Shield-can with Anti-Reflection and Insulating Layers
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Solution Overview
Problem
Shield-cans used in mobile communications devices face issues with electromagnetic interference and light reflection, which can cause electronic components to malfunction and reduce light incidence on camera lenses, while traditional metal shields can lead to shorts due to solder contact and light interference.
Innovation Solution
A shield-can design featuring a metal plate with a circular through-hole and side walls, integrated with an anti-reflection layer on the upper surface and an insulating band-shaped layer on the side walls, preventing light reflection and shorts by ensuring electrical connectivity and reducing solder contact risks, along with a manufacturing jig that allows simultaneous formation of these layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal shield-can is used to block electromagnetic interference, then electromagnetic shielding is improved, but light reflection increases and light incidence on the lens decreases
Solution Approach 1:
The shield-can is segmented into multiple functional layers: a metal base layer for electromagnetic shielding, an insulating layer to prevent shorts, and an anti-reflection layer to reduce light reflection. This segmentation allows each layer to address specific issues independently while working together to solve the overall contradiction between shielding effectiveness and light transmission.
Solution Approach 2:
The shield-can employs composite material structure by combining metal material (for EMI shielding), insulating material (for electrical isolation), and anti-reflection coating material (for optical optimization). This composite approach enables the single component to simultaneously achieve electromagnetic shielding, electrical insulation, and optical performance.
2Object-affected harmful factors
If a metal shield-can is mounted on the camera module, then electromagnetic shielding is improved, but electrical shorts may occur due to contact between solder and the shield-can
Solution Approach 1:
An insulating layer is introduced as an intermediary between the metal shield-can and the circuit board/solder. This intermediate layer acts as a barrier that prevents direct electrical contact between conductive elements, thereby eliminating the risk of electrical shorts while maintaining the electromagnetic shielding function of the metal layer.
Solution Approach 2:
The insulating layer is applied specifically at locations where electrical contact risks exist (between the shield-can and solder/circuit board), rather than uniformly across the entire shield-can. This localized application of insulating property addresses the electrical short risk without compromising the overall electromagnetic shielding effectiveness.
3Reliability
If an insulating layer is formed on the entire inner surface of the shield-can, then electrical isolation is improved, but manufacturing complexity increases due to additional processing steps
Solution Approach 1:
The manufacturing jig serves multiple functions simultaneously: it holds the shield-can during processing, applies the insulating layer to specific regions, and prevents insulating material from entering areas where it is not needed. This multi-functionality of the jig simplifies the overall manufacturing process by combining several operations into a single tool and step.
Solution Approach 2:
The jig is pre-configured with structures (such as blocking portions or masking features) that define the exact regions where the insulating layer should be formed. This preliminary setup of the jig eliminates the need for complex multi-step masking or selective application processes, as the insulation pattern is predetermined by the jig design itself.
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
Enhances light incidence on camera lenses and reduces the occurrence of shorts during installation, while facilitating easy electrical connection and improving manufacturing yield by preventing insulating layer formation on the shield-can's bottom surface.
Implementation Method 1
an anti-reflection layer stacked on an upper surface of the plate
Implementation Method 2
an insulating layer stacked on an inner surface of any one side wall of the plurality of side walls and at edges of inner surfaces of side walls neighboring the any one side wall
Data Source
AI summary
There is provided a shield-can, including a plate including a circular through-hole formed therein for exposing a lens part, a plurality of side walls extended from edges of the plate and forming an inner space together with the plate, an anti-reflection layer stacked on an upper surface of the plate, and an insulating layer stacked on an inner surface of any one side wall of the plurality of side walls and at edges of inner surfaces of side walls neighboring the any one side wall, wherein the insulating layer has a band shape and is stacked on lower end portions of the inner surfaces of the side walls.