JP4487185B2 - Optical disc apparatus and recording / reproducing method - Google Patents

Description

The present invention relates to an optical disc apparatus and a recording / reproducing method , and is suitable for application to an optical disc apparatus capable of adding and rewriting data to, for example, an optical disc.

  Conventionally, in an optical disc apparatus, data can be read from an optical disc such as a DVD-ROM (Digital Versatile Disc-Read Only Memory), and data can be additionally written on a write-once optical disc such as a DVD-R (Digital Versatile Disc-Recordable). Or data that can be rewritten on a rewritable optical disk such as a DVD-RW (Digital Versatile Disc-ReWritable) has been proposed.

  In such an optical disc apparatus, it is desirable to complete the reading and writing of data in as short a time as possible. Therefore, by increasing the rotation speed of the optical disc, increasing the accuracy of control of the light beam applied to the optical disc, etc. The data read speed and the write speed are increased, that is, the recording / reproducing ability is improved.

  By the way, in order to guarantee accurate recording of data, the optical disk apparatus requires time for writing and reading the data when the data is actually read and verified (verified) immediately after the data is written. Therefore, there is a problem that it takes much time to complete the verification as compared with the case where only writing is performed.

Therefore, in some optical disc apparatuses, writing of data and reading of data are simultaneously performed by simultaneously irradiating the optical disc with two light beams for writing and two for reading. At the same time, a method has been proposed in which verification is completed and the required time is greatly shortened (see, for example, Patent Document 1).
JP-A-8-77581 (page 4, FIG. 1)

  By the way, although the optical disk apparatus having such a configuration can shorten the time required for verification by performing reading simultaneously with data writing using two light beams, both the data writing speed and the data reading speed itself are normal. Since the speed remains unchanged, for example, when only recording or reproduction is performed, the required time cannot be shortened, and the recording / reproduction performance cannot be improved.

The present invention has been made in consideration of the above points, and intends to propose an optical disc apparatus and a recording / reproducing method capable of remarkably improving the recording / reproducing performance.

In order to solve such a problem, the optical disc apparatus of the present invention is an optical disc apparatus for recording at least recording data on an optical disc, and the output power of the light beam is constant power for reproducing or erasing the recording data recorded on the optical disc. A first irradiating means for irradiating the first light beam with the light beam output, a first mode for irradiating the light beam with the output power of the light beam set to a constant power for reproducing recorded data, and the light beam. A second irradiating means for irradiating the second light beam by switching the output power of the second mode to the second mode for irradiating the light beam by setting the output power to fluctuating power for recording the recording data on the optical disc. A first detection means for detecting a first detection signal based on the first light beam applied to the optical disc, and a second light beam applied to the optical disc. Ku second detecting means for detecting a second detection signal, a servo control for irradiating the second light beam to the optical disk by the second irradiation means, the second light beam is irradiated in the first mode If the second light beam is irradiated in the second mode, a control unit is provided that performs the detection based on the first detection signal. .

As a result, in the case of irradiating the second light beam in the first mode having a constant power , the optical disc apparatus performs high-accuracy servo control on the basis of the second detection signal, thereby performing the second light beam. When the second light beam is irradiated in the second mode in which the output power fluctuates, it is detected based on the first light beam having a constant output power. Stable servo control can be performed based on the first detection signal.

The recording / reproducing method of the present invention is a recording / reproducing method for recording record data on an optical disc or reproducing the record data from the optical disc, wherein the output power of the light beam is changed to the value of the record data recorded on the optical disc. A first step of irradiating the first light beam with a constant power for reproducing or erasing, and a first step of irradiating the light beam with the output power of the light beam set to a constant power for reproducing recorded data The second light beam is irradiated by switching between the above mode and the second mode in which the output power of the light beam is set to a power that fluctuates to record the recording data on the optical disc and the light beam is irradiated. a second step, the servo control for irradiating the optical disc a second light beam, the light di if the second light beam is irradiated in the first mode Performs on the basis of a detection signal corresponding to the second light beam irradiated on the click, the when the second light beam is irradiated in the second mode detection signal according to a first light beam And a third step of switching to be performed based on this.

As a result, in this recording / reproducing method, when the second light beam is irradiated in the first mode having a constant power, the servo control is performed based on the second detection signal based on the second light beam. When the reproduction signal can be improved in accuracy and the second light beam is irradiated in the second mode in which the output power varies, the first light beam detected based on the first light beam having a constant output power is detected. Stable servo control can be performed based on the detected signal.

According to the present invention, when the second light beam is irradiated in the first mode having a constant power, the reproduction signal based on the second light beam is performed by performing servo control based on the second detection signal. When the second light beam is irradiated in the second mode in which the output power fluctuates, the first detection detected based on the first light beam with a constant output power Stable servo control can be performed based on the signal . Thus, the present invention can realize an optical disc apparatus capable of remarkably improving the recording / reproducing performance.

Further, according to the present invention, when the second light beam is irradiated in the first mode having a constant power, reproduction based on the second light beam is performed by performing servo control based on the second detection signal. When the second light beam is irradiated in the second mode in which the output power fluctuates while the accuracy of the signal can be increased , the first light detected based on the first light beam having a constant output power is detected. Stable servo control can be performed based on the detection signal . Thus, the present invention can realize a recording / reproducing method capable of remarkably improving the recording / reproducing performance.

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

(1) Configuration of Optical Disc Device In FIG. 1 (A), 1 shows the overall configuration of an optical disc device according to the present invention as a whole. And a signal processing circuit unit 4 for performing various signal processing.

  The optical disc apparatus 1 records data on a write-once optical disc such as a DVD-R (Digital Versatile Disc-Recordable) and rewrites a DVD-RW (Digital Versatile Disc-ReWritable) based on an instruction from an external host device or the like. Type optical disc data can be rewritten, or data can be reproduced from various optical discs such as DVD-ROM (Digital Versatile Disc-Read Only Memory) and recorded DVD-R, DVD-RW.

  FIG. 1A shows a top view of the optical pickup unit 2, and the optical pickup unit 2 receives two emitted light beams LA 1 and LA 2 from the laser diode 10 under the control of the signal processing circuit unit 4. It is made to fire. The laser diode 10 emits two emission light beams LA1 and LA2 from two laser emission locations that are actually slightly separated from each other. However, for convenience of explanation, the emission light beams LA1 and LA2 are overlapped in the figure. It shows.

  The optical pickup unit 2 causes the emitted light beams LA1 and LA2 emitted from the laser diode 10 to enter the anamorphic prism 14 through the grating 11, the polarization beam splitter 12, and the collimator lens 13 in this order.

  The anamorphic prism 14 transmits a part of the emitted light beams LA1 and LA2 to be emitted light beams LB1 and LB2, irradiates the rising mirror 17, and reflects a part of the emitted light beams LA1 and LA2 for monitoring. The light beams LC1 and LC2 are used, and this is irradiated onto the front monitor photodetector 16 via the collimator lens 15.

  The front monitor photodetector 16 photoelectrically converts the monitor light beams LC1 and LC2 and sends front monitor signals SFM1 and SFM2 corresponding to the conversion results to the signal processing circuit unit 4. In response to this, the signal processing circuit unit 4 feedback-controls the respective emission intensities of the emitted light beams LA1 and LA2 emitted from the laser diode 10 (details will be described later).

  On the other hand, in FIG. 1B showing a side view of the optical pickup unit 2, the optical pickup unit 2 raises the outgoing light beams LB1 and LB2 transmitted through the anamorphic prism 14 by the raising mirror 17, and The emitted light beams LB1 and LB2 are irradiated onto the optical disc 100 through the quarter-wave plate 18 and the objective lens 19 in sequence.

  Here, as shown in FIG. 2, the optical disc apparatus 1 is configured to irradiate the recording track of the optical disc 100 with the spot SPT1 by the emission light beam LB1 as the first light beam and the emission light beam LB2 as the second light beam. The spot SPT2 is formed on the same recording track. Therefore, when the optical disc 100 is rotated, the optical disc device 1 follows an outgoing light beam LB2 so that an arbitrary irradiated spot on the recording track is followed immediately after the preceding outgoing light beam LB1 is irradiated. Irradiate.

  Incidentally, in an actual optical disc 100 such as a DVD-R or DVD-RW, a recording track for recording data is called a “groove” and is formed in a groove shape having waviness with a predetermined amplitude and a predetermined frequency. Lands are formed between the grooves and land pre-pits (LPP) are provided in accordance with a predetermined rule, but are simplified in FIG.

  The optical pickup unit 2 (FIG. 1A) reflects the outgoing light beams LB1 and LB2 by the optical disc 100, and the reflected light beams LD1 and LD2 at this time are sequentially passed through the objective lens 19 and the quarter wavelength plate 18. It is returned to the horizontal direction by the rising mirror 17 and is incident on the anamorphic prism 14 (FIG. 1A).

  Subsequently, the optical pickup unit 2 transmits the reflected light beams LD1 and LD2 transmitted through the anamorphic prism 14 through the collimator lens 13 and reflected by the polarization beam splitter 12 through the quarter wavelength plate 20, and then the multilens 21. , Each of the two sub-beams is split and irradiated to the main photodetector 22.

As shown in FIG. 3, the main photodetector 22 includes detection units 22A1 to 22D1 for detecting the reflected light beam LD1, detection units 22E1 and 22F1 for detecting two sub beams of the reflected light beam LD1, and 22G1, 22H1, and detection units 22A2 to 22D2 for detecting the reflected light beam LD2, and detection units 22E2, 22F2, and 22G2, 22H2 for detecting two sub beams of the reflected light beam LD2, respectively. is doing.

  The main photodetector 22 photoelectrically converts the reflected light beams LD1 and LD2 and their sub beams by the detection units 22A1 to 22H1 and 22A2 to 22H2, respectively, and detects detection signals A1 to H1 and A2 to H2 corresponding to the conversion results of the respective detection units. Is sent to the signal processing circuit unit 4. The signal processing circuit unit 4 performs various signal processing such as generating a reproduction RF signal or performing focus control and tracking control by performing predetermined arithmetic processing (details will be described later).

  Incidentally, since the optical paths of the emitted light beams LA1 and LA2 and the emitted light beams LB1 and LB2 are close to each other, the optical disk apparatus 1 performs focus control and tracking control on one emitted light beam LB1, thereby allowing the other outgoing light beam LB1 to be output. Focusing and tracking can also be adjusted for the incident light beam LB2.

(2) Circuit Configuration of Optical Disc Device 1 Next, the circuit configuration of the optical disc device 1 will be described. As shown in FIG. 4, the optical disc apparatus 1 is totally controlled by a control unit 30 having a CPU (Central Processing Unit) configuration, and data is recorded and reproduced based on instructions from an external host device 200. Has been made to do.

  As described above, the optical disc apparatus 1 is configured to perform signal processing for two systems in order to simultaneously irradiate the optical disc 100 with the two light beams LB1 and LB2, but the same applies to both systems. In order to perform the processing, the processing in both systems will be described below collectively.

(2-1) Data Rewriting and Writing When the control unit 30 of the optical disc apparatus 1 receives a data recording instruction from the host apparatus 200, the data D to be recorded together with the recording instruction and the address A for recording the data D are recorded. Are sent to the 8-16 encoder circuit 31.

  The control unit 30 has a built-in memory, and the data D is copied and temporarily stored in the memory.

  The 8-16 encoder circuit 31 generates 16-bit recording data DW (DW1 or DW2) suitable for recording on the optical disc 100 by performing 8-16 modulation processing on the 8-bit data D. The recording data DW is sent to the write strategy generation circuit 32 in synchronization with the write clock supplied from the write clock generation circuit 36.

  The 8-16 encoder circuit 31 sends address information IA representing the address A acquired from the control unit 30 to the write strategy generation circuit 32, the binarization circuit 46, and the servo processing circuit 38.

  In response to this, the servo processing circuit 38 controls the spindle motor 42, the thread motor 43, and the two-axis actuator 44 of the driving unit 3 via the spindle motor driver 39, the thread motor driver 40, and the two-axis motor driver 41, respectively. As a result, the rotational speed of the optical disc 100 is adjusted and the position of the optical pickup unit 2 in the tracking direction is adjusted, and the emitted light beam LB1 is focused on the location corresponding to the address information IA of the optical disc 100 (FIG. 2). To irradiate.

  Incidentally, since the irradiation interval between the outgoing light beam LB1 and the outgoing light beam LB2 is fixed in the optical disc apparatus 1, when the outgoing light beam LB1 is applied to the first irradiation location corresponding to the address IA, the irradiation is performed. Based on the interval, the address of the second irradiation point irradiated with the outgoing light beam LB2 is also accurately recognized.

  Further, the spindle motor 42 and the thread motor 43 respectively generate detection signals according to the actual rotation amount and movement amount of each motor by the encoder 42A and the thread encoder 43A, and send them to the servo processing circuit 38. The servo control circuit 38 performs feedback control on the spindle motor 42 and the sled motor 43 based on the detection signal.

  Based on the address information IA, the write strategy generation circuit 32 generates a timing signal T and sends it to the automatic power control circuit 33 in order to record data at a location corresponding to the address information IA of the optical disc 100.

  Further, the write strategy generation circuit 32 switches the irradiation mode of the irradiation light beam LA (LA1 or LA2) irradiated from the laser diode 10 to the “writing irradiation mode” based on an instruction from the control unit 30, and further 8-16 encoder. Based on the recording data DW acquired from the circuit 31, modulation is performed to a write strategy (that is, a pulse pattern at the time of writing) corresponding to the type of the optical disk 100 (that is, DVD-R, DVD-RW, etc.).

  By the way, in the rewritable DVD-RW, data is rewritten using a phase change between a crystalline state and an amorphous state of a signal recording film, and light having a write power Pw is applied to the signal recording film. Immediately after irradiation with the beam, the recording mark is formed by bringing only a specific portion into an amorphous state, and the recording mark is erased by returning to the crystalline state again by irradiating the light beam with the erase power Pe. Has been made.

  For this reason, the write strategy generation circuit 32 generates bias power Pb, erase power Pe, and write power Pw as shown in FIG. 5B based on the recording data DW whose waveform is shown in FIG. Modulated into a pulsed rewrite waveform signal SRW (SRW1 or SRW2) that combines the powers of the three stages, and the rewrite waveform signal SRW at a timing according to the write clock CWR (CWR1 or CWR2) supplied from the write clock generation circuit 36. Is sent to the laser diode 10.

  Incidentally, when writing data to the write-once DVD-R, the write strategy generation circuit 32 sets the irradiation mode of the irradiation light beam LA1 irradiated from the laser diode 10 in the same manner as in the case of the rewritable DVD-RW. However, unlike the rewrite waveform signal SRW shown in FIG. 5B, a write waveform signal SW (SW1 or SW2) having a waveform corresponding to the DVD-R is generated. .

  The automatic power control circuit 33 (FIG. 4) sends a power control signal PC (PC1 or PC2) to the laser diode 10 based on the timing signal T supplied from the write strategy generation circuit 32.

  The laser diode 10 adjusts the timing and irradiation intensity based on the power control signal PC supplied from the automatic power control circuit 33, and has a pulse pattern light beam based on the rewrite waveform signal SRW supplied from the write strategy generation circuit 32. Fire LA.

  At this time, the front monitor photodetector 16 receives the monitor light beam LC (LC1 or LC2) in which a part of the emitted light beam LA is reflected by the anamorphic prism 14 (FIG. 1), and the intensity of the monitor light beam LC by photoelectric conversion. A front monitor signal SFM (SFM 1 or SFM 2) corresponding to is generated and sent to the automatic power control circuit 33.

  The automatic power control circuit 33 adjusts the light beam LA emitted from the laser diode 10 to the power instructed by the automatic power control circuit 33 by performing feedback control of the power control signal PC according to the supplied front monitor signal SFM. It is made to do.

  As a result, the optical disc apparatus 1 emits the emitted light beam LA from the laser diode 10 and irradiates the optical disc 100 as the emitted light beam LB (LB1 or LB2) through the various optical components (FIG. 1) of the optical pickup unit 2 sequentially. Thus, recording marks corresponding to the recording data DW are sequentially formed on the signal recording film of the optical disc 100.

  At this time, the optical disc apparatus 1 detects the reflected light beam LD (LD1 or LD2) reflected by the optical disc 100 by the main photodetector 22, and sends the detection signals A1 to H1 or A2 to H2 to the matrix amplifier 34.

  The matrix amplifier 34 generates a focus error signal FE (FE1 or FE2) according to the astigmatism method on the basis of the detection signals A1 to H1 or A2 to H2 supplied from the main photodetector 22 as follows:

Further, the tracking error signal TE (TE1 or TE2) is calculated by the following formula using a predetermined constant K according to the DPP (Differential Push Pull) method.

And the focus error signal FE and tracking error signal TE are sent to the servo processing circuit 38 .

The servo processing circuit 38 adjusts the focus of the emitted light beam LB by controlling the biaxial actuator 44 via the biaxial motor driver 41 based on the focus error signal FE, and based on the tracking error signal TE. By controlling the thread motor 43 via the thread motor driver 40, the tracking adjustment of the emitted light beam LB is performed.

  The matrix amplifier 34 generates a push-pull signal PP (PP1 or PP2) based on the detection signals A1 to D1 or A2 to D2 supplied from the main photo detector 22 by the following formula.

And the signal level of the push-pull signal PP is automatically adjusted by the push-pull AGC circuit 35 and then sent to the clock generation circuit 36 and the wobble data demodulation circuit 37.

  The clock generation circuit 36 generates a write clock signal CWR based on the push-pull signal PP and sends it to the 8-16 encoder circuit 31 and the write strategy generation circuit 32. The wobble data demodulation circuit 37 generates wobble data WB (WB1 or WB2) based on the push-pull signal PP and sends it to the 8-16 encoder circuit 31.

  The 8-16 encoder circuit 31 recognizes the correct address of the optical disc 100 to which the outgoing light beam LB is currently irradiated based on the wobble data WB, and records data DW to be recorded next in accordance with the recognition result. Are sequentially sent to the write strategy generation circuit 32 at a timing in accordance with the write clock signal CWR.

  As described above, the optical disk apparatus 1 uses the “write irradiation mode” based on the rewrite waveform signal SRW for the rewritable optical disk 100 such as DVD-RW based on the data D and the address A supplied from the host apparatus 200. The existing data at the location corresponding to the address A can be rewritten to the data D by irradiating the emitted light beam LB.

  Further, the optical disc apparatus 1 irradiates the write-once optical disc 100 such as a DVD-R with the emitted light beam LB in the “write irradiation mode” based on the write waveform signal SW, thereby causing the address A of the optical disc 100 to be addressed. The data D can be written in a location corresponding to the above.

(2-2) Reading Data When the control unit 30 of the optical disc apparatus 1 receives a data reproduction instruction from the host apparatus 200, the control unit 30 acquires an address A where data to be reproduced is recorded together with the reproduction instruction. Is sent to the 8-16 encoder circuit 31.

  The 8-16 encoder circuit 31 generates address information IA representing the address A based on the address A acquired from the control unit 30, and the address information IA is generated from the write strategy generation circuit 32, the binarization circuit 46, and The data is sent to the servo processing circuit 38.

  The write strategy generation circuit 32 first switches the irradiation mode of the irradiation light beam LA irradiated from the laser diode 10 to the “reading irradiation mode” based on an instruction from the control unit 30, and then has a constant power suitable for data reading. A read waveform signal SR (SR1 or SR2) is generated and sent to the laser diode 10, and a timing signal T is generated so as to keep the power of the emitted light beam LA emitted from the laser diode 10 constant, and an automatic power control circuit Send to 33.

  The automatic power control circuit 33 sends a power control signal PC to the laser diode 10 based on the timing signal T supplied from the write strategy generation circuit 32.

  The laser diode 10 emits a light beam LA having a constant power based on the read waveform signal SR supplied from the write strategy generation circuit 32 and the power control signal PC supplied from the automatic power control circuit 33.

  The automatic power control circuit 33 feedback-controls the power control signal PC in accordance with the front monitor signal SFM supplied from the front monitor photodetector 16 in the same manner as when rewriting data.

  As a result, the optical disc apparatus 1 emits a light beam LA having a constant power from the laser diode 10, irradiates the optical disc 100 with the outgoing light beam LB via the optical system of the optical pickup unit 2 sequentially, and the reflected light is reflected. The light beam LD is detected by the main photodetector 22 and the detection signals A1 to H1 or A2 to H2 are sent to the matrix amplifier 34 and the RF amplifier equalizer 45.

  The matrix amplifier 34 calculates the focus error signal FE and the tracking error signal TE based on the above equations (1) and (2) based on the detection signals A1 to H1 or A2 to H2 supplied from the main photo detector 22. These are supplied to the servo processing circuit 37.

  The servo processing circuit 37 adjusts the focus of the outgoing light beam LB based on the focus error signal FE, and performs the tracking adjustment of the outgoing light beam LB based on the tracking error signal TE, as in the case of data rewriting.

  On the other hand, the RF amplifier equalizer 45 converts the reproduction RF signal SRF (SRF1 or SRF2) into the following formula based on the detection signals A1 to D1 or A2 to D2.

And is sent to the binarization circuit 46.

  The binarization circuit 46 has an internal PLL circuit, generates binary read data DB (DB1 or DB2) binarized based on the reproduction RF signal SRF, and reads out based on the reproduction RF signal SRF. Clock signals CR (CR1 or CR2) are generated and sent to the 8-16 decoder circuit 47.

  The 8-16 decoder circuit 47 sequentially performs processing such as 8-16 demodulation processing and error correction based on the read binary data DB and the read clock signal CR, and finally obtained reproduction data DR (DR1 or DR2). Then, an error signal ER (ER1 or ER2) is sent to the control unit 30. In response to this, the control unit 30 sends the reproduction data DR as data D to the host device 200.

  As described above, the optical disc apparatus 1 applies the outgoing light beam LB in the “read irradiation mode” based on the read waveform signal SR to the optical disc 100 on which the data D is recorded based on the address A supplied from the host device 200. By irradiating, the data D can be read and reproduced from the location corresponding to the address A.

(2-3) Data Deletion When the control unit 30 of the optical disc apparatus 1 accepts a data erase instruction from the host apparatus 200, it receives an address A where data to be erased is recorded together with the erase instruction. It is sent to the 8-16 encoder circuit 31.

  The 8-16 encoder circuit 31 generates address information IA representing the address A based on the address A acquired from the control unit 30, and the address information IA is generated from the write strategy generation circuit 32, the binarization circuit 46, and The data is sent to the servo processing circuit 38.

  The write strategy generation circuit 32 first switches the irradiation mode of the irradiation light beam LA irradiated from the laser diode 10 to the “erasing mode” based on an instruction from the control unit 30, and then erases at a constant power suitable for erasing data. A waveform signal SE (SE1 or SE2) is generated and sent to the laser diode 10, and a timing signal T is generated so as to keep the power of the emitted light beam LA emitted from the laser diode 10 constant, thereby generating an automatic power control circuit 33. To send.

  The automatic power control circuit 33 sends a power control signal PC to the laser diode 10 based on the timing signal T supplied from the write strategy generation circuit 32.

  The laser diode 10 emits a light beam LA having a constant power based on the erase waveform signal SE supplied from the write strategy generation circuit 32 and the power control signal PC supplied from the automatic power control circuit 33.

  The automatic power control circuit 33 feedback-controls the power control signal PC in accordance with the front monitor signal SFM supplied from the front monitor photodetector 16 in the same manner as when rewriting data.

  As a result, the optical disc apparatus 1 emits the emitted light beam LA based on the erasure waveform signal SE with a constant power from the laser diode 10, and the emitted light of the erase power Pe through the various optical components (FIG. 1) of the optical pickup unit 2 sequentially. The optical disc 100 is irradiated with the beam LB, the portion corresponding to the address A is returned to the crystalline state again, and the recording mark is erased.

  As described above, the optical disc apparatus 1 applies the emitted light beam LB in the “erasing irradiation mode” based on the erasing signal SE to the rewritable optical disc 100 such as a DVD-RW based on the address A supplied from the host device 200. By irradiating, data at a location corresponding to the address A can be erased.

(3) Switching of Operation Modes By the way, the optical disc apparatus 1 can irradiate the two light beams of the emitted light beams LB1 and LB2 simultaneously to the optical disc 100 by performing the two-system signal processing as described above. Based on an instruction from the host device 200 (FIG. 4), data recording on a write-once optical disc, rewriting of data on a rewritable optical disc, or data from various optical discs is performed using the two light beams. It is made to play.

  In the following, the optical disk apparatus 1 uses the two light beams of the emitted light beams LB1 and LB2 to perform data recording, rewriting, and reproduction, a two-beam recording operation mode, a two-beam rewriting operation mode, and a two-beam reproduction operation mode. Each will be described.

(3-1) Two-Beam Recording Operation Mode The optical disc apparatus 1 is configured to record data in the “two-beam recording operation mode” mainly on a write-once optical disc 100 such as a DVD-R.

  The control unit 30 of the optical disc apparatus 1 uses the two signal processing circuits in the signal processing circuit unit 4 by switching the operation mode to the “two-beam recording operation mode” based on an instruction from the host device 200. The optical disk 100 is simultaneously irradiated with two light beams, the outgoing light beam LB1 changed to “writing irradiation mode” and the outgoing light beam LB2 changed to “reading irradiation mode”.

  In this case, the optical disc apparatus 1 reads data by the outgoing light beam LB2 that follows in parallel with the data writing by the preceding outgoing light beam LB1, writes data to the optical disc 100 by the outgoing light beam LB1, Immediately after that, the written data is read based on the reflected light of the emitted light beam LB2, and the reproduction data DR2 is obtained.

  Subsequently, the control unit 30 of the optical disc apparatus 1 compares the pre-write data D stored in the built-in memory with the reproduction data DR2 generated based on the reflected light beam LD2 of the outgoing light beam LB2. Based on the control of the wobble data demodulation circuit 37, the reproduction state of the reproduction data DR2 is recognized, and the emission light beam LB1 is optimized so that the reproduction state is optimum, that is, the recording state by the emission light beam LB1 is optimum. So-called Running OPC (Optimum Power Control) is performed.

  As a result, even if the recording characteristics of the optical disc apparatus 1 vary due to differences in recording characteristics due to differences in the manufacturers of the respective optical discs 100, or differences in recording locations on the inner and outer peripheral sides of one optical disc 100, The optical disc 100 can always be irradiated with the emitted light beam LB1 having the optimum power, and the optimum recording state can be obtained.

  For this reason, the optical disc apparatus 1 does not require optimization adjustment (OPC) of the emitted light beam LB1, which is generally performed as a preprocessing when data is recorded on the write once optical disc 100, and the data recording speed itself is Although not changed, the total time required for data recording can be reduced by the amount that the preprocessing is not required.

  Further, the optical disk apparatus 1 uses the servo processing circuit 38 (FIG. 4) in this “two-beam recording operation mode” based on the reflected light of the outgoing light beam LB2 in the “reading irradiation mode”, that is, always at a constant power. Servo control is performed.

  As a result, the optical disc apparatus 1 performs servo control that is more stable than in the “write irradiation mode”, that is, when servo control is performed based on the reflected light of the emitted light beam LB1 whose power changes in a pulse shape. be able to.

(3-2) Two-Beam Rewriting Operation Mode The optical disc apparatus 1 is configured to rewrite data in the “two-beam rewriting operation mode” mainly for a rewritable optical disc 100 such as a DVD-RW.

  The control unit 30 of the optical disc apparatus 1 switches the operation mode to the “2-beam rewrite operation mode” based on an instruction from the host apparatus 200, thereby changing the emission light beam LB1 changed to the “erasing irradiation mode” and “writing irradiation”. The optical disk 100 is simultaneously irradiated with two light beams having the emission light beam LB2 changed to “mode”.

  In this case, the optical disc apparatus 1 writes new data by the outgoing light beam LB2 that follows in parallel with the erasure of the existing data by the preceding outgoing light beam LB1, and the existing optical disc 100 is written by the outgoing light beam LB1. And immediately after that, new data is written to the erased portion by the emitted light beam LB2.

  At this time, the optical disc apparatus 1 makes the outgoing light in order to make the signal recording film of the optical disc 100 uniform from the mixed state of the amorphous state and the crystalline state to the crystalline state, in which the existing data is recorded by the outgoing light beam LB1. Recording marks can be stably formed by the beam LB2 and recorded as data.

  For this reason, the optical disc apparatus 1 may greatly deteriorate the recording mark formation state even when data is rewritten at a speed higher than a prescribed rewriting speed based on rewriting with one light beam (so-called direct overwrite). In this “two-beam rewrite operation mode” experiment, it was confirmed that data could be recorded normally even if the speed was increased by about 1.6 times the prescribed rewrite speed.

  The optical disc apparatus 1 performs servo control in the “two-beam rewriting operation mode” based on the reflected light of the emission light beam LB1 in the “erasing irradiation mode”, that is, the power is always constant.

  As a result, the optical disc apparatus 1 performs more stable servo control than in the case of performing the servo control based on the reflected light of the emitted light beam LB2 whose power is changed in a pulse shape in the “writing irradiation mode”. Has been made to get.

(3-3) Two-Beam Playback Operation Mode The optical disc apparatus 1 is capable of transferring data from the optical disc 100 capable of reproducing data, such as a DVD-ROM, a recorded DVD-R, and a DVD-RW, by the “two-beam playback operation mode”. It is made to play.

  The control unit 30 of the optical disk device 1 first uses the two signal processing circuits of the signal processing circuit unit 4 by switching the operation mode to the “two-beam reproduction operation mode” based on an instruction from the host device 200. Both the emitted light beam LB1 and the emitted light beam LB2 are changed to the “reading irradiation mode” to irradiate the optical disc 100.

  In this case, the control unit 30 of the optical disc apparatus 1 acquires the reproduction data DR1 and DR2 and the error signals ER1 and ER2 based on the reproduction RF signal SRF1 and the reproduction RF signal SRF2, and obtains two types of reproduction data DR1 and DR2. Predetermined error correction processing is performed based on the error signals ER1 and ER2, and finally data D is generated and sent to the host device 200.

  As a result, when the control unit 30 of the optical disc apparatus 1 reads data from the optical disc 100 at a normal reading speed, even if the optical disc 100 has many scratches, dirt, etc., it reads using one light beam. It is possible to generate data D with less errors (that is, high quality) and send it to the host device 200 as compared with the case of the host device 200.

  Furthermore, even if the errors in the reproduction data DR1 and DR2 increase by reading data from the optical disk 100 at a higher speed than usual, the optical disk device 1 finally generates data D having the same quality as normal by error correction processing. Therefore, data can be read from the optical disc 100 at a higher speed than usual.

  Incidentally, the optical disc apparatus 1 performs servo control in the “two-beam reproduction operation mode” based on the reflected light of the outgoing light beam LB1 in the “reading irradiation mode”, that is, the power is always constant. Instead of this, servo control may be performed based on the reflected light of the outgoing light beam LB2.

  In addition to the “two-beam recording operation mode”, “two-beam rewrite operation mode”, and “two-beam reproduction operation mode” using the above-described two light beams, the optical disc apparatus has one outgoing light beam LB1 or LB2. There are also operation modes in which data is recorded, rewritten, or reproduced using only these, and these operation modes can be freely switched based on an instruction from the host device 200 (FIG. 4).

(4) Operation and Effect In the above configuration, the optical disc apparatus 1 sets the operation mode to “2-beam recording operation mode”, “2-beam rewrite operation mode”, or “2-beam reproduction operation” based on an instruction from the host apparatus 200. By switching to “mode”, the irradiation modes of the emitted light beam LB1 and the emitted light beam LB2 are changed to any one of “writing irradiation mode”, “reading irradiation mode”, and “erasing irradiation mode”, respectively. Data recording, rewriting, and reproduction are performed on the optical disc 100 using both the LB1 and the emitted light beam LB2.

  When the optical disk apparatus 1 records data on the write-once type optical disk 100 in the “two-beam recording operation mode”, the emitted light beam LB1 is changed to the “writing irradiation mode” under the control of the control unit 30. At the same time, by changing the outgoing light beam LB2 to the “reading irradiation mode”, data is written to the optical disc 100 by the outgoing light beam LB1, and immediately thereafter, the data is read based on the reflected light of the outgoing light beam LB2, The reproduction data DR2 is acquired, the reproduction state of the data is recognized based on the reproduction data DR2, and the running OPC of the emitted light beam LB1 is performed so that the reproduction state is optimized.

  Accordingly, the optical disc apparatus 1 always irradiates the optical disc 100 with the emitted light beam LB1 having the optimum power without being affected by variations in recording characteristics of the optical disc 100, etc., in this “two-beam recording operation mode”. And an optimum recording state can be obtained.

  For this reason, the optical disc apparatus 1 does not require optimization adjustment (OPC) of the emitted light beam LB that is generally performed as a pre-processing when data is recorded on the write-once type optical disc 100, and the total required for data recording. Time can be shortened.

  At this time, the optical disc apparatus 1 performs servo control based on the reflected light of the outgoing light beam LB2 whose power is always constant in the “two-beam recording operation mode”, so that the outgoing light beam whose power changes in a pulse shape. Compared with the case where servo control is performed based on the reflected light of LB1, more stable servo control can be performed.

  Further, when the optical disk apparatus 1 rewrites data to the rewritable optical disk 100 in the “two-beam rewriting operation mode”, the emitted light beam LB1 is changed to the “erasing irradiation mode” under the control of the control unit 30. At the same time, the emitted light beam LB2 is changed to the “writing irradiation mode”, whereby the data on the optical disc 100 is erased by the emitted light beam LB1, and new data is written by the emitted light beam LB2 immediately thereafter.

  Therefore, the optical disc apparatus 1 can form a new recording mark stably by the outgoing light beam LB2 by making the signal recording film of the optical disc 100 uniform in the crystalline state by the outgoing light beam LB1, and the prescribed rewriting speed. Even when data is rewritten at a speed approximately 1.6 times higher than the above, data can be recorded normally without deteriorating the formation state of the recording mark, and the time required for rewriting the data can be reduced. Can do.

  At this time, the optical disc apparatus 1 performs servo control based on the reflected light of the outgoing light beam LB1 whose power is always constant in this “two-beam rewriting operation mode”, so that the outgoing light beam whose power changes in a pulse shape. Compared to the case where servo control is performed based on the reflected light of LB2, more stable servo control can be performed.

  Further, when reproducing data from the optical disc 100 in the “two-beam reproduction operation mode”, the optical disc apparatus 1 changes both the emitted light beam LB1 and the emitted light beam LB2 to the “reading irradiation mode”, thereby the emitted light beam. The optical disk 100 is irradiated with LB1 and the emitted light beam LB2, respectively, and the respective reproduction data DR1 and DR2 and error signals ER1 and ER2 are acquired and subjected to predetermined error correction processing based on these, and finally, Data D is generated.

  Therefore, when the optical disk apparatus 1 reads data from the optical disk 100 at a normal reading speed, even if the optical disk 100 has a large number of scratches, dirt, etc., it is compared with the case where data is read using one light beam. Therefore, it is possible to generate data with less errors, that is, high-quality data, and improve the data reproduction capability.

  In addition, even if errors in the reproduction data DR1 and DR2 increase by reading data from the optical disk 100 at a higher speed than usual, the optical disc apparatus 1 performs error correction processing based on both the reproduction data DR1 and DR2. Finally, since data D having the same quality as normal can be generated, data can be read from the optical disc 100 at a higher speed than normal, and the data read time can be shortened.

  According to the above configuration, the optical disc apparatus 1 changes the outgoing light beam LB1 to the “writing irradiation mode” and “reads” the outgoing light beam LB2 in the “two-beam recording operation mode” based on an instruction from the host device 200. By changing to the “irradiation mode”, the total time required for data recording can be shortened by performing the running OPC of the outgoing light beam LB1, and in the “two-beam rewriting operation mode”, the outgoing light beam LB1 is “erased irradiation”. By changing the output light beam LB2 to the “writing irradiation mode”, the existing data can be erased and new data can be written at high speed on the signal recording film that has been made uniform in the crystalline state. In the “two-beam reproduction operation mode”, both the outgoing light beam LB1 and the outgoing light beam LB2 are “read irradiation mode”. High-quality data with little error after performing error correction processing by changing the data can be read out or generated, or at high speed.

(5) Other Embodiments In the above-described embodiment, the case where data is recorded in the “two-beam recording operation mode” on the write-once optical disc 100 such as a DVD-R has been described. The present invention is not limited to this. For example, data may be recorded in this “two-beam recording operation mode” on a rewritable optical disc 100 such as a DVD-RW.

  In the above-described embodiment, the optical pickup unit 2 emits two light beams of the emitted light beams LA1 and LA2 from the laser diode 10, and the main photodetector 22 emits two light beams of the reflected light beams LD1 and LD2. Further, the case where the sub beam is detected and the signal processing circuit unit 4 performs the two systems of signal processing has been described. However, the present invention is not limited to this. For example, the optical pickup unit 2 includes the laser diodes 10 to 3. It is also possible to emit three light beams and detect the three light beams and their sub-beams by the main photo detector 22 and perform signal processing of three systems in the signal processing circuit unit 4.

  In this case, when rewriting data, the optical disc apparatus 1 switches to the “3-beam recording operation mode” using, for example, three light beams, switches the first light beam to the “erasing irradiation mode”, and sets the second light By changing the beam to the “writing irradiation mode” and the third light beam to the “reading irradiation mode”, new data can be written at a high speed after erasing the existing data and running OPC It can be performed.

  Further, in the above-described embodiment, the case where the emitted light beam LB1 is irradiated to the portion corresponding to the address information IA of the optical disc 100 has been described. However, the present invention is not limited to this, and the emitted light beam LB2 is You may make it irradiate the location corresponding to the address information IA, or you may switch which of the emitted light beams LB1 or LB2 is irradiated to the location corresponding to the address information IA.

  Further, in the above-described embodiment, in order to generate the focus error signal FE according to the astigmatism method and the tracking error signal TE according to the DPP method, the detection units 22A1 to H1 and the detection units 22A2 to H2 of the main photodetector 22 are used. However, the present invention is not limited to this, and various configurations may be adopted in accordance with a method for generating a focus error signal and a tracking error signal.

  Further, in the above-described embodiment, the case where the control unit 30 of the optical disc apparatus 1 switches the operation mode based on an instruction from the host device 200 has been described. However, the present invention is not limited to this, and for example, the operation unit 70 An “operation mode changeover switch” may be provided in FIG. 1 and the operation mode may be changed based on a user operation instruction via the “operation mode changeover switch”.

  In this case, when the instruction from the host device 200 and the operation instruction by the operation mode change switch are different, it may be possible to set in advance which is to be prioritized.

  Furthermore, in the above-described embodiment, the reflected light of the outgoing light beam LB1 is used in the “two-beam rewriting operation mode” based on the reflected light of the outgoing light beam LB2 in the “two-beam recording operation mode”. Based on the above description, the servo control is described. However, the present invention is not limited to this. In each operation mode, the focus error signal FE1 and the tracking error signal TE1 obtained from the reflected light of the emitted light beam LB1 Servo control may be performed by averaging the focus error signal FE2 and the tracking error signal TE2 obtained from the reflected light of the emitted light beam LB2.

  Furthermore, in the above-described embodiment, in the “two-beam recording operation mode”, the control unit 30 compares the data D before writing stored in the memory built in the control unit 30 with the reproduction data RD. However, the present invention is not limited to this. For example, a dedicated data comparison circuit is provided, and the data comparison circuit compares the data D before writing with the reproduction data RD. Also good.

  Furthermore, in the above-described embodiment, the optical disc apparatus 1 records, rewrites and reproduces data with respect to the optical disc 100 which is a write-once DVD-R, a rewritable DVD-RW utilizing phase change, and a DVD-ROM. However, the present invention is not limited to this, for example, a write-once CD-R (Compact Disc-Recordable) or a rewritable CD-RW (Compact Disc-ReWritable) using phase change. Data recording, rewriting, and reproduction may be performed on various other optical discs.

  Furthermore, in the above-described embodiment, the optical disk includes the laser diode 10 as the first light beam irradiation means and the second light beam irradiation means, and the control unit 30 as the first light beam adjustment means, the reproduction means, and the control means. Although the case where the apparatus is configured has been described, the present invention is not limited to this, and the first light beam irradiation means, the second light beam irradiation means, the first light beam adjustment means, and the reproduction, which have other various circuit configurations. The optical disk apparatus may be configured by the means and the control means.

  INDUSTRIAL APPLICABILITY The present invention can be used in an optical disc apparatus that records data on a write-once optical disc, rewrites data on a rewritable optical disc using phase change, and reproduces data from the recorded optical disc. .

It is a basic diagram which shows the structure of the optical disk apparatus by this invention. It is a basic diagram with which it uses for description of the irradiation position of a light beam. It is a basic diagram which shows the structure of a photodetector. It is a block diagram which shows the circuit structure of an optical disk apparatus. It is a basic diagram which shows the example of the write strategy at the time of data rewriting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk apparatus, 2 ... Optical pick-up part, 3 ... Drive part, 4 ... Signal processing circuit part, 10 ... Laser diode, 22 ... Main photo detector, 30 ... Control part, 32 ... Write strategy Generation circuit, 38... Servo processing circuit, 100... Optical disk, 200.

Claims (4)

An optical disc apparatus for recording at least recording data on an optical disc,
A first irradiating means for irradiating the first light beam with the output power of the light beam set to a constant power for reproducing or erasing the recorded data recorded on the optical disc;
A first mode in which the output power of the light beam is set to a constant power for reproducing the recording data and the light beam is irradiated, and the output power of the light beam is changed to a power that varies in order to record the recording data on the optical disc. A second irradiating means for irradiating the second light beam by switching between the second mode for irradiating the light beam with setting;
First detection means for detecting a first detection signal based on the first light beam applied to the optical disc;
Second detection means for detecting a second detection signal based on the second light beam applied to the optical disc;
Servo control for irradiating the optical disk with the second light beam by the second irradiating means, and when the second light beam is radiated in the first mode, It performs based, optical disc and a control means when the second light beam is irradiated in the second mode performed based on the first detection signal. The control means is based on the address information of the recording position irradiated with the second light beam, and based on the second detection signal when the second light beam is irradiated in the first mode. while recognizing Te, the optical disk apparatus according to recognized claim 1 based on the first detection signal when the second light beam is irradiated in the second mode. The optical disk apparatus according to claim 2 , wherein the address information is included in wobble information recorded in a groove on the optical disk. A recording / reproducing method for recording record data on an optical disc or reproducing the record data from the optical disc,
A first step of irradiating the first light beam with the output power of the light beam set to a constant power for reproducing or erasing the recorded data recorded on the optical disc;
A first mode in which the output power of the light beam is set to a constant power for reproducing the recording data and the light beam is irradiated, and the output power of the light beam is changed to a power that varies in order to record the recording data on the optical disc. A second step of setting and switching to the second mode of irradiating the light beam and irradiating the second light beam;
Servo control for irradiating the optical disk with the second light beam is performed. When the second light beam is irradiated in the first mode, the second light beam irradiated onto the optical disk. It performs on the basis of a detection signal corresponding to the case where the second light beam is irradiated in the second mode the first switch so as to perform on the basis of a detection signal corresponding to the first light beam And a recording / reproducing method comprising:

Images