Zoom lens
211 2 A zoom lens comprises, in order from an object side to an image side, a lens group having negative refracting power, and a lens group having positive refracting power. Zooming is carried out with a change in a space between at least said two lens groups. The lens group having negative refracti...
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| creator | Ishii, Atsujiro |
| description | 211 2 A zoom lens comprises, in order from an object side to an image side, a lens group having negative refracting power, and a lens group having positive refracting power. Zooming is carried out with a change in a space between at least said two lens groups. The lens group having negative refracting power comprises a plurality of aspheric surfaces. The lens group having positive refracting power comprises at least one aspherie surface. The lens group having negative refracting power comprises at least three negative lenses, with satisfaction of the following condition: 2.3 |
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The lens group having negative refracting power comprises a plurality of aspheric surfaces. The lens group having positive refracting power comprises at least one aspherie surface. The lens group having negative refracting power comprises at least three negative lenses, with satisfaction of the following condition: 2.3<|f/f<3.1, where fis a focal length of said lens group having negative refracting power, and fis a focal length of said lens group having positive refracting power.</description><language>eng</language><creationdate>2007</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7280284$$EPDF$$P50$$Guspatents$$Hfree_for_read</linktopdf><link.rule.ids>230,308,780,802,885,64038</link.rule.ids><linktorsrc>$$Uhttps://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/7280284$$EView_record_in_USPTO$$FView_record_in_$$GUSPTO$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>Ishii, Atsujiro</creatorcontrib><creatorcontrib>Olympus Corporation</creatorcontrib><title>Zoom lens</title><description>211 2 A zoom lens comprises, in order from an object side to an image side, a lens group having negative refracting power, and a lens group having positive refracting power. Zooming is carried out with a change in a space between at least said two lens groups. The lens group having negative refracting power comprises a plurality of aspheric surfaces. The lens group having positive refracting power comprises at least one aspherie surface. The lens group having negative refracting power comprises at least three negative lenses, with satisfaction of the following condition: 2.3<|f/f<3.1, where fis a focal length of said lens group having negative refracting power, and fis a focal length of said lens group having positive refracting power.</description><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2007</creationdate><recordtype>patent</recordtype><sourceid>EFH</sourceid><recordid>eNrjZOCMys_PVchJzSvmYWBNS8wpTuWF0twMCm6uIc4euqXFBYklqXklxfHpRYkgysDcyMLAyMLEmAglAIG4HVM</recordid><startdate>20071009</startdate><enddate>20071009</enddate><creator>Ishii, Atsujiro</creator><scope>EFH</scope></search><sort><creationdate>20071009</creationdate><title>Zoom lens</title><author>Ishii, Atsujiro</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-uspatents_grants_072802843</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2007</creationdate><toplevel>online_resources</toplevel><creatorcontrib>Ishii, Atsujiro</creatorcontrib><creatorcontrib>Olympus Corporation</creatorcontrib><collection>USPTO Issued Patents</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Ishii, Atsujiro</au><aucorp>Olympus Corporation</aucorp><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Zoom lens</title><date>2007-10-09</date><risdate>2007</risdate><abstract>211 2 A zoom lens comprises, in order from an object side to an image side, a lens group having negative refracting power, and a lens group having positive refracting power. Zooming is carried out with a change in a space between at least said two lens groups. The lens group having negative refracting power comprises a plurality of aspheric surfaces. The lens group having positive refracting power comprises at least one aspherie surface. The lens group having negative refracting power comprises at least three negative lenses, with satisfaction of the following condition: 2.3<|f/f<3.1, where fis a focal length of said lens group having negative refracting power, and fis a focal length of said lens group having positive refracting power.</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng |
| recordid | cdi_uspatents_grants_07280284 |
| source | USPTO Issued Patents |
| title | Zoom lens |
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