Variable Film Capacitor for Resonant Frequency Adjustment
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Solution Overview
Problem
Existing position indicators require multiple capacitors to adjust resonant frequencies, increasing cost, labor, and size due to the need for multiple electronic components and complex capacitor arrangements, particularly when incorporating push switches.
Innovation Solution
A film capacitor with a dielectric film and conductor layers wound into a rod shape, featuring area-changeable conductor patterns that can be physically modified to adjust capacitance values externally, allowing for precise setting of resonant frequencies without the need for multiple capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple capacitors are used to adjust resonant frequencies, then the resonant frequency adjustment capability is improved, but the device complexity and component count increase
Solution Approach 1:
The patent combines multiple capacitor functions into a single variable capacitor that can provide multiple capacitance values. This single capacitor integrates the functionality of what would traditionally require multiple fixed capacitors, thereby reducing component count while maintaining the ability to adjust resonant frequencies across the required range.
Solution Approach 2:
The patent employs a variable capacitor whose capacitance can be dynamically changed based on writing pressure applied to the position indicator. This dynamic adjustment capability allows a single capacitor to replace multiple fixed capacitors, as the variable capacitor can assume different capacitance values to achieve different resonant frequencies as needed.
2Adaptability or versatility
If multiple capacitors are used to adjust resonant frequencies, then the resonant frequency adjustment capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple capacitor functions into a single variable capacitor that can provide multiple capacitance values. This single capacitor integrates the functionality of what would traditionally require multiple fixed capacitors, thereby reducing component count while maintaining the ability to adjust resonant frequencies across the required range.
Solution Approach 2:
The variable capacitor serves multiple functions: it provides different capacitance values for different resonant frequencies, acts as a pressure-sensitive element for position detection, and eliminates the need for multiple separate capacitor components. This multi-functionality reduces both component count and manufacturing complexity.
3Adaptability or versatility
If multiple capacitors are used to adjust resonant frequencies, then the resonant frequency adjustment capability is improved, but the device size increases
Solution Approach 1:
The patent combines multiple capacitor functions into a single variable capacitor that can provide multiple capacitance values. This single capacitor integrates the functionality of what would traditionally require multiple fixed capacitors, thereby reducing component count while maintaining the ability to adjust resonant frequencies across the required range.
4Measurement precision
If traditional capacitor adjustment methods are used, then the resonant frequency can be adjusted, but the adjustment process requires complex procedures and multiple components
Solution Approach 1:
The patent employs a variable capacitor whose capacitance can be dynamically changed based on writing pressure applied to the position indicator. This dynamic adjustment capability allows a single capacitor to replace multiple fixed capacitors, as the variable capacitor can assume different capacitance values to achieve different resonant frequencies as needed.
Solution Approach 2:
The variable capacitor automatically adjusts its capacitance value in response to writing pressure applied during position indication. This self-adjusting mechanism eliminates the need for manual selection and replacement of multiple fixed capacitors, simplifying the adjustment process while maintaining precise resonant frequency setting capability.
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
Enables easy adjustment of capacitance values in a single capacitor, optimizing resonant frequencies and reducing component count and size, thereby simplifying the position indicator design and reducing costs.
Implementation Method 1
a capacitor including a dielectric film 2, and first and second conductor layers 3, 4 which are disposed opposed to each other with the intermediary of the dielectric film 2 and are wound into a rod shape
Implementation Method 2
a film capacitor with a dielectric film and conductor layers wound into a rod shape, featuring area-changeable conductor patterns that can be physically modified to adjust capacitance values
Implementation Method 3
a first area-changeable conductor pattern 33a to 33g for allowing change in the conductor area of at least one conductor layer of the first conductor layer 3 and the second conductor layer 4 disposed on the outer circumference side of the capacitor wound into a rod shape is formed in the conductor layer
Data Source
AI summary
A pen-shaped position indicator includes: i) a cylindrical housing; ii) a core received in the cylindrical housing and having a pointer tip extend from a distal end of the cylindrical housing; iii) a resonant circuit comprised of an inductive element and a capacitor and received in the cylindrical housing, wherein an inductance of the inductive element changes in response to a pressure applied to the pointer tip of the core; iv) a connection member received in the cylindrical housing between the inductive element and the capacitor, wherein the connection member includes a distal surface facing the inductive element and a proximal surface facing the capacitor, and the connection member includes a terminal member having a distal end and a proximal end; and v) a first conductor disposed on a distal surface of the capacitor facing the proximal surface of the connection member, wherein the first conductor electrically connects the capacitor, via the at least one terminal of the connection member, to the inductive element.