JPH0457750U

JPH0457750U -

Info

Publication number: JPH0457750U
Application number: JP10013190U
Authority: JP
Priority date: 1990-09-27
Filing date: 1990-09-27
Publication date: 1992-05-18

Description

[Brief explanation of the drawing]

第１図ａ，ｂは本考案実施例の雨滴センサのセ
ンサ部を示す図、第２図は雨滴センサの電気回路
のブロツク図、第３図は雨滴センサの動作のタイ
ムチヤート、第４図は雨滴センサのオフ時の雨滴
付着の有無によるオン時の電極出力の相違を示す
図、第５図はセンサ部に食塩水を滴下して変化を
調べた図、第６図は他の実施例の電気回路のブロ
ツク図、第７図はヒータ加熱温度の変化によるヒ
ータ出力と電極出力の変化を示す図、第８図はセ
ンサ部の温度を変化させたときの電極出力及びヒ
ータ出力の応答波形を示す図、第９図は雨滴セン
サの動作のタイムチヤートである。１……センサ部、２……基板、３……電極、４
……電極、５……ヒータ、１２……タイマー回路
、１３……出力検出手段、２１……タイマー回路
、２２……外部出力手段。 Figures 1a and b are diagrams showing the sensor section of the raindrop sensor according to the embodiment of the present invention, Figure 2 is a block diagram of the electric circuit of the raindrop sensor, Figure 3 is a time chart of the operation of the raindrop sensor, and Figure 4 is A diagram showing the difference in the electrode output when the raindrop sensor is turned on depending on the presence or absence of raindrops when the raindrop sensor is turned off. Figure 5 is a diagram in which saline solution was dropped on the sensor part and the change was investigated. Figure 6 is a diagram showing another example. A block diagram of the electric circuit. Figure 7 is a diagram showing changes in heater output and electrode output due to changes in heater heating temperature. Figure 8 is a diagram showing response waveforms of electrode output and heater output when the temperature of the sensor section is changed. The figure shown in FIG. 9 is a time chart of the operation of the raindrop sensor. 1...Sensor part, 2...Substrate, 3...Electrode, 4
...Electrode, 5...Heater, 12...Timer circuit, 13...Output detection means, 21...Timer circuit, 22...External output means.

Claims

[Claims for Utility Model Registration] (1) It has electrodes facing each other at intervals on the substrate surface, and the presence or absence of raindrops is detected by the change in resistance value between the electrodes due to raindrops adhering between these electrodes. A raindrop sensor that outputs a signal, characterized in that a heater made of an electric resistor is provided on a surface of the substrate opposite to the surface on which the electrode is provided, and the substrate is heated by being energized for a predetermined period of time. Raindrop sensor. (2) a timer circuit that sets the energization time of the heater to a fixed time from the start of operation of the raindrop sensor;
2. The raindrop sensor according to claim 1, further comprising output detection means for outputting a raindrop signal when a resistance value between the electrodes continues at a predetermined value for a certain period of time after the heater is energized. (3) a timer circuit that sets the energization time of the heater to a fixed time from when the resistance value between the electrodes changes and reaches a predetermined value; and a heater resistance based on the resistance value between the electrodes and the temperature change of the heater. 2. The raindrop sensor according to claim 1, further comprising an external output means for determining a raindrop and outputting a raindrop signal when both the value and the value are at a predetermined value after a predetermined time after energization of the heater.