| 摘要 |
PURPOSE:To prevent erroneous detection due to the movement of the rain drops along a dielectric body, by arranging comb-tooth shaped unit electrodes attached onto the back of a dielectric body that those sandwiched by other unit electrodes are given a shape having a specified detection gap with respect to other unit electrodes adjoining on both sides thereof. CONSTITUTION:A case 1 is mounted on a bonnet of an automobile with window sections 1a and 1b forward. Rectangular plate shaped dielectric bodies 7 and 7 are arranged in the case 1 facing the window sections 1a and 1b and electrodes 8 and 9 are attached onto the back of dielectric bodies 7 and 7. The electrodes 8 and 9 are divided into comb-tooth pattern shaped unit electrodes 8a, 8b and 8c and 9a, 9b and 9c and the electrodes 8a-8c and 9a-9c are meshed with a gap (G). Among the electrodes 8a-8c and 9a-9c those 8b, 8c and 9a, 9b sandwiched by other unit electrodes extend electrode pointers both to the right and left to be given a shape with the clearance (G) with respect to other unit electrode adjoining on both sides thereon. Thus, rain drops are detected from changes in the electrostatic capacitance between the electrodes 8 and 9, thereby preventing erroneous detection.
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