Data bandwidth reduction to printhead with redundant nozzles
AssigneeHewlett-Packard Company
InventorDaryl E. Anderson
Life of this patent
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Abstract
A printhead includes a first nozzle column register and logic units configured to receive first serial nozzle data and to provide first nozzle firing control signals for controlling the firing of ink drops from a first column of nozzles. Second nozzle column register and logic units are configured to receive the first serial nozzle data and to provide second nozzle firing control signals for controlling the firing of ink drops from a second column of nozzles. First column redundancy logic is configured to disable selected nozzles of the first column of nozzles from firing. Second column redundancy logic is configured to disable selected nozzles of the second column of nozzles from firing.
Claims20
A printhead comprising:
- a first column of nozzles;
- first nozzle column register and logic units configured to receive first serial nozzle data and to provide first nozzle firing control signals for controlling the firing of ink drops from the first column of nozzles;
- a second column of nozzles;
- second nozzle column register and logic units configured to receive the first serial nozzle data and to provide second nozzle firing control signals for controlling the firing of ink drops from the second column of nozzles;
- first column redundancy logic configured to disable selected nozzles of the first column of nozzles from firing which correspond to selected nozzles of the second column of nozzles enabled for firing;
- and
- second column redundancy logic configured to disable selected nozzles of the second column of nozzles from firing which correspond to selected nozzles of the first column of nozzles enabled for firing.
A printhead assembly comprising:
- at least one printhead, each printhead including:
- a first column of nozzles;
- first nozzle column register and logic units configured to receive first serial nozzle data and to provide first nozzle firing control signals for controlling the firing of ink drops from the first column of nozzles;
- a second column of nozzles;
- second nozzle column register and logic units configured to receive the first serial nozzle data and to provide second nozzle firing control signals for controlling the firing of ink drops from the second column of nozzles;
- first column redundancy logic configured to disable selected nozzles of the first column of nozzles from firing which correspond to selected nozzles of the second column of nozzles enabled for firing;
- and
- second column redundancy logic configured to disable selected nozzles of the second column of nozzles from firing which correspond to selected nozzles of the first column of nozzles enabled for firing.
A method of operating a printhead comprising:
- receiving first serial nozzle data with first nozzle column register and logic units;
- providing first nozzle firing control signals with first nozzle column register and logic units for controlling the firing of ink drops from a first column of nozzles;
- receiving the first serial nozzle data with second nozzle column register and logic units;
- providing second nozzle firing control signals with second nozzle column register and logic units for controlling the firing of ink drops from a second column of nozzles;
- disabling selected nozzles of the first column of nozzles from firing which correspond to selected nozzles of the second column of nozzles enabled for firing;
- and
- disabling selected nozzles of the second column of nozzles from firing which correspond to selected nozzles of the first column of nozzles enabled for firing.
Dependencies are inferred from the claim text.