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公开(公告)号：US5684884A
公开(公告)日：1997-11-04
申请号：US456101
申请日：1995-05-30
申请人： Chitose Nakaya , Shigeru Jomura , Juro Endo
发明人： Chitose Nakaya , Shigeru Jomura , Juro Endo
CPC分类号： H04R17/00
摘要： Disclosed is a piezoelectric loudspeaker. According to the present invention, a piezoelectric loudspeaker comprises: a flat compound piezoelectric sheet in which multiple piezoelectric devices are arranged in an organic material; electrodes which are provided on respective surfaces of the compound piezoelectric sheet; an acoustic impedance matching support layer for maintaining the flat compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; and a support frame for supporting the compound piezoelectric sheet at its circumference. Thus, sound reproduction with a desirable frequency properties that have little distortion can be performed.
摘要翻译： 公开了一种压电扬声器。 根据本发明，压电扬声器包括：平面复合压电片，其中多个压电器件布置在有机材料中; 设置在复合压电片的各个表面上的电极; 声阻抗匹配支撑层，用于将扁平化合物压电片保持在弯曲形状并用于匹配声阻抗; 以及用于在其圆周处支撑复合压电片的支撑框架。 因此，可以执行具有很小变形的期望频率特性的声音再现。
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公开(公告)号：US4211926A
公开(公告)日：1980-07-08
申请号：US901241
申请日：1978-04-28
申请人： Chitose Nakaya , Hideki Kohno , Hidemi Shiono , Kensuke Sekihara , Shinji Yamamoto , Teruichi Tomura , Takayuki Hayakawa
发明人： Chitose Nakaya , Hideki Kohno , Hidemi Shiono , Kensuke Sekihara , Shinji Yamamoto , Teruichi Tomura , Takayuki Hayakawa
CPC分类号： A61B6/032
摘要： In a system in which the tomographic image of an object under investigation is produced on the basis of the amount of absorption of radiation by the object when a source of radiation and a plurality of radiation sensitive detectors with the object interposed therebetween are rotated around the object, the output signal from at least one of the plural detectors is used to correct the radiation absorption amount. Another selected one of the plural detectors may be used for checking whether the object is positioned within a useful detection view.
摘要翻译： 在这样一个系统中，在被照明物体插入其间的物体的多个辐射敏感探测器围绕物体旋转时，基于物体的辐射吸收量产生被研究对象的断层图像 使用来自多个检测器中的至少一个的输出信号来校正辐射吸收量。 多个检测器中的另一选择的一个可以用于检查对象是否位于有用的检测视图内。
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公开(公告)号：US4680499A
公开(公告)日：1987-07-14
申请号：US849833
申请日：1986-04-09
CPC分类号： G10K11/02
摘要： A monolithic array ultrasonic transducer has a plurality of transducer elements formed thereon by isolating metallized areas on a piezoelectric plate without cutting the piezoelectric plate apart for each transducer element, and an acoustic matching layer having a longitudinal wave velocity within .+-.25% of a longitudinal wave velocity of the piezoelectric plate and a thickness equal to one half of that of the piezoelectric plate. The acoustic matching layer suppresses the radiation to an object of a partial wave in a direction of 60.degree. to a normal line to the plane of the piezoelectric plate.
摘要翻译： 单片阵列超声波换能器通过隔离压电板上的金属化区域而形成多个换能器元件，而不将每个换能器元件的压电板分开切割，并且具有纵向波速度在±25％以内的声匹配层 压电板的纵波速度和厚度等于压电板的一半的厚度。 声匹配层将辐射抑制到与压电板的平面相对于法线的60°的方向上的部分波的物体。
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4.发明授权
公开(公告)号：US5502384A
公开(公告)日：1996-03-26
申请号：US243907
申请日：1994-05-17
申请人： Chitose Nakaya , Yoshitaka Bito , Etsuji Yamamoto , Hiroshi Nishimura , Hiroyuki Takeuchi , Shigeru Watanabe , Akihiro Miyajima , Hitoshi Arai
发明人： Chitose Nakaya , Yoshitaka Bito , Etsuji Yamamoto , Hiroshi Nishimura , Hiroyuki Takeuchi , Shigeru Watanabe , Akihiro Miyajima , Hitoshi Arai
IPC分类号： A61B5/055 , G01R33/28 , G01R33/561 , G01R33/565 , G01R33/20
CPC分类号： G01R33/565 , G01R33/561
摘要： In an image reconstruction method in a nuclear magnetic resonance imaging apparatus, the method comprises first and second steps to get detected data S.sub.I for at least about half of region inclusive of an origin and data S.sub.IV in a region symmetric with respect to a line passing through an origin on one of axes from the detected region in the acquired data space and parallel to the other axis, respectively, third and fourth steps to perform inverse Fourier transform on the data S.sub.I and S.sub.IV, respectively, a fifth step to get a complex conjugate value of the result obtained from Step 3, a sixth step to get a complex conjugate value of the result obtained from Step 4, a seventh step to calculate a phase map from the results obtained from the second, third, fourth, fifth and sixth steps, an eighth step to multiply the result obtained from step 6 by the phase map obtained from step 7 and to obtain a phase corrected data, and a ninth step to sum the result obtained from the third step and the result obtained from the eighth step. The method can thus obtain the whole reconstructed image.
摘要翻译： 在核磁共振成像装置中的图像重建方法中，该方法包括第一和第二步骤，用于在相对于通过的线对称的区域中获得包含原点和数据SIV的区域的至少约一半的检测数据SI 在获取的数据空间中的检测区域中的一个轴上的原点，并且平行于另一个轴的原点;第三和第四步骤，分别对数据SI和SIV执行逆傅里叶变换，第五步骤以获得复共轭 从步骤3获得的结果的值，第六步骤，获得从步骤4获得的结果的复共轭值，第七步骤，从根据从第二，第三，第四，第五和第六步骤获得的结果计算相位图 第八步，将从步骤6获得的结果乘以从步骤7获得的相位图，并获得相位校正数据;第九步骤，将从第三步骤获得的结果与res 从第八步获得。 因此，该方法可以获得整个重建图像。
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公开(公告)号：US4683396A
公开(公告)日：1987-07-28
申请号：US661928
申请日：1984-10-17
CPC分类号： B06B1/0622
摘要： A ultrasonic transducer using such a piezoelectric composite that a number of piezoelectric poles made of piezoelectric ceramics are arranged in a plate-like polymer matrix perpendicular to the plate surface. The volume ratio of the piezoelectric poles is set in a range of 0.15-0.75 and a spacing between every adjacent piezoelectric poles is set smaller than the thickness of the polymer plate, thereby resulting in a transducer which has higher sensitivity than the conventional one using a homogeneous piezoelectric ceramic plate.
摘要翻译： 使用这样一种压电复合材料的超声波换能器，其中多个由压电陶瓷制成的压电极被布置在垂直于板表面的板状聚合物基体中。 压电极的体积比设定在0.15-0.75的范围内，相邻的压电极之间的间隔设定为小于聚合物板的厚度，从而得到比使用 均质压电陶瓷板。
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公开(公告)号：US4597293A
公开(公告)日：1986-07-01
申请号：US689955
申请日：1985-01-09
CPC分类号： G01N29/06 , G10K11/02 , G01N2291/02854
摘要： An acoustic microscope wherein an ultrasonic beam is projected on a sample through a propagating medium by an ultrasonic transducer having a short focus, reflected acoustic waves from the sample are detected by the transducer, and a microscopic image of the sample is obtained by scanning the sample mechanically in two dimensions, comprises a cover member which is interposed between the sample and the propagating medium and which has an acoustic impedance higher than those of the two. The intensity of a reflection signal depends upon multipath reflection within the cover member, and an intense reflection signal is obtained even for a sample which differs slightly in the acoustic impedance from the propagating medium.
摘要翻译： 一种声学显微镜，其中超声波束通过具有短焦距的超声波换能器通过传播介质投射在样本上，由换能器检测来自样品的反射声波，并通过扫描样品获得样品的显微图像 在两个维度上机械地包括盖构件，其插入在样品和传播介质之间，并且具有比两者更高的声阻抗。 反射信号的强度取决于盖构件内的多径反射，并且即使对于声阻抗与传播介质略有差异的样本也可获得强反射信号。
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公开(公告)号：US4736631A
公开(公告)日：1988-04-12
申请号：US904099
申请日：1986-09-04
IPC分类号： G01N29/26 , A61B8/00 , B06B1/06 , G01N29/04 , G01N29/24 , H04R3/00 , H04R17/00 , H04R17/08 , G01N29/00
CPC分类号： G01N29/245 , B06B1/0629 , H04R17/08
摘要： Disclosed is an ultrasonic probe which is capable of externally and selectively controlling the conversion efficiency of an electroacoustic conversion portion. For the electroacoustic conversion portion is used a material which does not exhibit or exhibit the piezoelectricity depending on the absence or the presence of bias electric field, for example, a certain kind of ferroelectric material which is maintained at a temperature in the vicinity of the phase transition temperature thereof or a material having high electrostrictive effect. The electroacoustic conversion efficiency is controlled by applying bias electric field to such a material.
摘要翻译： 公开了能够从外部选择性地控制电声转换部的转换效率的超声波探头。 对于电声转换部，使用根据偏置电场的不存在或不存在而不显示或显示压电性的材料，例如，保持在相位附近的温度的某种铁电体材料 其转变温度或具有高电致伸缩效应的材料。 通过向这种材料施加偏置电场来控制电声转换效率。
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公开(公告)号：US4658176A
公开(公告)日：1987-04-14
申请号：US758029
申请日：1985-07-23
CPC分类号： B06B1/0622 , G10K11/002
摘要： An ultrasonic transducer using a piezoelectric composite in which a plurality of piezoelectric poles are arranged in matrix maintaining a gap and a polymer is charged into the gap. The piezoelectric poles are arranged maintaining a pitch which is shorter than a wavelength of a sound wave at a fundamental resonance frequency of the transducer in a medium. Further the pitch may be changed in a direction in which the piezoelectric poles are arranged, in order to restrain the grating lobe from generating.
摘要翻译： 一种使用压电复合体的超声波换能器，其中多个压电极排列成矩阵，保持间隙，聚合物被填充到间隙中。 压电极被布置为保持在介质中的换能器的基本共振频率处的声波的波长短的音调。 此外，可以在排列压电极的方向上改变间距，以便抑制栅瓣的产生。
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公开(公告)号：US4572201A
公开(公告)日：1986-02-25
申请号：US659672
申请日：1984-10-11
申请人： Shinichi Kondo , Chitose Nakaya , Shizuo Ishikawa
发明人： Shinichi Kondo , Chitose Nakaya , Shizuo Ishikawa
CPC分类号： A61B8/4461 , A61B8/12 , A61B8/445
摘要： A probe which is inserted into a lumen to obtain an ultrasonic tomogram using mechanical scanning is disclosed. A cylindrical acoustic case is filled with a liquid medium which transmits sound waves, and an elliptical ultrasonic transducer is immersed therein in such a manner that it can be rotated by a motor. The diameter of the transducer parallel to its axis of rotation is greater than that perpendicular to the axis of rotation, so that the lateral resolution parallel to the axis of rotation is improved, as well as the sensitivity.
摘要翻译： 公开了一种使用机械扫描插入内腔以获得超声波断层图像的探针。 圆柱形的声学壳体填充有传播声波的液体介质，并且椭圆形超声波换能器以可由马达旋转的方式浸入其中。 平行于其旋转轴的传感器的直径大于垂直于旋转轴线的直径，从而提高了平行于旋转轴的横向分辨率以及灵敏度。
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公开(公告)号：US5097709A
公开(公告)日：1992-03-24
申请号：US479172
申请日：1990-02-13
CPC分类号： G01S15/8925 , B06B1/0629 , G10K11/34 , H04R17/08
摘要： An ultrasonic measuring system including a transducer having a plurality of row electrodes on one surface thereof and a plurality of column electrodes crossing the plurality of row electrodes on the other surface thereof and made of an electrostrictive material in which piezoelectricity is induced by a bias electric field applied thereto to thereby obtain sectional images sequentially. A row position selector is connected to the row electrodes to select several row electrodes and apply a direct current bias voltage to the selected electrode and to shift the position of the selection sequentially. An electronic B-mode image scanner is connected to the column electrodes to shift the directivity of the transmission/reception ultrasound beams sequentially widthwise of the column electrodes (in the direction of row extension) to obtain echo signals indicative of an acoustic reflective response. An acoustic lens may be provided over the entire surface of the transducer so as to be moved synchronously with selection of the row electrodes by the row position selector.
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