Optical Sensor Module Metal Shielding EMI Leakage Reduction
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Solution Overview
Problem
Optical sensor modules face challenges with electromagnetic interference (EMI) issues between the sensor module and host devices, particularly in consumer electronics, which can affect the accuracy and reliability of object detection and distance measurement.
Innovation Solution
The implementation of a substrate assembly for an optical sensor module that includes a light-emitting device mounted on a substrate with a metal shielding assembly. The metal shielding has a first opening for the optical path and is dimensioned to surround and partially cover the light-emitting device, with an absorber layer to enhance EMI protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal shielding assembly is added to reduce EMI, then EMI shielding is improved, but device complexity increases
Solution Approach 1:
The light-emitting device is nested inside the metal shielding assembly, with the device positioned within the enclosed space formed by the shielding structure. This integration allows the shielding to protect the device while maintaining a compact form factor.
Solution Approach 2:
The metal shielding assembly is prepared with a pre-formed opening before the light-emitting device is installed. This preliminary configuration of the opening simplifies the assembly process and reduces the complexity of post-installation modifications.
2Ease of operation
If an opening is created in the metal shielding for optical path, then optical function is improved, but EMI shielding deteriorates
Solution Approach 1:
The metal shielding assembly features a localized opening specifically positioned and sized to allow optical transmission while maintaining EMI shielding in other areas. The opening's dimensions and location are optimized to balance optical functionality with electromagnetic protection.
Solution Approach 2:
The opening in the metal shielding is designed with dimensions that are sufficient for optical transmission but not excessively large, thereby providing partial EMI shielding while maintaining necessary optical function. This balanced approach prevents complete EMI exposure while ensuring optical performance.
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 solution effectively reduces EMI leakage and enhances EMI shielding, preventing interference that could alter the functioning of optical sensor module components and ensuring accurate object detection and distance measurement.
Implementation Method 1
a metal shielding assembly comprising a first metal shielding assembled to the substrate over the first region
Implementation Method 2
with an absorber layer to enhance EMI protection
Implementation Method 3
a first opening providing an optical path for light emitted by the light-emitting device
Data Source
AI summary
The present disclosure provides a substrate assembly for an optical sensor module. An example substrate assembly for an optical sensor module comprising: a light-emitting device mounted on a first region of a substrate; a metal shielding assembly comprising a first metal shielding assembled to the substrate over the first region; and wherein the first metal shielding comprises a first opening providing an optical path for light emitted by the light-emitting device, the first opening being dimensioned such that the light-emitting device can be inserted through the first opening inside the first metal shielding.