Patent ID: 9454954
Filing Date: 2016-09-27
CPC Classification: B06B,G01N,G10K,H01L

Claim Text:
1. A piezoelectric micromachined ultrasonic transducer (pMUT), comprising: a piezoelectric membrane disposed on a substrate; a reference electrode coupled to the membrane; and a first and second drive/sense electrode coupled to the membrane to drive or sense a first and second mode of vibration in the membrane; wherein the piezoelectric membrane has a circular or spheroidal or ellipsoidal geometry and is anchored to the substrate at a perimeter of the membrane, wherein the first drive/sense electrode has a circular or spheroidal geometry with a diameter smaller than that of the membrane and with a center aligned to a center of the membrane, and wherein the second drive/sense electrode has an annular geometry with a center aligned to the center of the membrane, with an outer diameter that is smaller than that of the membrane and with an inner diameter that is greater than an outer diameter of the first drive/sense electrode to circumscribe at least a portion of the first drive electrode.