Capacitor with Adjustable Capacitance via Electrode Opening Filling
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Solution Overview
Problem
Conventional methods for adjusting capacitance in capacitors, such as those using laser irradiation, face challenges like precision issues due to heat diffusion, damage to dielectric layers, and increased costs, and may result in softening or deformation of electrodes.
Innovation Solution
A capacitor design with a pair of electrodes where one electrode has openings of varying sizes, filled with electroconductive material in descending order to adjust capacitance precisely, avoiding laser irradiation and using materials like copper or silver pastes for filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser irradiation is used to adjust capacitance by forming trimming regions or imparting electroconductivity, then capacitance adjustment is achieved, but manufacturing precision deteriorates due to heat diffusion causing softening or deformation of electrodes
Solution Approach 1:
The patent extracts the harmful thermal effect from the capacitance adjustment process by replacing laser irradiation with electroconductive paste application. The paste is applied only to specific regions that need capacitance adjustment, avoiding widespread heat diffusion that causes electrode deformation while achieving precise capacitance control through localized conductive material placement.
Solution Approach 2:
The patent replaces the thermal field (laser heating) with an electrical field approach by using electroconductive paste. Instead of using heat to change electrode properties, the invention uses conductive material application to directly modify electrical characteristics, eliminating thermal damage while achieving the same capacitance adjustment goal.
2Adaptability or versatility
If laser irradiation is applied to adjust capacitance, then capacitance can be trimmed, but harmful factors increase due to damage of dielectric layers
Solution Approach 1:
The patent converts the potential harm of excessive heat into benefit by using a cold process. Instead of risking dielectric damage through laser heating, the invention uses electroconductive paste at ambient or low temperatures, turning a thermal process into a non-thermal process that preserves dielectric integrity while achieving capacitance adjustment.
Solution Approach 2:
The patent substitutes the thermal mechanism (laser heating) with an electrical mechanism (paste application). This replacement eliminates the harmful thermal effects on dielectric layers while maintaining the ability to adjust capacitance through controlled modification of electrode conductivity in specific areas.
3Adaptability or versatility
If conventional capacitance adjustment methods are used, then capacitance can be modified, but device complexity increases due to additional processing steps and equipment
Solution Approach 1:
The patent merges the capacitance adjustment function with existing electrode fabrication processes. The electroconductive paste is applied during or after electrode formation using standard printing or deposition techniques already present in PCB manufacturing, eliminating the need for separate laser equipment and complex trimming procedures.
Solution Approach 2:
The patent uses a simple, consumable electroconductive paste material instead of expensive laser equipment and complex trimming tools. The paste can be applied using inexpensive printing methods and requires no specialized equipment, significantly reducing device complexity and manufacturing cost while achieving the same functional result.
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 allows for high-precision capacitance adjustment, achieving a precision of 99.97% within ±5% target, without the drawbacks of laser-based techniques, ensuring stable and cost-effective capacitor performance.
Implementation Method 1
one of the pair of electrodes has one or more openings for adjusting the capacitance
Implementation Method 2
one of the pair of electrodes has an area adjacent to the electrode for adjusting the capacitance by adding an electroconductive material to the area
Data Source
AI summary
The capacitance of a capacitor is adjusted by forming openings in one of a pair of electrodes of the capacitor, the openings having different sizes d1, d2, d3, . . . , wherein d1>d2>d3> . . . and being arranged in numbers n1, n2, n3, . . . , respectively; and sequentially filling a necessary number of the openings with an electroconductive material in descending order of the size so as to adjust the capacitance gradually with an increasing degree of precision. The resulting capacitor is mounted to a printed wiring board.