Hewlett-packard Development Company, L.P.

Shane O'Brien

Boon Bing Ng

Ning Ge

Patrick Leonard

Hang Ru Goy

Mun Hooi Yaow

Hang-Ru Goy

A fluid ejection device including a printhead die having a plurality of layers, including a single metal layer, and having an integrated ink level sensor. The ink level sensor includes an ink chamber above the metal layer, a metal plate of a sense capacitor disposed in the metal layer, and a clearing resistor circuit disposed in the metal layer including four clearing resistors arranged in a surround-4 configuration about the metal plate and electrically connected in parallel between a voltage potential and ground, wherein adjacent ends of at least two clearing resistors are not directly connected to one another so as to leave a gap between the adjacent ends in the metal layer. A metal lead in the metal layer extends through the gap to the metal plate.

Fluid ejection device with printhead ink level sensor

An example provides a fluid ejection apparatus including a first firing resistor and a second firing resistor to selectively cause fluid to be ejected through a single nozzle, and a parasitic resistor arranged to add a parasitic resistance to the first firing resistor.

Fluid ejection apparatus including a parasitic resistor

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Leixlip, Ireland

Shane O'Brien