Compact high ratio zoom lens system

Compact high ratio zoom lens system

A zoom lens system comprises from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power, and a fifth lens unit of negative refractive power. The...

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Hauptverfasser: ARIMOTO, TETSUYA
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Sprache:eng
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OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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TETSUYA
description A zoom lens system comprises from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power, and a fifth lens unit of negative refractive power. The first, third and fourth lens units move towards the object side in a zooming operation from the shortest focal length condition to the longest focal length condition. Further, the zoom lens system fulfills the following conditions: 0.4
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The first, third and fourth lens units move towards the object side in a zooming operation from the shortest focal length condition to the longest focal length condition. Further, the zoom lens system fulfills the following conditions: 0.4<¦f2¦/fw<0.5 1.0<¦f5¦/f4<5.0 2.5<e3T/e3W<4.5 wherein f2 represents a focal length of the second lens unit, fw represents a focal length of the whole zoom lens system in the shortest focal length condition, f5 represents a focal length of the fifth lens unit, f4 represents a focal length of the fourth lens unit, e3T represents an axial distance between the third and fourth lens units in the longest focal length condition, and e3W represents an axial distance between the third and fourth lens units in the shortest focal length condition.]]></description><language>eng</language><subject>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS ; OPTICS ; PHYSICS</subject><creationdate>1993</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19930209&amp;DB=EPODOC&amp;CC=US&amp;NR=5185678A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19930209&amp;DB=EPODOC&amp;CC=US&amp;NR=5185678A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>ARIMOTO; TETSUYA</creatorcontrib><title>Compact high ratio zoom lens system</title><description><![CDATA[A zoom lens system comprises from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power, and a fifth lens unit of negative refractive power. The first, third and fourth lens units move towards the object side in a zooming operation from the shortest focal length condition to the longest focal length condition. Further, the zoom lens system fulfills the following conditions: 0.4<¦f2¦/fw<0.5 1.0<¦f5¦/f4<5.0 2.5<e3T/e3W<4.5 wherein f2 represents a focal length of the second lens unit, fw represents a focal length of the whole zoom lens system in the shortest focal length condition, f5 represents a focal length of the fifth lens unit, f4 represents a focal length of the fourth lens unit, e3T represents an axial distance between the third and fourth lens units in the longest focal length condition, and e3W represents an axial distance between the third and fourth lens units in the shortest focal length condition.]]></description><subject>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</subject><subject>OPTICS</subject><subject>PHYSICS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1993</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZFB2zs8tSEwuUcjITM9QKEosycxXqMrPz1XISc0rViiuLC5JzeVhYE1LzClO5YXS3Azybq4hzh66qQX58anFQO2peakl8aHBpoYWpmbmFo7GhFUAAEeXJcY</recordid><startdate>19930209</startdate><enddate>19930209</enddate><creator>ARIMOTO; TETSUYA</creator><scope>EVB</scope></search><sort><creationdate>19930209</creationdate><title>Compact high ratio zoom lens system</title><author>ARIMOTO; TETSUYA</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US5185678A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1993</creationdate><topic>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</topic><topic>OPTICS</topic><topic>PHYSICS</topic><toplevel>online_resources</toplevel><creatorcontrib>ARIMOTO; TETSUYA</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>ARIMOTO; TETSUYA</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Compact high ratio zoom lens system</title><date>1993-02-09</date><risdate>1993</risdate><abstract><![CDATA[A zoom lens system comprises from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power, and a fifth lens unit of negative refractive power. The first, third and fourth lens units move towards the object side in a zooming operation from the shortest focal length condition to the longest focal length condition. Further, the zoom lens system fulfills the following conditions: 0.4<¦f2¦/fw<0.5 1.0<¦f5¦/f4<5.0 2.5<e3T/e3W<4.5 wherein f2 represents a focal length of the second lens unit, fw represents a focal length of the whole zoom lens system in the shortest focal length condition, f5 represents a focal length of the fifth lens unit, f4 represents a focal length of the fourth lens unit, e3T represents an axial distance between the third and fourth lens units in the longest focal length condition, and e3W represents an axial distance between the third and fourth lens units in the shortest focal length condition.]]></abstract><oa>free_for_read</oa></addata></record>
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OPTICS
PHYSICS
title Compact high ratio zoom lens system
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