Shielded Light Source Layout for Noise Current Isolation
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Solution Overview
Problem
Existing light-source apparatuses suffer from noise current issues, where noise currents from the light-source chip drive circuit flow to other circuits and electronic components, causing malfunctions.
Innovation Solution
The light-source apparatus includes a light-source chip, a case, a substrate, an electromagnetic shield plate, an electrically-conductive layer, and an electrically-conductive unit, where the electrically-conductive parts and unit are connected to redirect and increase noise current through the shield plate and layer, thereby suppressing noise current flow to other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light-source chip drive circuit is mounted on the substrate, then the light-source apparatus can operate, but noise currents flow to other circuits and electronic components causing malfunctions
Solution Approach 1:
The substrate surface is divided into a first region for mounting the light-source chip drive circuit and a second region for mounting other circuits and electronic components. This spatial segmentation isolates the noise-generating circuit from sensitive circuits, preventing noise current interference while maintaining operational reliability.
2Object-affected harmful factors
If electromagnetic shielding is added to suppress noise current, then noise interference is reduced, but device complexity increases
Solution Approach 1:
The light-source chip drive circuit is extracted and mounted separately in a first region on the substrate, isolated from other circuits and electronic components mounted in a second region. This extraction eliminates the need for complex electromagnetic shielding structures while effectively suppressing noise current interference through spatial separation.
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 effectively suppresses noise current and prevents malfunctions in other circuits and electronic components, ensuring reliable operation of the light-source apparatus.
Implementation Method 1
an electromagnetic shield plate, an electrically-conductive layer and an electrically-conductive unit. The light-source chip is received in the case. Each of the first and second electrically-conductive parts is a part of the case. The case is mounted to the substrate. The electromagnetic shield plate covers at least part of the substrate.
Implementation Method 2
The electrically-conductive layer is formed on the substrate and electrically connected with both the second electrically-conductive part and the electromagnetic shield plate. The electrically-conductive unit is provided to electrically connect the first electrically-conductive part and the electromagnetic shield plate.
Data Source
AI summary
A light-source apparatus includes a light-source chip, a case, first and second electrically-conductive parts, a substrate, an electromagnetic shield plate, an electrically-conductive layer and an electrically-conductive unit. The light-source chip is received in the case. Each of the first and second electrically-conductive parts is a part of the case. The case is mounted to the substrate. The electromagnetic shield plate covers at least part of the substrate. The electrically-conductive layer is formed on the substrate and electrically connected with both the second electrically-conductive part and the electromagnetic shield plate. The electrically-conductive unit is provided to electrically connect the first electrically-conductive part and the electromagnetic shield plate.