Optical device, and virtual image display device

Details Optical device, and virtual image display device Optical device, and virtual image display device

2011-05-06

2011-12-06

Healy, Brian M. (Department: 2883)

Optical waveguides

With optical coupler

Input/output coupler

C359S015000, C359S016000, C359S017000, C359S019000, C359S032000, C359S033000, C359S034000

Reexamination Certificate

active

08073296

ABSTRACT:
A virtual image display device which displays a two-dimensional image for viewing a virtual image in a magnified form by a virtual optical system. The virtual image display device includes an optical waveguide to guide, by internal total reflection, parallel pencil groups meeting a condition of internal total reflection, a first reflection volume hologram grating to diffract and reflect the parallel pencil groups incident upon the optical waveguide from outside and traveling in different directions as they are so as to meet the condition of internal total reflection inside the optical waveguide and a second reflection volume hologram grating to project the parallel pencil groups guided by internal total reflection inside the optical waveguide as they are from the optical waveguide by diffraction and reflection thereof so as to depart from the condition of internal total reflection inside the optical waveguide. Some of the parallel pencil groups guided through the optical waveguide being totally reflected different numbers of times for a period from external incidence upon the optical waveguide until outgoing from the optical waveguide.

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Japanese Office Action issued on Sep. 13, 2011 in connection with counterpart JP Application No. 2006-519459.

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