Patent Publication Number: US-2007109933-A1

Title: Recording position deviation correction apparatus, recording position deviation correction method, and recording position correction program

Description:
TECHNICAL FIELD  
      The present invention relates to a recording position correction apparatus, a recording position correction method, and a recording position correction program and, more particularly, to those which correct deviations in the recording positions when performing additional recording from a position which is successive to the data region on an optical disc where recording was already performed.  
     BACKGROUND ART  
      Recently, optical discs which recordings of data therein such as DVD-RAM, DVD-R/RW, DVD+R/RW have been successively sold out, and have been used in various fields. Among those, DVD-RAM has recording areas for recording data which are divided in sector units, and divisional recording of recording data into discrete areas respectively is made possible. Meanwhile, when recording of data in DVD-R/RW and DVD+R/RW in which recording is once made is additionally made (this recording is called hereinafter as additional recording), the additional recording is performed from a region which is successive to an end position of the recorded region in the disc.  
      However, when performing this additional recording of data, the positional deviation may arise at the joint portion between the recorded region and the region where the additional recording is performed, thereby unfavorably influencing the recording and reproduction of the data.  
      More particularly, when the data recorded in a disc is reproduced, it is necessary to take a synchronization with a data unit that is determined in the decoding processing, and in order to satisfy the same, a synchronization signal is periodically inserted into the data before being reproduced. Then, if there has arisen a deviation in the position of the recorded data, there may be no detection or an error detection of the SYNC signal which results in incapability of reproduction of the recorded data. In order to avoid occurrence of such problem, it was an ideal that recorded data region and the additional recording region are perfectly continuous to each other. However, in the actual additional recording, a recording position deviation would unavoidably arise.  
      As a prior art technique to solve this problem of recording position deviation, there is a patent reference No. 1 (Japanese patent application No. 2001-245522). In this reference No. 1, the deviation between the physical address such as an LPP which is embedded in a disc and the SYNC position is measured during the additional recording, and the SYNC data is compressed in accordance with the direction of the deviation, thereby to correct the recording positional deviation arising accompanying the additional recording.  
      However, while in the technique of the recording position deviation correction in the reference No. 1, that the physical address is already detected is required as an assumption for its application since the positional deviation of the recording data is measured with taking the physical address such as an LPP which is embedded in the disc as a reference, the detection of the physical address having a high reliability in the additional recording processing is difficult because of the following reasons:  
      The first reason is as follows:  
      In the recording processing, the writing in into a disc is carried out by using a strong laser for recording a mark and a weak laser for recording a space separately. Therefore, when a space is recorded when passing the physical address position during the recording processing, the signal level of the physical address which is detected is unfavorably lowered accompanying with the intensity of the laser power which is irradiated to a disc, thereby it is difficult to detect the physical address with a high precision. Also this problem becomes obvious as the speed of the recording processing becomes multiple high speed. This is because the laser power at recording a space is decreased with relative to that at recording a mark as the speed at the recording processing becomes multiple high speed.  
      The second reason is as follows:  
      The timing immediately after starting the additional recording processing is immediately after changing the processing from the reproduction processing for searching the end position of the recorded region to the recording processing for additionally recording additional data. More particularly, it is immediately after the intensity of the laser light that is irradiated to the disc is changed from a predetermined laser intensity that is irradiated to the disc at the reproduction processing to a predetermined laser intensity that is irradiated to the disc at the recording processing. Then, such a state immediately after the start of the additional recording processing becomes a state where the detection of the physical address position is unstable and the detection of the physical address having a high reliability is very difficult. Thus, immediately after the start of the additional recording processing, particularly it becomes difficult in detecting the physical address position having a high reliability.  
      Since it is difficult to always detect the physical address having a high reliability in the additional processing as described in the above two reasons, it is not possible to accurately measure the recording position deviation that is detected with taking the physical address position as a reference, and therefore, even when the prior art recording position deviation correction technique is applied, it was not possible to carry out recording position deviation correction of a high precision.  
      The present invention is directed to solving such a problem and has its object to provide a recording position deviation correcting apparatus, a recording position deviation correcting method, and a recording position deviation correcting program which can detect the positional deviation amount by using the physical address position information having a high reliability even when performing the additional recording continuously to the data region on the disc where the recording is already performed, and thereby enables performing a high quality recording position deviation correction. 
          (Patent Reference No. 1) Patent application: 2001-245522        

     DISCLOSURE OF THE INVENTION  
      In order to solve the above-described problems, a recording position deviation correction apparatus of the present invention performs an interpolation processing on the basis of the high reliability physical address which is detected before executing the additional recording processing, without detecting the physical address from an optical disc, to detect the physical address position which is used during the additional recording processing, at carrying out the additional recording processing which carries out recording of data continuously to the data region where the recording is already performed on an optical disc, and performs the recording position deviation correction at the additional recording processing, using the detected physical address position.  
      Thereby, since the physical address position during performing the additional recording processing is detected on the basis of the physical address position having a high reliability that is detected before the additional recording processing, a high reliability physical address position can be obtained even during performing the additional recording processing, and thereby a high quality recording position deviation correction can be realized using the same.  
      Further, a recording position deviation correction apparatus of the present invention includes a physical address position interval measuring section which measures the detection interval of the physical address position on the basis of the wobble signal which is recorded on an optical disc, while detecting the physical address position by an interpolation processing.  
      Thereby, utilizing the nature of the wobble signal that its period changes in accordance with the rotation speed of the optical disc and the period number for each physical address position interval is constant regardless of the rotation speed of the optical disc, it is possible to stably generate one sector period interval regardless of the speed of the disc, and thereby a high precision interpolation processing is enabled.  
      Further, a recording position deviation correction apparatus of the present invention includes a physical address position interval measuring section which measures the detection interval of the physical address position using a timer section.  
      Thereby, it is possible to measure the detection interval of the physical address position by the timer section, and thereby a high precision interpolation processing on the basis of the measured physical address position detection interval is enabled.  
      Further, the recording position deviation correction apparatus of the present invention calculates the recording position deviation amount at the final sector in the recorded region from the physical address position in the reproduction processing immediately before performing the additional recording processing and the sector top position corresponding thereto, without detecting the physical address position from a disc, and then perform the recording position deviation correction on the basis of the recording position deviation amount, at carrying out an additional recording processing which carries out recording continuously to the data region where the recording is already performed on an optical disc.  
      Thereby, it is possible to detect the recording position deviation amount at the final sector in the recorded region having a high reliability using the physical address which is detected in the reproduction processing immediately before the additional recording processing, and it is possible to carry out a high quality recording position deviation correction utilizing that the recording position deviation amount at the final sector in the recorded region and the positional deviation correction amount that is required to be corrected in the additional recording processing are approximately equal to each other.  
      Further, the recording position deviation correction apparatus of the present invention includes a laser control section which controls the laser output which is irradiated by an optical head so that data which has a high physical address detection probability at the reproduction are recorded irregardless of the data to be recorded at the physical address detection timing at the final several sectors within the recording processing range.  
      Thereby, it is possible to record data which has a high physical detection probability at the reproduction at the end of the recording processing range by the laser control section, and it is possible to enhance the reliability of the physical address position detection in the reproduction processing immediately before the additional recording processing, and therefore, the recording position deviation amount at the final sectors in the recorded region can be calculated with high precision, and a higher quality recording position deviation correction is carried out.  
      Further, the recording position deviation correction apparatus of the present invention includes a laser control section which controls the laser output which is irradiated by an optical head so that a laser which has a high physical address position detection probability is irradiated irregardless of the data to be recorded at the physical address detection timings during the recording processing.  
      Thereby, since the laser of a constant intensity is always irradiated at the physical address position detection timing during the recording processing, the reliability of physical address position detection by the physical address position detection section during performing the recording processing can be enhanced, and a high quality recording position deviation correction can be carried out.  
      Further, the recording position deviation correction apparatus of the present invention includes a physical address obtaining optical head which irradiates a constant power laser light which does not influence on the recording processing, prior to irradiating a laser light for performing a recording processing.  
      Thereby, since the detection of physical address position can be carried out from the reflection light against the laser power of a constant intensity which is irradiated from a physical address obtaining optical head, it is possible to obtain a high reliability physical address position, and possible to carry out a high quality recording position deviation correction.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a diagram illustrating a whole construction of an optical disc apparatus according to a first embodiment of the present invention.  
       FIG. 2  is a diagram explaining the interpolation processing of the physical address position by the physical address position interpolation section.  
       FIG. 3  is a flowchart illustrating the recording position deviation correction amount calculation algorism by the recording position deviation amount correction section in the first embodiment of the present invention.  
       FIG. 4  is a block diagram illustrating another construction of an optical disc device according to the first embodiment of the present invention.  
       FIG. 5  is a block diagram illustrating a whole construction of an optical disc apparatus according to a second embodiment of the present invention.  
       FIG. 6  is a flowchart illustrating a recording deviation correction amount calculation algorism by the recording position deviation correction control section according to the second embodiment of the present invention.  
       FIG. 7  is a block diagram illustrating a whole construction of an optical disc apparatus according to a third embodiment of the present invention.  
       FIG. 8  is a flowchart illustrating a laser control algorism by a laser control section according to the third embodiment of the present invention.  
       FIG. 9  is a block diagram illustrating a whole construction of an optical disc apparatus according to a fourth embodiment of the present invention.  
       FIG. 10  is a flowchart illustrating a laser control algorism by a laser control section according to the fourth embodiment of the present invention.  
       FIG. 11  is a block diagram illustrating a whole construction of an optical disc apparatus according to a fifth embodiment of the present invention. 
    
    
     DESCRIPTION OF THE NUMERALS  
     
         
           100  optical disc  
           101 ,  201 ,  301 ,  401 ,  501  recording position deviation correction apparatus  
           102  spindle motor  
           103  optical head  
           104  modulation/de-modulation part  
           105  error correction/addition part  
           106  data buffer section  
           107  host interface section  
           108  host  
           109  physical address position detection section  
           110  physical address position storing section  
           111  physical address position interval measuring section  
           112  physical address position interpolation section  
           113  sector top address position detection section  
           114   403 ,  503  recording position deviation correction control section  
           115 ,  202 ,  403 ,  503  recording position deviation correction control section  
           116  timer section  
           202  sector top position storing section  
           302 ,  402  laser control section  
           502  physical address obtaining head  
       
    
     BEST MODES EMBODING THE INVENTION  
      Hereinafter, embodiments of the present invention will be described with reference to the drawings.  
     Embodiment 1  
      The recording position deviation correcting apparatus according to a first embodiment of the present invention functions to perform an interpolation processing on the basis of the physical address position which is detected before performing additional recording processing, without detecting the physical address position from a disc, to obtain the physical address position during performing the additional recording processing, at carrying out the additional recording processing which carries out recording of data continuously to the data region where the recording is already performed on an optical disc, and performs the recording position deviation correction in the additional recording processing, using the physical address. The content thereof will be described with reference to FIGS.  1  to  4 .  
       FIG. 1  is a block diagram illustrating a whole construction of an optical disc apparatus according to the first embodiment of the present invention.  
      In  FIG. 1 , the optical disc apparatus of the first embodiment of the present invention includes a recoding position deviation correction apparatus  101 , a spindle motor  102 , an optical head  103 , a modulation/demodulation section  104 , an error correction/addition section  105 , a data buffer section  106 , and a host interface section  107 , and a host  108 .  
      The recording position deviation correction apparatus  101  performs an interpolation processing on the basis of the physical address position which is detected before performing the additional recording processing, without detecting the physical address from a disc, at carrying out the additional recording processing which carries out recording of data continuously to the data region where the recording is already performed on an optical disc  100  to detect the physical address position, and performs the recording position deviation correction in the additional recording processing from the detected physical address position and the sector top position of the recording and reproduction data.  
      The spindle motor  102  rotates the optical disc  100 .  
      Further, the optical head  103  carries out recording and reproduction against the optical disc  103  by irradiating of a laser and receiving of the reflected light.  
      The modulation/demodulation section  104  modulates the data which is transmitted from the error correction/addition section  105  or demodulates the signal read out from the optical disc  100 .  
      The error correction/addition section  105  performs correction of error data included in the data demodulated by the modulation/demodulation section  104  or adds error correction code to the recorded data stored in the data buffer section  106 .  
      The data buffer section  106  stores the recording or reproduced data temporary and the host I/F section  107  communicates the recording data or reproduced data with the host  108  such as a computer.  
      Next, an operation of the recording position deviation correction apparatus  101  will be described in detail.  
      The recording position deviation correction apparatus  101  includes the physical address position detection section  109 , the physical address position storing section  110 , the physical address position interval measuring section  111 , the physical address position interpolation section  112 , the sector top position detecting section  113 , the recording position deviation correction and control section  114 , and the recording position deviation correction section  115 .  
      The physical address position detection section  109  detects the physical address signal which is embedded in the optical disc  100 , from the signals of the reflected lights which are obtained from the optical head  103  during performing the recording and reproduction processing against the optical disc  100 , and detects the position.  
      The physical address position storing section  110  stores the physical address that is detected by the physical address position detection section  109 .  
      The physical address position interval measuring section  111  detects the interval between the continuous physical address positions. Here, the physical address position interval measuring section  111  detects the intervals between the physical address positions utilizing wobble signals which are included in the reflection light signals obtained from the optical head  103 . This can be carried out by utilizing that wobble signals are periodic signals which are included in the reflection light signals that are obtained by irradiating a laser light for recording and reproduction to the optical disc  100 , and that the periods of those would change according to the rotation speed of the optical disc  100 , and the period numbers for respective physical address position intervals become constant irrespective of the rotation speed of the optical disc  100 . In this way, the physical address position interval measuring section  111  can detect a correct physical address position interval by detecting the period numbers of the wobble signals.  
      The physical address position interpolation section  112  interpolates the physical address position using the physical address position interval information that is obtained from the physical address position interval measuring section  111  on the basis of the physical address position information that is stored in the physical address position storing section  110 . Here,  FIG. 2  shows a diagram illustrating the interpolation processing for interpolating the physical address positions by the physical address interpolating section  112 . As shown in  FIG. 2 , the physical address position interpolation section  112  repeatedly applies the physical address position intervals that are obtained from the physical address position interval measuring section  111  to the physical address position information that are obtained from the physical address position storing position  110 , thereby obtaining desired physical addresses by interpolation.  
      The sector top position detecting section  113  detects the top position for each sector in the recording and reproduced data, and it detects the sector top position by detecting the synchronous signal of included in the recording and reproduced data. Further, the methods of detecting the sector top position at reproduction and at recording are different from each other. That is, the detection of the sector top position at reproduction is carried out by detecting the synchronization signal from the data signal included in the reflection light signal that is obtained from the optical head  103 , while the detection of the sector top position at recording is carried out by detecting the synchronization signal from the data signal which is outputted from the modulation/demodulation signal  104 .  
      The recording position deviation correction and control section  114  is constituted by, for example, a combination of a microcomputer and a program, and it detects the recording position deviation amount from the physical address position that is detected by performing an interpolation by the physical address position interpolation section using the physical address position before performing an additional recording processing that is stored in the physical address position storing section, at carrying out the additional recording processing continuously to the data region at which recording is already performed on the optical disc  100 , and the sector top address that is detected at the sector top position detection section. Then, a signal indicating the recording deviation amount or a signal indicating the correction amount at the recording position deviation correction section  115  is generated as a signal indicating that the recording position deviation correction is to be carried out on the basis of the detected recording position deviation amount, and is outputted to the recording position deviation correction section  115 .  
      The recording position deviation correction section  115  carries out recording position deviation correction so that the recording position deviation amount becomes zero on the basis of the signal outputted from the recording position correction and control section  114 . As a measure for correcting the recording position deviation, there is, for example, a method of performing correction by compressing/expanding the synchronous signal included in the recorded data.  
      Next, an algorism for calculating a recording position deviation correction amount by the recording position deviation correction and control section  114  according to a first embodiment of the present invention will be described.  
       FIG. 3  is a flowchart illustrating a recording position deviation correction amount calculation algorism by the recording position deviation correction and control section  114  according to the first embodiment of the present invention. The present algorism is repeatedly carried out for each sector of the recording or reproduced data in the recording and reproduction processing. 
          (Step S 101 ) First of all, the recording position deviation correction and control section  114  judges as to whether the recording processing under execution is an additional recording processing which carries out recording continuously to the data region where recording was already performed on the optical disc or not. Here, when the processing is not an additional recording processing, that is, it is an initial recording processing against the optical disc  100 , no recording position deviation correction processing is performed.     (Step S 102 ) Next, when the recording processing under execution is an additional recording processing, the recording position deviation correction and control section  114  judges whether it is immediately after the start of the additional recording processing or not. Particularly, the judgment as to whether it is immediately after the additional recording processing is started or not is conducted depending on whether the present processing is within N (N: an integer) sectors from the start point of the additional recording processing or not. The value N is set to an appropriate value for each execution. When it was immediately after the start of the additional recording processing as a result of judgment, it goes to step S 103 , while when it is not, it goes to step S 104 .     (Step S 103 ) When it is judged as immediately after the additional recording processing as a result of the judgment in step S 102 , an interpolation processing is carried out by the physical address position interpolation section  112 , to obtain the detected physical address. Here, as the physical address position information that is required in carrying out an interpolation processing by the physical address position interpolation section  112 , a physical address position information that is detected before starting the additional recording processing, which is stored in the physical address position storing section  110  is employed. This is because since the obtaining of the physical address before executing the additional recording processing is a reproduction processing that is conducted with a constant laser intensity, it is possible to detect a physical address of a high reliability. By carrying out an interpolation processing from such a high reliability physical address before carrying out an additional recording processing, it is also possible to obtain a high reliability physical address even during performing the additional recording processing. Further, as the physical address position information before carrying out the additional recording processing, the physical address position information before carrying out the additional recording processing which is obtained at a position closest to the end of the recorded region among the physical address position information which are stored in the physical address position storing section  110  is adopted, in order to carry out an interpolation processing with as higher precision as possible.     (Step S 104 ) On the other hand, when it is judges as it is not immediately after the start of the additional recording processing as a result of judgment in step S 102 , a physical address position corresponding to the present processing is obtained from the physical address position detection section  109  as in the prior art. Here, when it failed in acquiring the physical address position in the physical address position detection section  109  in the present step, the physical address position that is required in the present processing is obtained by performing an interpolation by the address position interpolation section  112  on the basis of the physical address position information that is closest to the present processing region among the physical address position information stored in the physical address position storing section  110  (including those under subjected to the additional recording processing).     (Step S 105 ) Further, in step S 105 , the sector top position information is obtained from the sector top position detection section  113 .     (Step S 106 ) Next, the recording position deviation correction and control section  114  calculates the recording position deviation amount from the obtained physical address position information and the sector top position information. The recording position deviation amount is calculated by comparing the sector top position indicating the recording position in the present state and the physical address position serving as a reference in recording data into an optical disc  100 , and then, it goes to step S 107 .     (Step S 107 , S 108 ) It is judged as to whether the recording position is retarded with relative to the allowable amount of the recording position deviation amount on the basis of the recording position deviation amount that is calculated in step S 106 , and when the recording position is retarded with relative to the allowable amount, an instruction for correcting the recoding sector to be contracted so that the recording position deviation amount is gone, is issued to the recording position correcting section  115 . Particularly, an instruction such as for making the synchronization signal contracted is thought of. Further, when the recording position is not delayed with relative to the allowable amount, it goes to step S 109 .     (Step S 109 , S 110 ) In step S 109 , it is judged as to whether the recording position is positioned front with relative to the allowable amount of the recording position deviation amount on the basis of the recording position deviation amount calculated in step S 106 , and when the recording position is positioned front with relative to the allowable amount, it instructs the recording position deviation correction section  115  to perform correction to extend the recording sector so that the recording position deviation amount is gone. Particularly, such as an instruction for extending the synchronization signal is thought of.     (Step S 111 ) Further, when the recording position deviation is within the allowable range, a signal indicating that the recording position deviation correction is not to be performed is outputted to the recording position deviation correction section  115 .        
      As described above, the recording position deviation correction apparatus of the first embodiment of the present invention performs an interpolation processing on the basis of the high reliability physical address that is detected before executing the additional recording processing, without detecting the physical address from an optical disc, at carrying out the additional recording processing which carries out recording of data continuously to the data region where the recording is already performed on an optical disc, to detect the physical address position during the additional recording processing, and therefore, it is possible to obtain a high reliability physical address position, and it is possible to carry out a high quality recording position deviation correction.  
      Besides, while in the recording position deviation correction apparatus according to the first embodiment, the physical address position interval is detected by detecting the period number for each physical address position interval of the wobble signals in the physical address position interval measuring section  111 , the physical address position interval measuring section  111  may be provided with a timer section  116 , and the physical address position interval may be measured by using the timer section  116  as shown in  FIG. 4 . Particularly, since the distant interval between the physical addresses is known, the physical address position interval measuring section  111  may measure the detection intervals between the physical address positions may be measured using the timer section  116  on the basis of rotation speed information of the optical disc  100  that is obtained from the spindle motor  102 .  
     Embodiment 2  
      The recording position deviation correcting apparatus according to a second embodiment of the present invention functions to perform recording position deviation correction in the additional recording processing on the basis of the recording position deviation amount at the final sector in the recorded region that is calculated from the physical address position in the reproduction processing immediately before the additional recording processing and the sector top position corresponding thereto, at carrying out the additional recording processing which carries out recording of data continuously to the data region where the recording is already performed on an optical disc  100 . The content thereof will be described with reference to  FIGS. 5 and 6 .  
       FIG. 5  is a diagram illustrating a whole construction of an optical disc apparatus according to the second embodiment of the present invention.  
      In  FIG. 5 , the optical disc apparatus of the second embodiment of the present invention includes a recording position deviation correction apparatus  201 , a spindle motor  102 , an optical head  103 , a modulation/demodulation section  104 , an error correction/addition section  105 , a data buffer section  106 , a host interface section  107 , and a host  108 . The components in the optical disc apparatus of this second embodiment similar to those in the optical disc apparatus of the first embodiment are denoted by the same reference numerals and the descriptions are omitted here.  
      The recording position deviation correction apparatus  201  corrects the recording position deviation in the continuing portion connecting the recorded region and the region where the additional recording processing is to be performed, on the basis of the position deviation amount between the SYNC position of the final sector in the recorded region and the corresponding physical address position, at carrying out an additional recording processing which carries out recording continuously to the data region where recording is already performed on the optical disc  100 . Here, since the measurement of the position deviation amount in the recorded region can be carried out in the reproduction processing in which a laser light of a constant intensity is irradiated, it is possible to carry out detection of a high reliability physical address position and measurement of recording position deviation amount.  
      Hereinafter, the recording position deviation correction apparatus  201  will be described in detail.  
      The recording position deviation correction apparatus  201  includes the physical address position detection section  109 , the physical address position storing section  110 , the sector top position detection section  113 , the recording position deviation correction section  115 , the sector top position storing position  202 , and the recording position deviation correction and control section  203 . Here, the components in the recording position deviation correction apparatus  201  according to this second embodiment which are similar to those in the recording position deviation correction apparatus in the first embodiment are denoted by the same reference numerals and descriptions are omitted here.  
      The sector top position storing section  202  stores the sector top position which is detected by the sector top position detecting section  113 .  
      The recording position deviation correction and control section  203  is constituted by a combination of such as a microcomputer and a program, and it detects the recording position deviation amount at the final sector in the recorded region from the physical address position immediately before the additional recording processing which is stored in the physical address position storing section  110  and the sector top position immediately before the additional recording processing which is stored in the sector top position storing section  202  at carrying out the additional recording processing which carries out recording continuously to the data region where the recording is already performed on the optical disc  100 . Then, as a signal indicating to perform a recording position deviation correction on the basis of the detected recording position deviation amount, such as a signal indicating a recording position deviation amount or a correction amount at the recording position deviation correction section  115  is generated to be outputted to the recording position correction section  115 .  
      Next, an algorism for calculating the recording position deviation correction amount by the recording position deviation correction control section  203  in the second embodiment of the present invention will be described with reference to  FIG. 6 .  
       FIG. 6  is a flowchart for explaining an algorism for calculating the recording position deviation correction amount in the recording position deviation correction control section  203  according to the second embodiment of the present invention. Here, the present algorism is carried out for each sector in the recording and reproduction processing. 
          (Step S 201 ) First of all, the recording position deviation correction control section  203  judges as to where the recording processing under execution is an additional recording processing which carries out recording continuously to the data region where recording is already performed on an optical disc is not. When the processing is not an additional recording processing, i.e., it is an initial recording processing to be performed onto the optical disc  100 , no recording position deviation correction processing is carried out.     (Step S 202 ) Next, when the recording processing under execution is an additional recording processing, it is judged as to whether it is a start timing of the additional recording processing or not, and when it is the start timing of the additional recording processing, it goes to step S 203 , while when it is not a start timing, it goes to step S 205 .     (Step S 203 ) Then, when the recording processing is at the start timing of the additional recording processing, as a physical address position information that is required for measuring the recording position deviation amount, the physical address position information that is detected immediately before the additional recording processing that is stored in the physical address position storing section  110  is obtained. On the other hand, when the recording processing is not at the start timing of the additional recording processing, it goes to step S 206 .        
      Besides, in the present embodiment, descriptions are given on an assumption that the physical address position immediately before the additional recording processing is stored in the physical address position storing section  110 . However, by previously providing the physical address position interval measuring section  111  and the physical address position interpolation section  112  as described in the first embodiment using  FIG. 1  in the recording position deviation correction apparatus, it is also possible to correspond to even a case where the physical address position immediately before the additional recording processing is not stored in the physical address position storing section  110  (caused by such as no detection). This is because it is possible to obtain the physical address position immediately before the additional recording processing by interpolating the physical addresses immediately before the additional recording processing on the basis of the physical address position information which is already stored in the physical address position storing section  110  by the physical address position interpolation section  112  when the physical address position immediately before the additional recording processing is not stored in the physical address position storing section  110 . 
          (Step S 204 ) Next, the sector top position corresponding to the physical address position that is obtained in the step S 203  is obtained from the sector top position detection section  113 .     (Step S 205 ) Then, the recording position deviation correction and control section  203  calculates the recording position deviation amount A on the basis of the physical address position that is obtained in step S 203  and the sector top position information that is obtained in step S 204 , and completes the processing.        

      Besides, in the present algorism, the recording deviation amount is calculated by the comparison between the physical address position and the sector top position only at a sector timing at starting the additional recording processing, and at subsequent timings for each sector in the additional recording processing, the processing of steps S 206  to S 212  are carried out on the basis of the recording position deviation amount A that is calculated in step S 205 . 
          (Step S 206  to Step S 208 ) When it is judged, as the result of judgment in step S 205 , the recording processing is not at the start timing of the additional recording processing, it is first judged as to whether the recording position deviation amount A that is calculated in step S 205  is in a retarded direction or not, and when it is in the retarded direction, an instruction is issued for carrying out a correction for shortening the recording sector so that the recording position deviation amount is gone to the recording position deviation correction section  115 . Here, such as an instruction for shortening the synchronization signal is thought of. Then, the recording position deviation amount A is modified in a fast direction by the amount corresponding to the correction processing, and the processing is completed. Further, when the recording position deviation amount A is not in the retarded direction, it goes to step S 209 .     (Step S 209  to Step S 211 ) Next, in step S 210 , it is judged whether the recording deviation amount A which is calculated in step S 205  is a faster direction or not, and when it is in a faster direction, an instruction indicating make a correction for extending the recording sector so that the recording position deviation amount is gone is issued. More particularly, such as an instruction for extending the synchronization signal is thought of. Then, the recording position deviation amount A is modified to the retarding direction by the amount corresponding to the correction processing to be renewed, and completes the processing.     (Step S 212 ) Further, when the recording position deviation A is zero, the recording position deviation correction is not carried out, and the recording correction amount  0  is outputted to the recording position deviation correction section  115 .        

      As described above, the recording position deviation correction apparatus of the second embodiment of the present invention detects the recording position deviation amount at the final sector in the recorded region from the physical address position in the reproduction processing immediately before the additional recording processing and the sector top position corresponding thereto, without detecting the physical address position from the disc, at carrying out an additional recording processing which carries out recording continuously to the data region where the recording is already carried out on an optical disc, and carries out a recording position deviation correction on the basis if the detected recording position deviation amount immediately before the additional recording processing, thereby enabling detecting the recording position deviation amount at the final sector in the recorded region having a high reliability using the physical address that is detected in the reproduction processing immediately before the additional recording processing, whereby it is made possible to carry out a high quality recording position deviation correction with utilizing that the recording position deviation amount at the final sector in the recorded region and the position deviation amount which is to be corrected in the additional recording processing are approximately equal to each other.  
     Embodiment 3  
      Next, a recording position deviation correction apparatus according to a third embodiment of the present invention additionally includes a laser control section  302  in the recording position deviation correction apparatus of the second embodiment, and it enables enhancing reliability in detection of the physical address position in the reproduction processing immediately before the additional recording processing.  
       FIG. 7  is a block diagram illustrating the whole construction of the optical disc apparatus of the third embodiment.  
      In  FIG. 7 , the optical disc apparatus of the third embodiment of the present invention includes a recording position deviation correction apparatus  301 , a spindle motor  102 , an optical head  103 , a modulation/demodulation section  104 , an error correction/addition section  105 , a data buffer section  106 , a host interface section  107 , and a host  108 , and the recording position deviation correction apparatus  301  is constituted by a physical address position detection section  109 , a physical address position storing section  110 , a physical address position interval measuring section  111 , a physical address position interpolation section  112 , a sector top position detection section  113 , a recording position deviation correction section  115 , a laser control section  302 , and a recording position deviation correction section  203 . Besides, the components in the optical disc apparatus of this third embodiment similar to those in the optical disc apparatus of the first and the second embodiment are denoted by the same reference numerals and descriptions are omitted here.  
      The laser control section  302  included in the recording position correction apparatus  301  controls the laser output that is irradiated by the optical head  103 , and controls the laser output irradiated by the optical head  103  so that data having a high physical address detection probability at reproduction is compulsorily recorded irregardless of the data to be recorded at the physical address detection timing at the final sector in the recording processing range. Here, generally, a space which has a high probability in detecting the physical address position at the reproduction processing is adopted to be recorded.  
      Besides, in this system, the adjustment of the laser power in the general recording and reproduction operation is carried out by the optical head  103 .  
      Further, in the recording position deviation correcting apparatus  301  according to the third embodiment of the present invention, since a laser light of a constant intensity is compulsorily irradiated at a physical address detecting timing at the final sector in the recording processing range, a laser light of an intensity which does not correspond to the recorded data is irradiated onto an optical disc at a timing of detecting the physical address, thereby there may arise a possibility that an error data is included in the recorded data. However, an error correction processing which performs detection and correction of error data against the read out data is generally carried out. Therefore, even when a laser light of an intensity which does not correspond to the recorded data is irradiated at a physical address detection timing, it is possible to reproduce data that is equivalent to the recorded data by the way of the error correction function.  
      Next, the laser control algorism employed by the laser control section  302  in the third embodiment of the present invention will be described with reference to  FIG. 8 .  
       FIG. 8  is a flowchart for explaining the laser control algorism employed by the laser control section  302  in the third embodiment of the present invention. Here, the present algorism is always operating in the recording, and a series of operations from step S 301  to step S 304  are repeatedly carried out. 
          (Step S 301 ) First of all, the laser control section  302  judges whether the present processing timing is a timing for detecting the physical address in the recording processing or not. Besides, the physical address detection timing can be known by interpolating the prior physical address positions using the physical address position information which are detected in the past and stored in the physical address position storing section  110  by the physical address position interpolation section  112 .        
      Then, when it is judged as a physical address position detection timing, it goes to step S 302 , and when it is not the physical address position detection timing, no processing is performed, and the algorism is concluded. 
          (Step S 302 ) Next, the laser control section  302  judges whether the present recording processing region is at the end of the recording processing range or not. More concretely, it is judged whether the present recording processing region is at the end of the recording processing region or not depending on whether the present processing region is within N (N: a positive integer) sectors from the final sector. Here, the value N can be arbitrarily set and it is set to an appropriate value in accordance with the specifications of the apparatus and the like.        

      When it is judged as the present recording processing region is at an end region, it goes to step S 303 , and when the present recording processing region is not at the end region, no processing is performed, and the algorism is completed. 
          (Steps S 303 , S 304 ) Next, the laser control section  302  judges whether the object which is to be recorded into the optical disc  100  is a SYNC (synchronous signal) or not at the physical address detection timing.        

      When it is judges as not a SYNC signal, the laser control section  302  controls the optical head  103  so that a space is compulsorily recorded at the physical address detection timing. On the other hand, when it is judged as a SYNC (synchronous signal), no processing is performed, and the algorism is concluded.  
      As described above, according to the recording position deviation correction apparatus of the third embodiment of the present invention, a space which has a high physical address detection probability at the reproduction is recorded at the end region of the recording processing range by the laser control section  302 , and thereby, the reliability in the physical address position detection in the reproduction processing immediately before the additional recording processing is enhanced.  
      Further, this apparatus enables detecting a correct recording position deviation amount at the final sector in the recorded region from the physical address position in the reproduction processing immediately before the additional recording processing and the sector top position corresponding thereto at carrying out the additional recording processing which carries out recording continuously to the data region where the recording s already performed on an optical disc, and thereby, it becomes possible to carry out a higher quality recording position deviation correction by the recording position deviation correction apparatus of the present invention.  
     Embodiment 4  
      Next, a recording position deviation correction apparatus according to a fourth embodiment of the present invention includes a laser control section  402  which compulsorily irradiate the laser of an intensity that produces a high physical address detection probability at the physical address detection timing during the recording processing, and thereby makes it possible to enhance the reliability in detection of the physical address position during the recording processing.  
       FIG. 9  is a block diagram illustrating a whole construction of an optical disc apparatus according to the fourth embodiment of the present invention.  
      In  FIG. 9 , the optical disc apparatus of the fourth embodiment of the present invention includes a recording position deviation correction apparatus  401 , a spindle motor  102 , an optical head  103 , a modulation/de-modulation section  104 , an error correction/addition section  105 , a data buffer section  106 , a host interface section  107 , and a host  108 . Here, the components similar to those in the first embodiment described above are assigned with the same numerals and descriptions are omitted here.  
      The recording position deviation correction apparatus  401  functions to compulsorily irradiate a laser of constant intensity at a detection timing of a physical address during the recording processing so that the level of the physical address signal may be constant, thereby to enhance the reliability in the physical address position detection in the recording processing, and then carries out a recording position correction from the detected physical address position and the sector top position of the recording and reproduction data. data.  
      In the recording position deviation correction apparatus  401  of the fourth embodiment of the present invention, since the laser of a constant intensity is compulsorily irradiated at the detection timing of the physical address during the recording processing, the laser of intensity which does not correspond to the recorded data would be irradiated to the optical disc at the detection timing of the physical address, thereby resulting in a possibility that error data are included in the recorded data. However, in the reproduction processing for reading out data in a disc, an error correction processing which carries out the detection and correction of error data is generally carried out to the data read out. Therefore, even when a laser of an intensity which does not correspond to the recorded data is irradiated at the timing of detecting the physical address, it is possible to reproduce data that is equivalent to the recorded data by the way of the error correction function.  
      Hereinafter, the recording position deviation correction apparatus  401  will be described in detail.  
      The recording position deviation correction apparatus  401  includes a physical address position detecting section  109 , a physical address position storing section  110 , a physical address position interval measuring section  111 , a physical address interpolation section  112 , a sector top position detecting section  113 , a recording position deviation correcting section  115 , a laser control section  402 , and a recording position deviation correction and control section  403 . Besides, in the recording position deviation correcting apparatus  401  of this fourth embodiment, the components similar to those in the recording position deviation correction apparatus  101  of the first embodiment are assigned with the same numerals and descriptions are omitted here.  
      The laser control section  402  functions to control the output of the laser which is irradiated by the optical head  103  and control the laser which is irradiated by the optical head  103  so that a laser having a high physical address detection probability is compulsorily irradiated irregardless of the recorded data at the detection timing of a physical address during the recording processing. Here, since the laser intensity at mark recording is generally stronger than that at the space recording in a disc recording processing, and the physical address signal level is also higher at mark recording accompanying therewith, it is controlled so that the laser control section  402  record marks at the detection timing of a physical address during the recording processing.  
      In the present system, the laser power adjustment in the general recording and reproduction operation is carried out by the optical head  103 .  
      Further, the recording position deviation correction control section  403  is constituted, for example, by a combination of a microcomputer and a program, and it detects the recording position deviation amount from the physical address which is detected by the physical address position detecting section  109  from the light reflected from the laser light that is controlled by the laser control section  402 , and the sector top position which is detected by the sector top position detection section  103 . Then, as a signal indicating conducting recording position deviation correction on the basis of the detected recording position deviation amount, for example, a signal indicating the recording position correction amount, or a signal indicating a correction amount at the recording position deviation correction section  115  is generated, and is outputted to the recording position deviation section  115 .  
      Next, a laser control algorism by the laser control section  402  according to the fourth embodiment of the present invention will be described with reference to  FIG. 10 .  
       FIG. 10  shows a flowchart for exemplifying the laser control algorism employed by the laser control section  402  in the fourth embodiment of the present invention. Besides, the present algorism is always operating in the recording, and a series of operations from step S 401  to step S 404  are repeatedly carried out. 
          (Step S 401 ) First of all, the laser control section  402  judges whether the present processing timing is a timing for detecting the physical address in the recording processing or not. Besides, the physical address detection timing can be known by interpolating the prior physical address positions using the physical address position information which are detected in the past and stored in the physical address position storing section  110  by the physical address position interpolation section  112 .        
      Then, when it is judged as a physical address position detection timing, it goes to step S 402 , and when it is not the physical address position detection timing, no processing is performed, and the algorism is concluded. 
          (Steps S 402 , S 403 ) Next, the laser control section  402  judges whether the data which is to be recorded in an optical disc  100  is a SYNC (synchronous signal) or not at the physical address detection timing.        

      When it is judged as not a SYNC (synchronous signal), the laser control section  302  controls the optical head  103  so that marks are compulsorily recorded at the physical address detection timing. When it is judged as a SYNC (synchronous signal), no processing is performed, and the algorism is concluded.  
      As described above, according to the fourth embodiment of the present invention, a laser light having an intensity having a high physical address detection probability is compulsorily irradiated at the physical address detection timing during the recording processing, and thereby, the reliability of physical address position detection during the recording processing by the physical address position detection section  109  is enhanced, and a high quality recording position deviation correction can be carried out.  
     Embodiment 5  
      A recording position deviation correcting apparatus according to a fifth embodiment of the present invention includes a physical address obtaining optical head which irradiates a laser light of a constant power which do not give any influences to the recording processing prior to the recording processing, and detects the physical address position using a reflection light which is received by the physical address obtaining optical head, thereby to detect a high reliability physical address position. By irradiating a laser of a constant intensity, a high reliability physical address position is detected.  
       FIG. 11  is a block diagram showing a whole construction of an optical disc apparatus according to a fifth embodiment of the present invention.  
      In  FIG. 11 , the optical disc apparatus according to the fifth embodiment of the present invention includes a recording position deviation correction apparatus  501 , a spindle motor  102 , an optical head  103 , a modulation/de-modulation section  104 , an error correction/addition section  105 , a data buffer section  106 , a host interface section  107 , and a host  108 . Besides, in the optical disc apparatus of this fifth embodiment, the components similar to those in the optical disc apparatus of the first embodiment described above, are assigned with the same reference numerals and descriptions are omitted here.  
      The recording position deviation correcting apparatus  501  functions to irradiate a laser light of a constant intensity prior to the recording processing, so as to make the level of the detected physical address signal constant thereby to increase the reliability in the physical address position detection, and then carries out the recording position deviation correction in the additional recording processing from the detected physical address position and the sector top position of the recording and reproduction data.  
      Hereinafter, the recording position deviation correction apparatus  501  will be described in detail.  
      The recording position deviation correction apparatus  501  includes a physical address position detection section  109 , a sector top position detection section  113 , a physical address obtaining optical head  502 , a recording position deviation correction and control section  503 , and a recording position deviation correction section  115 . Besides, in the recording position deviation correction apparatus  501  of the fifth embodiment of the present invention, the components similar to those in the recording position deviation correction apparatus  101  are assigned with the same reference numerals and descriptions are omitted here.  
      The physical address obtaining optical head  502  always irradiates a laser power for reproduction in both processing of recording and reproduction, and receives the reflected light. This block is mainly used for detecting the physical address position. Besides, the region where the physical address obtaining optical head  502  irradiates the laser light to the optical disc  100 , is a region in front to the region where the laser is irradiated to the optical disc  100  by the optical head  103 . Thereby, when the physical address is employed in a processing concerning the optical head  103 , it is possible to utilize the physical address position which is obtained from the physical address obtaining optical head  502 .  
      The recording position deviation correcting control section  503  is constituted by, for example, a combination of a microcomputer and a program, and it detects the recording position deviation amount from the physical address position that is detected by the physical address position detecting section  109  and the sector top position information that is detected by the sector top position detection section  113  both on the basis of the reflected light which is received by the physical address obtaining optical head  502  at carrying out the additional recording processing which carries out recording continuously to the data region where the recording is already performed on the optical disc  100 . Then, as a signal indicating conducting recording position deviation correction on the basis of the detected recording position deviation amount, for example, a signal indicating the recording position deviation amount, or a signal indicating the correction amount at the recording position deviation correction section  115  is generated to be outputted to the recording position deviation correction section  115 .  
      By such a construction, the physical address position detection circuit  109  can detect the physical address position using the reflection light obtained from the laser of a constant power, which is detected by the physical address obtaining optical head  502 , and the recording position deviation correction control section  503  calculates the physical address deviation amount using the physical address position having a high reliability that is detected by the physical address position detection section  109  and the sector top position information that is detected by the sector top position detection section  113 , and controls the recording position deviation correction section  115  so that the recording position deviation amount is gone.  
      As described above, according to the recording position deviation correction apparatus of the fifth embodiment of the present invention, there is provided a physical address obtaining optical head  502  which irradiates a laser power of a constant intensity, and the detection of the physical address position is carried out by only using a laser power of a constant intensity, thereby the detection of the physical address position can be carried out in a stationary state and a high reliability physical address position can be obtained, resulting in a high quality recording position deviation correction.  
      In the above-described fifth embodiment, a construction in which the physical address obtaining optical head  502  irradiates a laser power for reproduction is described. However, the laser power irradiated by the physical address obtaining optical head  502  is not limited thereto, and a laser power which does not give any influences on unrecorded regions on the recording medium may be employed.  
      In the respective embodiments of the present invention, the processing which are carried out by the recording position deviation correction apparatus and are explained with referring to the flowcharts shown in  FIGS. 3, 6 ,  8 , and  10  can be implemented by reciting the procedures described in the respective embodiments of the present invention in a program and making such as a central processing unit (CPU) of a personal computer execute the program. Further, such a program itself may be stored in various recording medium such as a semiconductor memory apparatus, or may be transmitted through a communication line such as an internet.  
     APPLICABILITY IN INDUSTRY  
      The recording position deviation correction apparatus, the recording position deviation correction method, and the recording position deviation correction program according to the present invention are effective in being capable of performing a high quality recording position deviation correction at carrying out an additional recording processsing which performs recording continuosly to the data region where the recording is already performed on an optical disc.