The present invention provides an acoustic transmission member (10) that provides a wide acoustic transmission band suitable for a high frequency region and ensures a certain strength. The acoustic transmission member (10) includes a core layer (104) layered between two skin layers (102A, 102B), the skin layers (102A, 102B) being formed of a material having a higher elastic modulus than a material of the core layer (104). A thickness ds of the skin layers is formed such that Equation (1) is satisfied, where f is the center frequency of the transmission frequency band, cw is the acoustic velocity in the medium surrounding the acoustic transmission member (10), » is the wavelength corresponding to the center frequency in the medium, cds is the longitudinal wave acoustic velocity in the skin layer, and n is a discretionary natural number. ds = n 2 Cds cw » = n 2 Cds f
Acoustic Transmission Member and Method of Designing Same
2019-04-04
Patent
Elektronische Ressource
Englisch
IPC: | B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM , Schichtkörper, d.h. aus Ebenen oder gewölbten Schichten, z.B. mit zell- oder wabenförmiger Form, aufgebaute Erzeugnisse / H04R LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS , Lautsprecher, Mikrofone, Schallplatten-Tonabnehmer oder ähnliche akustische, elektromechanische Wandler / B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / G01S RADIO DIRECTION-FINDING , Funkpeilung |
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