Electronic Pen Dual-Capacitor Charging for Response and Stability
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Solution Overview
Problem
Electromagnetic induction type electronic pens face a trade-off between responsiveness and stable operation due to the capacitance of the storage capacitor, where increasing capacitance for energy accumulation slows response speed and decreasing it compromises stability.
Innovation Solution
Incorporating a larger capacitance third capacitor that accumulates excess energy when the rectified output voltage exceeds a predetermined value, allowing the second capacitor to have a smaller capacitance for faster response and maintaining stable operation by using the stored voltage from the third capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance of the storage capacitor is increased to accumulate more energy, then stable operation is improved, but response speed deteriorates
Solution Approach 1:
The patent divides the single storage capacitor into two separate capacitors: a first storage capacitor with smaller capacitance for fast response and a second storage capacitor with larger capacitance for stable operation. This segmentation allows each capacitor to perform its specialized function without compromising the other, resolving the contradiction between response speed and stable operation.
2Speed
If the capacitance of the storage capacitor is decreased to improve response speed, then response speed is improved, but stable operation deteriorates
Solution Approach 1:
The patent divides the single storage capacitor into two separate capacitors: a first storage capacitor with smaller capacitance for fast response and a second storage capacitor with larger capacitance for stable operation. This segmentation allows each capacitor to perform its specialized function without compromising the other, resolving the contradiction between response speed and stable operation.
3Device complexity
If a single capacitor is used for both fast response and energy accumulation, then device complexity is reduced, but performance compromise occurs
Solution Approach 1:
The patent divides the single storage capacitor into two separate capacitors: a first storage capacitor with smaller capacitance for fast response and a second storage capacitor with larger capacitance for stable operation. This segmentation allows each capacitor to perform its specialized function without compromising the other, resolving the contradiction between response speed and stable operation.
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 configuration enables the electronic pen to achieve both fast response speed and stable operation by effectively accumulating excess energy, ensuring continuous functionality even when energy received through the resonance circuit is reduced.
Implementation Method 1
an electronic pen is known which receives an electromagnetic wave from the position detecting device by a resonance circuit constituted of a coil and a capacitor
Implementation Method 2
a rectifier circuit which, in operation, rectifies an alternating-current signal received by the resonance circuit
Implementation Method 3
the parallel resonance circuit 3 performs the resonant operation
Data Source
AI summary
An electronic pen includes a coil wound around a magnetic core, a first capacitor forming a resonance circuit with the coil, a rectifier circuit which, in operation, rectifies an alternating-current signal received by the resonance circuit, the rectifier circuit including a second capacitor, a voltage detecting circuit which, in operation, detects whether a rectified output voltage across the second capacitor of the rectifier circuit exceeds a predetermined value, a third capacitor having a capacitance that is larger than a capacitance of the second capacitor, and a charge control circuit which, in operation, controls supply of a charging current to the third capacitor by the rectified output voltage. The charge control circuit in operation, causes the charging current to be fed to the third capacitor by the rectified output voltage when the voltage detection circuit detects that the rectified output voltage obtained across the second capacitor exceeds the predetermined value.