| 摘要 |
PURPOSE:To improve the durability of an apparatus, by attaching first and second electrodes which are divided into a plurality of unit electrodes on the back of a dielectric body formed like a plate at a specified interval therebetween to detect changes in the electrostatic capacity due to rain drops attached onto the surface of the electric body. 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 the dielectric bodies 7 and 7. The electrodes 8 and 9 are divided into unit electrodes 8a, 8b and 8c and 9a, 9b and 9c and the electrodes 8a-8c are faced with 9a-9c at a specified interval therebetween. A rain drop sensor 12 is formed with the case 1, the dielectric body 7 and the electrodes 8 and 9 and changes in the electrostatic capacity between the electrodes 8 and 9 according to the attachment of rain drops to the surface of the dielectric body 7 are inputted into a detection circuit through external capacitor, thereby enabling higher durability of a rain drop detector.
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