LIQUID INJECTION HEAD, LIQUID INJECTION DEVICE AND PIEZOELECTRIC ELEMENT

• Main Authors: NAWANO MASAHISA, YONEMURA TAKAYUKI, KONISHI AKIO
• Format: Patent
• Language: English; Japanese
• Published: 04.06.2015
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; CONCRETE; CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTRICITY; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; INORGANIC CHEMISTRY; LIME, MAGNESIA; LINING MACHINES; METALLURGY; PERFORMING OPERATIONS; PRINTING; REFRACTORIES; SELECTIVE PRINTING MECHANISMS; SLAG; STAMPS; TRANSPORTING; TREATMENT OF NATURAL STONE; TYPEWRITERS

PROBLEM TO BE SOLVED: To provide: a liquid injection head having a piezoelectric element improved in breakdown resistance against a DC voltage in regard to a piezoelectric material including bismuth and iron; a liquid injection device; and such a piezoelectric element.SOLUTION: A liquid injection head comprises: a pressure-generation chamber 12 communicating to a nozzle opening 21 for ejecting liquid; and a piezoelectric element 300 including a first electrode 60, a piezoelectric material layer 70 provided on the first electrode 60 and a second electrode 80 provided on the piezoelectric material layer 70. In the liquid injection head, the piezoelectric material layer 70 includes at least bismuth and iron by 50 mol% or more; the current-time curve of the piezoelectric material layer 70 obtained by applying a voltage across the first electrode 60 and the second electrode 80 has two or more polarity changing points. 【課題】ビスマス及び鉄を含む圧電材料において、直流電圧に対する破壊耐性が向上した圧電素子を具備する液体噴射ヘッド、液体噴射装置及び圧電素子を提供する。【解決手段】液体を吐出するノズル開口２１に連通する圧力発生室１２と、第１電極６０、第１電極６０上に設けられた圧電体層７０及び圧電体層７０上に設けられた第２電極８０を備えた圧電素子３００と、を具備する液体噴射ヘッドにおいて、圧電体層７０は、少なくともビスマス及び鉄を５０ｍｏｌ％以上含み、第１電極６０及び第２電極８０に電圧を印加して得られる圧電体層７０の電流−時間曲線は、２つ以上の変極点を有する。【選択図】図３