Telephoto lens system
US4338001A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 27, 1980 |
| Grant date | Jul 6, 1982 |
| Priority date | — |
| Expiry date | May 27, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A telephoto lens system has a convergent forward group and a divergent rearward group. The forward group includes a first lens which is a biconvex lens having its surface of greater curvature facing the object side, a second lens which is a biconcave lens having its surface of greater curvature facing the object side, and a third lens which is a positive meniscus lens having its convex surface facing the object side. The rearward group includes a fourth lens which is a concave lens having its surface of greater curvature facing the object side, and a fifth lens which is a biconvex lens. The lens system satisfies predetermined conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.