http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2014164791-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c97f90ab12b35b650d5fd039ed7a41a5 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-135 |
| filingDate | 2013-02-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_09146239035b3149ece446bd5fb70659 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fcdff1f6c3ae473005cca3017a3be481 |
| publicationDate | 2014-09-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-2014164791-A |
| titleOfInvention | Objective lens for optical pickup device, optical pickup device and optical information recording / reproducing device |
| abstract | [PROBLEMS] To reduce spherical aberration when the wavelength of a light source changes or when the temperature changes while allowing a common objective lens to be compatible with, for example, three types of optical disks of BD / DVD / CD while having a small effective diameter. An objective lens for an optical pickup device that can be suppressed, and an optical pickup device and an optical information recording / reproducing device using the objective lens are provided. A fifth foundation structure is a two-level stepped structure having a plurality of large annular zones, and each of the large annular zones includes a plurality of small annular zones constituting a third foundation structure and a fourth foundation structure. In each large annular zone, the optical axis direction distance from the highest vertex to the lowest bottom of the small annular zones is ΔL (μm), and the optical axis orthogonal width of one large annular zone is W (mm). When the number of small ring zones included in the belt is N, the following equation is established. 1.10 μm ≦ ΔL ≦ 1.30 μm (1) W / N ≧ 2.8mm (2) [Selection] Figure 20 |
| priorityDate | 2013-02-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 132.