Fiducial Mark Allocation for Accurate PCB Component Mounting
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Solution Overview
Problem
Existing methods fail to provide a systematic approach for efficiently and accurately allocating fiducial marks to components on circuit boards, especially when global fiducial marks are not available due to design constraints, leading to difficulties in achieving precise component mounting.
Innovation Solution
A method and device for allocating at least two fiducial marks out of three or more based on whether the component's mounting position is within the defined range in the X and/or Y direction, enabling efficient and accurate mounting by determining suitable fiducial marks for each component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If global fiducial marks are used for all components, then mounting accuracy is improved, but reading time increases and efficiency decreases
Solution Approach 1:
The patent segments the fiducial mark allocation by component type and mounting position. Different components are assigned different fiducial marks based on their locations and requirements, rather than using a single global set of marks for all components. This segmentation allows the system to read fewer marks while maintaining accuracy for each specific component.
Solution Approach 2:
The patent implements local quality by allocating specific fiducial marks to specific components based on their mounting positions and accuracy requirements. Each component receives the appropriate level of fiducial mark allocation (one mark, two marks, or three marks) according to its local needs, optimizing both accuracy and efficiency for each component rather than applying a uniform approach.
2Manufacturing precision
If local fiducial marks are allocated to each component, then mounting accuracy for specific components is improved, but device complexity and allocation difficulty increase
Solution Approach 1:
The patent implements self-service by enabling the system to automatically allocate appropriate fiducial marks to components based on pre-stored allocation information. The mounting device queries the storage device to retrieve the allocated fiducial marks for each component, eliminating the need for manual allocation and reducing operational complexity while maintaining high accuracy.
Solution Approach 2:
The patent applies preliminary action by pre-establishing the allocation relationship between fiducial marks and components before the mounting process begins. The allocation information is stored in advance in the storage device, allowing the system to quickly retrieve and apply the appropriate fiducial marks during mounting without complex real-time decision-making.
3Measurement precision
If multiple fiducial marks are read for each component, then correction accuracy is improved, but reading time increases
Solution Approach 1:
The patent applies partial action by reading only the necessary number of fiducial marks for each component based on its specific requirements. Some components require only one fiducial mark, others require two, and some require three. This partial approach reads fewer marks overall compared to reading all global marks for every component, reducing reading time while maintaining sufficient correction accuracy for each component.
Data Source
AI summary
A fiducial mark allocation method including: allocating at least two fiducial marks out of three or more fiducial marks provided on a board to a component to be used for calculating a correction amount of a mounting position of the component on the board; determining whether the mounting position of the component is within a range defined by the fiducial marks in an X direction, a Y direction, or both the X direction and the Y direction, wherein the allocating of the at least two fiducial marks is performed based on whether the mounting position of the component is within a range defined by the fiducial marks in the X direction, the Y direction, or both the X direction and the Y direction.