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    • 66. 发明授权
    • Method for fabricating a Z-axis conductive backing layer for acoustic
transducers using etched leadframes
    • 用于使用蚀刻引线框架制造用于声学换能器的Z轴导电背衬层的方法
    • US5592730A
    • 1997-01-14
    • US283136
    • 1994-07-29
    • Michael GreensteinHenry Yoshida
    • Michael GreensteinHenry Yoshida
    • G01N29/24A61B8/00B06B1/02B06B1/06H04R17/00H04R31/00H01L41/22
    • B06B1/0622Y10T29/42Y10T29/49005Y10T29/49121
    • A Z-axis backing layer for an acoustic transducer is provided, which comprises a matrix of electrical conductors disposed in parallel and potted within an electrically insulating acoustic backing material. The acoustic transducers are disposed on a first end of the backing layer, with each individual transducer element connecting electrically to a respective one of the conductors. At the other end of the backing layer, the conductors connect electrically to a corresponding circuit element. The backing layer is fabricated from a plurality of leadframes each having an outer frame member and a plurality of conductors extending in parallel across the leadframes terminating at the frame members at opposite ends thereof. The plurality of leadframes are stacked such that respective conductors of adjacent ones of the leadframes are disposed in parallel with a space provided between the respective conductors equivalent to a width of one of the leadframes. Acoustic backing material is poured onto the stacked plurality of leadframes to completely fill the spaces between conductors. The frame members and excess acoustic backing material are then removed from the stacked and poured plurality of leadframes.
    • 提供了一种用于声学换能器的Z轴背衬层,其包括平行放置并封装在电绝缘声学背衬材料内的电导体矩阵。 声学传感器设置在背衬层的第一端上,每个单独的换能器元件电连接到相应的导体之一。 在背衬层的另一端,电导体与相应的电路元件电连接。 背衬层由多个引线框架制成,每个引线框架具有外框架构件和多个导体,跨过引线框架并联延伸,终端于框架构件的相对端。 多个引线框架被堆叠,使得相邻的引线框架的各个导体与设置在相当于引线框之一的宽度的各个导体之间的空间平行设置。 声学衬垫材料被倒在堆叠的多个引线框架上以完全填充导体之间的空间。 然后将框架构件和多余的声学衬垫材料从堆叠和倒入的多个引线框架中移除。
    • 68. 发明授权
    • Electrical impedance normalization for an ultrasonic transducer array
    • 超声换能器阵列的电阻抗归一化
    • US5381067A
    • 1995-01-10
    • US29212
    • 1993-03-10
    • Michael GreensteinHewlett E. Melton, Jr.
    • Michael GreensteinHewlett E. Melton, Jr.
    • B06B1/06H01L41/08
    • B06B1/0622
    • A two-dimensional ultrasonic transducer array includes a plurality of transducer elements, with each element having a plurality of piezoelectric layers. The transducer elements vary in transverse areas of radiating regions. The effect of the variations in transverse areas on the electrical impedances of the elements is at least partially offset by varying the specific impedance, i.e., impedance per unit area, of the transducer elements in the array. In a preferred embodiment, the specific impedance is varied by selecting the electrical arrangements of piezoelectric layers in each element according to the transverse area of the element. Series, parallel and series-parallel arrangements are employed. This impedance normalization improves the electrical connection of the transducer elements to driving circuitry. In alternative embodiments, impedance normalization is achieved by varying element thicknesses, element materials and/or degrees of poling across the two-dimensional array.
    • 二维超声换能器阵列包括多个换能器元件,每个元件具有多个压电层。 换能器元件在辐射区域的横向区域中变化。 通过改变阵列中的换能器元件的特定阻抗,即单位面积的阻抗,至少部分地抵消横向区域中的变化对元件的电阻的影响。 在优选实施例中,通过根据元件的横向区域选择每个元件中的压电层的电气布置来改变特定阻抗。 采用串联,并联和串并联装置。 该阻抗归一化改善了换能器元件与驱动电路的电连接。 在替代实施例中,通过改变元件厚度,元件材料和/或穿过二维阵列的极化程度来实现阻抗归一化。
    • 69. 发明授权
    • Membrane hydrophone having inner and outer membranes
    • 膜水听器具有内膜和外膜
    • US5339290A
    • 1994-08-16
    • US49681
    • 1993-04-16
    • Michael Greenstein
    • Michael Greenstein
    • B06B1/06H04R17/00
    • H04R17/005B06B1/0688Y10S310/80
    • An acoustic device, such as a membrane hydrophone, includes a support structure and an outer membrane that suspends a transducer membrane within the interior of the support structure. The transducer membrane is selected for its acoustic and piezoelectric properties and is preferably a polymer such as P(VDF-TrFE). The outer suspension membrane is selected primarily for its mechanical properties. Portions of the suspension membrane may be removed in order to reduce mechanical drag encountered during movement of the device in a liquid. The transducer membrane includes at least one active area that is poled to provide a piezoelectrically strong region. Electrical charge generated at the active area is amplified at a preamp for transmission to remote equipment.
    • 诸如膜式水听器的声学装置包括将换能器膜悬挂在支撑结构内部的支撑结构和外膜。 选择换能器膜的声学和压电性质,并且优选为诸如P(VDF-TrFE)的聚合物。 外悬浮膜主要是为了其机械性能而选择的。 悬浮膜的部分可以被去除,以便减少装置在液体中运动期间遇到的机械阻力。 换能器膜包括至少一个有源区域,其被极化以提供压电强区域。 在有源区产生的电荷在前置放大器放大以传输到远程设备。