Capacitance sensor and method of manufacturing the same.

摘要

A small and highly sensitive capacitance type pressure sensor is obtained by filling an alkali halide material (2) such as KBr into a through-hole, forming a conductive thin film (4) on the surface, and dissolving and removing the alkali halide material (2). An insulating plate (1) disposed with a through-hole in the thickness direction is filled with a molten alkali halide material (2) such as KBr. After forming a conductive thin film (4) on the surface of the alkali halide material (2) filled into the through-hole and the vicinity thereof, the alkali halide material (2) is dissolved by water and removed. In this way, a diaphragm is made of the through-hole and the conductive thin film (4). A curve of the diaphragm caused by a pressure difference between the both faces of the conductive thin film (4) is detected as a capacitance change between the conductive thin film (4) and the electrode layer (6).