The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 2017
Filed:
Nov. 16, 2006
Markku Kuittinen, Joensuu, FI;
Pasi Laakkonen, Joensuu, FI;
Markku Kuittinen, Joensuu, FI;
Pasi Laakkonen, Joensuu, FI;
NANOCOMP OY LTD., Lehmo, FI;
Abstract
An arrangement () for coupling light into a plate-like guide () having two surfaces () on opposite sides of the light guide comprises an in-coupling diffraction grating () for diffracting an external light beam () incident on said in-coupling diffraction grating into the light guide in a direction enabling the in-coupled light beam to propagate within the light guide via total internal reflections at the light guide surfaces (). According to the present invention, the arrangement further comprises a deflection member () arranged to deflect the beam () initially diffracted by the in-coupling diffraction grating (), before it hits the in-coupling diffraction grating again, out of the path determined by the in-coupling diffraction grating in order to reduce out-coupling of the already in-coupled light through the in-coupling diffraction grating.