| 摘要 |
PURPOSE: To prevent leakage between an ion-selective film and an insulating films so as to effectively fix the ion-selective film and insulate a conductor by constituting part of at least one insulating layer of a plurality of insulating layers arranged on a substrate made mutually soluble with the ion-selective film. CONSTITUTION: An FET20 surrounded by a screen-printed insulating underring 25 is inserted into a recessed section 15 on the surface of an electrically insulating substrate 10. A conductive film 30 contains an offset gate 35 and the FET 20 is covered with an electrically insulating under coating 40 except its electrical contacting section. An electrically insulating film anchor layer 50 comes into contact with the gate 35 from an opening 20a while maintaining the opening 20a and an electrically insulating protective coating 60 covers the entire surface of the substrate 10 excluding the opening 20a. Since an ion-selective film 90 fills up the opening 20a and is surrounded by a film well 100 formed by mutual fusion during the formation of the film 90, the penetration of water between the film 90 and insulating layers can be prevented and the film 90 can be fixed effectively to the insulating layers. |
