DOUBLE-SIDED IMAGING LIGHT GUIDE WITH EMBEDDED DICHROIC FILTERS
First Claim
1. An imaging light guide comprising:
- a waveguide formed as a substrate having a first surface with a first surface coating and a second surface, opposite the first surface and having a second surface coating;
a first in-coupling diffractive optic formed on the first surface coating and oriented to direct a first beam of diffracted light of a first wavelength range into the waveguide along a first direction;
a second in-coupling diffractive optic formed on the second surface coating and oriented to direct a second beam of diffracted light of a second wavelength range into the waveguide along a second different direction;
a first dichroic patch located between the first surface of the substrate and the first surface coating and formed to;
(i) transmit light of the first wavelength range,(ii) transmit light of the second wavelength range through a limited range of incidence angles, and(iii) reflect light of the second wavelength range through a higher range of incidence angles; and
a second dichroic patch located between the second surface of the substrate and the second surface coating and formed to transmit light of the second wavelength range and reflect light of the first wavelength range.
1 Assignment
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Accused Products
Abstract
An imaging light guide has a waveguide formed as a coated substrate having first and second surface coatings. A first in-coupling diffractive optic on the first coating directs diffracted light of a first wavelength range into the waveguide along a first direction. A second in-coupling diffractive optic on the second coating directs diffracted light of a second wavelength range into the waveguide along a second different direction. A first dichroic patch between the first surface of the substrate and the first surface coating for (a) transmitting the first wavelength range, (b) transmitting the second wavelength range through a range of incidence angles, and (c) reflecting the second wavelength range through a higher range of incidence angles. A second dichroic patch between the second surface of the substrate and the second surface coating for transmitting the second wavelength range and reflecting the first wavelength range.
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Citations
12 Claims
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1. An imaging light guide comprising:
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a waveguide formed as a substrate having a first surface with a first surface coating and a second surface, opposite the first surface and having a second surface coating; a first in-coupling diffractive optic formed on the first surface coating and oriented to direct a first beam of diffracted light of a first wavelength range into the waveguide along a first direction; a second in-coupling diffractive optic formed on the second surface coating and oriented to direct a second beam of diffracted light of a second wavelength range into the waveguide along a second different direction; a first dichroic patch located between the first surface of the substrate and the first surface coating and formed to; (i) transmit light of the first wavelength range, (ii) transmit light of the second wavelength range through a limited range of incidence angles, and (iii) reflect light of the second wavelength range through a higher range of incidence angles; and a second dichroic patch located between the second surface of the substrate and the second surface coating and formed to transmit light of the second wavelength range and reflect light of the first wavelength range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification