IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0256007
(1988-10-11)
|
우선권정보 |
JP-0254596 (1987-10-12); JP-0261857 (1987-10-19) |
발명자
/ 주소 |
- Moriya Yoshio (Atsugi JPX) Kojima Ryuji (Tokyo JPX) Nagano Kentaro (Yokohama JPX) Ishikura Kazuhiro (Hiratsuka JPX) Imai Yasuo (Yokohama JPX) Matsushima Yasunobu (Kawasaki JPX)
|
출원인 / 주소 |
- Nihon Parkerizing Co., Ltd. (Tokyo JPX 03)
|
인용정보 |
피인용 횟수 :
19 인용 특허 :
5 |
초록
▼
This invention concerns a humidity sensor wherein a chemical conversion coating, giving attention to the property that it undergoes an impedance decrease with adsorption of moisture, is used as humidity sensing element which is characterizied by an extremely short electrode distance, greatly improve
This invention concerns a humidity sensor wherein a chemical conversion coating, giving attention to the property that it undergoes an impedance decrease with adsorption of moisture, is used as humidity sensing element which is characterizied by an extremely short electrode distance, greatly improved sensitivity, high speed response, stable performance over a long period of time, high reliability and cheaper production cost. The principal point that characterizes the humidity sensor in this invention is that the chemical conversion coating deposited on the metal surface with or without an electrolysis application, is made usable as a humidity sensing element. For the chemical conversion coating, such coatings as phosphate, oxalate, titanium fluoro-complex, chromium phosphate and non-chromium types are used. On top of this chemical conversion coating, application of a humidity sensing film is effected to further improve humidity sensing performance.
대표청구항
▼
A humidity sensor comprising at least one metal electrode in effective contact with, as its sensitive element, a chemical conversion coating film selected from the group consisting of: a phosphate coating comprising at least one of Zn3(PO4)2.4 H2O (Hopeite), Zn2Fe(PO4)2.4H2O (Phosphophyllite), Zn2Ca
A humidity sensor comprising at least one metal electrode in effective contact with, as its sensitive element, a chemical conversion coating film selected from the group consisting of: a phosphate coating comprising at least one of Zn3(PO4)2.4 H2O (Hopeite), Zn2Fe(PO4)2.4H2O (Phosphophyllite), Zn2Ca (PO4)2.2H2O (Scholzite), Zn3(PO4)2.2H2O, AlPO4, AlPO4.H2O, Fe3(PO4)2.8H2O (Vivianite), (Mn,Fe)5H2(PO4)3.4H2O (Hureanlite), Mn5H2(PO4)3.4H2O (Mn-Hureanlite), Fe5H2(PO4).4H2O (Fe-Hureanlite), FePO4.2H2O(Strengite), CaHPO4.2H2O(Brushite), and CaPO4 (Monetite); an oxalate coating comprising at least one of hydrated FeC2O4, hydrated NiC2O4, anhydrous FeC2O4, and anhydrous NiC2O4; a titanium fluoro complex salt coating comprising at least one of Na3TiF6, K3TiF6, (NH4)3TiF6, Na2TiF6, K2TiF6, and (NH4)3TiF6; a chromium phosphate coating; a chromate coating; and a non-chromate coating comprising at least one of a titanium-tannic acid complex and a zirconium-phytic acid complex; wherein said chemical conversion coating film is about 0.5 to 12 microns thick which absorbs water and upon water absorption ionizes to an extent sufficient to change its impedance.
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