Two-group small zoom lens
US6014268A · kind A · utility
5Cited by
6References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Feb 17, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/177
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An inexpensive, high performance zoom lens includes, as measured from the object side, a negative first lens group and a positive second lens group. The overall length of the zoom lens is reduced by making one of the lens element surfaces of the first lens group G.sub.1 aspherical. A lens element in the second lens group is designed to be a biconvex lens with the same absolute value of radii of curvature, to thereby make the zoom lens inexpensive to produce and assemble.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.