Capacitor Trimming Electrode for Position Indicator Resonance
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Solution Overview
Problem
The existing position indicators in electromagnetic induction systems face challenges due to the use of large, costly trimmer capacitors, which hinder miniaturization, increase production costs, and complicate the adjustment process, making it difficult to create a thin pen-shaped device and limiting mass production.
Innovation Solution
A position indicator with a resonance circuit that includes a capacitance-adjusting capacitor with a trimming electrode exposed outside the casing, allowing for adjustment of resonance frequency through laser trimming, enabling miniaturization, cost reduction, and automation of the adjustment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If trimmer capacitors are used for resonance frequency adjustment, then the resonance frequency can be adjusted, but the device size increases and production cost increases
Solution Approach 1:
The patent extracts the adjustment function from a separate trimmer capacitor component and integrates it into the capacitor structure itself through the trimming electrode. This allows the adjustment function to be achieved without adding extra components, thereby reducing device size while maintaining resonance frequency adjustability.
Solution Approach 2:
The patent merges the trimming electrode with the capacitor structure, combining the capacitance function and the adjustment function into a single integrated component. This eliminates the need for separate trimmer capacitors and reduces the overall device volume.
2Manufacturing precision
If trimmer capacitors are used for resonance frequency adjustment, then the resonance frequency can be adjusted, but production cost increases
Solution Approach 1:
The patent replaces the mechanical adjustment mechanism of traditional trimmer capacitors with a laser trimming process. This substitution enables automated manufacturing, reduces labor costs, and improves production efficiency, thereby lowering overall production costs while maintaining precise resonance frequency adjustment capability.
3Manufacturing precision
If trimmer capacitors are used for resonance frequency adjustment, then the resonance frequency can be adjusted, but the adjustment process becomes complex
Solution Approach 1:
The patent extracts the adjustment functionality from a separate component and integrates it directly into the capacitor structure through the trimming electrode. This integration simplifies the overall device structure and makes the adjustment process more straightforward by eliminating the need for separate adjustment mechanisms.
4Volume of moving object
If the device is miniaturized, then the device size decreases, but mass production becomes difficult
Solution Approach 1:
The patent replaces manual mechanical adjustment with automated laser trimming, which can be easily integrated into automated production lines. This substitution enables mass production of miniaturized devices while maintaining precise resonance frequency adjustment, as the laser trimming process can be performed automatically without manual intervention.
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 use of capacitance-adjusting capacitors allows for the creation of smaller, thinner position indicators, reduces production costs, and simplifies the adjustment process, facilitating mass production and improving the overall efficiency of the position indicator.
Implementation Method 1
allowing for adjustment of resonance frequency through laser trimming
Implementation Method 2
The resonance circuit stores the electromagnetic energy on the basis of electromagnetic induction action between the resonance circuit and the loop coil of the sensor
Data Source
AI summary
A position indicator includes a resonance circuit housed in a casing and having an inductance element and a capacitor variable in capacitance, such that the resonance circuit resonates at a predetermined frequency. The position indicator is electromagnetically coupled to a position detecting device. The capacitor includes a dielectric, an electrode disposed on one side of the dielectric, and a trimming electrode disposed on another side of the dielectric such that at least one part of a region of the trimming electrode is opposed to the electrode with the dielectric interposed in between, to form the capacitance of the capacitor. The capacitor is housed in the casing such that the at least one part can be exposed from the casing. The area of the at least one part exposed from the casing to the outside is changed so as to correspond to a resonance frequency desired for the resonance circuit.