Fluid ejection device
AssigneeHewlett-Packard Development Company, L.P.
InventorsTrudy Benjamin, Kevin Bruce
Life of this patent
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Abstract
A fluid ejection device includes a plurality of firing cells, a clocked latch switch, and a data latch switch. Each firing cell includes a heater used to fire ink through a nozzle, a drive switch, and a memory cell used to store a control value used to control the drive switch. The memory cell includes a data switch. A clocked latch switch receives a data-in signal and latches the data-in signal. All of the firing cells in the plurality of firing cells use the data-in signal latched by the clocked latch switch. The data latch switch latches the data-in signal to the data switch of at least two, but not all of the firing cells in the plurality of firing cells.
Claims13
A fluid ejection device comprising:
- a plurality of firing cells, each firing cell including:
- a heater used to fire ink through a nozzle,
- a drive switch, connected to the heater, and
- a memory cell used to store a control value used to control the drive switch, the memory cell including a data switch;
- a clocked latch switch, the clocked latch switch receiving a data-in signal and latching the data-in signal, wherein all of the firing cells in the plurality of firing cells use the data-in signal latched by the clocked latch switch;
- and,
- a data latch switch, the data latch switch simultaneously latching the data-in signal to the data switch of at least two of the firing cells in the plurality of firing cells, but not latching the data-in signal to all of the firing cells in the plurality of firing cells.
A method for providing a control value to a plurality of firing cells of a fluid ejection device, comprising:
- receiving and latching a data-in signal by a clocked latch switch, wherein all of the firing cells in the plurality of firing cells receive the data-in signal latched by the clocked latch switch;
- simultaneously latching the data-in signal into memory cells within at least two of the firing cells in the plurality of firing cells, but not latching the data-in signal into all of the firing cells in the plurality of firing cells;
- and,
- using the data-in signal latched to the memory cells to control firing ink from a nozzle in the fluid ejection device.
A fluid ejection device comprising:
- a plurality of firing means for firing ink through a nozzle, each of the plurality of firing means including:
- storing means for storing a control value used to determine in which firing cycle ink is fired through nozzles;
- first latch means for receiving a data-in signal and latching the data-in signal, wherein all of the firing means in the plurality of firing means use the data-in signal latched by the first latch means;
- and,
- second latch means for simultaneously latching the data-in signal to the storing means within at least two of the firing cells in the plurality of firing means, but not latching the data-in signal to the storing means within all of the firing means in the plurality of firing means.
Dependencies are inferred from the claim text.