Capacitive Touch Housing Patterning for Curved Surface Adhesion
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Solution Overview
Problem
Conventional methods for forming capacitive touch sensor arrays on curved and bent surfaces are time-consuming, power-intensive, and prone to damaging insulating substrates due to the large area removal of metal layers by laser ablation, resulting in low adherence of circuit patterns.
Innovation Solution
A method involving forming a non-patterned active metal layer on a housing wall, patterning it using laser ablation to create separated plating and non-plating portions, and then depositing a metal layer on these portions, with electroplating and electroless deposition techniques to form a layered structure for capacitive touch sensor units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser ablation is used to pattern metal layers on curved surfaces, then circuit patterns can be formed, but the process is time-consuming and power-intensive
Solution Approach 1:
The patent applies preliminary action by first forming a complete metal layer across the entire curved surface before laser patterning. This preliminary metal layer serves as a uniform base that simplifies subsequent patterning operations, allowing the laser to work on a consistent surface rather than attempting to deposit metal on complex curved geometries directly.
Solution Approach 2:
The patent segments the patterning process into distinct stages: first forming the complete metal layer, then using laser ablation to remove unwanted portions. This segmentation separates the deposition phase from the patterning phase, allowing each to be optimized independently and reducing overall processing time.
2Manufacturing precision
If conventional laser ablation removes large areas of metal layer, then circuit patterns are formed, but power consumption increases and substrate damage occurs
Solution Approach 1:
The patent converts the potentially harmful effect of laser ablation into a beneficial process by using it selectively to remove only the portions of metal layer that are not needed for the circuit pattern. By having the complete metal layer already in place, the laser only needs to ablate minimal areas to create the desired pattern, transforming a high-power destructive process into a precise, low-power patterning tool.
Solution Approach 2:
The patent applies local quality by ensuring the metal layer is present only where needed for the circuit pattern after laser patterning. The preliminary complete metal layer allows the laser to create locally precise patterns without affecting adjacent areas, minimizing unnecessary material removal and reducing overall power consumption.
3Ease of manufacture
If conventional methods form metal layers on curved surfaces, then capacitive touch sensors are created, but adherence of circuit patterns to substrate is low
Solution Approach 1:
The patent applies preliminary action by forming the complete metal layer across the entire curved surface before patterning. This preliminary layer adheres to the substrate under uniform conditions, ensuring consistent adhesion strength across all areas. The subsequent laser patterning then creates the circuit pattern from this well-adhered base layer, preserving the strong substrate-metal connection while achieving the desired pattern geometry.
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 enhances the efficiency and adherence of capacitive touch sensor patterns on curved surfaces, reducing time and power consumption while minimizing damage to the substrate, enabling effective touch input functions on electronic devices.
Implementation Method 1
the active metal layer being made from an active material containing an active metal that is capable of catalytically initiating the forming of the metal layer
Implementation Method 2
patterning the non-patterned active metal layer on the housing wall by laser ablation
Implementation Method 3
forming a metal layer on the patterned active metal layer
Data Source
AI summary
A method for making a capacitive touch sensitive housing, comprises: forming a non-patterned active metal layer on a housing wall; patterning the non-patterned active metal layer on the housing wall by laser ablation such that the non-patterned active metal layer is formed into a patterned active metal layer including a plurality of plating portions separated from each other, and a plurality of non-plating portions separated from the plating portions; and forming a metal layer on the patterned active metal layer such that the metal layer has first portions formed on the plating portions of the patterned active metal layer, and second portions formed on the non-plating portions of the patterned active metal layer.