Abstract: According to one embodiment, a liquid ejection head, includes a piezoelectric member having grooves extending lengthwise in a first direction. The grooves separate the piezoelectric member into piezoelectric elements spaced from each other in a second direction. A connection portion of the piezoelectric member is under a portion of the grooves in a third direction and connects the piezoelectric elements to each other. Individual electrodes are on a first surface of the piezoelectric member on a first side. A common electrode is on a second surface of the piezoelectric member on a second side. Each groove has a depth on the first side that is deeper than a depth in an end portion on the second side. The depth of each groove in the end portion on the first side reaches through the piezoelectric member to a substrate.

Abstract: A liquid ejecting head includes a piezoelectric member formed of a piezoelectric material. The piezoelectric member has grooves extending lengthwise in a first direction. The grooves separate portions of the piezoelectric member into a plurality of piezoelectric elements spaced from each other in a second direction. A connection portion of the piezoelectric member is under at least a portion of the grooves in a third direction. The connection portion connects the piezoelectric elements to each other. Individual electrodes are on first lateral surfaces of the piezoelectric elements on a first side of the piezoelectric member. A common (shared) electrode is on second lateral surfaces of the piezoelectric elements on a second side of the piezoelectric member. Each groove has a depth in an end portion of the groove on the first side that is deeper than a depth in an end portion of the groove on the second side.

Abstract: According to one or more embodiments, a liquid ejection head includes an actuator and a driver. The actuator has a piezoelectric element made of a lead-free piezoelectric material. The driver applies a voltage to the actuator to vibrate the piezoelectric element in a first direction with a first electric field in a first polarization direction of the piezoelectric element and a second electric field in a direction opposite to the first polarization direction. The second electric field is controlled to be equal to or less than a coercive electric field of the piezoelectric element.

Abstract: According to an embodiment, a liquid dispensing head includes a nozzle plate with a plurality of nozzles and a plurality of pressure chambers respectively communicating with the nozzles. A vibration plate is on a side of the pressure chambers opposite the nozzle plate. A supply-side flow path for liquid to be dispensed from the nozzle is on an inlet side of the plurality of pressure chambers. A discharge-side flow path for the liquid is on an outlet side of the pressure chambers. Piezoelectric elements are positioned to vibrate the vibration plate to change a volume of the pressure chambers for ejecting (dispensing) the liquid from the plurality of nozzles. The supply-side flow path is set to have a flow path resistance that is the same as a flow path resistance of the discharge-side flow-path.

Abstract: According to one embodiment, a liquid ejecting head includes a piezoelectric member, electrodes, and a wiring substrate. The piezoelectric member has a plurality of piezoelectric elements formed of a piezoelectric material. The electrodes are formed on the piezoelectric member. The wiring substrate is joined to the electrodes by solder. The solder has a melting point of less than or equal to ½ of the Curie point of the piezoelectric material.

Abstract: A liquid ejecting head of a side shooter type includes a plate including a plurality of nozzles arranged along a first direction and an actuator with a plurality of pressure chambers arranged along the first direction. Each pressure chamber communicates with a corresponding one of the nozzles. The actuator further includes dummy chambers, each of which is between two otherwise adjacent pressure chambers. Common chambers are provided in the actuator. The pressure and dummy chambers are arranged between the common chambers. The end portions of the pressure chambers are connected to a common chamber. The width of the end portions of each of the pressure chambers is less than the width of a portion of the pressure chamber between the end portions.

Abstract: According to one embodiment, a liquid discharge head includes a flexible printed circuit (FPC) connected to piezoelectric elements. The FPC has a first end in the first direction. A wiring layer of the FPC has a first region at the first end and a cover layer covering on a second region. The piezoelectric elements are spaced from each other in a second direction and each has a first electrode on a side surface facing towards the FPC. The first side has a joint surface facing the first region of the wiring layer. The first electrode is electrically connected to the wiring layer at the joint surface. The side surface includes a step portion that is recessed from the joint surface. A portion of the cover layer protrudes into a space adjacent to the step portion.

Abstract: A liquid ejection head for ejecting a liquid, includes a base plate extending along a first direction, an actuator unit on the plate and including first piezoelectric elements and one or more support elements arranged along the first direction, a flow path member on the actuator unit and including: pressure chambers each for storing the liquid and having volumes that can be changed by a corresponding one of the first piezoelectric elements, and one or more first openings at positions corresponding to the support elements, and a nozzle plate on the flow path member and including: nozzles through which the liquid in the corresponding pressure chambers are ejected in response to a change in the volume of the corresponding pressure chambers, and one or more second openings connected respectively to the first openings and through which the support elements corresponding to the first openings are visible.

Abstract: A liquid ejection head of a side shooter type includes a plate including nozzles arranged along a first direction and through which liquid is ejected, an actuator including pressure chambers communicating with the nozzles, dummy chambers each disposed between two adjacent pressure chambers, and sidewalls separating the chambers along the first direction and deformable to change a volume of each pressure chamber according to a signal, and covers having apertures and partly covering both ends of each pressure chamber in a second direction intersecting the first direction such that the pressure chambers communicate with a common chamber at both ends thereof through the apertures. Each cover includes a first portion on and between the sidewalls and a second portion other than the first portion, and a first length of the first portion is equal to or greater than a second length of the second portion in the second direction.

Abstract: According to one embodiment, a liquid ejection head includes an actuator with a plurality of pressure chambers and dummy chambers. The pressure chambers are each part of a groove that is disposed between an adjacent pair of sidewalls. Each pressure chamber is in fluid communication with a nozzle for ejecting a liquid. The dummy chambers are each between an adjacent pair of pressure chambers. A common chamber is fluidly connected to an end of each of the pressure chambers. A throttle portion is at the end portion of each pressure chamber. Each throttle portion blocks a part of a liquid flow path from the first common chamber to the pressure chamber. The first throttle portion is formed of a resin material.

Abstract: A liquid ejecting head of a side shooter type includes a plate including a plurality of nozzles arranged along a first direction and an actuator with a plurality of pressure chambers arranged along the first direction. Each pressure chamber communicates with a corresponding one of the nozzles. The actuator further includes dummy chambers, each of which is between two otherwise adjacent pressure chambers. Common chambers are provided in the actuator. The pressure and dummy chambers are arranged between the common chambers. The end portions of the pressure chambers are connected to a common chamber. The width of the end portions of each of the pressure chambers is less than the width of a portion of the pressure chamber between the end portions.

Abstract: According to one embodiment, a liquid discharge head includes a flexible printed circuit (FPC) connected to piezoelectric elements. The FPC has a first end in the first direction. A wiring layer of the FPC has a first region at the first end and a cover layer covering on a second region. The piezoelectric elements are spaced from each other in a second direction and each has a first electrode on a side surface facing towards the FPC. The first side has a joint surface facing the first region of the wiring layer. The first electrode is electrically connected to the wiring layer at the joint surface. The side surface includes a step portion that is recessed from the joint surface. A portion of the cover layer protrudes into a space adjacent to the step portion.

Abstract: According to one embodiment, a liquid ejection head includes an actuator and a diaphragm. The actuator has plate-shaped piezoelectric members stacked one on the other in a stacking direction. The plate-shaped piezoelectric members each comprise a lead-free piezoelectric material. The diaphragm is adjacent to the actuator. The diaphragm is configured to vibrate in its thickness direction based on vibrations of the plate-shaped piezoelectric members in the stacking direction.

Abstract: According to one or more embodiments, a liquid ejection head includes an actuator and a driver. The actuator has a piezoelectric element made of a lead-free piezoelectric material. The driver applies a voltage to the actuator to vibrate the piezoelectric element in a first direction with a first electric field in a first polarization direction of the piezoelectric element and a second electric field in a direction opposite to the first polarization direction. The second electric field is controlled to be equal to or less than a coercive electric field of the piezoelectric element.

Abstract: A liquid discharge head includes an actuator base, a case member, and a nozzle plate. The actuator base includes a plurality of grooves space from each other in a first direction. Each of the grooves extends in a second direction. The actuator base is formed of a piezoelectric ceramic material. The case member includes a frame portion spaced from the actuator base in the second direction. The frame portion has an end surface in the third direction that is level with an end surface of the actuator base in the third direction. The frame portion is formed of a ceramic material having aluminum titanate as a main component. The nozzle plate is contacting the end surface of the frame portion and the end surface of the actuator base.

Abstract: A fluid discharge head according to an embodiment includes abase including a plurality of first grooves disposed side by side in a first direction and a plurality of second grooves disposed side by side in the first direction and respectively disposed among the plurality of first grooves, an individual wire including individual electrodes formed in the second grooves, the individual wire being extended to one side in a second direction crossing the first direction, a common wire including common electrodes formed in the first grooves, the common wire being extended to the other side in the second direction, a connection wire connected to the common wire on the other side in the second direction and leading to the one side, and a nozzle plate including nozzles that communicate with the first grooves of the base.

Abstract: A liquid discharge head includes an actuator base, a case member, and a nozzle plate. The actuator base includes a plurality of grooves space from each other in a first direction. Each of the grooves extends in a second direction. The actuator base is formed of a piezoelectric ceramic material. The case member includes a frame portion spaced from the actuator base in the second direction. The frame portion has an end surface in the third direction that is level with an end surface of the actuator base in the third direction. The frame portion is formed of a ceramic material having aluminum titanate as a main component. The nozzle plate is contacting the end surface of the frame portion and the end surface of the actuator base.

Abstract: A fluid discharge head according to an embodiment includes abase including a plurality of first grooves disposed side by side in a first direction and a plurality of second grooves disposed side by side in the first direction and respectively disposed among the plurality of first grooves, an individual wire including individual electrodes formed in the second grooves, the individual wire being extended to one side in a second direction crossing the first direction, a common wire including common electrodes formed in the first grooves, the common wire being extended to the other side in the second direction, a connection wire connected to the common wire on the other side in the second direction and leading to the one side, and a nozzle plate including nozzles that communicate with the first grooves of the base.

Abstract: An inkjet head comprises a drive section, a nozzle plate, a substrate and a wiring section. The drive section comprises two integral piezoelectric members of which polarization directions are opposite with respect to the longitudinal direction of the piezoelectric member, wherein a plurality of grooves arranged from one piezoelectric member to the middle of the other piezoelectric member and a plurality of holes arranged across the two piezoelectric members are alternately arranged along the longitudinal direction of the piezoelectric member. The nozzle plate is fixed on one main surface of the one piezoelectric member and comprises a plurality of nozzle holes facing the plurality of the grooves. The substrate is fixed with the other main surface of the other piezoelectric member. The wiring section is arranged on an inner surface of the hole and at a position facing the hole of the substrate.

Abstract: An inkjet head comprises a drive section, a nozzle plate, a substrate and a wiring section. The drive section comprises two integral piezoelectric members of which polarization directions are opposite with respect to the longitudinal direction of the piezoelectric member, wherein a plurality of grooves arranged from one piezoelectric member to the middle of the other piezoelectric member and a plurality of holes arranged across the two piezoelectric members are alternately arranged along the longitudinal direction of the piezoelectric member. The nozzle plate is fixed on one main surface of the one piezoelectric member and comprises a plurality of nozzle holes facing the plurality of the grooves. The substrate is fixed with the other main surface of the other piezoelectric member. The wiring section is arranged on an inner surface of the hole and at a position facing the hole of the substrate.