Camera Module Shielding via Segmented Adhesive and Solder
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Solution Overview
Problem
The development of compact camera modules for portable terminals faces challenges such as resolution deterioration due to optical axis misalignment and electromagnetic interference (EMI) between the camera module and adjacent components like antennas, which affects image quality and performance.
Innovation Solution
A camera module design featuring a printed circuit board with a conductive member and a non-conductive adhesive layer, where the conductive member is electrically coupled to the ground portion through solder, providing improved rigidity, hardness, and electromagnetic shielding to prevent misalignment and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive adhesive layer is used to attach the conductive member to the printed circuit board, then electrical connection is achieved, but the camera module thickness increases and manufacturing precision deteriorates due to thickness deviation
Solution Approach 1:
The adhesive layer is segmented into two distinct functional layers: a non-conductive adhesive layer for mechanical attachment and a conductive adhesive layer for electrical connection. This segmentation allows each layer to be optimized independently, with the non-conductive layer providing precise positioning and the conductive layer ensuring electrical connectivity without compromising the other functions.
Solution Approach 2:
The non-conductive adhesive layer serves as an intermediary between the conductive member and the printed circuit board. It provides mechanical bonding and positioning while allowing the conductive adhesive layer to independently establish electrical connections through aligned openings, thereby controlling thickness deviation and improving manufacturing precision.
2Area of stationary object
If the camera module is disposed adjacent to the antenna in the portable terminal, then space is efficiently utilized, but electromagnetic interference occurs between the antenna and camera module
Solution Approach 1:
The conductive member acts as an intermediary shielding structure between the antenna and the camera module. It is electrically connected to the ground portion of the printed circuit board, creating a ground shield that blocks electromagnetic waves from the antenna from interfering with the camera module, while still allowing the components to be positioned adjacent to each other for space efficiency.
Solution Approach 2:
The conductive member, when connected to ground, converts the potentially harmful electromagnetic fields from the antenna into a beneficial shielding effect. The ground connection provides a reference potential that cancels out electromagnetic interference, transforming the proximity to the antenna from a harmful factor into an opportunity for compact design.
3Ease of manufacture
If the optical axis is misaligned between the image sensor and lens, then assembly flexibility is improved, but image resolution deteriorates
Solution Approach 1:
The non-conductive adhesive layer serves as a precise intermediary that maintains the relative position between the conductive member and the printed circuit board. By providing a stable bonding interface with controlled thickness, it ensures that the conductive member (and thus the image sensor) remains properly aligned with the lens optical axis during assembly, preventing misalignment while maintaining manufacturing flexibility.
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 solution enhances the camera module's resolution and electromagnetic susceptibility (EMS) by ensuring reliable mounting of the image sensor, maintaining image quality, and reducing the impact of external impacts, while also providing a slim form factor and improved electromagnetic wave shielding.
Implementation Method 1
The conductive member may be electrically coupled to the ground portion through a solder constructed on the first opening and the second opening
Data Source
AI summary
A printed circuit board of a camera module according to various embodiments of the disclosure includes: a ground portion constructed on the printed circuit board; a conductive member which is disposed to cover the ground portion and includes a first opening at a location corresponding to the ground portion; and an adhesive layer which is interposed between the printed circuit board and the conductive member and includes a second opening at a location corresponding to the ground portion, wherein the conductive member may be electrically coupled to the ground portion through a solder constructed on the first opening and the second opening. Other embodiments are also possible.