Title:
Nia iddy spray
Document Type and Number:
Japanese Patent JP6190884
Kind Code:
B2
Abstract:
The invention relates to optical devices comprising a transparent substrate and a first transparent grating layer on the substrate, the grating layer comprising periodically alternating zones having different refractive indices. According to the invention, the device comprises a second transparent grating layer located on top of the first grating layer and also comprising periodically alternating zones having different refractive indices so that the zones of the first grating layer having higher refractive index are at least partly aligned with the zones of the second grating layer having lower refractive index and vice versa, the second grating layer reducing the amount of light diffracted to non-zero transmission orders. The invention allows for reducing the so-called rainbow effect for example in head-up displays (HUDs).
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Inventors:
Anti Sunnari
Orli-Heikki Footunen
Yuso Orukkonen
Orli-Heikki Footunen
Yuso Orukkonen
Application Number:
JP2015532479A
Publication Date:
August 30, 2017
Filing Date:
September 18, 2013
Export Citation:
Assignee:
Dispelix Oy
International Classes:
G02B5/18; G02B27/01; G02B27/02; G02B27/44
Domestic Patent References:
| JP58500916A | ||||
| JP8271712A | ||||
| JP2008070867A | ||||
| JP2010243786A | ||||
| JP2165023A |
Foreign References:
| US20100091369 | ||||
| EP1767964A1 | ||||
| US20070263285 | ||||
| US20070081246 | ||||
| WO2011113662A1 | ||||
| EP2196842A1 | ||||
| US20090245730 | ||||
| EP2244114A1 |
Attorney, Agent or Firm:
Kenji Sugimura