Board Connector Anchor Tab Thermal Expansion Clearance
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Solution Overview
Problem
In SMT connectors, thermal expansion differences between the connector housing and the circuit board lead to direct loading on soldered areas, causing cracking and deterioration of anchoring reliability over time.
Innovation Solution
A board connector design featuring a connector housing with press-fit attachment portions and tapered guides that create clearance between the anchor hardware and the connector housing, allowing for dimensional changes due to thermal expansion differences to be absorbed without direct loading on soldered areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the connector housing is soldered directly to the circuit board using anchor hardware, then the anchoring strength is improved, but thermal expansion differences cause direct loading on soldered areas leading to cracking and deterioration of reliability
Solution Approach 1:
The patent introduces an intermediary structure (the press-fit attachment portion with tapered guide and clearance space) between the connector housing and the circuit board. This intermediary absorbs thermal expansion differences through the clearance, preventing direct transmission of thermal loads to the soldered anchor hardware, thereby maintaining both anchoring strength and soldered area reliability
Solution Approach 2:
The patent designs the press-fit attachment portion with a tapered guide that creates clearance beforehand, allowing the connector housing to expand and contract thermally without imposing loads on the soldered areas. This pre-designed clearance acts as a cushion that absorbs thermal stresses before they can damage the soldered connections
2Strength
If the anchor hardware is press-fitted tightly to the connector housing, then the holding strength is improved, but thermal expansion causes direct loading on soldered areas
Solution Approach 1:
The patent applies local quality by creating a specific clearance zone in the press-fit attachment portion while maintaining tight press-fit holding in other areas. The tapered guide provides localized clearance exactly where thermal expansion occurs, allowing the anchor hardware to be held firmly while isolating the soldered areas from thermal loads
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances anchoring reliability by preventing direct loading on soldered areas from thermal changes, thereby reducing the risk of cracking and maintaining reliable connections.
Implementation Method 1
loads are imposed directly on soldered areas between the conductor of the circuit board and the anchor hardware even for reasons of a difference in a coefficient of linear expansion of the circuit board and a coefficient of linear expansion of the connector housing, which originates from temperature changes
Data Source
AI summary
There is provided a board connector that prevents loads due to thermal changes in a connector housing from being directly imposed on soldered areas of anchor hardware and that enhances anchoring reliability of the anchor hardware. A board connector includes a connector housing to be populated on a circuit board, anchor hardware for soldering the connector housing to the circuit board, holding grooves that are formed on the connector housing and capable of press-fitting and holding upper lugs of the anchor hardware, and tapered portions that are formed in the respective holding grooves and that guide the upper lugs of each of the pieces of press-fitted anchor hardware in a direction away from each side surface of the connector housing, thereby creating clearance S between the anchor hardware and respective opposing side surfaces of the connector housing.