Position Detecting Device Electrode Slit Segmentation
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Solution Overview
Problem
The integration of electromagnetic induction and electrostatic capacity type detection sections in a common input area leads to reduced detection accuracy due to eddy currents generated in the detection electrode, affecting both detection methods.
Innovation Solution
A position detecting device with a detection electrode having slits extending from the outer edge to the inner side is used to minimize eddy currents, thereby maintaining the detection accuracy of both the electrostatic capacity and electromagnetic induction type detection sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a flat detection electrode is used for electrostatic capacity detection, then the detection area is increased and human body part detection is improved, but eddy currents are generated that reduce electromagnetic induction detection accuracy
Solution Approach 1:
The detection electrode is divided into multiple segments by forming slits that extend from the outer edge toward the inner side. This segmentation interrupts the continuous conductive path, thereby suppressing eddy current formation while maintaining sufficient detection area for electrostatic capacity detection of human body parts.
2Measurement precision
If the detection electrode area is reduced to suppress eddy currents, then electromagnetic induction detection accuracy is improved, but electrostatic capacity detection capability deteriorates
Solution Approach 1:
Rather than reducing the overall electrode area, the invention segments the electrode using slits. This allows the electrode to maintain a large total area for electrostatic capacity detection while the slits interrupt eddy current paths, preserving electromagnetic induction detection accuracy.
3Adaptability or versatility
If both electromagnetic induction and electrostatic capacity detection sections are superimposed in a common input area, then device size is reduced and input method versatility is improved, but detection accuracy deteriorates due to mutual interference
Solution Approach 1:
The detection electrode is segmented with slits to suppress eddy currents, enabling the superimposition of electromagnetic induction and electrostatic capacity detection sections in a common input area without significant mutual interference, thus maintaining detection accuracy while achieving input method versatility.
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
The solution effectively suppresses eddy currents in the detection electrode, preventing the degradation of detection accuracy for both detection methods, ensuring precise position detection without increasing the device size.
Implementation Method 1
a position indicator (2) having at least one coil and adapted to generate a magnetic flux from the coil
Implementation Method 2
a substantially flat first detection section (13) having at least one detection electrode (15) arranged on one surface in an input area of the input section (4) and adapted to detect a capacitance between itself and a human body part
Implementation Method 3
the detection electrode (15) is provided with at least one slit (19) extending from an outer edge to an inner side. The magnetic flux generates an eddy current in the detection electrode (15).
Data Source
AI summary
A position detecting device includes a position indicator (2), a first detection section (13) (e.g., an electrostatic capacity type detection section) having a substantially flat shape, and a second detection section (14) (e.g., an electromagnetic induction type detection section). The position indicator (2) has a coil (27). The first detection section (13) has, on one surface thereof, detection electrodes (15) for detecting a capacitance between itself and a human body part. The second detection section (14) is provided with loop coils (24) for detecting a magnetic flux G. Further, each of the detection electrodes (15) has a substantially flat shape, and is provided with at least one slit (19) extending from the outer edge to the inside. With such a configuration, not only can degradation of detection accuracy of the first detection section be prevented or suppressed, but also degradation of detection accuracy of the second detection section can be prevented or suppressed.