| 摘要 |
<p>A pyroelectric body (11) which senses infrared rays is contained in a case consisting of a can (4) and a stem (5) both made of an alloy having a composition of 55 % Fe, 28 % Ni and 17 % Co. A filter (2) for closing a window (1) which is provided so as to introduce infrared rays into the interior of the case is fixed to the periphery of the window with a fusion material (3) such as silver solder. On the upper and lower surfaces of the pyroelectric body formed are an electrode for absorbing infrared rays and an electrode for leading out an electric signal representing the detection of infrared rays to a conductive bonding agent. The absorption electrode is a thin layer of an infrared ray absorbing material; the take-out electrode is of the same material, or of a corrosion-resisting material, and is a layer thicker than that of the absorption electrode. Terminal pins (6, 7, 8) extending from the interior to the exterior of the case so as to take an electric signal representing the detection of infrared rays to the outside are provided with flat collars (17) projecting radially in the vicinity of the inner ends of the pins. A printed board (15) used to process the electric signal in the interior of the case is supported stably and in parallel with the collars.</p> |
