Electronic Pen Power Circuit for Fast Response and Stable Operation
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Solution Overview
Problem
Conventional 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
The electronic pen incorporates a rectifier circuit with a small second capacitor for rapid voltage storage and a larger third capacitor for energy accumulation, controlled by a charge control circuit that feeds excess energy to the third capacitor when the voltage exceeds a predetermined value, allowing for faster response and stable operation.
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 small capacitance for rapid charging and response, and a second storage capacitor with large capacitance for energy accumulation and stable operation. This segmentation allows each capacitor to specialize in one function, resolving the contradiction between response speed and stable operation.
Solution Approach 2:
The patent introduces a switching circuit as an intermediary component that controls the charging paths of the two capacitors. The switching circuit directs charging current to the first capacitor during initial charging for fast response, and to the second capacitor for energy accumulation, thereby mediating between the conflicting requirements of 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 segments the storage function into two capacitors with different capacitance values. The first capacitor with small capacitance provides fast response by charging quickly, while the second capacitor with large capacitance ensures stable operation by storing sufficient energy. This segmentation eliminates the need to compromise between response speed and stable operation in a single capacitor.
Solution Approach 2:
The patent adds a new dimension to the energy storage system by introducing a second capacitor with different capacitance characteristics. This dimensional expansion allows the system to simultaneously achieve fast response (through the first capacitor) and stable operation (through the second capacitor), rather than being constrained to a single capacitance value.
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 efficiently 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 5 includes two diodes 6 and 7 and a capacitor 8 that stores a rectified output voltage
Implementation Method 3
a parallel resonance circuit 3 is formed by connecting a resonance capacitor 2 in parallel with a coil 1 wound around a magnetic core
Data Source
AI summary
An electronic pen includes a rectifier circuit, a first integrated circuit, and a second integrated circuit. The rectifier circuit, in operation, stores a voltage in a first capacitor based on energy received from a position detecting device. The first integrated circuit operates using the voltage stored in the first capacitor. The first integrated circuit, in operation, controls transmission of a first signal that is wirelessly transmitted from a pen tip. The second integrated circuit, in operation, wirelessly transmits a second signal after the voltage stored in the first capacitor is greater than a predetermined voltage.