CN101174432B - Burning policy control method and information burning device - Google Patents
Burning policy control method and information burning device Download PDFInfo
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- CN101174432B CN101174432B CN2006102010465A CN200610201046A CN101174432B CN 101174432 B CN101174432 B CN 101174432B CN 2006102010465 A CN2006102010465 A CN 2006102010465A CN 200610201046 A CN200610201046 A CN 200610201046A CN 101174432 B CN101174432 B CN 101174432B
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Abstract
The invention relates to a recording strategy control method, which comprises the following steps: on-line detection is performed in the process of recording an optical disk; whether an error occurs or the preset check point is achieved is determined; if an error occurs or the preset check point is achieved, the recording is suspended, and off-line detection is performed; whether recorded data error rate exceeds the predetermined value is determined; if the recorded data error rate exceeds the predetermined value, the recording speed is reduced; the recording strategy is adjusted according to the off-line detection result and the reduced recording speed. The recording strategy control method makes detection on the recording quality in the actual recording process, performs adaptive adjustment to the recording strategy according to the detection result, ensures the recording strategy to adapt to the quality and the operating environment of the optical disk, and improves the recording quality. In addition, the invention also provides an information recording device using the recording strategy control method.
Description
Technical field
The present invention relates to a kind of information burning device, relate in particular to a kind of burning policy control method of information burning device.
Background technology
In the last few years, but imprinting type CD information burning media such as (DVD-R/RW, DVD+R/RW or CD-R/RW) reaches characteristics such as portability greatly and obtains more and more widely use as the carrier of imprinting information owing to its memory capacity.Be used for imprinting information to the information burning device of recordable media, owing to providing the autonomous imprinting information of user to be subjected to user's welcome.Corresponding information burning technology has also obtained development rapidly.Usually, information burning device adopts optical read head (optical pick-upunit, OPU) give off laser beam and assemble to the information burning medium, when the laser recording power of output reaches set-point and is correctly focused on the imprinting layer of CD, information by imprinting on the information burning medium.
Recording power is one of imprinting parameter that influences the CD burning quality.Different recording powers can produce different influences to the optical disc information recording layer, thereby reads effect after influencing CD burning and finishing, even may cause the data of imprinting to read and CD is scrapped.Except recording power, the imprinting parameter that influences the CD burning quality also comprises the inclination angle of optical read head relative CD when imprinting, the focal position of laser beam in CD etc.Usually, with burning policy these imprinting parameters are described.
In order in actual imprinting information process, to keep best imprinting quality, before carrying out actual imprinting information process, all can make the burning policy that adapts to this CD in advance.For example, before carrying out actual engraving data process, can carry out a best power usually and proofread and correct (optimal power calibration, OPC) process.When carrying out the OPC process, optical read head sends the laser beam with different capacity value, will proofread and correct information burning in the capability correction zone of CD (power calibrationarea, PCA), select optimum power value this different capacity value according to the folded light beam of returning from CD reflection then.According in above-mentioned PCA, carrying out the optimum power value that OPC operation back obtains, calculate trying to achieve in other zones of CD recording power required when adopting different imprinting multiple.
Yet, in actual imprinting process, if only adopt predetermined burning policy, and heavily burning policy is not made adaptations in the imprinting process, then be subjected to the influence of quality of CD own and environment for use, can be different as the fingerprint on the dye layer thickness of CD zones of different, CD inclination angle, the CD etc., make the imprinting quality can not keep best, even may cause the imprinting failure and CD is scrapped.
Summary of the invention
In view of this, be necessary to provide a kind of control method of in the imprinting process, burning policy being carried out accommodation.
In addition, also be necessary to provide a kind of information burning device that in the imprinting process, burning policy is carried out accommodation.
A kind of burning policy control method comprises the steps: to carry out online detection in the process of imprinting CDs; Judge whether wrong generation or arrive default checkpoint; If wrong generation or arrive described default checkpoint then suspends imprinting, carry out offline inspection; Whether the data error rate of judging imprinting surpasses predetermined value; If described data error rate surpasses described predetermined value, then reduce etch-recording speed; Adjust burning policy according to the result of described offline inspection and the etch-recording speed after the reduction.
A kind of information burning device, comprise online detection module, offline inspection module and burning policy control module, described online detection module comprises position detection unit and error detection unit, described position detection unit is used for carrying out online testing process at described online detection module and judges whether to arrive default checkpoint, and described error detection unit is used for having judged whether that in described online testing process the imprinting mistake takes place; Described offline inspection module is used for carrying out offline inspection when the imprinting mistake takes place or arrive described default checkpoint, to determine the etching/recording quality of CD, described offline inspection module comprises the error rate detecting unit, and described error rate detecting unit is used for the data error rate is detected; Described burning policy control module comprises speed control unit, if described data error rate surpasses predetermined value, then described speed control unit reduces etch-recording speed, the etch-recording speed adjustment burning policy of described burning policy control module according to described offline inspection result and after reducing.
Above-mentioned burning policy control method and information burning device, in actual imprinting process, the imprinting quality is detected, according to testing result burning policy is carried out accommodation, make burning policy adapt to quality of CD own and environment for use, improved etching/recording quality.
Description of drawings
Fig. 1 is the block scheme of a better embodiment information burning device;
Fig. 2 is the block scheme of more detailed information burning device, and this information burning device comprises an optical read head;
Fig. 3 is the inner index path of optical read head among Fig. 2;
Fig. 4 is the burning policy control method process flow diagram of a better embodiment;
Fig. 5 adopts the beta curve figure of predetermined burning policy during for imprinting;
Fig. 6 adopts the beta curve figure that in the imprinting process burning policy is carried out accommodation during for imprinting;
Fig. 7 adopts the imprinting error curve figure of predetermined burning policy during for imprinting;
Fig. 8 adopts the imprinting error curve figure that in the imprinting process burning policy is carried out accommodation during for imprinting;
Fig. 9 adopts the radiofrequency signal shake spirogram of predetermined burning policy during for imprinting;
Figure 10 adopts the radiofrequency signal shake spirogram that in the imprinting process burning policy is carried out accommodation during for imprinting.
Embodiment
As shown in Figure 1, information burning device 1 is used for imprinting information to CD 30, it comprises optical read head (opticalpick-up unit, OPU) 10, analogue signal processor (analog signal processor, ASP) 12, digital signal processor (digital signal processor, DSP) 14, firmware 16, driver 18 and motor 20.
Online detection module 160 is used for the signal after digital signal processor 14 processing is carried out online detection, and whether judge has the generation of imprinting mistake or do not arrived the checkpoint, do not stop the imprinting to CD 30 in the online testing process in the imprinting process.Information burning device 1 predetermined several checkpoints, the checkpoint is divided into several zones with CD 30.After having detected the checkpoint, promptly represent the intact a certain zone of imprinting after, information burning device 1 suspends imprinting, carries out offline inspection by 180 pairs of these zones of the offline inspection module in the firmware 16.In addition, if online detection module 160 detects the wrong generation of imprinting process, it is excessive for example to seek rail error signal, focus error signal or vibration signal, and then information burning device 1 same time-out imprinting is carried out offline inspection by the offline inspection module in the firmware 16 180.
Offline inspection module 180 is used for behind the signal after receiving digital signals processor 14 is handled and according to this signal the part of imprinting being carried out offline inspection, with the etching/recording quality of the data of determining imprinting.For example, error rate of data etc. is detected, testing result is sent to burning policy control module 190.
Burning policy control module 190 is used for the testing result according to offline inspection module 180, the burning policy of adjustment information Writing device 1.For example, adjust the laser beam power that optical read head 10 sends by digital signal processor 14 and analogue signal processor 12, or adjust the inclination angle or the depth of focus of laser beam by driver 18, again or the rotating speed of adjusting motors 20 by driver 18 to adjust etch-recording speed etc.
As shown in Figure 2, it is the block scheme of more detailed information burning device 1.Optical read head 10 comprise laser diode (laser diode, LD) 100, photodiode (photo diode, PD) 102, preposition monitor diode (frontmonitor diode, FMD) 104, inclination angle actuator 106 and focus actuator 108.
Please in the lump referring to Fig. 3, it is the inside light path synoptic diagram of optical read head 10.LD 100 sends incident beam 110, and this incident beam 110 is assembled to CD 30 through spectroscope 112 and object lens 114, with imprinting information to CD 30 or reproduce canned data on the CD 30.This incident beam 110 of CD 30 reflections produces folded light beam 116, and this folded light beam 116 exposes on the PD 102 behind object lens 114 and spectroscope 112.PD 102 detects this folded light beam 116 and is converted into electric signal.PD 102 can be four-quadrant, or eight quadrants.With four-quadrant PD is example, and the electric signal that PD 102 produces comprises A, B, C, four groups of signals of D.Control signal when these four groups of signals are used as information burning device 1 running.
FMD 104 is used to monitor the power of the incident beam 110 that LD 100 sends and produces the FMD signal in view of the above and is sent to analogue signal processor 12.Analogue signal processor 12 is adjusted incident beam 110 power that LD 100 produces according to this FMD signal.Inclination angle actuator 106 and focus actuator 108 are respectively applied for the inclination angle and the depth of focus on CD 30 thereof of adjusting incident beam 110.
Servo circuit 120 produces servosignal after being used to receive the electric signal that PD 102 produces, and then (analog-to-digital, A/D) converter 142 to transmit the analog/digital of this servosignal to the digital signal processor 14.Different servosignal production method differences, for example: A, two groups of signals of B with value deduct C, D two groups of signals with difference value as the inclination angle control signal, and revise the inclination angle of incident beam 110 with respect to CD 30 according to this inclination angle control signal.With A, two groups of signals of C with value deduct B, D two groups of signals with difference value as focus control signal, and revise incident beam 110 according to this focus control signal and focus on site error on the CD 30.
A/D converter 142 links to each other with servo circuit 120, is used for that servosignal is converted to first digital signal and is sent to error detection unit 164 in the online detection module 160.Error detection unit 164 is used for detecting according to this first digital signal whether seek rail error signal, focus error signal or vibration signal excessive, if above-mentioned signal is excessive, promptly represent the wrong generation of imprinting process, then information burning device 1 suspends imprinting, carries out offline inspection by the offline inspection module in the firmware 16 180.
Error detection unit 164 comprises seeks rail error detector 168, focus error detection device 170 and vibration detector 172.Seek rail error detector 168 and be used for detecting and seek the rail error signal, judge whether seek the rail error signal excessive.If it is excessive to seek the rail error signal, then information burning device 1 stops imprinting and carries out offline inspection.Similarly, focus error detection device 170 and vibration detector 172 are respectively applied for detection of focus error signal and vibration signal, judge whether focus error signal and vibration signal be excessive.If focus error signal or vibration signal are excessive, then information burning device 1 stops imprinting and carries out offline inspection.If it is not excessive to seek rail error signal, focus error signal and vibration signal, then proceed imprinting, after having detected the checkpoint, just carry out offline inspection.
RF circuit 122 produces the RF signal after being used to receive the electric signal that PD 102 produces, and the RF signal is sent to address decoder 140, A/D converter 142 and data decoder 144 in the digital signal processor 14.The RF signal is above-mentioned A, B, C, four groups of signals of D and the value.
Address decoder 140 links to each other with RF circuit 122, goes out address signal according to the RF signal resolution after being used to receive the RF signal, and address signal is sent to position detection unit 162 in the online detection module 160 in the firmware 16.After position detection unit 162 had detected the checkpoint according to this address signal, information burning device 1 suspended imprinting, carries out offline inspection by 180 pairs of these zones of the offline inspection module in the firmware 16.
If online detection module 160 detects the wrong generation of imprinting process or has detected the checkpoint, behind the signal after then offline inspection module 180 receiving digital signals processors 14 are handled, according to the signal after digital signal processor 14 processing part of imprinting is carried out offline inspection, the result according to offline inspection adjusts burning policies by burning policy control module 190 again.
Data decoder 144 in the digital signal processor 14 link to each other with RF circuit 122, are used to receive decode engraving data behind the RF signal and this engraving data is sent to the interior error rate detecting unit 182 of offline inspection module 180.Error rate detecting unit 182 is used for detecting according to this engraving data the error rate (Block Error Rate) of data.For example, adopt PIPO error correction system (" Parity Inner (parity checking ISN) " and " Parity Outer (the outer sign indicating number of parity checking) ") in the dvd system usually.When the data of coming out when decoding have PIE (Parity Inner Error, ISN parity error) or POE (Parity Outer Error, outer sign indicating number parity error), the mistake that expression can be revised.When the data of coming out when decoding have PIF (Parity Inner Fail, ISN parity checking failure) or POF (Parity Outer Fail, outer sign indicating number parity checking failure), the mistake that expression can't be revised.The quantity that PIE or POE occur is many more, represents that promptly error rate is big more.And after PIE/POE numerical value arrives a certain degree greatly, just have PIF/POF and produce.Error rate detecting unit 182 is sent to speed control unit 192 in the burning policy control module 190 with the error rate of data.
Speed control unit 192 is used for adjusting etch-recording speed according to the data error rate that error rate detecting unit 182 detects.Speed control unit 192 links to each other with driver 18, when the error rate of data surpasses predetermined value, speed control unit 192 send rate control instruction to driver 18 to adjust etch-recording speed.For example, send the instruction that reduces etch-recording speed, driver 18 reduces the instruction of etch-recording speed according to this, adjusts the rotating speed of motor 20, thereby adjusts etch-recording speed.
A/D converter 142 receives the RF signal that RF circuit 122 produce, and the RF conversion of signals is become after second digital signal β detecting unit 184 that this second digital signal is sent in the offline inspection module 180.β detecting unit 184 calculates the value of β according to this second digital signal.Wherein β is a kind of symmetry parameter, and whether be used for estimating a certain certain power value is optimum power value.The waveform of RF signal comprises a high amplitude A1 and a short arc A2.β is the symmetry parameter of RF signal waveform, and it satisfies formula: β=(A1-A2)/(A1+A2).The best value of different CDs may be inequality, and the equal imprinting of best value of each CD is in CD.The corresponding power of best β value is best power.
Power control unit 194 in the burning policy control module 190 is adjusted recording power according to the β value that β detecting unit 184 detects.Digital-to-analog mould (digital-to-analog in power control unit 194 and the digital signal processor 14, D/A) converter 146 links to each other, come transmitting power control signal to D/A converter 146 according to the testing result of β detecting unit 184, be sent to APC circuit 124 after converting simulating signal to by D/A converter 146.APC circuit 124 is controlled LD100 emitted laser power according to this simulating signal.Usually, the relative best of β value of detection is worth when bigger than normal, reduces the power of imprinting laser; Otherwise the relative best of β value of detection is worth when less than normal, increases the power of imprinting laser.
Shake detecting units 186 in the offline inspection module 180 are used to receive the data that data decoder 144 decodes and detect shake (Jitter) value.Shake detecting unit 186 is sent to servo control unit 196 in the burning policy control module 190 with the jitter value that detects.Servo control unit 196 is adjusted the inclination angle and the depth of focus of light beam according to jitter value.Servo control unit 196 links to each other with driver 18, if jitter value is bigger than normal, then servo control unit 196 sends servo adjustment signal to driver 18.Driver 18 is sent to inclination angle actuator 106 or the focus actuator 108 that links to each other with driver 18 according to should servo adjustment signal producing drive signal, and inclination angle actuator 106 or focus actuator 108 are respectively according to the inclination angle and the depth of focus of the drive signal control bundle of driver 18 generations.Can adopt multiple mode adjustment to come the inclination angle and the focusing of light beam, for example, adjust the depth of focus of laser beam gradually, and detect jitter value in real time, when jitter value reaches minimum value, can be set at optimal focus depth.
Above-mentioned information burning device 1 carries out online detection by 160 pairs of imprintings of online detection module in actual imprinting process, start offline inspection according to online testing result.Partly carry out offline inspection by 180 pairs of imprintings of offline inspection module, burning policy is carried out accommodation, make burning policy adapt to CD 30 quality own and environments for use, improved etching/recording quality according to the offline inspection result.
It is as follows in the imprinting process burning policy to be carried out the control procedure of accommodation: carry out online detection in the journey of imprinting CDs; In the online testing process, judge whether wrong generation or arrive default checkpoint; If imprinting is then suspended in wrong generation or the default checkpoint of arrival, carry out offline inspection; In the offline inspection process, judge whether the data error rate of imprinting surpasses predetermined value; If data error rate surpasses predetermined value, then reduce etch-recording speed; Adjust burning policy according to the result of offline inspection and the etch-recording speed after the reduction.
Please referring to Fig. 4, it is for carrying out the control method process flow diagram of accommodation to burning policy in the imprinting process.
At first, after flow process begins, step 402, information burning device 1 is set initial burning policy.The setting of initial burning policy can be adopted multiple mode, for example the acquiescence burning policy of storage in the information burning device 1, the burning policy of selecting according to the media recognition sign indicating number (Media ID) of CD 30, (power calibration area PCA) tries imprinting with the burning policy of determining CD 30 etc. in the capability correction zone of CD 30.
Whether step 408 for judging in the online testing process wrong generation or arrival checkpoint.If it is excessive to seek rail error signal, focus error signal or vibration signal, then represent wrong generation, information burning device 1 suspends imprinting (step 410).When if information burning device 1 is burnt to default checkpoint, suspend imprinting (step 410) equally.If both do not had wrong the generation not arrive the checkpoint yet, and then returned step 306 and proceed imprinting.
After suspending imprinting (step 410), the data of 1 pair of imprinting of information burning device are carried out offline inspection (step 412).Offline inspection comprises the detection of the detection of β value, data error rate and the detection of jitter value.
Step 320 finishes for judging whether imprinting.If the imprinting process finishes, for example data carving finishes, and then flow process finishes.If imprinting does not finish, then return step 404, start imprinting to imprint CDs 30 according to adjusted burning policy, the starting point of imprinting is the breakpoint of carrying out offline inspection last time.
Above-mentioned burning policy control method detects the imprinting quality in actual imprinting process, according to testing result burning policy is carried out accommodation, makes burning policy adapt to CD 30 quality own and environments for use, has improved etching/recording quality.
As Fig. 5 and shown in Figure 6, adopt predetermined burning policy when being respectively imprinting and adopt the beta curve figure that in the imprinting process burning policy is carried out accommodation.The physical sector number at horizontal ordinate representative information imprinting point place, physical sector number is big more, and the position at expression information burning point place is far away more from the center of CD 30.Ordinate is represented the value of β, and wherein lines 80 are represented the best value.If good more to recording power control usually, the fluctuating range of the relative optimum power value of β is more little, and information burning is stable more.Clearly, it is medium and small that β value fluctuating range is compared Fig. 5 among Fig. 6, and therefore information burning device 1 and the burning policy control method that in the imprinting process burning policy is carried out accommodation adopted in explanation, reduced the amplitude of β value fluctuation, improved imprinting stability.
As Fig. 7 and shown in Figure 8, adopt predetermined burning policy when being respectively imprinting and adopt imprinting mistake (parity inner error, the PIE) curve map that in the imprinting process burning policy is carried out accommodation.PIE is the error in data quantity that occurs in the imprinting process, and the few more expression data of mistake are correct more usually.The physical sector number at horizontal ordinate representative information imprinting point place, ordinate is represented the value of PIE.Clearly, to compare Fig. 7 medium and small a lot of for the value of PIE among Fig. 8, and therefore explanation has adopted in the imprinting process information burning device 1 and burning policy control method that burning policy is carried out accommodation can improve the information burning correctness.
As Fig. 9 and shown in Figure 10, adopt predetermined burning policy when being respectively imprinting and adopt radiofrequency signal amount of jitter (Jitter) figure that in the imprinting process burning policy is carried out accommodation.Horizontal ordinate is represented the time, the frequency that the ordinate representative occurs.Usually Jitter is concentrated more, represents amount of jitter more little, and the quality of imprinting is also good more.As can be seen, the Jitter figure of Figure 10 is comparatively concentrated, and can obviously distinguish the difference of different length; And the Jitter figure of Fig. 9 comparatively disperses, and the difference of the different length that is not easily distinguishable out.
Claims (14)
1. a burning policy control method comprises the steps:
In the process of imprinting CDs, carry out online detection;
Judge whether wrong generation or arrive default checkpoint;
If wrong generation or arrive described default checkpoint then suspends imprinting, carry out offline inspection;
Whether the data error rate of judging imprinting surpasses predetermined value;
If described data error rate surpasses described predetermined value, then reduce etch-recording speed;
Adjust burning policy according to the result of described offline inspection and the etch-recording speed after the reduction.
2. burning policy control method as claimed in claim 1 is characterized in that: described online detection comprises and detecting seeking the rail error signal, if describedly seek that the rail error signal is excessive then represents wrong generation.
3. burning policy control method as claimed in claim 1 is characterized in that: described online detection comprises focus error signal detected, and then represents wrong generation if described focus error signal is excessive.
4. burning policy control method as claimed in claim 1 is characterized in that: described online detection comprises vibration signal detected, and then represents wrong generation if described vibration signal is excessive.
5. burning policy control method as claimed in claim 1 is characterized in that: described offline inspection comprises the detection to the β value, if the relative best of described β value is worth when bigger than normal, then reduces the power of the imprinting laser of described burning policy; If the described relatively best of described β value is worth when less than normal, then increase the power of the imprinting laser of described burning policy.
6. burning policy control method as claimed in claim 1 is characterized in that: described offline inspection comprises the detection to jitter value, if described jitter value is bigger than normal, then adjusts the inclination angle and the depth of focus of the light beam of described burning policy.
7. burning policy control method as claimed in claim 1 is characterized in that: also comprise and set the step that starts imprinting behind the initial burning policy.
8. burning policy control method as claimed in claim 1 is characterized in that: also comprise the step of imprinting CDs according to described adjusted burning policy.
9. information burning device, comprise online detection module, offline inspection module and burning policy control module, described online detection module comprises position detection unit and error detection unit, described position detection unit is used for carrying out online testing process at described online detection module and judges whether to arrive default checkpoint, and described error detection unit is used for having judged whether that in described online testing process the imprinting mistake takes place; Described offline inspection module is used for carrying out offline inspection when the imprinting mistake takes place or arrive described default checkpoint, to determine the etching/recording quality of CD, described offline inspection module comprises the error rate detecting unit, and described error rate detecting unit is used for the data error rate is detected; Described burning policy control module comprises speed control unit, if described data error rate surpasses predetermined value, then described speed control unit reduces etch-recording speed, the etch-recording speed adjustment burning policy of described burning policy control module according to described offline inspection result and after reducing.
10. information burning device as claimed in claim 9, it is characterized in that: described online detection module comprises seeks the rail error detector, the described rail error detector of seeking is used for detecting seeking the rail error signal, if describedly seek that the rail error signal is excessive then represents wrong generation.
11. information burning device as claimed in claim 9, it is characterized in that: described online detection module comprises focus error detection device, described focus error detection device is used for focus error signal is detected, and then represents wrong generation if described focus error signal is excessive.
12. information burning device as claimed in claim 9 is characterized in that: described online detection module comprises vibration detector, and described vibration detector is used for vibration signal is detected, and then represents wrong generation if described vibration signal is excessive.
13. information burning device as claimed in claim 9, it is characterized in that: described offline inspection module comprises the β detecting unit, described burning policy control module comprises power control unit, described β detecting unit is used for the β value is detected, if the relative best of described β value is worth when bigger than normal, then described power control unit control reduces the power of imprinting laser; If the described relatively best of described β value is worth when less than normal, the power of then described power control unit control increase imprinting laser.
14. information burning device as claimed in claim 9, it is characterized in that: described offline inspection module comprises the shake detecting unit, described burning policy control module comprises servo control unit, described shake detecting unit is used for jitter value is detected, if described jitter value is bigger than normal, the inclination angle and the depth of focus of light beam adjusted in then described servo control unit control.
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| CN2006102010465A CN101174432B (en) | 2006-10-30 | 2006-10-30 | Burning policy control method and information burning device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1452171A (en) * | 2002-04-17 | 2003-10-29 | 三星电子株式会社 | Device and method for changing recording speed on optical recording medium during recording operating |
| CN1604220A (en) * | 2003-10-03 | 2005-04-06 | 三菱电机株式会社 | Disk reproducing device |
| CN1636245A (en) * | 2001-11-22 | 2005-07-06 | 皇家飞利浦电子股份有限公司 | Recording apparatus and method of recording data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1636245A (en) * | 2001-11-22 | 2005-07-06 | 皇家飞利浦电子股份有限公司 | Recording apparatus and method of recording data |
| CN1452171A (en) * | 2002-04-17 | 2003-10-29 | 三星电子株式会社 | Device and method for changing recording speed on optical recording medium during recording operating |
| CN1604220A (en) * | 2003-10-03 | 2005-04-06 | 三菱电机株式会社 | Disk reproducing device |
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