发明授权
- 专利标题： Optical system for recording and reproducing for use in optical information recording medium
- 专利标题（中）： 光学信息记录介质中用于记录和再现的光学系统
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申请号： US333888申请日： 1999-06-15
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公开(公告)号： US6049519A公开(公告)日： 2000-04-11
- 发明人: Norikazu Arai , Masaya Kobayashi , Hiroyuki Yamazaki , Hiroshi Kibayashi
- 申请人： Norikazu Arai , Masaya Kobayashi , Hiroyuki Yamazaki , Hiroshi Kibayashi
- 申请人地址： JPX Tokyo
- 专利权人： Konica Corporation
- 当前专利权人： Konica Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX7-308565 19951102; JPX7-309189 19951128; JPX7-352208 19951228
- 主分类号： G02B13/24
- IPC分类号： G02B13/24 ; G11B7/00 ; G11B7/135
摘要：
An optical system for recording or reproducing of information to or from an optical information recording medium, includes a light source, a coupling lens for converting a diverging light emergent from the light source to a converging light, and an objective lens for further converging the converted converging light and for focusing on an information recording surface of the optical information recording medium. A lateral magnification M.sub.c of the coupling lens on an image side for a light source side and a numerical aperture NA.sub.o on the light source side of the coupling lens satisfy the following expressions respectively, -7.0.ltoreq.M.sub.c .ltoreq.-0.5 and 0.06.ltoreq.NA.sub.o .ltoreq.0.21.
公开/授权文献
- US5455209A Lead-free ceramic insulator 公开/授权日：1995-10-03
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