Sandwich reflection hologram
First Claim
1. A transmission holographic element comprising:
- a) a first planar reflection holographic optical element, the first planar reflection holographic optical element having a first angular bandwidth and residing in a first plane;
b) a second planar reflection holographical optical element, the second planar reflection holographic optical element having a second angular bandwidth, the second reflection holographic optical element residing in a second plane, the second plane residing in a parallel relationship to the first reflection holographic optical element, such that a beam of light passing through the first reflection holographic optical element and being oriented at a first angle to the first plane will be reflected from the second reflection holographic optical element, thereby forming a first reflected beam of light, the first reflected beam of light being reflected from the second reflection holographic optical element toward the first reflection holographic optical element at a second angle, the first reflected beam of light thereafter being reflected from the first reflection holographic element, thereby forming a second reflected beam of light, the second reflected beam of light encountering the second reflection holographic optical element at a third angle, the third angle having an angle of incidence to the second reflection holographic optical element such that the second reflected beam of light passes through the second reflection holographic optical element.
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Accused Products
Abstract
A transmission holographic element (1) composed of a first reflection holographic optical element (2) and a second reflection holographic optical element (3). Reflection holographic optical elements (2,3) are adhesively mated such that the distance separating the two elements is no more than a few wavelengths of the incident light beam (9). The incident light beam (9) passes through first element (2) and is reflected off of the second element (3) which reflects the light beam back towards first element (2) which again reflects the light beam through the second optical element (3). In this manner, two discrete reflection holographic elements (2,3) behave as a single transmission holographic element.
30 Citations
18 Claims
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1. A transmission holographic element comprising:
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a) a first planar reflection holographic optical element, the first planar reflection holographic optical element having a first angular bandwidth and residing in a first plane; b) a second planar reflection holographical optical element, the second planar reflection holographic optical element having a second angular bandwidth, the second reflection holographic optical element residing in a second plane, the second plane residing in a parallel relationship to the first reflection holographic optical element, such that a beam of light passing through the first reflection holographic optical element and being oriented at a first angle to the first plane will be reflected from the second reflection holographic optical element, thereby forming a first reflected beam of light, the first reflected beam of light being reflected from the second reflection holographic optical element toward the first reflection holographic optical element at a second angle, the first reflected beam of light thereafter being reflected from the first reflection holographic element, thereby forming a second reflected beam of light, the second reflected beam of light encountering the second reflection holographic optical element at a third angle, the third angle having an angle of incidence to the second reflection holographic optical element such that the second reflected beam of light passes through the second reflection holographic optical element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An image display device, comprising:
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a) image generating means, the image generating means emitting light; b) a transmission holographic optical element, the transmission holographic optical element comprising; (i) a first reflection holographic optical element, the first reflection holographic optical element residing in a first plane; (ii) a second reflection holographic optical element, the second reflection holographic optical element residing in a second plane, the first and second reflection holographic optical element residing in parallel planes in close proximity to each other so as to behave as a transmission holographic optical element; c) combiner means, the combiner means being positioned so as to intercept emitted light from the image generating means, the combiner means collimating the emitted light so as to reform the image on a plane remote from the combiner means, the combiner means being a transmission holographic optical element. - View Dependent Claims (9, 10, 11, 12)
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13. A method of forming a transmission holographic optical element, comprising the steps of:
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a) creating a first reflection holographic optical element; b) creating a second reflection holographic optical element; and c) placing the first and second holographic optical elements in a proximate relationship, such that the first and second holographic optical elements behave as a transmission holographic optical element. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification