Patent ID: 8763463

Claim:
An ultrasonic sensor comprising: a housing, the housing including a substrate retainer including an open portion and a bottom portion located opposite to the open portion, a transducer retainer arranged adjacent to the substrate retainer, and a communication bore arranged to open from the bottom portion of the substrate retainer and to communicate between the substrate retainer and the transducer retainer; a transducer retained in the transducer retainer; an electronic circuit substrate retained in the substrate retainer and including an electronic circuit for processing an ultrasonic signal transmitted and received via the transducer; a first lid laser-welded to the open portion of the substrate retainer to hermetically seal the substrate retainer against the entry of a liquid; and a second lid arranged inside the substrate retainer and laser-welded to the bottom portion of the substrate retainer to close the communication bore, wherein the first lid and the second lid are arranged so that a direction in which a laser beam is emitted in laser welding of the first lid is the same as that in laser welding of the second lid.