发明公开
EP1209490A2 Objective lens for optical disk 审中-公开
Objektivlinsefüroptische Platte

Objective lens for optical disk
摘要:
There is disclosed an objective lens (21, 31, 41) for an optical disk, comprising a bi-aspherical single lens having a numerical aperture of 0.7 or more, wherein a center thickness of the lens is larger than a focal distance.
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