Optical system furnished with a device for increasing its depth of field
US8270083B2 · kind B2 · utility
4Cited by
1References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2008 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | Jan 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/001
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
To increase the depth of field of an optical system, an inversion of the chromatism is produced. This accommodates the fact that, in natural light, users prefer, for their photographs, taking long distance shots outdoors, where the illuminant is mostly composed of blue, and short-distance shots indoors, where the illuminant is mostly composed of red. While optical devices naturally focus the blue components at a shorter distance than the red components, which is unfavorable, with an inversion of the chromatism, a focus more in keeping with what is required is restored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.