Printed Wiring Board Capacitor Electrode Protection
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Solution Overview
Problem
Conventional printed wiring boards with capacitors exhibit large deviations in actual electrostatic capacity from target values due to damage to the outer periphery of the upper electrode during the dielectric shaping process, leading to poor dielectric dissipation factors and increased power loss.
Innovation Solution
The method involves forming a capacitor with a dielectric having a high dielectric constant, where the upper electrode is protected during blasting to prevent damage, and the dielectric is shaped to have a larger area than the upper electrode, with precise patterning to minimize dispersion in electrostatic capacity, and the lower electrode is also shaped with high precision to ensure accurate capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the dielectric is shaped by blasting to match the electrode area, then the manufacturing precision of electrode-dielectric alignment is improved, but the outer periphery of the upper electrode is damaged
Solution Approach 1:
The upper electrode is formed in advance before the dielectric shaping process. This preliminary formation allows the electrode to serve as a protective shield during subsequent blasting operations, preventing damage to the electrode's outer periphery while enabling precise dielectric shaping to match the electrode area.
Solution Approach 2:
The upper electrode acts as an intermediary protective layer during the dielectric shaping process. By having the electrode already in place, it mediates the blasting process, absorbing or deflecting abrasive particles that would otherwise damage the electrode's outer periphery while allowing precise shaping of the dielectric.
2Reliability
If the dielectric area is made larger than the electrode area, then the dielectric dissipation factor is improved, but the electrostatic capacity dispersion increases
Solution Approach 1:
The invention intentionally creates an asymmetric configuration where the dielectric area extends beyond the electrode area. This asymmetric design allows the dielectric to have a larger surface area for improved dissipation factors while the electrode maintains its precise patterned area for consistent electrostatic capacity. The asymmetry resolves the contradiction by allowing different functional requirements to be optimized independently.
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 results in a printed wiring board capacitor with reduced dispersion in electrostatic capacity, improved dielectric dissipation, and minimized power loss, achieving a more precise and efficient electrostatic performance compared to conventional methods.
Implementation Method 1
placing a dielectric sheet having a high dielectric constant to entirely cover the surface of the core layer and the first electrode, thermosetting the dielectric sheet to form a dielectric layer having a high dielectric constant
Implementation Method 2
injecting a liquid containing abrasives by blasting toward the dielectric layer with the second electrode as a shield such that the dielectric layer is shaped in a same form as the second electrode
Data Source
AI summary
A printed wiring board includes a capacitor including a dielectric body having a first surface and a second surface, a first electrode provided on the first surface of the dielectric body, and a second electrode provided on the second surface of the dielectric body. The first electrode has an area facing and being smaller than the first surface of the dielectric body, and the second electrode has an area facing and being larger than the second surface of the dielectric body.