Abstract: An inkjet nozzle includes an aperture with a noncircular opening having a first segment substantially defined by a first polynomial equation and a second segment substantially defined by a second equation.

Abstract: An inkjet nozzle includes an aperture with a noncircular opening substantially defined by a polynomial equation. A droplet generator is also described which includes a firing chamber fluidically coupled to a fluid reservoir a heating resistor and a nozzle. The nozzle includes an aperture forming a passage from the firing chamber to the exterior of the droplet generator through a top hat layer. The nozzle is defined by a closed polynomial and has a mathematically smooth and mathematically continuous shape around aperture's perimeter wall, with two protrusions extending into the center of the aperture.

Abstract: In one example, a process for making a micro device assembly includes placing a micro device on a front part of a printed circuit board, molding a molding on the printed circuit board surrounding the micro device, and then forming a channel to the micro device in a back part of the printed circuit board.

Abstract: In some examples, a fluid nozzle includes an aperture comprising a first lobe that is shaped as an ellipse, and a second lobe that has a non-circular shape and has a different size than a size of the first lobe. The fluid nozzle further includes protrusions between the first and second lobes extending inward and forming a throat between the first and second lobes.

Abstract: In one example, a process for making a micro device assembly includes placing a micro device on a front part of a printed circuit board, molding a molding on the printed circuit board surrounding the micro device, and then forming a channel to the micro device in a back part of the printed circuit board.

Abstract: An Inkjet nozzle includes an aperture with a noncircular opening substantially defined by a polynomial equation. A droplet generator is also described which includes a firing chamber fluidically coupled to a fluid reservoir a heating resistor and a nozzle. The nozzle includes an aperture forming a passage from the firing chamber to the exterior of the droplet generator through a top hat layer. The nozzle is defined by a closed polynomial and has a mathematically smooth and mathematically continuous shape around aperture's perimeter wall, with two protrusions extending into the center of the aperture.

Abstract: In one example, a process for making a micro device assembly includes placing a micro device on a front part of a printed circuit board, molding a molding on the printed circuit board surrounding the micro device, and then forming a channel to the micro device in a back part of the printed circuit board.

Abstract: An inkjet nozzle includes an aperture with a noncircular opening substantially defined by a polynomial equation. A droplet generator is also described which includes a firing chamber fluidically coupled to a fluid reservoir, a heating resistor and a nozzle. The nozzle includes an aperture forming a passage from the firing chamber to the exterior of the droplet generator through a top hat layer. The nozzle is defined by a closed polynomial and has a mathematically smooth and mathematically continuous shape around aperture's perimeter wall, with two protrusions extending into the center of the aperture.

Abstract: An example microfluidic device comprises a substrate having a first surface and a cover layer above the first surface. The cover layer and the first surface form a microfluidic channel and a chamber. The example microfluidic device further comprises a functional port in the cover layer over the chamber and at least one developer port in the cover layer over the microfluidic channel. The developer port is above a portion of the microfluidic channel that is not proximate to the functional port.

Abstract: In some examples, a fluid nozzle includes an aperture comprising a first lobe that is shaped as an ellipse, and a second lobe that has a non-circular shape and has a different size than a size of the first lobe. The fluid nozzle further includes protrusions between the first and second lobes extending inward and forming a throat between the first and second lobes.

Abstract: In one example, a process for making a micro device assembly includes placing a micro device on a front part of a printed circuit board, molding a molding on the printed circuit board surrounding the micro device, and then forming a channel to the micro device in a back part of the printed circuit board.

Abstract: A method to control puddling on a fluid dispense head, comprising limiting the height of a puddle of fluid over a fluid dispensing nozzle while simultaneously limiting the spread of the puddle laterally away from the nozzle.

Abstract: Methods and apparatus are provided related to fluid dispensing heads. A dispense head is formed to define a plurality of fluid jetting nozzles and a surface pattern. The surface pattern is characterized by one or more voids extending inward from an outer surface of the dispense head. Fluid puddle formation during operation of the dispense head is limited in volume by way of the surface pattern. Fluid puddle limiting reduces or eliminates dispensing errors to an entity, undesirable artifacts from resulting on a printed media, or similar problems.

Abstract: A fluid ejection device includes a firing chamber having an ejection orifice opposite a chamber floor, a heating element and a mesa projecting from the chamber floor, the mesa is spaced from the heating element to define a passive zone between the mesa and heating element.

Abstract: Methods and apparatus are provided related to fluid dispensing heads. A dispense head is formed to define a plurality of fluid jetting nozzles and a surface pattern. The surface pattern is characterized by one or more voids extending inward from an outer surface of the dispense head. Fluid puddle formation during operation of the dispense head is limited in volume by way of the surface pattern. Fluid puddle limiting reduces or eliminates dispensing errors to an entity, undesirable artifacts from resulting on a printed media, or similar problems.

Abstract: A fluid ejection device includes a firing chamber having an ejection orifice opposite a chamber floor, a heating element and a mesa projecting from the chamber floor, the mesa is spaced from the heating element to define a passive zone between the mesa and heating element.

Abstract: An inkjet nozzle includes an aperture with a noncircular opening having a first segment substantially defined by a first polynomial equation and a second segment substantially defined by a second equation.

Abstract: An inkjet nozzle includes an aperture with a noncircular opening substantially defined by a polynomial equation. A droplet generator is also described which includes a firing chamber fluidically coupled to a fluid reservoir, a heating resistor and a nozzle. The nozzle includes an aperture forming a passage from the firing chamber to the exterior of the droplet generator through a top hat layer. The nozzle is defined by a closed polynomial and has a mathematically smooth and mathematically continuous shape around aperture's perimeter wall, with two protrusions extending into the center of the aperture.

Abstract: An inkjet printhead includes a substrate having an ink slot formed through its center. Integrated circuitry is formed on both a first side and a second side of the center ink slot. A conductor trace is routed across the ink slot to provide electrical communication between the integrated circuitry on the first and second sides of the slot.

Abstract: A method of manufacturing a fluid ejection device includes providing a barrier layer and an orifice layer on a substrate, laminating a layer of photo-resist over a substantially planar surface of the orifice layer, forming an orifice in the orifice layer, and forming a counterbore in the layer of photo-resist, with forming a counterbore in the layer of photo-resist including exposing a portion of the substantially planar surface of the orifice layer within the counterbore.