Circuit Assembly Solder Restricting Layer
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Solution Overview
Problem
Conventional techniques for soldering electronic components to busbars require additional space for restricting solder spread, making it difficult to achieve high accuracy and reduce circuit assembly size.
Innovation Solution
A circuit assembly with a solder restricting layer, such as a sticky sheet or solder resist films, is used between the circuit board and busbars to restrict solder spread by forming patterns around the soldering regions, allowing for precise positioning and size reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a punched portion (slit or small hole) is provided on the busbar to restrict solder spread, then the electronic component can be positioned with high accuracy, but additional space is required on the busbar which prevents further reduction in circuit assembly size
Solution Approach 1:
A solder restricting layer (adhesive sheet or sticky sheet) is introduced as an intermediary between the busbar and the electronic component. This layer contains a pattern (such as a sheet opening) that restricts solder spread, eliminating the need for punched portions on the busbar itself and freeing up space on the busbar for other purposes.
Solution Approach 2:
The solder restricting layer is segmented into a pattern (such as a sheet opening with end portions) that selectively restricts solder in specific regions. This segmentation allows precise control over solder flow paths while maintaining flexibility in the overall design and reducing the space required compared to a solid busbar structure with punched portions.
2Manufacturing precision
If surface tension of solder is utilized to restrict solder spread, then the electronic component can be installed without shifting, but it is not easy to restrict the spread of solder with high accuracy
Solution Approach 1:
The solder restricting layer acts as a physical intermediary that provides mechanical barriers (end portions of the sheet opening) to restrict solder spread. This approach is more reliable than relying solely on surface tension, as the physical structure of the restricting layer can be precisely controlled during manufacturing to achieve accurate solder containment.
Solution Approach 2:
The solder restricting layer is implemented as a thin film (adhesive sheet or sticky sheet) that can be easily applied to the busbar surface. This thin film structure provides effective solder restriction while being simple to manufacture and apply, overcoming the limitations of relying on surface tension alone.
3Area of stationary object
If a commonly used sticky sheet or adhesive sheet with an opening is used as the solder restricting layer, then the size of the circuit board can be reduced, but the opening must be formed in an accurate shape to restrict solder spread with high accuracy
Solution Approach 1:
The pattern (sheet opening) is pre-formed in the solder restricting layer before the soldering process. This preliminary formation of the restricting pattern allows for precise control of solder flow during soldering, as the physical barriers are already in place. The opening shape can be accurately controlled during the manufacturing of the adhesive sheet or sticky sheet itself.
Solution Approach 2:
The use of flexible thin films (adhesive sheets or sticky sheets) allows for precise formation of the opening pattern through standard manufacturing techniques. These thin films can be easily cut or molded into accurate shapes, providing the necessary precision for solder restriction while allowing for miniaturization of the overall circuit board.
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 solution effectively restricts solder spread with high accuracy, enabling precise positioning of electronic components while minimizing the circuit assembly's size.
Implementation Method 1
The solder is thus bulged due to surface tension, and the bulged solder is pressed onto the outer surface of the terminal
Implementation Method 2
the end portions forming the opening in the sticky sheet or adhesive sheet can be used as walls for restricting the spread of the solder
Data Source
AI summary
A circuit assembly includes a circuit board provided with a connection opening, a plurality of busbars provided on a back surface of the circuit board, an electronic component provided with connection terminals that are soldered to the corresponding busbar exposed through the connection opening, and a solder restricting layer that is provided between the circuit board and the plurality of busbars and includes a pattern surrounding a soldering region of the busbar to which the connection terminals are soldered.