JP2003196832A - Device and method for information recording - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method for information recording, which can properly record information data in a plurality of recording areas by a recording means under mutually different recording conditions. <P>SOLUTION: The information recording device which records the information data in the plurality of recording areas of a writable disk by the recording means under the different recording conditions is equipped with a storage means which stores the information data to be recorded on the disk; and the information data stored in the storage means are transferred to a buffer memory, read out of the buffer memory in order, and recorded to the disk by the recording means and after a buffer underrun occurs to the buffer memory, recording conditions of the recording means are changed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording apparatus and method for recording information data in a plurality of recording areas of a writable disc by recording means under different recording conditions.

[0002]

2. Description of the Related Art At present, CD-Rs, CD-RWs, DVD-Rs, and DVs are used as optical disks capable of writing information data.
D-RW, DVD-RAM, etc. are known. Furthermore, an information recording device such as an optical disc recorder that allows a general user to record arbitrary information data on such an optical disc has already been commercialized.

[0003]

When data is recorded on an optical disc which can be recorded by such an information recording device, a recorded optical disc having various recording characteristics is created. This is because there is a difference in recording performance of the information recording device and a characteristic error of the optical disc itself. On the other hand, in a disc player such as a DVD player that reproduces an optical disc, it is necessary to be able to reproduce a recorded optical disc having various recording characteristics. Therefore, manufacturers of disc players are demanding a standard test disc for evaluating the reproduction performance of the disc player.

When creating a test disc, it is necessary to record information data in a plurality of recording areas under different recording conditions by recording means such as a DVD writer.
There is a problem that the recording control of the recording means is difficult.
Therefore, an object of the present invention is to provide an information recording apparatus and method capable of appropriately recording information data in a plurality of recording areas by recording means under mutually different recording conditions.

[0005]

An information recording apparatus of the present invention is an information recording apparatus for recording information data in a plurality of recording areas of a writable disc under different recording conditions by the recording means. Storage means for storing the information data to be recorded, and the information data stored in the storage means is transferred to a buffer memory for storage, the information data stored in the buffer memory is sequentially read, and the recording means stores the data on the disc. An information recording control means for recording the read information data, and a recording condition switching means for switching the recording condition of the recording means after a buffer underrun occurs in the buffer memory are featured.

The information recording method of the present invention is an information recording method for recording information data in a plurality of recording areas of a writable disc under different recording conditions by the recording means, and is stored in advance in the storage means. After the information data is transferred to the buffer memory for storage, the information data stored in the buffer memory is sequentially read, the read information data is recorded on the disc by the recording means, and after the buffer underrun occurs in the buffer memory It is characterized in that the recording conditions of the recording means are switched.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings. Figure 1 shows DVD-R and DVD-
1 shows a recording device capable of recording information data on an optical disc such as an RW. This recording device has not only a recording function but also a reproducing function, and as shown in FIG. 1, a pickup 1, an analog processing circuit 2, a DVD decoder 3, and an LP.
P decoder 4, LD driver 5, strategy generation circuit 6, DVD encoder 7, buffer memory 8, CPU
9, a SCSI-IF circuit 10 and a system controller 11. The parts other than the system controller 11 are configured as a DVD writer.

As shown in FIG. 2, the pickup 1 has a semiconductor laser element 21 for emitting a laser beam and a four-division photodetector (reference numeral 22 in FIG. 3), and a semiconductor laser is mounted on an optical disk 13 which is rotationally driven by a spindle motor 12. The laser beam emitted from the element 21 is emitted, and the reflected beam of the emitted laser beam is guided to the four-division photodetector 22. A part of the laser beam emitted from the semiconductor laser element 21 is supplied to the front monitor 23 on the way to the optical disc 13.

As shown in FIG. 3, the four-division photodetector 22 is divided into four light receiving surfaces 22a to 22a which are divided into a direction along the tangent line of the information recording track of the optical disk 13 and a direction orthogonal to the tangent line of the recording track. It is composed of a photoelectric conversion element having 22d. The photoelectric conversion element receives the reflected light from the optical disc 13 due to the information reading spots on the four light receiving surfaces 22a.
22d to receive light and individually convert the received light into electrical signals, and output the received light signals Ra to Rd to the analog processing circuit 2.

The analog processing circuit 2 includes adders 31 to 33.
And a pre-pit detection circuit 34. Adder 31
Adds the received light signals Ra and Rd, and the adder 32 adds the received light signals Rb and Rc. That is, the adder 31 adds the received light signals Ra and Rd received by the light receiving surfaces 22a and 22d of the four-division photodetector 22, respectively, and outputs the added received light signal Ra _{+ d} . Also, the adder 32 is 4
The light receiving signals Rb and Rc obtained by receiving the light by the light receiving surfaces 22b and 22c of the split photodetector 22 are added together to output the added light receiving signal Rb + c.

The adder 33 adds the output signals R _{a + d} and R _{b + c} of the adders 31 and 32. The output signal of the adder 33 is a read signal, that is, an RF signal, and is supplied to the DVD decoder 3. The DVD decoder 3 digitizes the RF signal and then subjects the RF signal to expansion processing to demodulate and output a reproduction signal. The pre-pit detection circuit 34 is
The difference between the output signals Ra + d and Rb + c of the adders 31 and 32 is calculated to generate the radial push-pull signal PP as shown in FIG. 4, and the radial push-pull signal PP is binarized by the threshold value TH. As a result, the land prepit (LPP) formed on the land track of the optical disc 13 is detected as the prepit detection signal PP _D, and the prepit detection signal PP _D is detected.
It is supplied to the decoder 4. The LPP decoder 4 outputs the address of the laser beam irradiation position on the optical disk 13 by the pickup 1 as data to the common bus 14 according to the pre-pit detection signal PP _D.

The bus 14 has a DVD decoder 3 and an LPP.
Decoder 4, DVD encoder 7, CPU 9 and SCS
The I-IF circuit 10 is connected. The SCSI-IF circuit 10 is a SCSI interface for connecting the system controller 11 and the bus 14. The system controller 11 is composed of, for example, a personal computer, and stores image data, which is information data to be recorded as test data on the optical disc 13, in a file format in an internal hard disk (not shown) in a readable manner. The system controller 11 sends a recording start command to the SC when recording data on the optical disc 13.
The image data is supplied from the hard disk to the CPU 9 via the SI-IF circuit 10 and the bus 14 and is transferred to the buffer memory 8 via the SCSI-IF circuit 10, the bus 14 and the DVD encoder 7 to be stored therein.

At the time of data recording, the DVD encoder 7 sequentially reads out the stored data from the buffer memory 8 and encodes it to create recording data and supplies it to the strategy generation circuit 6. The strategy generation circuit 6 performs a code conversion of the recording data to form a mark according to each bit of the recording data on the optical disc 13, and generates a write pulse and an erase pulse. The code conversion, which will be described later, is a conversion corresponding to a bit run of "1" or "0" of recording data. When the optical disk 13 is a DVD-RW, a write pulse and an erase pulse are generated, but when the optical disk 13 is a DVD-R, only a write pulse is generated. The pulse generated by the strategy generation circuit 6 is supplied to the LD driver 5.

The LD driver 5 is a semiconductor laser device 21.
It is a circuit for selectively supplying a recording current, a bias current, an erasing current and a reproducing current. As shown in FIG. 2, the LD driver 5 includes an interface 41 and a D / A converter 42.
-44, current sources 45-47, switches 48-50, buffer amplifier 51, sample hold circuit 52, APC
(Auto power controller) 53 and V / I converter 5
It is equipped with 4.

The interface circuit 41 selectively supplies power level information, which is digital data output from the CPU 9, to the D / A converters 42 to 44. Each of the D / A converters 42 to 44 converts the supplied digital data into an analog value and supplies it to the corresponding current source 45 to 47. The current sources 45 to 47 are capable of outputting a current of a level designated by an analog value. The current source 45 is for bias current output, and the output of the current source 45 is a switch 48.
Are connected. The switch 48 is a changeover switch, and selectively connects either the output of the current source 45 or the output of the V / I converter 54 to the anode of the semiconductor laser device 21. When the output of the current source 45 is selected by the switch 48, the bias current which is the output current of the current source 45 is supplied to the semiconductor laser device 21, and when the output of the V / I converter 54 is selected, the V / I converter is selected. A reproduction current, which is an output current of 54, is supplied to the semiconductor laser device 21. The current source 46 is for outputting an erase current, and the current source 46
A switch 49 is connected to the output of the. Switch 4
Reference numeral 9 denotes an on / off switch which, when turned on, connects the output of the current source 46 to the anode of the semiconductor laser element 21 and relays the erase current to the semiconductor laser element 21. Current source 4
Reference numeral 7 is for recording current output, and a switch 50 is connected to the output of the current source 47. The switch 50 is an on / off switch, and when it is turned on, the output of the current source 47 is connected to the anode of the semiconductor laser element 21 to relay the recording current to the semiconductor laser element 21. The cathode of the semiconductor laser device 21 is grounded.

The front monitor 23 receives a part of the laser beam emitted from the semiconductor laser element 21 as described above, and generates a front monitor signal which is an electric signal having a level corresponding to the intensity of the received light. A sample hold circuit 52 is connected to the output of the front monitor 23 via a buffer amplifier 51. Sample hold circuit 52
Holds and samples the front monitor signal amplified by the buffer amplifier 51 at a predetermined timing. The hold signal of the sample hold circuit 52 is supplied to the APC 53. The APC 53 generates a voltage signal for the V / I converter 54 so that the level of the front monitor signal held by the sample hold circuit 52 becomes the reference level. The V / I converter 54 outputs a reproduction current corresponding to the voltage signal supplied from the APC 53.

The information recording device is provided with a servo circuit 15 such as a tracking servo, a focus servo, a carriage servo, and a tilt servo for writing or reading data on or from the optical disc 13. The writing position on the disk 13 by the pickup 1 is adjusted by the servo circuit 15 in response to a command from the CPU 9. As shown in FIG. 5, the optical disc 13 has a PCA (Power Calibration Area) and an RMA (Recor) from the inner circumference to the outer circumference.
data management area), a lead-in area, a data area, and a lead-out area. PCA and RMA are called R information area, and PC
A is an area for performing trial writing when determining the recording power of the laser beam, and RMA is an area for writing management information RMD regarding recording.

Next, the operation of recording the test data on the optical disc 13 in the information recording apparatus having such a configuration will be described. First, as shown in FIG. 6, the system controller 11 sets recording conditions (step S).
1). The recording condition is assigned to each of the plurality of recording areas by dividing the data area of the optical disc 13 into a plurality of recording areas (recording area 1, recording area 2, ..., Recording area MAe). When the optical disc 13 is a DVD-R, the disc shown in FIG.
As shown in FIG. 5, an address defining a plurality of recording areas, an elapsed time corresponding to the address, a recording power and a bias power are set as recording conditions. The recording power and the bias power of each of the plurality of recording areas have the same ratio. When the optical disc 13 is a DVD-RW, as shown in FIG. 8, an address defining a plurality of recording areas, an elapsed time corresponding to the address, a recording power, an erasing power, and a bias power are set as recording conditions. The recording power and the erasing power of each of the plurality of recording areas have the same ratio. When the optical disk 13 is a DVD-RW, the bias power is the same in all the recording areas in the case of FIG. 8, but as shown in FIG. 9, different bias powers are set in each of the plurality of recording areas. Is also good. In the case of FIG. 9, the recording power, the erasing power, and the bias power of each of the plurality of recording areas are the same. The jitter and PI error are values that change according to the recording power, the bias power, and the erasing power in the case of DVD-RW.

The recording condition is set according to the user's operation input from the keyboard, or the data on the predetermined recording condition is set by the user's operation input. The recording conditions are different for each of the plurality of recording areas. After the recording condition is set, when the recording start operation is performed by the keyboard or the mouse (step S2), the system controller 11 starts the recording operation (step S3).

In the recording operation, as shown in FIG. 10, the recording area MA is set to 1 (step S21), and the recording condition of the recording area MA is instructed to the CPU 9 via the SCSI-IF circuit 10 and the bus 14 (step S22). ). Recording area M
A is 1 in the address setting order of the above plurality of storage areas
There are two areas. The system controller 11 reads out image data as information data to be recorded from the hard disk and transfers it to the buffer memory 8 via the SCSI-IF circuit 10, the bus 14 and the DVD encoder 7 (step S23). The image data is transferred to the buffer memory 8 in block units, and the buffer memory 8 holds the transferred image data.
The data holding amount of the buffer memory 8 is the DVD encoder
Although the image data is reduced by reading the image data from the buffer memory 8 by the step S23, the image data from the system controller 11 is appropriately transferred by the execution of step S23, and this is continued until the data writing to one recording area is completed.

The system controller 11 executes step S2.
3 is executed, the write command is supplied to the CPU 9 via the SCSI-IF circuit 10 and the bus 14 (step S2).
4). The CPU 9 starts the operation of the DVD writer according to the write command. That is, from the LPP decoder 4 to the bus 1
Pickup 1 on optical disc 13 obtained via
The writing position of the pickup 1 is moved to the recording area MA of the data area in accordance with the address information of the writing position. Then, the power level information of each of the recording power, the erasing power, and the bias power corresponding to the recording area MA is LDed.
Output to the driver 5. This shows the case where the optical disk 13 is a rewritable type optical disk, but when the optical disk 13 is a write-once type optical disk, the power level information of each recording power and bias power corresponding to the recording area MA is LD. It is output to the driver 5, and the erasing power shows 0 mW. In the LD driver 5, the output bias current value of the current source 45, the output erasing current value of the current source 46, and the output recording current value of the current source 47 are determined according to the power level information. The changeover switch 48 is switched to the current source 45 side, and a bias current flows from the current source 45 to the semiconductor laser element 21.

The CPU 9 also instructs the DVD encoder 7 to read image data. The image data held in the buffer memory 8 is sequentially read by the DVD encoder 7, further encoded, and supplied to the strategy generation circuit 6 as recording data. The strategy generation circuit 6 code-converts the recording data to generate an erase pulse and a write pulse. The switch 49 is turned on in response to the erase pulse, and the current source 46
The erase current is added to the bias current and flows to the semiconductor laser device 21. Switch 50 according to the light pulse
Is turned on, and the recording current from the current source 47 is added to the bias current and flows into the semiconductor laser element 21. As a result, a laser beam for recording is emitted from the semiconductor laser element 21, and data writing on the optical disc 13 is performed.

The system controller 11 reads the address information of the writing position of the pickup 1 on the optical disk 13 obtained from the LPP decoder 4 via the bus 14 and the SCSI-IF circuit 10 (step S25), and the address information is recorded in the recording area. It is determined whether or not it indicates the final address of MA (step S26). If the read address information does not indicate the final address of the recording area MA, the process returns to step S23 and the subsequent operations are repeated. If the read address information indicates the final address of the recording area MA, wait for a time sufficient to cause a buffer underrun (step S2).
7). The buffer underrun is a state in which all the image data held in the buffer memory 8 is read by the DVD encoder 7 and data writing is performed, and the buffer memory 8 has no held data. Since it is determined that the address information read in step S26 indicates the final address of the recording area MA, the waiting time for causing the buffer underrun is, for example, a time corresponding to the data writing for the final address. Is. Since the execution of the next step S28 is delayed by this time, the image data can be surely written up to the final address of the current recording area MA under the recording conditions corresponding thereto. That is, it is possible to prevent the recording condition from being switched within the final address of the current recording area MA.

After executing step S27, the system controller 11 determines whether the recording area MA is the final recording area MAe (step S28). MA ≠ MAe
If so, 1 is added to MA to obtain the next recording area MA (step S29), the process proceeds to step S22, and the operations after step S22 are repeated. If MA = MAe, it means that the writing of the image data to the plurality of recording areas is completed.

The optical disc 13 is a write-once disc DVD.
In the case of −R, the recorded data is, for example, as shown in FIG.
When 8T (T is a unit bit length) is included as shown in FIG. 11, the recording data is converted into the write pulse train by the strategy generation circuit 6 as shown in FIG. When the write pulse is not generated, the bias current flows from the current source 45 to the semiconductor laser device 21. The power of the laser beam emitted from the semiconductor laser device 21 by the bias current, that is, the bias power is P from the zero level as shown in FIG.
The power level is higher by b. When the write pulse is generated, the recording current from the current source 47 is added to the bias current and flows into the semiconductor laser element 21. The power of the laser beam emitted from the semiconductor laser element 21 by the total current of the recording current and the bias current, that is, the recording power is Po from zero level as shown in FIG. 11C.
The power level is higher by (Po> Pb).

When the optical disk 13 is a rewritable type DVD-RW, the recorded data is, for example, 8T (T is a unit bit length) as shown in FIG. 12A.
In the case of including an erase pulse as shown in FIG. 12 (b), the recording data is recorded by the strategy generation circuit 6 as shown in FIG. 12 (c).
And a write pulse train as shown in FIG. The erase pulse is generated immediately before the write pulse train is generated.
When neither the erase pulse nor the write pulse is generated, a bias current flows from the current source 45 to the semiconductor laser device 21. The power of the laser beam emitted from the semiconductor laser device 21 by the bias current, that is, the bias power is a power level higher by Pb than the zero level as shown in FIG. When only the erase pulse is generated, the erase current is added to the bias current from the current source 46 and flows into the semiconductor laser element 21. The power of the laser beam emitted by the semiconductor laser device 21 by the total current of the erasing current and the bias current, that is, the erasing power is a power level higher than the zero level by Pe (Pe> Pb) as shown in FIG. . Current source 47 when a light pulse is being generated
Then, the recording current is added to the bias current and flows to the semiconductor laser element 21. The power of the laser beam emitted from the semiconductor laser element 21 by the total current of the recording current and the bias current, that is, the recording power is higher than the zero level by Po (Po> Pe) as shown in FIG. 12D. .

When the writing to all the plurality of recording areas is completed, the system controller 11 makes the SCSI-
The CPU 9 is instructed via the IF circuit 10 and the bus 14 to change the power levels of the optimum recording power, erasing power and bias power corresponding to the current writing position of the pickup 1 on the optical disk 13 (step S).
4). The CPU 9 outputs the optimum power level information to the LD driver 5 according to the change instruction. The optimum recording power, erasing power and bias power are predetermined depending on the radial position of the optical disc 13. LD driver 5
Then, according to the power level information, the output bias current value of the current source 45, the output erase current value of the current source 46, and the current source 47.
The output recording current value of is determined.

The system controller 11 is a SCSI-
The CPU 9 is instructed to write the lead-out information in the lead-out area of the optical disc 13 via the IF circuit 10 and the bus 14 (step S5). CPU9
Moves the writing position of the pickup 1 to the lead-out area of the optical disc 13 and instructs the DVD encoder 7 to write the lead-out information. The DVD encoder 7 supplies the recording data corresponding to the lead-out information to the strategy generation circuit 6, and the strategy generation circuit 6 performs the code conversion of the recording data to generate the erase pulse and the write pulse. Readout information is written.

After the writing of the lead-out information is completed, the system controller 11 sends the CPU 9 via the SCSI-IF circuit 10 and the bus 14 the optimum recording power, erasing power and bias corresponding to the innermost position of the optical disk 13. The power level change for each power is instructed (step S6). The CPU 9 outputs the optimum power level information to the LD driver 5 according to the change instruction. And
The system controller 11 uses the SCSI-IF circuit 10
And the optical disk 13 to the CPU 9 via the bus 14.
The recording management information RMD is instructed to be written in the RMA (step S7). The CPU 9 moves the writing position of the pickup 1 to the RMA of the optical disc 13, and instructs the DVD encoder 7 to write the recording management information on the disc. The DVD encoder 7 supplies the recording data corresponding to the recording management information to the strategy generation circuit 6, and the strategy generation circuit 6 code-converts the recording data to generate an erase pulse and a write pulse.
The recording management information RMD is written in A.

After the writing of the recording management information RMD, the system controller 11 writes the lead-in information (finalizing information) to the lead-in area of the optical disc 13 to the CPU 9 via the SCSI-IF circuit 10 and the bus 14. Instruct (step S8). CPU
Reference numeral 9 moves the writing position of the pickup 1 to the lead-in area of the optical disc 13, and instructs the DVD encoder 7 to write the lead-in information of the optical disc 12. D
The VD encoder 7 supplies the recording data corresponding to the lead-in information to the strategy generation circuit 6, and the strategy generation circuit 6 performs code conversion of the recording data to generate the erase pulse and the write pulse, so that the lead-in area of the optical disc 13 is formed. Lead-in information is written.

Writing the recording management information RMD and the lead-in information is the finalizing process. Record management information R
The MD data includes drive maker ID, serial number, model number, strategy code, recording power, time stamp and the like. The lead-in information data includes disc information, maker information, write strategy information, and the like.

The system controller 11 stops the operation of the DVD writer after the writing of the lead-in information is completed.
The PU 9 is instructed (step S9). With the above operation, recording on the optical disk 13 as a test disk is completed. After the data is recorded in the plurality of recording areas in the data area, the optical disc 13 becomes a non-reproducible test disc by returning to the optimum recording power, erasing power and bias power corresponding to the current writing position of the pickup 1. Is prevented.

For the power level change instructions in steps S4 and S6, as in step S22, when the optical disk 13 is a write-once optical disk, the CPU 9 writes the recording power corresponding to one recording area. The optimum power level information of each of the bias power and the bias power is output to the LD driver 5, and the erasing power indicates 0 mW.

FIG. 13 shows an information recording apparatus as another embodiment of the present invention. In the information recording apparatus of FIG. 13, the DVD encoder 7 is provided with a detection unit 7a that detects a buffer underrun in the buffer memory 8. The other structure is the same as that of the information recording apparatus shown in FIG. In the information recording apparatus having the configuration of FIG. 13, the recording operation of step S3 of FIG. 6 is performed in FIG. That is, when it is determined in step S26 that the read address information indicates the final address of the recording area MA, the system controller 11 determines the detection state of the buffer underrun detection unit 7a by the DVD encoder 7, the bus 14, and the SCSI. -Read through the IF circuit 10 and determine whether or not a buffer underrun is detected (step S27a). When the buffer underrun is detected, the process proceeds to step S28. The other recording operation is the same as the recording operation shown in FIG.

Also in the embodiment shown in FIGS. 13 and 14, since the execution of the next step S28 is delayed by the time until the buffer underrun is detected in step S27a, the final address of the current recording area MA is delayed. It is possible to reliably finish writing the image data under the recording conditions corresponding to the above. Further, since the DVD writer performs complicated processing such as enormous data processing and temperature compensation related to laser power during data writing, it may happen that switching of recording conditions such as recording power is not accepted. However, in each of the above-described embodiments, the image data transferred to the data buffer 8 is waited for by waiting for a time sufficient to cause the buffer underrun in step S27 or by detecting the buffer underrun in step S27a. The recording conditions are switched after writing all the information data of. Therefore, the DVD writer can reduce the processing load during data writing, and can reliably receive the command for switching the recording condition.

Further, in each of the above-mentioned embodiments, the recording power and bias power of the laser beam or the recording power, the erasing power and the bias power of each of the plurality of recording areas are set as the recording condition. Not limited to. As the recording condition, the pulse width of the write pulse output from the strategy generation circuit 6 in response to a command from the CPU 9 may be used. Alternatively, the tilt angle formed by the normal line at the laser beam irradiation position on the recording surface of the optical disk 13 and the optical axis direction of the laser beam may be used. Further, the recording condition can be set by using the offset value of the focus servo circuit or the offset value of the tracking servo circuit.

[0037]

As described above, according to the present invention, it is possible to properly record information data in a plurality of recording areas under different recording conditions by the recording means. In particular, the information data is surely recorded in each recording area up to the final address under the recording condition corresponding thereto.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an information recording apparatus to which the present invention has been applied.

FIG. 2 is a block diagram showing a configuration of an LD driver in the device of FIG.

FIG. 3 is a block diagram showing a configuration of an analog processing circuit.

FIG. 4 is a waveform diagram showing detection of an LPP component by a prepit detection circuit.

FIG. 5 is a diagram showing each area of a recording surface of an optical disc.

6 is a flowchart showing the operation of the apparatus of FIG.

FIG. 7 is a diagram showing recording conditions and target values thereof in the case of DVD-R.

FIG. 8 is a diagram showing recording conditions and target values thereof in the case of DVD-RW.

FIG. 9 is a diagram showing recording conditions and target values thereof in the case of DVD-RW.

10 is a flowchart specifically showing a recording operation in the flowchart of FIG.

FIG. 11 is a diagram showing write pulse waveforms and power changes corresponding to recording data in the case of DVD-R.

FIG. 12 is a diagram showing write pulse waveforms and power changes corresponding to recorded data in the case of DVD-RW.

FIG. 13 is a block diagram showing another embodiment of the present invention.

14 is a flowchart showing a recording operation in the case of the apparatus of FIG.

[Explanation of symbols]

1 pickup 2 analog processing circuit 3 DVD decoder 4 LPP decoder 5 LD driver 6 Strategy generation circuit 7 DVD encoder 8 buffer memory 9 CPU 10 SCSI-IF circuit 11 System controller 13 optical disc

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5D090 AA01 BB03 BB04 BB05 CC01                       DD03 FF08 FF30 GG11 HH01                       KK03 KK04 LL08                 5D119 AA38 AA41 BA01 BB02 BB03                       BB04 DA01 EC20 HA45 HA47                       HA49 HA50 HA52                 5D789 AA38 AA41 BA01 BB02 BB03                       BB04 DA01 EC20 HA45 HA47                       HA49 HA50 HA52

Claims (5)

[Claims] 1. An information recording apparatus for recording information data in a plurality of recording areas of a writable disc under different recording conditions by a recording means, the storage storing the information data to be recorded on the disc. Means for transferring the information data stored in the storage means to a buffer memory for storage, sequentially reading the information data stored in the buffer memory, and reading the information data on the disc by the recording means. An information recording apparatus comprising: information recording control means for recording information data; and recording condition switching means for switching recording conditions of the recording means after a buffer underrun occurs in the buffer memory. 2. The recording condition of the recording means is set by a recording power and a bias power of a laser beam for each of the plurality of recording areas when the disc is a write-once optical disc, and the disc is rewritable type. 2. The information recording apparatus according to claim 1, wherein in the case of an optical disc, the recording power, the erasing power, and the bias power of the laser beam for each of the plurality of recording areas are set. 3. The recording condition switching means detects the time when the buffer underrun is caused after detecting the final address of any one recording area of the plurality of recording areas. The information recording apparatus according to claim 1, wherein the recording condition of the recording means is switched. 4. The recording condition switching means has a detecting means for detecting the buffer underrun, and the recording means switching means detects the final address of any one recording area of the plurality of recording areas. 2. The information recording apparatus according to claim 1, wherein the recording condition of the recording unit is switched according to the detection of the buffer underrun. 5. An information recording method for recording information data in a plurality of recording areas of a writable disc by recording means under different recording conditions, wherein the information data stored in advance in a storage means is a buffer memory. The information data stored in the buffer memory is sequentially read, the read information data is recorded on the disc by the recording unit, and a buffer underrun occurs in the buffer memory. An information recording method, characterized in that the recording conditions of the recording means are switched later.