| 摘要 |
A sensor attachment structure includes a sound receiving member for receiving an ultrasound, an ultrasonic sensor attached to the sound receiving member. The ultrasonic sensor includes a semiconductor substrate having first and second surfaces opposite to each other and a substrate recess portion recessed from the first surface of the semiconductor substrate so as to form a membrane in the semiconductor substrate. Furthermore, a cap member is located between the sound receiving member and the semiconductor substrate to cover the second surface of the semiconductor substrate. In addition, the cap member has a first surface bonded to the sound receiving member, and a second surface that is bonded to the second surface of the semiconductor substrate at an outer periphery section of the membrane while having a gap between the cap member and the membrane.
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