Patent ID: 7170205

Claim:
An internal weight type vertical vibrator comprising: a housing defining an internal space having designated dimensions; a magnetic circuit unit placed in the internal space of the housing, and comprising a magnet perpendicularly placed and a yoke for fixedly receiving the magnet therein for generating a magnetic field having a designated intensity; spring members provided with upper ends fixed to the housing and lower ends fixed to the magnetic circuit unit for vertically and elastically supporting the magnetic circuit unit; a vibrating unit placed in the yoke so that the outer surface of the vibrating unit is surrounded by the yoke, comprising the weight having a hollow cylindrical structure provided with a central hole, into which the magnet is inserted, and vertically vibrated together with the vibration of the magnetic circuit unit through the spring members; and a vibration-generating coil placed just below the magnetic circuit unit so that the vibration-generating coil is interlinked with the magnetic field of the magnet for allowing current supplied from the outside to flow in one direction therethrough.