Electromagnetic force balance type metering device

Coil attached to the lever portion 55, along a vertical plane parallel to the extending direction of the lever portion 55, lever portions flatly wound to produce the winding portions 61 and 62 of the parallel upper and lower in the extending direction of the Spun consists flat coil 60, the magnetic circuit 70 is opposed to the winding portions 61, 62 of the upper or lower flat coil 60, one or more plate-like magnetized in the direction perpendicular to the vertical plane comprising the permanent magnet 91, a yoke member 75, 76, 77, 78 for guiding the magnetic lines of the permanent magnet as the magnetic flux direction is generated perpendicular to the vertical plane. Arranged vertically along the flat coil 60 in the extending direction of the lever portion 55, because of the parallel arrangement of the magnetic circuit 70 and the flat coil 60, it can reduce the thickness of the width direction of the metering device.