Keyboard Magnetic Shield Layout for Parallel Magnet Displacement
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Solution Overview
Problem
Conventional keyboard devices have limited flexibility in design due to the restrictive structure imposed by shield frames that suppress magnetic field interference between adjacent coils, requiring vertical displacement of magnets and limiting horizontal displacement and overall design freedom.
Innovation Solution
A keyboard device with a substrate featuring a conductive pattern forming magnetic shields that allow for parallel displacement of magnets, enhancing design flexibility by suppressing magnetic field interference through a thin, ring-shaped magnetic shield configuration that maintains high detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield frame is formed like a wall rising from the magnetic detection circuit to suppress interference between magnetic fields, then magnetic field interference is suppressed, but the magnet cannot be displaced in parallel (horizontal direction) and the structure becomes restricted
Solution Approach 1:
The patent replaces the rigid wall-like shield frame with a thin film magnetic shield formed by a conductive pattern on the substrate. This thin film structure suppresses magnetic field interference between adjacent coils while allowing the magnet to be displaced in parallel (horizontal direction) relative to the magnetic detection circuit, thereby resolving the contradiction between interference suppression and displacement flexibility.
2Reliability
If a shield frame is formed like a wall rising from the magnetic detection circuit, then magnetic field interference is suppressed, but more space is required and design flexibility is reduced
Solution Approach 1:
The patent replaces the voluminous wall-like shield frame with a thin film magnetic shield formed by a conductive pattern on the substrate. This thin film structure occupies minimal space while effectively suppressing magnetic field interference between adjacent coils, thereby resolving the contradiction between interference suppression and space consumption.
Solution Approach 2:
The patent replaces the mechanical/structural shield frame with an electromagnetic-based solution using a conductive pattern on the substrate. This substitution eliminates the need for a three-dimensional wall structure, reducing the space required for the shield while maintaining its interference suppression function.
3Reliability
If a conventional shield frame structure is used, then magnetic field interference is suppressed, but the keyboard device structure is restricted and design freedom is limited
Solution Approach 1:
The patent merges the magnetic shield function with the substrate by forming a conductive pattern directly on the substrate. This integration eliminates the need for a separate shield frame structure, simplifying the overall keyboard device structure while maintaining magnetic field interference suppression, thereby resolving the contradiction between reliability and device complexity.
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 enables accurate detection of key depression information with improved design flexibility, allowing for thinner magnetic shields that reduce structural restrictions and enhance the keyboard's layout options.
Implementation Method 1
a coil which generates a magnetic field for detecting displacement of the plurality of displacement members
Implementation Method 2
a magnetic shield partitioning the plurality of coils and formed by a conductive pattern of the substrate
Data Source
AI summary
A keyboard device and a magnetic shield forming method are provided. The keyboard device includes: a plurality of displacement members (detected portions, conductors) arranged in a scale direction and displaced according to an operation of a player; and a substrate having a coil which generates a magnetic field for detecting displacement of the plurality of displacement members. The substrate includes a plurality of the coils provided respectively for the plurality of displacement members, and a magnetic shield partitioning the plurality of coils and formed by a conductive pattern of the substrate.