Patent ID: 7453061

Claim:
A quadrupole mass analyzer comprising four quartz tubes separated by predetermined distance to form a shape of rotation symmetry and being parallel to each other; an electric part formed with a predetermined area by a platinum coating being divided into a prefilter electrode part and a main filter electrode part in a longitudinal direction of the quartz tube in a circumferential surface in an axial direction of the rotation symmetry of the quartz tube, a cross-section of the platinum group metal coating on an opposing quartz tube forming a substantial hyperbolic surface; a quartz pin being chamfered at both ends in a shape with a same radius curvature as the quartz tube and being closely fixed between the adjacent quartz tubes; and an electrically conductive connection member electrically connecting each of prefilter electrode parts and main filter parts of the opposing quartz tubes so as to apply RF and DC electric source.