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公开(公告)号：US4395652A
公开(公告)日：1983-07-26
申请号：US186258
申请日：1980-09-11
CPC分类号： G10K11/32 , Y10S310/80
摘要： An ultrasonic transducer element includes a polymer piezoelectric film having a plurality of sections. The sections are defined by wave planes of ultrasonic waves having substantially .lambda./2 phase difference emanated from an imaginary focal point or line located in front of the piezoelectric film. .lambda. is the wave length of the ultrasonic waves within an acoustic transmission medium located between the piezoelectric film and the imaginary focal point or line. The sections are arranged so that ultrasonic waves emanated from adjacent sections have substantially no phase difference at the imaginary focal point or line. Front and rear electrodes are deposited on opposite surfaces of the piezoelectric film.
摘要翻译： 超声波换能器元件包括具有多个部分的聚合物压电薄膜。 这些部分由具有从位于压电膜前方的假想焦点或线发出的基本上λ/ 2相位差的超声波的波面限定。 λ是位于压电膜和虚拟焦点或线之间的声传播介质内的超声波的波长。 这些部分布置成使得从相邻部分发出的超声波在假想焦点或线处基本上没有相位差。 前后电极沉积在压电膜的相对表面上。
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公开(公告)号：US4383194A
公开(公告)日：1983-05-10
申请号：US143132
申请日：1980-04-23
CPC分类号： G10K11/02 , B06B1/0688 , Y10S310/80
摘要： Electro-acoustic transducer element having its resonant frequency in a lower frequency range advantageously usable for diagnostic purposes comprises a polymeric piezoelectric film such as polyvinylidene fluoride film being coupled with an additional layer having a thickness specified in relation to the wavelength of sound waves within the additional layer at the free resonant frequency of the polymeric piezoelectric film, the additional layer having an acoustic impedance related to the acoustic impedance of the polymeric piezoelectric film.
摘要翻译： 具有有利于用于诊断目的的较低频率范围内的谐振频率的电声换能器元件包括诸如聚偏二氟乙烯膜的聚合物压电膜与附加层耦合，附加层具有相对于额外的声波波长所规定的厚度 在聚合物压电薄膜的自由共振频率处，附加层具有与聚合物压电薄膜的声阻抗相关的声阻抗。
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公开(公告)号：US4424465A
公开(公告)日：1984-01-03
申请号：US434713
申请日：1982-10-15
CPC分类号： B06B1/0622 , Y10S310/80
摘要： A piezoelectric vibration transducer is disclosed which includes a polymeric piezoelectric film as the active element. The film is a selectively or fully polarized, uniaxially oriented material selected from the group of polyvinylidene fluoride, blended material such as polyvinylidene fluoride and PZT powder, polyvinyl fluoride, polyacrylonitrile, copolymers or vinylidene fluoride such as vinylidene fluoride and tetrafluoroethylene or trifluoroethylene. The film is bonded to electrode strips formed by printed circuit methods and then overcoated with a front electrode layer. The sandwich formed by the electrode layers and intermediate polymeric piezoelectric film can be reversed so that the front electrode layer is discontinuous while the back electrode layer is continuous, or both electrode layers can be formed to be discontinuous. Special configurations for the discontinuous pattern of electrode layers can be employed such as that specified by Fresnel's theory.
摘要翻译： 公开了一种压电振动传感器，其包括作为有源元件的聚合物压电膜。 该膜是选自聚偏二氟乙烯，聚偏二氟乙烯和PZT粉末，聚氟乙烯，聚丙烯腈，共轭或偏二氟乙烯如偏二氟乙烯和四氟乙烯或三氟乙烯的共混材料的选择性或完全极化的单轴取向材料。 将该膜粘合到通过印刷电路方法形成的电极条上，然后用前电极层涂覆。 由电极层和中间聚合物压电膜形成的夹层可以反转，使得前电极层不连续，而背电极层是连续的，或者两个电极层可以形成为不连续的。 可以采用电极层不连续图案的特殊配置，如菲涅耳理论规定的那样。
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公开(公告)号：US4296349A
公开(公告)日：1981-10-20
申请号：US120782
申请日：1980-02-12
CPC分类号： G10K11/28 , B06B1/0677 , Y10S310/80
摘要： Ultrasonic transducer advantageously usable for diagnostic purpose includes a piezoelectric element such as a PVDF film backed with a reflective layer of a reduced thickness specified in relation to the wavelength of sound waves within the reflective layer at one-half of the free resonant frequency of the piezoelectric element. Remarkable reduction in thickness assures high transfer efficiency, broad available frequency-band and easy application of fine treatments such as etching.
摘要翻译： 有利地用于诊断目的的超声波换能器包括压电元件，例如PVDF膜，其背面具有相对于反射层内的声波的波长规定的减小厚度的反射层，其厚度为压电自由共振频率的一半 元件。 厚度的显着降低确保了高转印效率，广泛的可用频带和易于应用精细处理如蚀刻。
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