Compact zoom lens

Compact zoom lens

A compact and inexpensive zoom lens having a variable power ratio of two or greater and reduced total length of the lens system. The compact zoom lens comprises a first lens group having a negative refractive power and a second lens group having a positive refractive power in this order from the obj...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: SATO, SUSUMO, KODAMA, NAOKO
Format: Patent
Sprache:eng
Schlagworte:
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
container_end_page
container_issue
container_start_page
container_title
container_volume
creator SATO
SUSUMO
KODAMA
NAOKO
description A compact and inexpensive zoom lens having a variable power ratio of two or greater and reduced total length of the lens system. The compact zoom lens comprises a first lens group having a negative refractive power and a second lens group having a positive refractive power in this order from the object side. The first lens group includes a negative lens component L1 and a positive lens L2 in this order from the object side. The second lens group includes a positive lens component L3, a negative lens L4 and a positive lens L5 positioned in this order from the object side with an air gap between them. When the focal legth of the whole lens system is varied from its wide-angle end to the telephoto end, the second lens group is being moved toward the object side from the image side. This zoom lens satisfies the conditions0.7
format Patent
fullrecord <record><control><sourceid>epo_EVB</sourceid><recordid>TN_cdi_epo_espacenet_US5963379A</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>US5963379A</sourcerecordid><originalsourceid>FETCH-epo_espacenet_US5963379A3</originalsourceid><addsrcrecordid>eNrjZBB0zs8tSEwuUajKz89VyEnNK-ZhYE1LzClO5YXS3Azybq4hzh66qQX58anFQMWpeakl8aHBppZmxsbmlo7GhFUAAFS0HvQ</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>patent</recordtype></control><display><type>patent</type><title>Compact zoom lens</title><source>esp@cenet</source><creator>SATO; SUSUMO ; KODAMA; NAOKO</creator><creatorcontrib>SATO; SUSUMO ; KODAMA; NAOKO</creatorcontrib><description>A compact and inexpensive zoom lens having a variable power ratio of two or greater and reduced total length of the lens system. The compact zoom lens comprises a first lens group having a negative refractive power and a second lens group having a positive refractive power in this order from the object side. The first lens group includes a negative lens component L1 and a positive lens L2 in this order from the object side. The second lens group includes a positive lens component L3, a negative lens L4 and a positive lens L5 positioned in this order from the object side with an air gap between them. When the focal legth of the whole lens system is varied from its wide-angle end to the telephoto end, the second lens group is being moved toward the object side from the image side. This zoom lens satisfies the conditions0.7&lt;f2/FW&lt;1.4-1.7&lt;f1/FW&lt;-1.0where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, and FW is the focal length of the whole lens system at the wide-angle end.</description><edition>6</edition><language>eng</language><subject>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS ; OPTICS ; PHYSICS</subject><creationdate>1999</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=19991005&amp;DB=EPODOC&amp;CC=US&amp;NR=5963379A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19991005&amp;DB=EPODOC&amp;CC=US&amp;NR=5963379A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>SATO; SUSUMO</creatorcontrib><creatorcontrib>KODAMA; NAOKO</creatorcontrib><title>Compact zoom lens</title><description>A compact and inexpensive zoom lens having a variable power ratio of two or greater and reduced total length of the lens system. The compact zoom lens comprises a first lens group having a negative refractive power and a second lens group having a positive refractive power in this order from the object side. The first lens group includes a negative lens component L1 and a positive lens L2 in this order from the object side. The second lens group includes a positive lens component L3, a negative lens L4 and a positive lens L5 positioned in this order from the object side with an air gap between them. When the focal legth of the whole lens system is varied from its wide-angle end to the telephoto end, the second lens group is being moved toward the object side from the image side. This zoom lens satisfies the conditions0.7&lt;f2/FW&lt;1.4-1.7&lt;f1/FW&lt;-1.0where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, and FW is the focal length of the whole lens system at the wide-angle end.</description><subject>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</subject><subject>OPTICS</subject><subject>PHYSICS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1999</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZBB0zs8tSEwuUajKz89VyEnNK-ZhYE1LzClO5YXS3Azybq4hzh66qQX58anFQMWpeakl8aHBppZmxsbmlo7GhFUAAFS0HvQ</recordid><startdate>19991005</startdate><enddate>19991005</enddate><creator>SATO; SUSUMO</creator><creator>KODAMA; NAOKO</creator><scope>EVB</scope></search><sort><creationdate>19991005</creationdate><title>Compact zoom lens</title><author>SATO; SUSUMO ; KODAMA; NAOKO</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US5963379A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1999</creationdate><topic>OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS</topic><topic>OPTICS</topic><topic>PHYSICS</topic><toplevel>online_resources</toplevel><creatorcontrib>SATO; SUSUMO</creatorcontrib><creatorcontrib>KODAMA; NAOKO</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>SATO; SUSUMO</au><au>KODAMA; NAOKO</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Compact zoom lens</title><date>1999-10-05</date><risdate>1999</risdate><abstract>A compact and inexpensive zoom lens having a variable power ratio of two or greater and reduced total length of the lens system. The compact zoom lens comprises a first lens group having a negative refractive power and a second lens group having a positive refractive power in this order from the object side. The first lens group includes a negative lens component L1 and a positive lens L2 in this order from the object side. The second lens group includes a positive lens component L3, a negative lens L4 and a positive lens L5 positioned in this order from the object side with an air gap between them. When the focal legth of the whole lens system is varied from its wide-angle end to the telephoto end, the second lens group is being moved toward the object side from the image side. This zoom lens satisfies the conditions0.7&lt;f2/FW&lt;1.4-1.7&lt;f1/FW&lt;-1.0where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, and FW is the focal length of the whole lens system at the wide-angle end.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record>
fulltext fulltext_linktorsrc
identifier
ispartof
issn
language eng
recordid cdi_epo_espacenet_US5963379A
source esp@cenet
subjects OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
title Compact zoom lens
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-22T22%3A36%3A36IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-epo_EVB&rft_val_fmt=info:ofi/fmt:kev:mtx:patent&rft.genre=patent&rft.au=SATO;%20SUSUMO&rft.date=1999-10-05&rft_id=info:doi/&rft_dat=%3Cepo_EVB%3EUS5963379A%3C/epo_EVB%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_id=info:pmid/&rfr_iscdi=true