Subminiature optical system
US7289278B1 · kind B1 · utility
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8Claims
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Assignee
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Key dates
| Filing date | Feb 13, 2007 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Feb 13, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A subminiature imaging optical system suitable for a subminiature optical device such as a mobile phone camera. An aperture stop is provided. A first lens has a positive refractive power and is convex at an object side. A second lens has a negative refractive power. A third lens has a positive refractive power. Also, a fourth lens has a negative refractive power. The optical system has a total length along an optical axis direction according to following relation 1:1.2<TL/f<1.5relation 1,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.