发明名称 |
Variable focal length photo-taking optical system |
摘要 |
A variable focal length photo-taking optical system includes a photo-taking objective lens, and a conversion lens removably added to the photo-taking objective lens and relatively movable along the optic axis with at least some lens groups of the photo-taking objective lens to change the combined focal length of the photo-taking objective lens and the conversion lens.
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申请公布号 |
US5050971(A) |
申请公布日期 |
1991.09.24 |
申请号 |
US19890405678 |
申请日期 |
1989.08.23 |
申请人 |
NIKON CORPORATION |
发明人 |
SATO, SUSUMU;WAKAMIYA, KOICHI;OHSHITA, KOICHI |
分类号 |
G02B15/10;G02B15/16;G02B15/173 |
主分类号 |
G02B15/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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