Nozzle condition evaluation
AssigneeHewlett-Packard Development Company, L.P.
InventorsDaryl E. Anderson, Eric T. Martin
Life of this patent
Estimating the term…
Abstract
In some examples, a print head includes a plurality of nozzles, a test result register to store a drive bubble detect (DBD) test result for a first nozzle of the plurality of nozzles, and a result-ready register to store a status indication set to a predetermined value provided responsive to storing of the DBD test result in the test result register, where the test result register and the result-ready register are accessible by a control unit outside the print head to evaluate a nozzle condition based on the DBD test result in the test result register.
Claims19
A print head comprising:
- a plurality of nozzles;
- a test result register to store a drive bubble detect (DBD) test result for a first nozzle of the plurality of nozzles;
- and
- a result-ready register to store a status indication set to a predetermined value responsive to storing of the DBD test result in the test result register, wherein the test result register and the result-ready register are accessible by a control unit outside the print head to evaluate a nozzle condition based on the DBD test result in the test result register.
A fluid ejection device comprising:
- a plurality of nozzles;
- a test result register to store drive bubble detect (DBD) test results performed for the plurality of nozzles;
- a nozzle identifying register to indicate nozzles from among the plurality of nozzles for which the DBD test results are being stored in the test result register;
- and
- a DBD module communicatively coupled to the plurality of nozzles, wherein the DBD module is to:
- determine a first nozzle, from among the plurality of nozzles, having a first DBD test result indicating failure;
- store the first DBD test result for the first nozzle in the test result register for being used by a control unit for evaluating a nozzle condition of the first nozzle based on the first DBD test result;
- and
- update the nozzle identifying register to identify the first nozzle for which the first DBD test result is being stored in the test result register.
A print head comprising
- a plurality of nozzles;
- a test result register;
- a result-ready register;
- and
- a drive bubble detect (DBD) module communicatively coupled to the plurality of nozzles, wherein the DBD module is to:
- store DBD test results performed for a set of nozzles from among the plurality of nozzles in the test result register;
- set a status indication of the result-ready register to a predetermined value responsive to storage of the DBD test results in the test result register;
- and
- output the DBD test results from the test result register to a control unit to evaluate a nozzle condition of the set of nozzles.
Dependencies are inferred from the claim text.