| 摘要 |
<p>PURPOSE:To enlarge a warning range per device and to increase the stability of the device by using four pairs of pyroelectric elements so that the arranging direction of two pairs of 1st elements may be orthogonally crossed with that of two pairs of 2nd elements. CONSTITUTION:In the representative arrangement of sensitive electrode part, (a) and (b), (c) and (d), (e) and (f), and (g) and (h) in figure K are respectively paired and two pairs, (a) and (b), and (c) and (d), are arranged in an X-axis direction and two pairs, (e) and (f), and (g) and (h), are arranged in a Y-axis direction. As concerns a polarity, that means, which signal is outputted for the increase of incident energy, a positive one or a negative one, (a), (d), (f) and (g) are negative and (b), (c), (e) and (h) are positive. The pair of (a) and (b) and the pair of (c) and (d) are connected in parallel, but the same effect is obtained even by connecting two pairs of elements(four elements) in series. As to the pair of (e) and (f) and the pair of (g) and (h), the same effect is obtained in the same way. Thus, a signal is outputted from at least two or more pairs of elements out of four pairs of elements whatever direction a substance moves, and the unevenness of detection sensitivity caused by a direction is eliminated in the same way as a one-element type pyroelectric element.</p> |
