Electromagnetic Induction Sensor Matrix for Signal Level Optimization
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Solution Overview
Problem
Conventional electromagnetic induction type inputting apparatuses face challenges in providing a sufficient signal level to position indicators, especially when a metal member shields the signal or the loop coil is small, leading to inefficient signal transmission and increased power consumption.
Innovation Solution
The apparatus employs a sensor with multiple electrodes that transmit and receive signals to cause the resonance circuit of the position indicator to resonate, using a signal supplying circuit to optimize the magnetic field distribution, ensuring an appropriate signal level is maintained even in the presence of metal shielding or small loop coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If one loop coil just below the position indicator is used to transmit a transmission signal, then the signal level received by the position indicator is high, but it requires high voltage or high current driving or long transmission time, increasing transmission circuit scale or current consumption
Solution Approach 1:
The sensor is divided into multiple loop coils arranged in a matrix pattern rather than using a single loop coil. This segmentation allows the transmission signal to be distributed across multiple coils, reducing the current consumption and voltage requirements of individual coils while maintaining sufficient signal level at the position indicator.
Solution Approach 2:
Multiple loop coils are combined to work together in transmitting the transmission signal to the position indicator. By activating multiple coils simultaneously or in sequence, the system achieves the required signal level without requiring high voltage or current from a single coil, thus reducing overall power consumption.
2Productivity
If one loop coil just below the position indicator is used to transmit a transmission signal, then the signal transmission is efficient, but the transmission circuit scale increases due to high voltage or high current requirements
Solution Approach 1:
The transmission function is segmented across multiple loop coils with smaller individual sizes. Each coil requires less voltage and current to operate effectively, reducing the scale and complexity of the transmission circuit while maintaining efficient signal transmission to the position indicator.
Solution Approach 2:
The system transitions from using a single loop coil to a two-dimensional matrix arrangement of multiple loop coils. This dimensional change allows the transmission signal to be distributed spatially, reducing the electrical load on individual circuits and simplifying the overall transmission circuit design.
3Measurement precision
If two loop coils are used to transmit transmission signals of the same phase at the same time, then the signal level should be sufficient, but the metallic bezel shields part of the transmission signal, preventing sufficient signal level from being provided
Solution Approach 1:
The system employs multiple loop coils at different positions and orientations around the position indicator. This local quality variation ensures that even if some signal paths are blocked by the metallic bezel, other coils can provide sufficient signal transmission from different locations, compensating for the shielding effect.
Solution Approach 2:
The transmission signal path is segmented into multiple routes through different loop coils. When the metallic bezel shields certain signal paths, the system can rely on alternative segments (other loop coils) to maintain sufficient signal level at the position indicator.
4Area of stationary object
If a small loop coil is used in the sub sensor with limited space, then the space constraint is satisfied, but the transmission signal of sufficient level cannot be transmitted to the position indicator
Solution Approach 1:
The sub sensor combines multiple small loop coils to work together in transmitting the signal to the position indicator. Although each individual coil is small due to space constraints, their combined effect achieves sufficient signal level, allowing the sub sensor to function effectively within limited space.
Solution Approach 2:
The sub sensor is segmented into multiple small loop coils that collectively provide the required signal transmission capability. This segmentation allows the system to fit within the limited space of the sub sensor while maintaining adequate signal level through the cooperative operation of multiple coils.
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 approach effectively provides a consistent and sufficient signal level to the position indicator, reducing the need for high voltage or current and allowing for efficient operation even in challenging environments, such as near metal frames or in sub-sensors with limited space.
Implementation Method 1
an indicator detection apparatus which transmits a signal to an indicator (20) having a resonance circuit to cause the resonance circuit to resonate
Implementation Method 2
a signal supplying circuit which supplies a first signal to the sensor (13) so that each of the plurality of electrodes constituting the sensor generates a magnetic field to transmit the signal to the indicator
Data Source
AI summary
An inputting apparatus of the electromagnetic induction type may provide a transmission signal of a sufficient signal level to a position indicator. A process controlling unit controls a selection circuit on the basis of a reception state of a reception signal received by each of a plurality of electrodes and detected by a reception signal processing circuit such that a first signal for transmitting a transmission signal is supplied to a first electrode at which the reception signal indicates the highest signal level. Further, the process controlling unit controls the selection circuit such that a second signal is supplied to a second electrode at which the signal level of the reception signal is lower than a predetermined signal level. Consequently, signals can be transmitted to a position indicator from both the first electrode, which most receives the signal from the position indicator, and the second electrode spaced from the first electrode.