http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-WO2012063850-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/G11B7-1353 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B27-0025 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/G02B7-008 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G02B3-08 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-1392 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-135 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-126 |
| filingDate | 2011-11-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 2014-05-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-WO2012063850-A1 |
| titleOfInvention | Objective lens for optical pickup device, optical pickup device and optical information recording / reproducing device |
| abstract | While reducing the cost, it is possible to perform compatibility of the three types of optical discs of BD / DVD / CD with a common objective lens, while improving temperature characteristics and suppressing fluctuations in diffraction efficiency at the time of wavelength change. Provided are an optical pickup device having an objective lens that can be used, an optical information recording / reproducing device, and an objective lens suitable therefor. When the light beam incident on the objective lens has a longer wavelength, the axial chromatic aberration is changed in the positive direction so as to satisfy the expression (1), thereby passing through the first basic structure and the second basic structure. In this case, the unnecessary light generated by focusing the light is condensed relatively far from the information recording surface (also referred to as an information recording layer) on which information is recorded / reproduced, so that an error signal is hardly generated. 0.3 (μm / nm) ≦ ΔWD / Δλ ≦ 0.6 (μm / nm) (1) Here, Δλ (nm) represents the change amount of the light source wavelength, and ΔWD (μm) represents the longitudinal chromatic aberration of the objective lens caused by the change Δλ of the light source wavelength. |
| priorityDate | 2010-11-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 139.