JPS61173145A - Detecting element - Google Patents

Abstract

PURPOSE:To improve the productivity of a detecting element for moisture or temp. by providing spirally a pair of electrodes to the curved wall on the periphery side of an insulator and depositing a conductive material of which the electric resistance value changes with an atmospheric gas to the space between both electrodes. CONSTITUTION:A pair of the electrodes 2, 3 consisting of gold, silver, etc. are spirally formed to the curved wall 4 on the peripheral side of a circular cylindrical body 1 consisting of ceramics, etc. and the conductive material 7 of which the resistance value changes with the atmospheric gas is deposited to the space 8 between the electrodes, by which the detecting element is formed. The humidity detecting element is obtd. by using a metallic oxide or org. high- polymer electrolyte for the material 7 and the temp. detecting element is obtd. by using a metallic oxide or org. high-polymer charge transfer complex for said material. The productivity is therefore improved by forming continuously the plural electrodes onto the long-sized cylindrical body by a spraying method, etc. and cutting such body. The compactification of the detecting element is made possible as well.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a sensing element that can be used as a humidity sensing element or a temperature sensing element.

(b) Conventional technology As a humidity sensing element, for example, as disclosed in Japanese Patent Application Laid-Open No. 55-10502, a pair of comb-shaped electrodes are provided facing each other on an insulating substrate, and the electrical resistance changes depending on the humidity of the atmospheric gas. It is known that an organic polymer material having a variable temperature is applied within the gap between both electrodes.

Similarly to the humidity sensing element, the temperature sensing element also has a pair of comb-shaped electrodes facing each other on an insulating substrate, and a metal oxide whose electrical resistance changes depending on the temperature of the atmospheric gas is coated in the gap between the two electrodes. This is common.

e→ Problems to be Solved by the Invention Conventionally, comb-shaped electrodes are printed on each plate-shaped insulating substrate by screen printing, resulting in poor productivity.

In view of these problems, the present invention provides a temperature/humidity sensing element that can be continuously produced and can be easily converted.

B) Means for Solving the Problems The present invention provides a pair of electrodes spirally provided on the circumferential curved wall of an insulator having the shape of a column or cylinder, and a spiral gap formed between the two electrodes. The sensing element is covered with a conductive material whose electrical resistance value changes depending on the atmospheric gas.

(E) Operation While rotating a long insulator in the shape of a cylinder or cylinder, paste-like metal such as gold or silver is sprayed from a pair of nozzles to form a pair of electrodes on the circumferential curved wall of the insulator. After forming a spiral, the spiral gap formed between the two electrodes is covered with a conductive material whose electrical resistance value changes depending on the atmospheric gas.
Thereafter, this long piece is cut into short pieces and lead wires are soldered to the ends of the pair of charges, respectively, to complete a temperature/humidity sensing element.

(f) Embodiment FIG. 1 is a perspective view of a sensing element showing an embodiment of the present invention, in which (1) is a cylindrical insulator made of ceramics or glass; A pair of electrodes made of gold, silver, silver palladium, ruthenium oxide, nickel, etc. are spirally provided on the curved wall (4).

(51+61 is a lead wire soldered to both electrodes (21 (31), (7) is a conductive material that covers the spiral gap (8) formed between these two electrodes (21 (3)) This conductive material (7) has the property that its electrical resistance value changes depending on the atmospheric gas, so metal oxides and organic polymer electrolytes are used when manufacturing it as a humidity sensing element, while metal oxides and organic polymer electrolytes are used when manufacturing it as a temperature sensing element. Metal oxides and organic polymer charge transfer complexes are used.

FIG. 2 is a perspective view of an apparatus for manufacturing this sensing element.
First, the long cylindrical insulator (1) is rotatably held between the rotating shaft αω of the electric motor (9) and the bearing pivot αυ, and the insulator (1) is moved by the electric motor (9) as shown by the solid arrow. direction. At the same time, when the spray tool α which spouts paste-like metals such as gold and silver from a pair of nozzles /l/α2α3 is moved from the left end of this manufacturing equipment to the right end as shown by the broken line arrow, the insulator (1) On the circumferential curved wall (4) K, spiral parallel electrodes (2) and (3) are formed with constant intervals.

If gold is used for this pair of electrodes (2) and (3), the electrodes (
Print a metal object such as silver on the 2++31 part and make this 50
Lead wires (5) (6) are formed by firing at 0 to 700℃.
1 so that it can be soldered to α61 (17) (.

Next, this insulator (1) is connected to the electric motor (9) and the bearing pivot
υ and cut along the cutting line (151), and connect the lead wires (5) (61) to the ends of the pair of electrodes (2) (31), respectively.
After soldering, the above-mentioned conductive material (7) is applied to the gap (81) formed between both electrodes (2) (31) by spraying, etc., and the humidity sensing element and temperature sensing element shown in Fig. 1 are formed. is completed.

In the above embodiment, the spraying operation for forming the electrode (21(3)) and the spraying operation for the conductive substance (7) were performed in separate steps, but The nozzle that spouts substance (7) is the above-mentioned nozzle H (1
7) If provided in between, it is possible to perform both spraying operations at the same time.

Further, an electrode (21 (3) is attached to the circumferential curved wall (4) of the insulator (1).
) is formed and cut, and the lead wires (5) and (6) connected to the electrodes (2) and (3) are immersed in a solution of the conductive substance (7) to form the circumferential curved wall (4). The entire area is covered with a conductive material (7
).

Further, the insulator (1) may have a cylindrical shape or a truncated cone shape other than the cylindrical shape.

(G) Effects of the Invention According to the present invention, the insulator is shaped like a column or cylinder, and a pair of electrodes are spirally provided on the circumferential curved wall. electrodes for several sensing elements can be formed continuously, and productivity can be improved.

Moreover, since a pair of electrodes and a moisture-sensitive and temperature-sensitive member made of 85 conductive material are provided on the entire circumferential side of the sensing element, the humidity and temperature-sensitive members are made of a plate-like insulator. It can be made more compact than the conventional sensing element provided on one side of the substrate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a sensing element showing an embodiment of the present invention, and FIG.
The figure is a perspective view of an apparatus for manufacturing this sensing element. (1)... Insulator, (2) (31... Electrode, (
4)... Circumferential curved wall, (7)... Conductive material, (
8)...Gap.

Claims (1)

[Claims] (1) A pair of electrodes are spirally provided on the circumferential curved wall of the insulator, and the spiral gap formed between the two electrodes is covered with a conductive material whose electrical resistance value changes depending on the atmospheric gas. Detection element.