Photographic lens for electronic still camera
US6285516A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2000 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Mar 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic lens for an electronic still camera having five lens components, with refractive powers in sequential order from the most object side, as follows: negative, positive, positive, negative and positive. A stop is positioned between the second lens component and the third lens component. The photographic lens has a short overall length, a wide angle of view, a large numerical aperture, and high resolution as a result of the lens being favorably corrected for aberrations. The first lens component includes at least one ashperical surface, the second lens component has a convex surface on the image side, the third lens component has at least one aspherical surface, and has a convex surface on the image side. The fourth lens component has a concave surface on the object side, and the fifth lens component has a convex surface on the image side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.