JPH0692949B2 - Rain sensor for buildings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the opening and closing operation of an opening by windows and skylights, and the operation of putting in and out of clothes etc. according to the presence or absence of rainfall. Regarding the rain sensor.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view showing an example of a conventional rain sensor used for the above-mentioned skylight and the like. For example, a pair of electrodes 2a and 2b are fixed on a resin substrate 1 by adhesion or the like.
The substrate 1 is fixed on a table 3, and electrodes 2a, 2
b is a nickel plate layer 5 on the copper plate 4 as shown in FIG.
And a gold plating layer 6 are formed.

[0003]

However, according to the above-mentioned conventional rain sensor, at the boundary portion a between the electrodes 2a, 2b and the substrate 1, ultraviolet rays in the sun rays and corrosive substances in the atmosphere or rainwater (for example, The substrate 1 itself is deteriorated by nitrogen oxide, sulfur oxide, salt, etc.), and since the adhesion at the boundary a is poor, corrosion starts at the boundary a, the copper plate is exposed, and green rust occurs. And the electrodes 2a,
The adhesion between 2b and the substrate 1 is further deteriorated, and the electrode 2a,
There is a problem that peeling of 2b occurs.

The present invention has been made in view of the above problems, and an object thereof is to provide a rain sensor which is excellent in weather resistance and corrosion resistance and can withstand long-term use.

[0005]

In order to achieve this object, the present invention provides an inter-electrode resistance detection type rain sensor for buildings, in which plated comb-teeth-shaped electrodes are arranged on a substrate. The boundary between the electrode and the substrate is covered with a resist film.

[0006]

In the rain sensor of the present invention, since the boundary between the electrode and the substrate is covered with the resist film as described above,
Intrusion of corrosive substances contained in rainwater or air into the boundary part and direct irradiation of the sun's rays to the electrode or substrate are prevented.

[0007]

1 is a sectional view taken along the line AA of FIG. 2 showing an embodiment of a rain sensor according to the present invention, and FIG. 2 is a partial plan view of the embodiment. In FIGS. 1 and 2, reference numeral 1 denotes a resin substrate, for example, epoxy-based, polyamide-based, BS-based,
AES-based, AS-based, PP-based and other weather resistant resins are used. The copper plate 4 forming the pair of comb-shaped electrodes 2a and 2b is fixed on the substrate 1 by, for example, a printing method or adhesion, and a nickel plating layer 5 and a gold plating layer 6 are formed thereon. Then, a resist film 7 is formed thereon from above by a printing method so as to cover the boundary portion a between the electrodes 2a and 2b and the substrate 1. In the examples, as the material for the resist film 7, a thermosetting odorless solder resist ink S-40 manufactured by Taiyo Ink Mfg. Co., Ltd. was used.
(Epoxy resin as the main component, other filler, curing agent,
(Including color pigments, solvents and additives) were used.

The rain sensor according to the present invention and conventional products were tested for weather resistance and corrosion resistance. In this test, the one according to the present invention uses a copper plate 4 formed on the substrate 1 by a printing method, both of which use an epoxy resin, and the same material except for the other resist film 7. , And tested as dimensions. The outline of the test contents and the results are described below.

[Weather resistance test] The resistance value was changed by sunshine. Sunshine hours 500
The resistance value was measured before sunshine (new) and after sunshine, during drying, during immersion in water, and immediately after pulling from water. As a result, the resistance value before and after drying of the product according to the present invention was infinite, and the resistance value after immersion in water was almost the same. However, a large difference occurred in the change in resistance immediately after pulling. That is, in the case of the conventional product, as compared with the resistance value immediately after pulling up before sunshine, the resistance value immediately after pulling up after sunshine was reduced to about 1/10 to 1/20, and the decrease in resistance value was remarkable. However, according to the present invention, compared to the resistance value immediately after pulling before sunshine, the resistance value immediately after pulling after sunshine is about
Compared with the conventional product, the degree of resistance decrease was small and the weather resistance was improved.

Further, according to the present invention,
The resist film 7 was discolored and the gloss was changed, and the gold plating layer 6 was slightly discolored, but the discoloration of the substrate 1 near the boundary was small. On the other hand, in the case of the conventional product, the substrate 1 was significantly discolored, and the gold plating layer 6 was also slightly discolored.

[Corrosion Resistance Test] Water containing sodium chloride, cupric chloride and acetic acid was used for 48 hours, 96 hours and
After spraying for 44 hours and 192 hours, the resistance value was measured at the time of drying, at the time of immersion in water, and immediately after pulling up from water. The results were as follows.

(48-hour test) Regarding the resistance value at the time of drying, the resistance value of the present invention was infinite and did not change regardless of whether it was new or after being sprayed for 48 hours. On the other hand, in the case of the conventional product, the resistance value decreased after spraying for 48 hours with respect to the new product.

Further, in the case of measurement in water, in the case of the conventional product, the resistance value after spraying for 48 hours is reduced to about 27% to 30% with respect to the resistance value of the new product, while in the case of the conventional product. The resistance value after spraying for 48 hours fell to about 27% to 30% of the resistance value of the new product.

Further, in the case of measurement immediately after pulling up from water, the resistance value after spraying for 48 hours was reduced to about 7% to 12% with respect to the resistance value of a new product in the case of the present invention,
In the case of the conventional product, the ratio of the resistance value after spraying for 48 hours to the resistance value of the new product decreased to about 10% to 17%. As described above, the rate of decrease in the resistance value was not so different between the conventional product and the product of the present invention, but the absolute value of the resistance value of the product of the present invention was higher than that of the conventional product, which was about twice.

In terms of appearance, generation of patina in the conventional product was remarkable, while generation of patina in the product of the present invention was slight.

(Change in resistance value with the lapse of spraying time) In the case of the conventional product, the resistance value after spraying for 96 hours sharply drops to about 2.5% to 8% of the resistance value of the new product when immersed. Also, the resistance value immediately after pulling is about 0.
It fell to 7% to 1.3%, and could not withstand the intended use. Then, as the spraying time became longer, the resistance value rather increased due to the progress of electrode corrosion and dissolution. On the other hand, in the product of the present invention, each resistance value after spraying for 192 hours was maintained at about half the resistance value after spraying for 48 hours. As can be seen from this result, the one according to the present invention is
Corrosion resistance is significantly improved compared to conventional products.

The above description has been made for the case where the electrode 4 is copper and the plating layers 5 and 6 are nickel and gold. However, aluminum or brass or the like is used as the electrode, and platinum or other material is used for plating. A metal may be used. Further, in the embodiment, the entire surface of the substrate other than the electrode formation surface is covered with the resist film, but only the boundary between the substrate 1 and the electrodes 2a and 2b may be covered. In addition, various modifications and additions can be made to each component without departing from the scope of the present invention.

[0018]

According to the present invention, since the boundary between the electrode and the substrate is covered with the resist film, the corrosion of the electrode at the boundary can be prevented. Further, the exposure of the substrate at the boundary is eliminated, and the deterioration is first the deterioration of the resist film, and then the substrate is deteriorated, so that the weather resistance is improved. Also,
Deterioration of the substrate at the boundary can be prevented, and peeling of the electrode can be prevented.

[Brief description of drawings]

FIG. 1 is a second view showing an embodiment of a rain sensor according to the present invention.
It is an AA sectional view of a figure.

FIG. 2 is a plan view of the rain sensor of the embodiment.

FIG. 3 is a perspective view showing an example of a rain sensor to which the present invention is applied.

FIG. 4 is a cross-sectional view showing a conventional rain sensor.

[Explanation of symbols]

 1 substrate 2a, 2b electrode 3 units 4 copper plate 5 nickel plating layer 6 gold plating layer 7 resist film

Claims (1)

[Claims] 1. An inter-electrode resistance detection type rain sensor for a building, in which plated comb-shaped electrodes are arranged on a substrate, wherein a boundary portion between the electrodes and the substrate is covered with a resist film. A characteristic rain sensor for buildings.