Inkjet Printhead Overlapping Vaporization Chambers
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Solution Overview
Problem
Current inkjet printheads face limitations in reducing their horizontal dimension due to the arrangement of vaporization chambers, which restricts the overall size and increases production costs, and the thin-film structure is not robust enough.
Innovation Solution
The design overlaps vaporization chambers from different rows along the longitudinal direction of the ink feed slot, allowing for a narrower and more robust printhead structure with optimized ink feeding through ducts having a rectangular cross-section, enabling higher ejection frequency and a thicker bridge structure for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vaporization chambers are arranged in separate rows along opposite sides of the ink feed slot, then each row can be independently fed with ink, but the overall horizontal dimension of the printhead increases
Solution Approach 1:
The patent merges the connection portions of vaporization chambers from opposite rows by overlapping them along the longitudinal direction of the ink feed slot. This allows chambers from both rows to share common connection portions and ducts, reducing the horizontal dimension while maintaining independent ink feeding capability through the shared connection structure.
Solution Approach 2:
The patent transitions from a side-by-side arrangement of connection portions (horizontal dimension) to an overlapping arrangement along the longitudinal direction. By utilizing the longitudinal dimension for overlap rather than horizontal separation, the printhead achieves compact horizontal dimensions while preserving functional independence through the overlapping connection design.
2Length of stationary object
If the bridge structure is made thin to reduce horizontal dimension, then the printhead size decreases, but the structure becomes less robust
Solution Approach 1:
The patent merges connection portions from multiple rows into overlapping regions, which allows the bridge structure to be thicker in the overlapping areas without increasing the overall horizontal dimension. The thicker bridge provides enhanced structural robustness and reliability while maintaining compact printhead size through the overlapping configuration.
3Ease of manufacture
If ducts have circular cross-section, then manufacturing is simpler, but ink feeding efficiency and ejection frequency are lower
Solution Approach 1:
The patent changes the geometric parameter of the duct cross-section from circular to rectangular. The rectangular cross-section with optimized dimensions provides superior ink feeding efficiency and higher ejection frequency compared to circular ducts, while the manufacturing process remains compatible with standard fabrication techniques for creating rectangular channels in the bridge structure.
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 approach reduces the overall horizontal dimension of the printhead, enabling more printheads on a single silicon wafer, lowers production costs, and results in a more robust and efficient ink feeding system with higher ejection frequency.
Implementation Method 1
Localised heat transfer from the resistor to a defined volume of ink within the vaporization chamber vaporizes said volume of ink and causes it to expand thereby causing a droplet of ink to be ejected
Implementation Method 2
Localised heat transfer from the resistor to a defined volume of ink within the vaporization chamber
Data Source
AI summary
An inkjet printhead comprising a substrate having an ink feed slot formed in the substrate and having a first longitudinal edge and a second longitudinal edge opposite to the first longitudinal edge, the first longitudinal edge extending along a first longitudinal axis (X); a first row of vaporization chambers arranged along the first longitudinal edge and a second row of vaporization chambers arranged along the second longitudinal edge, in which each chamber comprises an ink droplet generating portion and a connection portion, the connection portion including at least one duct in fluid connection with the ink feed slot, wherein the connection portions of the chambers of the first row overlap along the first longitudinal axis (X) with the connection portions of the chambers of the second row.