PCB Mounting Head Alignment for Offset Top-Side Features
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Solution Overview
Problem
Conventional board work machines struggle to achieve accurate mounting of components with characteristic sections on their upper surfaces, as the characteristic sections are often offset from the component's center, leading to suboptimal mounting accuracy even after calibration.
Innovation Solution
A board work machine equipped with a mounting head, memory for correction values, and an upper imaging device that captures images of the component's surface to determine position deviations and correct the mounting position based on specific correction values, ensuring the characteristic section is accurately positioned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed based on the center position of the component outline, then the mounting position can be corrected, but the characteristic section position remains shifted leading to poor mounting accuracy
Solution Approach 1:
The patent divides the component into two distinct reference systems: the component outline (for basic positioning) and the characteristic section (for precision alignment). By segmenting the reference framework, the system can apply different correction values to each, ensuring both the component body and its functional characteristic section are accurately positioned during mounting.
Solution Approach 2:
The patent introduces a new dimensional aspect by adding characteristic section position correction to the traditional outline-based positioning system. This creates a two-layer correction framework where outline correction provides baseline positioning and characteristic section correction provides precision alignment, effectively adding a dimensional layer of accuracy.
2Ease of operation
If a single correction value is used for all components, then the mounting process is simplified, but components with characteristic sections cannot achieve accurate positioning
Solution Approach 1:
The patent implements a dynamic correction system that automatically selects and applies appropriate correction values based on the component type. The system transitions from a static single-correction approach to a dynamic multi-correction framework, where the control device determines whether to apply outline correction, characteristic section correction, or both, optimizing both simplicity and precision for each component.
Solution Approach 2:
The patent changes the correction parameter structure from a single uniform value to multiple component-specific parameters. By introducing characteristic section correction values as a new parameter dimension, the system can adjust mounting positions with finer granularity, transforming the correction mechanism from coarse to fine-tuned while maintaining operational efficiency through automated selection.
Data Source
AI summary
A dedicated correction value related to the mounting position of an upper surface recognition component with a characteristic section on an upper surface thereof is memorized in correction value folder 43a of an HDD, and when performing mounting work of mounting the upper surface recognition component on a board, a position deviation amount of the characteristic section is acquired based on an image of the upper surface of the upper surface recognition component captured by a mark camera, and the component is mounted at the mounting position based on the acquired position deviation amount and the dedicated correction value. Accordingly, it is possible to mount the specific component at a corrected mounting position such that the position of the characteristic section is appropriate, thereby improving mounting accuracy for the upper surface recognition component.