专利内容由知识产权出版社提供
专利名称：Zoom magnifier发明人：Tetsuya Abe申请号：US09/181330申请日：19981028公开号：US06124985A公开日：20000926
摘要：A zoom magnifier is composed of a positive first lens group, a negative secondlens group, a positive third lens group, in this order from the eye side, wherein zooming isperformed by moving the second lens group in the optical axis direction, and wherein thezoom magnifier satisfies the following condition:
30 mm < f.sub.I (1)
wherein
f.sub.I designates the focal length of the first lens group.
申请人：ASAHI KOGAKU KOGYO KABUSHIKI KAISHA
代理机构：Greenblum & Bernstein, PC.
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