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    • 5. 发明申请
    • COLLAPSED MODE OPERABLE CMUT INCLUDING CONTOURED SUBSTRATE
    • 收缩模式可操作,包括嵌入式基板
    • WO2009077961A2
    • 2009-06-25
    • PCT/IB2008/055279
    • 2008-12-12
    • KONINKLIJKE PHILIPS ELECTRONICS, N.V.PETRUZZELLO, JohnFRASER, John DouglasZHOU, ShiweiDUFORT, BenoitLETAVIC, Theodore James
    • PETRUZZELLO, JohnFRASER, John DouglasZHOU, ShiweiDUFORT, BenoitLETAVIC, Theodore James
    • B06B1/0292
    • A capacitive ultrasound transducer capable of operation in collapsed mode either with a reduced bias voltage, or with no bias voltage, is provided. The transducer includes a substrate that is contoured so that a middle region of the flexible membrane is collapsed against the substrate in the absence of a bias voltage. A non-collapsible gap may exists between the substrate and peripheral regions of the flexible membrane. The contour of the substrate may be such as to strain the flexible membrane past the point of collapse, or to mechanically interfere with the flexible membrane. The substrate may include a further membrane disposed beneath the flexible membrane, the further membrane being contoured so that the flexible membrane is collapsed against it. The substrate may a support disposed beneath the further membrane to deflect a corresponding portion of the further membrane upward toward the flexible membrane. The support may be a post. The transducer may be operated in collapse mode with an improved efficiency (k 2 eff ) as compared to otherwise similar conventional transducers exhibiting comparably uncontoured substrates. A related medical imaging system is provided, which may include an array of such transducers disposed on a common substrate. A method of operating such a transducer is provided that includes operating the transducer in the collapse mode in the absence of a bias voltage.
    • 提供能够以折叠模式操作或者具有降低的偏置电压或没有偏置电压的电容式超声换能器。 换能器包括基底,该基底的轮廓使得柔性膜的中间区域在没有偏置电压的情况下相对于基底折叠。 在柔性膜的基底和周边区域之间可能存在不可收缩的间隙。 衬底的轮廓可以是使柔性膜经过塌陷点,或机械地干涉柔性膜。 衬底可以包括设置在柔性膜下方的另一膜,另外的膜被成形为使得柔性膜相对于其折叠。 衬底可以是设置在另外的膜下方的支撑件,以将另外的膜的相应部分向上朝向柔性膜偏转。 支持可能是一个帖子。 传感器可以在崩溃模式下操作,与具有相当的未构图基底的其它相似的传统换能器相比,效率(k 2 eff)提高。 提供了一种相关的医学成像系统,其可以包括设置在公共基底上的这种换能器的阵列。 提供了一种操作这种换能器的方法,其包括在没有偏置电压的情况下以折叠模式操作换能器。