http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2001311864-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1c3026bd5177f1c397fc6c388925ddf3 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03B13-36 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B7-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02B7-28 |
| filingDate | 2000-04-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1fe1e9dd8aabba8d796e32ecd25eacec |
| publicationDate | 2001-11-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-2001311864-A |
| titleOfInvention | Zoom lens barrel and focusing control method |
| abstract | (57) [Problem] To provide a zoom lens barrel in which a lens barrel rotation position serving as a focusing reference hardly shifts even after long-term use, and a focusing control method using the same. SOLUTION: In a zoom lens barrel integrally driven with zoom focus, a zoom reference switch which is constituted by an intercept switch and provides one zoom reference pulse 213a for each zoom position, and a first gear which is always connected to an outer cylinder portion. A coarse pulse generator that generates a coarse pulse FP of wavelength λ in conjunction with the outer cylinder through a train, and is shorter than λ / 2 in conjunction with the outer cylinder through a second gear train in the outer cylinder; Fine pulse DM of wavelength And a fine pulse generator for generating P. Coarse pulse F The wavelength λ of P is longer than a length corresponding to a lens barrel rotation amount twice as large as a lens barrel rotation amount corresponding to a position error of the zoom reference pulse 213a that can occur due to the intercept switch, It is shorter than the length corresponding to the total barrel rotation amount at each zoom position. |
| priorityDate | 2000-04-28-04:00^^<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/SID415828825 http://rdf.ncbi.nlm.nih.gov/pubchem/compound/CID131979 |
Total number of triples: 14.