Electroplating Electrical Components with Lift-off Layer
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Solution Overview
Problem
Existing electrical component manufacturing processes, such as subtractive and additive processes, face challenges including slow deposition rates, adhesion issues due to high pH environments, and difficulties with auxiliary conductors affecting antenna performance.
Innovation Solution
The process involves depositing a lift-off layer and a seed layer on a substrate, followed by electroplating a plating layer, which forms a circuit and plating electrodes. The lift-off layer is removable, allowing the seed and plating layers to be separated from the substrate, addressing adhesion and auxiliary conductor issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If electroless copper plating is used, then adhesion is improved, but deposition rate is slow and requires long immersion time
Solution Approach 1:
The patent changes the pH parameter of the plating bath from high (electroless) to low (electrolytic), and changes the deposition mechanism from chemical to electrical. This allows fast deposition rates while using a brief alkaline dip afterward to restore adhesion, resolving the contradiction between adhesion strength and productivity.
Solution Approach 2:
The patent performs preliminary electroplating in an acidic bath before the substrate is exposed to high pH environments. This preliminary action deposits copper rapidly while the substrate is still protected, and then a brief alkaline dip restores adhesion properties before final assembly, preventing adhesion loss while maintaining high productivity.
2Productivity
If electrolytic plating is used, then deposition rate is improved, but adhesion deteriorates due to high pH degradation of binder
Solution Approach 1:
The patent performs preliminary electroplating in an acidic bath before the substrate is exposed to high pH environments. This preliminary action deposits copper rapidly while the substrate is still protected, and then a brief alkaline dip restores adhesion properties before final assembly, preventing adhesion loss while maintaining high productivity.
Solution Approach 2:
The patent changes the pH parameter of the plating bath from high (electroless) to low (electrolytic), and changes the deposition mechanism from chemical to electrical. This allows fast deposition rates while using a brief alkaline dip afterward to restore adhesion, resolving the contradiction between adhesion strength and productivity.
3Ease of manufacture
If auxiliary conductors are added for electrolytic plating, then plating process is enabled, but antenna performance is affected
Solution Approach 1:
The patent extracts and removes the auxiliary conductor after it has served its purpose during electroplating. The auxiliary conductor is used only temporarily to enable the plating process, then removed to eliminate its harmful effect on antenna performance, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The auxiliary conductor is discarded after use in the plating process. It serves its function of enabling electrolytic plating, then is removed from the final product to prevent interference with antenna operation, allowing the manufacturing benefit to be retained while the harmful effect is eliminated.
4Adaptability or versatility
If photo-resist etch plate is created for new geometry, then circuit geometry can be made, but time and money investment is required
Solution Approach 1:
The patent replaces the mechanical/photochemical subtractive process (photo-resist etching) with an additive electroplating process. Conductive ink patterns are directly deposited and plated to form circuits, eliminating the need for photo-resist plates and enabling rapid geometry changes without setup time, resolving the contradiction between adaptability and time loss.
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 enables quick and efficient manufacturing of electrical components with improved adhesion and reduced interference from auxiliary conductors, ensuring uniform thickness and spacing of conductive traces, enhancing the performance of components like antennas.
Implementation Method 1
A seed layer is electrodeposited on the substrate
Implementation Method 2
A plating layer is electrodeposited on the seed layer
Data Source
AI summary
An electrical component includes a substrate having a circuit area and a sacrificial area. A lift-off layer is deposited on the substrate in the sacrificial area. A seed layer is deposited on the substrate in the circuit area and on the lift-off layer in the sacrificial area. A plating layer is electrodeposited on the seed layer. The plating layer forms a circuit in the circuit area. The plating layer forms plating electrodes in the sacrificial area. The lift-off layer is removable from the substrate. The seed layer and the plating layer on the lift-off layer are removed with the lift-off layer when the lift-off layer is removed from the substrate, leaving the circuit on the substrate. The lift-off layer may be dissolved after the plating layer is formed, where the plating layer deposited on the lift-off layer is removed as the lift-off layer is dissolved.