, and the amplified reproduction HF signal is supplied to the servo circuit 26 and subjected to EFM demodulation in the reproduction circuit 30 at the same time. The ATIP signal is separated and supplied to the ATIP decoder 32. The demodulated signal, which has been synchronized, is supplied to the decoder 34 and output as reproduction data after the CIRC (Cross Interleaved Read Solomon Code) decoder and error correction. The ATIP decoder 32 decodes ATIP information such as an ID number and various parameters and supplies them to the CPU 24 and the servo circuit 26.

In addition, the reproduction signal output from the reproduction circuit 30 is supplied to the modulation degree measurement circuit 38. The modulation degree measurement circuit 38 measures the modulation degree m of the reproduction HF signal. This modulation degree m is digitized by the A / D converter 40 and supplied to the CPU 24.

The CPU 24 generates a write power control signal based on the modulation degree m, which is analogized to the D / A converter 42 and supplied to the write circuit 44 as a write power control voltage. do. The encoder 46 implements a CIRC (Cross Interleaved Reed Solomon Code) encoder based on the control of the CPU 24 and supplies it to the recording circuit 44.

The recording circuit 44 performs EFM modulation on the signal supplied from the encoder 46 at the time of recording and controls the modulation signal with the recording power according to the recording power control voltage to supply to the laser diode LD in the optical pickup 28. Drive. In this way, the laser beam is irradiated onto the optical disc 20 to perform signal recording.

In addition, in the internal memory (RAM) of the CPU 24, the history of past OPC (write power calibration), that is, the optimum recording power measured in the past is stored. This OPC history is maintained for some time.

In the internal memory (ROM) of the CPU 24, a table of the values (ID numbers) of the optical discs and the m values (target modulation degrees (mwo)) according to the recording speeds (1, 2, 4, 10 times speed) are set. At the same time, a table in which the start power and the step power of the OPC are set according to the type of the optical disc, and the parameter γ are set according to the type of the optical disc. In addition, the instruction input from the operation mode instruction unit 50 is supplied to the CPU 24.

2, 3A and 3B show a flowchart of the first embodiment of the OPC operation at the time of overwriting executed by the CPU 24. This embodiment is an OPC operation when the target modulation degree mwo corresponding to the ID number of the optical disc mounted in the internal memory (ROM) of the CPU 24 is stored.

In Fig. 2, when overwrite recording is instructed from the operation mode indicating section 50 in step S10, the CPU 24 starts from the position at which the overwrite recording of the already recorded pit area has been recorded in step S12. Play a block of a certain length. Next, in step S14, the modulation degree mini of the reproduction portion is measured.

Next, in step S16, the recording speed is set to a value designated by the recording command, and in step S18, the ID number recorded as the ATIP information is obtained from the optical disc 20, and the type (type of media) of the optical disc is obtained. Determine. Next, in step S20, the target modulation degree is referred to by referring to the table of the internal memory of the CPU 24, in which the m value (target modulation degree mwo) is set in accordance with the type and recording speed of the medium, as the type and recording speed of the media. Read (mwo). Then, in step S22, the table of the internal memory of the CPU 24 is selected in accordance with the recording speed, and in step S24, the recording power Pw is set in units of step power from the start power set in the selected table. The test signal is recorded in the test recording area of the optical disc 20 by changing the steps.

Next, the test recording portion is reproduced in step S26, and the modulation degree m is measured for each of the 15 recording powers Pw in step 28 to obtain the characteristics shown in solid lines in FIG. Then, in step S30, the degree of modulation (m) for each of the 15 recording powers Pw (corresponding to the solidity in Fig. 4) corresponds to the modulation degree mini (value obtained in step S14). Find the recording power Pini. Next, in step 32, the optimum recording power Pwo corresponding to the target modulation degree mwo is obtained from the characteristic indicated by the solid line.

Subsequently, the process proceeds to step S34 of FIG. 3A, and the magnitude and magnitude relationship of both are determined in step S36 by comparing the modulation degree mini and the target modulation degree mwo. Here, in the case of mwo? Mini, the recording power is set to Pini x Y in step S38. Y is one or more values (for example, 1.05, including the case of 1) preset in CPU24. Thereafter, the flow advances to step S42. On the other hand, in the case of mwo <mini, the recording power P is set to Pini x X in step S40, and the flow proceeds to step S42. In addition, X is a value less than 1 (for example, 0.95) preset in CPU24.

That is, in step S40, the modulation degree mini (may be recorded in a recording apparatus other than the apparatus shown in FIG. 1) at the time of last recording is smaller than the target modulation degree mwo of the apparatus shown in FIG. In this case, the current recording power (P) is increased by a certain ratio than the previous recording power or the previous recording power, and in the case where the modulation degree (mini) of the previous proxy is larger than the target modulation degree, the current recording power (P) is increased. It is lowered by a certain ratio than the recording power (Pini) at the time of the last recording.

In the next step S42, the OPC operation is terminated. In this step, the optimum erase power Peo is set from the equations (4) and (5) using the coefficients epsilon and coefficients recorded on the optical disc 20 as ATIP information. Thereafter, overwriting recording is started in step S44.

By setting the recording power at the time of overwriting recording as described above, in the state of mwo ≥ mini, the recording power always increases by a certain ratio over the recording power (Pini) or the recording power (Pini) which becomes the modulation degree (mini). Therefore, the recording power below the optimal recording power (Pwo) measured in the OPC operation is set, and if the recording power (Pini) is set in the overwrite recording power, the durability of disks and recording devices is improved, and the ratio is fixed compared to the recording power (Pini). When the increased recording power is set, the recording accuracy can be improved while ensuring the durability of the disc and the recording apparatus. In addition, by repeating the state in which the recording power is increased by a certain ratio than the recording power (Pini), the recording power is closer to the optimum recording power (Pwo) measured in the OPC operation, thereby ensuring recording accuracy while ensuring durability of disks and recording devices. Can be improved. In the state of mwo <mini, since the state is lowered by a certain ratio than the recording power Pini at the time of the previous recording, this state is repeated so that the recording power is close to the optimum recording power Pwo measured in the OPC operation. It can be gradually lowered to the recording power which can ensure durability of a disc, a recording apparatus, etc., maintaining a good state.

In addition, as shown in Fig. 3B, when focusing on securing the recording accuracy, the recording power may be set to the optimum recording power Pwo when mwo? Mini (S38). Since the optimum recording power Pwo measured in the OPC operation is the power determined to be optimal by the combination of the optical disc to be recorded and the recording apparatus at that time, durability can also be sufficiently secured.

The contents of the series of OPC operations (characteristics shown in Fig. 4) are held in the memory (RAM) in the CPU 24 for a certain time as a history. For this reason, when overwriting another area continuously, the value of the immediately preceding OPC (characteristic shown in FIG. 4) can be used, and after measuring the modulation degree mini of the area to overwrite recording, step S16 S32) may be jumped and compared with the OPC value (characteristics shown in FIG. 4) of the history.

5, 6A and 6B show a flowchart of the second embodiment of the OPC operation at the time of overwriting executed by the CPU 24. As shown in FIG. This embodiment is an OPC operation when the target modulation degree mwo corresponding to the ID number of the optical disc mounted in the internal memory (ROM) of the CPU 24 is not recorded.

In FIG. 5, when the overwrite recording is instructed from the operation mode indicating unit 50 in step S110, the CPU 24 starts a predetermined length at the position where the overwrite recording of the already recorded device recording area is recorded in step S112. Play the block. Next, in step S114, the modulation degree mini of the reproduction portion is measured.

Next, in step S116, the recording speed is set to a value designated by the recording command, and in step S118, an ID number recorded as ATIP information is obtained from the optical disc 20, and the type of the media (optical disc) is determined. do. Subsequently, in step S122, the table of the internal memory of the CPU 24 is selected in accordance with the recording speed, and in step S124, the recording power Pw is 15 steps in units of step power from the start power set in the selected table. The test signal is recorded in the test recording area of the optical disc 20.

Subsequently, the test recording portion is reproduced in step S126, the modulation degree m is measured for each of the 15 recording powers Pw in step S128, and the characteristic shown by the solid line in FIG. 4 is obtained. Then, in step S130, from the relationship of the modulation degree m for each of the 15 recording powers Pw (the characteristic shown by the solid line in FIG. 4), the recording power Pw of the 15th stage is expressed using the equation (2). Each parameter (γ) is obtained. The parameter (gamma) with respect to the modulation degree m is shown by the dashed-dotted line in FIG.

Further, in step S131, the recording power Ptarget corresponding to the target value [gamma] target in the ATIP information of the optical disc is obtained from the characteristic of the parameter [gamma] shown by dashed-dotted lines in FIG. Next, in step S132, the Ptarget is multiplied by the coefficient p in the ATIP information to obtain the optimum recording power Pwo, and in step S134, the modulation degree mwo corresponding to the optimum recording power Pwo is obtained. It obtains from the characteristic of the modulation degree m shown by a solid line in FIG. In step S136, the modulation degree mwo is referred to as a target modulation degree.

Subsequently, the process proceeds to step S138 of FIG. 6A and the recording power Pini corresponding to the modulation degree mini is obtained from the characteristic of the modulation degree m shown by the solid line in FIG. The flow advances to step S140 to compare the modulation degree mini and the target modulation degree mwo to determine the magnitude relationship between the two in step S142. In this case, in the case of mwo? Mini, the recording power P is set to Pini x Y in step S144. Y is one or more values (for example, 1.05, including the case of 1) preset in CPU24. Thereafter, the flow advances to step S148. On the other hand, in the case of mwo <mini, the recording power P is set to Pini x X in step S146, and the flow proceeds to step S148. In addition, X is a value less than 1 (for example, 0.95) preset in CPU24.

That is, in step S146, the modulation degree mini (may be recorded in a recording device other than the device shown in FIG. 1) at the time of the last recording is the target modulation degree (mwo) of the device shown in FIG. Is smaller than the previous recording power (Pini) or the previous recording power, and the modulation degree (mini) of the previous recording proxy is greater than the target modulation degree (mwo). At this time, the recording power P is lowered by a certain ratio than the recording power Pini at the time of the previous recording.

In the next step S148, the OPC operation is terminated. In this step, the optimum erase power Peo is set from the equations (4) and (5) using the coefficients epsilon and coefficients recorded on the optical disc 20 as ATIP information. After that, overwriting recording is started in step S150.

Also in this embodiment, by setting the recording power at the time of overwriting recording, in the state of mwo ≥ mini, the recording power is always increased by a certain ratio higher than the recording power (Pini) or the recording power (Pini) which becomes the modulation degree (mini). Since the overwrite is recorded, the recording power below the optimum recording power (Pwo) measured in the OPC operation is set.If the recording power (Pini) is set in the overwriting recording power, the durability of the disc and the recording device is improved, and the recording power (Pini) is set. When the recording power with a certain ratio increase is set, the recording accuracy can be improved while ensuring the durability of the disc and the recording device. In addition, by repeating the state in which the recording power is increased by a certain ratio than the recording power (Pini), the recording power is closer to the optimal recording power (Pwo) measured in the OPC operation, thereby ensuring the recording accuracy while ensuring durability of disks and recording devices. Can be improved. In the state of mwo <mini, since the state is lowered by a certain ratio than the recording power Pini at the time of the previous recording, this state is repeated, so that the recording power is close to the optimum recording power Pwo measured in the OPC operation. It can be gradually lowered to the recording power which can ensure durability of a disc, a recording apparatus, etc., maintaining a good state.

In addition, as shown in Fig. 6B, when focusing on securing the recording accuracy, the recording power may be set to the optimum recording power Pwo when mwo? Mini (S144). Since the optimum recording power Pwo measured in the OPC operation is the power determined to be optimal by the combination of the optical disc and the recording apparatus to be recorded, durability can be sufficiently secured.

In addition, the contents of the series of OPC operations (characteristics shown in FIG. 4) are held in the memory (RAM) in the CPU 24 for a certain time as a history. For this reason, when overwriting another area continuously, the value of the immediately preceding OPC (characteristic shown in FIG. 4) can be used, and after the measurement of the modulation degree mini of the area for overwriting recording, step S116. S138) may be jumped and compared with the OPC value (characteristics shown in FIG. 4) of the history.

In addition, steps S12, S14, S112, and S114 correspond to the modulation degree measuring means described in the claims, and steps S24 to S30, S124 to S128, and S138 correspond to the apparatus recording power calculating means, and step S18. S20 corresponds to the target modulation degree obtaining means, steps S34 to S40 and S140 to S146 correspond to the overwrite recording power setting means, and step S130 corresponds to the modulation degree parameter calculating means, and step ( S131 to S136 correspond to the target modulation degree calculation means.

As described above, the invention described in Claim 1 increases the overwrite recording power to the overwrite recording power when the target modulation degree is equal to or higher than the recording part modulation degree, and the recording power below the recording power measured in the OPC operation. When the recording power is set to overwrite recording power, the durability of discs and recording devices is improved, and when the recording power is increased by a certain ratio than the recording power of recording, the durability of discs and recording devices is secured. The recording power can be gradually increased to increase the recording accuracy. When the target modulation degree is less than the recording part modulation degree, the recording recording power is kept in a good state because the recording recording power is set to the overwrite recording power. Recording power while ensuring durability of discs and recording devices Gradually you can go to deteriorate.

The invention described in claim 2 obtains the target modulation degree corresponding to the target modulation degree parameter read from the optical disc on the basis of the relationship between each recording power and modulation degree and the relationship between each recording power and modulation degree parameter obtained in the OPC operation. Can be applied even when the modulation rate corresponding to the recording speed is not set in the table. If the target modulation degree is higher than the device modulation degree, the overwrite recording power is increased by a certain ratio from the device recording power or the device recording power. The recording power below the recording power measured in the OPC operation is set.If the recording power is set to the overwrite recording power, the durability of disks and recording devices is improved, and the recording increases by a certain ratio than the recording power of the recording. When the power is set, the disc and recording device The recording power can be gradually increased to a recording power capable of increasing the lock accuracy, and when the target modulation degree is less than the recording part modulation degree, the value of the recording recording power is set to the overwrite recording power so that the recording characteristics are in good condition. It can be gradually lowered to the recording power which can ensure the durability of a disc, a recording apparatus, etc., maintaining it.

The invention as set forth in claim 3 focuses on securing the recording accuracy, and since the optimum recording power Pwo measured in the OPC operation is the power judged to be optimal by the combination of the optical disc to be recorded and the recording apparatus at that time, Durability can also be secured.

Claims (5)

An optical disc recording apparatus for recording a rewritable optical disc, Modulation degree measuring means for reproducing a portion which performs overwriting recording of the device recording area of the optical disc at the time of overwriting recording and measuring the device recording part modulation degree; On the basis of the relationship between the recording power and the modulation degree obtained in the OPC operation of varying the recording power and recording in the test recording area of the rewritable optical disc to obtain the modulation degree of each recording power obtained from the reproduction signal of the predetermined test area. Record recording power calculating means for obtaining a record recording power corresponding to the record level modulation degree; Target modulation degree acquisition means for obtaining a target modulation degree; And When the target modulation degree is greater than or equal to the recording unit modulation degree, a value greater than or equal to the recording recording power is set to the overwrite recording power, and when the target modulation degree is less than the recording unit modulation degree, the record recording power is lowered to the overwrite recording power. An overwrite recording power setting means for setting a value; And an overwrite recording of the device recording area of the optical disc with the overwrite recording power. An optical disc recording apparatus for recording a rewritable optical disc, Modulation degree measuring means for reproducing a portion which performs overwriting recording of the device recording area of the optical disc at the time of overwriting recording and measuring the device recording part modulation degree; On the basis of the relationship between the recording power and the modulation degree obtained in the OPC operation of varying the recording power and recording in the test recording area of the rewritable optical disc to obtain the modulation degree of each recording power obtained from the reproduction signal of the predetermined test area. Record recording power calculating means for obtaining a record recording power corresponding to the record level modulation degree; Modulation degree parameter calculation means for obtaining a relationship between modulation degree parameters based on each recording power and modulation degree based on the relationship between each recording power and modulation degree obtained in the OPC operation; Target modulation degree calculation means for obtaining a target modulation degree corresponding to a target modulation degree parameter read from the optical disc on the basis of the relationship between each recording power and modulation degree obtained in the OPC operation and the relationship between each recording power and modulation degree parameter; And When the target modulation degree is greater than or equal to the recording unit modulation degree, a value greater than or equal to the recording recording power is set to the overwrite recording power, and when the target modulation degree is less than the recording unit modulation degree, the record recording power is lowered to the overwrite recording power. An overwrite recording power setting means for setting a value; And an overwrite recording of the device recording area of the optical disc with the overwrite recording power. delete An optical disc recording apparatus for recording a rewritable optical disc, Modulation degree measuring means for reproducing a portion which performs overwriting recording of the device recording area of the optical disc at the time of overwriting recording and measuring the device recording part modulation degree; On the basis of the relationship between the recording power and the modulation degree obtained in the OPC operation of varying the recording power and recording in the test recording area of the rewritable optical disc to obtain the modulation degree of each recording power obtained from the reproduction signal of the predetermined test area. Record recording power calculating means for obtaining a record recording power corresponding to the record level modulation degree; Target modulation degree acquisition means for acquiring a target modulation degree in accordance with the type and recording speed of the optical disc from a table in which modulation degrees are preset according to the type and recording speed of the optical disc; And When the target modulation degree is greater than or equal to the recording unit modulation degree, a value greater than or equal to the recording recording power is set to the overwrite recording power, and when the target modulation degree is less than the recording unit modulation degree, the record recording power is lowered to the overwrite recording power. An overwrite recording power setting means for setting a value; And an overwrite recording of the device recording area of the optical disc with the overwrite recording power. 5. The method according to claim 1, 2, or 4, wherein the overwrite recording power setting means sets each record power and modulation degree obtained in the overwrite recording power in the OPC operation when the target modulation degree is equal to or higher than the device lock modulation degree. And an optimum recording power obtained on the basis of the relation of.