发明授权
US5162949A Lens for an optical disc recording and/or reproducing apparatus 失效
用于光盘记录和/或复制设备的镜头

Lens for an optical disc recording and/or reproducing apparatus
摘要:
A single focusing lens for an optical disc recording and/or reproducing apparatus, wherein the lens two aspherical surfaces, has a large numerical aperture of about 0.6, and a focal length and a thickness that satisfy following formulas0.25
公开/授权文献
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