Patent ID: 7521839
Filing Date: 2009-04-21
Classification: G02B,H02N

Abstract:
1. An exciting method for an elastic vibration member comprising: arranging two support members each formed from an electro-mechanical energy transducer; supporting said elastic vibration member to said two support members at their front ends; and supplying drive signals having the same frequency and a phase difference to said two support members, circularly or elliptically vibrating said elastic vibration member, wherein said elastic vibration member has a body plate portion and a projecting portion, said projecting portion being formed on an upper surface of said body plate portion at its longitudinally central position, and a lower surface of said body plate portion at its longitudinally opposite ends being supported to said two support members, and wherein a thin-walled portion is formed between said projecting portion and each of the longitudinally opposite ends of said body plate portion.