Lens Barrel Coil Layout for Image Sensor Magnetic Noise Shielding
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Solution Overview
Problem
In imaging apparatuses, magnetic field noise from electronic components such as transformers and conductors causes disturbances in captured images, particularly due to the inability of existing coil components to fully shield magnetic flux leaking in all directions.
Innovation Solution
A coil component design featuring a winding portion and core portion with asymmetrically located winding core portions and magnetic outer walls, where the number of turns around the core portions differs, and the core portion covers the winding portion except for the mounting surface, effectively cancels out magnetic flux reaching the image sensor by positioning the core with fewer turns closer to the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a plate-like core is used to shield magnetic flux, then magnetic flux leaking in one direction is reduced, but magnetic flux leaking in other directions cannot be fully reduced
Solution Approach 1:
The core is divided into multiple segments (first core, second core, third core) arranged in different orientations. Each segment shields magnetic flux in specific directions, collectively providing comprehensive shielding coverage that a single plate-like core cannot achieve.
Solution Approach 2:
Different core segments are positioned at specific locations around the winding portion to address magnetic flux leakage in different directions. The first core shields in one direction, the second core in another direction, and the third core provides additional shielding, creating localized shielding quality tailored to each direction's requirements.
2Object-affected harmful factors
If the number of turns around different core portions is made asymmetric, then magnetic flux cancellation is improved, but manufacturing complexity increases
Solution Approach 1:
The coil component employs asymmetric winding configurations where the number of turns around the first core differs from the number of turns around the second core. This asymmetry creates unequal magnetic flux generation that actively cancels out leaked magnetic flux, reducing magnetic field noise more effectively than symmetric configurations.
Solution Approach 2:
The invention converts the potentially harmful leaked magnetic flux into a beneficial effect by using asymmetric windings to generate counter-directional magnetic flux. The leaked flux is canceled out by the deliberately designed asymmetric magnetic field, transforming a harmful factor into a solution.
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 significantly reduces magnetic field noise reaching the image sensor, thereby improving the quality of captured images by minimizing magnetic flux components in both X and Z directions.
Implementation Method 1
the core portion includes a first winding core portion and a second winding core portion located with a gap therebetween in an axial direction in which the first and second winding core portions extend, around which the winding portion is wound
Implementation Method 2
a number of turns of the winding portion around the first winding core portion is smaller than a number of turns of the winding portion around the second winding core portion
Implementation Method 3
a first magnetic outer wall located in the axial direction and configured to hold the first winding core portion, a second magnetic outer wall located in the axial direction and configured to hold the second winding core portion
Data Source
AI summary
A lens barrel includes a printed-wiring board located on an outside of a lens as viewed in a first direction in which an optical axis of the lens extends and including a first principal surface on an object side, and a coil component including a winding portion and a core portion and mounted on the first principal surface of the printed-wiring board. The core portion includes first and second winding core portions with a gap therebetween in an axial direction in which the first and second winding core portions extend, around which the winding portion is wound. A number of turns of the winding portion around the first winding core portion is smaller than a number of turns of the winding portion around the second winding core portion. The first winding core portion is located on a side closer to an optical axis than the second winding core portion.