Patent ID: 9085012
Filing Date: 2015-07-21
Classification: A61B,B06B,B81B,G01N,H04R

Abstract:
1. An ultrasonic transducer comprising: a first electrode; a lower insulating film formed on the first electrode; an upper insulating film provided so as to form a hollow part above the lower insulating film; a second electrode formed on the upper insulating film wherein: the lower insulating film or the upper insulating film has a plurality of projections formed on a side of the hollow part, and the first electrode or the second electrode has openings formed at positions corresponding to the positions at which the plurality of projections are formed; a first projection of the plurality of projections is formed on the upper insulating film or the lower insulating film at a position corresponding to at least a center of a membrane comprising the upper insulating film and the second electrode; a second projection of the plurality of projections is formed between the first projection and an edge of the hollow part; and a third projection of the plurality of projections is formed between the second projection and the edge of the hollow part; and provided that the first projection is contacted with the upper insulating film or the lower insulating film, and a part of the membrane on a straight line connecting the first projection and the edge of the hollow part is contacted with the lower insulating film by driving voltage applied to the first electrode and the second electrode, the second projection is formed on the contacting part of the membrane.