Patent ID: 7015623
Filing Date: 2006-03-21
Classification: H02N

Abstract:
1. A vibration type drive unit comprising: a vibration element consisting of an elastic member to which an electro-mechanical energy conversion element is fixed; a moving element which is in contact with a surface of said vibration element; a supporting member which penetrates inside of said vibration element to support the vibration element; a fitting member which fits into the supporting member to fix the vibration element to the supporting member, wherein said vibration element is in contact with said moving element at a surface of said vibration element opposite to a surface of said vibration element to which the electro-mechanical conversion element is fixed, a projection portion is formed on the surface of said vibration element with which said moving element is in contact, and the projection portion faces an inner diameter portion of said moving element, and generates, when an alternating signal is applied onto the electro-mechanical energy conversion element, a bending vibration of which a displacement direction is different from that generated on the surface of the vibration element with which said moving element is in contact, and wherein the electro-mechanical energy conversion element is disposed around the fitting member.