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:
Oct. 06, 2020
Filed:
May. 31, 2017
Applicant:
Bae Systems Plc, London, GB;
Inventor:
Ian Marshall, Rochester Kent, GB;
Assignee:
BAE SYSTEMS PLC, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/10 (2006.01); G02B 6/12 (2006.01); G02B 27/01 (2006.01); G02B 6/00 (2006.01);
U.S. Cl.
CPC ...
G02B 27/0101 (2013.01); G02B 6/00 (2013.01); G02B 6/105 (2013.01); G02B 6/12 (2013.01); G02B 2006/12104 (2013.01); G02B 2006/12116 (2013.01);
Abstract
An optical waveguide device for use in a head up display. The waveguide device provides pupil expansion in two dimensions. The waveguide device comprise a primary waveguide and a secondary waveguide, the secondary waveguide being positioned on a face of the primary waveguide. The secondary waveguide has a diffraction grating on a face opposite to the face which contacts the primary waveguide. The diffraction grating diffracts light into more than diffraction order. Rays diffracted into a non-zero order are trapped in the secondary waveguide by total internal reflection.