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1.发明申请公开(公告)号：US20190044054A1
公开(公告)日：2019-02-07
申请号：US16051605
申请日：2018-08-01
IPC分类号： H01L41/09 , H01L41/047 , H01L41/083 , H01L41/187
摘要： A piezoelectric material which is low in load on the environment, and also satisfies both the requirements of a high piezoelectric constant and a high mechanical quality factor. The piezoelectric material comprises a plurality of crystal grains containing Ba, Ca, Ti, Zr, Mn, and O. An average equivalent circle diameter of the crystal grains is not smaller than 1.0 μm and not larger than 10 μm. The crystal grains include crystal grains A each having a first domain with a width of not smaller than 300 nm and not larger than 800 nm, and crystal grains B each having a second domain with a width of not smaller than 20 nm and not larger than 50 nm.
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公开(公告)号：US11201279B2
公开(公告)日：2021-12-14
申请号：US16051605
申请日：2018-08-01
IPC分类号： H01L41/18 , H01L41/09 , H01L41/047 , C04B35/468 , H01L41/187 , H01L41/083 , B32B18/00 , C04B35/634 , C04B35/626 , H01L41/43 , H02N2/10 , H02N2/16 , H04N5/225 , G02B7/10
摘要： A piezoelectric material which is low in load on the environment, and also satisfies both the requirements of a high piezoelectric constant and a high mechanical quality factor. The piezoelectric material comprises a plurality of crystal grains containing Ba, Ca, Ti, Zr, Mn, and O. An average equivalent circle diameter of the crystal grains is not smaller than 1.0 μm and not larger than 10 μm. The crystal grains include crystal grains A each having a first domain with a width of not smaller than 300 nm and not larger than 800 nm, and crystal grains B each having a second domain with a width of not smaller than 20 nm and not larger than 50 nm.
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公开(公告)号：US20180233655A1
公开(公告)日：2018-08-16
申请号：US15895376
申请日：2018-02-13
发明人： Hiroshi Saito , Akira Uebayashi , Tomohiro Watanabe , Yuto Niinuma , Yasushi Shimizu , Toshihiko Akatsuka
IPC分类号： H01L41/187 , H01L41/43 , H01L41/297 , H01L41/04 , H02N2/00
CPC分类号： H01L41/1871 , H01L41/04 , H01L41/083 , H01L41/257 , H01L41/297 , H01L41/43 , H02N2/001 , H02N2/163
摘要： A piezoelectric material includes a metal oxide containing at least Ba, Ca, Ti, Zr, and Mn, in which the piezoelectric material has a perovskite structure, in which: x, which represents a ratio of a content (mol) of Ca to A (mol) representing a total content of Ba and Ca, falls within a range of 0.10x0.18; y, which represents a ratio of a content (mol) of Zr to B (mol) representing a total content of Ti, Zr, and Mn, falls within a range of 0.055≤y≤0.085; and z, which represents a ratio of a content (mol) of Mn to the B (mol), falls within a range of 0.003≤z≤0.012, and in which the piezoelectric material satisfies a relationship of 0≤(|d31(31 20u)−d31(−20d)|)/|d31(−20u)|≤0.08, and has a value of 130 pm/V or more for each of |d31(−20u)| and |d31(−20d)|.
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4.发明申请公开(公告)号：US20190140558A1
公开(公告)日：2019-05-09
申请号：US16174898
申请日：2018-10-30
IPC分类号： H02N2/00 , H02N2/16 , H01L41/187 , H01L41/113 , H01L41/047
摘要： A vibration wave motor includes a driven body, a vibrator including an annular vibration plate and an annular piezoelectric element, and a vibration damping member, which are arranged in sequence, wherein the vibration plate has, on a side facing the driven body, radially extending groove portions at X places, and, when center depths of the groove portions at X places are sequentially denoted by D1 to DX in a circumferential direction, D1 to DX vary along a curve obtained by superposing one or more sine waves, and wherein the vibration plate is locally supported by the vibration damping member in some or all antinode portions of a standing wave occurring when the vibration wave motor is driven.
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公开(公告)号：US11469689B2
公开(公告)日：2022-10-11
申请号：US16429859
申请日：2019-06-03
摘要： A vibration wave motor includes an annular oscillator, and an annular moving member provided so as to be in press contact with the oscillator. The oscillator includes an annular vibrating plate, and an annular piezoelectric element provided on a first surface of the vibrating plate. The vibrating plate is in contact with the moving member via a second surface of the vibrating plate, which is opposite the first surface. The piezoelectric element has a plurality of drive phase electrodes. When a driving region represents a region of the oscillator in which the drive phase electrodes are provided, and a non-driving region represents a remaining region of the oscillator, a contact area ratio S1 between the vibrating plate and the moving member in the non-driving region is less than a contact area ratio S2 between the vibrating plate and the moving member in the driving region.
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公开(公告)号：US11258376B2
公开(公告)日：2022-02-22
申请号：US16174898
申请日：2018-10-30
IPC分类号： H02N2/00 , H01L41/04 , H01L41/047 , H01L41/187 , H01L41/113 , H02N2/16 , H04N5/225 , G02B7/08 , G02B7/02
摘要： A vibration wave motor includes a driven body, a vibrator including an annular vibration plate and an annular piezoelectric element, and a vibration damping member, which are arranged in sequence, wherein the vibration plate has, on a side facing the driven body, radially extending groove portions at X places, and, when center depths of the groove portions at X places are sequentially denoted by D1 to DX in a circumferential direction, D1 to DX vary along a curve obtained by superposing one or more sine waves, and wherein the vibration plate is locally supported by the vibration damping member in some or all antinode portions of a standing wave occurring when the vibration wave motor is driven.
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