Compact telephoto lens
US4303314A · kind A · utility
2Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 3, 1980 |
| Grant date | Dec 1, 1981 |
| Priority date | — |
| Expiry date | Mar 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact telephoto lens comprises, in succession from the object side, a first lens which is a single positive lens having its surface of sharper curvature facing the object side, a second lens which is a positive meniscus lens having its convex surface facing the object side, a third lens which is a single negative lens having its surface of sharper curvature facing the image side, a stop, and a fourth lens which is a single positive lens having its surface of sharper curvature facing the object side. The telephoto lens satisfies specific conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.