| 摘要 |
An optical data reading/writing device for reading/writing to an information layer, the device comprising at least a first radiation source ( 12 ) for generating a radiation beam and an optical system ( 10, 40, 44, 46, 48, 50, 52, 54, 56 ) for converging the radiation beam on the information layer and for converging the radiation beam reflected by the information layer onto a detector, wherein the optical system incorporates a wavelength sensitive structure which compensates for a temperature-induced defocusing of the optical system.
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