Zoom lens for photographic printers
US4247168A · kind A · utility
1Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1978 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Oct 27, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/142
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A three-component zoom lens in which the middle component is axially adjustable and has a positive refractive power which in absolute terms is at least twice that of the other two lens components. A diaphragm is disposed in the movable middle component. For image position correction, means kinematically coupled to the middle component are provided for the joint axial displacement of all three lens components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.