Compact zoom lens system
US4592626A · kind A · utility
7Cited by
4References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1984 |
| Grant date | Jun 3, 1986 |
| Priority date | — |
| Expiry date | Nov 9, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/173
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact zoom lens system is disclosed having a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group with negative refractive power, such that the second and third lens groups are moved for the purpose of zooming, and the first lens group is moved in order to compensate for the movement of image surface, the entire system having a large zoom ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.