High-Speed Electrical Connector Sealing for Contaminant Blocking
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Solution Overview
Problem
Conventional card edge connectors have larger channels that allow contaminants to enter, degrading signal integrity due to openings at the mounting surface, which can lead to poor contact between mating components and conductive elements.
Innovation Solution
The electrical connector design features a housing with channels and conductive elements that include a seal comprising a first and second sealing element, where the second sealing element extends beyond the first to block openings, and the conductive elements are wider to engage the housing, reducing movement and allowing the sealant to fill gaps, ensuring complete sealing and high-speed signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional card edge connectors use larger channels to accommodate conductive elements, then ease of manufacture and assembly is improved, but signal integrity deteriorates due to contaminant entry through openings at the mounting surface
Solution Approach 1:
The connector is divided into separate functional components: a housing with channels, conductive elements, and a distinct seal component. The seal is further segmented into a first sealing element (molded plastic) and a second sealing element (adhered material), creating multiple barriers that prevent contaminant ingress while maintaining manufacturing simplicity through modular assembly
Solution Approach 2:
The seal acts as an intermediary component between the housing and the external environment. The first sealing element (molded plastic) and second sealing element (adhered sealant) work together as intermediate barriers that block contaminants from reaching the conductive elements through the channel openings at the mounting surface, thereby protecting signal integrity without complicating the overall manufacturing process
2Ease of operation
If channels are made larger for easier assembly, then ease of operation is improved, but protection against harmful factors worsens due to increased openings for contaminant entry
Solution Approach 1:
The sealing function is segmented into two distinct elements: the first sealing element (molded plastic) that provides structural integration, and the second sealing element (adhered sealant) that provides flexible contaminant blocking. This segmentation allows the channels to remain large for easy assembly while the combined sealing elements effectively block contaminant ingress paths
Solution Approach 2:
The second sealing element, adhered to the first sealing element, acts as a flexible sealing layer that conforms to the channel openings. This flexible sealant material can adapt to manufacturing tolerances and assembly variations, effectively blocking contaminants even when channels are large for ease of assembly
3Reliability
If conductive elements are made wider to engage the housing, then reliability is improved by reducing movement, but device complexity increases due to the need for precise engagement features
Solution Approach 1:
The conductive elements are merged with the housing through the seal structure. The intermediate portion of each conductive element is integrated into the seal, which itself is integrated into the housing. This merging approach provides stable mechanical engagement without requiring complex separate fastening features, as the seal serves as both the sealing mechanism and the engagement structure
Solution Approach 2:
The seal serves multiple functions simultaneously: it blocks contaminants from entering the channels, it provides mechanical engagement for the conductive elements, and it maintains positional stability during assembly and operation. This multi-functionality reduces the need for additional complexity in the housing and conductive element designs
Data Source
AI summary
A connector for reliably transmitting high-speed signals. The connector includes a housing having a mating face, a mounting face opposite the mating face, and channels extending to the mounting face. Conductive elements are disposed in respective channels, and each has a mounting end extending out of the mounting face. A seal is disposed at the mounting face. The seal includes a first sealing element (e.g., plastic) and a second sealing element (e.g., sealant). The second sealing element is stacked on the first sealing element. Subportions of the conductive element adjacent their mounting ends are embedded in the second sealing element. Such a configuration enables complete sealing of openings at the mounting face of the housing so as to block contaminants from entering the connector from the mounting face and enable the conductive elements to transmit high-speed signals (e.g., at a speed specified by DDR5 standard) reliably over time.