| 摘要 |
PURPOSE:To obtain an infrared detector which causes no shading, etc., by using an absorption type filter formed by vapor-depositing a thin film of a material absorbing light in a nontransmission range on the surface of a parallel plane plate. CONSTITUTION:An infrared detecting element 1 is arranged in a vacuum dewer 2 with an infrared transmission widow. The parallel plate 10 is formed of the same material with the window 7 as to infrared rays. The absorbing thin film 11 is obtained by forming an optical material which is nontransmission to <=lambda1 wavelength substantially by a means for vapor deposition, etc. Reflection preventive films 12 and 13 are vapor-deposited on the thin 11 and plane plate 10. Consequently, light in the nontransmission range is absorbed, so infrared light emitted in the dewer 2 is not reflected again intensely to the element 1. Consequently, the infrared detector which causes no shading, etc., is obtained.
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