Loop Coil Position Detection Simultaneous Driving
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Solution Overview
Problem
Existing position detection devices using the electromagnetic induction method take a long time to detect the position of an electromagnetic induction pen due to the need to drive X-side loop coils one by one in sequence.
Innovation Solution
A position detection device with a plurality of first loop coils arranged in a first direction and a sensor controller that detects the amplitude of an alternating current signal generated in each loop coil while supplying a second alternating current signal, allowing simultaneous detection of the position of the electromagnetic induction pen in the first direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-side loop coils are driven one by one in sequence, then position detection accuracy is maintained, but detection time becomes excessively long
Solution Approach 1:
The patent merges the sequential driving of X-side loop coils into simultaneous parallel driving. Multiple loop coils are driven at the same time rather than one after another, which directly reduces detection time while maintaining position detection accuracy through signal processing techniques that can distinguish individual coil responses.
Solution Approach 2:
The patent employs periodic alternating current signals to drive the loop coils simultaneously. By using periodic signals with specific frequencies, the system can detect positions through frequency-based signal processing, enabling parallel operation while maintaining measurement precision through spectral analysis of the induced currents.
2Productivity
If multiple loop coils are driven simultaneously, then detection time is reduced, but signal interference between coils may increase
Solution Approach 1:
The patent applies local quality by assigning different characteristics to different loop coils in the simultaneous driving scheme. Each loop coil can be driven with locally optimized signal parameters, and the system processes signals from each coil individually, allowing parallel operation while managing interference through localized signal processing.
Solution Approach 2:
The patent implements feedback mechanisms where the detected induced currents from multiple simultaneously driven loop coils are processed to identify and compensate for interference effects. The system uses the feedback information from signal amplitude and phase measurements to correct for mutual interference between adjacent loop coils, maintaining detection accuracy despite parallel 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 approach enables the position of the electromagnetic induction pen to be detected in a shorter time compared to conventional methods, by simultaneously supplying alternating current signals to multiple loop coils.
Implementation Method 1
a position detection device that detects a position of an electromagnetic induction pen by an electromagnetic induction method (EMR method)
Data Source
AI summary
The disclosure makes it possible to detect a position of an electromagnetic induction pen in a shorter time than in the past. A position detection device includes a plurality of loop coils arranged side by side in an x-direction, and a sensor controller that detects an amplitude of an alternating current signal generated in each of the plurality of loop coils, while supplying an alternating current signal to each of the plurality of loop coils, and detects a position of an electromagnetic induction pen in the x-direction based on the amplitude of the alternating current signal detected in each of the plurality of loop coils.