Wide-angle zoom lens having five lens units
US5253113A · kind A · utility
32Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1991 |
| Grant date | Oct 12, 1993 |
| Priority date | — |
| Expiry date | Sep 3, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/177
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide-angle zoom lens comprising five lens units of negative, negative, positive, negative and positive refractive powers in this order from the object side, zooming from the wide-angle end to the telephoto end being performed by moving the second lens unit so as to have a locus convex toward the image side and moving the third and fifth lens units toward the object side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.