Overhanging Nozzles Vertical Alignment Thermal Inkjet Printheads
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Solution Overview
Problem
Existing inkjet printheads require complex horizontal channels and bridging structures for fluid communication between the primary via and nozzle chambers, leading to issues like insufficient heat capacity and inadvertent ink ejection due to thermal dynamics.
Innovation Solution
The design features nozzle chambers that vertically overlie the primary via within a substrate, eliminating the need for horizontal channels and using heaters mounted directly on the substrate, with tapered walls and chamfered edges to meter fluid flow and improve thermal energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If horizontal channels are used to provide fluid communication between primary via and nozzle chambers, then fluid communication is achieved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The patent removes the horizontal channel structure entirely by positioning nozzle chambers to directly overlie the primary via, extracting the intermediate fluid transport component that added complexity while maintaining essential fluid communication functionality
Solution Approach 2:
The patent transitions from a horizontal fluid transport path to a vertical arrangement where nozzle chambers are positioned directly above the primary via, utilizing the vertical dimension to eliminate the need for horizontal channels and simplify the overall structure
2Temperature
If heater bridges are used to deliver thermal energy, then thermal energy transfer is achieved, but heat capacity is insufficient and fabrication complexity increases
Solution Approach 1:
The patent eliminates the heater bridge structure by mounting heaters directly to the substrate, removing the intermediate thermal transport component that limited heat capacity while increasing fabrication complexity
Solution Approach 2:
The patent merges the heater mounting function directly with the substrate, combining what were previously separate components (heater bridge and substrate) into a direct attachment configuration that improves thermal energy transfer
3Ease of manufacture
If heaters are offset from primary ink via, then fabrication is simplified, but thermal energy transfer efficiency decreases
Solution Approach 1:
The patent utilizes vertical positioning to place heaters directly beneath nozzle chambers that overlie the primary via, transitioning from horizontal offset placement to vertical alignment that enhances thermal energy transfer efficiency
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 design simplifies fabrication, enhances thermal energy transfer, and reduces the risk of overheating, resulting in more efficient ink ejection and refill characteristics without the complexity of bridging structures.
Implementation Method 1
Thermal inkjet printers utilize fluid actuators that comprise electrical resistors (referred to hereinafter as 'heaters') that are 'fired' by passing an electrical current through each heater in order to generate thermal energy
Implementation Method 2
The thermal energy generated upon firing of a heater is relatively local and sufficient to vaporize a small fraction of ink in thermal communication with the heater, preferably to vaporize ink within the nozzle chamber
Implementation Method 3
The pressure differential and expansion of fluid to a gaseous state within the nozzle chamber forces the remaining liquid ink within the chamber through the nozzle orifice and onto the print medium
Data Source
AI summary
A fluid ejector, such as a printhead for an inkjet printer, comprising a substrate that includes a primary via formed therein, and a nozzle member overlying the substrate and including vertical nozzle chambers at least partially overlying the primary via and a corresponding fluid actuator (e.g., a heater) associated with the substrate.