| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_063a1b324005ddc15e16e7529c6258c4 |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B2007-0006 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B5-1866
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B5-32
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B13-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B27-4294
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B5-1876
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1353
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B5-1895
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/G11B7-1367
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1275
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-13925 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-125 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B13-00
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/G02B5-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B5-32
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-0065
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-1374
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B3-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B3-00 |
| filingDate |
2003-06-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_04978730b20e5955311be0eb57713577 |
| publicationDate |
2010-08-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-2221815-A1 |
| titleOfInvention |
Complex objective lens, optical head, optical information apparatus, computer, optical disk player, car navigation system, optical disk recorder and optical disk server |
| abstract |
A complex objective lens for condensing a light beam onto an information recording surface of an optical disk having a base, comprising: an optical element having a relief structure on a surface thereof, and a refraction type lens, thereby condensing a first light beam having a wavelength λ1 in a range of 390 nm to 415 nm and a second light beam having a wavelength λ2 in a range of 630 nm to 680 nm onto an information recording surface of the optical disk, wherein the optical element has a stepped cross-section, a height of the stepped cross-section being an integral multiple of a unit level difference d2, and the unit level difference d2 gives a difference in optical path length longer than 1 wavelength to the first light beam and gives a difference in optical path length shorter than 1 wavelength to the second light beam, so that the unit level difference d2 adds an optical path length to the first light beam and subtracts an optical path length from the second light beam. |
| priorityDate |
2002-06-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |