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AssigneeMicrofine Materials Technologies Pte Ltd
InventorsShuangjie ZHANG, Leong Chew LIM, Dianhua LIN
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The invention provides a Diagonal Resonance (DR) mode for sound and ultrasound generation and reception. This new driving mode is made possible due to the anisotropic sound velocity in piezoelectric single crystals. This gives rise to a crossed slab active material, which contains the crossed-diagonals of the substantially rectangular shaped active material, exhibiting comparable resonance frequency. Due to reasonably large Piosson's ratios of lead-based relaxor single crystal, the resonance vibration of the active material in crossed face or body diagonal directions induces sufficiently large vibration amplitudes for sound and ultrasound generation via any free surface which could be normal or at an angle to the resonating diagonal directions. Said DR mode typically has lower resonance frequency than conventional longitudinal and transverse width modes but high TVR and can be combined or coupled with said two driving modes to make broadband to extra-broadband sonic and ultrasonic transducers.
A transducer comprising an active element of rectangular shape or substantially rectangular shape, electroded on two opposite faces and poled across the electrode faces,
A transducer comprising a longitudinal-mode active element of rectangular shape or substantially rectangular shape, electroded on two opposite faces and poled across the electrode faces,
A transducer comprising an active element of rectangular shape or substantially rectangular shape, electroded on two opposite faces and poled across the electrode faces,
Dependencies are inferred from the claim text.