Patent ID: 11969757
Assignee: STMICROELECTRONICS S.R.L.
Field: Chemical engineering (Chemistry)
Classification: CPC B  H | IPC B  H

Claim 5:
6. An electronic system, comprising:
one or more Piezoelectric Micromachined Ultrasonic Transducer (PMUT) devices, each of the one or more PMUT devices including:
a silicon substrate including a first surface and a second surface opposite to the first surface, one or more lateral walls that extend into the second surface of the silicon substrate;
a membrane element configured to, in operation, generate and receive ultrasonic waves by oscillating about an equilibrium position at a resonance frequency, the membrane element having a first thickness;
anchor portions fixing the membrane element to the silicon substrate, the anchor portions being directly and physically coupled to a majority of the first surface of the silicon substrate, the anchor portions having a second thickness greater than the first thickness;
one or more notches delimited by the membrane element, the anchor portions, and the first surface of the silicon substrate; and
a piezoelectric element on the membrane element, the piezoelectric element is spaced inward the piezoelectric element configured to:
cause the membrane element to oscillate when electric signals are applied to the piezoelectric element; and
generate electric signals in response to oscillations of the membrane element, and

wherein the membrane element and the anchor portions are made of monocrystalline silicon, and no other material is directly or physically coupled to the first surface of the silicon substrate other than the anchor portions.