Abstract: In one embodiment, a printing system includes an inkjet printhead configured to traverse bi directionally over a printzone printing one swath in a first direction, and a subsequent swath in a second direction opposite the first direction, with the printhead rising to a base temperature in response to a pre warming signal prior to beginning a swath. The printing system also includes a temperature sensor configured to monitor the temperature of the printhead. A controller is configured to generate the pre warming signal in response to an end of swath temperature monitored by the temperature sensor following printing the one swath.

Abstract: A printhead for an inkjet printer having geometric features which reduce drop placement error of main and satellite drops ejected from the nozzles of the printhead. Nozzles that are tilted along an axis corresponding to the direction of scanning of the printhead while printing have reduced drop placement error in the orthogonal direction to the scanning, and create a breakoff velocity for the satellite drop that can cause the main and satellite drops to be placed in a coincident location on the medium in one of the directions of scanning, thus forming desireable round printed spots and reducing drop placement error in the scan direction. These improvements can be repeatably achieved for all nozzles. Nozzles with non-circular and asymmetric bores also reduce drop placement errors, particularly when these types of nozzles are also tilted.

Abstract: The illustrated invention defines an analytical chip comprising an optically transparent substrate such as glass or silicon that defines a fluid inlet port and at least one fluid carrying channel communicating with the inlet. At least one reaction chamber fluidly communicates with the channel and an air management chamber is in fluid communication with the reaction chamber to facilitate capillary flow of fluid into the reaction chamber.

Abstract: Volume of fluid feed channels is adjusted for drop generators that are staggered with respect to a feed edge. In one embodiment, barrier islands are positioned, sized, and/or shaped to adjust the volume. In another embodiment, protrusions or walls thereof are positioned to adjust the volume.

Abstract: A fluid ejection device has a firing chamber with a feature disposed therewithin.

Abstract: A drop emitting device that includes a plurality of nozzle openings and a plurality of grooves in the vicinity of the nozzle openings.

Abstract: A fluid ejection device has a firing chamber with a feature disposed therewithin.

Abstract: An ink jet printhead that includes a plurality of nozzles formed in a nozzle plate. A plurality of grooves are formed in the nozzel plate in the vicinity of the nozzles.

Abstract: Volume of fluid feed channels is adjusted for drop generators that are staggered with respect to a feed edge. In one embodiment, barrier islands are positioned, sized, and/or shaped to adjust the volume. In another embodiment, protrusions or walls thereof are positioned to adjust the volume.

Abstract: A fluid drop ejecting apparatus including a thin film stack including a plurality of heater resistors formed on a substrate having a feed edge, a patterned fluid barrier layer disposed on the thin film stack, respective fluid chambers formed in the barrier layer over respective heater resistors, fluid feed features formed in the barrier layer between the fluid feed edge and the ink chambers, and a thin film metal structure in a metal layer of the thin film stack and located between the ink feed edge and the fluid chambers.

Abstract: An ink jet printhead that includes a thin film substructure having heater resistors formed therein, an ink barrier layer disposed on the thin film substructure, a plurality of ink chambers formed in said ink barrier, a plurality of ink channels respectively connected to the ink chambers and opening towards an ink feed edge, and a plurality of barrier island located in respective ink channels. Each barrier island has a size that depends on the distance between an associated heater resistor and the ink feed edge.

Abstract: An inkjet printhead includes multiple printing elements grouped in sets about an ink refill channel. Each printing element includes a nozzle chamber and firing resistor. Respective nozzle chambers are located at a staggered distance away from the ink refill channel. A printing element's feed channel couples its nozzle chamber to the ink refill channel. A pinch point defined by barrier walls occurs along the feed channel. Converging and diverging half angles for each barrier wall of a given printing element are the same. Such angles differ among a plurality of printing elements. The specific angle for a given printing element defines where along the feed channel the pinch point occurs. The specific angle is prescribed according to the distance from a given printing element's firing resistor to the ink refill channel. A certain angle is used for a certain resistor stagger position to provide ink refill balancing among printing elements.