CN2085963U

CN2085963U - Film type dewing sensor

Info

Publication number: CN2085963U
Application number: CN 91201543
Authority: CN
Inventors: 梁锡沛; 苏东华
Original assignee: AIR-CONDITIONER INST CHINESE ACADEMY OF ARCHITECTURAL SCIENCES
Current assignee: AIR-CONDITIONER INST CHINESE ACADEMY OF ARCHITECTURAL SCIENCES
Priority date: 1991-01-31
Filing date: 1991-01-31
Publication date: 1991-10-02

Abstract

The utility model discloses a film type condensation sensor whose capacitance can be changed visibly when relative humidity is 95-100% RH, comprising a plastic film, metallic electrodes and a wet sense film of high molecular. The film type condensation sensor can be used by adhering on an object and can be formed into integration with an attachment. The utility model has the advantages of compact structure, reliable performance, etc. The utility model is suited to be used on an integrated circuit device, a video recording head and the objects with special structures.

Description

Film type dewing sensor

The utility model belongs to the electronic sensitive device field.

The condensation sensor of patent of invention CN88102294 is a pair of pectination metal electrode of plating on the ceramic substrate surface, and then is coated with last layer alcohols polymkeric substance or acetal-based resin containing on the part substrate of electrode, and welding electrode lead-in wire and constituting.The condensation sensor of this structure type is compact for structurally requiring, and when constituting one with some specialist devices or object, then is difficult to satisfy practical requirement.

The purpose of this utility model is on the basis of patent of invention CN88102294, provide a kind of and have and this patent of invention same performance, but its structure can be with the incorporate condensation sensor of attachment (or device).It can use on integrated circuit (IC)-components, video tape recorder magnetic head or some other special construction object.

Film-type condensation sensor of the present utility model, form by basement membrane, electrode, humidity-sensitive film, it is characterized in that: is basement membrane with thickness less than 0.1 millimeter plastic sheeting, on basement membrane, be coated with a pair of pectination metal electrode, the extension line two ends of electrode are adopted and are pegged graft or crimping, coat one deck macromolecule humidity-sensitive film on electrode again.Basement membrane is shaped as curved surface, plane or edged surface.

Film-type condensation sensor of the present utility model is because the nonconducting hydrophobic material plastics of employing are basement membrane, its softening point temperature is more than 60 ℃, it can directly be attached on plane, curved surface, edged surface or the metal surface uses, with the attachment collection be one, this attachment can be the special object of integrated circuit (IC)-components, video recording head or structure; The material of metal electrode is tin, aluminium or gold, and the resistance per square of electrode (being every square centimeter resistance value) is not more than 1 kilohm; Macromolecule humidity-sensitive film material is pure base polymer or acetal-based resin.

The principle of work of film-type condensation sensor of the present utility model is when utilizing the environment dewfall, surperficial hygroscopic capacity at condensation sensor increases suddenly, greatly change the dielectric coefficient of humidity-sensitive film, made two interelectrode electric capacitys that paroxysmal variation take place, thereby realized the purpose that dewfall detects.

The performance characteristic of film-type condensation sensor of the present utility model is that when relative humidity was not more than 85%RH, the capacitance of sensor was very little, and kept constant substantially; When relative humidity rose to 95%RH by 85%RH, the capacitance of sensor is corresponding also slightly to raise; But when relative humidity was 95～100%RH, the capacitance of sensor then took place rapidly to change greatly, when its variable quantity can be equivalent to 85%RH 100～1000 times.

The utlity model has simple in structure, dependable performance, advantage easy to use.

Below in conjunction with drawings and Examples, the utility model is described further.

As shown in the figure, the film condensation sensor is made up of basement membrane, electrode, humidity-sensitive film, basement membrane 1 adopts thickness less than 0.1 millimeter plastic sheeting, be convex, on basement membrane, be coated with a pair of pectination metal electrode 2, electrode material is tin, aluminium or gold, and the extension line two ends of electrode 4 are adopted and pegged graft or crimping, and corresponding contact can be fixed on the circuit of the device of coupling or object; Coat one deck macromolecule humidity-sensitive film 3 on electrode, its material is pure base polymer or acetal-based resin.

Claims

1, a kind of film-type condensation sensor, form by basement membrane, electrode, humidity-sensitive film, it is characterized in that: basement membrane adopts thickness less than 0.1 millimeter plastic sheeting, on basement membrane, be coated with a pair of pectination metal electrode, the extension line two ends of electrode are adopted and are pegged graft or crimping, coat one deck alcohol base polymer or acetal-based resin macromolecule humidity-sensitive film on electrode.

2, film-type condensation sensor as claimed in claim 1, it is characterized in that: described electrode can adopt tin, aluminium or gold, and the resistance per square of electrode is not more than 1 kilohm.

3, film-type condensation sensor as claimed in claim 1, it is characterized in that: described basement membrane is shaped as curved surface, plane or edged surface.