http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2003016655-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5547f741b25666fc4ae5195cf71a979b |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G11B7-0055 |
| filingDate | 2001-07-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c0b1a71ad4561d18be1f51a953925c5c |
| publicationDate | 2003-01-17-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-2003016655-A |
| titleOfInvention | Phase change optical disk initialization apparatus and initialization method |
| abstract | (57) [Summary] [PROBLEMS] It is possible to perform initialization with high accuracy even when the disk configuration conditions and head conditions are not uniform, and to eliminate uneven initialization and local defects existing in the medium. Provided are an initialization apparatus and an initialization method for a phase change optical disk that can be reliably detected. A light source LD and an optical system for irradiating a recording layer of a phase change optical disk with laser light, a photodetector for receiving light reflected from the phase change optical disk, and an amplifier for amplifying an output of the photodetector. A fluctuation period detection circuit 40 and a fluctuation width detection circuit 41 for detecting a fluctuation period and a fluctuation width of reflected light from the amplified output; and an initial period for determining whether to perform initialization again with reference to the output of the fluctuation period detection circuit. Continuation determination circuit 50 And a defect determination circuit 51 that determines the presence or absence of a defect by referring to the output of the fluctuation width detection circuit, and resets a threshold value in each of the fluctuation cycle detection circuit and the fluctuation width detection circuit at each initialization, Based on the threshold value, the determination of whether to continue initialization and the determination of a defect are performed. |
| priorityDate | 2001-07-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
| Predicate | Subject |
|---|---|
| isDiscussedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/substance/SID426105649 http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID6432049 |
Total number of triples: 12.