Miniature zoom lens
US8218244B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2010 |
| Grant date | Jul 10, 2012 |
| Priority date | — |
| Expiry date | Jan 12, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/009
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A miniature zoom lens includes a first, a second and a third lens groups arranged along an optical axis and from an object side to an image side in sequence. The refractive powers of the three lens groups are negative, positive and positive, respectively. The first lens group is fixed at a predetermined position. The second lens group is movable along the optical axis in accordance with a change of magnification. The third lens group is movable along the optical axis for keeping an image plane fixed at an image sensor. The first lens group is in resting state and the second and the third lens groups are movable during zoom-in or zoom-out operation of the miniature zoom lens. In addition, the miniature zoom lens can be composed of at least seven pieces of lens, thus the cost is reduced, the manufacture is easy and the assembly is simple.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.