Zoom lens system
US4568150A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1984 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Mar 28, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system comprising a first, second, third and fourth lens groups, the first lens group being a focusing lens group and having positive refractive power, the second lens group being a variator and having negative refractive power, the third lens group being a compensator and having positive refractive power, the first, second and third lens groups constituting a varifocal subsystem, the fourth lens group being a relay lens, which comprises a first lens component comprising a positive lens and a negative lens and having positive refractive power as a whole, a second lens component comprising a positive lens, a third lens component comprising a negative lens, and a fourth lens component comprising a positive lens, the zoom lens system being small in size, light in weight and arranged that aberrations are corrected favourably.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.