| 摘要 |
In an optical scanning device for scanning both a high-density, HD, record carrier (18) and a low-density, LD, record carrier (38), wherein a beam vergence-changing lens (34; 55) is arranged in the path of at least one of the LD (32) and HD beams (2) to adapt the vergence of the beam so that it has the required cross-section at the pupil of a conventional lens system (10, 14), this lens is made of plastics and has a focal length of between 6 and 9 mm. The temperature dependency of the scanning device is reduced thereby.
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