Magnetic Field Sensor Package Perpendicular Conductive Line
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Solution Overview
Problem
Existing MEMS magnetic field sensors face challenges in detecting magnetic fields due to the relatively small Lorentz force, which limits mechanical displacement and sensitivity, and the arrangement of conductive lines and sensors in the same package can lead to unstable output values and reduced sensitivity.
Innovation Solution
A magnetic field sensor package design where the conductive line generating the magnetic field is positioned perpendicularly to the sensor assembly, minimizing the distance between the conductive line and the sensor and optimizing the arrangement to enhance the magnetic field intensity and stability, thereby improving sensitivity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the conductive line is arranged vertically parallel to the sensor assembly, then the magnetic field intensity is increased, but the Lorentz force is applied in vertical direction causing reduced or abnormal displacement of the sensor assembly
Solution Approach 1:
The patent applies asymmetry by changing the relative orientation between the conductive line and sensor assembly from vertical parallel to horizontal parallel arrangement. This asymmetric repositioning ensures that the magnetic field lines generated by the conductive line are perpendicular to the sensor assembly surface, causing Lorentz force to act in the horizontal direction (parallel to sensor displacement) rather than vertical direction, thereby resolving the contradiction between magnetic field intensity and measurement precision
Solution Approach 2:
The patent utilizes dimensionality change by transitioning the conductive line-sensor assembly relationship from a vertical configuration to a horizontal configuration. This spatial re arrangement in another dimension (orientation angle) allows the magnetic field to effectively drive sensor displacement while maintaining stability, converting the harmful vertical Lorentz force into a useful horizontal force component
2Length of moving object
If the distance between the conductor and the sensor is increased, then the mechanical displacement is sufficient, but the sensitivity of the magnetic field detection is decreased
Solution Approach 1:
The patent applies parameter changes by optimizing the distance parameter between the conductive line and sensor assembly to a specific optimal value. This parameter optimization ensures that the magnetic field intensity is sufficient to generate adequate Lorentz force for sensor displacement while maintaining high sensitivity for accurate magnetic field detection, resolving the contradiction between displacement magnitude and detection sensitivity
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 design enhances the sensitivity and resolution of the magnetic field sensor by maximizing the Lorentz force displacement and maintaining a stable output value, even under varying conditions, by concentrating the Lorentz force in the horizontal direction and minimizing external magnetic field interference.
Implementation Method 1
a conductive line provided in the space of the package body to allow current to be measured to flow and generating a magnetic field
Implementation Method 2
the driving is moved from the fixing electrode in a positive or negative direction due to the Lorentz force based on the direction and the intensity of an external magnetic field
Implementation Method 3
the variation in the distance between two electrodes or the overlap area between the two electrodes is made to vary the capacitance. The variation of the capacitance or the signal varied corresponding to the variation of the capacitance is detected to sense the magnetic field
Data Source
AI summary
A magnetic field sensor package according to an embodiment includes: a package body; a magnetic field sensor disposed on top of the package body and including a sensor assembly in which a displacement is generated by a magnetic field; and a conductive line formed on the package body, which is for making current to be measured flow and generating a magnetic field for displacing the sensor assembly, wherein the conductive line generates a magnetic field applied in a perpendicular direction to the sensor assembly.