Patent ID: 7513158

Claim:
An ultrasonic sensor for use in an automotive vehicle, comprising: a receiving member for receiving ultrasonic waves reflected on an object to be detected, the receiving member having a first surface for receiving the ultrasonic waves and a second surface; a receiving element having a plurality of vibrating portions and supporting portions supporting the vibrating portions, the receiving element being mounted on the receiving member so that the vibrating portions are vibrated by the ultrasonic waves received by the receiving member and propagated to the vibrating portions via the supporting portions; and an intercepting slit for intercepting crosstalk between neighboring receiving regions, each formed in the receiving member to correspond to each vibrating portion, the intercepting slit being formed to separate neighboring receiving regions, extending in a direction substantially perpendicular to the second surface, and having an opening on the second surface and a closed end in the receiving member; wherein: the intercepting slit is formed to satisfy a formula: 0.35≦L/T≦0.60, where L is a depth of the intercepting slit and T is a thickness of the receiving member.