Imaging lens and imaging system
US8259210B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2011 |
| Grant date | Sep 4, 2012 |
| Priority date | — |
| Expiry date | Apr 27, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/004
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The spherical aberration of an imaging lens changes from an object side of image-plane base position Zo toward the other side thereof as a distance from optical axis Z1 increases, and formulas 0.02<a/f<0.10 and 0.02<b/f are satisfied. In an imaging apparatus to which the imaging lens is applied, a blur is corrected by performing contrast recovery processing on original image data obtained by imaging. In the formulas, a is the magnitude of spherical aberration from the image-plane base position Zo toward the object side thereof affecting a ray passing through a central part of the pupil of the imaging lens, and b is a sum of a maximum spherical aberration from the image plane base position Zo toward the object side thereof and a maximum spherical aberration from the image plane base position Zo toward the other side thereof, and f is the focal length of the imaging lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.