Photographic lens system for compact cameras
US4576448A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1983 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Jun 7, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic lens system for compact cameras comprising a first, second, third, fourth and fifth lenses, the first lens being a positive meniscus lens arranged to be convex toward the object side, the second lens being a biconcave lens, the third lens being a positive lens, the fourth lens being a biconvex lens, the fifth lens being a negative meniscus lens arranged to be convex toward the image side, the photographic lens system being arranged to make aberrations, especially astigmatic difference and positive distortion, small by giving a large thickness to the fourth lens located on the image side by the stop and, at the same time, arranged to have a field angle of 70.degree. or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.