Pre-tin Shaping System for Circuit Board Soldering
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Solution Overview
Problem
Soldering joints between pre-tin layers on circuit board pads and electrical connectors often fail due to dry or faulty connections, leading to structural and electrical failures.
Innovation Solution
A pre-tin shaping system comprising a heat-press unit with a contact tip and a movable unit that shapes the pre-tin layer on the circuit board pads, preventing molten tin from flowing to adjacent pads and ensuring precise positioning for reliable soldering connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-tin layer is applied on circuit board pad by surface mount technology, then electrical connection between circuit board and electrical connector is achieved, but soldering joints are commonly dry or faulty leading to connection failure
Solution Approach 1:
The patent applies preliminary action by performing a shaping operation on the pre-tin layer before the soldering process. A contact tip with a shaped heater is used to melt and reshape the pre-tin layer, creating a pre-tin shape that facilitates proper solder joint formation. This preliminary shaping ensures the pre-tin is in the correct configuration before electrical connectors are attached, preventing dry or faulty connections.
2Manufacturing precision
If pre-tin layer is melted and reshaped using heat-press unit, then precise pre-tin shaping is achieved preventing molten tin from flowing to adjacent pads, but device complexity increases
Solution Approach 1:
The shaping system is segmented into distinct functional components: a movable unit that positions the contact tip, a heat-press unit that applies thermal energy, and a contact tip with an integrated shaped heater. This segmentation allows each component to perform its specific function efficiently while maintaining overall system precision for controlling molten tin flow.
Solution Approach 2:
The contact tip with the shaped heater acts as an intermediary between the heat source and the pre-tin layer. It delivers controlled thermal energy to melt and reshape the pre-tin while preventing excessive heat spread to adjacent pads. The shaped heater's geometry serves as a mediator to confine the molten tin within desired boundaries.
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
The system reduces the risk of faulty soldering by precisely shaping the pre-tin layer, enhancing the reliability of electrical connections between the circuit board and electrical connectors.
Implementation Method 1
The contact tip 10 is moved to contact a pre-tin layer 5 on a pad 7 of the circuit board 4. The pre-tin layer 5 is melted by the shaped heater 12 at a temperature at which the pre-tin will be molten
Data Source
AI summary
A pre-tin shaping system is disclosed. The pre-tin shaping system comprises a base securely holding a circuit board having a pre-tin layer, a heat-press unit having a contact tip, and a movable unit moving the heat-press unit relative to the base. The contact tip is movable to shape the pre-tin layer.