Zoom lens system
US4504125A · kind A · utility
4Cited by
4References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1982 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Nov 4, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system with a zoom ratio about 3 comprising a first lens group to be used for focusing, a second lens group which is a variator, a third lens group which is a compensator, and a fourth lens group which is a master lens, the second lens group being provided with a lens surface having the correcting function for chromatic aberration and a lens surface having the correcting function for spherical aberration so that chromatic aberration of spherical aberration is thereby corrected favorably.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.