In Japan Patent Application Nos. 67,013/84 and 69,929/84, the present inventor proposed vibratory apparatuses which are directed for hypnosis and dehypnotization, as well as for therapy of myalgia and stiffness in the shoulder.
These apparatuses, however, have the disadvantage that they consume a relatively large amount of electricity to radiate heat when used for a long duration, because these apparatuses are of forced vibration-type wherein a magnetic coil and an iron core are attached to the same iron plate.