Appearance Inspection Route Planning With Variable Lens Focus
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Solution Overview
Problem
Existing appearance inspection systems face difficulties in setting an optimal route for the imaging device relative to the target at multiple inspection positions due to limited degrees of freedom, making it challenging to satisfy preset requirements such as route length, curvature, and time constraints.
Innovation Solution
An appearance inspection system with a decision part, selection part, and lens control part that uses a lens module with a variable focus position to determine and select relative positions for the imaging device, generating a designation route that satisfies preset requirements by calculating an evaluation value based on route length, curvature, and time, ensuring a consistent imaging field of view and focus across multiple positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a lens module with a fixed focus position is used, then the device complexity is reduced, but the degree of freedom of imaging positions is limited, making it difficult to satisfy preset route requirements
Solution Approach 1:
The lens module's focus position is made dynamically adjustable rather than fixed. The focus position changing mechanism allows the lens to adapt its focal distance according to different imaging positions, thereby resolving the contradiction between device simplicity and imaging flexibility.
Solution Approach 2:
The focal distance parameter of the lens module is made variable. By changing the focus position parameter, the system can accommodate multiple imaging positions and satisfy various route requirements without increasing overall system complexity.
2Measurement precision
If the focus position of the lens module is changed for each inspection target position, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The focus position for each inspection target position is predetermined and stored in advance. The lens control part retrieves and applies the appropriate focus position based on the current inspection target, eliminating the need for real-time focus calculation and reducing control system complexity.
Solution Approach 2:
The lens control part automatically adjusts the focus position based on pre-stored information corresponding to different inspection target positions. This self-service mechanism eliminates the need for complex manual intervention or real-time computational control.
3Reliability
If multiple relative position candidates are considered for each inspection target position, then the route satisfaction of preset requirements is improved, but the calculation complexity increases
Solution Approach 1:
Multiple relative position candidates for each inspection target position are predetermined and stored in advance. The selection part chooses from these pre-calculated candidates based on route requirements, avoiding complex real-time calculations and reducing computational complexity.
Solution Approach 2:
The route planning is segmented into discrete position candidates for each inspection target. By dividing the continuous position space into discrete candidates, the system simplifies the optimization problem while still satisfying route requirements through selective combination of candidates.
Data Source
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AI summary
An appearance inspection system (1) enabling a route to be easily set when a target (W) is imaged while causing a relative position of an imaging device (10) with respect to the target (W) to be different is provided. A decision part (64) decides a plurality of relative position candidates of the imaging device (10) with respect to the target (W) at which focus of a lens module (12) is possible on the inspection target position with regard to each of a plurality of the inspection target positions on the target (W). A selection part (65) selects relative positions one by one from corresponding plurality of relative position candidates for each of the plurality of inspection target positions and selects a route candidate satisfying a preset requirement from a plurality of route candidates generated by sequentially connecting the plurality of selected relative positions as a designation route.