Gauss type photographic lens
US4390252A · kind A · utility
5Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1980 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Jul 18, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A Gauss type photographic lens comprises, in succession from the object side, a first group including a positive lens component, a second group including a positive lens and a negative lens and having a negative refractive power as a whole, a third group including a meniscus lens component comprising a negative lens and a positive lens cemented together and having its concave surface facing the object side, and a fourth group including a positive lens component. The lens component in said fourth group is movable along the optical axis and the focusing is accomplished only by movement of said movable lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.