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CN1877878A 层叠压电元件 失效 - 放弃专利权

层叠压电元件
摘要：
一种层叠压电元件(1)，包括：层叠压电元件(1)，其包括由能够在施加电压时膨胀和收缩的陶瓷构成的压电层(11)，和向压电层提供电压的内部电极层(21a和21b)，交替地设置内部电极层和压电层；第一外部电极层(31)，将其设置在层叠压电元件(1)的一侧上，并使其与内部电极层(21a和21b)电连接；以及第二外部电极层(32)，将其设置在层叠压电元件(1)的一侧上，并通过第一外部电极层(31)使其与内部电极层(21a和21b)电连接；其中，当将在垂直于层叠方向的方向上的层叠压电元件(1)的最大宽度取为W0，将第一外部电极层(31)的宽度取为W1，并且将第二外部电极层(32)的宽度取为W2时，存在其中W1＞W2且2.5≤(W2/W0)×100≤60的关系，并且，层叠压电元件(1)具有当施加电压时膨胀和收缩的压电活性部分(1a)，并在压电活性部分(1a)中在压电层(11)的层叠方向上连续地设置第二外部电极层(32)。
摘要（英）：

A laminated piezoelectric element ( 1 ) comprises a laminated piezoelectric element ( 1 ) piezoelectric layers ( 11 ) composed of a ceramic capable of expanding and contracting upon application of a voltage, and internal electrode layers ( 21 a and 21 b) that supply voltage to the piezoelectric layers, the internal electrode layers and piezoelectric layers being alternately provided, a first external electrode layer ( 31 ) provided on a side of the laminated piezoelectric element ( 1 ) and electrically connected with the internal electrode layers ( 21 a and 21 b), and a second external electrode layer ( 32 ) provided on a side of the laminated piezoelectric element ( 1 ) and electrically connected with the internal electrode layers ( 21 a and 21 b) via the first external electrode layer ( 31 ); wherein, when the maximum width of the laminated piezoelectric element ( 1 ) in the direction perpendicular to the direction of lamination is taken to be W 0, the width of the first external electrode layer ( 31 ) is taken to be W 1, and the width of the second external electrode layer ( 32 ) is taken to be W 2, a relationship exists in which W 1 >W 2 and 2.5<=(W 2/ W 0 )x100<=60, and the laminated piezoelectric element ( 1 ) has a piezoelectric active section ( 1 a) that expands and contracts when a voltage is applied, and the second external electrode layer ( 32 ) is provided continuously in the direction of lamination of the piezoelectric layers ( 11 ) in the piezoelectric active section ( 1 a).

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