摘要:
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 (21a and 21b) 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 (21a and 21b), 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 (21a and 21b) 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 W0, the width of the first external electrode layer (31) is taken to be W1, and the width of the second external electrode layer (32) is taken to be W2, a relationship exists in which W1>W2 and 2.5≦(W2/W0)×100≦60, and the laminated piezoelectric element (1) has a piezoelectric active section (1a) 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 (1a).
摘要:
A laminated-type piezoelectric element 1 is provided, which comprises a first external electrode layer 33, which is located at a side area of the laminated-type piezoelectric element 1, is electrically continuous to internal electrode layers 21, and comprises plural expansible and contractible opening portions 33a in a stacking direction of the laminated-type piezoelectric element 1. As the first external electrode layer 33 is connected to the laminated-type piezoelectric element 1 with an electrically conductive adhesive member 32 and the electrically conductive adhesive member 32 is narrower than the first external electrode layer 33, the electrically conductive adhesive member 32 penetrates into the opening portions 33a of the first external electrode layer 33 to form connections in a shape of an anchor. Therefore, the first external electrode layer 33 is firmly connected to the laminated-type piezoelectric element 1.
摘要:
A laminated-type piezoelectric element 1 is provided, which comprises a first external electrode layer 33, which is located at a side area of the laminated-type piezoelectric element 1, is electrically continuous to internal electrode layers 21, and comprises plural expansible and contractible opening portions 33a in a stacking direction of the laminated-type piezoelectric element 1. As the first external electrode layer 33 is connected to the laminated-type piezoelectric element 1 with an electrically conductive adhesive member 32 and the electrically conductive adhesive member 32 is narrower than the first external electrode layer 33, the electrically conductive adhesive member 32 penetrates into the opening portions 33a of the first external electrode layer 33 to form connections in a shape of an anchor. Therefore, the first external electrode layer 33 is firmly connected to the laminated-type piezoelectric element 1.
摘要:
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 (21a and 21b) 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 (21a and 21b), 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 (21a and 21b) via the first ecternal electrode layer wherein there are specific external electrode width relationships.
摘要:
A laminated piezoelectric element according to the present invention includes a plurality of unit laminates and a plurality of adhesive layers. The unit laminates are stacked together. Each of the unit laminates includes a plurality of piezoelectric ceramic layers and a plurality of internal electrode layers that are alternately laminated with the piezoelectric ceramic layers in the lamination direction of the unit laminate. Each of the adhesive layers is formed between adjacent two of the unit laminates to bond the two unit laminates together. Further, each of the adhesive layers has a thickness of 1 μm or less and an adhesive strength of 1.3 MPa or higher.
摘要:
A multilayer piezoelectric element has a pair of outer electrodes and a multilayer ceramic body composed of piezoelectric layers and inner electrode layers which are alternately stacked. The outer electrodes are formed on a pair of electrode connecting surfaces in the outer circumference surfaces of the multilayer ceramic body. Each outer electrode electrically connected to the inner electrode layers through connecting material is composed of a fixed part, a free part having plural expandable-openings, and a rigid part. The fixed part is electrically contacted with the connection material. A sectional area of the rigid part is rather than that of each of the fixed part and the free part in a width direction of the outer electrode. Each outer electrode has at least one part where the fixed part, the free part and the rigid part are arranged in order in the width direction.
摘要:
A multilayer piezoelectric element has a pair of outer electrodes and a multilayer ceramic body composed of piezoelectric layers and inner electrode layers which are alternately stacked. The outer electrodes are formed on a pair of electrode connecting surfaces in the outer circumference surfaces of the multilayer ceramic body. Each outer electrode electrically connected to the inner electrode layers through connecting material is composed of a fixed part, a free part having plural expandable-openings, and a rigid part. The fixed part is electrically contacted with the connection material. A sectional area of the rigid part is rather than that of each of the fixed part and the free part in a width direction of the outer electrode. Each outer electrode has at least one part where the fixed part, the free part and the rigid part are arranged in order in the width direction.
摘要:
A laminated piezoelectric element according to the present invention includes a plurality of unit laminates and a plurality of adhesive layers. The unit laminates are stacked together. Each of the unit laminates includes a plurality of piezoelectric ceramic layers and a plurality of internal electrode layers that are alternately laminated with the piezoelectric ceramic layers in the lamination direction of the unit laminate. Each of the adhesive layers is formed between adjacent two of the unit laminates to bond the two unit laminates together. Further, each of the adhesive layers has a thickness of 1 μm or less and an adhesive strength of 1.3 MPa or higher.
摘要:
In a fuel injection device, a pressure control valve is configured to make communication between an outflow port and a return channel and to interrupt the communication so as to control pressure of a fuel in a pressure control chamber, a valve member is configured to open and close a valve portion in response to the pressure of the fuel in the pressure control chamber, and a pressing member is arranged to be reciprocated and displaced in the pressure control chamber. The pressing member has an outer wall surface portion that is opposite to an inner wall surface portion of the control body to be capable of contacting the inner wall surface portion of the control body, and at least one of the outer wall surface portion of the pressing member and the inner wall surface portion of the control body is provided with a recess portion that is recessed to a side separated from the other one of the outer wall surface portion of the pressing member and the inner wall surface portion of the control body.
摘要:
In a fuel injection device, a control body has a pressure control chamber, an inflow port and an outflow port. The inflow port and the outflow port are opened at an abutting surface exposed to the pressure control chamber. In the pressure control chamber is arranged a floating plate for pressing the abutting surface by a pressing surface with the pressure of the fuel to interrupt communication between the inflow port and the pressure control chamber. The abutting surface of the control body is provided with an outer opposite surface portion opposite to an outer edge of the pressing surface in a displacement axis direction of the floating plate, and the outer opposite surface portion has a special depressed portion that is depressed in the displacement axis direction and that extends along the shape of the outer edge of the pressing surface.