FIELD: ultrasound devices. SUBSTANCE: shield is made as a plate having two working sides. One side is flat and is designed for acoustic connection to piezoelectric element. Another side is rough and has several grooves of rectangular shape. This surface interacts with the medium in operation mode. Area of grooves is half of total area of this surface and depth of grooves is an odd factor of quarter wave lengths of ultrasound in material of shield. EFFECT: facilitated manufacturing. 2 cl, 1 dwg
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