A liquid ejection head is manufactured by forming on a substrate an energy generating element for ejecting a liquid, an integrated circuit for driving the energy generating element, a supply port for the liquid so as to penetrate through the substrate, an electrode for generating a liquid flow, and a flow path forming member having an ejection orifice for ejecting the liquid such that a flow path for the liquid is formed between the substrate and the flow path forming member. The electrode is formed over high and low of a stepped shape formed on the substrate in at least one step selected from the steps of forming the energy generating element, forming the integrated circuit and forming the supply port.

A liquid discharge head includes first and second actuators and a drive circuit. Each of the first and second actuators is configured to expand and contract first and second pressure chambers, respectively. The drive circuit is configured to, during a dot formation cycle apply a first number of discharge pulses to the first actuator to cause the first number of droplets to be discharged from the first pressure chamber and apply a second number of discharge pulses to the second actuator to cause the second number of droplets to be discharged from the second pressure chamber and apply a third number of precursors to the second actuator. The first number is greater than or equal to two. Each of the second and third numbers is greater than or equal to one. A sum of the second and third numbers is less than or equal to the first number.

The present application is in at least one aspect directed to solving a problem of providing an inkjet recording device and an inkjet head driving method, in which instantaneous power consumption of a plurality of drive waveform generation circuits can be reduced while not requiring correction of an ink landing position without a complex structure. The problem is solved by dividing a plurality of pressure generating elements into first to n-th sets (n is an integer of 2 or more), and applying drive pulses to the pressure generating elements in the respective sets per every pixel period. The drive pulse combines any one of n time sharing drive waveforms (time sharing drive 1, 2, 3) with a common drive waveform (COM) as a rendering waveform, and the n time sharing drive waves are obtained by delaying a part of the rendering waveform by a time different from each other and have application timing deviated from each other.

In accordance with an embodiment, a liquid discharge head comprises an actuator and a controller. The actuator drives a pressure chamber, which is filled with liquid and communicates with a nozzle in which a meniscus of the liquid is formed. The controller applies an acceleration pulse for accelerating vibration of the meniscus to the actuator after applying a discharge pulse for discharging the liquid in the pressure chamber from the nozzle.

A method for depositing droplets onto a medium, utilising a droplet deposition head is provided. The head used in the method includes: an array of fluid chambers separated by interspersed walls, each fluid chamber communicating with an aperture for the release of fluid droplets and each wall separating two neighbouring chambers. Each wall is actuable such that, in response to a first voltage, it will deform so as to decrease the volume of one chamber and increase the volume of the other chamber, and, in response to a second voltage, it will deform so as to cause the opposite effect on the volumes of its neighbouring chambers. The method includes the steps of: receiving input data; assigning, based on such input data, all the chambers within the array as either firing chambers or non-firing chambers, so as to produce bands of one or more contiguous firing chambers separated by bands of one or more contiguous non-firing chambers; actuating the walls of certain of the chambers such that: for each non-firing chamber, either one wall is stationary while the other is moved, or the walls move with the same sense, or they remain stationary; and, for each firing chamber the walls move with opposing senses; such actuations result in each firing chamber releasing at least one droplet, the resulting droplets forming bodies of fluid disposed on a line on the medium, such bodies of fluid being separated on the line by respective gaps for each of the bands of non-firing chambers, the size of each such gap generally corresponding in size to the respective band of non-firing chambers. The actuations of the walls of said firing chambers in the actuating step are such that, if only one of the two walls of each firing chamber were actuated in such manner, no droplets would be ejected from that firing chamber. A droplet deposition apparatus, a droplet deposition head and a computer program product are also provided.

An inkjet head comprises a pressure chamber that stores liquid; an actuator that changes a volume of the pressure chamber in response to an applied driving signal; and an applying section that applies the driving signal to the actuator. The driving signal includes a discharge pulse and an oscillation pulse. The discharge pulse enables liquid to be discharged from a nozzle communicating with the pressure chamber. The oscillation pulse is applied before the discharge pulse and has a potential opposite in polarity to that of the discharge pulse to generate pressure oscillation for promoting discharge of the liquid in the liquid. When the driving signal includes two or more successive discharge pulses, a cycle of the discharge pulse is 1.5 times or more and 2.5 times or less as long as a half cycle of a main acoustic resonance frequency of the liquid in the pressure chamber.

A liquid jet head includes a plurality of nozzles adapted to jet liquid, a piezoelectric actuator having a plurality of pressure chambers communicated individually with the nozzles and each filled with the liquid, and adapted to change a capacity of each of the pressure chambers, and a control section adapted to apply at least one pulse signal to the piezoelectric actuator to thereby expand and contract the capacity of the pressure chambers to jet the liquid filling the pressure chamber. The pressure chambers adjacent to each other of the plurality of the pressure chambers are set so as to belong to a plurality of groups different from each other. The control section makes the pulse signals different in timing between the plurality of groups and sets a shift amount of the timing in the pulse signals between the respective groups.

A liquid discharge head includes first and second actuators and a drive circuit. Each of the first and second actuators is configured to expand and contract first and second pressure chambers, respectively. The drive circuit is configured to, during a dot formation cycle apply a first number of discharge pulses to the first actuator to cause the first number of droplets to be discharged from the first pressure chamber and apply a second number of discharge pulses to the second actuator to cause the second number of droplets to be discharged from the second pressure chamber and apply a third number of precursors to the second actuator. The first number is greater than or equal to two. Each of the second and third numbers is greater than or equal to one. A sum of the second and third numbers is less than or equal to the first number.

A liquid discharge head includes an actuator and a drive circuit. The actuator is configured to expand and contract a pressure chamber corresponding thereto. The drive circuit is configured to, during a dot formation cycle apply a first discharge pulse to the actuator to cause a first droplet to be discharged from the pressure chamber, and after a predetermined rest period, during which no discharge pulse is applied to the actuator, has elapsed from application of the first discharge pulse, apply a second discharge pulse to the actuator to cause a second droplet to be discharged from the pressure chamber.

According to one embodiment, a liquid ejection head includes a substrate with an opening through which a first liquid can pass. An actuator is on a first side of the substrate and has a plurality of pressure chambers. A manifold is on a second side of the substrate. The manifold forms a first flow path for a second fluid. The liquid ejection head has first electrode with portions formed on an upper surface of the actuator, a surface on the first side of the substrate, an inner wall of the opening, and a surface on the second side of the substrate in a region outside the first flow path.