Optical Sensor EMI Shield Structure for Crosstalk and Leakage Control
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Solution Overview
Problem
Conventional EMI shields for optical sensors face challenges such as increased component and assembly costs, larger footprints due to rounded corners, and reduced effectiveness against higher frequency EM waves, along with internal crosstalk and gaps in multi-can shielding, and insufficient performance in thin packaging.
Innovation Solution
The use of localized conductive envelopments formed by EMI shields around electrical components, with protrusions and apertures, and integrated into device packaging, providing effective shielding while reducing material and assembly costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple metal cans are used to reduce footprint, then the footprint of the EMI shield is reduced, but gaps are introduced through which EM waves may leak
Solution Approach 1:
The patent merges multiple separate EMI shielding functions into a single integrated EMI shield structure with multiple chambers. Instead of using multiple separate metal cans that create gaps at interfaces, the invention provides one continuous conductive envelope with internal partitions that separates different components while maintaining overall shielding integrity and preventing EM wave leakage.
2Ease of manufacture
If conventional stamping fabrication techniques are used, then metal cans can be fabricated, but corners must have wide radius which increases footprint
Solution Approach 1:
The patent changes the geometric parameters of the EMI shield by incorporating sharp corners and right-angle features that are impossible to achieve with conventional stamping fabrication. This allows the shield to achieve minimal footprint without the need for rounded corners, thereby reducing the overall area occupied by the shielding structure.
3Object-affected harmful factors
If EMI shield is introduced into packaging of optical sensor, then EMI shielding is provided, but internal EMI crosstalk between electrical components within the same EMI shield occurs
Solution Approach 1:
The patent segments the internal space of the EMI shield into multiple separate chambers using internal partitions or walls. Each electrical component is housed in its own isolated chamber, preventing electromagnetic interference between components while the outer EMI shield provides protection against external electromagnetic fields.
4Object-generated harmful factors
If multiple EMI shields are used to isolate electrical components, then internal EMI crosstalk is reduced, but material costs and assembly complexity increase
Solution Approach 1:
The patent combines multiple EMI shielding functions into a single integrated structure that provides both external shielding and internal component isolation. The EMI shield serves dual purposes: protecting against external electromagnetic interference while simultaneously separating internal components through integrated partitions, thereby eliminating the need for multiple separate shields.
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 EMI shielding performance, reduces material costs, and optimizes space efficiency by using EMI shields as both shielding and spacers, minimizing internal interference and leakage.
Implementation Method 1
EMI shielding creates a Faraday cage effect which attenuates radiation of electromagnetic (EM) waves
Implementation Method 2
a lens coupled to the first EMI shield, wherein the lens is positioned above the first electrical component, and wherein the lens is substantially aligned with the first aperture
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Methods, systems, and apparatuses for electromagnetic interference (EMI) shielding are provided. An apparatus comprises a plurality of electrical components coupled to a substrate. The plurality of electrical components comprises a first electrical component coupled to a first region of the substrate and at least one other electrical component coupled to at least one other region of the substrate. The first electrical component is configured to emit electromagnetic waves. The apparatus also comprises an EMI shield forming a conductive envelopment around the first region. The first electrical component is inside the conductive envelopment and the one other electrical component is outside of the conductive envelopment. The EMI shield comprises an aperture positioned above the first electrical component. The apparatus further comprises a lens coupled to the EMI shield. The lens is positioned above the first electrical component and is substantially aligned with the aperture.