An information storage system is described comprising an optical multi-layer record carrier (1) and a device (10) for scanning the layers (3, 4, 5) with a scanning spot (15) formed by a radiation beam (12). The radiation beam is compensated for spherical aberration for a single height of the scanning spot within the stack (2) of layers. The height of the stack is determined by the maximum spherical aberration admissible for the system. The number of layers in the stack is determined by the minimum distance between layers, which depends on the crosstalk on servo errorsignals due to currently unscanned layers.
申请公布号
EP0729629(B1)
申请公布日期
2003.11.05
申请号
EP19950927046
申请日期
1995.08.16
申请人
KONINKLIJKE PHILIPS ELECTRONICS N.V.;PHILIPS NORDEN AB
发明人
COOPS, PETER;HEEMSKERK, JACOBUS, PETRUS, JOSEPHUS;VISSER, DERK;HOLTSLAG, ANTONIUS, HENDRICUS, MARIA