Lighting lens for biometric measurement device
US9719661B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | Mar 30, 2015 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | May 26, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B17/086
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting lens for a biometric measurement device comprises a paraboloidal or ellipsoidal reflector with symmetry of revolution, and a dioptric surface that has two different refractive power values in two perpendicular directions, said two refractive power values being negative or zero. Such a lens can be produced in the form of a block of transparent material and be used in a biometric measurement device. In particular, it makes it possible to capture skin prints as an image with an exposure time that is short.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.