Interposer Grounding via Metal Case for Noise Reduction
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Solution Overview
Problem
Existing electronic apparatuses face challenges in stabilizing the ground potential of ground lines, particularly when connected to metal cases, leading to increased external noise and insertion loss due to the design's reliance on surface-mounted flat cables, which occupy significant space and limit the use of metal cases for grounding.
Innovation Solution
An interposer with insulating element bodies, wiring electrodes, and terminal electrodes is used to connect the ground line to a metal case or circuit substrate, featuring through-holes for metal fixing members and thread grooves for secure fixation, allowing for stable grounding without increasing the size of the circuit substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat cable is surface-mounted at the circuit substrate to connect ground lines, then the ground potential can be stabilized, but the circuit substrate occupies significant space and limits the use of metal cases for grounding
Solution Approach 1:
The invention transitions the grounding connection from a two-dimensional surface-mounted flat cable configuration to a three-dimensional vertical connection through the interposer structure. The interposer extends upward from the circuit substrate, allowing the ground terminal electrode to connect to the metal case in the vertical dimension rather than requiring extensive horizontal space on the substrate surface.
Solution Approach 2:
The interposer acts as an intermediary component between the circuit substrate and the metal case. It provides a dedicated grounding path through its ground terminal electrode that connects to the metal case, separating the grounding function from the signal transmission function and enabling stable grounding without occupying substrate area.
2Reliability
If intermediate ground terminal electrodes are provided at the transmission line portion to stabilize ground potential, then external noise and insertion loss are reduced, but the device complexity increases
Solution Approach 1:
The invention extracts the grounding function from the flat cable structure and relocates it to the interposer component. Instead of providing multiple intermediate ground terminal electrodes within the flat cable, the grounding function is consolidated in the interposer's ground terminal electrode that connects directly to the metal case, simplifying the flat cable structure while maintaining grounding effectiveness.
Solution Approach 2:
The interposer serves as an intermediary that provides the grounding connection to the metal case, eliminating the need for complex intermediate grounding structures within the flat cable. The single ground terminal electrode in the interposer replaces multiple distributed ground electrodes, reducing complexity while achieving the same grounding objective.
3Ease of operation
If the flat cable is used for signal transmission, then electrical connection is achieved, but additional electronic components and wiring cannot be mounted in the space above
Solution Approach 1:
The invention segments the functional responsibilities by separating signal transmission (handled by the flat cable) from grounding (handled by the interposer). This segmentation frees up the space above the circuit substrate, as the interposer's vertical structure provides grounding without occupying horizontal space that would be needed for additional components and wiring.
Solution Approach 2:
By implementing grounding in the vertical dimension through the interposer structure, the invention frees up the horizontal space above the circuit substrate. This dimensional reorganization allows additional electronic components and wiring to be mounted in the previously occupied space while maintaining electrical connection capabilities.
Data Source
AI summary
An interposer includes an insulating element body, a wiring electrode inside the element body, a signal terminal electrode at the top surface of the element body and connected to a flat cable with a conductive bonding material interposed therebetween, and a ground terminal electrode. A through-hole penetrates through the element body to allow a bar-shaped metal fixing member to be inserted. A metal fixing member connecting electrode to be electrically connected to a metal fixing member is provided at at least one of the top surface of the element body and an inner wall of the through-hole. Predetermined signal terminal electrodes are electrically connected by the wiring electrode. The ground terminal electrode and the metal fixing member connecting electrode are electrically connected.