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    • 1. 发明专利
    • RAIN DROP DETECTOR
    • JPS62179651A
    • 1987-08-06
    • JP2091286
    • 1986-01-31
    • TOYOTA MOTOR CORPTOKAI RIKA CO LTD
    • IYODA NORIBUMIOOTA ATSUSHIMUTO MASAHITOARAO UMEOHAYASHI SHIGERUKUBOTA KAZUHISA
    • G01N27/22B60S1/08G01N27/00
    • PURPOSE:To make a response to the lowering of detection sensitivity, by detecting variations in impedance between electrodes which are divided into a plurality of unit electrodes and attached onto the back of a dielectric body at specified intervals therebetween to generate an abnormality signal when the variations exceed a fixed limit range. CONSTITUTION:A case 1 is mounted to a bonnet of an automobile with window sections 1a and 1b forward. Rectangular plate shaped dielectric bodies 7 and 7 are arranged in a case 1 facing windows 1a and 1b and electrodes 8 and 9 divided into respective unit electrodes are attached onto the backs of the dielectric bodies 7 and 7. Variations in the impedance between the electrodes 8 and 9 corresponding to the amount of rain drops attached are detected with a detection circuit 13 and applied to a microcomputer 32 of a control circuit 30 as a frequency signal Sf. On the basis of the signal Sf, the computer 32 controls a relay 35 for switching the expanded wiping mode of a wiper and a relay 36 for controlling the driving of the wiper while an abnormality signal S3 is outputted when the frequency increment of the signal Sf exceeds a set limit range. The signal S3 enables a countermeasure against the decrease of the detection sensitivity.
    • 2. 发明专利
    • RAIN DROP DETECTOR
    • JPS62179649A
    • 1987-08-06
    • JP2091086
    • 1986-01-31
    • TOYOTA MOTOR CORPTOKAI RIKA CO LTD
    • IYODA NORIBUMIOOTA ATSUSHIMUTO MASAHITOARAO UMEOHAYASHI SHIGERUKUBOTA KAZUHISA
    • G01N27/22B60S1/08G01N27/00
    • 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.
    • 3. 发明专利
    • RAIN DROP DETECTOR
    • JPS62179648A
    • 1987-08-06
    • JP2090986
    • 1986-01-31
    • TOYOTA MOTOR CORPTOKAI RIKA CO LTD
    • IYODA NORIBUMIOOTA ATSUSHIMUTO MASAHITOARAO UMEOHAYASHI SHIGERUKUBOTA KAZUHISA
    • G01N27/22B60S1/08G01N27/00
    • 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.
    • 6. 发明专利
    • RAIN DROP DETECTOR
    • JPS62179650A
    • 1987-08-06
    • JP2091186
    • 1986-01-31
    • TOYOTA MOTOR CORPTOKAI RIKA CO LTD
    • IYODA NORIBUMIOOTA ATSUSHIMUTO MASAHITOARAO UMEOHAYASHI SHIGERUKUBOTA KAZUHISA
    • G01N27/22B60S1/08G01N27/00
    • PURPOSE:To inhibit effect of the difference in the specific resistance of rain drops attached, by setting the oscillation frequency of an oscillation circuit so that a capacitance reactance due to an electrostatic capacitance via rain drops attached between a pair of electrodes will be larger than the resistance of the attached rain drops themselves. 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 windows 1a and 1b and paired electrodes 8 and 9 are attached on to the back of the dielectric bodies 7 and 7. A rain drop sensor 12 which varies in the impedance between electrodes 8 and 9 with difference in the amount of rain drops attached is formed and the amount of rain drops attached are detected on the basis of variation in the cycle of a frequency signal Sf from an oscillation circuit 13 which varies in the oscillation frequency with the impedance of the sensor 12. The oscillation frequency of the circuit 13 is set so that a capacitance reactance due to an electrostatic capacitance through the rain drops attached between the electrodes 8 and 9 will be larger than the resistance of the attached rain drops themselves, thereby inhibiting effect of the difference in the specific resistance of the rain drops attached.