Patent ID: 9064486
Filing Date: 2015-06-23
Classification: B06B,G10K

Abstract:
1. An ultrasonic sensor comprising: a case including a bottom portion and a side wall portion that define an inner space; a piezoelectric element located within the inner space of the case and attached to the bottom portion of the case; a terminal positioned within the inner space of the case and extending outside the case; a conductive member that connects the terminal and an electrode of the piezoelectric element; a first filler located within the inner space of the case so as to contact the side wall portion of the case; and a second filler surrounding the terminal, wherein the first filler has a modulus of elasticity higher than that of the second filler, wherein the side wall portion of the case includes a first section adjacent the bottom portion and a second section adjacent the first section, the first section being thicker than the second section, and the first section includes a hollow portion sized to accommodate the piezoelectric element, the ultrasonic sensor further comprising: a reinforcement at the first section of the side wall portion and disposed so as to not contact the second section of the side wall portion; an elastic member disposed on the reinforcement and between the second filler and the piezoelectric element and not contacting the side wall portion of the case, such that a gap between the side wall portion and the elastic member is filled with the first filler; and a sound absorber disposed between the piezoelectric element and the elastic member.