Optical Transceiver PCB Mounting System with EMI Containment
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Solution Overview
Problem
Optical transceiver modules face challenges in maximizing usable printed circuit board (PCB) surface area while minimizing electromagnetic interference (EMI) emissions, especially at high data rates, without affecting signal integrity or speed, and must comply with existing standard form factors.
Innovation Solution
A mounting system using pins with shafts and heads that secure the PCB within the transceiver module, minimizing surface occupation and incorporating a conductive path to contain EMI, with the pins and shell forming a grounded chassis to prevent EMI escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional screw mounting is used to secure PCB, then reliable mechanical fixation is achieved, but usable PCB surface area is reduced
Solution Approach 1:
The mounting function is segmented into multiple small pin contacts rather than a single large screw contact, distributing the mechanical fixation across multiple points while minimizing individual contact area on the PCB
Solution Approach 2:
The mounting pins are extracted from traditional screw mechanisms, removing the need for large threaded holes and complex fastening structures, thereby preserving PCB surface area while maintaining fixation reliability through precise pin positioning and enclosure engagement
2Area of moving object
If PCB surface area is maximized for component placement, then component density increases, but EMI containment capability deteriorates
Solution Approach 1:
The mounting pins are merged with EMI containment functionality by making them conductive and electrically connecting them to the enclosure, so that the same structural elements that secure the PCB also serve as EMI shielding pathways
Solution Approach 2:
The mounting pins perform multiple functions simultaneously: mechanical support, electrical grounding, and EMI containment, eliminating the need for separate EMI shielding structures that would consume additional PCB or enclosure space
3Object-generated harmful factors
If EMI containment structures are added to the module, then EMI emissions are reduced, but device complexity increases
Solution Approach 1:
The EMI containment function is merged into the existing mounting structure and enclosure, eliminating the need for separate EMI shielding components such as additional foils, meshes, or dedicated shielding structures
Solution Approach 2:
The mounting pins and enclosure structure serve their own primary functions while simultaneously providing EMI containment, making the system self-sufficient without requiring additional dedicated EMI protection components
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
The solution effectively increases usable PCB area for component placement while reducing EMI emissions, maintaining high-speed signal integrity and compatibility with existing standards.
Implementation Method 1
The pin and shell form a conductive path to contain EMI
Implementation Method 2
The pin and shell form a conductive path to contain EMI
Data Source
AI summary
A mounting system for securing a printed circuit board in a communication module, such as an optical transceiver module, is disclosed. In one embodiment, the transceiver module includes an outer shell and an enclosure that cooperate to contain the printed circuit board therein. The mounting system comprises first and second pins, wherein each pin includes a first end passing through respective holes coaxially defined in both the shell and the printed circuit board. The pins also each have a second end that includes a head. The head is positioned in a recess defined in an exterior portion of the shell such that the head does not interfere with insertion or removal of the transceiver module from a slot of a host device. Further, the second pin is electrically connected with both the outer shell and enclosure to prevent emissions of electromagnetic interference from the distal end of the transceiver.