| 摘要 |
PURPOSE:To improve detection precision and facilitate production, by reducing the outside diameter in one side of the metal ring-form support stand and by causing the pyroelectric element with electrodes on both faces to adhere to this stand. CONSTITUTION:Step part 13 is provided in one side of metal ring-form support stand 12 to reduce the outside diameter. Pyroelectric element 10 with electrodes on both faces is caused to adhere to the part between steps 13 of this metal ring 12, thus obtaining a pyroelectric unit. The opposite polarity is given to one of these pyroelectric units 900 and 902, and they are superposed with reflective plate 901 interposed and are stored in the case of the detector. By the lamination effect with the opposite polarity, not only temperature compensation is obtained but also the noise voltage of vibration, noise shock, and so on generated by the piezoelectric characteristic of these elements is cancelled. |
