HDMI Connector with Segmented Terminals for High-Speed Signal Integrity
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Solution Overview
Problem
Conventional HDMI connectors face challenges with high-frequency signal interference due to close terminal spacing, deformation during assembly, and inadequate size reduction, which affects high-frequency signal transmission and bandwidth requirements.
Innovation Solution
The design features an insulating body with two arms extending from opposite sides, a terminal holder for shorter terminals, and a shielding housing to accommodate the circuit board, reducing size and preventing deformation, while improving characteristic impedance for faster high-frequency signal transmission up to 48 Gbps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional insertion-type terminals are used in HDMI connectors, then the assembly process is simple and defect rate is low, but the terminal occupies more space causing the overall size of the electric connector to increase
Solution Approach 1:
The terminal is divided into multiple segments: a front portion for signal contact, a middle portion with reduced cross-section for insertion, and a rear portion for soldering. This segmentation allows the terminal to pass through the insulating body during assembly while maintaining compact overall dimensions, resolving the contradiction between simple assembly and reduced size.
Solution Approach 2:
The terminal cross-section is varied along its length rather than being uniform. The middle portion has a reduced cross-sectional area compared to the front and rear portions, allowing it to fit through the insulating body during insertion while the front and rear portions maintain sufficient size for electrical contact and soldering, respectively.
2Volume of moving object
If terminal spacing is reduced to achieve compact connector design, then the connector size is reduced, but high frequency signal transmission is more seriously interfered with due to adjacent terminals being too close
Solution Approach 1:
The insulating body incorporates localized shielding structures positioned between adjacent terminals. These shielding elements are strategically placed in the spaces between terminals to block electromagnetic interference while allowing the terminals to be closely spaced for compact connector design, thus resolving the contradiction between size reduction and signal quality.
3Ease of manufacture
If conventional length terminals are used, then the terminal can accommodate standard assembly processes, but the terminal is easily bent or deformed during assembly and may exit or drop from the insulating body
Solution Approach 1:
The terminal is segmented into distinct functional portions with the middle section having reduced dimensions. This segmentation creates a tapered profile that guides the terminal through the insulating body during assembly, preventing lateral displacement and ensuring proper positioning, thereby improving reliability without compromising manufacturability.
Solution Approach 2:
The terminal geometry is pre-designed with a reduced cross-sectional middle portion that acts as a guide during the assembly process. This preliminary geometric configuration ensures that the terminal naturally aligns and passes through the insulating body correctly before the final soldering step, preventing deformation and misalignment.
Data Source
AI summary
The present discloses illustrates an electric connector. In the electric connector, an abutting part of an insulating body includes two arms extended from two rear sides thereof, and a terminal holder of a terminal set is assembled between the two arms, the terminal holder is be integrally formed with conductive terminals, and the contact parts of the conductive terminals insert into terminal slots of the abutting part, respectively; and, a circuit board is assembled in the concave space formed between the two arms, and the solder parts of the conductive terminals are electrically connected to the first contact set on the upper and lower surfaces of the circuit board. The design of the insulating body in cooperation with the terminal set having decreasing length, can significantly reduce the size of entire electric connector and almost half of the circuit board can be accommodated in the insulating body.