Ultrasonic sensor and method for manufacturing the same
AssigneeMurata Manufacturing Co., Ltd.
InventorsSeigo HAYASHI, Masanaga NISHIKAWA
Life of this patent
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Abstract
An ultrasonic sensor includes a cylindrical casing having a bottom portion. The casing has a piezoelectric element on a bottom surface thereof. A substrate is attached to an end surface of an opening portion of the casing with a damping member provided therebetween such that the damping member covers the opening portion. Pin terminals are arranged so as to extend through the substrate and the damping member and are electrically connected to the piezoelectric element with lead wires. An inner space of the casing is filled with foamable resin.
Claims13
An ultrasonic sensor, comprising:
- a casing having a bottom portion;
- a piezoelectric element disposed on an inner bottom surface of the casing;
- a terminal electrically connected to the piezoelectric element;
- a substrate to which the terminal is fixed;
- and
- a damping member;
- wherein
- the substrate is attached to the casing with the damping member provided therebetween, the damping member suppressing transmission of vibration;
- and
- the damping member is disposed between an end surface of the casing and a principal surface of the substrate so as to cover an opening portion of the casing.
A method for manufacturing an ultrasonic sensor, comprising:
- a step of disposing a piezoelectric element on an inner bottom surface of a casing having a bottom portion;
- a step of electrically connecting the piezoelectric element to a terminal fixed to a substrate;
- a step of forming a through hole to be filled with a filler in the substrate and a damping member to suppress transmission of vibration;
- a step of disposing the damping member between an end surface of an opening portion of the casing and a principal surface of the substrate such that the substrate is attached to the casing with the damping member provided therebetween and such that the damping member covers the opening portion of the casing;
- and
- a step of filling an inner space of the casing with the filler through the through hole extending through the substrate and the damping member.
Dependencies are inferred from the claim text.