JPH0799397B2 - Rain gauge - Google Patents

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]

SUMMARY OF THE INVENTION In the rain gauge of the present invention, however, a plurality of through holes penetrating the rain receiving plate are formed in a rain receiving plate made of an insulating member having a planar surface. A point electrode is provided in this through hole to electrically connect the front surface side and the back surface side of the rain receiving plate, and the end portion on the front surface side of the point electrode becomes the same surface as the surface of the rain receiving plate and each point electrode and its The wiring is provided on the back surface of the rain receiving plate so that the polarities of the adjacent point electrodes 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]

EFFECTS OF THE INVENTION Only a plurality of point electrodes are arranged on the surface of a flat rain receiving plate, and the point electrodes have the same cross-sectional area from the front surface side to the back surface side. The surface area of the point electrode does not change even when the surface is polished or the surface is polished, so that the measurement sensitivity can be kept constant. In addition, there is no fear of damaging the pattern wiring when the stains are wiped off and the surface is polished.

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 flat surface is formed with a large number of through holes penetrating the rain receiving plate, and the front surface side and the back surface side of the rain receiving plate are formed in the through holes. A point electrode that conducts is provided, and the surface side end portion of this point electrode becomes the same surface as the surface of the rain receiving plate, and the rain receiving plate is configured such that each point electrode and its adjacent point electrode have different polarities. A rain gauge characterized by wiring on the back side of the.