Projecting Member Attracts Solder to Prevent Bridging
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Solution Overview
Problem
Existing techniques for soldering electronic components to circuit boards are inadequate in preventing solder bridging when the distance between terminals is short, leading to insufficient pulling force and potential solder bridging issues.
Innovation Solution
The use of a projecting member that attracts molten solder from the interspace between terminals with shorter projection lengths, utilizing a greater surface area to prevent solder bridging by equalizing surface tensions and facilitating efficient solder joining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between two adjacent terminals is shortened to improve productivity, then terminal spacing is reduced, but solder bridging risk increases due to insufficient pulling force
Solution Approach 1:
A projecting member is introduced as an intermediary element between adjacent terminals. This projecting member has a longer projection length than the terminals and attracts molten solder toward itself, acting as a mediator that redirects solder flow away from the interspace between terminals, thereby preventing solder bridging even when terminals are closely spaced
Solution Approach 2:
The projection length parameter of the projecting member is specifically designed to be longer than that of the terminals. This parameter change increases the surface area and extends the attractive range for molten solder, creating a stronger pulling force that effectively draws solder away from the interspace between closely spaced terminals
2Reliability
If unequal projection lengths of terminals are used to create pulling force, then solder bridging is prevented, but device complexity increases
Solution Approach 1:
Instead of modifying all terminals to have unequal lengths, a single projecting member is introduced as an intermediary. This simplifies the overall structure by maintaining uniform terminal lengths while still achieving the necessary pulling force through the projecting member's longer projection
Solution Approach 2:
The projecting member serves multiple functions: it provides the necessary pulling force to prevent solder bridging, acts as a solder attractor, and maintains structural simplicity. This multi-functional element replaces the need for complex unequal terminal arrangements
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 solution effectively prevents solder bridging and solder ball formation by attracting molten solder from shorter terminals to longer terminals with increased surface area, ensuring reliable connections and improved production efficiency while maintaining cost-effectiveness.
Implementation Method 1
the projecting member is located at an adjacent position adjacent to the neighboring terminal, to attract molten solder from the interspace toward the projecting member during soldering
Data Source
AI summary
First and second terminals project from a circuit board and lie adjacent to each other with an interspace formed between the first and second terminals. An electronic apparatus further includes a projecting member projecting along a neighboring terminal which is one of the first and second terminals at such a position that the neighboring terminal is located between the projecting member and the interspace. The projecting member is located at an adjacent position adjacent to the neighboring terminal, to attract molten solder from the interspace toward the projecting member during soldering to join the first and second terminals to the circuit board.