Abstract: A luminaire and retaining device that retains LEDs in a housing of the luminaire through the use of a mechanical interface with the housing. The retaining device has a shape that engages the housing through a ratcheting feature, and allows the LEDs and retaining device to be removably installed in such a way that manufacturing time is reduced. This provides for easy of replacement or servicing of the LEDs.

Abstract: A method of supplying liquid ink to a printhead assembly including a carrier, a printhead die mounted on the carrier, and a fluid delivery assembly communicated with the carrier includes communicating a fluid manifold of the carrier with the printhead die, communicating the fluid delivery assembly with the fluid manifold of the carrier, and filling the fluid delivery assembly with a quantity of the liquid ink, including purging air from the fluid delivery assembly through a filter, wherein the filter includes a frame having an opening and a fluid passage communicated with the opening formed therein, filter material enclosing the opening and the fluid passage of the frame, first and second fluid ports communicated with the fluid passage, and a permeable material communicated with the first fluid port.

Abstract: In one embodiment, an ink pen includes an ink chamber, a passage and a printhead operatively connected to the ink chamber through the passage such that ink flowing from the ink chamber to the printhead passes through the passage. The passage includes an upstream part having a polygonal cross sectional area and a downstream part having a cross sectional area smaller than the polygonal cross sectional area.

Abstract: A check valve includes two opposing sheets surfaces that are coupled together to form a flow channel there between. The flow channel has a first end, a second end and at least one curved portion in between the first and second ends. A first opening is provided at the first end of the flow channel and a second opening is provided at the second end of the flow channel.

Abstract: One embodiment of a leak detection structure includes a sensor having a leak detection surface and a wicking structure positioned adjacent the leak detection surface, the wicking structure adapted for wicking a fluid onto the leak detection surface.

Abstract: A filter for a printhead assembly includes a frame having an opening and a fluid passage communicated with the opening formed therein, filter material enclosing the opening and the fluid passage of the frame, a first fluid port communicated with the fluid passage of the frame, a permeable material communicated with the first fluid port, and a second fluid port spaced from the first fluid port and communicated with the fluid passage of the frame.