发明授权
- 专利标题： Rear conversion lens
- 专利标题（中）： 后转换镜头
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申请号： US750699申请日： 1985-06-28
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公开(公告)号： US4643536A公开(公告)日： 1987-02-17
- 发明人: Yasuyuki Yamada , Yasuhisa Sato , Hiroki Nakayama , Kouji Oizumi
- 申请人： Yasuyuki Yamada , Yasuhisa Sato , Hiroki Nakayama , Kouji Oizumi
- 申请人地址： JPX Tokyo
- 专利权人： Canon Kabushiki Kaisha
- 当前专利权人： Canon Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX59-137021 19840702
- 主分类号： G02B15/12
- IPC分类号： G02B15/12 ; G02B15/02 ; G02B9/12
摘要：
A conversion lens upon attachment on the image side of a master lens increases the focal length of the entire system. The conversion lens comprises three components of negative, positive and negative powers in this order from the front, has a negative power as a whole, and satisfies the following conditions:2.0 0.15where fi and ni are the focal length and the refractive index of the glass of the i-th component counting from the front respectively.
公开/授权文献
- US5763438A 2-acylaminopropanol compound and medical composition 公开/授权日：1998-06-09