EMR Pen Resonance Circuit Calibration Using Internal Capacitor Arrays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Manufacturing errors in the capacitance of capacitors within electronic pens using electromagnetic resonance (EMR) methods lead to inefficiencies in adjusting the reference resonance frequency, often requiring repeated processes to match standard values, which can result in improper adjustments or failures.
Innovation Solution
An electronic pen with a coil, external capacitor, and integrated circuit featuring an internal capacitor array, where the state of capacitive elements is changed to adjust the resonance frequency, utilizing measuring and adjusting means to measure and adjust the capacitance, allowing for precise matching of the reference resonance frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple capacitors are pre-arranged in parallel and lines are cut by laser to disconnect capacitors based on standard capacitance values, then the reference resonance frequency can be matched to the standard value, but manufacturing errors in actual capacitor capacitance values lead to inefficiency and repeated adjustment processes
Solution Approach 1:
The patent applies preliminary action by pre-charging specific capacitive elements in the internal capacitor array to a first potential before final assembly. This preliminary charging state allows the resonance frequency to be adjusted by selectively connecting or disconnecting pre-charged capacitive elements, enabling precise frequency matching without repeated laser cutting operations. The preliminary preparation of capacitor states resolves the contradiction by enabling accurate frequency adjustment while maintaining production efficiency.
2Ease of manufacture
If capacitor capacitance values are assumed to be standard values, then the adjustment process can be simplified, but actual manufacturing errors cause improper adjustments or failures
Solution Approach 1:
The patent implements feedback by measuring the actual resonance frequency of the electronic pen and using this measurement to determine which capacitive elements to connect or disconnect. The resonance frequency measurement provides feedback about the actual capacitance state, allowing the system to automatically adjust the capacitor configuration to achieve the target resonance frequency. This feedback mechanism resolves the contradiction by maintaining both simplicity and reliability in the adjustment process.
Solution Approach 2:
The patent applies parameter changes by dynamically altering the capacitance of the resonance circuit through selective connection and disconnection of capacitive elements with different capacitance values. Instead of relying on fixed standard capacitor values, the system changes the total capacitance parameter based on measured resonance frequency deviations, enabling accurate frequency matching that accounts for manufacturing variations while maintaining procedural simplicity.
3Manufacturing precision
If too many capacitors are disconnected to compensate for capacitance variations, then the reference resonance frequency may be adjusted, but the process becomes inefficient and may fail to achieve proper adjustment
Solution Approach 1:
The patent applies preliminary action by pre-charging specific capacitive elements before final assembly and configuration. This preliminary preparation allows the system to achieve precise resonance frequency adjustment by selectively connecting or disconnecting a minimal number of pre-prepared capacitive elements, rather than disconnecting multiple capacitors through repeated trial and error. The preliminary organization of capacitor states significantly reduces adjustment time while maintaining manufacturing precision.
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 enables efficient and accurate adjustment of the reference resonance frequency, reducing inefficiencies and failures associated with manufacturing errors, ensuring proper communication between the pen and position detection apparatus.
Implementation Method 1
When the resonance circuit enters the magnetic field, the coil generates an induced electromotive force that allows the resonance circuit to accumulate electric power
Implementation Method 2
An electronic pen for use by input systems based on the electromagnetic resonance (EMR) method includes an LC resonance circuit including a coil excited by a magnetic field transmitted from a sensor coil of a position detection apparatus and a capacitor connected in parallel with the coil
Data Source
AI summary
A method is provided for adjusting the resonance frequency of a resonance circuit included in an electronic pen. The method uses adjusting means for adjusting the capacitance of an internal capacitor array and measuring means for measuring an alternating magnetic field generated by the resonance circuit. The method includes (1) a step of changing the state of a predetermined portion of multiple capacitive elements constituting the internal capacitor array, and (2) a step of changing, according to reference resonance frequency variations of the resonance circuit before and after the state change, the state of a portion or all of at least one capacitive element constituting the inner capacitor array other than said predetermined portion of the capacitive elements.