http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-WO2008007552-A1
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B2007-0006 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B5-18 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/G11B7-1353 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B13-00 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-135 |
| filingDate | 2007-06-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2009-12-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-WO2008007552-A1 |
| titleOfInvention | Optical pickup device, objective optical element, and optical information recording / reproducing device |
| abstract | An optical pickup device having a first light source that emits a first light beam, a second light source that emits a second light beam, a third light source that emits a third light beam, and an objective optical element, The optical surface of the objective optical element has at least a central region and a peripheral region, the central region has a first optical path difference providing structure, and the peripheral region has a second optical path difference providing structure, A first best focus and a second best focus are formed by the third light flux that has passed through the first optical path difference providing structure, In the spot formed on the information recording surface of the third optical disc by the third light beam that has passed through the objective optical element, a spot central portion, a spot intermediate portion, and a spot peripheral portion are formed, The spot central portion is used for recording and / or reproducing information on the third optical disc, and the spot intermediate portion and the spot peripheral portion are not used for recording and / or reproducing information on the third optical disc, A spot peripheral portion is formed on the information recording surface of the third optical disc by the third light flux that has passed through the second optical path difference providing structure. |
| priorityDate | 2006-07-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 172.