Cross-Shaped Hall Effect Sensor Electrode Segmentation
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Solution Overview
Problem
Hall effect sensors face limitations in sensitivity when detecting magnetic fields due to the arrangement of electrodes, which affects their ability to accurately measure magnetic field strength and movement.
Innovation Solution
A symmetric cross-shaped Hall effect sensor design with multiple electrodes on the fingers of plural arms, allowing for improved sensitivity by optimizing the placement and orientation of electrodes to enhance the detection of magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple electrodes are provided on plural arms of the Hall effect sensor, then sensitivity to magnetic field detection is improved, but device complexity increases
Solution Approach 1:
The Hall effect sensor is divided into multiple arms (first pair and second pair of opposing arms) with multiple electrodes on each arm. This segmentation allows the sensor to detect magnetic fields from multiple directions and positions simultaneously, improving sensitivity and measurement precision without requiring a single complex electrode structure.
Solution Approach 2:
The patent extends the electrode arrangement from a single plane to a three-dimensional configuration with arms extending in multiple directions from a central body. This dimensional expansion allows magnetic field detection along multiple axes, enhancing sensitivity while distributing the complexity across multiple simpler arm structures rather than one complex electrode.
2Measurement precision
If multiple electrodes are spaced on arms to improve sensitivity, then measurement precision increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs symmetric arm structures extending from a central body, which simplifies manufacturing by allowing repeated use of the same structural template for each arm. The symmetry reduces the need for high-precision custom positioning of each electrode, as the repeated arm patterns can be manufactured with standard tolerances and then aligned during assembly.
Solution Approach 2:
Each arm structure serves multiple functions: it provides mechanical support, defines electrode positioning, and acts as a current path. This multi-functionality reduces the number of separate manufacturing steps and precision requirements, as the arm structure itself rather than separate positioning fixtures determines electrode placement accuracy.
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 design enhances the sensitivity and accuracy of magnetic field detection, enabling precise measurement of magnetic field strength and movement, and reduces noise by separating bias and sensing electrodes.
Implementation Method 1
Hall effect sensor and system with improved sensitivity
Data Source
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AI summary
A Hall effect sensor system for detecting magnetic fields includes a Hall effect sensor having a central body with a substantially square shape, a first pair of outwardly oriented and opposing arms projecting outwardly from opposing sides of the central body and a second pair of outwardly oriented and opposing arms projecting outwardly transverse from the first pair of arms to form a cross-shape. Each of the arms has a plurality of fingers projecting outwardly therefrom and electrodes are provided on the fingers. In operation, at least two electrodes on the first pair of opposing arms provide a path for bias current through the Hall effect sensor. An electrode on each of the second pair of opposing arms senses voltage formed in the Hall effect sensor by a magnetic field and provides an output to an amplifier.