| 摘要 |
PURPOSE:To eliminate sensitivity outside a visual field, prevent deterioration in sensitivity due to a position shift between an opening part and an infrared absorbing layer, and measure infrared-light irradiation area with high accuracy by fixing a pyroelectric element which has the infrared absorbing layer formed on one surface and an electrode on the other surface to a visual field limiting plate which has the opening part nearby the infrared-light absorbing layer side. CONSTITUTION:The pyroelectric element 2 is fixed to the visual field limiting plate 11 which has the opening part 12 of the same size with the infrared-light absorbing layer 1 and the infrared-light absorbing layer 1 and opening part 1 are coincident in position when viewed from an infrared-light incident side. This visual field limiting plate 11 is fixed to a ceramic mount plate 8 and installed in a package 9. The distance between the opening part 12 and infrared-light absorbing layer 1 is a half as large as the thickness of the visual field limiting plate 11, so its visual field limiting effect is sufficient and positioning is easily performed through a microscope. |
