Gauss type photographic lens
US4426137A · kind A · utility
6Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1982 |
| Grant date | Jan 17, 1984 |
| Priority date | — |
| Expiry date | Feb 3, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/42
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A Gauss type photographic lens comprises, in succession from the object side, a first lens component of positive refractive power fixed relative to the image plane, a second lens component of negative refractive power fixed relative to the image plane, a third lens component of negative refractive power movable relative to the image plane, and a fourth lens component of positive refractive power movable relative to the image plane. The third lens component and the fourth lens component are movable by different amounts in the same direction for focusing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.