Zoom lens and imaging device using same
US8456749B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 21, 2011 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Nov 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a zoom lens for imaging an object on an imaging surface. The zoom lens includes, in the order from an object side to an image side thereof, 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 includes a first surface. The zoom lens satisfies the formula: 0.15<|L3|/Lt<0.25, where L3 is a distance of the movement of the third lens group along an optical axis of the zoom lens when the zoom lens is switched between a wide-angle state and a telephoto state, and Lt is a distance from the first surface to the imaging surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.