• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Only controlling the two pulse levels among the intermediate pulse levels in the energy beam pulse for information recording cannot control the average power of the intermediate pulses, which causes a problem in compatibility of recording. In order to avoid this problem, in the information recording apparatus which forms a recording mark by multi-pulsing an energy beam and irradiating a recording medium, the average power of an intermediate pulse is measured and this is set to a predetermined value. Thereby, the average power of the head pulse, the middle pulse, and the last pulse of the multi-pulse can be controlled with high precision.
    公开号:KR20000071389A
    申请号:KR1020000009744
    申请日:2000-02-28
    公开日:2000-11-25
    发明作者:간도히데히꼬；미네무라히로유끼
    申请人:가나이 쓰토무；가부시키가이샤 히타치세이사쿠쇼；
    IPC主号:
    专利说明:

    Information recording method and recording device {METHOD OF AND APPARATUS FOR RECORDING INFORMATION}
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording method and a recording apparatus using an information recording medium capable of recording information by irradiation of energy beams, and more particularly to an information recording method for recording highly accurate information with compatibility.
    Using a phase change material, a DVD-RAM having a 120mm diameter disc that realizes 2.6GB of storage capacity on one side has been put into practical use. In forming the recording mark, the power of one energy beam is changed by changing between a high power level and a low power level, and the portion (space portion) between the recording marks is used to separate the energy beam with a constant power level. The medium was investigated. That is, in forming one recording mark, the energy beam is made into a multi-pulse, and this multi-pulse is a negative pulse following the leading pulse, the multi-pulse string (middle pulse string), the last pulse, and the last pulse. It consists of four types of pulses (negative pulses). This recording method has the advantage that the so-called overwrite (rewrite by overwriting), which records new information while erasing existing information, becomes possible. The power level of the energy beam is stored in advance in the control data of the recording medium, and the irradiation power of the actual energy beam is determined based on this information.
    In the above prior art, the amount of energy included in the intermediate pulse train is related not only to the high power level and low power level of the intermediate pulse train but also to the duty ratio of the intermediate pulse train. Therefore, only by setting the high power level and the low power level of the intermediate pulse train to a predetermined value, the amount of energy contained in the intermediate pulse train could not be completely controlled. For this reason, the shape of the recording mark formed in the middle pulse train portion is not always controlled to the correct shape, which causes a decrease in compatibility at the time of recording. In particular, when information is recorded at a high density such as 4.7 GB DVD-RAM, if the amount of energy in the middle portion of the recording mark is not controlled stably and is too small, a recording mark with a thinner middle portion is formed, or the size of the rear portion of the recording mark. Has become so small that unnecessary edge shifts occur in the reproduced signal, resulting in a lack of compatibility in recording and reproducing. In addition, if the amount of energy in the middle portion of the recording mark is too large without being stably controlled, a recording mark with a thick middle portion is formed or the size of the rear portion of the recording mark becomes excessively large, causing an unnecessary edge shift in the reproduction signal, resulting in compatibility with recording and reproduction. There was a problem of this lack.
    BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an example of a change over time of the power level of an energy beam irradiated onto a recording medium when information is recorded on the recording medium.
    2 is a configuration diagram of an information recording apparatus.
    <Explanation of symbols for main parts of drawing>
    100: recording medium
    108: cover
    110: motor
    111: axis of rotation
    112: chucking mechanism
    115: rail
    116: rail guide
    117: case
    119: straight gear
    120: rotating gear
    121: Magnet
    123 suspension
    130: objective lens
    132: collimated lens
    133: splitter
    134: detection lens
    135: light detector
    151: Servo Controller
    152: Amplifier
    155: delay circuit
    156: current sink
    157: constant current source
    161, 154: signal processing circuit
    According to one aspect of the present invention, in the case of forming one recording mark on a recording medium, in the information recording method of irradiating a pulse train of an energy beam consisting of a leading pulse, an intermediate pulse train, a last pulse, and a sub pulse subsequent to the last pulse, And, each of the indication values of the power level of the first pulse, the upper and lower power levels of the middle pulse train, the power level of the last pulse, and the power level of the sub-pulse in advance in the control data zone of the recording medium. Adjusting the average power of the head pulse to the power level indication value of the head pulse of the control data zone, and adjusting the average power of the middle pulse train to the upper power level indication value and the lower power level indication value of the control data zone. Adjusting the arithmetic mean to the power level of the last pulse of the control data zone To adjust the average power of the sub-pulse to the power level indication value of the sub-pulse of the control data zone, and to adjust the fluctuation range of the power level of the energy beam of the intermediate pulse train to the upper power level of the control data zone. An information recording method is provided which has each step of adjusting by a difference between a value and a lower power level indication value.
    According to another aspect of the present invention, there is provided an apparatus for controlling the ratio of the average power of each of the first pulse, the intermediate pulse train, and the last pulse to be a predetermined value.
    First, using FIG. 1, an example of the change over time of the power level of the energy beam irradiated to the recording medium at the time of recording information on the recording medium is shown. Here, a method of changing the power level at the time of recording the information over time is generally referred to as write strategy or write strategy. As a specific example, a DVD-RAM will be described as an example. In the case of a DVD-RAM, when the time width of the reference clock in recording and playback is T, the length of the shortest mark to the shortest space is 3T (times three times the length of time T), and is usually the longest mark to the longest. The length of the space is 11T. There are 14T marks and spaces as special patterns.
    When an NRZI signal, which is information to be recorded in time series on a recording medium, is obtained, the NRZI signal is converted into a time series change in the power level of the energy beam by an appropriate signal processing circuit. This time series change in power level is shown in FIG. 1 as a light pulse waveform. The power level is set to four levels of Peak Power, Bias Power 1, Bias Power 2, and Bias Power 3, and the recording medium is in the first state in Bias Power 1, and the recording medium is in the second state in Peak Power, respectively. Can be implemented. Bias Power 3 is at or below the Bias Power 1 level. When the area in the second state is formed on the recording medium, and the length of the area in the second state is 4T or more (that is, when the length of the NRZI signal is 4T or more), the power of Bias Power 3 during the peak power irradiation period. The energy beam is multipulsed by mixing the periods of the levels. Among the multi-pulsed energy beams, the first light pulse is referred to as the leading pulse and the last light pulse as the last pulse. An optical pulse that repeats Peak Power and Bias Power 3 is repeated between the leading pulse and the last pulse according to the length of the NRZI signal, but the number of repetitions is n times (n> 3) when the length of the NRZI signal is n times (n> 3). 4) It is a meeting. The entire repetitive pulse sandwiched between the leading pulse and the last pulse is called an intermediate pulse. Further, a negative pulse (negative pulse) that maintains the power level of Bias Power 2 following the last pulse is irradiated. Bias Power 2 is set to a power level equal to or lower than Bias Power 1. As mentioned above, when forming the area | region of the 2nd state corresponding to NRZI signal of 5T or more length, a recording pulse consists of a head pulse, an intermediate pulse, a last pulse, and a sub pulse. In addition, in the case of forming the region of the second state corresponding to the NRZI signal having the 4T length, the write pulse is composed of a leading pulse, a final pulse, and a sub pulse. In addition, when forming the region of the second state corresponding to the NRZI signal of 3T length, the write pulse is composed of a single light pulse (leading pulse or single pulse) and a sub pulse.
    The reference values of Peak Power, Bias Power 1, Bias Power 2, and Bias Power 3 are media information, which may have been recorded in advance in an appropriate place on the recording medium. In this way, the portion on the recording medium that records the medium information about the recording strategy is called an information track of the control data zone. The reference value of the power level is read from the information track in the control data zone of the recording medium, and the power level at the time of recording is determined with reference to this. The indication of the power level of the leading pulse is Peak Power, the indication of the upper power level of the middle pulse is Peak Power, the indication of the lower power level is Bias Power 3, and the indication of the power level of the last pulse is Peak Power. , The indication of the power level of the negative pulse is Bias Power 2. In the information track, an indication value of the time direction of these pulses may also be recorded.
    First, the definition of the recording waveform is considered in consideration of the case where the region of the second state corresponding to the NRZI signal of 4T or more is formed on the recording medium. And the rise of the first pulse of the write pulse string to the time that has elapsed by T SFP from a defined increase in the NRZI signal, the fall of the first pulse of the write pulse string to the time elapsed as T EFP is defined from the rising of the NRZI signal. The length of the head pulse is T FP , which is equal to the value obtained by subtracting T SFP from T EFP . The rise of the last pulse of the recording pulse string is the rise of the last pulse at the time elapsed by the time T SLP from this reference time with respect to the time preceding the time 2T from the falling time of the NRZI signal. The fall of the last pulse of the recording pulse string is the fall of the last pulse at the time elapsed by the time T ELP from this reference time with respect to the time preceding the time 2T from the fall time of the NRZI signal. The length of the final pulse is T LP , which is equal to the subtracted T SLP from this T ELP .
    There may be an intermediate pulse between the leading pulse and the last pulse. The rise of each pulse of the intermediate pulse train coincides with the reference clock position, and there is a respective pulse drop at the time elapsed by the time T MP at each pulse rise time.
    Subsequently, a case where a region in the second state corresponding to the 3T NRZI signal is formed on the recording medium is considered. The rise of the optical pulse exists at the time elapsed by T SFP from the rise of the NRZI signal. In addition, the fall of an optical pulse has the fall of an optical pulse at the time which passed by time TELP from this reference time with respect to the time preceding by time 2T from the fall time of an NRZI signal.
    Following the last pulse in the recording pulse of 4T or more length, or following the recording pulse of 3T, there is a portion whose power level is Bias Power 2, and this length is T LC .
    T SFP , T EFP , T FP , T SLP , T ELP , T LP , T LC , and T MP , which are the times defining recording pulses, read the reference value from the information track in the control data zone of the recording medium and refer to it. Determine the value.
    T SFP , T EFP , T FP , T SLP , T ELP , T LP , T LC , and T MP, which are the time for defining the recording pulse, do not necessarily have to be constant values, and change depending on the combination of NRZI signals. You may need to. In particular, in the case of a DVD-RAM of 4.7 GB on one side, for example, the shortest 3T length is about 0.42 microns, which is shorter than the recording spot radius of 0.45 microns. In the case where such high density recording is performed, thermal interference between adjacent marks increases, which may make it difficult to always record stably. Thus, it is considered to make the change of the adaptive recording waveform in accordance with the combination before and after the NRZI signal. There are two methods to correct the shift of the front edge.
    1) Fix T SFP by fixing T EFP . At this time, T FP changes according to the change of T SFP .
    2) Fix T SFP by fixing T FP . At this time, T EFP changes according to the change of T SFP .
    In addition, there are the following two methods for correcting the shift of the trailing edge.
    1) Fix T ELP by fixing T SLP . At this time, T LP changes with the change of T ELP .
    2) Fix T ELP by fixing T LP . At this time, T SLP changes according to the change of T ELP .
    Which of the above methods is selected for the control of the front edge and the rear edge depends on the design method of the recording medium and the recording characteristics of the recording medium. Since the manufacturer of the recording medium best knows which of the control methods for controlling the shift between the front edge and the rear edge, the manufacturer of the recording medium is the information recording apparatus which method should be selected for the control method for the edge shift. You can recommend it. That is, the manufacturer of the recording medium records the recommendation of the edge shift control method at a specific place of the recording medium, and the information recording apparatus reads this information to determine the edge shift control method. In this case, the information recording apparatus can be used without leaving the intended media characteristics by the manufacturer of the recording medium, and the information can be recorded stably. The manufacturer of the recording medium also prepares a lookup table for edge shift control and records it on the recording medium. By reading this lookup table and performing edge shift control using this as a reference, the information recording apparatus can be used without leaving the media characteristics intended by the manufacturer of the recording medium. It becomes possible to do it. According to the above studies, it is possible to provide a means capable of attaining high compatibility while recording compatibility.
    In the lookup table for all edges, when the length of the mark to be recorded is set to M (n), and the length of the space preceding the mark is set to S (n-1), M (n) and S ( The values determined by the combination of n-1) are listed, and both positive and negative values can be taken.
    In the lookup table for the back edge, when the length of the mark to be recorded is set to M (n) and the length of the space preceding the mark is set to S (n + 1), M (n) and S ( The values determined by the combination of n-1) are listed, and both positive and negative values can be taken.
    As described above, by changing the T SFP and the T ELP according to the combination of the front and rear of the NRZI signal, the mark edge position can always be controlled with high precision.
    Recording compatibility when recording information using the above-described recording strategy will be discussed.
    It is said that the compatibility between recordings can be stably recorded with the same write strategy between different devices, and that the recording marks recorded by either of these devices are also read as reproduction signals having the same characteristics. In a recordable optical disc device, in order to realize that the information medium can be exchanged, it is essential that the recording compatibility be the same as that of the reproduction compatibility. This requires the following conditions:
    1) There is no excessive overshoot or undershoot in the recording waveform.
    2) The amount of energy (or average level of the pulse, which is the value obtained by dividing the energy contained in the pulse by the sustain time of the pulse) contained in each of the leading pulse, the intermediate pulse, the last pulse and the sub pulse, is controlled to a predetermined value.
    3) The energy beam maintaining the power level of Bias Power 1 is stably emitted, and the value of Bias Power 1 is controlled to a predetermined value. Alternatively, the average power of the Bias Power 1 level maintenance period is controlled to a predetermined value.
    In a phase change medium such as a DVD-RAM, in order to ensure recording compatibility, the condition of 2) is particularly important. That is, the head pulse serves to start the melting of the recording film by irradiating the recording medium with a large average power, the middle pulse keeps the melting of the recording film with a relatively low average power, and the final pulse stabilizes the shape behind the recording mark. For this purpose, a slightly larger average power is applied while a small average power negative pulse is followed to achieve shape stability behind the recording mark. In this way, since the role of the recording pulse is different from each of the leading pulse, the intermediate pulse, the last pulse, and the Bias Power 3 level sustain pulse, it is necessary to precisely control the ratio between each value or each value.
    In the actual recording apparatus, since the amount of irradiation energy of the energy beam changes due to temperature fluctuations or the like, first of all, the ratio between the average powers of the first pulse, the intermediate pulse, the last pulse and the negative pulse is controlled, and then the ratio between them. The overall power level is increased or decreased while maintaining the optimum power. By doing in this way, there is an effect that the recording pulse which can always realize the recording mechanism suitable for the recording medium can be accurately determined. In addition, if the amount of irradiation energy does not change, what is necessary is just to control the average power of each of a head pulse, an intermediate pulse, a last pulse, and a sub pulse.
    If the average power of each pulse of 2) is controlled to about 5% from the error from the value to be set, the compatibility of recording can be almost maintained. In the situation where the average power is controlled in this manner, the allowable amount of overshoot or undershoot in 1) is allowed up to ± 10% of the power level to be set or to ± 10% of the power level variation. Since the recording pulse is a pulse train of very high speed, overshoot and undershoot are likely to occur frequently. However, if only the condition of 2) is allowed, a large allowance is allowed for 1), and the device design becomes easy. As a result, it becomes possible to easily realize a recording apparatus with stable performance, and to perform recording and reproducing stably and interchangeably. In addition, 3) above, Bias Power 1 is a quasi-DC level existing between the multi-pulse strings of one group and the multi-pulse strings of the next group, and there is no great difficulty in suppressing this precision to about 5%.
    Even if the average power of the intermediate pulse train is set to a predetermined value, the variation range of the power level is not necessarily guaranteed because of the influence of the overshoot or undershoot of the intermediate pulse train. In the case of a phase change recording medium such as a DVD-RAM, even if the average power of the intermediate pulse train is a predetermined value, if the variation range of the power level is too large or small, the formation of the intermediate portion of the recording mark cannot be performed with sufficient precision. . The specified value of the change range of the power level of the intermediate pulse train is the value obtained by subtracting the Bias Power 3 indication from the Peak Power indication. Is allowed. For this reason, if the average power of the intermediate pulse train is adjusted to the accuracy of ± 5% from the indicated value, an error of about 10% is allowed for the upper power and the lower power of the intermediate pulse train, respectively.
    Sufficient recording compatibility can be maintained by setting the target value of the average power of each pulse as follows. In other words, the average power level of the leading pulse is set to ± 5% of the Peak Power indication value. In addition, the average power level of the intermediate pulse is defined as Middle Power indication value ± 5% when the Middle Power indication value is defined as 0.5 × (indication value of Peak Power + indication value of Bias Power 3). In addition, the average power level of the last pulse shall be ± 5% of the peak power indication value. In addition, the average pulse level of the negative pulse shall be ± 5% of the indication value of Bias Power 2. In addition, the average power level of Bias Power 1 level shall be the indication value +/- 5% of Bias Power 1 level. In addition, the indication values of Peak Power, Bias Power 1, Bias Power 2, and Bias Power 3 may be recorded in the control data of the recording medium, and in this case, these can be read and used.
    Even when adjusting the ratio of each pulse in advance, first, power setting of each pulse is performed as mentioned above. Then, the power of each pulse is increased or decreased to find the optimum power so that the ratio of the average power between these pulses does not change.
    In practice, the following method is considered as one of methods for determining the average power level of the head pulse from the temporal change of the power irradiated to the recording medium. That is, consider the time 1 at which the leading pulse level passes upward starting from the line of X% of the power level to be set, and the time 2 at the last passing of the X% line of power level to be set by the leading pulse level. The power level between these two times is integrated and divided by the integration time is the average power level of the leading pulse. Here, X% may be determined by 90% or 95% depending on the circumstances of the device.
    In practice, the following method is considered as one of methods for determining the average power level of the intermediate pulse from the temporal change of the power irradiated to the recording medium. Here, since the intermediate pulse can be realized only by recording marks having a length of 5T or more, it is considered only for recording marks having a length of 5T or more. If the length of the NRZI signal is nT (n> 4), the time window of (n-4) T is considered. Considering the two time 1 and the time 2 separated by two time window times, these two time are set such that all intermediate pulses are included between these two time. The average power level of the intermediate pulses is integrated by dividing the power level between these two times and dividing by the integration time.
    In practice, the following method is considered as one of methods for determining the average power level of the last pulse from the temporal change of the power irradiated to the recording medium. In other words, take into account the time 1 when the last pulse level passes upwards starting from the line of Y% of the power level to be set, and the time 2 when the last pulse level passes the Y% line of the power level to be set downward. Then, the power level between these two times is integrated and divided by the integration time is the average power level of the final pulse. Here, Y% may be determined according to the circumstances of the device, 90% or 95%.
    In practice, the following method is considered as one of methods for determining the average power level of the sub pulses from the temporal change of the power irradiated to the recording medium. That is, taking into account the time 1 at which the negative pulse level passes downward starting from the line of Z% of the power level to be set, and at the time 2 at the last passing downward of the Z% line of the power level to be set by the negative pulse, The average power level of the negative pulses is the integral of the power level between these two time points and divided by the integration time. In this case, Z% may be determined based on 110% or 105% of the device. However, when the Bias Power 2 level and the Bias Power 1 level are the same or there are few differences, it may be difficult to define the time 2. In such a case, considering the time 1 and the time 2 after the time that the Bias Power 2 level has to be maintained at the time 1, the power level between these two times is integrated and divided by the integration time. The average power level is sufficient.
    In practice, the following method is considered as one of methods for determining the average power level of the Bias Power 1 level from the temporal change of the power irradiated to the recording medium. In other words, considering the time 2 used to obtain the average power level of the sub-pulse and the time 3 passing through the W% line of the power level to be set by the Bias Power 1 level upward, the two time 2 and the time 3 Integrating the power level and dividing this by the integration time is the average power level of the Bias Power 1 level. Here, W% may be determined based on 110% or 105% of the device. However, since the holding time of the Bias Power 1 level is long, when the power is determined by the average power, it is not possible to suppress a relatively slow power fluctuation that adversely affects the erasing characteristics.
    Next, another embodiment of the present invention will be described with reference to FIG. 2 is a block diagram of an information storage device. Incidentally, for the sake of explanation, it is shown that the recording medium 100 is mounted in the information storage device. The recording medium 100 is essential for storing information, but the recording medium 100 is detached from or attached to the information storage device as necessary.
    2, a chucking mechanism 112 is attached to the rotating shaft 111 of the motor 110 attached to the lid 108, and the chuck mechanism 112 holds the recording medium 100. As shown in FIG. The chuck mechanism 112 is a holding mechanism of the recording medium 100. In addition, the motor 110, the rotating shaft 111, and the chuck mechanism 112 constitute a moving mechanism for relatively moving the recording medium 100 and the energy beam.
    The lid 108 is attached to the lid 108. The case 117 has a rail guide 116 guided to the rail 115. In addition, a linear gear 119 is attached to the case 117, and a rotary gear 120 is attached to the linear gear 119. By transmitting the rotation of the rotary motor 118 attached to the lid 108 to the rotary gear 120, the case 117 linearly moves along the rail 115. The direction of this linear motion is almost the radial direction of the recording medium 100.
    A magnet 121 is attached to the case 117. In addition, the case 117 includes a suspension 123 which allows the objective lens 136 to be movable only in two directions, substantially in the normal direction of the recording surface of the recording medium 100 and in almost the radial direction of the recording medium 100. Through the objective lens 136 is attached. In addition, a coil 122 is attached to the objective lens 136 so as to almost face the magnet 121. By passing a current through the coil 122, the magnetic lens 136 moves in two directions, substantially normal to the recording surface of the recording medium 100 and nearly radial direction of the recording medium 100, by a magnetic effect. Can be. The rails 115, the rail guide 116, the case 117, the magnet 121, the suspension 123, the coil 122, the objective lens 136, the energy beam is a predetermined position on the recording medium 100 The positioning structure positioned at
    The case 117 is attached with a semiconductor laser 131 which is an energy beam generator. The energy beam emitted from the semiconductor laser 131 passes through the collimating lens 132 and the beam splitter 133 and passes through the objective lens 136. A portion of the light emitted from the objective lens 136 is reflected by the recording medium 100, passes through the objective lens 136, is reflected by the beam splitter 133, is collected by the detection lens 134, and is then detected by a photodetector ( 135, the light intensity is detected. The photodetector 135 is divided into a plurality of light receiving areas. The light intensity detected in each light receiving area is amplified by the amplifier 152 and simultaneously calculated, and information (servo signal) and information reading of the relative positional relationship between the light spot focused on the objective lens 136 and the recording medium 100 are read. The signal is detected. The servo signal is transmitted to the servo controller 151. The read signal is also sent to the decoder 153.
    When the recording medium 100 is attached to the information storage device, and the chuck mechanism 112 fixes the recording medium 100, the detector 14 operates to send the signal to the system controller 150. The system controller 150 receives it and controls the motor 110 to rotate the recording medium 100 to an appropriate rotation speed. In addition, the system controller 150 controls the rotary motor 118 to position the case 117 at an appropriate position. In addition, the system controller 150 emits the semiconductor laser 131 and simultaneously operates the servo controller 151 to operate the rotary motor 118 or to flow a current through the coil 123 so that the objective lens 136 The focal spot to be formed is positioned at a predetermined position on the recording medium 100. Subsequently, the servo controller 151 sends a signal to the system controller 150 in which a focal spot is formed on the recording medium 100. The system controller 150 receives an instruction from the decoder 153 to decode the signal to be read. If the track to be read is not the information track of the control data zone, the system controller 150 instructs the servo controller 151 so that the focus spot is positioned on the information track of the control data zone. As a result of the above operation, the system controller 150 reads the information track of the control data zone to read the media information related to the recording.
    In the information track of the control data zone, the parameters of the recording strategy described in FIG. 1 are recorded. The system controller 150 reads information such as the recording power level, the temporal relationship between each recording pulse, the lookup table, and the like from the recording medium 100. The system controller 150 records the parameters of these write strategies in the parameter table of the signal processing circuit 154, the parameter table of the delay circuit 155, and the current sink amount parameters of the current sink 156.
    When an instruction for reproducing information is sent from the upper controller through the input connector 159, the system controller 150 instructs the servo controller 151 to position the focus spot at an appropriate position on the recording medium 100, The signal obtained by the photodetector 135 is decoded by the decoder 153, and then the information read through the output connector 158 is sent to the host controller.
    When the instruction to record the information and the information to be recorded are sent from the upper controller through the input connector 159, the system controller 150 instructs the servo controller 151 to position the focus spot at the appropriate position on the recording medium 100. Position on. In addition, the information to be recorded is converted into an NRZI signal through the signal processing circuit 161. The signal converted into the NRZI signal is converted into a plurality of suitable pulse trains through the signal processing circuit 154. These pulse trains pass through the delay circuit 155 and are passed to the current sink 156. Here, the signal processing circuit 161 and the signal processing circuit 154 constitute a signal processing circuit for converting information to be recorded into a column of recording pulses.
    A constant current source 157 is connected to the semiconductor laser 131 so that the sum of the currents consumed by the semiconductor laser 131 and the current sink 156 is always a constant value. A plurality of current sinks 156 are connected to the constant current source 157. Whether the current sink 156 operates to draw current depends on the signal generated by the processing circuit 154 and passed through the delay circuit 155. By operating the current sink 156, part of the current coming from the constant current source 157 is sucked into the current sink 156, and as a result, the amount of current flowing into the semiconductor laser 131 is lowered. This converts the energy level of the energy beam generated by the semiconductor laser 131. The signal processing circuit 154 and the delay circuit 155 operate the plurality of current sinks 156 at an appropriate timing, thereby realizing the write strategy shown in FIG.
    In order to perform the above operation, the information recording apparatus is supplied with power from the outside via the terminal 160.
    In the above-described information recording apparatus, there are the following two methods as an example of a method of realizing the information recording method described in FIG.
    1) Measure the power of the energy beam emitted from the objective lens with a power meter and measure the average power level of the leading pulse, the middle pulse train, the last pulse and the sub pulse. Here, in order to measure the power of the energy beam emitted from the objective lens, there is a method of installing a power meter immediately after the objective lens, or a method of detecting a part of the emitted light of the energy beam generator. Adjust the indication to the current sink or delay circuit so that the measured value of the average energy beam of each pulse coincides with the respective indication or each measurement is a multiple of each indication (a is a real number). do. When each measured value is set to be a multiple of each indicated value (a is a real number), the information is recorded on the recording medium while the value of a is converted, reproduced, and based on the error information detected by the decoder, Adjust the value of a so that this is the smallest. When the value of a finally obtained is set to a1, the power level of the optimal recording pulse is a1 times the indicated value. The system controller stores therein the order in which the sequence should be controlled.
    2) In the case of an information recording apparatus that does not have a function of directly measuring the average power of each pulse, the information recording method substantially described in Fig. 1 is realized in the following order. That is, in the case of the information recording apparatus which produces a simple structure and a large quantity, there are many gaps in the precision of the power direction of a recording pulse, and the precision of a time direction. In order to suppress such a gap, the head pulse, the last pulse, only the negative pulse, etc. add power, and in the middle pulse train, the average power is added by the sum of the power and the duty adjustment of the pulse. As a result, a good recording waveform can be produced in which the power of each of the head pulse, the middle pull string, the last pulse string, and the sub pulses is balanced. In addition, by adjusting the power level of each pulse while obtaining a constant power ratio between these pulses, an optimum recording power suitable for a recording medium can always be obtained. The system controller stores therein the order in which the above sequence should be controlled.
    According to the embodiment of the present invention described above, it is possible to ensure stable recording compatibility at all times, and to reduce the overshoot and undershoot restrictions on the recording waveforms, thereby facilitating the design of the recording apparatus. As a result, A recording device with high reliability and compatibility can be realized.
    权利要求:
    Claims (4)
    [1" claim-type="Currently amended] When forming one recording mark in the recording medium, information recording for irradiating a pulse train of an energy beam consisting of a head pulse, an intermediate pulse train following the first pulse, a last pulse following the intermediate pulse train, and a sub pulse subsequent to the last pulse train. In the method,
    Recording each indication value of the power level of the first pulse, the upper and lower power levels of the intermediate pulse train, the power level of the last pulse, and the power level of the sub-pulse in the control data zone of the recording medium in advance; ;
    Adjusting the average power of the leading pulse to the power level indication value of the leading pulse of the control data zone;
    Adjusting the average power of the intermediate pulse train to an arithmetic mean value of an upper power level indication value and a lower power level indication value of the control data zone;
    Adjusting the average power of the last pulse to the power level indication of the last pulse of the control data zone;
    Adjusting the average power of the sub pulses to a power level indication of the sub pulses of the control data zone; And
    Adjusting a fluctuation range of the power level of the energy beam of the intermediate pulse train by a difference between an upper power level indication value and a lower power level indication value of the control data zone.
    Information recording method comprising a.
    [2" claim-type="Currently amended] When forming one recording mark in the recording medium, information recording for irradiating a pulse train of an energy beam consisting of a head pulse, an intermediate pulse train following the first pulse, a last pulse following the intermediate pulse train, and a sub pulse subsequent to the last pulse train. In the method,
    Recording each indication value of the power level of the first pulse, the upper and lower power levels of the intermediate pulse train, the power level of the last pulse, and the power level of the sub-pulse in the control data zone of the recording medium in advance; ;
    adjusting a mean power of the head pulse to a value of (power level indication value xa of the head pulse of the control data zone) when a is a mistake;
    Adjusting the average power of the intermediate pulse train to the value of (the arithmetic mean value of the upper power level indication value and the lower power level indication value of the control data zone × a), the average power of the last pulse (the control data zone Adjusting to the value of the power level indication xa) of the last pulse;
    Adjusting the average power of the sub pulses to a value of (power level indication value xa of the sub pulses of the control data zone);
    Adjusting the fluctuation range of the power level of the energy beam of the intermediate pulse train to a value of (difference xa between an upper power level indication value and a lower power level indication value of the control data zone); And
    After adjusting the power of each pulse by using a value of a, the recording medium and the recording / playback characteristic are measured while changing the value of a, and the value obtained by obtaining the best recording or recording / playback characteristic is obtained. Steps to Ensure Optimal Recording Power
    Information recording method comprising a.
    [3" claim-type="Currently amended] An energy beam generator, a power adjusting mechanism capable of adjusting a power level of the energy beam generated by the energy beam generator, a holding mechanism capable of holding a recording medium, a moving mechanism capable of relatively moving the energy beam and the recording medium, and recording A signal processing circuit for converting information to be converted into a power level of the energy beam,
    When one recording mark is formed on the recording medium, a pulse train of energy beams consisting of a leading pulse, an intermediate pulse train following the leading pulse, a last pulse following the intermediate pulse train, and a sub pulse following the last pulse are stored in the recording medium. Investigated,
    An information recording apparatus according to claim 1 or 2, wherein the optimum energy beam power when recording on the recording medium is determined.
    [4" claim-type="Currently amended] An information recording apparatus for forming a recording mark by irradiating an energy beam to a separately mounted recording medium,
    Means for irradiating an energy beam forming one recording mark on the recording medium; And
    Control means for controlling the multi-pulse indicative of the timing of irradiation of the energy beam so that the average power of the head pulse, the last pulse and the middle pulse excluding the head pulse and the last pulse becomes a predetermined ratio.
    An information recording apparatus comprising a.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1999-04-13|Priority to JP10488399A
    1999-04-13|Priority to JP1999-104883
    2000-02-28|Application filed by 가나이 쓰토무, 가부시키가이샤 히타치세이사쿠쇼
    2000-11-25|Publication of KR20000071389A
    2005-12-06|Application granted
    2005-12-06|Publication of KR100533557B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP10488399A|JP3762847B2|1999-04-13|1999-04-13|Information recording method and information recording apparatus|
    JP1999-104883|1999-04-13|
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