Telephoto lens system
US4062630A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 1976 |
| Grant date | Dec 13, 1977 |
| Priority date | — |
| Expiry date | Mar 11, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A telephoto lens system having a relatively large aperture is composed of six lenses collected into four lens members, successively arranged, from the object side of the system to the image side, as follows: a first lens member including a positive lens whose convex surface faces the object side; a second lens member including a negative meniscus lens whose convex surface faces the object side and, a positive meniscus lens cemented to the negative meniscus lens; a third lens member including a positive lens whose convex surface faces the image side, and a biconcave lens cemented to the positive lens; and a fourth lens member consisting of a positive lens. The aberrations of the telephoto lens system of the invention are reduced even though the aperture is relatively larger than the apertures of prior art lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.