http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8780453-B2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e571bd405d45c53ba9ef151949b9023e http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1af8df51ce24ca931ae718fb747f6aa0 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B15-17 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B15-144109 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B15-14 |
| filingDate | 2012-02-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2014-07-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c7ea763813abb1d66282db481f17d216 |
| publicationDate | 2014-07-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-8780453-B2 |
| titleOfInvention | Zoom lens and image pickup apparatus having the same |
| abstract | A zoom lens includes, in order from object side, a positive first lens unit which does not move for varying magnification, a negative second lens unit which moves for varying magnification, a negative third lens unit which moves for varying magnification, and a positive fourth lens unit which does not move for varying magnification, wherein the first lens unit includes a positive lens which satisfies the following conditions: 70<νp<85; 2.31<Np+0.01×νp<2.58; and 1.6<Np<1.85, where Np is refractive index of the positive lens, and νp is Abbe constant of the positive lens, and 1.25<|fp/fna|<1.7 is satisfied, where fp is focal length of the positive lens, and fna is combined focal length of negative lenses in the first lens unit defined by the equation: n fna = 1 ∑ i = 1 n 1 fn i , nwhere n is a number of the negative lenses in the first lens unit, and fni is focal length of the i-th negative lens. |
| priorityDate | 2011-03-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 20.