10x zoom ratio wide-angle zoom lens
US6762886B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2003 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Jun 12, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A 10× ratio wide-angle zoom lens includes several lens sets which is made of several lenses with different focal lengths. It has a first lens set with a positive dioptre, a second lens set with a negative dioptre, a third lens set with a positive dioptre, and a fourth lens set with a positive dioptre. The second lens set further contains two lenses with negative dioptres and one lens with a positive dioptre. The lens with a positive dioptre has a non-spherical surface on the object side. The lens with a negative dioptre closer to the lens with a positive dioptre is cemented to the positive-dioptre lens. The fourth lens set contains a lens with a negative dioptre and two non-spherical surfaces. The wide-angle zoom lens moves the second and the fourth lens set along its optical axis to adjust its zoom and moves the fourth lens set to focus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.