Large aperture ratio, long focus lens

Large aperture ratio, long focus lens

A compact, large aperture ratio, long focus lens having a short total length includes, in succession from the object side, a first group comprising a positive meniscus lens having its convex surface facing the object side, a second group comprising a positive meniscus lens having its convex surface...

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Hauptverfasser: FUJIE, DAIJIRO
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Sprache:eng
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OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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DAIJIRO
description A compact, large aperture ratio, long focus lens having a short total length includes, in succession from the object side, a first group comprising a positive meniscus lens having its convex surface facing the object side, a second group comprising a positive meniscus lens having its convex surface facing the object side, a third group comprising a negative meniscus lens consisting of a biconvex lens and a biconcave lens cemented thereto and having its convex surface facing the object side, a diaphragm, a fourth group comprising a meniscus lens consisting of a negative lens and a positive lens cemented thereto and having its convex surface facing the image side, and a fifth group comprising a positive lens.
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DAIJIRO</creator><scope>EVB</scope></search><sort><creationdate>19830802</creationdate><title>Large aperture ratio, long focus lens</title><author>FUJIE; DAIJIRO</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US4396256A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1983</creationdate><topic>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</topic><topic>OPTICS</topic><topic>PHYSICS</topic><toplevel>online_resources</toplevel><creatorcontrib>FUJIE; DAIJIRO</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>FUJIE; DAIJIRO</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Large aperture ratio, long focus lens</title><date>1983-08-02</date><risdate>1983</risdate><abstract>A compact, large aperture ratio, long focus lens having a short total length includes, in succession from the object side, a first group comprising a positive meniscus lens having its convex surface facing the object side, a second group comprising a positive meniscus lens having its convex surface facing the object side, a third group comprising a negative meniscus lens consisting of a biconvex lens and a biconcave lens cemented thereto and having its convex surface facing the object side, a diaphragm, a fourth group comprising a meniscus lens consisting of a negative lens and a positive lens cemented thereto and having its convex surface facing the image side, and a fifth group comprising a positive lens.</abstract><oa>free_for_read</oa></addata></record>
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subjects OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
title Large aperture ratio, long focus lens
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