PCB Teaching Patterns for Component Mounting Alignment
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Solution Overview
Problem
The existing techniques for mounting electronic components on printed circuit boards face challenges due to the misalignment of silkscreen-printed markings relative to the electrode pads, leading to incorrect positioning of electronic components.
Innovation Solution
The use of electrically conductive teaching patterns, formed in the same process as the electrode pads, to accurately indicate the mountable range of electronic components, ensuring precise alignment and mounting positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If silkscreen printing is used to form mounting position lines, then the mounting position indication is provided, but the position accuracy relative to electrode pads deteriorates due to process differences
Solution Approach 1:
The patent merges the formation of teaching patterns with the electrode pad formation process. Both are created in the same photolithography and etching process, ensuring they share the same reference frame and achieving sub-milimeter alignment accuracy, eliminating the cumulative errors from separate processes.
Solution Approach 2:
The teaching patterns serve as an intermediary reference system between the electrode pads and the silkscreen markings. They provide a precise, process-aligned reference that mediates the alignment between the PCB features and the component mounting positions.
2Ease of manufacture
If separate processes are used for forming silkscreen lines and electrode pads, then each process can be optimized independently, but the alignment between lines and pads deteriorates
Solution Approach 1:
The patent combines the teaching pattern formation with electrode pad formation into a single integrated process step. This merging ensures that both features are created with the same process precision and reference alignment, achieving sub-milimeter accuracy while maintaining manufacturing efficiency.
3Ease of operation
If electronic components are arranged to align with silkscreen lines, then the mounting process is simplified, but the mounting accuracy relative to electrode pads deteriorates
Solution Approach 1:
The teaching patterns act as an intermediary alignment reference that bridges the silkscreen markings and the electrode pads. Components are positioned relative to the teaching patterns, which are precisely aligned with the electrode pads, thereby ensuring accurate mounting while maintaining process simplicity.
Solution Approach 2:
The patent replaces reliance on less accurate silkscreen alignment with a more precise optical/electrical alignment system based on teaching patterns that are process-aligned with the electrode pads, achieving sub-milimeter positioning accuracy.
Data Source
Figure 1A~1C
Figure 2
Figure 3A~3C
AI summary
A printed circuit board (100) comprises a substrate (102) and an electrically conductive pattern (104). The pattern (104) includes an electrode pad (107a) and a teaching pattern (120a; 120b) that teaches a mountable range of an electronic component and includes a first line (131a; 131b) and a second line (132a; 132b). The electronic component includes a first side surface extending in a first direction. The first line and the second line extend in the first direction. In a second direction, the first side surface is between the first line and the second line. In the first direction, the first line and the second line are each in a position different from that of the first side surface.