Patent ID: 8774871

Claim:
A vibration apparatus, comprising: a control unit to generate an electrical signal of a first frequency band and an electrical signal of a second frequency band; and an actuator to generate ultrasonic waves using the electrical signal of the first frequency band, and to generate vibrations using the electrical signal of the second frequency band, wherein the first frequency band is higher than the second frequency band, wherein the actuator generates a relatively stronger ultrasonic wave in the first frequency band compared to an ultrasonic wave generated by the actuator in the second frequency band, and the actuator generates a relatively stronger vibration in the second frequency band compared to a vibration generated by the actuator in the first frequency band, wherein the actuator generates vibrations in a plurality of frequency bands and generates ultrasonic waves in a plurality of frequency bands, wherein the actuator generates vibrations and ultrasonic waves in alternating frequency bands among the vibrations in the plurality of frequency bands and the ultrasonic waves in the plurality of frequency bands.