Abstract: There is provided a vibration generator that permits to operate by following a mechanical resonance point. The vibration generator 1 has a vibration generation portion 2 having an electromagnetic coil 13 and a magnet 11 float-fixed by a spring member 12. The electromagnetic coil 13 is square-wave driven to obtain vibration force. The vibration generator 1 comprises a driving control portion 10 for detecting a driving voltage of the electromagnetic coil 13 at a predetermined constant interval. By the driving control portion 10, a driving frequency of the electromagnetic coil 13 is made high when an induced voltage waveform of the driving voltage is of rightward increase type, and the driving frequency is made low when the induced voltage waveform is of leftward increase. This permits the driving frequency of the electromagnetic coil to be shifted to a resonance frequency of the vibration generation portion 2.

Abstract: There is provided a vibration generator 1 which is small sized but provides a sufficient vibration force and which is advantageous in assembly and packaging. A vibration generation portion of the vibration generator has a U-shaped leaf spring 2, 22 one end of which is fixed to a circuit board 6, a permanent magnet 3, 23 and an electromagnetic coil 4, 24. The permanent magnet is disposed on the leaf spring in a spaced confronting relation with the electromagnetic coil. The U-shaped leaf spring 2, 22 increase an actual length of the vibration portion to thereby lower a resonance frequency of the vibration portion so that vibration at the resonant point can be obtained and consequently a large vibration can be obtained efficiently by a small power. A power supply terminal device 30 can be provided for resiliently pressing from upward the vibration generation portion so that the power supply terminal device 30 serves not only as power source but also as a means for pressing an adhered portion of an adhesive tape.