Patent ID: 9550211
Date: 2017-01-24
CPC Classifications: B06B,B81B,Y10T

Claim:
1. A CMUT device comprising, a silicon substrate, a cavity, a membrane, the membrane and the silicon substrate each being arranged to form sides of the cavity, said sides being located opposite to each other, a first electrode arranged adjacent and parallel to the cavity, and being arranged contiguous to the silicon substrate, and a second electrode arranged adjacent and parallel to the cavity, opposite to the first electrode and being embedded in the membrane, wherein the CMUT device is adapted to reduce a temperature induced deflection of the membrane, h, according to: where h is the temperature induced deflection of the membrane towards the substrate at a centre point of the cavity, s M is the thermally induced momentum of the membrane, D is the flexural rigidity of a plate, r r h v is the Poisson ratio, S is the thermal stress in the membrane, E is Young's modulus for the material of the membrane, E ΔT is a temperature change, and α is an expansion coefficient of a material, α