Infrared transparent optical element and infrared imaging camera using the same
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsShintaro Minami, Osamu Hayashi, Takayuki Nakano, Yasuhisa Tamagawa, Makoto Kamozawa, Tetsuyuki Kurata
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Abstract
An infrared transparent optical element for use as an optical window for an infrared imaging camera includes an infrared transparent substrate, an antireflection film, and a protective film of a polymer material. The infrared transparent substrate has first and second major surfaces opposite each other, and the antireflection film is disposed on each of the first and second major surfaces of the substrate. The protective film is on an outer surface of the antireflection film on the first major surface of the substrate.
Claims14
An infrared transparent optical element for use as an optical window for an infrared imaging camera, the infrared transparent optical element comprising:
- an infrared transparent substrate having first and second major surfaces opposite to each other, wherein infrared light emanating from an object enters the infrared transparent substrate through the first major surface and emerges outwardly from the infrared transparent substrate through the second major surface;
- an antireflection film on each of the first and second major surfaces of the substrate;
- and
- a protective film made of an ultrahigh molecular weight, high density polyethylene having a weight-average molecular weight not smaller than 1,600,000, the protective film being disposed on an outer surface of the antireflection film that is on the first major surface of the substrate.
The infrared transparent optical element, for use as an optical window for an infrared imaging camera, the infrared transparent optical element comprising:
- an infrared transparent substrate having first and second major surfaces opposite to each other, wherein infrared light emanating from an object enters the infrared transparent substrate through the first major surface and emerges outwardly from the infrared transparent substrate through the second major surface;
- an antireflection film on each of the first and second major surfaces of the substrate;
- a metal mount enclosing the infrared transparent substrate and in contact with a peripheral side face of the infrared transparent substrate;
- and
- a protective film made of a polymer material and on an outer surface of the antireflection film that is on the first major surface of the substrate, wherein the protective film comprises a high density layer on the antireflection film and a low density layer on the high density layer, wherein the protective film is partly sandwiched between the peripheral side face of the infrared transparent substrate and the metal mount.
An infrared transparent optical element for use as an optical window for an infrared imagine camera, the infrared transparent optical element comprising:
- an infrared transparent substrate having first and second major surfaces opposite to each other, wherein infrared light emanating from an object enters the infrared transparent substrate through the first major surface and emerges outwardly from the infrared transparent substrate through the second major surface;
- an antireflection film on each of the first and second major surfaces of the substrate;
- and
- a protective film made of a polymer material and on an outer surface of the antireflection film that is on the first major surface of the substrate, wherein the protective film comprises a high density layer on the antireflection film and a low density layer on the high density layer.
Dependencies are inferred from the claim text.