| 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/G11B7-139
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B13-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B13-001
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B27-42
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B5-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1353
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1369
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1374
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-13922 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-00 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B27-42
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B13-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-1392
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-139
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-1369
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-1353
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B5-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B13-00 |
| filingDate |
2004-12-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_839fc9d245b2be8ebf52acc13da56cb0 |
| publicationDate |
2005-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
TW-200523913-A |
| titleOfInvention |
Diffractive optical element, objective optical system, optical pick-up device and optical information recording reproducing apparatus |
| abstract |
A diffractive optical element, comprises a first diffractive structure to generate n11-th order diffracted ray when a first light flux having λ1 (nm) of a wavelength comes in and to generate n21-th order diffracted ray (n11.≥n21) when a second light flux having λ2 (nm) (λ2>λ1) comes in; and a second diffractive structure to generate n12-th order diffracted ray when the first light flux comes in and to generate n22-th order diffracted ray (n12.≥n22) when the second light comes in. The diffractive optical element satisfies the following formula: Δφa12≠Δφb12, where Δφa12={n11.Λ1/(N11-1)}/{n21.Λ2/(N21-1)}, and Δφb12={n12.Λ1/(N12-1)}/{n22.Λ2/(N22-1)}, wherein N11, N21 are refractive index of the first diffractive structure respectively for λ1 and λ2, and N12, N22 are refractive index of the second diffractive structure respectively for λ1 and λ2. |
| priorityDate |
2003-12-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |