Vehicular Camera Shield Structure for EMI Control and Low-Cost Assembly
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Solution Overview
Problem
Existing vehicular cameras face challenges in achieving high imaging performance while maintaining low manufacturing costs, and they struggle with electromagnetic interference (EMI) shielding.
Innovation Solution
The proposed vehicular camera design includes a lens unit with a flange portion and a ring member made of specific resins for light transmissivity and absorptivity, which are welded to the housing using ribs to ensure reliable assembly and EMI shielding. Additionally, a metal shield is used to surround the circuit board, and a second shield is positioned to face the first surface of the circuit board, forming an electrically closed space to enhance shielding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal housing is used to provide EMI shielding, then electromagnetic interference shielding performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses a composite structure combining resin housing with metal shields and EMI shielding materials. The housing includes a resin main body with integrated EMI shielding layers, and metal shields positioned at critical locations. This composite approach achieves metal-level EMI shielding performance while maintaining the cost and manufacturing advantages of resin materials.
Solution Approach 2:
The patent applies EMI shielding measures locally rather than throughout the entire housing. Metal shields are positioned specifically around the circuit board and image sensor, and EMI shielding materials are applied to internal surfaces where shielding is most needed. This localized approach reduces material costs while maintaining effective EMI protection.
2Ease of manufacture
If resin materials are used for housing, then manufacturing cost is reduced, but EMI shielding performance deteriorates
Solution Approach 1:
The patent combines resin housing with EMI shielding materials and metal shields to create a composite structure that achieves the low cost of resin while obtaining the EMI shielding performance of metal. The resin housing serves as the base structure, augmented with shielding layers and metal components at critical locations.
Solution Approach 2:
The patent introduces EMI shielding materials as intermediary layers between the resin housing and the electronic components. These shielding layers act as mediators that block electromagnetic interference while allowing the resin housing to maintain its cost and manufacturing advantages.
3Reliability
If multiple welding ribs are added to ensure reliable assembly, then assembly reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the welding ribs structure. The ribs serve both as mechanical connection elements for assembly and as integrated EMI shielding barriers. By combining these functions into a single structural feature, the patent improves assembly reliability without proportionally increasing device complexity.
Solution Approach 2:
The welding ribs are designed to perform multiple functions: mechanical joining of components, structural support, and EMI shielding. This multi-functionality reduces the need for separate components, maintaining simplicity while achieving reliable assembly and effective shielding.
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 design achieves excellent imaging performance while maintaining low manufacturing costs, and it effectively shields against electromagnetic interference, comparable to metal-housed cameras.
Implementation Method 1
a ring member made of a first resin having predetermined light transmissivity
Implementation Method 2
the second resin material has a first light absorptivity... the third resin material has a second light absorptivity
Implementation Method 3
the second resin material has a first light absorptivity... the third resin material has a second light absorptivity
Implementation Method 4
the ring member is welded to the first welding rib on the second surface of the flange portion of the lens unit, and is welded to the second welding rib on the end surface of the second tubular portion of the housing
Data Source
AI summary
A vehicular camera includes a first shield made of metal and disposed to surround a circuit board. The first shield includes a first bottom surface portion, a second bottom surface portion disposed to be separated from the first bottom surface portion, and a connection portion connecting an entire periphery of the first bottom surface portion and an entire periphery of the second bottom surface portion. At least a first side surface portion, a second side surface portion, a third side surface portion, and a fourth side surface portion of the first shield are formed by a contiguously curved surface, and at least the first side surface portion, the second side surface portion, the third side surface portion, the fourth side surface portion, the first bottom surface portion, the connection portion, and the second bottom surface portion are formed by a contiguously curved surface.