发明授权
US07778139B2 Optical information recording/reproducing device and objective lens for the same 失效
光信息记录/再现装置和物镜相同

Optical information recording/reproducing device and objective lens for the same
摘要:
There is provided an objective lens used for an optical information recording/reproducing device for recording information to and/or reproducing information from two types of optical discs, by selectively using one of two types of substantially collimated light beams including first and second light beams. When wavelengths of the first and second light beams are respectively represented by λ1 (nm) and λ2 (nm), λ1
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