Imaging Apparatus Magnetic Shielding for Noise Reduction
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Solution Overview
Problem
Existing imaging apparatuses face challenges in reducing the magnetic field noise from coils, such as those in digital video cameras, which can disturb image quality due to the inability of ferromagnetic members to completely block magnetic flux, especially when two coils sandwich the imaging element.
Innovation Solution
An imaging apparatus design featuring a magnetic member with first and second magnetic portions arranged between the coils and the imaging element, connected by a third magnetic portion, which faces the magnetic cores of the coils, effectively bypassing and reducing the leakage magnetic field by creating magnetic transfer routes that divert the field away from the imaging element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ferromagnetic member is arranged between the coil and the imaging element to reduce magnetic flux arrival, then the magnetic field noise is reduced, but the ferromagnetic member approaches the imaging element and magnetic flux leakage increases
Solution Approach 1:
The magnetic member is divided into multiple magnetic portions (first magnetic portion, second magnetic portion, third magnetic portion) that are arranged at different positions. Each portion handles magnetic flux from different directions, creating a segmented shield that reduces magnetic noise while maintaining distance from the imaging element.
Solution Approach 2:
The magnetic member acts as an intermediary between the coil and the imaging element, providing a dedicated magnetic flux pathway that prevents direct magnetic flux arrival at the imaging element while avoiding the need for the member to approach the sensor.
2Quantity of substance
If two coils are arranged to sandwich the imaging element, then the structure is compact, but magnetic field noise from both coils affects the imaging element
Solution Approach 1:
The magnetic member is segmented into multiple portions that correspond to different coil positions. The first magnetic portion handles flux from one coil, the second magnetic portion handles flux from the other coil, and the third magnetic portion connects them, creating a comprehensive shield against multi-directional magnetic noise.
Solution Approach 2:
Different magnetic portions are positioned to address local magnetic field conditions. The first and second magnetic portions are placed near respective coils to handle local flux, while the third magnetic portion provides connectivity, creating locally optimized protection throughout the structure.
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 significantly reduces the arrival amount of magnetic field noise at the imaging element, minimizing image disturbances and improving image quality even when coils are positioned near the imaging element.
Implementation Method 1
the ferromagnetic member becomes a detour of a magnetic flux to the imaging element and an arrival amount of the magnetic flux generated from the coil which arrives at the imaging element is reduced
Implementation Method 2
a ferromagnetic member made of a ferromagnetic material having a high relative permeability such as Permalloy or the like is arranged between the coil and the imaging element
Data Source
AI summary
An imaging apparatus includes a first magnetic core and a first coil wound around the first magnetic core, a second magnetic core and a second coil wound around the second magnetic core, an imaging element provided between the first coil and the second coil, and a magnetic member, wherein the magnetic member includes a first magnetic portion arranged between the first coil and one surface serving as a light-receiving surface side of the imaging element, a second magnetic portion arranged between the second coil and the other surface side opposite to the light-receiving surface side of the imaging element, and a third magnetic portion which connects the first magnetic portion and the second magnetic portion, and wherein the first magnetic portion is arranged so as to face the first magnetic core, and/or the second magnetic portion is arranged so as to face the second magnetic core.