Inkjet Printhead Wafer Bonding Alignment
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Solution Overview
Problem
Existing manufacturing processes for inkjet printheads suffer from alignment errors of at least five microns when bonding polymer aperture plates to silicon layers, leading to inefficiencies and reduced precision in the formation of actuator arrays.
Innovation Solution
A method involving forming die sites and aperture arrays on a wafer and polymer layer respectively, aligning them, bonding, and cutting to form bonded dies, with the polymer layer's aperture arrays corresponding to the wafer's die sites, ensuring precise alignment and fluid communication between apertures and pressure chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing manufacturing processes are used to bond polymer aperture plates to silicon layers, then the manufacturing process can be completed, but alignment errors of at least five microns occur
Solution Approach 1:
Alignment marks are formed on the silicon wafer before bonding to the polymer aperture plate. This preliminary action establishes reference features that guide the positioning and alignment process, enabling sub-micron precision by providing fixed reference points before the actual bonding operation occurs.
Solution Approach 2:
The patent replaces manual or mechanical alignment methods with optical alignment techniques. Optical microscopes or alignment systems are used to visually position the polymer aperture plate relative to the alignment marks on the silicon wafer, achieving precision of less than one micron without relying on mechanical positioning systems.
2Manufacturing precision
If alignment precision is improved to less than one micron, then manufacturing efficiency and precision are enhanced, but the complexity of the bonding process increases
Solution Approach 1:
Alignment marks are pre-formed on the silicon wafer using standard photolithography techniques before the bonding step. This preliminary preparation simplifies the subsequent bonding process by providing ready-made reference features, reducing the need for complex real-time alignment mechanisms while achieving sub-micron precision.
Solution Approach 2:
The alignment marks serve as an intermediary element between the silicon wafer and the polymer aperture plate. These marks act as reference mediators that facilitate precise alignment during bonding without requiring direct complex interactions between the two components, thereby simplifying the overall process.
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 method achieves alignment errors of less than one micron, enhancing the precision and efficiency of inkjet printhead manufacturing, thereby improving imaging and printing technologies.
Implementation Method 1
bonding the wafer and the polymer layer together
Data Source
AI summary
A method enables multiple inkjet printhead dies to be manufactured by bonding a single wafer to a single polymer layer. Multiple die sites on the single wafer are arranged in a predetermined pattern that corresponds to the pattern in which a plurality of aperture arrays are arranged in the polymer layer. The die sites on the wafer and the aperture arrays in polymer layer are aligned, the wafer and polymer layer are bonded, and the bonded wafer and polymer layer are cut to form a plurality of inkjet printhead dies.