Magnetic Extension Member for Longer-Range Hall Sensor Detection
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Solution Overview
Problem
Existing case designs using Hall Effect sensors for proximity detection face limitations due to rapid magnetic field drop-off with distance and require additional components like IR sensors, which consume more power and need a window for operation, compromising compactness and efficiency.
Innovation Solution
An extension member is used to transfer the magnetic field from a magnet to a Hall Effect sensor, allowing for more design flexibility and reducing the need for additional sensors, while providing a holding force without a second magnet, and protecting the sensor from environmental contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a Hall Effect sensor is used for proximity detection, then power consumption is reduced compared to IR sensors, but magnetic field strength drops off quickly with distance limiting detection range
Solution Approach 1:
A magnetic extension member is introduced as an intermediary between the magnet and the Hall Effect sensor. This extension member transfers the magnetic field from the magnet to the sensor, effectively extending the detection range while maintaining the low power consumption characteristics of the Hall Effect sensor configuration.
2Length of moving object
If additional components like IR sensors are used to extend detection range, then detection range is improved, but device complexity and power consumption increase
Solution Approach 1:
The magnetic extension member serves as a passive intermediary that extends the magnetic field reach without requiring additional active sensing components. This approach increases detection range while avoiding the added complexity and power consumption associated with multiple sensor types.
3Measurement precision
If the Hall Effect sensor is positioned closer to the magnet to improve detection, then detection sensitivity is improved, but design flexibility is reduced due to space constraints
Solution Approach 1:
The magnetic extension member acts as a flux conduit that allows the sensor to be positioned at optimal locations for design and assembly considerations. By transferring the magnetic field over distance, the system maintains high detection sensitivity while providing the design flexibility to place components where they are most effective.
Solution Approach 2:
The magnetic coupling system is segmented into three distinct components: the magnet in the first cover, the magnetic extension member, and the Hall Effect sensor in the second cover. This segmentation allows each component to be optimized independently and positioned optimally within the case structure.
4Length of moving object
If magnetic field strength is increased to extend detection range, then detection range is improved, but unwanted responses to noise increase
Solution Approach 1:
The magnetic extension member provides a dedicated flux pathway that guides the magnetic field from the magnet to the sensor. This focused flux transfer enhances the signal strength at the sensor while the physical structure of the extension member helps filter out stray magnetic fields and noise, improving signal-to-noise ratio.
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 enhances the sensitivity and reliability of Hall Effect sensors by extending the magnetic field reach, reduces power consumption, and prevents unwanted responses to noise, while maintaining compactness and extending the sensor's lifespan.
Implementation Method 1
an elongated body extending between the first end and the second end, the elongated body being formed from a material capable of transferring a magnetic field of the magnet from the first end to the second end
Implementation Method 2
Hall Effect sensors, e.g., Hall Effect sensors, may be used to detect whether the case is open or closed by proximity detection
Data Source
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AI summary
The technology provides for an extension member 110 configured to direct a magnetic field from a magnet (120) to a Hall Effect sensor (130) to facilitate detection of magnetic field. By varying the dimensions of the extension member (110), which may be any arbitrary shape, the relative positions of the magnet (120) and the Hall Effect sensor (130) may be less constrained by the reach of the magnetic field of the magnet (120), thereby allowing more design possibilities. The extension member (110) may be used in a case (800), where the extension member (110) may facilitate detection of whether the case (800) is open or closed, the extension member (110) may further provide magnetic attraction to keep the case (800) closed.