Rollable Screen Position Detection Using Magnetic Field Deforming Structure
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Solution Overview
Problem
Existing systems for automatically rolling up and unrolling rollable screens, such as sun protection screens, face challenges in being suitable for thin and flexible screens, and in directly detecting obstacles or the fully rolled-up/unrolled position without additional sensors.
Innovation Solution
A system that incorporates a magnetic field deforming structure on the rollable screen, paired with a coil assembly that generates and detects a magnetic field, allowing for precise control of the rolling up and unrolling process using a controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical detection methods are used to detect screen position, then position detection can be achieved, but the screen is weakened and damaged due to holes, and optical detectors are affected by dirt and dust in outdoor environments
Solution Approach 1:
The patent replaces optical detection systems with a magnetic field-based detection system. Instead of using optical detectors that require holes in the screen and are susceptible to dirt and dust, the invention uses a coil assembly that generates and detects magnetic fields interacted with by a magnetic field deforming structure on the screen. This substitution eliminates the need for optical components and holes in the screen, thereby maintaining screen integrity while achieving position detection.
2Measurement precision
If magnets are attached to the fabric to detect screen position, then position detection is possible, but the thick magnets form protrusions that are unsuitable for flexible screens
Solution Approach 1:
The patent changes the physical parameters of the magnetic detection element from thick magnets to a thin magnetic field deforming structure. This thin structure can be integrated into the flexible screen without creating protrusions, maintaining both the flexibility needed for rollable screens and the capability for position detection through magnetic field interaction.
3Reliability
If power measurement is used to detect obstacles, then obstacle detection is possible, but additional sensors are required
Solution Approach 1:
The patent makes the coil assembly multi-functional by enabling it to perform both position detection and obstacle detection functions. The same coil assembly that detects the magnetic field deforming structure for position determination also detects changes in magnetic field power that indicate obstacles. This eliminates the need for separate sensors for obstacle detection, reducing device complexity while maintaining reliable obstacle detection capability.
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 enables efficient, precise, and automated control of rollable screens, including detection of the fully rolled-up/unrolled position and potential obstacles, without the need for additional sensors, making it suitable for thin and flexible screens.
Implementation Method 1
at least one coil assembly for generating a magnetic field and for detecting the generated magnetic field
Implementation Method 2
the magnetic field detected by the coil assembly is dependent on the rolled-up and unrolled position of the rollable screen
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A system for automatically rolling up and unrolling a rollable screen (2), comprising: the rollable screen (2), comprising a magnetic field deforming structure (3), a rotatable tube (4) for rolling up and unrolling the rollable screen (2), a motor (5) for rotating the tube (4), at least one coil assembly (7) for generating a magnetic field and for detecting the generated magnetic field, arranged adjacent to a path along which the magnetic field deforming structure (3) travels when the rollable screen (2) is being rolled up and unrolled such that the magnetic field detected by the coil assembly (7) is dependent on the rolled-up and unrolled position of the rollable screen (2), and a controller (6) suitable for controlling the motor (5) based on the magnetic field detected by the coil assembly (7).