The method of controlling the laser beam recorder of the dual beam and the laser beam recorder of the dual beam

摘要

It has disclosed concerning the optical compensator which is used with the optical scanning arrangement which scans the 2nd optical recording carrier (3 ' ') which possesses information layer (2 ' ') in the 1st optical recording carrier (3 ') which possesses information layer (2 ') in 1st information layer depth and the information layer depth d2 where 2nd differs. Scan of the 1st and 2nd optical recording carrier takes effect making use of the scan spot (16) which is formed the 2nd emission beam which possesses the 1st emission beam which possesses 1st wave length and the wave length where 2nd differs with respectively in information layer. The optical compensator the 1st emission beam and has the annular territory which is arranged in route of the 2nd emission beam, it possesses circular phase structure substantially. The annular territory conforms concerning the radiation which incidence is done in the aforementioned annular territory (16) in order to give wave front irregularity to the aforementioned 1st emission beam which brings destructive interference in the territory of scan spot. Further feature of this invention regards the optical element which stipulates the numerical aperture of the emission beam. The optical compensator and the optical element are used concerning two or three wave length diameters. In addition as for this invention, it has disclosed concerning the optical scan head and the optical scanning arrangement which uses the optical compensator. In addition as for this invention, and, it regards the optical scan head and the optical scanning arrangement.