Vibration generating apparatus

A vibration generating apparatus comprising:

• a pair of plate-like resilient bodies opposing each other within a frame body;
• one of said plate-like resilient bodies being provided with a magnetic field generating element so as to form a first vibration system;
• wherein said magnetic field generating element includes a yoke and a magnet;
• wherein said yoke attached to said one of said plate-like resilient bodies, with a center portion and an outer peripheral portion of said yoke being projected toward another plate-like resilient body, and said magnet disposed inside of the outer peripheral portion of said yoke;
• wherein said one of said plate-like resilient bodies is formed of a hat-like metal resilient body including a top portion, a bottom portion on the periphery of said top portion, and a connecting portion interconnecting said top and bottom portions;
• wherein
• the other of said plate-like resilient bodies being provided with a coil magnetically coupled to a magnetic field generated in said magnetic field generating element so as to form a second vibration system;
• wherein said other of said plate-like resilient bodies includes an annular groove to which said coil is fixedly positioned, and said coil being positioned in place between an inner peripheral side of said magnet and an outer circumferential side of the center portion of said yoke;
• wherein
• one of said first and second vibration systems has a higher resonance frequency than that of the other vibration system;
• one of said first and second vibration systems is selectively brought into vibration in correspondence to a frequency of an exciting current supplied to said coil while the other vibration system generates a sound in correspondence to another frequency;
• wherein said one of said plate-like resilient bodies constituting the first vibration system is arranged to vibrate in the direction of the center line of the frame body;
• and
• a soft resilient body is disposed on the inner circumferential surface of the frame body as spaced from the outer peripheral portion of the yoke for preventing the occurrence of abnormal sound caused by the yoke coming into contact with the inner circumferential surface of the frame body due to a drop impact.