Ultrasonic vibration device for hairstyling and hair styling apparatus having the same

A hairstyling apparatus comprising:

• an ultrasonic vibration device having a vibration element for generating ultrasonic vibrations and a horn for amplifying vibrations generated by and transmitted from the vibration element;
• a main body into which the ultrasonic vibration device is provided so that the ultrasonic vibration device is fixed on the main body at portions where nodes of vibration locate;
• a lever which is rotatably hinged with the main body at an end thereof;
• a compression plate fixed on the lever so as to face a vibration exit surface of the horn of the ultrasonic vibration device;
• and
• a driving circuit built in the main body for driving the ultrasonic vibration device, wherein
• the horn has a vibration entrance surface of an oblong rectangular shape to which the vibration element is attached and connected and through which the vibrations generated by the vibration element enters into the horn, and a vibration exit surface opposite to the vibration entrance surface through which the vibrations propagated in the horn exits;
• and
• the horn has a rectangular cross sectional shape in a longitudinal direction of the oblong rectangular shape of the vibration entrance surface so that a vertex of the vibration exit surface is flat, and a cross sectional shape in a lateral direction of the oblong rectangular shape so that a width in the lateral direction becomes gradually narrower from the vibration entrance surface to the vibration exit surface, and the vibration exit surface has at least a convex portion.