ELECTROACOUSTIC TRANSDUCER WITH BUILT-IN RLC-FILTER Russian patent published in 2025 - IPC H04R1/44 H04R17/00 

FIELD: acoustics.

SUBSTANCE: electroacoustic transducer with an RLC filter has a cover provided with a connector, a membrane in the form of a thin plate, a housing having the shape of a stepped body of revolution and an inner cavity. One of the sections of the housing is an acoustic filter with natural frequency equal to the operating frequency of the transducer. Converter also comprises two rings, a thin-walled section, a damping bushing installed in the area of the thin-walled section, an L-shaped bend, a matching mass, a waveguide made tapering, wherein its second end adjoins the membrane, a spring made in the form of a thin-walled cylinder with radial slots arranged in a staggered order and forming bending sections, one end of which is connected to the matching mass, and the other to the waveguide, a pair of polarized piezoelectric elements made in the form of rings or discs clamped between the second end of the matching mass and the end of the waveguide, electrode installed between piezoelectric elements, signal wire connected to electrode, an electrical insulator placed inside the housing, a control resistor placed inside the insulator, having a first contact connected to the connector, and a second contact, an inductance arranged inside the insulator, having a first contact connected to the second contact of the resistor, and a second contact connected to the second end of the wire.

EFFECT: high sensitivity and signal-to-noise ratio.

19 cl, 6 dwg