摘要:
A cell driving type piezoelectric/electrostrictive actuator comprises: one or a plurality of cells defined by a wall portion including side walls, a ceiling wall and a bottom wall: side walls, the ceiling wall and the bottom wall being connected to form a space as cell, at least two side walls facing each other comprising piezoelectric/electrostrictive operation portions, the piezoelectric/electrostrictive operation portions being displaced to change a volume of the cell, wherein at least one pore is disposed in the wall portion other than at least two side walls facing each other and comprising piezoelectric/electrostrictive operation portions, and wherein all inner surfaces of the wall portion defining each cell are coated with one or more layers of seamless thin films. The method for preparing the same is also disclosed.
摘要:
There is disclosed a piezoelectric/electrostrictive device being less-particle-generative and capable of continuously realizing a stable displacement operation over a long period of time or being large in displacement amount and high in generative force and the like. This less-dust-generative piezoelectric/electrostrictive device 1 comprises a plurality of piezoelectric/electrostrictive elements 31 including a plurality of piezoelectric/electrostrictive members 4 and at least one pair of electrodes formed on the side surface of each piezoelectric/electrostrictive member 4, and the members are set up on a thick ceramic substrate 2. In this less-dust-generative matrix-type piezoelectric/electrostrictive device 1, a plurality of piezoelectric/electrostrictive elements 31 substantially having pillar shapes are set up in a matrix form. The ceramic substrate 2 is formed integrally with the piezoelectric/electrostrictive elements 31. The side surface of each piezoelectric/electrostrictive member 4 on which the electrodes 18, 19 are formed are formed as a fired, but unprocessed face.
摘要:
A laminated piezoelectric element is applicable as a driving source of opening and closing mechanism of an injection nozzle in a fuel injecting device. A laminated piezoelectric/electrostrictive element 1 has: a columnar laminate 10 constituted by alternately laminating a plurality of piezoelectric/electrostrictive layers 18 and inner electrode layers 18, 19; and outer electrodes connected to the inner electrode layers 18, 19 every other layer. This laminated piezoelectric/electrostrictive element 1 has stepped portions A formed periodically at every laminating cycle T in a side surface of the columnar laminate 10 of the element, the side surface being parallel to an axial direction (S-direction) of the columnar laminate 10. Due to the constitution mentioned above, the electrode is not easily worn even during an expanding and contracting operation during practical use, and the element can sufficiently circulate and cool a lubricant through the casing even during practical use.
摘要:
An actuator device has a drive section including a plurality of actuators arranged in a plane on a substrate, and a single first plate member to which drive forces from the actuators of the drive section are transmitted. A plurality of spacers are disposed between the first plate member and the substrate, forming m cells. Each of the actuators has a cavity, a vibrating section and a fixed section formed on the substrate. The rigidity of the first plate member is greater than the rigidity of the vibrating section of the actuator.
摘要:
A piezoelectric/electrostrictive device includes a pair of mutually opposing thin plate sections, a movable section, and a fixing section for supporting the thin plate sections and the movable section. Piezoelectric/electrostrictive elements are arranged on at least one thin plate section of the pair of thin plate sections. A hole is formed by both inner walls of the pair of thin plate sections, an inner wall of the movable section, and an inner wall of the fixing section. The piezoelectric/electrostrictive device further includes at least one beam section extending from the inner wall of the movable section to the inner wall of the fixing section.
摘要:
An automatic frequency control (AFC) system adapted to compensate for an insufficient capture range is described herein. The AFC system may be implemented in a mobile station for use with a wireless communications system such as code division multiple access (CDMA). The AFC system determines if a transmission frequency is within a capture range. The AFC system modifies a reference frequency generated by the mobile station if the transmission frequency is not within the capture range.
摘要:
A method of fabricating a piezoelectric/electrostrictive device including a driving portion, a movable portion, and a fixing portion for holding the driving portion and the movable portion. The driving portion includes a pair of thin plate portions facing each other, and a film-like piezoelectric/electrostrictive element formed on at least a part of the outer surface of at least one of the thin plate portions. A ceramic green laminate including at least one ceramic green sheet constituting one of the thin plates and at least one ceramic green sheet having at least one hole formed thereon is formed. The ceramic green laminate is sintered to produce a ceramic laminate. A piezoelectric/electrostrictive element is formed by a film formation method on the outer surface of the thin plate portion of the ceramic laminate. The ceramic laminate is then cut with the piezoelectric/electrostrictive element formed thereon.
摘要:
A piezoelectric/electrostrictive device is provided, including a pair of mutually opposing thin plate sections and a fixation section for supporting the thin plate sections. A piezoelectric/electrostrictive element is arranged on each of the thin plate sections. The piezoelectric/electrostrictive device also includes movable sections defined by at least first end portions of the thin plate sections and a material which is different from that of the thin plate section
摘要:
A piezoelectric actuator 1 capable of being driven with a high electric field intensity, obtaining a larger displacement and being high in electric conducting reliability of electrodes, and comprising: at least one cell 3 defined by two side walls 6, a substrate 2 and a ceiling wall 7; the two side walls being disposed on the substrate and being covered with the ceiling wall to define one cell, at least the two side walls 6 comprising piezoelectric/electrostrictive devices 4, and the piezoelectric/electrostrictive devices 4 being capable of changing a volume of the cell 3 by displacement of the walls. Each of the piezoelectric/electrostrictive devices 4 comprises a plurality of layered piezoelectric/electrostrictive bodies 14 and electrodes 18, 19 which are alternately stacked, and end portions of the electrodes 18, 19 are embedded in the piezoelectric/electrostrictive bodies 14 in at least the internal side of the cell 3.
摘要:
A matrix type piezoelectric/electrostrictive device in which a plurality of piezoelectric/electrostrictive elements almost in a pillar shape, each having a piezoelectric/electrostrictive substance and at least a pair of electrodes being formed on the sides of the substance, are vertically provided on a thick ceramic substrate. It is driven by displacement of the piezoelectric/electrostrictive substance. In this device, a plurality of piezoelectric/electrostrictive elements are integrally bonded to the ceramic substrate and independently arranged in two dimensions. The percentage of transgranularly fractured crystal grains on at least the sides of the piezoelectric/electrostrictive substance on which the electrodes are formed is 10% or less. The unit forms a curved surface near a joined section between the substance and the substrate. The present device can show excellent performances such as large displacement at a low voltage with pushing, distorting, moving, striking (impacting), or mixing an object of action and the like.