Method of forming a freeform surface shaped element for an illumination system
US9818223B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 12, 2015 |
| Grant date | Nov 14, 2017 |
| Priority date | — |
| Expiry date | May 12, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F17/10
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A construction method of freeform surface shape based on XY-polynomial obtains a plurality of data points of a freeform surface according to an object point and an imaging point in a three-dimensional Cartesian coordinates system Oxyz. Each of the plurality of data points comprises a coordinate value Qi and a normal vector Ni. A first sum of squares e1(P) of coordinate differences in z direction between the coordinate value Qi and the freeform surface is applied, and by a second sum of squares e2(P) between the normal vector Ni of the data points and a normal vector ni of the freeform surface, a modulus of vector differences is acquired. An evaluation function ƒ(p)=e1(P)+we2(P) is proposed and a plurality of freeform surface shapes obtained by selecting and applying different weightings. A final freeform surface shape Ωopt is chosen from the plurality of freeform surface shapes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.