Camera Module Shielding via Conductive Housing and Loop
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Solution Overview
Problem
The existing camera modules with metal shields face challenges in effectively shielding from electromagnetic interference while avoiding short circuits and maintaining a compact size, leading to complex manufacturing processes and higher costs.
Innovation Solution
A shield structure comprising a conductive housing, a conductive loop, and a closed ground loop, with a conducting resin layer and adhesive layers to prevent contamination and short circuits, and an in-mold injection process for the conductive loop to reduce size and enhance mechanical strength, effectively shielding the camera module from electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal shield is soldered on the circuit board to shield the camera module from electromagnetic interference, then the shielding effectiveness is improved, but the device complexity and manufacturing cost increase due to the need to avoid short circuits between shield pins and solders
Solution Approach 1:
The patent combines the shielding function with the housing structure itself. The housing is made of conductive material and forms an integrated shield without requiring separate metal shields or soldering operations. The housing structure serves both mechanical support and electromagnetic shielding purposes, eliminating the need for additional shielding components and complex assembly processes.
Solution Approach 2:
The housing structure performs multiple functions: it provides mechanical support, contains internal components, and simultaneously acts as an electromagnetic shield. By making the housing conductive and designing it to form a continuous shielding enclosure, the same structural element fulfills both structural and electromagnetic protection roles, simplifying the overall device architecture.
2Object-affected harmful factors
If a metal shield is installed on the camera module to provide comprehensive shielding, then the electromagnetic interference protection is improved, but the size of the camera module increases
Solution Approach 1:
The shielding function is merged into the existing housing structure rather than being added as a separate component. The housing itself is designed to be conductive and form a continuous shielding enclosure, eliminating the need for additional space-consuming metal shields and reducing the overall camera module size.
3Reliability
If pins of the metal shield avoid solders of the circuit board to prevent short circuits, then the reliability is improved, but the manufacturing process becomes more complicated and costly
Solution Approach 1:
The patent extracts the shielding function from separate metal shields with pins that require careful positioning to avoid solders. Instead, the housing structure itself provides shielding through its conductive material and continuous enclosure design, eliminating the need for pin-based connections and associated short circuit risks.
Solution Approach 2:
The shielding function is combined with the housing structure, eliminating the need for separate shield components with pins. The housing provides both mechanical support and electromagnetic shielding through its conductive construction, simplifying manufacturing by removing complex alignment and assembly requirements for shield pins.
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 proposed solution provides comprehensive shielding from electromagnetic interference, reduces the camera module's size, and lowers manufacturing costs by avoiding soldering and ensuring mechanical reinforcement, thus enhancing the module's performance and efficiency.
Implementation Method 1
a conducting resin layer and adhesive layers to prevent contamination and short circuits
Implementation Method 2
A shield structure comprising a conductive housing, a conductive loop, and a closed ground loop, with a conducting resin layer and adhesive layers to prevent contamination and short circuits, effectively shielding the camera module from electromagnetic interference
Data Source
AI summary
A camera module shielded against electromagnetic interference but of reduced size comprises a voice coil motor, a circuit board, and a base between voice coil motor and circuit board. The voice coil motor comprises conductive housing. The circuit board comprises a conductive wire itself comprising shielded wire, ground pad, and a surrounding and grounded closed ground loop. The base comprises a main body and a conductive loop sleeved thereon. A first side of the conductive loop is electrically connected to the conductive housing, a second side of the conductive loop is electrically connected to the closed ground loop. The conductive housing, the conductive loop, and the closed ground loop form a shield against electromagnetic interference. The disclosure further provides an electronic device including the camera module.