Electrostatic Actuator Membrane Manufacturing via Etch Stop Layer
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Solution Overview
Problem
The manufacturing of electrostatically actuated ink jet printheads faces challenges in forming small actuator membranes, which are prone to cracking and difficult to produce efficiently, especially as the physical size of actuators decreases and the number of nozzles increases within a given area.
Innovation Solution
A method involving the formation of electrostatic actuator membranes on an etch stop layer, with a handle layer interposed between the membranes and the etch stop layer, allowing for simultaneous assembly onto a printhead drive assembly and subsequent removal of the handle and etch stop layers to streamline the assembly process and increase manufacturing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the physical size of actuators is decreased to increase the number of nozzles within a given area, then the nozzle density increases, but the actuator membranes become increasingly difficult to form and are prone to cracking
Solution Approach 1:
The patent segments the actuator membrane formation process by introducing an etch stop layer that divides the membrane into multiple sections. This segmentation allows each membrane to be formed independently with proper spacing, preventing cracking while maintaining small dimensions for high nozzle density.
Solution Approach 2:
The etch stop layer acts as an intermediary element between the actuator membranes and the substrate. It provides mechanical support during the formation process and enables precise spacing between adjacent membranes, making it easier to manufacture small actuators without cracking.
2Productivity
If traditional methods are used to form arrays of electrostatic actuators, then manufacturing complexity increases, but a simplified method would increase manufacturing throughput
Solution Approach 1:
The patent merges multiple formation steps into a single integrated process. By forming multiple actuator membranes simultaneously on the etch stop layer and then removing the layer together, the method reduces the number of separate operations required, thereby increasing manufacturing throughput while simplifying the overall process.
Solution Approach 2:
The etch stop layer is prepared in advance as a preliminary structure that facilitates subsequent membrane formation. This pre-prepared layer provides a convenient platform for forming multiple membranes with correct spacing before final assembly, reducing the complexity of the overall manufacturing 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 approach simplifies the assembly of electrostatic actuator arrays, enhancing manufacturing efficiency and reducing costs by allowing for the simultaneous formation and attachment of multiple actuator membranes, thereby improving the yield and reducing the complexity of forming small actuator membranes.
Implementation Method 1
electrostatic actuators include the use of an electrode that, when powered through a supplied voltage, attracts and flexes a silicon membrane
Implementation Method 2
When the voltage is removed from the electrode, the silicon membrane relaxes, thereby increasing pressure in the ink chamber and ejecting ink from a nozzle
Data Source
AI summary
A method for forming a plurality of electrostatic actuator membranes for an electrostatically actuated ink jet printhead. The method can include forming a blanket actuator membrane layer on an etch stop layer, where the etch stop layer is interposed between the blanket membrane layer and a handle layer such as a semiconductor wafer. The blanket actuator membrane layer is patterned to form a plurality of actuator membranes. The plurality of actuator membranes is attached to a printhead drive assembly that includes circuitry for actuating the plurality of actuator membranes. Subsequently, the handle layer and etch stop layer are removed, thereby leaving the plurality of actuator membranes attached to the printhead drive assembly.