Ultrasonic sensor and method for manufacturing the same
AssigneeMurata Manufacturing Co., Ltd.
InventorJyunshi Ota
Life of this patent
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Abstract
An ultrasonic sensor with stabilized transmitting/receiving characteristics capable of achieving a desired directivity easily and at low cost and a method for manufacturing the same are provided. The ultrasonic sensor includes a base composed of a synthetic resin. The base includes a cylindrical side portion and a ring-shaped bent portion extending inward from a first opening of the side portion. A ring-shaped recessed portion is provided in the inner surface of the bent portion adjacent to the end of the bent portion. A piezoelectric element is disposed on the recessed portion. A sound absorber and a weight are fitted and fixed in the base. An outer casing composed of a synthetic resin is provided so as to cover the outer surface of the piezoelectric element and the outer surface of the base.
Claims16
An ultrasonic sensor comprising:
- a piezoelectric element;
- a base sized to accommodate the piezoelectric element, the base having:
- a side portion that defines a first opening;
- and
- a bent portion extending inward from the first opening of the side portion, the bent portion having a recessed portion within which the piezoelectric element is disposed such that the first opening is closed by the piezoelectric element;
- and
- a casing covering an outer surface of the piezoelectric element and an outer surface of the base.
Dependencies are inferred from the claim text.