JPS6236173B2 - - Google Patents
Info
- Publication number
- JPS6236173B2 JPS6236173B2 JP3744882A JP3744882A JPS6236173B2 JP S6236173 B2 JPS6236173 B2 JP S6236173B2 JP 3744882 A JP3744882 A JP 3744882A JP 3744882 A JP3744882 A JP 3744882A JP S6236173 B2 JPS6236173 B2 JP S6236173B2
- Authority
- JP
- Japan
- Prior art keywords
- dew condensation
- resistance
- substrate
- detection
- resistance value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005494 condensation Effects 0.000 claims description 67
- 238000009833 condensation Methods 0.000 claims description 67
- 238000001514 detection method Methods 0.000 description 41
- 239000000758 substrate Substances 0.000 description 25
- 239000000843 powder Substances 0.000 description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 229910006404 SnO 2 Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/121—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid for determining moisture content, e.g. humidity, of the fluid
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【発明の詳細な説明】
この発明は結露時における抵抗値のバラツキの
小さい結露センサーに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dew condensation sensor with small variations in resistance value during condensation.
結露センサーには相対湿度―抵抗特性が正に変
化するタイプのものがある。これには、たとえば
吸湿性樹脂中に炭素などの導電粉末を分散したも
のがあり、低湿度状態では導電粉末同志の電気的
接触が保たれているため低抵抗状態を示し、結露
状態になると樹脂の膨潤に伴なつて導電粉末同志
の電気的接触が断たれ、高抵抗状態を示すという
ものである。 Some dew condensation sensors have a positive relative humidity-resistance characteristic. For example, there is a material in which conductive powder such as carbon is dispersed in a hygroscopic resin. Under low humidity conditions, electrical contact between the conductive powders is maintained, resulting in a low resistance state, and when condensation occurs, the resin As the conductive powder swells, electrical contact between the conductive powders is broken, resulting in a high resistance state.
したがつて、ある抵抗値に検出レベルをきめて
おけば、検出レベルをこえて抵抗値の増大が起き
たとき、高湿度状態や結露状態が検出できること
になる。ところが、高湿度や結露状態での結露セ
ンサーの抵抗値は素子ごとにバラツキをもつてお
り、検出レベルのバラツキが小さくできれば回路
設計上有利であり、検出レベルのバラツキの小さ
い結露センサーが求められていた。また、高湿度
中で直流を印加すると、時間経過とともに水の電
解による導電粉末の酸化が生じ、素子抵抗値が大
きくなるという問題も生じている。 Therefore, if a detection level is set at a certain resistance value, a high humidity state or a dew condensation state can be detected when the resistance value increases beyond the detection level. However, the resistance value of a condensation sensor under conditions of high humidity or condensation varies from element to element, and it would be advantageous for circuit design if the variation in detection level could be reduced, so there is a need for a condensation sensor with small variation in detection level. Ta. Furthermore, when direct current is applied in high humidity, the conductive powder is oxidized over time due to electrolysis of water, resulting in an increase in element resistance.
したがつて、この発明はかかる背景にもとづい
てなされたものであり、結露時における抵抗値の
バラツキが小さく、特性が改善された結露センサ
ーを提供せんとするものである。 Therefore, the present invention has been made based on this background, and it is an object of the present invention to provide a dew condensation sensor with improved characteristics and less variation in resistance value during dew condensation.
以下、この発明を図示した実施例に従つて詳細
に説明する。 EMBODIMENT OF THE INVENTION Hereinafter, this invention will be described in detail according to illustrated embodiments.
第１図はこの発明にかかる結露センサーの一例
を示したものである。 FIG. 1 shows an example of a dew condensation sensor according to the present invention.
図において、１は基板であり、この基板１上に
はくし歯状の検出電極２，３が形成されている。
さらに基板１上にはこの検出電極２，３を含め
て、正の相対湿度―抵抗特性を有する結露検出膜
４が形成されている。この構成にかかる結露セン
サーの特徴は基板１が抵抗体よりなることであ
る。基板１を構成する抵抗体としては、たとえば
SnO2系、TiO2-X系（０＜ｘ＜２）などがある。
この基板１の抵抗値は結露検出膜４の常湿状態に
おける抵抗値よりも大きい値を有し、結露検出膜
４の結露状態における抵抗値付近の抵抗値を有す
るものである。このときの抵抗値は結露状態を検
出する検出電極２，３により測定される値にもと
づいて決定される。なお、５，６はリード線を示
す。 In the figure, reference numeral 1 denotes a substrate, and comb-shaped detection electrodes 2 and 3 are formed on this substrate 1.
Furthermore, a dew condensation detection film 4 having positive relative humidity-resistance characteristics is formed on the substrate 1, including the detection electrodes 2 and 3. A feature of the dew condensation sensor having this configuration is that the substrate 1 is made of a resistor. For example, the resistor forming the substrate 1 is
Examples include SnO 2 series and TiO 2-X series ( 0 < x < 2 ).
The resistance value of this substrate 1 is larger than the resistance value of the dew condensation detection film 4 in a normal humidity state, and has a resistance value close to the resistance value of the dew condensation detection film 4 in a dew condensation state. The resistance value at this time is determined based on the value measured by the detection electrodes 2 and 3 that detect the dew condensation state. Note that 5 and 6 indicate lead wires.
かかる構成によれば、結露検出膜４と基板１に
もとづく抵抗が並列接続された状態にあり、常湿
状態では結露検出膜４が低抵抗状態であるから、
結露検出膜４にもとづく抵抗が検出電極２，３か
ら検出される。一方、結露状態になると結露検出
膜４が高抵抗状態になるから、低抵抗状態と同様
に、結露検出膜４にもとづく抵抗が検出電極２，
３から検出される。しかし結露状態における結露
検出膜４の抵抗値にバラツキが生じ、所定レベル
より高い状態になると、基板１の抵抗値が結露検
出膜４より相対的に低い値となり、基板１で設定
された抵抗値のレベルになり、基板１にもとづく
抵抗値が検出されることになる。したがつて基板
１の値はあらかじめ検出レベルの抵抗値に合わせ
ておけばよいことになる。 According to this configuration, the dew condensation detection film 4 and the resistor based on the substrate 1 are connected in parallel, and the dew condensation detection film 4 is in a low resistance state under normal humidity.
Resistance based on the dew condensation detection film 4 is detected from the detection electrodes 2 and 3. On the other hand, in a condensation state, the dew condensation detection film 4 becomes a high resistance state, so that the resistance based on the dew condensation detection film 4 is the detection electrode 2, as in the low resistance state.
Detected from 3. However, when the resistance value of the dew condensation detection film 4 in a dew condensation state varies and becomes higher than a predetermined level, the resistance value of the substrate 1 becomes a value relatively lower than that of the dew condensation detection film 4, and the resistance value set in the substrate 1 The resistance value based on the substrate 1 is detected. Therefore, the value of the substrate 1 may be adjusted in advance to the resistance value of the detection level.
第２図はこの発明にかかる結露センサーの相対
湿度―抵抗特性の一例を示したものである。図に
おいて、実線Ａは結露センサーの所定の相対湿度
―抵抗特性であり、一点鎖線Ｂは結露センサーの
バラツキ範囲における相対湿度―抵抗特性を示
す。破線Ｃはたとえば第１図に示した構成によれ
ば基板１の抵抗値レベルを示す。 FIG. 2 shows an example of the relative humidity-resistance characteristics of the dew condensation sensor according to the present invention. In the figure, a solid line A represents a predetermined relative humidity-resistance characteristic of the dew condensation sensor, and a dashed line B represents a relative humidity-resistance characteristic in a variation range of the dew condensation sensor. A broken line C indicates the resistance level of the substrate 1 according to the configuration shown in FIG. 1, for example.
したがつて、上述した説明からも明らかなよう
に、結露センサーの相対湿度―抵抗特性にバラツ
キが生じたとしても基板１によつて常に結露状態
における抵抗値レベルが設定されているから、結
露センサーの特性バラツキを小さくすることがで
きる。また出力レベルも一定とすることができ、
検出回路の設計も容易なものとなる。さらには結
露時において、結露検出膜４が基板１よりも抵抗
値が大きくなつたとき、基板１に電流が流れるた
め、結露検出膜４に流れる電流が小さくなり、結
露センサーの寿命を延ばすことができるととも
に、劣化を小さくすることができるなどの効果を
有する。 Therefore, as is clear from the above explanation, even if there are variations in the relative humidity-resistance characteristics of the dew condensation sensor, the resistance level in the dew condensation state is always set by the substrate 1, so the dew condensation sensor Characteristic variations can be reduced. Also, the output level can be kept constant,
The design of the detection circuit also becomes easier. Furthermore, during dew condensation, when the resistance value of the dew condensation detection film 4 becomes larger than that of the substrate 1, a current flows through the substrate 1, so the current flowing through the dew condensation detection film 4 becomes smaller, thereby extending the life of the dew condensation sensor. It also has the effect of reducing deterioration.
第３図はこの発明にかかる結露センサーの他の
例を示したものである。 FIG. 3 shows another example of the dew condensation sensor according to the present invention.
この結露センサーの特徴は基板１に絶縁性のも
のを用い、検出電極２，３に接続されているリー
ド線５，６間に固定抵抗７を接続したものであ
る。 This dew condensation sensor is characterized in that an insulating substrate 1 is used, and a fixed resistor 7 is connected between lead wires 5 and 6 connected to detection electrodes 2 and 3.
抵抗７は、第１図に示した抵抗体よりなる基板
１と同様、結露検出膜４の常湿状態における検出
電極２，３（この構成例ではリード線５，６）間
の抵抗より大きい値を有し、結露検出膜４とは並
列に電気接続されている。 Like the substrate 1 made of a resistor shown in FIG. 1, the resistor 7 has a value greater than the resistance between the detection electrodes 2 and 3 (in this configuration example, the lead wires 5 and 6) in the normal humidity state of the dew condensation detection film 4. and is electrically connected in parallel with the dew condensation detection film 4.
第４図、第５図はこの発明にかかる結露センサ
ーのさらに他の例を示したものであり、第４図は
その平面図、第５図は第４図のＡ―A′線断面図
である。 4 and 5 show still another example of the dew condensation sensor according to the present invention, FIG. 4 is a plan view thereof, and FIG. 5 is a sectional view taken along line A-A' in FIG. be.
この結露センサーの特徴は絶縁性基板１上の対
向電極２，３間に抵抗膜８を形成し、さらに対向
電極２，３および抵抗膜８を含めて結露検出膜４
を形成したことにある。 The feature of this dew condensation sensor is that a resistive film 8 is formed between the opposing electrodes 2 and 3 on the insulating substrate 1, and a dew condensation detection film 4 including the opposing electrodes 2 and 3 and the resistive film 8 is formed.
The reason lies in the fact that it was formed.
この構成例によれば、結露検出膜４にもとづく
抵抗体と抵抗膜８とが並列に電気接続された状態
にある。 According to this configuration example, the resistor based on the dew condensation detection film 4 and the resistive film 8 are electrically connected in parallel.
第６図はこの発明にかかる結露センサーのさら
に他の例を示したものである。 FIG. 6 shows still another example of the dew condensation sensor according to the present invention.
この結露センサーの特徴は絶縁性基板１の上に
くし歯状の検出電極２，３を形成するとともに、
この検出電極２，３を含めて結露検出膜４を形成
する一方、結露検出膜４を形成していない絶縁性
基板１上に検出電極２，３間を繋ぐ抵抗膜９を形
成したことにある。 The feature of this dew condensation sensor is that comb-shaped detection electrodes 2 and 3 are formed on an insulating substrate 1, and
The dew condensation detection film 4 is formed including the detection electrodes 2 and 3, while the resistance film 9 connecting the detection electrodes 2 and 3 is formed on the insulating substrate 1 on which the dew condensation detection film 4 is not formed. .
この構成例によれば、第４図、第５図に示した
例と同様、結露検出膜４にもとづく抵抗体と抵抗
膜９とが並列に電気接続された状態にある。 According to this configuration example, similar to the examples shown in FIGS. 4 and 5, the resistor based on the dew condensation detection film 4 and the resistive film 9 are electrically connected in parallel.
以上、第３図〜第６図に示した構成例も、第１
図に示したものと同様の効果が得られるものであ
る。 As mentioned above, the configuration examples shown in FIGS. 3 to 6 also apply to the first
The same effect as shown in the figure can be obtained.
次にこの発明にかかる結露センサーを具体的実
施例にもとづいて説明する。 Next, the dew condensation sensor according to the present invention will be explained based on specific examples.
実施例 １
ポリビニルアルコールをアルコールとエチレン
グリコールモノブチルエーテルに溶解してポリビ
ニルアルコール溶液を準備した。このポリビニル
アルコール溶液100重量部に対して平均粒径30ｍ
μのカーボンブラツク粉末を等量加え、よく混練
してペーストを作成した。Example 1 A polyvinyl alcohol solution was prepared by dissolving polyvinyl alcohol in alcohol and ethylene glycol monobutyl ether. Average particle size is 30m per 100 parts by weight of this polyvinyl alcohol solution.
An equal amount of μ carbon black powder was added and thoroughly kneaded to prepare a paste.
一方、SnO2―Sb2O3系のセラミツク抵抗体基板
上に電極間隔0.3mm，全電極対向長6.5cmのくし歯
状のカーボン電極を形成した。このときの電極間
抵抗は600KΩであつた。 On the other hand, comb-shaped carbon electrodes with an electrode spacing of 0.3 mm and a total electrode length of 6.5 cm were formed on a SnO 2 --Sb 2 O 3 based ceramic resistor substrate. The interelectrode resistance at this time was 600KΩ.
さらにこの電極上に前記ペーストを塗布した。
つづいて150℃の温度で熱処理し結露検出膜を形
成し、結露センサーを作成した。 Further, the paste was applied onto this electrode.
Next, a dew condensation detection film was formed by heat treatment at a temperature of 150°C, and a dew condensation sensor was created.
得られた結露センサーの常湿（相対湿度60％）
での抵抗は2.5KΩであり、結露状態では550KΩ
であつた。また、40℃、90〜95％の相対湿度中で
500時間直流を印加したのち、相対湿度60％、お
よび結露時の抵抗を測定したところそれぞれ
2.6KΩ、560KΩであり、抵抗変化は小さいもの
であつた。この結露センサーは第１図に示した構
成に対応するものである。 Normal humidity of the resulting condensation sensor (relative humidity 60%)
Resistance is 2.5KΩ under conditions and 550KΩ under condensation condition
It was hot. Also, at 40℃ and 90-95% relative humidity.
After applying direct current for 500 hours, we measured the resistance at relative humidity of 60% and during condensation.
They were 2.6KΩ and 560KΩ, and the resistance change was small. This dew condensation sensor corresponds to the configuration shown in FIG.
結露検出膜のみの抵抗値を測定したところ7M
Ωであつた。したがつて、基板を抵抗体とし、こ
の基板を結露検出膜に対して電気的に並列接続し
たため、基板にもとづく抵抗値にレベルが設定さ
れ、結露検出膜の抵抗値にバラツキがあつたとし
ても、バラツキの小さい結露センサーを得ること
ができる。 When I measured the resistance value of only the dew condensation detection film, it was 7M.
It was Ω. Therefore, since the substrate is used as a resistor and this substrate is electrically connected in parallel to the condensation detection membrane, the level is set to the resistance value based on the substrate, and even if there is variation in the resistance value of the condensation detection membrane. , it is possible to obtain a dew condensation sensor with small variations.
第１図はこの発明にかかる結露センサーの例を
示す平面図、第２図は相対湿度―抵抗特性図、第
３図〜第６図はこの発明にかかる結露センサーの
他の例を示す図であり、第３図〜第４図、第６図
は平面図、第５図は第４図Ａ―A′線断面図であ
る。
１……基板、２，３……検出電極、４……結露
検出膜、７……固定抵抗、８，９……抵抗膜。
FIG. 1 is a plan view showing an example of the dew condensation sensor according to the present invention, FIG. 2 is a relative humidity-resistance characteristic diagram, and FIGS. 3 to 6 are diagrams showing other examples of the dew condensation sensor according to the present invention. 3 to 4 and 6 are plan views, and FIG. 5 is a sectional view taken along the line AA' in FIG. 4. DESCRIPTION OF SYMBOLS 1...Substrate, 2, 3...Detection electrode, 4...Dew condensation detection film, 7...Fixed resistor, 8, 9...Resistive film.
Claims (1)
る結露センサーにおいて、 抵抗変化を検出する電極間に、常湿状態におけ
る電極間抵抗より大きな値を有し、かつ結露状態
においては電極間抵抗より小さい値を有する抵抗
が並列接続されていることを特徴とする結露セン
サー。[Scope of Claims] 1. In a dew condensation sensor whose relative humidity-resistance characteristics positively change due to dew condensation, the resistance between the electrodes for detecting a change in resistance has a value larger than that in a normal humidity state, and in a dew condensation state, is a dew condensation sensor characterized in that a resistor having a value smaller than the interelectrode resistance is connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3744882A JPS58154651A (en) | 1982-03-09 | 1982-03-09 | Sensor for vapor condensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3744882A JPS58154651A (en) | 1982-03-09 | 1982-03-09 | Sensor for vapor condensation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58154651A JPS58154651A (en) | 1983-09-14 |
| JPS6236173B2 true JPS6236173B2 (en) | 1987-08-05 |
Family
ID=12497776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3744882A Granted JPS58154651A (en) | 1982-03-09 | 1982-03-09 | Sensor for vapor condensation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58154651A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6339667U (en) * | 1986-09-01 | 1988-03-15 | ||
| KR101669678B1 (en) * | 2010-06-24 | 2016-10-26 | 엘지전자 주식회사 | Refrigerator |
-
1982
- 1982-03-09 JP JP3744882A patent/JPS58154651A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58154651A (en) | 1983-09-14 |
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