Wide-angle zoom lens and camera module using same
US8749613B2 · kind B2 · utility
1Cited by
1References
16Claims
0Family size
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Key dates
| Filing date | Apr 19, 2011 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | Nov 18, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide-angle zoom lens includes a first lens group with positive refraction power, a second lens group with negative refraction power, a third lens group with positive refraction power, and a fourth lens group with positive refraction power. The first lens group, the second lens group, the third lens group, and the fourth lens group move along an optical axis of the zoom lens in focusing. The wide-angle zoom lens satisfies the formulas: 1.6<f3/fw<2.1, where f3 is the effective focal length of the third lens group, and fw is the effective focal length of the wide-angle zoom lens in a wide angle state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.