| 摘要 |
PROBLEM TO BE SOLVED: To make it difficult to make a flaw in vapor-deposited film by housing an infrared lens and an image pick up part in a case, connecting a window arranged on the infrared incident side of an infrared lens to the case and laminate-constituting the window with alkali halide or alkaline earth halide or a semiconductor, or a first layer made of chalcogenide glass and a second layer made of polymer material. SOLUTION: An image is formed by converging light by an infrared lens 2 and an infrared video image-formed by the lens 2 is converted to an electric signal by an image forming part 3. The lens 2 and the part 3 are housed in a case 4 and a window is provided on the incident side of the lens 2. Material constituting the window is laminate-structured and the first layer 5 of the laminated structure is alkali halide or alkaline earth halide or a semiconductor, or chalcogenide glass. The second layer 6 of the window consists of polymer material such as polyethylene having a property of transmitting infrared rays. |
