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    • 5. 发明申请
    • APPARATUS AND METHOD FOR DETERMINING SURFACE IONIC CONTAMINATION LEVELS OF ELECTRONIC ASSEMBLIES SUCH AS PRINTED CIRCUIT ASSEMBLIES
    • 用于确定电子组件的表面离子污染水平的装置和方法如印刷电路组件
    • WO1988004962A1
    • 1988-07-14
    • PCT/US1987003490
    • 1987-12-22
    • FRY METALS INC.
    • FRY METALS INC.Brous, Jack
    • B08B03/04
    • H05K3/26G01N27/06H05K2203/0783H05K2203/1518H05K2203/163
    • A method and apparatus for determining the surface ionic contamination level on an electronic assembly utilizes deionized, heated solvent mixtures consisting essentially of water and a water miscible solvent which, when heated well above room temperature, has a vapor pressure substantially less than that of water at the same temperature. A solvent mixture is pumped from a solvent reservoir (12) by the centrifugal pump (26), heated in a heater (30) and sprayed through conduits (18), (29), (24) and (20) on said electronic assembly (14). The water miscible solvent acts quickly on the electronic assembly (14) to dissolve and to remove the non-ionic residues, thereby exposing the ionic contaminants such that they may be dissolved and removed from said assembly (14). The aqueous solution (12) flows from the enclosure (10) to a dynamic contamination measurement apparatus (34) for the determination of the ionic contamination level in the assembly (14), then returns to the solvent reservoir (12). A change in an electrical property of the mixture, such as conductivity or resistivity, due to the presence of the dissolved ionic contaminants is measured to obtain an indication of the ionic contamination level originally present in said electronic assembly (14).
    • 用于确定电子组件上的表面离子污染物水平的方法和装置使用基本上由水和水混溶性溶剂组成的去离子,加热的溶剂混合物,当加热到高于室温时,其蒸气压显着小于水的蒸气压 相同的温度。 溶剂混合物通过离心泵(26)从溶剂储存器(12)泵送,在加热器(30)中加热并通过所述电子组件上的导管(18),(29),(24)和(20)喷射 (14)。 水混溶性溶剂快速地作用于电子组件(14)以溶解和去除非离子残余物,从而暴露离子污染物,使得它们可以从所述组件(14)中溶解并除去。 水溶液(12)从外壳(10)流动到动态污染测量设备(34),用于确定组件(14)中的离子污染物水平,然后返回到溶剂容器(12)。 测量由于溶解的离子污染物的存在而导致的混合物电性能的变化,例如导电性或电阻率,以获得最初存在于所述电子组件(14)中的离子污染水平的指示。