Multilayer Receiver Coil Layout for Higher-Turn Position Detection
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Solution Overview
Problem
Existing position detection devices face limitations in increasing the total number of turns of receiver coils due to the reduction in available area caused by through-conductive parts that penetrate all layers of the multilayer substrate, limiting the number of turns that can be formed on each layer.
Innovation Solution
A position detection device with a multilayer substrate having six or more wiring layers and insulating layers, where the receiver coils are wound multiple turns on each layer and connected through reduced conductive penetrating portions, allowing increased area for coil formation without penetrating all layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If through-conductive parts are used to penetrate all layers of the multilayer substrate, then electrical connection between layers is achieved, but the available area for forming receiver coils is reduced
Solution Approach 1:
The substrate is divided into multiple wiring layers (six or more) with insulating layers between them. The receiver coils are segmented across different wiring layers, with each layer contributing a portion of the total coil turns. This segmentation allows electrical connections to be made at specific points (conductive penetrating portions) rather than requiring through-conductive parts that would block the entire coil area.
Solution Approach 2:
The patent transitions from a two-dimensional coil layout to a three-dimensional multilayer structure. Receiver coils are formed across multiple wiring layers in the vertical dimension, allowing the coil to extend through the thickness of the substrate. This dimensional change enables more turns to be packed into the same footprint area while using localized conductive penetrating portions for inter-layer connections.
2Measurement precision
If the number of turns of receiver coils is increased, then detection accuracy is improved, but the area required for coil formation increases
Solution Approach 1:
The patent utilizes the vertical dimension by forming receiver coils across multiple wiring layers (six or more layers). Each wiring layer contributes a portion of the total coil turns, allowing the cumulative number of turns to increase significantly without expanding the planar footprint. The conductive penetrating portions provide vertical electrical pathways that enable this multilayer coil construction.
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 enhances the available area for forming receiver coils, enabling a higher total number of turns and improving the detection accuracy and efficiency of the position detection device.
Implementation Method 1
first and second receiver coils formed in the substrate and inductively coupled by electromagnetic induction caused by energizing the transmitter coil
Data Source
AI summary
A position detection device includes a substrate, a transmitter coil formed in the substrate, and first and second receiver coils formed in the substrate and inductively coupled by electromagnetic induction caused by energizing the transmitter coil. The substrate is a multilayer substrate with six or more wiring layers and insulating layers alternately arranged between each of the wiring layers. The substrate includes a plurality of conductive penetrating portions each formed to penetrate at least one of the insulating layers so as to connect the six or more wiring layers. Each of the first and second receiver coils is wound a plurality of turns in each wiring layer, excluding at least one wiring layer, among the six or more wiring layers, and is connected through the conductive penetrating portions. At least one of the conductive penetrating portions is disposed inside each of the first and second receiver coils.