Magnetic Sensor Bobbin Layout for Shared PCB Component Space
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Solution Overview
Problem
Magnetic sensors utilizing a large Barkhausen effect face challenges in size reduction, leading to increased occupancy of the substrate area, which limits the space available for other electrical and electronic components.
Innovation Solution
The magnetic sensor design incorporates a bobbin with columnar support portions that protrude from the ends, allowing for a component placement space between the coil and the substrate, thereby increasing the area for other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic sensor is mounted on the substrate, then the sensor functionality is achieved, but the occupancy area of the substrate increases, limiting space for other components
Solution Approach 1:
The bobbin structure transitions from a flat two-dimensional mounting to a three-dimensional configuration with columnar support portions protruding in the vertical direction. This dimensional change creates unused vertical space that can be utilized for component placement, effectively adding another dimension (height/depth) to the substrate area utilization without compromising the sensor's planar footprint.
Solution Approach 2:
The columnar support portions of the bobbin structure are designed to protrude downward and receive other electronic components within their hollow interiors or alongside them. This nesting arrangement allows multiple components to occupy the same vertical space, effectively increasing the usable substrate area by utilizing the vertical dimension and creating a nested configuration where components are housed within or alongside the bobbin structure.
2Ease of manufacture
If the coil is wound on the outer periphery of the magnetic wire rod, then the sensor structure is formed, but the overall size increases, making millimeter-range reduction difficult
Solution Approach 1:
The bobbin structure is divided into distinct functional segments: the wire winding portion that holds the coil, and the columnar support portions that provide mounting functionality. This segmentation allows the coil-winding function to be concentrated in a compact cylindrical region while the support portions extend vertically to provide mounting capability, effectively separating the volumetric requirements of different functions and enabling more compact overall dimensions.
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 configuration enables a larger area on the substrate for components other than the magnetic sensor, enhancing the overall packaging efficiency without compromising the sensor's performance.
Implementation Method 1
A magnetic sensor that utilizes a large Barkhausen effect comprises a magnetic wire rod that generates a large Barkhausen effect... the magnetic wire rod has a property whereby the direction of magnetization of said magnetic wire rod is abruptly reversed in response to changes in the direction of an external magnetic field
Implementation Method 2
The abrupt reversals of the direction of magnetization of the magnetic wire rod generate a current pulse in the coil
Data Source
AI summary
The magnetic sensor comprises a magnetic wire rod that generates a large Barkhausen effect, a coil, and a bobbin; the bobbin has a wire winding portion in whose interior the magnetic wire rod is disposed and on whose outer peripheral portion the coil is provided, and a pair of columnar support portions respectively provided in the sections at opposite ends of the wire winding portion; the pair of columnar support portions protrude downwardly from the respective sections at opposite ends of the wire winding portion; and the amount of protrusion thereof is configured such that, once the magnetic sensor is mounted to the substrate, a component placement space allowing for placement of components is formed between the section on the outer peripheral surface of the coil facing the component-carrying surface and the component-carrying surface itself.