Title: Humidity-sensitive sensor

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Claims: What is claimed is:

1. A humidity-sensitive sensor comprising:

an electrically non-conductive base plate;

a pair of spaced electrodes fixed on said base plate;

a humidity-sensitive coating composed of a hygroscopic resin having dispersed therein electrically conductive particles and extending over said pair of electrodes; and

an adhesive layer bonding said humidity-sensitive coating to said base plate, said adhesive layer being composed of an adhesive having dispersed therein electrically conductive particles and electrically connecting each of said electrodes to said humidity-sensitive coating while electrically insulating said electrodes from each other.

2. The sensor of claim 1 wherein said adhesive is non-hygroscopic.

3. The sensor of claim 2 wherein the volume of the electrically conductive particles dispersed in the hygroscopic resin is 20 to 60% of that of the hygroscopic resin.

4. The sensor of claim 3 wherein said hygroscopic resin is a resin taken from the group consisting of acrylate resins and methacrylate resins.

5. The sensor of claim 4 wherein said resin is a polymer of a hydroxy lower alkyl acrylate.

6. The sensor of claim 4 wherein said resin is a hydroxy lower alkyl methacrylate.

7. The sensor of claim 4 wherein said resin is a homopolymer of 2-hydroxyethyl methacrylate.

8. The sensor of claim 4 wherein said resin is a copolymer of 2-hydroxyethyl methacrylate.

9. The sensor of claim 3 wherein said hygroscopic resin is cross-linked with a cross-linking agent.

10. The sensor of claim 3 wherein at least one of said pair of electrodes has a lead of a metal selected from the group consisting of gold, platinum, palladium, rhodium and alloys thereof.

11. The sensor of claim 3 wherein said base plate is a window glass of an automobile, and the humidity-sensitive sensor is on the inside surface of said window glass.

Other info:

Inventors: Ohsato, Nobuyoshi (Itami, JA)
Sono, Kenzo (Nishinomiya, JA)
Tanaka, Keihachiro (Itami, JA)

Application Number: 496856
Filing Date: 1974-08-12
Publication_date: 1976-09-28
Assignee: Nippon Sheet Glass Co., Ltd. (Osaka, JA)
Primary Class(es): 338/35 73/335.05, 200/61.04, 219/203, 219/522, 428/328, 428/329
Other Classes:
US Patent Ref:

2937524	May, 1960	Gregor	338/35.
3671913	Jun, 1972	Mamiya et al.	338/35.
3686606	Aug, 1972	Thoma	338/35.
3848218	Nov, 1974	Wakabayashi	338/35.
3868492	Feb, 1975	Taylor	338/35.

Other Refs:
Primary Examiner: Albritton, C. L.
Assistant Examiner:
Attorney: Wenderoth, Lind & Ponack