KR20010075072A - Laser diode control in rewritable optical recording devices - Google Patents
Laser diode control in rewritable optical recording devices Download PDFInfo
- Publication number
- KR20010075072A KR20010075072A KR1020017003218A KR20017003218A KR20010075072A KR 20010075072 A KR20010075072 A KR 20010075072A KR 1020017003218 A KR1020017003218 A KR 1020017003218A KR 20017003218 A KR20017003218 A KR 20017003218A KR 20010075072 A KR20010075072 A KR 20010075072A
- Authority
- KR
- South Korea
- Prior art keywords
- laser diode
- recording
- state
- states
- optical recording
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims description 10
- 238000002310 reflectometry Methods 0.000 claims abstract description 5
- 239000012634 fragment Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract 1
- 239000012876 carrier material Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000010186 staining Methods 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1263—Power control during transducing, e.g. by monitoring
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00454—Recording involving phase-change effects
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/006—Overwriting
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
- G11B2220/215—Recordable discs
- G11B2220/216—Rewritable discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
본 발명은, 정보 콘텐트에 따라 기록매체 상에 2개의 서로 다른 상태가 발생되도록 하는, 재기록 가능한 기록매체에 광 기록하는 전자 장치에 관한 것이다. 본 발명에 따르면, 복수의 상태를 기록할 때, 복수의 상태 중에서 단지 한가지 상태의 반사도가 측정되고, 다른 상태를 기록할 때에도 레이저 다이오드의 출력을 제어하기 위한 측정값이 사용된다.The present invention relates to an electronic device for optically recording onto a rewritable record carrier, which allows two different states to occur on the record carrier according to the information content. According to the present invention, when recording a plurality of states, the reflectivity of only one of the plurality of states is measured, and a measurement value for controlling the output of the laser diode is used even when recording the other states.
Description
본 발명은, 정보 콘텐트에 의존하여 기록매체 상에 2개의 서로 다른 상태가 발생되도록 하는, 재기록 가능한 기록매체에 기록하는 광 기록장치에 관한 것이다.The present invention relates to an optical recording apparatus for recording on a rewritable recording medium, in which two different states occur on the recording medium depending on the information content.
광 기록매체에 기록하기 위해서, 스폿에 의해 기록매체 스폿을 가열시키기 위해 레이저 다이오드가 사용된다. 광 기록매체의 물질층이 그것의 용융점을 초과하여 가열되면, 이 층의 물질이 스폿에 의해 용융된 스폿이 될 수 있다. 추가적인 에너지의 공급이 없으면, 이 정보매체 물질은 신속하게 냉각되어, 용융된 상태로부터 비정질 상태로 변한다. 정보매체 물질을 일정한 시간 동안 용융 온도를 아래로, 그러나 이 물질에 고유한 결정화 온도 위로 유지시키는 에너지 공급이 투여되면, 정보매체 물질이 결정 상태로 변한다. 결정 상태와 비정질 상태에서의 정보매체의 반사 특성이 광범위하게 다르기 때문에, 저장된 데이터가 마찬가지로 반사된 빛의 양의 평가에 의해 판독될 수 있다.In order to record on the optical record carrier, a laser diode is used to heat the record carrier spot by spot. If the material layer of the optical record carrier is heated beyond its melting point, the material of this layer may become a spot melted by the spot. In the absence of an additional supply of energy, this information carrier material cools rapidly and changes from a molten state to an amorphous state. When an energy supply is administered that keeps the information carrier material below the melting temperature for a period of time, but above the crystallization temperature inherent to the material, the information carrier material changes to a crystalline state. Since the reflective properties of the information carriers in the crystalline state and the amorphous state are widely different, the stored data can likewise be read by evaluation of the amount of reflected light.
기록동작 동안에 정보층의 위상 상태는 특정한 시간 내에 특정한 영역으로 주어진 에너지에 의해 결정되기 때문에, 예를 들어 광 저장매체의 표면 상의 지문과 먼지 입자와 같은 얼룩이 이 물질에 주어진 에너지를 흡수하므로, 레이저 다이오드에 의해 발생된 출력의 제어가 그 상태로는 충분하지 않다. 레이저 다이오드에 의해 인가된 에너지가 얼룩으로 인해 너무 작으면, 이 스폿에서의 정보매체 층이 결정 상태 대신에 비정질 상태로 전환되는데, 이것은 예상된 효과와는 반대가 된다. 이와 같은 얼룩을 보상하기 위한 에너지가 더 높게 선택되면, 얼룩이 없이 스폿에 인가된 에너지가 너무 높아져 정보매체 물질이 원치 않게 결정 상태로 전환할 수 있다. 이것은, 기록된 정보가 기록하기를 원하는 정보와 일치하게 않게 되는 결과를 발생할 수 있다.Since the phase state of the information layer during a recording operation is determined by the energy given to a particular area within a certain time, for example, fingerprints and dust particles on the surface of the optical storage medium absorb the energy given to this material, so that the laser diode The control of the output generated by is not sufficient for that state. If the energy applied by the laser diode is too small due to staining, the information carrier layer at this spot switches to an amorphous state instead of a crystalline state, which is the opposite of the expected effect. If a higher energy is selected to compensate for this stain, the energy applied to the spot without the stain may be too high, causing the information carrier material to undesirably transition to a crystalline state. This may result in the recorded information not matching the information desired to be recorded.
기록 동작을 제어하기 위해서는, 기록 동작의 교란을 인식하고 그들을 보상하기 위해, 바람직하게는 기록 동작 동안에 기록된 상태가 판독된다.In order to control the recording operation, in order to recognize the disturbance of the recording operation and compensate for them, the state recorded during the recording operation is preferably read.
기록하는데 사용된 빛의 양이 방사된 빛에 있어서의 변환에 의해 제어되는 광 기록장치가 예를 들면 JP 5-292672에 공지되어 있다. 반사된 빔은 샘플 홀드 회로를 사용하여 버퍼링되고, 기준값과 비교된다. 측정된 값과 기준값 사이의 차이는, 기록을 위해 사용된 레이저 다이오드에 의해 방사된 빛의 양을 제어하는데 사용된다.An optical recording apparatus in which the amount of light used for recording is controlled by conversion in emitted light is known, for example, in JP 5-292672. The reflected beam is buffered using a sample hold circuit and compared to a reference value. The difference between the measured value and the reference value is used to control the amount of light emitted by the laser diode used for recording.
결국, 본 발명의 목적은, 재기록 가능한 기록매체에 대해서도 적합하도록, 기록을 위해 사용된 레이저 다이오드의 출력 전력 제어를 제공함에 있다.Finally, it is an object of the present invention to provide control of the output power of a laser diode used for recording, so as to be suitable for a rewritable recording medium.
이와 같은 목적은, 기록 상태 동안에, 복수의 상태 중에서 단지 한가지 상태의 반사도가 측정되고, 이 측정된 값은 다른 상태가 기록될 때에도 레이저 다이오드의 출력을 제어하는데 사용됨으로써 달성된다.This object is achieved by, during the recording state, the reflectivity of only one of the plurality of states is measured and this measured value is used to control the output of the laser diode even when the other state is recorded.
바람직하게는, 고도로 반사하는(= 결정) 상태가 기록될 때, 신호 피크 검출을 사용하여 반사된 빛의 양이 측정되어 기준값과 비교된다. 예를 들어, 저장매체의 표면의 얼룩의 결과로써 편차가 발생한 경우에, 레이저 다이오드의 출력이 이에 따라 재조정된다. 이와 같이 결정된 재조정 인자는 또한 저방사(= 비정질) 상태를 기록하기 위해 유지된다. 이때, 본 발명은, 기록동작에 영향을 미치는 얼룩이 큰 표면을 덮는다고 가정한다. 그 결과, 저반사 상태 동안의 기록을 위한 개별적인 재조정이 필요하지 않다. 채널 코딩은, 각각의 상태가 어쨌든 제한된 회수동안 반복되도록 한다. 이에 따라, 고도로 반사하는 상태가 너무 멀리 떨어지지 않고, 기록하고자 하는 고도로 반사하는 상태 사이의 거리가 일반적으로 얼룩의 양보다 작아지게 된다.Preferably, when a highly reflective (= determined) state is recorded, the amount of reflected light is measured and compared with a reference value using signal peak detection. For example, in the event that a deviation occurs as a result of staining of the surface of the storage medium, the output of the laser diode is readjusted accordingly. The readjustment factor thus determined is also maintained to record the low spinning (= amorphous) state. At this time, the present invention assumes that unevenness affecting the recording operation covers a large surface. As a result, no individual readjustment is required for recording during low reflection conditions. Channel coding allows each state to be repeated for a limited number of times anyway. Thus, the highly reflective state is not too far apart, and the distance between the highly reflective states to be recorded is generally smaller than the amount of spots.
바람직하게는, 이미 고도로 반사하는 상태에 있는 단편이 고도로 반사하는 상태로 오버라이트되는 지점에서 반사도가 측정된다.Preferably, the reflectivity is measured at the point where the fragment already in the highly reflective state is overwritten to the highly reflective state.
이하, 본 발명을 첨부도면에 도시된 실시예에 근거하여 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings.
실시예는 광 기록매체(3) 상의 레이저 다이오드(2)의 기록 동작을 제어하기 위한 본 발명에 따른 제어회로(1)를 구비한 광 기록장치를 나타낸다. 예를 들어, CD-RW와 같은 광 기록매체(3)는 개략적으로 도시된 모터(4)에 의해 구동된다. 제어회로(5) 내부에서는, 특정한 기록 전략을 달성하기 위해 필요한 레이저 다이오드(2)의 각각의 레이저 출력이 결정되고, 제어회로(1)의 목표값 Px로서 사전에 정의된다. 포토다이오드(미도시)를 사용하여, 그것이 기록되는 동일한 위치에서 저장매체가 판독된다. 판독신호는 피크값 검출기(6)로 인가되어 판독신호 M을발생한다. 이와 같은 판독신호는 기준신호 Mref와 비교되고, 차이신호가 제어망(13)을 통해 승산단(11)의 입력으로 인가된다. 제어회로(1)의 시간 의존적인 제어 거동은 제어망(13)에 의해 결정된다.The embodiment shows an optical recording apparatus having a control circuit 1 according to the present invention for controlling the writing operation of the laser diode 2 on the optical recording medium 3. For example, an optical record carrier 3 such as a CD-RW is driven by a motor 4 schematically shown. Inside the control circuit 5, the laser output of each of the laser diodes 2 necessary to achieve a specific recording strategy is determined and defined in advance as the target value Px of the control circuit 1. Using a photodiode (not shown), the storage medium is read at the same location where it is recorded. The read signal is applied to the peak value detector 6 to generate a read signal M. This read signal is compared with the reference signal Mref, and the difference signal is applied to the input of the multiplication stage 11 through the control network 13. The time dependent control behavior of the control circuit 1 is determined by the control network 13.
승산단(11)의 또 다른 입력에는 공칭 전력 Px가 공급된다, 승산단(11)의 출력은 가산회로(12)의 제 1 입력으로 인가된다. 레이저 다이오드의 동작점을 설정하기 위해, 가산회로(12)의 또 다른 입력에는 오프셋 전압이 공급된다. 반사된 빛의 양이 변하면, 제어회로의 이득 인자가 이에 따라 조정됨으로써, 한개 또는 다른 상태가 기록될 때, 기록매체(3) 상에 가능한 한 일정한 전력을 공급하게 된다.Another input of the multiplication stage 11 is supplied with a nominal power Px, and the output of the multiplication stage 11 is applied to the first input of the addition circuit 12. In order to set the operating point of the laser diode, another input of the addition circuit 12 is supplied with an offset voltage. If the amount of reflected light changes, the gain factor of the control circuit is adjusted accordingly, so that when one or another state is recorded, it supplies as constant power as possible on the recording medium 3.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19932658.4 | 1999-07-15 | ||
| DE19932658A DE19932658A1 (en) | 1999-07-15 | 1999-07-15 | Laser diode control in rewritable optical recording devices |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20010075072A true KR20010075072A (en) | 2001-08-09 |
| KR100752637B1 KR100752637B1 (en) | 2007-08-29 |
Family
ID=7914580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020017003218A KR100752637B1 (en) | 1999-07-15 | 2000-07-10 | Electronic optical recording device |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP1114416A1 (en) |
| JP (1) | JP2003505807A (en) |
| KR (1) | KR100752637B1 (en) |
| CN (1) | CN1154094C (en) |
| AU (1) | AU5984000A (en) |
| CA (1) | CA2344069A1 (en) |
| DE (1) | DE19932658A1 (en) |
| HU (1) | HUP0103926A3 (en) |
| PL (1) | PL346652A1 (en) |
| WO (1) | WO2001006499A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05282672A (en) | 1990-05-18 | 1993-10-29 | Taiyo Yuden Co Ltd | Optical information recording device |
| GB9026774D0 (en) | 1990-12-10 | 1991-01-30 | Plasmon Data Systems Inc | Improving optical disk recording performance |
| US5184343A (en) | 1991-05-06 | 1993-02-02 | Johann Donald F | Compensation for dust on an optical disk by increasing laser writing power |
| JPH1040548A (en) * | 1996-07-26 | 1998-02-13 | Taiyo Yuden Co Ltd | Running opc method for optical disk and optical disk recording/reproducing apparatus |
| IL126369A (en) * | 1997-01-29 | 2002-11-10 | Koninkl Philips Electronics Nv | Method and device for recording and/or reproducing information |
-
1999
- 1999-07-15 DE DE19932658A patent/DE19932658A1/en not_active Withdrawn
-
2000
- 2000-07-10 WO PCT/EP2000/006548 patent/WO2001006499A1/en active Application Filing
- 2000-07-10 KR KR1020017003218A patent/KR100752637B1/en not_active IP Right Cessation
- 2000-07-10 PL PL00346652A patent/PL346652A1/en not_active Application Discontinuation
- 2000-07-10 CA CA002344069A patent/CA2344069A1/en not_active Abandoned
- 2000-07-10 AU AU59840/00A patent/AU5984000A/en not_active Abandoned
- 2000-07-10 CN CNB008014035A patent/CN1154094C/en not_active Expired - Fee Related
- 2000-07-10 HU HU0103926A patent/HUP0103926A3/en unknown
- 2000-07-10 EP EP00945904A patent/EP1114416A1/en not_active Ceased
- 2000-07-10 JP JP2001511674A patent/JP2003505807A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| HUP0103926A2 (en) | 2002-03-28 |
| PL346652A1 (en) | 2002-02-25 |
| KR100752637B1 (en) | 2007-08-29 |
| CA2344069A1 (en) | 2001-01-25 |
| HUP0103926A3 (en) | 2004-01-28 |
| CN1318193A (en) | 2001-10-17 |
| EP1114416A1 (en) | 2001-07-11 |
| AU5984000A (en) | 2001-02-05 |
| WO2001006499A1 (en) | 2001-01-25 |
| DE19932658A1 (en) | 2001-01-18 |
| CN1154094C (en) | 2004-06-16 |
| JP2003505807A (en) | 2003-02-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR910000332B1 (en) | Recording method of optical information | |
| EP0106673B1 (en) | Optical and reversible recording and reproducing apparatus | |
| US6445670B1 (en) | Laser power control device, optical head and optical recording and/or reproducing apparatus | |
| EP0559391B1 (en) | Magnetooptical recording/reproducing method and apparatus | |
| CA1206612A (en) | Direct read after write optical disk system | |
| KR100218070B1 (en) | Method of and device for writing and reading optical data by using phase transition optical | |
| KR19980081210A (en) | Power control method of laser light, data recording method of optical disc and optical disc recording apparatus | |
| US5136572A (en) | Optical data storage using temperature stabilizer lasers | |
| JPH07276698A (en) | Image recording apparatus | |
| EP0713214B1 (en) | A method and an apparatus for controlling the power of a multibeam semiconductor laser device | |
| US4967417A (en) | Laser driving device provided with two reference signal sources, and optical information recording apparatus using the same device | |
| KR100752637B1 (en) | Electronic optical recording device | |
| US5726961A (en) | Optical pickup control system for optical discs having different reflectivities | |
| EP0516328B1 (en) | Optical pick-up device | |
| US7272103B2 (en) | Laser power monitor device, optical pickup including the same, and optical recording and/or reproducing apparatus including the same | |
| KR960007231B1 (en) | Optical disk apparatus | |
| JP2000076653A (en) | Information recorder | |
| MXPA01002744A (en) | Laser diode control in rewritable optical recording devices | |
| KR20050042785A (en) | Method and apparatus for recording marks in a phase-change type information layer of a record carrier | |
| JPS61287055A (en) | Optical recording and reproducing device | |
| EP0420250A2 (en) | Optical disc apparatus | |
| RU2014648C1 (en) | Device for recording of information on optical carrier | |
| JPH04302831A (en) | High frequency driving device for laser diode | |
| JPH01296439A (en) | Semiconductor laser control circuit | |
| JPH05342623A (en) | Optical information recording device and optical information recording medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E701 | Decision to grant or registration of patent right | ||
| GRNT | Written decision to grant | ||
| G170 | Re-publication after modification of scope of protection [patent] | ||
| LAPS | Lapse due to unpaid annual fee |