Patent ID: 9316555
Filing Date: 2016-04-19
CPC Classification: G01L,H01J

Claim Text:
1. A cold cathode ionization vacuum gauge, comprising: two electrodes disposed such that one of the electrodes is surrounded by the other electrode having a cylindrical shape to thereby form a discharge space therebetween; and an electrode protection member disposed in the discharge space and configured to protect an inner wall surface of the other electrode in a circumferential direction, wherein the electrode protection member includes a protection portion formed of an elastic member having electric conductivity and a plate-shape, the elastic member being capable of elastic deformation into a cylindrical shape and being capable of changing the diameter of the cylindrical shape in accordance with the elastic deformation, and wherein the protection portion is elastically deformed along a shape of the inner wall surface in the circumferential direction, presses the inner wall surface of the other electrode, and is to be electrically connected to the other electrode.