Patent ID: 8764201
Filing Date: 2014-07-01
Classification: B06B,G02B,G03B,H02P

Abstract:
1. A vibration member driving circuit which causes vibrations in a vibration member at least including a first electro-mechanical energy conversion element, a second electro-mechanical energy conversion element, and an elastic body by applying alternating voltage to the first electro-mechanical energy conversion element and the second electro-mechanical energy conversion element fixed to the elastic body, the circuit comprising: an inductor and a capacitor serially connected to the first electro-mechanical energy conversion element and the second electro-mechanical energy conversion element, wherein is satisfied where fs is a series resonance frequency by the inductor and the capacitor and fm is a resonance frequency of the vibration member, and wherein alternating voltages having different phases are applied to the first and second electro-mechanical energy conversion elements, respectively, and wherein the alternating voltages have a frequency which generates, in the vibration member, a vibration obtained by superposing a vibration in a first vibration mode and a vibration in a second vibration mode different from the first vibration mode in order.