Compact zoom lens system having three lens groups
US4623226A · kind A · utility
11Cited by
5References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1982 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Dec 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/143105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact zoom lens system having excellent performance and comprising a first lens group having positive refractive power, a second lens group having negative refractive power and a third lens group having positive refractive power, said third lens group being fixed relative to the image plane, said second lens group being moved along the optical axis for varying magnification, and deviation of the image position caused by moving said second lens group is compensated by moving said first lens group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.