3D Image Correction for Electronic Circuit Deformation

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Solution Overview

Problem

Existing optical inspection systems for electronic circuits face challenges in accurately comparing three-dimensional images due to deformations, which hinder the precise analysis of solder paste blocks and electronic components, and current methods do not effectively correct all types of deformations, especially 3D deformations, making it difficult to determine geometric parameters accurately and efficiently on an industrial scale.

Innovation Solution

A method that involves creating a digital model of an undeformed object, acquiring two-dimensional and three-dimensional images, determining geometric transformations to map deformed areas to undeformed areas, and applying these transformations to correct the images, allowing for precise comparison and analysis of electronic circuits with deformations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing correction methods are used, then some deformations are corrected, but not all deformations (especially 3D deformations) are corrected accurately

Engineering Contradiction:

Improvedeformation correction accuracyVSAvoidcompleteness of deformation correction

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent transitions from 2D image correction to 3D image correction by acquiring and processing three-dimensional images of the printed circuit. This allows the system to capture and correct 3D deformations (warpage, bends) that 2D methods cannot detect or correct, thereby improving both measurement precision and reliability of deformation correction.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent creates a digital 3D model (copy) of the printed circuit that can be manipulated and corrected separately from the physical object. This digital copy allows for precise geometric transformations and deformations to be applied and analyzed without affecting the actual circuit, enabling accurate correction of all deformation types.

Inventive Principle:

Principle #26Copying

2Measurement precision

If complex correction methods are applied to correct all deformations, then correction accuracy improves, but processing time and complexity increase

Engineering Contradiction:

Improvegeometric parameter determination precisionVSAvoidimage processing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs correction operations on a digital 3D model before final analysis. By pre-processing the digital copy with complex geometric transformations and corrections, the system avoids time-consuming re-acquisition or re-processing of physical objects, thereby reducing overall processing time while maintaining high precision.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces physical manipulation and mechanical measurement systems with digital 3D modeling and computational correction methods. This substitution allows complex corrections to be performed efficiently through software algorithms rather than physical adjustments, significantly reducing processing time while improving accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If 3D images are used for inspection, then complete deformation information is captured, but comparison accuracy decreases due to deformations

Engineering Contradiction:

Improvedeformation detection completenessVSAvoidimage comparison accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent extracts the deformation information from the 3D image by comparing it with the digital model, separating the deformation characteristics from the overall image data. This extraction allows the system to identify and correct deformations specifically, rather than trying to compare the entire deformed image, thereby maintaining both completeness and accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a digital 3D model as an intermediary between the captured 3D image and the final comparison analysis. This intermediary model serves as a reference that mediates the comparison process, allowing deformations to be identified and corrected through geometric transformations before the final inspection comparison, thus resolving the accuracy issue.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP2984626B1Method of correcting a three-dimensional image of an electronic circuit

Publication Date: 2019.01.16 VIT SA

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AI summary

The invention relates to a method of correcting an initial three-dimensional image of a deformed object comprising the provision of a model of the undeformed object comprising first zones, the determination in the initial three-dimensional image of second zones corresponding to the first zones, the determination of a first geometric transformation which maps the second zones to the first zones and the determination of a three-dimensional image corrected on the basis of the first geometric transformation and of the initial three-dimensional image.