Circular Position Sensor Coil Layout for Accurate Edge Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current position detection sensors are inefficient for circular display screens, as they often require a rectangular sensor area that includes wasteful unused space, and existing solutions do not accurately detect positions on circular screens without wasting sensor area.
Innovation Solution
A circular position detection sensor of the electromagnetic induction type is designed with loop coils arranged in a circular substrate, featuring straight and circumferential portions along the edge, allowing for precise position detection without wasteful sensor areas, and can be used to implement a joystick with high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a rectangular position detection sensor is used for a circular display screen, then the position detection area covers the entire screen, but the sensor area outside the inscribed circle is wasteful and not used for position detection
Solution Approach 1:
The patent applies spheroidality by configuring the position detection sensor with a circular shape instead of a rectangular shape. The sensor includes a circular substrate with loop coils arranged in a circular pattern, allowing the sensor area to perfectly match the circular display screen without any wasteful rectangular corners. This curved geometry eliminates the mismatch between rectangular sensor boundaries and circular screen edges.
2Shape
If sensor electrodes are shaped to correspond to curved corners of a display screen, then the detection area matches the screen shape, but the sensor configuration becomes complex
Solution Approach 1:
The patent segments the sensor into two distinct functional parts: loop coils arranged in a circular pattern for position detection, and separate corner detection electrodes positioned at four corners of the circular sensor. This segmentation allows the main detection area to be simple and circular while the corner electrodes independently handle the curved corner detection, simplifying the overall configuration compared to shaping all electrodes to match curved corners.
3Measurement precision
If a circular position detection sensor is designed with loop coils having both straight and circumferential portions, then position detection accuracy is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges two coil configuration approaches into a single hybrid design: loop coils that have both straight portions (extending in radial directions from the center) and circumferential portions (extending along the circular edge). This combination allows the coils to effectively detect positions both near the center and near the circular edge, improving overall detection accuracy while maintaining a unified coil structure that can be manufactured as a single integrated component.
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 circular position detection sensor effectively pinpoints indicated positions on circular screens without unnecessary sensor area usage, enabling efficient and accurate input devices, including a circular joystick configuration.
Implementation Method 1
A position detection sensor of an electromagnetic induction type connected to a position detection circuitry is provided
Data Source
AI summary
The present disclosure is directed to a position detection sensor of an electromagnetic induction type connected to a position detection circuitry. The position detection sensor includes a circular substrate, a plurality of first loop coils arranged in a first direction on the circular substrate, and a plurality of second loop coils arranged in a second direction on the circular substrate, the second direction intersecting the first direction. Each of the plurality of first loop coils includes a straight portion extending in the second direction and a circumferential portion disposed along an outer edge of the circular substrate, and each of the plurality of second loop coils includes a straight portion extending in the first direction and a circumferential portion disposed along the outer edge of the circular substrate.