Circuit Board Slit Layout for Steel Stencil Support in SMT
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Solution Overview
Problem
In surface mounted technology, steel stencils used for solder paste deposition on printed circuit boards are prone to deformation and damage due to lack of support, leading to precision issues and reduced service life during the solder application process.
Innovation Solution
A circuit board design with alternately distributed first and second regions, each divided by slits, provides extension portions that act as supporting points for the steel stencil, minimizing deformation and extending its service life by distributing support in both row and column directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slits are formed on the metal layer to divide it into multiple mutually insulated metal sheets, then circuit functionality is improved, but the steel stencil becomes susceptible to deformation and sinking during solder printing
Solution Approach 1:
The metal layer is divided into multiple mutually insulated metal sheets through slits, enabling independent circuit functionality while maintaining structural integrity for stencil support
Solution Approach 2:
The extension portions are selectively provided on specific metal sheets at strategic locations to provide localized support points for the steel stencil during solder printing, without affecting overall circuit functionality
2Adaptability or versatility
If continuous vertical slits are used to divide metal sheets, then circuit separation is improved, but the steel stencil sinks excessively and may be damaged
Solution Approach 1:
The continuous vertical slits are segmented into interrupted slits by adding extension portions, which maintain circuit separation while providing support points to prevent excessive stencil sinking and damage
Solution Approach 2:
The slit configuration is changed from continuous to interrupted, altering the structural parameters to balance circuit separation with stencil support requirements
3Duration of action of stationary object
If the steel stencil is supported adequately to prevent deformation, then service life is extended, but the circuit board structure becomes more complex
Solution Approach 1:
The support function is segmented into discrete extension portions on specific metal sheets rather than requiring a comprehensive structural reinforcement, simplifying the overall design while achieving adequate support
Solution Approach 2:
The metal sheets themselves provide support functionality through their extension portions, eliminating the need for separate support structures and reducing overall device complexity
Data Source
AI summary
The present application relates to a circuit board and an electronic device. The first slit is used to divide the metal layer on the substrate into at least two first regions and second regions that are alternately distributed and mutually insulated in a row direction and a column direction; the second slit in each row direction of the first regions is interrupted by the first extension portion of at least a portion of the metal sheets within the first regions along the column direction; the second slit in each column direction of the second regions is interrupted by the second extension portion of at least a portion of the metal sheets within the second regions along the row direction.