发明名称 |
Wide-angle attachment for varifocal objective |
摘要 |
A varifocal object selectively focusable upon a normal range of object distances and a substantially shorter macro range can be supplemented by a negative component of one or more lenses whose focal length is less than the depth of the macro range and which forms a virtual image of a nearby object on the object plane of the objective when the latter is adjusted to a predetermined closeup position. A correlating linkage between a seat for the supplemental component and a control member designed to establish the closeup position serves to index the control member in that position or to prevent the emplacement of the supplemental component if the objective is in a different position.
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申请公布号 |
US4110005(A) |
申请公布日期 |
1978.08.29 |
申请号 |
US19760711835 |
申请日期 |
1976.08.05 |
申请人 |
BOLEX INTERNATIONAL SA |
发明人 |
BOHM, KURT;ROLLENITZ, LEOPOLD;LAURENT, FRANCOIS |
分类号 |
G02B7/105;G02B13/18;G02B15/06;G02B15/14;G02B15/22;(IPC1-7):G02B15/18;G02B7/02 |
主分类号 |
G02B7/105 |
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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