Flexural plate sound transducer having low resonant frequency

Details Flexural plate sound transducer having low resonant frequency Flexural plate sound transducer having low resonant frequency

G - Physics

10

K

G10K 9/122 (2006.01) B06B 1/06 (2006.01) G01H 11/08 (2006.01) G01S 15/04 (2006.01)

Patent

CA 2260787

In a preferred embodiment, a flexural plate sound transducer (Figure 3, 150), including: a housing (152) having an open central volume (172); a flexural plate (154) attached around an inner surface of the housing (152) and extending across the central volume (172); at least one piezoelectric element (162, 164) attached to a surface of the flexural plate (154); and a mechanical hinge (194) formed in the flexural plate (154) and extending around the flexural plate (154) near an outer periphery thereof, the mechanical hinge (194) being formed such as to cause the flexural plate (154) to move in a substantially piston-like manner when the piezoelectric element (162, 164) is energized.

Selon un mode de réalisation préféré, un transducteur de son à plaque de flexion (Figure 3, 150) comprend un logement (152) doté d'un volume central ouvert (172); une plaque de flexion (154) fixée autour d'une surface interne du logement (152) et s'étendant à travers le volume central (172); au moins un élément piézo-électrique (162, 164) fixé à une surface de la plaque de flexion (154) ; et une charnière mécanique (194) formée dans la plaque de flexion (154) et s'étendant autour de la plaque de flexion (154) près d'une périphérie extérieure de celle-ci, le mécanisme de charnière (194) étant formé de façon à provoquer le déplacement de la plaque de flexion (154) d'une manière sensiblement identique à celle d'un piston lorsque l'élément piézo-électrique (162, 164) est excité.

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