Microfabricated ultrasonic transducer having individual cells with electrically isolated electrode sections
First Claim
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1. A method, comprising:
- forming a plurality of cavities in a first side of a first substrate;
for one or more of the plurality of cavities, forming first isolation trenches in the first side of the first substrate;
bonding a second substrate to the first substrate to seal the cavities; and
forming second isolation trenches in a second side of the first substrate;
the bonded first and second substrates defining an ultrasonic transducer substrate having a membrane, a bottom electrode, and the plurality of cavities disposed between the membrane and the bottom electrode, each of the plurality of cavities corresponding to an individual transducer cell;
wherein portions of the bottom electrode corresponding to each individual transducer cell are electrically isolated from one another by the second isolation trenches; and
each portion of the bottom electrode corresponding to each individual transducer cell further comprising a first bottom electrode portion and a second bottom electrode portion, the first and second bottom electrode portions electrically isolated from one another by the first isolation trenches.
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Abstract
An ultrasonic transducer includes a membrane, a bottom electrode, and a plurality of cavities disposed between the membrane and the bottom electrode, each of the plurality of cavities corresponding to an individual transducer cell. Portions of the bottom electrode corresponding to each individual transducer cell are electrically isolated from one another. Each portion of the bottom electrode corresponds to each individual transducer that cell further includes a first bottom electrode portion and a second bottom electrode portion, the first and second bottom electrode portions electrically isolated from one another.
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Citations
22 Claims
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1. A method, comprising:
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forming a plurality of cavities in a first side of a first substrate; for one or more of the plurality of cavities, forming first isolation trenches in the first side of the first substrate; bonding a second substrate to the first substrate to seal the cavities; and forming second isolation trenches in a second side of the first substrate; the bonded first and second substrates defining an ultrasonic transducer substrate having a membrane, a bottom electrode, and the plurality of cavities disposed between the membrane and the bottom electrode, each of the plurality of cavities corresponding to an individual transducer cell; wherein portions of the bottom electrode corresponding to each individual transducer cell are electrically isolated from one another by the second isolation trenches; and each portion of the bottom electrode corresponding to each individual transducer cell further comprising a first bottom electrode portion and a second bottom electrode portion, the first and second bottom electrode portions electrically isolated from one another by the first isolation trenches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification