Magnetic Fluid Touch Panel for Deformable Stiffness Control
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Solution Overview
Problem
Conventional touch panel systems, such as capacitance, resistive membrane, ultrasonic surface acoustic wave, and optical types, have complex device structures, high manufacturing costs, and are not deformable during use, with issues in low-illumination environments and temperature sensitivity, especially when using infrared thermography cameras.
Innovation Solution
A touch panel system featuring a bag-shaped design with a flexible touch face and counterface, using a magnetic fluid that blocks or absorbs electromagnetic waves, a camera for image analysis, and a magnetic field control mechanism to adjust the touch panel's stiffness and shape in real time, allowing deformation and operation in various environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional touch panel systems (capacitance, resistive membrane, ultrasonic surface acoustic wave, optical type) are used, then touch detection function is achieved, but device structure becomes complex and manufacturing cost increases
Solution Approach 1:
The patent changes the detection parameter from electrical properties (capacitance, resistance) or mechanical properties (ultrasonic waves) to optical properties (electromagnetic wave absorption). By using magnetic fluid that absorbs electromagnetic waves and a camera to detect the absorbed regions, the system achieves touch detection with a simple structure consisting of only the magnetic fluid-containing bag and camera, eliminating complex electrode arrangements or ultrasonic generators
Solution Approach 2:
The patent replaces the mechanical and electrical detection systems with an optical detection system. Instead of using capacitance sensors, resistive membranes, or ultrasonic waves, the system uses electromagnetic wave absorption by magnetic fluid to detect touch positions, thereby simplifying the device structure while maintaining detection functionality
2Reliability
If infrared thermography camera is used to detect heat sources, then touch detection is achieved, but the system becomes sensitive to ambient temperature and cannot detect touches by non-heat-emitting objects
Solution Approach 1:
The patent changes the detection parameter from thermal radiation (infrared) to electromagnetic wave absorption. By using magnetic fluid that absorbs electromagnetic waves in the visible or near-infrared range and a camera to detect the absorbed regions, the system achieves touch detection that is independent of ambient temperature and capable of detecting touches by any object, including those that do not emit heat
Solution Approach 2:
The patent converts the property of magnetic fluid to absorb electromagnetic waves, which could be considered a blocking effect, into a beneficial detection mechanism. The absorption of electromagnetic waves by the magnetic fluid creates a detectable signal that indicates touch position, thereby converting what might be seen as an obstacle into the core detection principle
3Measurement precision
If RGB value analysis of captured images is used to detect touch, then touch position is identified, but the system fails in dark rooms or low-illumination environments
Solution Approach 1:
The patent changes the detection approach from analyzing reflected light (RGB values) to detecting electromagnetic wave absorption. By using magnetic fluid that absorbs electromagnetic waves and observing the absorption pattern with a camera, the system can detect touches in low-illumination environments, as it relies on the absorption property rather than reflected light intensity
Solution Approach 2:
The patent introduces magnetic fluid as an intermediary substance between the touch interface and the detection camera. The magnetic fluid serves as the medium that converts touch input into detectable electromagnetic wave absorption patterns, enabling detection in various lighting conditions without relying on sufficient environmental light for RGB analysis
4Adaptability or versatility
If a flexible bag-shaped structure containing fluid is used, then the touch panel can be deformed to arbitrary shapes, but the stiffness and cushion properties cannot be adjusted in real time
Solution Approach 1:
The patent applies dynamics by making the magnetic fluid's properties controllable and adjustable in real time. By using a magnetic field to alter the magnetic fluid's state, the system can dynamically change the stiffness and cushion properties of the touch panel, transitioning from a static flexible structure to a dynamically adjustable one that can adapt its mechanical properties based on operational requirements
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 system achieves a simple device structure, insensitivity to ambient temperature and brightness, and real-time adjustability of stiffness and cushion properties, enabling reliable operation in diverse conditions, including low-illumination environments and with objects that do not emit heat.
Implementation Method 1
a magnetic fluid comprising a fluid that blocks or absorbs electromagnetic waves in the aforesaid wavelength range, and magnetic substance
Implementation Method 2
a magnetic field control mechanism for controlling the magnetic fluid by applying a magnetic field thereto
Data Source
AI summary
A touch panel system 1 includes: a touch panel body part V having a touch face 11 through which electromagnetic waves in the visible-light or near-infrared wavelength range transmit, and a counterface-side face 12 through which such electromagnetic waves transmit, wherein a space is provided between the touch face and the counterface-side face; a magnetic fluid 20 including a fluid blocking/absorbing such electromagnetic waves, and magnetic substance; a camera 50; an image analysis part 100; and a magnetic field control mechanism 24 for controlling the magnetic fluid by applying a magnetic field thereto. The camera captures, when an external force is applied to the touch face, the change in such electromagnetic waves resulting from the touch face and the counterface-side face coming closer in distance and the magnetic fluid moving from this distance-reduced location.