Diffractive combiner for multicolor and monochrome display, method of manufacture and head-up display device using same
US8477424B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 9, 2009 |
| Grant date | Jul 2, 2013 |
| Priority date | — |
| Expiry date | May 14, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2222/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for producing a single-layer diffractive combiner for a head-up display having a projection unit with n light sources of λi wavelength(s), where i=1 to n sending light towards the combiner at an angle θp. The method includes forming interference fringes for each λi wavelength on a photosensitive layer with an interference of two light beams from a single laser source of wavelength λe, where the forming step is repeated n times, and each time the forming step is repeated an angle θi between the two beams is determined according to θi=arcsin ((λe/λi)*sin(θp)), one of the interfering beams being divergent and having a spherical wave front and the other being a plane wave, the interference of the beams generating a diffractive network with an adjustable pitch and curved contour fringe lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.