Segmented Printhead Die for Voltage Stability
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Solution Overview
Problem
Inkjet printheads with long feed slots experience significant electrical voltage drops due to long electrical traces, leading to inconsistent drop sizes and potential nozzle failure, which degrades print quality.
Innovation Solution
The printhead die is designed with segmented feed slots and staggered slot segments to minimize the width and length of electrical traces, ensuring consistent voltage delivery to all nozzles, and the use of diagonal pathways for power and signal traces reduces trace length and parasitic resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the printhead width is increased to cover larger print areas, then the printing productivity is improved, but the electrical trace length increases causing voltage drops and nozzle reliability degradation
Solution Approach 1:
The feed slot is divided into multiple segmented sections rather than being a single continuous slot. This segmentation allows electrical traces to be routed more efficiently by accessing different feed slot sections at different positions along the printhead, reducing the overall trace length and minimizing voltage drops across wide printheads while maintaining the ability to cover large print areas
Solution Approach 2:
The patent transitions from a conventional single-column feed slot arrangement to a multi-column segmented arrangement. By distributing feed slots across multiple columns and staggering their positions, the design creates a two-dimensional trace routing pattern that reduces trace length compared to a single linear path, enabling wide printheads to maintain voltage stability across all nozzles
2Reliability
If the electrical trace length is reduced to minimize voltage drops, then the nozzle reliability is improved, but the printhead width is constrained limiting the printable area
Solution Approach 1:
By segmenting the feed slot into multiple sections arranged in columns, the patent enables electrical traces to access feeding structures at different positions along the printhead width. This segmentation allows the traces to be shorter while still reaching all necessary nozzles across a wide printhead area, thus maintaining nozzle reliability without constraining the printable area
Solution Approach 2:
The segmented feed slot structure acts as an intermediary that facilitates efficient electrical trace routing. The multiple columns and staggered positions of feed slot sections provide intermediate access points that reduce trace length while maintaining coverage across the entire printhead width, resolving the conflict between reliability and area
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 ensures that all nozzles operate within their allowable voltage range, maintaining consistent drop sizes and high-quality print output, even in wide printheads.
Implementation Method 1
a heating element, such as a resistor, rapidly heats a small volume of liquid, forming a bubble which causes at least one drop of the liquid to be ejected
Data Source
AI summary
A printhead die is provided that includes a substrate and a slot extending through the substrate, the slot including a first slot segment and a discrete second slot segment, the second slot segment being offset from the first slot segment along a major axis and along an orthogonal minor axis.