KR20000032938A - Method and apparatus for recording data of magneto-optical disk - Google Patents
Method and apparatus for recording data of magneto-optical disk Download PDFInfo
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- KR20000032938A KR20000032938A KR1019980049575A KR19980049575A KR20000032938A KR 20000032938 A KR20000032938 A KR 20000032938A KR 1019980049575 A KR1019980049575 A KR 1019980049575A KR 19980049575 A KR19980049575 A KR 19980049575A KR 20000032938 A KR20000032938 A KR 20000032938A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 230000001678 irradiating effect Effects 0.000 claims description 6
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000005381 magnetic domain Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10504—Recording
- G11B11/1051—Recording by modulating both the magnetic field and the light beam at the transducers
- G11B11/10513—Recording by modulating both the magnetic field and the light beam at the transducers one of the light beam or the magnetic field being modulated by data and the other by a clock or frequency generator
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10532—Heads
- G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
- G11B11/10536—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording using thermic beams, e.g. lasers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
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- 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
- G11B7/1267—Power calibration
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- Optics & Photonics (AREA)
- Optical Head (AREA)
Abstract
Description
본 발명은 광자기디스크의 데이터 기록방법 및 장치에 관한 것으로, 특히 데이터 기록시의 레이저 파워 제어방법 및 장치에 관한 것이다.The present invention relates to a data recording method and apparatus for an magneto-optical disk, and more particularly, to a laser power control method and apparatus for data recording.
최근, 기존의 광기록매체에 비하여 월등한 기록용량을 가질 수 있는 광자기기록매체인 ASMO(Advanced Storage Magneto Optical)가 개발되고 있다. 이러한 광자기기록매체는 자기헤드를 이용하여 자계변조를 이용한 기록방식으로 정보를 기록하게 되고, 정보 재생시에는 광-자계 변환특성에 따른 편광각의 변화를 광전소자를 이용하여 정보를 검출하는 방식을 채택하고 있다. 이와 같은 광자기기록매체는 향후 6GB 내지 14GB까지 대용량화될 전망이다.Recently, ASMO (Advanced Storage Magneto Optical), which is an optical magnetic recording medium capable of having an excellent recording capacity compared to an existing optical recording medium, has been developed. Such a magneto-optical recording medium records information by using magnetic field modulation using a magnetic head. When the information is reproduced, a method of detecting information by using an optoelectronic device to change the polarization angle according to the optical-magnetic field conversion characteristics is used. Adopted. Such a magneto-optical recording medium is expected to increase in capacity from 6GB to 14GB in the future.
CD, DVD와 같은 상변화형 광기록매체의 기록방식은 도 1에서와 같이 기록하고자 하는 데이터에 대응하는 직류 옵셋이 포함된 레이저 펄스를 레이저 다이오드(4)에 공급하여 광디스크(2)의 기록막(2a)에 레이저 펄스에 대응하는 광을 조사함으로써 기록막(2a)에 정보 논리값 "1"과 "0"에 각각 대응하는 피트(12) 및 미러(14)를 형성시키게 된다.In a recording method of a phase change type optical recording medium such as a CD or a DVD, a recording film of an optical disc 2 is supplied by supplying a laser pulse including a DC offset corresponding to data to be recorded to the laser diode 4 as shown in FIG. By irradiating light corresponding to the laser pulse on (2a), the pit 12 and the mirror 14 corresponding to the information logic values "1" and "0" are formed in the recording film 2a, respectively.
광자기 기록방식은 크게 상변화형 광기록매체의 기록방식과 유사하게 레이저 펄스에 기록하려는 데이터를 변조하는 방식과 자계에 기록하려는 데이터를 변조하는 방법으로 정보를 기록하고 있다. 전자의 기록방식은 도 2에서와 같이 자기헤드(8)에 소정레벨의 직류전류가 인가되는 기간동안에 데이터에 대응하는 레이저 펄스를 레이저 다이오드(4)에 공급하여 광자기디스크(6)의 기록막(6a)에 레이저 펄스에 대응하는 광을 조사함으로써 기록막(6a)에 피트(22) 및 미러(24)를 형성시키게 된다. 그러나 도 1 및 도 2와 같은 광세기 변조 방식에 의한 기록방식은 기록막(2a,6a)에 집광되는 레이저광빔의 크기가 제한되어 기록시 선밀도를 증가시키기 어려우므로 정보의 대용량화에 제한을 받는 문제점이 지적되고 있다.The magneto-optical recording method records information in a manner of modulating data to be recorded in a laser pulse and a method of modulating data to be recorded in a magnetic field, similarly to a recording method of a phase change type optical recording medium. In the former recording method, as shown in FIG. 2, a laser pulse corresponding to data is supplied to the laser diode 4 during a period in which a predetermined level of DC current is applied to the magnetic head 8, thereby recording the film of the magneto-optical disk 6 The pit 22 and the mirror 24 are formed in the recording film 6a by irradiating light corresponding to the laser pulse on 6a. However, the recording method by the light intensity modulation method as shown in Figs. 1 and 2 is limited in size of the laser light beams focused on the recording films 2a and 6a, so that it is difficult to increase the linear density during recording. This is being pointed out.
후자의 기록방식은 소위 "Laser Pulse-MFM" 방식으로 알려져 있으며 레이저 다이오드(4)에 공급되는 전류 형태에 따라 도 3 및 도 4와 같은 방식이 있다. 도 3을 참조하면, 레이저 다이오드(4)에 소정레벨의 직류전류가 인가되는 기간 동안에 자기헤드(8)에 데이터를 공급하여 기록막(6a)에 피트(32) 및 미러(34)를 형성시키게 된다. 그러나 도 3과 같은 기록방식은 자계의 변조특성의 한계로 인한 기록속도에 제한이 있으므로 기록속도를 향상시키는데 한계가 있다. 또한, 도 3과 같은 기록방식은 자기헤드 구동전류의 포화레벨(Saturation level)이 바뀌는 과도지점에서 비포화자구(31)가 발생되는 문제점이 있다. 이러한 비포화자구(31)는 정보 재생시 지터(jitter) 성분으로서 재생신호에 포함되어 재생에러를 유발하고 재생신호의 신호 대 잡음(S/N)비를 열화시키게 된다.The latter recording method is known as the " Laser Pulse-MFM " method and has a method as shown in Figs. 3 and 4 depending on the type of current supplied to the laser diode 4. Referring to FIG. 3, data is supplied to the magnetic head 8 during a period in which a predetermined level of DC current is applied to the laser diode 4 to form the pit 32 and the mirror 34 in the recording film 6a. do. However, the recording method as shown in FIG. 3 has a limitation in improving the recording speed because the recording speed is limited due to the limitation of the modulation characteristics of the magnetic field. In addition, the recording method as shown in FIG. 3 has a problem in that the desaturated magnetic domain 31 is generated at a transition point where the saturation level of the magnetic head driving current changes. The non-saturated sphere 31 is included in the reproduction signal as a jitter component during information reproduction, causing reproduction errors and degrading the signal-to-noise (S / N) ratio of the reproduction signal.
선밀도를 향상시키고 비포화자구(31)의 발생을 최소화하기 위하여, 도 4와 같은 기록방식이 광자기기록매체의 기록방식으로 채택되고 있다. 도 4를 참조하면, 자기헤드(8)에 공급되는 데이터의 포화레벨 이상에서만 레이저 다이오드(4)에 레이저펄스를 인가함으로써 비포화자구 없이 기록막(6a)에 피트(42) 및 미러(44)를 형성시킬 수 있게 된다.In order to improve the linear density and minimize the occurrence of the unsaturated magnetic domain 31, the recording method as shown in Fig. 4 is adopted as the recording method of the magneto-optical recording medium. Referring to Fig. 4, the pit 42 and the mirror 44 on the recording film 6a without unsaturated magnetic domains by applying a laser pulse to the laser diode 4 only above the saturation level of the data supplied to the magnetic head 8. Can be formed.
그러나 도 4와 같은 Laser pulse-MFM 방식으로 정보를 광자기디스크에 기록하게 되면 선밀도를 향상시킬 수 있고 비포화자구의 발생을 방지할 수 있는 장점에도 불구하고 광자기디스크의 임의의 위치에 정보를 기록하는 초기시점에서 기록막이 충분히 가열되지 않으므로 초기에 형성되는 피트들(32)이 정상적인 사이즈로 형성되지 않게 되는 문제점이 있다. 이를 상세히 하면 다음과 같다. 도 5를 참조하면, 자기헤드(8)에 공급되는 데이터의 포화레벨 이상에서 동기되는 레이저펄스는 동일한 레벨로 레이저 다이오드(4)에 공급되지만 초기 t1 및 t2 기간동안에 인가되는 레이저펄스에 의해 형성되는 제1 및 제2 피트들(421,422)은 기록막(6a)이 충분히 가열되어 녹지 않으므로 정상적인 피트사이즈보다 작은 사이즈로 기록막(6a)에 형성된다. 레이저 다이오드(4)가 턴-온(turn-on)되어 최초 t1 내지 t3 기간에 인가되는 레이저펄스에 의해 형성되는 제1 내지 제3 피트들(421,422,423)의 사이즈를 비교하면, 시간이 경과할수록 피트 사이즈가 정상적인 피트 사이즈에 가깝게 증가되어 피트열이 비대칭적으로 됨을 알 수 있다. 즉, 기록막(6a)이 점증적으로 가열되기 때문에 제1 피트(421)의 사이즈보다 제2 피트(422)의 사이즈가 커지게 되고 제3 피트(423)에 이르러서는 정상적인 피트 사이즈를 갖게 된다. 정상 사이즈보다 작은 사이즈로 형성되는 초기 피트들(421,422)을 재생하게 되면 그 재생신호에 지터가 포함되어 신호 대 잡음비를 열화시키게 된다.However, when the information is recorded on the magneto-optical disk by the laser pulse-MFM method as shown in FIG. Since the recording film is not sufficiently heated at the initial point of recording, there is a problem that the pits 32 formed initially are not formed in a normal size. This is described in detail as follows. Referring to FIG. 5, the laser pulses synchronized at the saturation level of the data supplied to the magnetic head 8 are supplied to the laser diode 4 at the same level but are formed by the laser pulses applied during the initial t1 and t2 periods. The first and second pits 42 1 and 42 2 are formed in the recording film 6a with a size smaller than the normal pit size because the recording film 6a is sufficiently heated to melt. Compare the sizes of the first to third pits 42 1 , 42 2 , 42 3 formed by the laser pulses that are turned on and applied during the first t1 to t3 periods. In other words, it can be seen that as time passes, the pit size increases closer to the normal pit size, thereby making the pit rows asymmetric. That is, the recording film (6a) is because incrementally heated to the size of the second foot (42 2) than the size of the first foot (42 1) and increases the third foot (42 3) is normal pit size until the Will have When the initial pits 42 1 and 42 2 formed to be smaller than the normal size are reproduced, jitter is included in the reproduced signal to degrade the signal-to-noise ratio.
따라서, 본 발명의 목적은 정보 기록시 정확한 피트열이 형성되도록 한 광자기디스크의 데이터 기록방법 및 장치를 제공하는데 있다.Accordingly, it is an object of the present invention to provide a data recording method and apparatus for a magneto-optical disk which allow an accurate pit array to be formed during information recording.
본 발명의 다른 목적은 정보 재생시 재생신호의 신호 대 잡음(S/N)비를 개선하도록 한 광자기디스크의 데이터 기록방법 및 장치를 제공하는데 있다.Another object of the present invention is to provide a method and apparatus for recording data of a magneto-optical disk which improves the signal-to-noise (S / N) ratio of a reproduction signal during information reproduction.
도 1은 종래의 상변화형 광기록매체의 기록방식을 나타내는 도면.1 is a diagram showing a recording method of a conventional phase change type optical recording medium.
도 2는 종래의 광자기기록매체의 기록방식에서 광세기 변조방식을 이용한 기록방식을 나타내는 도면.2 is a view showing a recording method using a light intensity modulation method in a conventional recording method of a magneto-optical recording medium.
도 3은 종래의 광자기기록매체의 기록방식에서 자계변조를 이용한 기록방식을 나타내는 도면.3 is a diagram showing a recording method using magnetic field modulation in a conventional recording method of a magneto-optical recording medium.
도 4는 종래의 광자기기록매체의 기록방식에서 자계변조를 이용한 다른 기록방식을 나타내는 도면.4 is a diagram showing another recording method using magnetic field modulation in a conventional recording method of a magneto-optical recording medium.
도 5는 도 4에 도시된 기록방식에서 초기 입력 데이터에 의해 형성되는 기록 피트를 상세히 나타내는 도면.FIG. 5 is a diagram showing details of a recording pit formed by initial input data in the recording method shown in FIG. 4; FIG.
도 6은 본 발명의 실시예에 따른 광자기디스크의 데이터 기록장치를 나타내는 블록도.Fig. 6 is a block diagram showing the data recording apparatus of the magneto-optical disk according to the embodiment of the present invention.
도 7은 도 6에 도시된 광자기디스크의 데이터 기록장치의 각 부의 출력 파형 및 기록 피트를 나타내는 도면.FIG. 7 is a diagram showing output waveforms and recording pits of respective parts of the data recording apparatus of the magneto-optical disc shown in FIG. 6;
＜ 도면의 주요 부분에 대한 부호의 설명 ＞<Description of the code | symbol about the principal part of drawing>
2 : 광디스크 2a,6a : 기록막2: optical disc 2a, 6a: recording film
4,54 : 레이저 다이오드 6 : 광자기디스크4,54 laser diode 6: magneto-optical disk
8,58 : 자기헤드 12,22,32,42,72 : 피트8,58: Magnetic head 12,22,32,42,72: Feet
14,24,34,44,74 : 미러 31 : 비포화자구14,24,34,44,74: mirror 31: unsaturated sphere
56 : 대물렌즈 62 : 자기헤드 구동부56: objective lens 62: magnetic head drive unit
64 : 레이저 다이오드 구동부 66 : 동기/변조부64: laser diode driver 66: synchronization / modulator
68 : 레이저 펄스 제어부68: laser pulse control unit
상기 목적들을 달성하기 위하여, 본 발명에 따른 광자기디스크의 데이터 기록방법은 입력 데이터가 초기 입력 데이터열인가를 판별하는 단계와, 초기 입력 데이터열의 공급기간에서 광의 파워를 소정량만큼 증가시키는 단계를 포함한다.In order to achieve the above objects, the data recording method of the magneto-optical disk according to the present invention includes determining whether the input data is an initial input data string, and increasing the power of light by a predetermined amount in the supply period of the initial input data string. Include.
본 발명에 따른 광자기디스크의 데이터 기록장치는 기록막에 광을 조사하기 위한 광원과, 레이저펄스를 생성하여 광원을 구동하기 위한 광원 구동부와, 입력라인으로부터 공급되는 데이터가 초기 입력 데이터열인가를 판별하여 초기 입력 데이터열의 공급기간에서 광의 파워를 소정량만큼 증가시키기 위한 광제어부를 구비한다.The data recording apparatus of the magneto-optical disk according to the present invention includes a light source for irradiating light to a recording film, a light source driver for driving a light source by generating a laser pulse, and whether data supplied from an input line is an initial input data string. And a light control unit for discriminating and increasing the power of light by a predetermined amount in the supply period of the initial input data string.
상기 목적들 외에 본 발명의 다른 목적 및 특징들은 첨부 도면을 참조한 실시예에 대한 설명을 통하여 명백하게 드러나게 될 것이다.Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.
이하, 도 6 및 도 7을 참조하여 본 발명의 바람직한 실시예에 대하여 설명하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 6 and 7.
도 6은 본 발명에 따른 광자기디스크의 데이터 기록장치를 나타내는 블록도이다.6 is a block diagram showing a data recording apparatus of the magneto-optical disk according to the present invention.
도 6의 구성에서, 본 발명에 따른 광자기디스크의 데이터 기록장치는 자기헤드(58)에 접속된 자기헤드 구동부(62)와, 레이저 다이오드(54)에 접속된 레이저 다이오드 구동부(64)와, 자기헤드 구동부(62) 및 레이저 다이오드(64)에 공통으로 접속된 동기/변조부(66)와, 레이저 다이오드 구동부(64) 및 동기/변조부(66)에 공통으로 접속된 레이저 펄스 제어부(68)를 구비한다. 기록될 데이터는 입력라인(61)을 경유하여 동기/변조부(66)와 레이저 펄스 제어부(68)에 공통으로 공급된다. 동기/변조부(66)는 자신에게 입력되는 기준클럭(도시하지 않음)에 따라 기록될 데이터를 샘플링하여 자기헤드 구동부(62)와 다이오드 구동부(64)에 공통으로 공급한다. 레이저 펄스 제어부(68)는 입력라인(61)으로부터 공급되는 입력 데이터가 기록막(6a)에 형성되는 최초 피트에 대응하는가를 판별하여 입력 데이터가 최초 피트에 대응하는 것으로 판별되면 해당 데이터에 해당하는 레이저 펄스를 정상레벨보다 소정레벨만큼 증가시키고 뒤이은 다음 입력 데이터에 해당하는 레이저 펄스를 상대적으로 낮은 레벨만큼 증가시키게 된다. 자기헤드 구동부(62)는 동기/변조부(66)로부터 공급되는 데이터를 자기헤드(58)의 코일에 공급하여 자기헤드(58)로 하여금 광자기디스크(6)의 기록막(6a)에 자계를 형성시키게 한다. 레이저 다이오드 구동부(64)는 동기/변조부(66)로부터 공급되는 데이터의 포화레벨 이상의 신호레벨에서 펄스를 발생시켜 레이저 다이오드(54)에 공급함으로써 레이저 다이오드(54)를 단속하게 된다. 특히, 레이저 다이오드 구동부(64)는 레이저 펄스 제어부(68)의 제어에 의해 최초 입력되는 데이터에 동기되는 펄스와 뒤이어 입력되는 데이터에 동기되는 소정 시간 내의 펄스들을 정상레벨까지 점증적으로 감소시켜 레이저 다이오드(54)에 공급하게 된다.In the configuration of Fig. 6, the data recording apparatus of the magneto-optical disk according to the present invention includes a magnetic head driver 62 connected to the magnetic head 58, a laser diode driver 64 connected to the laser diode 54, Synchronization / modulator 66 commonly connected to magnetic head driver 62 and laser diode 64, and laser pulse controller 68 commonly connected to laser diode driver 64 and synchronization / modulator 66. ). The data to be recorded is commonly supplied to the sync / modulator 66 and the laser pulse controller 68 via the input line 61. The synchronization / modulator 66 samples the data to be recorded according to a reference clock (not shown) input thereto and supplies it to the magnetic head driver 62 and the diode driver 64 in common. The laser pulse controller 68 determines whether the input data supplied from the input line 61 corresponds to the first pit formed in the recording film 6a, and if it is determined that the input data corresponds to the first pit, the laser pulse controller 68 corresponds to the corresponding data. The laser pulse is increased by a predetermined level from the normal level, and the laser pulse corresponding to the next input data is increased by a relatively low level. The magnetic head driver 62 supplies data supplied from the synchronization / modulator 66 to the coil of the magnetic head 58, causing the magnetic head 58 to have a magnetic field on the recording film 6a of the magneto-optical disk 6. To form. The laser diode driver 64 interrupts the laser diode 54 by generating a pulse at a signal level equal to or higher than the saturation level of data supplied from the synchronization / modulator 66 and supplying it to the laser diode 54. In particular, the laser diode driver 64 gradually reduces the pulses synchronized with the data first inputted by the control of the laser pulse controller 68 and subsequently the pulses within a predetermined time synchronized with the data inputted to the normal level, thereby decreasing the laser diode. Supply to (54).
도 7에서 알 수 있는 바와 같이 레이저 펄스 제어부(68)에 의해 입력 데이터가 기록막(6a)에 최초로 형성되는 피트들에 해당하는 데이터로 판별되면 최초 t1 기간에 공급되는 레이저 펄스가 소정레벨만큼 증가되어 레이저 다이오드(54)에 공급되므로 레이저 다이오드(54)로부터 조사된 광의 파워가 증가되어 대물렌즈(56)에 의해 기록막(6a)에 집광된다. 그리고 t2 기간에 공급되는 레이저 펄스가 최초 공급되는 레이저 펄스의 낮은 레벨만큼 증가되어 레이저 다이오드(54)에 공급되므로 레이저 다이오드(54)로부터 조사된 광의 파워가 증가되어 기록막(6a)에 집광된다.As can be seen in FIG. 7, when the input data is determined as data corresponding to the pits first formed in the recording film 6a by the laser pulse controller 68, the laser pulse supplied in the initial t1 period is increased by a predetermined level. And supplied to the laser diode 54, the power of the light irradiated from the laser diode 54 is increased to be focused on the recording film 6a by the objective lens 56. Since the laser pulse supplied in the t2 period is increased by the low level of the laser pulse supplied for the first time and supplied to the laser diode 54, the power of the light irradiated from the laser diode 54 is increased to be focused on the recording film 6a.
이에 따라, t1 기간에 공급되는 레이저 펄스에 의해 조사되는 광의 파워가 커지므로 기록막(6a)이 그 만큼 빠르게 녹여져 제1 피트(721)를 형성시키고, t2 기간에 공급되는 레이저 펄스에 의해 조사되는 광파워의 증가된 레벨만큼 기록막(6a)이 그 만큼 빠르게 녹여져 제2 피트(722)를 형성시키게 된다. t3 기간 이후에는 레이저 다이오드(54)에 일정한 레벨의 레이저 펄스가 공급되어 동일한 파워로 기록막(6a)에 피트들을 형성시키게 된다.As a result, the power of the light irradiated by the laser pulse supplied in the t1 period is increased, so that the recording film 6a is melted so fast to form the first pits 72 1 , and by the laser pulse supplied in the t2 period. The recording film 6a is melted as fast as the increased level of the irradiated optical power to form the second pit 72 2 . After the t3 period, a laser pulse of a constant level is supplied to the laser diode 54 to form pits in the recording film 6a with the same power.
결과적으로, 레이저 다이오드(54)에 인가되는 레이저 펄스의 레벨을 최초 입력 데이터에 대응하는 펄스와 뒤이은 펄스들을 상이한 소정레벨만큼 증가시킴으로써 제1 내지 제3 피트들(721,722,723)의 사이즈가 정상적인 사이즈로서 동일하게 형성된다. 한편, 제4 내지 제6 피트(724,725,726)는 제4 피트(724)의 앞에 위치한 미러들(74)이 비교적 길지 않기 때문에 기록막(6a)이 일정 온도 이상 보온되어 있으므로 동일 레벨의 레이저 펄스에 의해 동일한 사이즈로 형성된다.As a result, the first to third feet 72 1 , 72 2 , 72 3 are increased by increasing the level of the laser pulse applied to the laser diode 54 by a predetermined level different from the pulse corresponding to the initial input data. ) Is the same size as the normal size. On the other hand, in the fourth to sixth feet 72 4 , 72 5 , and 72 6 , since the mirrors 74 located in front of the fourth feet 72 4 are not relatively long, the recording film 6a is kept warm over a predetermined temperature. Therefore, the same size is formed by laser pulses of the same level.
상술한 바와 같이, 본 발명에 따른 광자기디스크의 데이터 기록방법 및 장치는 레이저 다이오드에 최초로 입력되는 레이저 펄스를 소정레벨만큼 증가시켜 레이저 파워를 향상시킴으로써 피트열이 정확하게 형성될 수 있게 된다. 나아가, 피트열이 정확하게 형성되므로 재생신호에서 지터(jitter)가 최소화되어 재생신호의 신호 대 잡음비를 개선할 수 있게 된다.As described above, the data recording method and apparatus of the magneto-optical disk according to the present invention can increase the laser power input by the predetermined level by increasing the laser pulse first input to the laser diode to improve the laser power so that the pit rows can be formed accurately. Furthermore, since the pit rows are formed accurately, jitter is minimized in the reproduction signal, thereby improving the signal-to-noise ratio of the reproduction signal.
이상 설명한 내용을 통해 당업자라면 본 발명의 기술사상을 일탈하지 아니하는 범위에서 다양한 변경 및 수정이 가능함을 알 수 있을 것이다. 따라서, 본 발명의 기술적 범위는 명세서의 상세한 설명에 기재된 내용으로 한정되는 것이 아니라 특허 청구의 범위에 의해 정하여 져야만 할 것이다.Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.
Claims (7)
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| KR960014657B1 (en) * | 1994-01-18 | 1996-10-19 | 삼성전자 주식회사 | Light power control circuit of magneto-optical recording / reproducing device |
| JPH0963093A (en) * | 1995-08-25 | 1997-03-07 | Sony Corp | Laser light output control circuit |
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