Lens having extended depth of focus, method for designing the same, and optical system having the same
US8102603B2 · kind B2 · utility
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3References
21Claims
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Key dates
| Filing date | May 7, 2009 |
| Grant date | Jan 24, 2012 |
| Priority date | — |
| Expiry date | Jul 31, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The lens includes a plurality of lens layers, each lens layer being axi-symmetric and having an extended depth of focus to focus light in a corresponding section of a focal curve in the form of a straight line located on an optical axis. In the optical system, light is focused on an optical axis to obtain a clear image in a wide distance range between a camera and an object. The optical system has a point spread function that is simpler and more symmetric. That is, the optical system provides improved continuity of a lens surface and easiness and flexibility in optical designing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.