Zoom lens
US5191475A · kind A · utility
12Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Dec 10, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144109
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens comprising, from front to rear, a focusing lens group, a variator lens group, a compensator lens group and a relay lens group, the relay lens group consisting of a front part and a rear part with a longest air spacing therebetween, and the rear part including a first movable lens component arranged upon setting of macro photography made to move along an optical axis, and a second movable lens component arranged upon setting of tracking adjustment made to move along the optical axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.