USB Connector Contact Arrangement for Stable Pressure
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Solution Overview
Problem
USB connectors with increased contact numbers face interference issues between movable and stationary contacts, leading to unstable contact pressure and potential buckling, when trying to maintain compatibility with existing devices.
Innovation Solution
The arrangement of stationary and cantilevered movable contacts on the USB connector insulator, where specific contacts are positioned in a way that their tip ends are shifted laterally and obliquely to avoid interference, allowing all movable contacts to engage properly with the insulator, providing stable contact pressure and preload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the number of contacts is increased from four to five or more, then the transmission speed is enhanced, but interference occurs between movable and stationary contacts leading to unstable contact pressure and potential buckling
Solution Approach 1:
The patent applies dimensional change by shifting the tip end of the movable contact in the right-left direction (lateral dimension) rather than only in the forward direction. This creates a positionally shifted arrangement where the tip end is located at a position different from the contact portion in the right-left direction, allowing increased contact density without interference while maintaining stable contact pressure
2Speed
If the number of contacts is increased from four to five or more, then the transmission speed is enhanced, but the device complexity increases due to additional contact housing grooves and contacts
Solution Approach 1:
The patent applies local quality by making only the specific movable contact (those arranged in substantially one row with stationary contacts) have a positionally shifted tip end, while other movable contacts can maintain conventional arrangements. This localized modification allows the system to achieve enhanced transmission speed without uniformly increasing complexity across all contacts
3Reliability
If tip end portions of movable contacts are engaged with the insulator, then the contact pressure is stabilized, but interference occurs with stationary contacts when contacts are arranged in substantially one row
Solution Approach 1:
The patent resolves the interference problem by changing the arrangement from a single-row configuration to a multi-dimensional configuration. The tip end is shifted in the right-left direction, creating a staggered or offset arrangement that allows engagement with the insulator without interfering with stationary contacts, thereby maintaining contact pressure stability
Data Source
AI summary
It is an object of the invention to provide a connector in which a plurality of stationary contacts 5 are arranged on an insulator 3, a plurality of cantilevered movable contacts 8 are arranged in rear of the stationary contacts while tip end sides are placed in a front side, and, even when at least one specific stationary contact 5b of the stationary contacts 5 and at least one specific movable contact 8b of the movable contacts 8 are arranged in substantially one row in a state where the specific contacts are anteroposteriorly close to each other, tip end portions of all of the movable contacts can be engaged with the insulator.