Patent ID: 6895826
Filing Date: 2005-05-24
Classification: G01F

Abstract:
1. A Coriolis mass flow meter comprising: two parallel flow tubes of a curved tube type having base plates fixedly fitted to them at points serving as vibration fulcrums; a drive unit disposed at the central part of said flow tubes for causing any one of said flow tubes to resonate with the other tube in a phase opposite to each other; a pair of vibration sensors disposed at symmetrical positions with respect to the mounting position of said drive unit for sensing a phase difference proportional to Coriolis force; said drive unit and a pair of said vibration sensors each being formed by a coil and a magnet; said drive unit coil is fitted to any one of said flow tubes and said drive unit magnet is fitted to the other of said flow tubes, and magnets of said vibration sensors are fitted to said any one of said flow tubes and coils of said vibration sensors are fitted to said other flow tube, wherein a support post facing at the end thereof said drive unit provided at the central part of said flow tubes and having wires for electrical connection passed therein is provided; a first flexible printed circuit board extending from the end surface of said support post to the one flow tube is connected to said drive unit coil, and a second flexible printed circuit board extending from the end surface of said support post to the other flow tube is connected to wires extended from coils of said vibration sensors along the surface of said flow tubes in such a manner that said flexible printed circuit boards are bent at the central part of said flow tubes almost symmetrically with respect to the vibration center of each flow tube.