| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_ee1c19da359446fb5c4f0458a57b783d |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B2007-0006 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B5-3083
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1369
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G11B7-1365 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-135
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B11-00 |
| filingDate |
2007-03-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_5025ef57810bf723f61792319f00695e
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ac5b322382fbd90c068ceeda8d62eca0
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6994c124cdbb98e43c539e348a7f8745 |
| publicationDate |
2007-07-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-2007159932-A1 |
| titleOfInvention |
Optical head device |
| abstract |
An optical head device having a broadband phase plate of transforming at least three linearly polarized light beams having different wavelengths into circularly polarized light beams, is obtained. n A broadband phase plate comprising two phase plates 9 A and 9 B laminated with e.g. an adhesive agent so that their optical axes are crossed, wherein provided that wavelengths of linearly polarized incident light beams are λ 1 , λ 2 and λ 3 (λ 1 <λ 2 <λ 3 ), at least one or both of the two phase plates has such a phase difference characteristics that a ratio R(λ 1 )/R(λ 3 ) and a ratio R(λ 2 )/R(λ 3 ) between retardation values of the wavelengths are smaller than 1 and R(λ 1 )/R(λ 3 ) is smaller than R(λ 2 )/R(λ 3 ) , is integrated in the optical head device. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7907499-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010002299-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-7894321-B2
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2008310285-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2017023715-A1
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2010128593-A1 |
| priorityDate |
2004-09-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |