| 摘要 |
PURPOSE: To provide a uniform antireflection coat by vapor deposition on the incident window of an infrared detector in its manufacturing process. CONSTITUTION: An infrared detector is constituted by connecting an outer cylindrical body 1 fitted with an infrared incident window 2 to an inner cylindrical body 5 mounted with an intermediate ring 7 and an infrared detecting element 4. The diameter D and full length of the outer cylindrical body 1 are set in a relation, D>=H, and the solid angleωof the body 1 is set at a large value. At the time of manufacturing the detector, antireflection coats are vapor- deposited on both surfaces of the window 2 while the window 2 is welded to the body 1 and, thereafter, the ring 7 is welded to the body 1 and the inner cylindrical body 5 mounted with the element 4 is welded to the ring 7. Since the solid angleωis set at the large value, the side wall of the outer cylindrical body 1 does not obstruct the vapor deposition of the antireflection coats and the coats are uniformly deposited. In addition, the welding heat generated when the inner cylindrical body 5 is welded to the ring 7 does not affect the element 4, because the welding point is far from the element 4.
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