Inkjet Printhead IC with Movable Nozzle Plate for Dead Nozzle Compensation
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Solution Overview
Problem
Pagewidth inkjet printheads face challenges in achieving high print quality and efficiency due to redundant nozzle rows for dead nozzle compensation, increased cost, and complexity, as well as limitations in controlling drop placement and dot resolution, while also experiencing issues with electrical efficiency and ground bounce.
Innovation Solution
The development of an inkjet nozzle assembly with moveable paddles actuated by thermal bend actuators, allowing independent control of droplet ejection direction and enabling efficient drop placement and high dot density printing without redundant nozzle rows, along with improved MEMS/CMOS integration to minimize ground bounce.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant nozzle rows are added for dead nozzle compensation, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies dynamics by making the nozzle plate movable relative to the substrate through thermal bend actuators. This dynamic adjustment allows the nozzle plate to shift position to compensate for dead nozzles, eliminating the need for redundant nozzle rows while maintaining reliability. The movable nozzle plate can be actuated to realign functional nozzles with the print media, providing flexible compensation without adding structural redundancy.
2Reliability
If more nozzle rows are added for dead nozzle compensation, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The movable nozzle plate design allows a single row of nozzles to dynamically compensate for dead nozzles through thermal actuation, eliminating the need to manufacture additional redundant nozzle rows. This reduces manufacturing complexity and cost while maintaining the ability to compensate for nozzle failures through controlled movement of the nozzle plate.
3Device complexity
If fixed nozzle structure is used, then device complexity is reduced, but adaptability for drop placement control is limited
Solution Approach 1:
The patent transforms the fixed nozzle structure into a dynamic system where the nozzle plate can move relative to the substrate through thermal bend actuators. This enables precise control over drop placement by adjusting the nozzle plate position, while maintaining relatively simple individual nozzle components. The adaptability is achieved through the collective movement of the nozzle plate rather than complex individual nozzle structures.
4Reliability
If redundant nozzle rows are included, then reliability is improved, but productivity is reduced due to additional complexity
Solution Approach 1:
The movable nozzle plate provides a single-row configuration that can dynamically compensate for dead nozzles, eliminating the need for redundant nozzle rows. This reduces the total number of nozzles that need to be managed and actuated simultaneously, thereby improving printing speed and productivity while maintaining reliability through active compensation rather than passive redundancy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances print quality and efficiency by allowing precise control over droplet placement, reducing the need for redundant nozzles, and improving electrical efficiency, resulting in higher dot densities and faster printing speeds while maintaining low costs and complexity.
Implementation Method 1
when a current is passed through the thermoelastic beam, the thermoelastic beam expands relative to the passive beam, resulting in bending of a respective paddle towards the floor of the nozzle chamber
Data Source
AI summary
An inkjet printhead integrated circuit (IC) includes: a substrate having a drive circuitry layer; a plurality of nozzle assemblies disposed on an upper surface of the substrate and arranged in one or more nozzle rows extending longitudinally along the printhead IC; a nozzle plate extending across the printhead IC; and a conductive track fused to the nozzle plate which extends longitudinally along the printhead IC and parallel with the nozzle rows. The conductive track is connected to a common reference plane in the drive circuitry layer via a plurality of conductor posts extending between the drive circuitry layer and the conductive track.