Electronic Pen Resonance Circuit Tuning via Capacitor Array Switching
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 accurately match the reference resonance frequency based on capacitance variations.
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 adjusted to match the standard value, but manufacturing errors in actual capacitor capacitance values lead to inefficiency requiring 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 simply by switching connections rather than physically cutting lines, enabling efficient reconfiguration if adjustment is needed without wasting time on repeated laser cutting processes.
Solution Approach 2:
The patent implements dynamics by replacing the static, irreversible laser cutting method with a dynamic switching mechanism. The internal capacitor array can be reconfigured by switching connections between charged and uncharged capacitive elements, allowing the reference resonance frequency to be dynamically adjusted to the standard value without permanent modifications or repeated processes.
2Manufacturing precision
If capacitors are disconnected by laser cutting based on calculated selections, then the reference resonance frequency can be matched to standard value, but improper selection due to capacitance variations results in adjustment failures
Solution Approach 1:
The patent applies feedback by measuring the actual resonance frequency of the electronic pen and comparing it to the standard value. Based on this feedback, the system determines whether additional capacitive elements need to be connected or disconnected to achieve the standard resonance frequency, ensuring accurate matching without adjustment failures.
Solution Approach 2:
The patent implements parameter changes by varying the total capacitance of the internal capacitor array through selective connection of capacitive elements with different charge states. By changing the capacitance parameter in controlled steps, the system can reliably adjust the reference resonance frequency to match the standard value regardless of initial manufacturing variations.
3Manufacturing precision
If repeated processes are performed to adjust reference resonance frequency, then the standard value can eventually be matched, but time is wasted and productivity decreases
Solution Approach 1:
The patent applies preliminary action by pre-charging capacitive elements during the manufacturing process before the electronic pen is assembled. This preliminary preparation eliminates the need for time-consuming repeated adjustment processes later, as the system can quickly reconfigure the capacitor array by simply switching connections rather than performing repeated laser cutting operations.
Solution Approach 2:
The patent replaces the mechanical laser cutting process with an electrical switching mechanism. Instead of physically cutting lines with laser (time-consuming and irreversible), the system uses electronic switches to connect or disconnect capacitive elements, dramatically reducing adjustment time while maintaining 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 allows for suitable adjustment of the reference resonance frequency, enhancing the efficiency of electronic pen communication by accurately matching the resonance frequency to standard values, reducing inefficiencies and failures.
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.