Position Indicator Resonance Circuit Eliminates Battery
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Solution Overview
Problem
Position indicators for position detection apparatuses require complex circuit configurations and power supply management to control light emitting elements, especially when a power supply like a battery is needed to drive the light emitting element, which can lead to issues with cell exhaustion or charging shortages.
Innovation Solution
A position indicator with a resonance circuit including a coil and capacitor that receives signals from a position detection apparatus, using a signal generation circuit to accumulate power and generate a light emission driving controlling signal to control the light emitting element, eliminating the need for a separate power supply like a battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a battery or power supply is provided in the position indicator to drive the light emitting element, then the light emitting element can be driven to emit light, but the device complexity and power supply management become problematic
Solution Approach 1:
The patent extracts the power supply function from the position indicator by removing the battery and power management circuitry. Instead, the coil receives electromagnetic waves from the position detection apparatus to generate power through electromagnetic induction, eliminating the need for separate power supply components and simplifying the overall device structure.
Solution Approach 2:
The coil in the position indicator serves multiple functions: it acts as both the power receiving antenna and the electromagnetic coupling element for position detection. This multi-functionality reduces the number of separate components needed, thereby reducing device complexity while maintaining light emission capability.
2Illumination intensity
If a battery is used to power the light emitting element, then light emission is achieved, but reliability decreases due to cell exhaustion or charging shortages
Solution Approach 1:
The position indicator generates its own power through electromagnetic induction when receiving electromagnetic waves from the position detection apparatus. This self-powering mechanism eliminates dependency on external batteries or charging systems, ensuring continuous and reliable operation without concerns about cell exhaustion or charging shortages.
3Device complexity
If electromagnetic induction is used to power the position indicator, then power supply reliability improves and circuit complexity reduces, but the device requires a resonance circuit configuration
Solution Approach 1:
The patent employs a resonance circuit with specific inductance and capacitance values tuned to resonate at the operating frequency of the position detection apparatus. By adjusting the resonance parameters, the system achieves efficient power transfer and stable operation, making the resonance requirement a design parameter rather than a limitation.
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 simplifies the circuitry and eliminates the need for a power supply, allowing the light emitting element to be controlled directly by the position detection apparatus, enhancing reliability and reducing complexity.
Implementation Method 1
a coil for receiving power and an accumulation circuit are provided in a position indicator and an electromagnetic wave is sent from a position detection apparatus to the position indicator to allow the position indicator to generate a power supply voltage through electromagnetic induction
Implementation Method 2
a position indicator that includes a resonance circuit configured from a coil and a capacitor such that an alternating-current (AC) signal from the sensor of the position detection apparatus is received by the resonance circuit and the received AC signal is fed back from the position indicator to the sensor of the position detection apparatus
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3
AI summary
It is made possible for a position indicator of a simple configuration to perform light emission control of a light emitting element provided in the position indicator under the control of a position detection apparatus. The position indicator includes a light emitting element, a resonance circuit including a coil for transmitting and receiving a signal to and from a sensor of a position detection apparatus and a capacitor connected in parallel to the coil, and a signal generation circuit configured to accumulate power of a signal received from the sensor by the resonance circuit and generate a light emission driving controlling signal for driving and controlling the light emitting element to emit light based on the accumulated power. The light emitting element is driven and controlled by the light emission driving controlling signal generated by the signal generation circuit to perform light emission control of the light emitting element of the position indicator by the position detection apparatus.