Fastener Blocker Prevents Solder Paste Intrusion in PCB Assembly
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Solution Overview
Problem
Conventional fasteners lack a blocker in the axial threaded bore, allowing solder paste to enter and interfere with screw tightening, making it difficult to connect printed circuit boards with fixed bodies.
Innovation Solution
A fastener with a recessed area at the end of the axial threaded bore that accommodates a removably fitted blocker, preventing solder paste from entering the bore and allowing unobstructed screw threading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no blocker is provided in the axial threaded bore, then the fastener structure is simple, but solder paste enters the bore and interferes with screw tightening
Solution Approach 1:
A blocker is preliminarily placed in the recess at the end of the axial threaded bore to prevent solder paste from entering the bore during the welding process. The blocker is positioned in advance before the screw tightening operation, ensuring that the threaded bore remains clean and accessible for successful screw insertion and tightening.
2Reliability
If a blocker is added to prevent solder paste entry, then screw tightening reliability improves, but fastener structure complexity increases
Solution Approach 1:
The fastener is segmented into distinct functional parts: the main fastener body with the axial threaded bore, and a separate blocker component that fits into a recess at the end of the bore. This segmentation allows the blocker to be a simple, removable element that performs the specific function of preventing solder paste entry without complicating the overall fastener design. The blocker can be easily removed after welding to allow screw insertion.
3Strength
If the inserting head compresses solder paste, then the printed circuit board is securely fixed, but solder paste is forced into the axial threaded bore
Solution Approach 1:
The blocker acts as an intermediary element positioned at the end of the axial threaded bore. When the inserting head compresses the solder paste during the welding process, the blocker serves as a barrier that prevents the compressed solder paste from being forced into the threaded bore. This intermediary structure allows the welding force to be effectively transmitted to fix the printed circuit board while blocking the harmful path of solder paste intrusion.
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 blocker effectively prevents solder paste from interfering with screw insertion, ensuring successful tightening and convenient connection of printed circuit boards with fixed bodies.
Implementation Method 1
The blocker is removably fitted in the recess of the fastener body. When the connecting head of the fastener body is extended through a fixing hole on a printed circuit board with the blocker fitted in the recess, solder paste applied over the fixing hole is prevented from entering into the axial threaded bore of the fastener body
Data Source
AI summary
An improved fastener includes a fastener body and a blocker. The fastener body has an end functioning as a connecting head, and center of the fastener body forms an axial threaded bore. An end of the axial threaded bore corresponding to the connecting head is formed into a recess surrounded by the connecting head. The blocker is removably fitted in the recess of the fastener body. When the connecting head of the fastener body is extended through a fixing hole on a printed circuit board with the blocker fitted in the recess, solder paste applied over the fixing hole is prevented from entering into the axial threaded bore of the fastener body to interfere with a screw being threaded into the fastener body.