Active compensation for changes in the direction of drop ejection in an inkjet printhead
October 25, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3877036 Stitching method and apparatus for multiple nozzle ink jet printers Electrostatic ink-jet printer Thermal ink jet printhead Ink jet recording method and apparatus for recovering ejection at a particular orifice by ejecting ink from adjacent orifices Movable ink jet priming station Ink jet printhead for continuous tone and text printing Ink jet print head rail assembly Ink jet recording head Continuous ink jet printer with micromechanical actuator drop deflection InventorsApplicationNo. 696536 filed on 10/25/2000US Classes:347/20Ejector mechanism (i.e., print head)ExaminersPrimary: Nguyen, HoangAssistant: Feggins, K. Attorney, Agent or FirmInternational ClassB41J 002/015AbstractFor an inkjet printhead (10) with integral compensation for misdirection of ink drops (37) ejected through at least one nozzle (24) of the printhead (10), a system and method of modifying the nozzle cavity space (32a) so as to compensate for the effects of defects in the printhead (10) by altering the direction the ejected ink drops (37). The inkjet printhead (10) comprises at least one reservoir (28) integrated within the membrane (30). The inkjet printhead (10) also comprises a channel (38) extending from the reservoir (28) and terminating in the nozzle cavity (32). A hardening substance (40) within the reservoir (28) and channel (38) is a plastic material having a high thermal expansion coefficient. An internal heater (48) within the reservoir (28) and adjacent the hardening substance (40) is adapted to cause the plastic material (40) to flow in order to form a protrusion (44) of plastic material (40) within the nozzle cavity space (32a). Alternatively, the plastic material (40) can be recessed within the channel (38). Thus, the hardening substance (40) is adapted to internally alter the nozzle cavity space (32a) and cause ink (34) ejected from the nozzle opening (26) to be deflected with regard to a desired amount of compensation.Field of SearchEjector mechanism (i.e., print head)Responsive to condition Creating plural tones Measuring and testing (e.g., diagnostics) Nozzles Resistor specifics Flow path Continuous stream (includes dispersion) With individual drop generation and/or control Drop generation means Drop charge means Drop deflection means Drop correction With stream deflection Medium and processing means | |
