Laser beam recorder and method for controlling a laser beam recorder

Abstract

The present invention relates to a method for controlling a LBR (Laser Beam Recorder) ( 56 ) suitable for mastering a record carrier ( 60 ) by writing data in the record carrier in circular or spiral tracks and comprising: means ( 58 ) for rotating a record carrier; means ( 62 ) for moving a laser ( 61 ) over the record carrier ( 60 ) in a radial direction with reference to the rotation of the record carrier ( 60 ); means ( 65 ) for controlling the laser output power; and means ( 66 ) for synchronizing the rotation of the record carrier ( 60 ), the movement of the laser ( 61 ) and the laser output power. In accordance with the invention synchronizing the rotation of the record carrier 60; the movement of the laser 61 and the laser output power is performed such that at least a part of the data is written in at least one track comprising a different arrangement than circular or spiral. The present invention also relates to a Laser Beam Recorder.

1 . A method for controlling a LBR (Laser Beam Recorder) ( 56 ) suitable for mastering a record carrier ( 60 ;  210 ) by writing data ( 54 ) in the record carrier ( 60 ;  210 ) in circular or spiral tracks and comprising:
 means ( 58 ) for rotating a record carrier ( 60 ;  210 );   means ( 62 ) for moving a laser over the record carrier ( 60 ;  210 ) in a radial direction with reference to the rotation of the record carrier ( 60 ;  210 );   means for ( 65 ) controlling the laser output power; and   means ( 66 ) for synchronizing the rotation of the record carrier ( 60 ;  210 ), the movement of the laser ( 61 ) and the laser output power;   the method being characterized by the following step:   synchronizing the rotation of the record carrier ( 60 ;  210 ), the movement of the laser ( 61 ) and the laser output power such that at least a part of the data ( 54 ) is written in at least one track ( 10 - 42 ) comprising a different arrangement than circular or spiral.   
   
   
       2 . The method according to  claim 1 , characterized in that for writing the part of the data ( 54 ) a mapping between Cartesian coordinates (x, y) and polar coordinates (R, θ) is performed. 
   
   
       3 . The method according to  claim 1 , characterized in that the at least one track ( 10 - 42 ) comprises an arrangement of a straight line. 
   
   
       4 . The method according to  claim 1 , characterized in that the part of said data ( 54 ) is provided in the form of pits ( 44 - 52 ). 
   
   
       5 . The method according to  claim 4 , characterized in that the pits are located at intersections of virtual lines ( 76 ) lying in the plane of the record carrier ( 60 ) and virtual columns ( 78 ) lying in the plane of the record carrier ( 60 ). 
   
   
       6 . The method according to  claim 4 , characterized in that at least some of the pits ( 49 ) overlap. 
   
   
       7 . The method according to  claim 4 , characterized in that at least some of the pits ( 51 ), ( 52 ), ( 53 ) have different depths. 
   
   
       8 . The method according to  claim 1 , characterized in that at least part of said data ( 54 ) is provided in the form of pits ( 51 ,  52 ;  53 ) having different depths, wherein the record carrier ( 60 ;  210 ) comprises a first recording layer ( 212 ) and at least a second recording layer ( 214 ) between which there is provided a physical barrier ( 216 ) leading to discrete pit depths. 
   
   
       9 . The method according to  claim 1 , characterized in that the part of data ( 54 ) is written in the form of a straight line ( 22 - 28 ) comprising local broadenings ( 48 ). 
   
   
       10 . The method according to  claim 1 , characterized in that the part of data is written in the form of a straight line ( 14 - 20 ) comprising local necks ( 46 ). 
   
   
       11 . The method according to  claim 1 , characterized in that the record carrier ( 60 ;  210 ) is intended to be used in connection with the creation of a stamper ( 300 ). 
   
   
       12 . The method according to  claim 11 , characterized in that the stamper ( 300 ) is intended to be used for producing (optical) data carriers which are intended to be readout without being rotated. 
   
   
       13 . The method according to  claim 11 , characterized in that the stamper ( 300 ) is intended to be used for printing, especially for micro-contact printing. 
   
   
       14 . The method according to  claim 1 , characterized in that the track is a meta-track ( 36 ;  42 ) comprising a two dimensional data layout. 
   
   
       15 . A LBR (Laser Beam Recorder) ( 56 ) suitable for mastering a record carrier ( 60 ); ( 110 ;  210 ) by writing data ( 54 ) in the record carrier ( 60 ;  210 ) in circular or spiral tracks and comprising:
 means ( 58 ) for rotating a record carrier ( 60 ;  210 );   means ( 62 ) for moving a laser ( 61 ) over the record carrier ( 60 ;  210 ) in a radial direction with reference to the rotation of the record carrier ( 60 ;  210 );   means ( 65 ) for controlling the laser output power; and   means ( 66 ) for synchronizing the rotation of the record carrier ( 60 ;  210 ), the movement of the laser ( 61 ) and the laser output power;   characterized in that the means ( 66 ) for synchronizing the rotation of the record carrier ( 60 ;  110 ;  210 ), the movement of the laser ( 61 ) and the laser output power are adapted to perform synchronization such that at least a part of the data ( 54 ) is written in at least one track ( 10 - 42 ) comprising a different arrangement than circular or spiral.   
   
   
       16 . A LBR ( 56 ) according to  claim 15 , characterized in that the means ( 66 ) for synchronization are adapted to perform a mapping between Cartesian coordinates (x, y) and polar coordinates (R, θ).