Audio Jack Grounding Contact Deflection Prevention
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Solution Overview
Problem
Audio jack connectors experience deflection of grounding contacts, leading to potential damage in the connection with the printed circuit board and compromised grounding and waterproofing effects.
Innovation Solution
The audio jack connector design includes a grounding contact with a connecting portion that forms an auxiliary wing portion, engaging with the insulative housing to prevent deflection, ensuring all soldering portions remain coplanar and maintaining effective grounding and waterproofing by using a waterproof ring and film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the grounding contact extends a large length from the front face to the rear face to achieve better waterproof function, then the waterproof function is improved, but the grounding contact tends to deflect causing connection damage and influencing grounding effect
Solution Approach 1:
The grounding contact is divided into multiple segments: a retaining portion at the rear, a connecting portion in the middle, and a contacting portion at the front. This segmentation allows each part to perform its specific function while reducing overall deflection. The retaining portion is fixed in a terminal passageway, the connecting portion provides structural support, and the contacting portion makes electrical contact, thereby maintaining stability while achieving waterproofing.
Solution Approach 2:
The grounding contact is arranged along the rear-to-front direction (length dimension) rather than extending laterally. By orienting the grounding contact along the insertion axis, the design achieves waterproof sealing at the front face without requiring the contact to extend significantly in lateral dimensions, thus reducing deflection while maintaining waterproof effectiveness.
2Reliability
If the grounding contact is arranged nearest to the insertion opening to achieve better grounding purpose, then the grounding effect is improved, but the grounding contact becomes more susceptible to deflection and connection damage
Solution Approach 1:
The grounding contact is pre-positioned and retained in the terminal passageway at the rear of the housing before the audio plug is inserted. This preliminary positioning ensures that the contacting portion is already in place to make immediate electrical contact when the plug is inserted, achieving timely grounding without requiring the contact to be overly long or vulnerable.
Solution Approach 2:
Different portions of the grounding contact have different properties optimized for their specific functions: the retaining portion is designed for secure mounting in the terminal passageway, the connecting portion provides mechanical strength and flexibility, and the contacting portion is optimized for electrical contact. This local differentiation allows the contact to achieve both effective grounding and resistance to deflection.
Data Source
AI summary
An audio jack connector (100) includes an insulative housing (1) and a number of contacts (2) retained in the insulative housing. The insulative housing defines a receiving channel (14) and a number of terminal passageways (121). The contacts include a grounding contact (25, 25′) having a retaining portion (256; 256′) retained in the corresponding terminal passageway, a contacting portion (257; 257′) extending from the retaining portion into the receiving channel, a soldering portion (258; 258′) coplanar with a mounting face of the insulative housing, and a connecting portion (259; 259′) vertically connected between the retaining portion and the soldering portion. The connecting portion forms an auxiliary portion (2591; 2591′). Both the auxiliary portion and the retaining portion engage with the insulative housing.