Camera Module Feeding Coil Integration for Antenna Shielding
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Solution Overview
Problem
In portable electronic devices with metal housings, the HF band antenna coil is often shielded, leading to communication failures or reduced communication distances due to misalignment between the feeding coil and the camera module, which complicates achieving stable communication characteristics.
Innovation Solution
Integrating the feeding coil into the camera module, positioning it between the image sensor and lens along the optical axis, and connecting it to a feeding circuit, allows for stable electromagnetic field coupling with the metal housing, reducing misalignment issues and enhancing communication characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feeding coil is placed separately from the camera module to avoid shielding, then communication can be achieved, but misalignment occurs between the feeding coil and camera module, degrading communication characteristics
Solution Approach 1:
The patent merges the feeding coil with the camera module by integrating it into the lens holder structure. The feeding coil is wound around the optical axis of the lens within the lens holder, ensuring that the feeding coil and camera module move together as a single unit, thereby eliminating relative position misalignment while maintaining effective electromagnetic coupling with the metal housing.
Solution Approach 2:
The lens holder serves as an intermediary structure that accommodates both the lens and the feeding coil. By integrating the feeding coil into the lens holder, the patent creates a stable mechanical relationship between the feeding coil and the camera module, ensuring consistent positioning without requiring separate mounting structures.
2Reliability
If the feeding coil is integrated into the camera module, then misalignment is reduced, but the space between lens and image sensor must be utilized
Solution Approach 1:
The patent utilizes the optical axis dimension (z-direction) of the lens to position the feeding coil. Instead of placing the feeding coil in the lateral plane, it is wound around the optical axis, effectively using the vertical space between the lens and image sensor. This dimensional approach allows integration without increasing the lateral footprint of the camera module.
Solution Approach 2:
The feeding coil is nested within the lens holder structure, which itself is part of the camera module assembly. The coil is wound around the optical axis, fitting within the existing structural envelope of the lens holder, thereby integrating an additional component without significantly increasing the overall volume.
3Adaptability or versatility
If the metal housing is used as radiating element with opening for camera lens, then antenna function is achieved, but HF band antenna coil is shielded causing communication failures
Solution Approach 1:
The patent extracts the feeding coil from the traditional separate antenna mounting location and integrates it directly into the camera module. This extraction allows the metal housing to serve purely as the radiating element without requiring a separate coil, eliminating the shielding problem while maintaining communication functionality.
Solution Approach 2:
The patent makes the metal housing serve multiple functions: it acts as both the structural housing and the radiating element for HF band communication. By integrating the feeding coil into the camera module, the housing can be used as the antenna without requiring separate antenna components, achieving multi-functionality.
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 ensures stable communication characteristics by minimizing misalignment and optimizing electromagnetic field coupling, allowing the metal housing to function effectively as a radiating element for wireless communication.
Implementation Method 1
the feeding coil and the opening in the metal housing (i.e., three points) need to be aligned, it is difficult to improve accuracy in the relative position of the camera module and the feeding coil
Implementation Method 2
the metal housing is used as a radiating element for communication
Data Source
AI summary
A camera module includes a lens and an image sensor that converts an image formed by the lens into an electrical signal. The camera module is disposed such that the lens is exposed from an opening in a metal housing. A feeding coil to which a feeding circuit is directly or indirectly connected, is disposed, for example, in a space between the image sensor and the lens in a direction of an optical axis of the lens. The feeding coil is coupled to the metal housing by a magnetic field, so that the metal housing defines and functions as a radiating element for communication.