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1.发明授权公开(公告)号：US11633761B2
公开(公告)日：2023-04-25
申请号：US16952506
申请日：2020-11-19
摘要： Provided is a driving apparatus that sets a signal wave in a low-frequency region having a frequency of 10 Hz or more and 250 Hz or less as a modulating wave and outputs to a piezoelectric actuator a driving signal having a waveform obtained by modulating an amplitude of a sine wave in a high-frequency region having a frequency of 20 kHz or more and 40 kHz or less with the modulating wave.
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公开(公告)号：US10433073B2
公开(公告)日：2019-10-01
申请号：US16044339
申请日：2018-07-24
发明人： Shigeo Ishii , Hiroshi Hamada , Yutaka Doshida , Takashi Tomita
IPC分类号： H04R23/02 , H04R17/00 , H04R7/12 , H04R9/06 , H04R1/24 , H04R29/00 , H04R3/14 , H04R1/10 , H04R31/00
摘要： An electroacoustic transducer includes a dynamic speaker that generates a first acoustic sound, and a piezoelectric speaker that generates a second acoustic sound. The sum of the sound pressures of the first and second acoustic sounds in a crossover frequency range of the sound pressure of the first acoustic sound and the sound pressure of the second acoustic sound, is adjusted to be equal to or greater than 0.5 times the sound pressure of the first acoustic sound in the crossover frequency range so as to improve the acoustic properties in the crossover frequency range.
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公开(公告)号：US10121956B2
公开(公告)日：2018-11-06
申请号：US15514793
申请日：2015-08-31
发明人： Takashi Tomita , Shigeo Ishii , Hiroshi Hamada , Yutaka Doshida
IPC分类号： H01L41/047 , H01L41/293 , H04R7/04 , H04R17/00 , H01L41/083 , H01L41/113 , H01L41/297 , B06B1/06
摘要： An electroacoustic transducer includes: a polygonal-shaped laminated piezoelectric element including alternately stacked piezoelectric layers and electrode layers, with the piezoelectric layers placed between at least one pair of electrode layers having different polarities; and a circular vibration plate on which the laminated piezoelectric element is placed. Of the piezoelectric layers sandwiched between the at least one pair of electrode layers, the total volume (V) of those effective layers that overlap the at least one pair of electrode layers as viewed from the stacking direction satisfies the condition below: 0.2πR2×ts≤V≤2.0πR2×ts wherein π represents the ratio of the circumference of a circle to its diameter, R represents the radius of the vibration plate, and ts represents the thickness of the vibration plate.
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公开(公告)号：US09654881B2
公开(公告)日：2017-05-16
申请号：US14935372
申请日：2015-11-06
IPC分类号： H04R25/00 , H04R17/00 , H04R17/10 , H04R31/00 , H04R1/10 , H04R1/24 , H04R1/28 , H04R5/033 , H04R7/20
CPC分类号： H04R17/00 , H04R1/1075 , H04R1/24 , H04R1/2842 , H04R5/033 , H04R7/20 , H04R17/10 , H04R31/003 , H04R31/006 , H04R2205/022 , H04R2217/01 , H04R2499/11
摘要： An electroacoustic transducer has a housing, piezoelectric speaker, dynamic speaker, and support member. The piezoelectric speaker includes a vibration plate having a first surface and a second surface on the opposite side of the first surface, as well as a piezoelectric element joined to at least one of the first surface and second surface, and divides the interior of the housing into a first space facing the first surface and a second space facing the second surface. The dynamic speaker is placed in the first space. The support member is constituted by a part of the housing or by a member different from the housing, has a supporting part facing the first surface or second surface, and supports the periphery of the first surface or second surface with the supporting part.
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公开(公告)号：US11711030B2
公开(公告)日：2023-07-25
申请号：US17207241
申请日：2021-03-19
摘要： A driving device generates a driving signal and outputs the driving signal to a piezoelectric element, the driving signal having a waveform obtained by using, as a first modulated wave, a first low-frequency wave having a frequency of 1 Hz or more and less than 100 Hz, using, as a second modulated wave, a waveform obtained by modulating an amplitude of a second low-frequency wave having a frequency of 100 Hz or more and 300 Hz or less with the first modulated wave, and modulating a high-frequency wave having a frequency of 20 kHz or more and 100 kHz or less with the second modulated wave.
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公开(公告)号：US11571712B2
公开(公告)日：2023-02-07
申请号：US17007355
申请日：2020-08-31
发明人： Shigeo Ishii , Fumihisa Ito , Yukihiro Matsui , Hiroshi Hamada
IPC分类号： B06B1/06 , G08B6/00 , H01L41/047 , H01L41/053 , H01L41/09 , H01L41/187 , H04R17/00 , H01L41/083
摘要： Provided is a vibration panel including an inner member, a first outer member, a second outer member, a piezoelectric actuator, an actuator bonding layer, and a filler. The inner member includes first and second main surfaces. The first outer member includes third and fourth main surfaces, the third main surface including a first region and a second region. The second outer member includes fifth and sixth main surfaces, the fifth main surface including a third region and a fourth region. The piezoelectric actuator causes vibration. The actuator bonding layer is disposed between the piezoelectric actuator and the second region and bonds the piezoelectric actuator to the second region. The filler fills a space between the second region and the fourth region and covers the piezoelectric actuator.
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公开(公告)号：US10897674B2
公开(公告)日：2021-01-19
申请号：US15902889
申请日：2018-02-22
发明人： Shigeo Ishii , Hiroshi Hamada , Yutaka Doshida , Takashi Tomita
IPC分类号： H04R17/00 , H04R7/04 , H04R9/06 , H04R23/02 , H04R1/24 , H04R7/18 , H04R1/10 , H04R5/033 , H04R7/14
摘要： An electroacoustic transducer includes a piezoelectric speaker and a housing. The piezoelectric speaker has: a first vibration plate with a periphery; a piezoelectric element placed on at least one face of the first vibration plate; and multiple openings that are provided around the piezoelectric element and penetrate through the first vibration plate in its thickness direction that is a first axis direction. The housing has: a supporting part that directly or indirectly supports the periphery; and a sound introduction port that faces the piezoelectric speaker in the first axis direction. The sound introduction port is provided at a position where it does not overlap, in the first axis direction, a first opening having the largest open area among the multiple openings. The electroacoustic transducer can improve the acoustic characteristics of a piezoelectric speaker.
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公开(公告)号：US09973857B2
公开(公告)日：2018-05-15
申请号：US14970461
申请日：2015-12-15
发明人： Yasukazu Tokuhisa , Takashi Tomita , Hiroshi Hamada , Shigeo Ishii , Yutaka Doshida , Yoshiyuki Watanabe
CPC分类号： H04R17/005 , H04R1/06
摘要： A piezoelectric speaker has a piezoelectric element and vibration plate. The piezoelectric element has a base body with a mounting surface, as well as first and second terminals that are formed on the mounting surface with a distance between them. The vibration plate has a conductive body joined to the piezoelectric element and having a principle surface facing the mounting surface, as well as a first hole with or without a bottom which is formed on the principle surface in a region facing the first terminal to form a space between the body and first terminal. The piezoelectric speaker is capable of preventing the external electrodes of the piezoelectric element from shorting to each other.
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公开(公告)号：US20140319968A1
公开(公告)日：2014-10-30
申请号：US14360283
申请日：2012-12-18
IPC分类号： H01L41/083 , H01L41/09
CPC分类号： H01L41/083 , H01L41/0926 , H04R7/10 , H04R17/00 , H04R2499/11
摘要： A piezoelectric drive element includes piezoelectric layers, electrode layers between the piezoelectric layers, and electrode layers as the surfaces of the laminated layers. The piezoelectric layers are arranged on the upper side and on the lower side with reference to the center in the thickness direction, and are polarized in opposite directions. The thicknesses of piezoelectric layers at the center which have the least displacement are the thickest. The thicknesses of the piezoelectric layers above and under the thickest piezoelectric layers decrease gradually in an outward direction. A piezoelectric sound-generating body is constructed by affixing the piezoelectric driving element to a support plate and supporting the piezoelectric driving element with a frame.
摘要翻译： 压电驱动元件包括压电层，压电层之间的电极层和作为层叠层表面的电极层。 压电体层相对于厚度方向的中心配置在上侧和下侧，并且在相反的方向上极化。 中心位置的压电层厚度最薄。 最厚的压电层之上和之下的压电层的厚度在向外的方向上逐渐减小。 通过将压电驱动元件固定在支撑板上并用框架支撑压电驱动元件来构成压电声产生体。
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10.发明授权公开(公告)号：US11744156B2
公开(公告)日：2023-08-29
申请号：US16049348
申请日：2018-07-30
发明人： Hiroshi Hamada , Hiroyuki Shimizu , Sumiaki Kishimoto , Yukihiro Matsui , Shigeo Ishii , Tomohiro Harada , Yukihiro Konishi
IPC分类号： H01L41/083 , H01L41/047 , H01L41/09 , H01L41/273 , H01L41/293 , H01L41/257 , H01L41/313 , H10N30/50 , H10N30/063 , H10N30/073 , H10N30/20 , H10N30/87 , G06F3/01 , H10N30/045 , H10N30/053
CPC分类号： H10N30/508 , H10N30/063 , H10N30/073 , H10N30/206 , H10N30/872 , G06F3/016 , H10N30/045 , H10N30/053 , H10N30/871
摘要： A multilayer piezoelectric element includes a ceramic body formed by a piezoelectric ceramic, and having first and second end face facing a longitudinal direction, first and second principal faces facing a thickness direction perpendicular to the longitudinal direction. A pair of external electrodes cover the first and second end faces, extend from the first and second end faces onto the first principal face via ridge parts connecting the end faces with the principal faces, and project in the thickness direction on the first principal face. Multiple internal electrodes are stacked inside the ceramic body and are connected alternately to the pair of external electrodes along the thickness direction. A surface electrode is provided on at least one of the first and second principal faces, and connected to the external electrode different from the one to which the internal electrode adjacent in the thickness direction is connected.
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