Nanomaterial Layer Shields Silver Paste Conductors from Sulfur
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Solution Overview
Problem
Conventional membrane circuit boards in keyboard devices are prone to increased conductive impedance due to sulfur-containing air reacting with silver paste conductor lines, and the alignment of carbon ink protective layers with silver paste conductor lines is difficult, affecting electrical connections.
Innovation Solution
A membrane circuit board design incorporating a nanomaterial layer with polymeric structures on flexible circuit boards and junction regions to prevent chemical contact with silver paste conductor lines, using a nonpolar compound like silicon dioxide as the backbone, which repels sulfur and maintains conductive impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver paste conductor lines are used in the membrane circuit board, then good electrical conductivity is achieved, but the conductor lines react with sulfur-containing air to form silver sulfide, increasing conductive impedance
Solution Approach 1:
A nanomaterial layer comprising polymeric structures is introduced as an intermediary between the silver paste conductor lines and the external environment. This nanomaterial layer acts as a protective barrier that prevents sulfur-containing air from contacting the silver paste conductor lines, thereby preventing the formation of silver sulfide and maintaining electrical conductivity without affecting the conductive performance of the silver paste lines.
Solution Approach 2:
The nanomaterial layer creates an inert protective environment around the silver paste conductor lines by repelling sulfur-containing gases. This inert barrier isolates the reactive silver paste from harmful external chemicals, allowing the conductor lines to maintain their low conductive impedance over time without degradation from sulfur exposure.
2Object-affected harmful factors
If carbon ink protective layers are used to protect silver paste conductor lines, then protection is provided, but alignment with the conductor lines is difficult, affecting electrical connections
Solution Approach 1:
The invention changes the material parameters by using nanomaterials with specific polymeric structures that possess inherent repulsive properties against sulfur-containing gases. This material parameter change enables the protective layer to function effectively without requiring precise alignment, as the nanomaterial layer can be applied more flexibly while still providing comprehensive protection to the conductor lines.
3Reliability
If a protective layer is added to prevent sulfur contact, then conductive impedance stability is improved, but device structure becomes more complex
Solution Approach 1:
The invention employs a thin film nanomaterial layer that conforms to the surface of the flexible circuit board and conductor lines. This thin film structure provides effective protection against sulfur contact while maintaining the flexibility and overall simplicity of the membrane circuit board structure, avoiding significant increases in device complexity.
Solution Approach 2:
The protective structure utilizes composite materials combining the nanomaterial layer with the existing flexible circuit board and silver paste conductor lines. This composite approach integrates the protective function into the existing structure rather than adding separate complex components, thereby maintaining structural simplicity while achieving reliable protection against sulfur-containing air.
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 nanomaterial layer effectively shields silver paste conductor lines from sulfur, preventing the formation of silver sulfide and ensuring stable electrical connections by repelling sulfur-containing gases and aligning with conductor lines without short-circuiting adjacent pins.
Implementation Method 1
The nanomaterial layer comprises plural polymeric structures and is formed on the first flexible circuit board, the second flexible circuit board, and/or a junction region between an edge of the first flexible circuit board and the second flexible circuit board to prevent at least one of the upper metallic conductor line and the lower metallic conductor line from contacting with a specified chemical element
Data Source
AI summary
A membrane circuit board includes a first flexible circuit board, a second flexible circuit board and a nanomaterial layer. The nanomaterial layer includes plural polymeric structures. The nanomaterial layer is formed on the first flexible circuit board, the second flexible circuit board and/or a junction region between the edge of the first flexible circuit board and the second flexible circuit board to prevent at least one of the upper metallic conductor line and the lower metallic conductor line from contacting with a specified chemical element. Consequently, the conductive impedance of the upper metallic conductor line and the lower metallic conductor line is not affected by the specified chemical element. Moreover, the present invention also provides a keyboard device with the membrane circuit board.