Recording medium, recording apparatus and recording method

Abstract

Optimum movement of first and last signal pulses based on the data pattern is determined before data recording to record marks in the correct position. A specific pattern signal is read from a disc track and digitized with an appropriate slice level by the digitizing circuit ( 115 ). A pulse position offset measuring circuit ( 120 ) then measures specific edge intervals in the resulting digital signal. Movement of the first and last pulse by the pulse moving circuit ( 110 ) is then set so that the offset between the measured edge interval and a predetermined standard edge interval is ideally zero.

1 - 69 . (canceled)  
   
   
       70 . A data recording medium having a plurality of concentric or spiral tracks for recording information represented as marks and spaces between the marks, the marks being formed by emitting to a track recording surface an optical beam modulated by a plurality of drive pulses, wherein the drive pulse count is adjusted according to a length of a mark part in the original signal to be recorded to the track, said data recording medium comprising: 
 prerecorded control data, said prerecorded control data comprising: 
 timing information including at least one of first information for determining a rising edge position of a first pulse of said drive pulses, and second information for determining a trailing edge position of a last pulse of said drive pulses.  
   
   
   
       71 . A data recording medium as claimed in  claim 70 , wherein said control data further comprises information for asymmetry as one of said operational power information.  
   
   
       72 . A recording and reproducing apparatus for use in recording data to and reproducing data from a data recording medium, 
 the data recording medium having a plurality of concentric or spiral tracks for recording information represented as marks and spaces between the marks, the marks being formed by emitting to a track recording surface an optical beam modulated by a plurality of drive pulses where the drive pulse count is adjusted according to a length of a mark part in the original signal to be recorded to the track, the data recording medium comprising:    prerecorded control data, the prerecorded control data comprising: 
 timing information including at least one of first information for determining a rising edge position of a first pulse of the drive pulses, and second information for determining a trailing edge position of a last pulse of the drive pulses;  
   said recording and reproducing apparatus comprising:    a reading system that reads the timing information; and    a determining system that determines drive pulse based on the timing information.    
   
   
       73 . A recording and reproducing apparatus as claimed in  claim 72 , wherein said determining system for determining drive pulse emission power has a random signal generator for generating a random signal.  
   
   
       74 . A recording and reproducing apparatus as claimed in  claim 72 , wherein said determining system for determining drive pulse emission power has a simple pattern signal generator for generating a simple pattern signal that is a signal having a single period.  
   
   
       75 . A recording and reproducing method for use in recording data to and reproducing data from a data recording medium, 
 the data recording medium having a plurality of concentric or spiral tracks for recording information represented as marks and spaces between the marks, the marks being formed by emitting to a track recording surface an optical beam modulated by a plurality of drive pulses where the drive pulse count is adjusted according to a length of a mark part in the original signal to be recorded to the track, the data recording medium comprising:    prerecorded control data, said prerecorded control data comprising: 
 timing information including at least one of first information for determining a rising edge position of a first pulse of said drive pulses, and second information for determining a trailing edge position of a last pulse of said drive pulses; and  
   said recording and reproducing method comprising:    reading the timing information; and    determining drive pulse based on the timing information.    
   
   
       76 . A recording and reproducing method as claimed in  claim 75 , wherein said determining includes generating a random signal.  
   
   
       77 . A recording and reproducing method as claimed in  claim 75 , wherein said determining includes generating a simple pattern signal that is a signal having a single period.