Transducer
AssigneeRohm Co., Ltd.
InventorsTakashi NAIKI, Takaya NAGAHATA
Life of this patent
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Abstract
A transducer includes a piezoelectric element that includes a piezoelectric membrane which is interposed between a pair of electrodes, a membrane body that includes a vibration membrane displaceable in a membrane thickness direction, the piezoelectric element being laminated on the vibration membrane, a package that includes an internal space which houses the piezoelectric element and the membrane body, and an abutment pad that is disposed in the internal space and limits displacement of the vibration membrane by abutting the piezoelectric element or the vibration membrane when the vibration membrane is displaced in the membrane thickness direction.
Claims20
A transducer comprising:
- a piezoelectric element that includes a pair of electrodes and a piezoelectric membrane which is interposed between the pair of electrodes;
- a membrane body that includes a vibration membrane displaceable in a membrane thickness direction, the piezoelectric element being laminated on the vibration membrane;
- a package that includes an internal space which houses the piezoelectric element and the membrane body;
- and
- an abutment member that is disposed in the internal space and limits displacement of the vibration membrane by abutting the piezoelectric element or the vibration membrane when the vibration membrane is displaced in the membrane thickness direction.
A transducer comprising:
- a membrane support portion that includes a cylindrical inner peripheral surface which forms a hollow portion;
- a vibration membrane that has a whole periphery connected to the inner peripheral surface and is displaceable in a membrane thickness direction;
- a piezoelectric element that includes a pair of electrodes and a piezoelectric membrane interposed between the pair of electrodes, and is laminated on the vibration membrane;
- and
- a dividing slit that penetrates a vibrator in which the vibration membrane and the piezoelectric element are laminated in a thickness direction, and divides the vibrator into a plurality of vibration regions, wherein
- the inner peripheral surface has:
- a polygonal shape in which a plurality of flat portions are connected via a chamfered corner portion, and
- the dividing slit includes:
- a main slit portion that extends from a center of the vibration membrane toward the corner portion;
- and
- a sub-slit portion that extends from a connecting portion which connects the corner portion and the flat portions, to an end portion of the main slit portion on a side of the corner portion.
A transducer comprising:
- a membrane support portion that includes a cylindrical inner peripheral surface which forms a hollow portion;
- a vibration membrane that has a whole periphery connected to the inner peripheral surface and is displaceable in a membrane thickness direction;
- a piezoelectric element that includes a pair of electrodes and a piezoelectric membrane interposed between the pair of electrodes, and is laminated on the vibration membrane;
- and
- a dividing slit that penetrates a vibrator in which the vibration membrane and the piezoelectric element are laminated in a thickness direction, and divides the vibrator into a plurality of vibration regions, wherein
- the inner peripheral surface has a polygonal shape in which a plurality of flat portions are connected via a corner portion,
- the dividing slit extends from a center of the vibration membrane toward the corner portion, and
- the piezoelectric element includes a piezoelectric slit that penetrates the piezoelectric element in a thickness direction and extends from the flat portions to the dividing slit along a vertical direction of the flat portions.
Dependencies are inferred from the claim text.