JPH06174857A - Precipitation detector - Google Patents

Abstract

PURPOSE:To maintain the measuring sensitivity of the precipitation detector against cleaning and polishing and to prolong the life of the detector by providing a plurality of through holes bored through a rain plate with point electrodes that communicate the front and back of the rain plate with each other, and providing adjacent electrodes with different polarity. CONSTITUTION:A through hole 5 formed through a rain plate 2 is plated with copper foil 7 at the inner peripheral surface thereof to communicate the front 3 and back 6 of the rain plate 2 with each other and a space in the copper foil 7 is filled with solder plating 8 to form point electrodes 4. The plurality of electrodes 4 formed on the surface 3 comprise positive point electrodes 10 for connection to positive pole pattern wiring 12 and negative point electrodes 11 for connection to negative pole pattern wiring 13, which are alternately disposed, and so when water droplets attach to the surface 3 the resistance between the electrodes fluctuates, allowing detection of rainfall. When the surface 3 is wiped or polished the surface area of the electrodes 4 is not varied, so measuring sensitivity can be held constant, and since the wiring 12, 13 is formed on the back, scratch is prevented and the life of the pluviometer is prolonged since the wiring 12, 13 itself is not polished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rain gauge which senses rainfall by providing a rain plate with a pair of electrodes and detecting a change in resistance between the electrodes.

[0002]

2. Description of the Related Art A conventional rain gauge, as shown in FIG. 5, has a positive electrode arranged in a comb shape on a rain receiving plate 100 formed of an insulating member so that adjacent electrodes have different polarities. The pattern wiring 110 and the negative electrode pattern wiring 120 are alternately formed, and the change in the resistance value between the electrodes caused by the deposition of raindrops on the rain receiving plate 100 is detected to detect the rainfall.

The positive electrode pattern wiring 110 and the negative electrode pattern wiring 120 are usually plated to prevent corrosion by raindrops or acid substances contained in the raindrops, and a plating film 130 is formed.

[0004]

However, in the rain gauge described above, if dirt or the like adheres to the surface of the rain receiving plate 100, the resistance between the electrodes changes, which causes a malfunction. In order to solve the problem, conventionally, the surface of the rain catching plate 100 is frequently wiped with a cloth or the like, and if the dirt is hard to remove, it is sanded with sandpaper or the like.

Further, the surface electrodes (positive electrode pattern wiring and negative electrode pattern wiring) formed on the rain receiving plate 100 of the rain gauge are easily worn by the above-mentioned wiping work and polishing work, and the electrode of the worn portion There is a problem that a detection error occurs due to the change of the surface area, and a problem that the life of the rain gauge is shortened.

Therefore, the present invention is to provide a rain gauge capable of maintaining the measurement sensitivity for cleaning and polishing the surface of the rain gauge and extending the life of the rain gauge.

[0007]

Therefore, the present invention is
A rain plate made of an insulating member having a predetermined shape is formed with a plurality of through holes that conduct the rain plate, and a point electrode that connects the front surface side and the back surface side of the rain plate is provided in the through hole. The wiring is provided on the back surface of the rain plate so that the polarities of the electrodes adjacent to the point electrode are different.

[0008]

According to the present invention, therefore, the through holes formed in the rain receiving plate are provided with the point electrodes that connect the front surface side and the back surface side of the rain receiving plate so that the adjacent point electrodes have different polarities. Since the electrodes are wired on the back side of the rain plate, it is possible to detect rainfall as in the conventional case, and since only the point electrodes are arranged on the surface of the rain plate,
The above problem can be achieved without changing the surface area of the point electrode due to the polishing of the surface.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

The basic structure of the rain gauge will be described with reference to FIG.
A rain receiving portion 100 having 13, an oscillator (OSC) 110 connected to one electrode of the rain receiving portion 100, a resistor 120 connected to the other electrode of the rain receiving portion 100, and an end of this resistor. Amplifier that amplifies the voltage generated in the
P) 130 and a comparator 140 for comparing the amplified signal with a predetermined voltage,
The variation of the resistance value between the electrodes, which occurs when raindrops adhere to both electrodes 12 and 13 of the rain receiving part 100, is applied to the amplifier 13
0 and the comparator 140 detect and output the signal which shows rainfall.

The rain receiving portion 100 of the rain gauge, as shown in FIGS. 2 to 4, has a rain receiving plate 2 made of a disk-shaped insulating member, and a surface of the rain receiving plate 2. 3 and the point electrode 4 formed on it.

The point electrode 4 is formed by plating a copper foil 7 which connects the front surface 3 and the back surface 6 of the rain receiving plate 2 to the inner peripheral surface of a through hole 5 formed through the rain receiving plate 2. It is formed by filling the space in the copper foil 7 with the solder plating 8. Solder plating 8
Instead of, it may be filled with other plating.

On the back surface 6 of the rain plate 2, the point electrode 4 is provided.
Comb-shaped positive electrode pattern wirings 12 that communicate the end portions on the back surface side of the same in alternate rows and comb-shaped negative electrode pattern wirings 13 that communicate the point electrodes 4 between the positive electrode pattern wirings 12 in alternate rows. Are formed, the positive electrode pattern wiring 12 is connected to the oscillator 110 via a terminal 14, and the negative electrode pattern wiring 13 is connected to the resistor 120 via a terminal 15.

As a result, the plurality of point electrodes 4 formed on the surface 3 of the rain receiving plate 2 are connected to the positive electrode pattern wiring 12 in one direction (oblique direction).
And negative point electrodes 11 connected to the negative electrode pattern wiring 13 are alternately arranged.
When a raindrop adheres to the surface 3 of the device due to rainfall, the resistance between the electrodes fluctuates, so that the rainfall can be detected. In this embodiment, the positive electrode pattern wirings 12 and the negative electrode pattern wirings 13 are alternately arranged diagonally because one point electrode 4 and the nearest point electrode 4 adjacent thereto, in other words, one point electrode This is to make the polarities of the point electrodes 4 adjacent to each other vertically and horizontally different.

Further, in the rain receiving plate 2 having the above structure, even when dirt or the like adheres to the surface 3 of the rain receiving plate 2 and the surface 3 is wiped with a cloth or sanded with sandpaper or the like. Since the surface area of the electrode is the same as that before polishing, the measurement sensitivity does not change. Further, since the pattern wirings 12 and 13 are formed on the back surface, the pattern wirings are not damaged during the polishing, and dirt or the like is not attached to the pattern wirings. Therefore, the pattern wirings are corroded or damaged. It is possible to prevent variation in measurement sensitivity due to factors such as the above.

[0016]

As described above, in the present invention, a plurality of point electrodes penetrating the rain receiving plate are provided, and the adjacent electrodes of the point electrodes are formed so as to have different polarities.
Only a plurality of point electrodes will be placed on the surface of the rain plate, and even when wiping dirt off the surface or polishing the surface, the surface area of the point electrode does not change, so the measurement sensitivity is constant. Is something that can be kept at. In addition, there is no fear of damaging the pattern wiring when wiping the dirt and polishing the surface.

Furthermore, since the pattern wiring itself is not polished, the service life of the electrode is extended, and the service life of the rain gauge itself is also extended.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing a configuration of a rain gauge.

FIG. 2 is a plan view of a rain plate of the rain gauge.

FIG. 3 is a bottom view of a rain plate of the rain gauge.

FIG. 4 is a partially enlarged sectional view of a rain plate.

FIG. 5 is a partially enlarged sectional view of a conventional rain plate.

[Explanation of symbols]

 2 Rain plate 3 Front surface 4 Point electrode 5 Through hole 6 Back surface 7 Copper foil 8 Solder plating or other plating 10 Positive point electrode 11 Negative point electrode 12 Positive electrode pattern wiring 13 Negative electrode pattern wiring

Claims (1)

[Claims] 1. A rain receiving plate made of an insulating member having a predetermined shape is provided with a plurality of through holes penetrating the rain receiving plate, and the front surface side and the back surface side of the rain receiving plate are electrically connected to the through holes. A rain gauge characterized in that a point electrode is provided, and wiring is provided on the back surface of the rain receiving plate so that the polarities of the electrodes adjacent to the point electrode are different.