Stress relief mechanism for optical interference coatings
First Claim
1. An optical interference coating for reflecting infrared radiation and transmitting visible light comprising alternating layers of high index of refraction material and low index of refraction material, the total number of said layers being greater than 60, said optical interference coating having sufficiently low tensile stress such that said optical interference coating is not susceptible to cohesive failure from tensile stress, each of said alternating layers of high index of refraction material and low index of refraction material being a separate and distinct layer from adjacent layers.
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Abstract
An optical interference coating for reflecting infra-red radiation and transmitting visible light. The coating comprises alternating layers of high index of refraction material and low index of refraction material. As the total number of layers increases, the ratio of high index of refraction material to low index of refraction material must also increase.
12 Citations
32 Claims
- 1. An optical interference coating for reflecting infrared radiation and transmitting visible light comprising alternating layers of high index of refraction material and low index of refraction material, the total number of said layers being greater than 60, said optical interference coating having sufficiently low tensile stress such that said optical interference coating is not susceptible to cohesive failure from tensile stress, each of said alternating layers of high index of refraction material and low index of refraction material being a separate and distinct layer from adjacent layers.
- 10. An electric lamp comprising a light transmissive envelope containing an electric light source within, wherein at least a portion of said envelope is coated with an optical interference coating for reflecting infrared radiation and transmitting visible light radiation, said coating comprising alternating layers of high index of refraction material and low index of refraction material, the total number of said layers being greater than 60, said optical interference coating having sufficiently low tensile stress such that said optical interference coating is not susceptible to cohesive failure from tensile stress, each of said alternating layers of high index of refraction material and low index of reaction material being a separate and distinct layer from adjacent layers.
- 19. An optical interference coating for reflecting infrared radiation and transmitting visible light comprising alternating layers of high index of refraction material and low index of refraction material, each of said alternating layers of high index of refraction material and low index of refraction material being a separate and distinct layer from adjacent layers, the total number of said layers of high index of refraction material and low index of refraction material being greater than 51, wherein a ratio of the total thickness of all of the layers of high index of refraction material to the total thickness of all of the layers of low index of refraction material, r, is at least 0.9.
- 23. An electric lamp comprising a light transmissive envelope containing an electric light source within, wherein at least a portion of said envelope is coated with an optical interference coating for reflecting infrared radiation and transmitting visible light radiation, said coating comprising alternating layers of high index of refraction material and low index of refraction material, each of said alternating layers of high index of refraction material and low index of refraction material being a separate and distinct layer from adjacent layers, the total number of said layers of high index of refraction material and low index of refraction material being greater tan 51, wherein a ratio of the total thickness of all of the layers of high index of refraction material to tho total thickness of all of the layers of low index of refraction material, r, is at least 0.9.
Specification