Imaging Device Shield Plate Grounding Structure
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Solution Overview
Problem
Existing imaging devices have insufficient structures to effectively shield against electromagnetic noise, which can affect other equipment components they are installed in.
Innovation Solution
The imaging device incorporates a shield plate made of metal, connected to a case and substrate at ground potential, with leaf springs ensuring reliable electrical contact and increased metallic area for noise resistance, and a connector unit for external grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield plate is added to shield against electromagnetic noise, then shielding performance is improved, but device complexity increases
Solution Approach 1:
The shield plate is integrated with the case structure, merging the shielding function into the existing housing. The case itself serves as both the structural enclosure and the ground potential reference, eliminating the need for a separate shield plate assembly while maintaining electromagnetic shielding effectiveness.
Solution Approach 2:
The case structure performs multiple functions simultaneously: it provides mechanical support, defines the device boundary, serves as the ground potential reference, and provides electromagnetic shielding. This multi-functionality reduces overall device complexity while achieving the shielding objective.
2Reliability
If the shield plate is rigidly fixed to the case, then electrical connection stability is improved, but adaptability to external impacts and vibrations deteriorates
Solution Approach 1:
The connection between the shield plate and case is made elastic rather than rigid, allowing the structure to dynamically adapt to external impacts and vibrations. The elastic material can deform under impact forces and return to its original state, maintaining electrical connection stability while improving shock resistance.
Solution Approach 2:
The elastic material in advance absorbs and cushions the impact forces before they can disrupt the electrical connection. This preemptive cushioning protects the rigid electrical connection components from damage during sudden impacts or vibrations.
3Reliability
If the metallic area for grounding is increased, then noise resistance is improved, but device complexity increases
Solution Approach 1:
The grounding function is merged with the case structure itself. The case serves as the ground potential reference, eliminating the need for separate grounding components and reducing overall structural complexity while providing extensive metallic area for noise resistance.
Solution Approach 2:
The case structure simultaneously provides mechanical support, defines the device boundary, serves as the ground potential reference, and provides electromagnetic shielding. This multi-functionality reduces overall device complexity while achieving the shielding objective.
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 provides enhanced shielding against electromagnetic noise, stabilizing the ground potential and making the circuit more resistant to power surges and external impacts.
Implementation Method 1
a first leaf spring (65a, 65b) elastically in contact with the case
Implementation Method 2
The shield plate (6) is in contact with the case (3, 7). The substrate includes a ground potential portion electrically connected (65a, 65b) to the shield plate and the case
Data Source
AI summary
An imaging device includes an imaging unit that captures an image of a subject, a substrate on which the imaging unit is mounted, a lens barrel holding a lens, a shield plate surrounding the substrate and including a metal, and a case accommodating the substrate, the lens barrel, and the shield plate and including a metal. The shield plate is in contact with the case. The substrate includes a ground potential portion electrically connected to the shield plate and the case.