Image lens with low chromatic aberration and high resolution
US8477432B2 · kind B2 · utility
10Cited by
1References
12Claims
0Family size
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Key dates
| Filing date | Dec 9, 2011 |
| Grant date | Jul 2, 2013 |
| Priority date | — |
| Expiry date | Dec 13, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image lens for imaging an object on an image plane, in the order from the object side to the image side thereof, includes: a first lens with negative refraction power, a second lens with positive refraction power, a third lens with negative refraction power, a fourth lens with positive refraction power, and a fifth lens. The image lens satisfies the following formula: 0.9<F2/F<1.4; wherein F2 is focal length from the second lens to the fourth lens, F is focal length of the image lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.