Title:
導波路構造
Document Type and Number:
Japanese Patent JP6736695
Kind Code:
B2
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.
Inventors:
Marshall, Ian
Application Number:
JP2018563464A
Publication Date:
August 05, 2020
Filing Date:
May 31, 2017
Export Citation:
Assignee:
BAE SYSTEMS plc
International Classes:
G02B27/02; G02B5/18; G02B6/124; G02B27/01; H04N5/64
Domestic Patent References:
| JP2007011057A | ||||
| JP2015184385A | ||||
| JP2005504339A | ||||
| JP2011146185A |
Foreign References:
| WO2016054092A1 | ||||
| WO2016020643A1 |
Attorney, Agent or Firm:
Kurata Masatoshi
Nobuhisa Nogawa
Naoki Kono
Tadashi Inoue
Shigeru Iino
Sanae Kaneko
Nobuhisa Nogawa
Naoki Kono
Tadashi Inoue
Shigeru Iino
Sanae Kaneko