Lighting device, lens, system and method
First Claim
1. A lighting device comprising at least two optical devices associated with a light source, each optical device comprising a surface with a plurality of micro-sized facets having a size in between 25 μ
- m to 250 μ
m, each facet having a normal vector defining a respective orientation of the facet, an average of the normal vectors for all said plurality of facets in one of the optical devices defining an optical axis for said one of the optical devices;
wherein each of the optical devices is configured to project light from the light source along its optical axis to form an image pattern on a display screen, andwherein the image pattern of one of the optical devices overlaps with the image pattern of another one of the optical devices by superposition,wherein each facet for all of said plurality of facets in one of the optical devices has a tilt angle with respect to the optical axis for said one of the optical devices within a range determined by equation;
α
t<
=0.8*α
c, where α
t is the tilt angle and α
c is a critical angle for total internal reflection.
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0 Petitions
Accused Products
Abstract
A lighting device comprising at least four optical devices. Each optical device has an associated light source and comprises a first surface with a plurality of micro sized facets. Each facet has a respective orientation and said plurality of facets has an optical axis which extends parallel to the normal vector to an average orientation of all said respective orientations. The optical devices are divided over at least two sets of optical devices which are designed to mutually issue a different pattern during operation as the optical devices of different sets are arranged in a mutually alternating manner.
11 Citations
19 Claims
-
1. A lighting device comprising at least two optical devices associated with a light source, each optical device comprising a surface with a plurality of micro-sized facets having a size in between 25 μ
- m to 250 μ
m, each facet having a normal vector defining a respective orientation of the facet, an average of the normal vectors for all said plurality of facets in one of the optical devices defining an optical axis for said one of the optical devices;wherein each of the optical devices is configured to project light from the light source along its optical axis to form an image pattern on a display screen, and wherein the image pattern of one of the optical devices overlaps with the image pattern of another one of the optical devices by superposition, wherein each facet for all of said plurality of facets in one of the optical devices has a tilt angle with respect to the optical axis for said one of the optical devices within a range determined by equation;
α
t<
=0.8*α
c, where α
t is the tilt angle and α
c is a critical angle for total internal reflection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- m to 250 μ
-
13. A lighting device, comprising:
-
a light source for emitting light; a first optical device having a first surface with a plurality of first facets; and a second optical device having a second surface with a plurality of second facets; wherein each of the first and second facets has a normal vector defining an orientation thereof, an average of the normal vectors for the first facets defining an optical axis of the first optical device, and an average of the normal vectors for the second facets defining an optical axis of the second optical device; wherein the first optical device projects the light from the light source along said optical axis of the first optical device to form a first pattern on a display screen; wherein the second optical device projects the light from the light source along said optical axis of the second optical device to form a second pattern on the display screen; wherein the first and second patterns overlap by superposition; and wherein each of the first and second facets has a tilt angle relative to the optical axes of the first and second optical devices, respectively, where the tilt angle is within a range determined by equation α
t<
=0.8*α
c, where α
t is the tilt angle and α
c is a critical angle for total internal reflection. - View Dependent Claims (14, 15, 16, 17, 18)
-
-
19. A lens comprising at least two sets of optical elements, wherein the at least two sets of optical elements are designed to project different image patterns on a display screen during operation, wherein the different image patterns overlap by superposition, and wherein different sets of the optical elements are arranged neighboring one another in a mutually alternating manner, and at least one set of the at least two sets of optical elements comprises a plurality of facets, each facet having a tilt angle relative to an optical axis of the lens within a range determined by equation:
- α
t<
=0.8*α
c, where α
t is the tilt angle and α
c is a critical angle for total internal reflection.
- α
Specification