Dual-Layer Electrostatic Pad Layout for Stronger Carbon Sheet Pickup
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Solution Overview
Problem
Conventional electrostatic pad designs used for picking up dry carbon fiber sheets suffer from limitations in adhesion strength, which affects the efficiency of 2D and 3D pick-and-place operations.
Innovation Solution
The electrostatic pad features a dual-layer configuration with first and second planar arrays of electrodes arranged in checkerboard patterns, separated by a third layer of electrically insulative material. This design allows for a significant voltage difference to be applied without arcing, enhancing adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional single-layer electrostatic pad designs are used, then the device complexity is low, but the adhesion strength is insufficient
Solution Approach 1:
The patent transitions from a conventional single-layer electrode configuration to a dual-layer planar array configuration. The first planar array includes first electrodes arranged in a first pattern, while the second planar array includes second electrodes arranged in a second pattern that is offset from the first pattern. This dimensional transition to a three-dimensional stacked arrangement enables significantly enhanced adhesion strength by providing multiple electrostatic interaction planes between the pad and carbon fiber sheets, while maintaining manageable device complexity through systematic pattern design.
Solution Approach 2:
The electrostatic pad is segmented into distinct functional layers: a first planar array of electrodes, a second planar array of electrodes offset from the first, and insulative material layers separating them. This segmentation allows each layer to contribute independently to the overall adhesion function, with the first array providing primary electrostatic attraction and the second array providing enhanced attraction and field distribution, thereby achieving superior adhesion strength through cumulative effect of segmented components.
2Strength
If higher voltage difference is applied to enhance adhesion, then the adhesion strength improves, but arcing between adjacent electrodes occurs
Solution Approach 1:
Insulative material is introduced as an intermediary between the first and second planar arrays of electrodes. This insulative material fills the spaces between adjacent electrodes in both arrays and prevents direct electrical breakdown and arcing between them. The intermediary insulative material allows higher voltage differences to be applied across the electrode arrays to enhance adhesion strength while maintaining electrical isolation that prevents harmful arcing, thus resolving the contradiction between achieving strong adhesion and avoiding electrical breakdown.
3Use of energy by moving object
If the second pattern is offset from the first pattern, then the voltage difference can be increased without arcing, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric pattern design where the second planar array of electrodes is deliberately offset from the first planar array. The first pattern and second pattern are not identical; instead, they are positioned with specific offset distances that create non-overlapping electrode configurations. This asymmetric arrangement increases the minimum spacing between electrodes from different arrays, allowing higher voltage differences to be applied without causing arcing, while the offset distance can be optimized to balance manufacturing precision requirements with electrical performance.
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
The dual-layer electrostatic pad achieves improved adhesion strength, enabling efficient pick-up and transport of dry carbon fiber sheets in 2D and 3D operations without compromising the integrity of the sheets.
Implementation Method 1
An electrostatic pad may be electrified to produce a voltage difference thereacross, which thereby presents an electrostatic adhesion potential across the pad. This electrostatic adhesion may then be used to attract and retain a dry carbon fabric sheet in contact with the pad
Implementation Method 2
setting up opposing charges on the sheet due to the electric field; and electrostatically adhering the sheet to the electrostatic pad
Data Source
Figure 1~3
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Figure 7~10
AI summary
An electrostatic pad includes a first planar array of first electrodes arranged in a first pattern, and a second planar array of second electrodes arranged in a second pattern that is different from the first pattern, wherein the first and second planar arrays are disposed parallel to each other. A third layer of electrically insulative material may be sandwiched between the first and second planar arrays of respective first and second electrodes.