Board Inspection Imaging with Regional Focus Height Setting
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Solution Overview
Problem
Conventional inspection devices require multiple height adjustments for each component on a board, leading to increased time for capturing inspection images, making prompt inspection difficult.
Innovation Solution
The device employs a fixed focus type camera with a moving mechanism to adjust the camera's height based on a representative value of component heights, allowing for quick capture of inspection images by setting reference positions for each region of the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the camera is vertically moved to adjust the height position for each component, then the focus accuracy for each component is improved, but the inspection time increases
Solution Approach 1:
The board is divided into multiple regions, and a reference position is set for each region based on the heights of components in that region. This segmentation allows the camera to capture images of multiple components within each region at a single height position, avoiding the need to adjust the camera for every individual component while maintaining acceptable focus quality for inspection purposes.
2Adaptability or versatility
If the camera vertically moves to capture images of multiple components with different heights, then all components can be inspected, but the number of height adjustments increases inspection time
Solution Approach 1:
Reference positions are pre-calculated for each region based on component height information obtained before inspection. By determining these reference positions in advance, the system can quickly move the camera to the appropriate height for each region without performing time-consuming height adjustments during the actual image capture process, thereby maintaining both inspection coverage and speed.
Data Source
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AI summary
An inspection device that performs inspection by using an inspection image of a board on which multiple components are disposed, the inspection device includes a fixed focus type camera, a lifting/lowering mechanism configured to move the camera up or down relative to the board, a setting section configured to acquire height information of the components, and set a reference position separated from a top surface of the board by a distance corresponding to a height of each of the components according to a predetermined setting method such that an imaging surface of each component within an imaging range of the camera is included in a depth of field of the camera, and a control section configured to control the lifting/lowering mechanism and the camera such that the inspection image is captured after the camera is relatively moved up or down to focus on the reference position.