公开(公告)号：EP4112313A1

公开(公告)日：2023-01-04

申请号：EP21781988.7

申请日：2021-03-26

申请人： Kyocera Corporation

发明人： TABATA, Shuhei ,  HIGASHIBEPPU, Makoto ,  HIRAYAMA, Takeshi ,  SHIMURA, Gen ,  HASEGAWA, Yukihiro

IPC分类号： B41J2/14

摘要： A piezoelectric actuator includes a first active region and a second active region. The first active region is made of a piezoelectric member polarized in a thickness direction and overlaps a midsection of a pressure chamber when viewed in plan through a pressure applying surface. The second active region is made of a piezoelectric member polarized in the thickness direction and closer than the first active region to the pressure applying surface. The second active region extends over both a peripheral section of the pressure chamber and an outer region located outside the pressure chamber when viewed in plan through the pressure applying surface. When performing liquid ejection control, a driver controls intensity of a first electric field applied to the first active region and intensity of a second electric field applied to the second active region such that the time period over which the first active region expands and the time period over which the second active region expands overlap or coincide with each other and the time period over which the first active region contracts and the time period over which the second active region contracts overlap or coincide with each other. The first electric field is more intense than the second electric field.

公开(公告)号：EP4063124A1

公开(公告)日：2022-09-28

申请号：EP20905876.7

申请日：2020-12-25

申请人： Kyocera Corporation

发明人： TABATA, Shuhei ,  HIGASHIBEPPU, Makoto ,  HIRAYAMA, Takeshi ,  HASEGAWA, Yukihiro ,  SHIMURA, Gen ,  MIYAHARA, Takashi ,  ISHIHARA, Atsushi

IPC分类号： B41J2/14

摘要： A piezoelectric actuator includes a common electrode that is provided on a piezoelectric layer at a side adjacent to a first surface and extends over a plurality of piezoelectric elements. A plurality of first individual electrodes are provided on the piezoelectric layer at a side adjacent to a second surface. The plurality of first individual electrodes are positioned individually at the plurality of piezoelectric elements, and are not electrically connected to each other. A first insulating layer is provided on the common electrode at a side adjacent to the first surface and extends over the plurality of piezoelectric elements. A plurality of second individual electrodes are provided on the first insulating layer at a side adjacent to the first surface. The plurality of second individual electrodes are positioned individually at the plurality of piezoelectric elements, and overlap centers of the plurality of first individual electrodes in see-through plan view. The plurality of second individual electrodes are electrically connected to each other.

公开(公告)号：EP3923356A1

公开(公告)日：2021-12-15

申请号：EP20771137.5

申请日：2020-03-02

申请人： Kyocera Corporation

发明人： HIRAYAMA, Takeshi ,  TABATA, Shuhei ,  SHIMURA, Gen

IPC分类号： H01L41/187 ,  B41J2/14 ,  C04B35/495

摘要： A piezoelectric ceramic composition is represented by a composition formula A x BO 3 and includes potassium sodium niobate containing K and Na that account for 80% or more of an amount of A-site elements and containing Nb that accounts for 70% or more of an amount of B-site elements. The piezoelectric ceramic composition contains Ta and Fe at a B-site.

公开(公告)号：EP4101827A1

公开(公告)日：2022-12-14

申请号：EP21781621.4

申请日：2021-03-26

申请人： Kyocera Corporation

发明人： HIRAYAMA, Takeshi ,  TABATA, Shuhei ,  HIGASHIBEPPU, Makoto ,  SHIMURA, Gen ,  HASEGAWA, Yukihiro

IPC分类号： C04B35/495 ,  C01G33/00 ,  H01L41/09 ,  H01L41/187

摘要： Provided is a piezoelectric ceramic composition including a potassium sodium niobate-based perovskite type complex oxide represented by Compositional Formula ABO 3 , as a main component. Further, the piezoelectric ceramic composition contains Bi in an A site and Zr in a B site. Further, the piezoelectric ceramic composition includes a segregation portion positioned in a crystal grain. At least one of Zr or Bi is localized in the segregation portion.

公开(公告)号：EP4063125A1

公开(公告)日：2022-09-28

申请号：EP20905878.3

申请日：2020-12-25

申请人： Kyocera Corporation

发明人： TABATA, Shuhei ,  HIGASHIBEPPU, Makoto ,  HIRAYAMA, Takeshi ,  SHIMURA, Gen ,  HASEGAWA, Yukihiro

IPC分类号： B41J2/14

摘要： A piezoelectric actuator includes a piezoelectric layer and a conductor layer that is provided directly or indirectly on the piezoelectric layer. In plan view, the conductor layer includes a plurality of individual electrodes that are arranged with intervals therebetween and a plurality of wiring lines that extend from the plurality of individual electrodes. Each wiring line includes a wide portion and a first narrow portion. The wide portion includes a part positioned at a center of the wiring line in a length direction. The first narrow portion is disposed between the wide portion and one of the plurality of individual electrodes to which the wiring line is connected. The first narrow portion has a width less than a width of the wide portion.

公开(公告)号：EP3923355A1

公开(公告)日：2021-12-15

申请号：EP20770364.6

申请日：2020-03-02

申请人： Kyocera Corporation

发明人： TABATA, Shuhei ,  HIRAYAMA, Takeshi ,  SHIMURA, Gen

IPC分类号： H01L41/09 ,  H01L41/187 ,  B41J2/14 ,  C04B35/495

摘要： In a piezoelectric ceramic composition including potassium sodium niobate, a transition temperature at which a phase transition between an orthorhombic crystal structure and a tetragonal crystal structure occurs lies in a temperature range of -20°C or higher and 60°C or lower. In the piezoelectric ceramic composition, αt/αo is 0.72 or more, where αo represents a coefficient of linear expansion determined when a crystal structure is orthorhombic in the temperature range, and αt represents a coefficient of linear expansion determined when a crystal structure is tetragonal in the temperature range.