In order to keep possible local temperature differences in a liquid ejection head small to allow stable liquid ejection performance to be achieved, temperatures in a plurality of heating areas in a liquid ejection head are discretely controlled using heating elements and temperature detection elements.

A coalescing agent for three-dimensional (3D) printing includes a co-solvent, a surfactant having a hydrophilic lipophilic balance (HLB) value that is less than 10, a carbon black pigment, a polymeric dispersant, and a balance of water. The cosolvent is present in an amount ranging from about 15 wt % to about 30 wt % of a total wt % of the coalescing agent. The surfactant is present in an amount ranging from about 0.5 wt % to about 1.4 wt % of the total wt % of the coalescing agent. The carbon black pigment is present in an amount ranging from about 3.0 wt % to about 6.0 wt % of the total wt % of the coalescing agent. The polymeric dispersant has a weight average molecular weight ranging from about 12,000 to about 20,000.

Provided is a liquid ejection head including: a plurality of recording element substrates including energy generating elements that generate ejection energy for ejecting liquid from ejection orifices; a first support member that supports the plurality of recording element substrates such that the recording element substrates are arranged in one or more lines on a main surface of the first support member; and a second support member that supports the first support member on a surface opposite to the main surface. A first thermal resistance concerning an in-plane direction parallel to the main surface, of a region between the recording element substrates in the first support member is higher than a second thermal resistance concerning a thickness direction of the second support member, of a projection region that overlaps with each recording element substrate in the second support member.

A fluid ejection device may include fluid ejectors, fluid pumps to circulate fluid to the fluid ejectors, a first actuation signal line and at least one second actuation signal line. The first actuation signal line is connected to each of the fluid ejectors and each of the fluid pumps along which a first signal is transmittable to actuate a selected one of fluid ejectors and the fluid pumps. The at least one second actuation signal line is connected to the fluid pumps along which a second signal is transmittable to actuate a selected one of the fluid pumps.

A printhead assembly includes ink ejection devices having nozzles and arranged into primitive groups, and processing electronics in communication with the ink ejection devices. The processing electronics including logic to receive data packets for controlling the ink ejection devices. Each data packet includes primitive firing data and fire signal selection data. The processing electronics also include logic to select, for each data packet, a fire signal for application to the primitive groups from among selectable fire signals switchable among the primitive groups based on the fire signal selection data in each respective packet. The processing electronics also include logic to generate the selected fire signals, and to apply the selected fire signals to the ink ejection devices based on the primitive firing data for each data packet.

A print head with a number of memristors and inverters is described. The print head includes a number of nozzles to deposit an amount of fluid onto a print medium. Each nozzle includes a firing chamber to hold the amount of fluid, an opening to dispense the amount of fluid onto the print medium, and an ejector to eject the amount of fluid through the opening. The print head also includes a number of memristor cells. Each memristor cell includes a memristor to store data, a voltage divider serially connected to the 116 memristor cell, and an inverter connected in parallel with the number of memristor cells and the voltage divider.

A driving pulse to be applied to a plurality of print elements in a print element array is decided based on the deviation of the discharge amount from the print elements.

A wide array printhead module includes a plurality of printhead die. Each of the printhead die includes a number of sensors to measure properties of a number of elements associated with the printhead die. The wide array printhead module further includes an application specific integrated circuit (ASIC) to command and control each of the printhead die. The ASIC is located off any of the printhead die.

A fluid ejection device includes a plurality of fluid actuation devices, a plurality of memory cells, and a configuration register. Each memory cell of the plurality of memory cells corresponds to a fluid actuation device of the plurality of fluid actuation devices. The configuration register stores data to enable or disable access to the plurality of memory cells.

Various embodiments disclose a method for operating a printer apparatus. The method comprising monitoring a utilization rate of each heating element in a first set of heating elements defined by a print head arrangement. Further, the method comprises generating a utilization dataset based upon monitoring of the utilization rate of each heating element in the first set of heating elements print head arrangement. Furthermore, the method includes analyzing the utilization dataset to identify one or more overutilized heating elements of the first set of heating elements. Additionally, the method includes identifying a second set of heating elements defined by the print head arrangement. The second set of heating elements comprises a portion of the first set of heating elements exclusive of the one or more overutilized heating elements. The method further includes processing a print job. The processed print job utilized the second set of heating elements during printing.