| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_14df928cce1112b89356928855b60351 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B2007-0006 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B27-0037
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1353
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1374
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-13922
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B27-4283
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B27-4288
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B13-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B5-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B13-146 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-00 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B5-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-1374
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-1392
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-1353
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-135
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B13-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B13-14
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B27-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B3-10 |
| filingDate |
2005-04-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_64a25603def1a02b071728559afed2d0 |
| publicationDate |
2005-12-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-2005270958-A1 |
| titleOfInvention |
Objective lens and optical pickup apparatus |
| abstract |
The present invention includes relates to an objective lens used for reproducing and/or recording of information for at least two types of optical discs including high density discs, and has excellent wavelength characteristics, temperature characteristics and tracking characteristics and to provide an optical pickup apparatus employing this objective lens. An objective lens according to the present invention is used for an optical pickup apparatus at least reproducing and/or recording information for a first optical disc having a protective substrate with a thickness t1 and a second optical disc having a protective substrate with a thickness t2 (0.8×t1≦t2). Each of the light fluxes with a wavelength λ1 and a wavelength λ2 enters into the objective lens and a diffractive structure is formed on the at least one optical surface of the objective lens, signs and values of an optical system magnification of the objective lens m1 and m2 for the light fluxes with wavelength λ1 and λ2 respectively are different each other, and the diffractive structure has a positive diffractive action. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010085861-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7072118-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2007070860-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2007014211-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2006280061-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2006245315-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7839752-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7742370-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7738345-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7787349-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2005190463-A1 |
| priorityDate |
2004-04-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |