Magnetic Induction Sensor for Keyboard Key Detection
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Solution Overview
Problem
Magnetic induction type sensors in electronic keyboards face challenges in controlling the magnetic field to accurately detect keypress operations, leading to interference between adjacent keys and reduced measurement accuracy.
Innovation Solution
The use of a magnetic induction type sensor with a fixed positional relationship between a coil and a magnetic material, where the magnetic material forms an open magnetic circuit with the coil, allowing for controlled magnetic field range and reduced interference between adjacent keys, enabling precise keypress amount measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic induction type sensor is used to detect keypress operations, then the detection capability is provided, but interference between adjacent keys occurs and measurement accuracy is reduced
Solution Approach 1:
The magnetic material is configured with specific local properties (high permeability) and positioned strategically between the coil and conductor to create a localized magnetic field concentration. This ensures the magnetic field is confined to the intended sensing region, preventing interference with adjacent keys while maintaining detection accuracy.
Solution Approach 2:
The magnetic material acts as an intermediary element that mediates the magnetic field between the coil and conductor. It shapes and directs the magnetic flux through its high permeability特性, ensuring the field reaches the intended target without spreading to adjacent sensing zones, thus eliminating interference.
2Reliability
If the magnetic field range is expanded to improve detection, then the sensing capability is enhanced, but interference between adjacent keys increases
Solution Approach 1:
The magnetic material is positioned and dimensioned to create a localized magnetic field concentration exactly where needed for sensing. Its high permeability ensures the field is confined to the specific region between the coil and conductor, providing reliable detection without expanding the field range to interfere with adjacent keys.
Solution Approach 2:
The magnetic field is effectively segmented into discrete zones by positioning magnetic materials for each sensor independently. Each magnetic material confines its associated magnetic field to a specific spatial region, allowing multiple sensors to operate reliably in close proximity without mutual interference.
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 solution improves the measurement accuracy of keypress amounts by controlling the magnetic field and reducing interference between sensors, resulting in a more reliable and precise keyboard apparatus.
Implementation Method 1
The non-contact type sensor includes, for example, a magnetic induction type sensor
Implementation Method 2
a first magnetic material that forms an open magnetic circuit together with the first coil
Data Source
AI summary
An input device includes a first operating element and a first sensor. The first sensor includes a first conductor, a first coil, and a first magnetic material forming an open magnetic circuit together with the first coil. A positional relationship between the first coil and the first magnetic material is fixed. A first distance between a first end portion of the first magnetic material and the first conductor varies according to the amount of operation on the first operating element. The first sensor outputs a first signal corresponding to the first distance.