Abstract: An object of the present invention is to provide a stacked piezoelectric element with excellent reliability and durability, a production method thereof and an electrically conducting adhesive. A stacked piezoelectric element comprising a ceramic stack obtained by alternately stacking a piezoelectric layer comprising a piezoelectric material and an internal electrode layer having electrical conductivity, and an electrically conducting adhesive layer provided to allow for electrical conduction to said internal electrode layer of the same polarity on the side surface of said ceramic stack, wherein said electrically conducting adhesive layer comprises a base resin having dispersed therein an electrically conducting filler and microparticles, and the boundary between said microparticle and said base resin is in a state that a void is formed at least in a part between those two members or in a state that when said base resin is elongated, a void can be formed between those two members.

Abstract: A method of manufacturing a lamination-type piezoelectric element includes forming a ceramic laminated body in which ceramic layers and inner electrode layers are alternately laminated on each other. A pair of outer electrodes are respectively joined to a pair of joining faces formed on an outer circumferential face of the ceramic laminated body. A belt-shaped outer circumferential groove portion coming into contact with an outer circumferential end portion of at least some part of the inner electrode layers is formed on the outer circumferential face of the ceramic laminated body. This outer circumferential groove portion has at least one dent portion protruding from the adjoining portion. The outer circumferential groove portion has at least one of an insulating portion made of insulating material and a conductive portion made of conductive material.

Abstract: A method for producing thin sheet-like ceramic plates comprising the steps of: forming a green sheet from a ceramic raw material; arranging a separation material comprising a burning loss material capable of being burnt and lost by baking, in a punch-out area for punching out sheet pieces on a surface of the green sheet; punching out the punch-out area from the green sheet to obtain the sheet pieces; stacking the punched out sheet pieces to form an intermediate stacked body; baking the intermediate stacked body to obtain a baked stacked body comprising ceramic layers stacked one upon another; and separating the ceramic layers from the baked stacked body to obtain discrete ceramic sheets, and thin sheet-like ceramic plates produced using this production method.

Abstract: A stacked-type piezoelectric device comprising a ceramic stacked body constituted by alternately stacking ceramic layers and internal electrode layers one upon another, and a pair of external electrodes bonded respectively to a pair of bond surfaces formed on an outer peripheral surface of the ceramic stacked body, in which the ceramic stacked body has, at least partially in a peripheral direction, a groove portion recessed in a groove shape from its outer peripheral surface in such a fashion as to be adjacent to a stacking surface of each internal electrode layer, and a production method thereof.

Abstract: The invention provides a laminate-type piezoelectric element comprising a ceramic laminate 10 with ceramic layers 11 and internal electrode layers 12 respectively stacked alternately, and a pair of external electrodes respectively connecting with a pair of connecting areas 15 formed at an outer peripheral area of the ceramic laminate 10. The internal electrode layer comprises an internal electrode part 120 with electric conductivity, and a non-pole part 120 where the internal electrode part 120 does not exist at the inside near an outer peripheral area. The ceramic laminate 10 comprises stress relaxation parts 13 able to modify more easily their shapes than the ceramic layers 11, along at least a part of said internal electrode layers. This stress relaxation part 13 is placed so as to overlap with the non-pole part 129 of either of the internal electrode layers 12, in a stacking direction of the ceramic laminate 10.

Abstract: This invention is directed to providing a method for producing a stacked piezoelectric element, where grooves can be easily formed on the side face of a stacked body without causing damage.

Abstract: A lamination-type piezoelectric element (1) comprises: a ceramic laminated body (10) in which ceramic layers and inner electrode layers (12) are alternately laminated on each other; and a pair of outer electrodes (18) respectively joined to a pair of joining faces (15) formed on an outer circumferential face of the ceramic laminated body (10). A belt-shaped outer circumferential groove portion (120) coming into contact with an outer circumferential end portion (127) of at least some part of the inner electrode layers (12) is formed on the outer circumferential face of the ceramic laminated body (10). This outer circumferential groove portion (120) has at least one dent portion (121) protruding from the adjoining portion. The outer circumferential groove portion (120) has at least one of an insulating portion (181) made of insulating material and a conductive portion (183) made of conductive material.

Abstract: A method for producing a ceramic laminate includes a sheet-forming process for forming a green sheet 11 by placing a raw ceramic material on a carrier film 12, a punching process for punching a green sheet piece of a predetermined shape from the green sheet, a stacking process for sequentially stacking a plurality of the green sheet pieces to form a green laminate, and a calcination process for calcining the green laminate to obtain a ceramic laminate consisting of a plurality of ceramic layers, wherein, in the punching process, the green sheet piece only is punched while the green sheet 11 is held on the carrier film 12.