Bottle Inspection Device with Tilted Deflection Mirrors
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Solution Overview
Problem
Existing bottle inspection devices suffer from image distortion and uneven bottle view sizes due to converging lines and stray light reflections, particularly when inspecting bottles in transmitted light, which complicates the evaluation of bottle conditions.
Innovation Solution
The inspection device employs tilted deflection mirrors in each beam path to compensate for central projection distortion, ensuring upright bottle views and using longer beam paths for lateral image areas to maintain consistent bottle view sizes, along with a light source and screen to minimize stray light reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the observer's position is placed just above the base of the bottle to inspect the side wall in transmitted light, then the inspection coverage is improved, but the perspective points converge diagonally upwards causing image distortion and converging lines
Solution Approach 1:
The patent changes the optical parameters by varying the beam path lengths for different circumferential views. Specifically, the beam path to the lateral image area is made longer than the beam path to the central image area, which compensates for the converging lines effect and produces uniformly sized bottle views across all image areas.
2Productivity
If several bottle views are projected side by side onto an image surface, then the inspection efficiency is improved, but the upper areas of the bottles appear to tilt towards the center causing evaluation difficulty
Solution Approach 1:
The patent applies different beam path lengths to different spatial locations in the image. The lateral image areas receive light through longer beam paths while the central area uses a shorter beam path, creating local optimization that ensures all bottle views appear upright and uniformly sized despite being projected side by side.
3Device complexity
If the beam paths for all bottle views are designed to be the same length, then the optical system is simplified, but the bottle views appear larger the further they are from the center of the image
Solution Approach 1:
The patent deliberately changes the beam path length parameter across different spatial locations. By making the beam path to lateral image areas longer than that to the central area, the system compensates for perspective distortion and achieves uniform bottle view sizes throughout the image without requiring complex additional components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides distortion-free, uniformly sized bottle views, improving image quality and simplifying the evaluation process by eliminating converging lines and stray light issues.
Implementation Method 1
a mirror cabinet with several beam paths for deflecting different circumferential side views of a bottle to be checked in the direction of the image areas, with separate deflection mirrors being provided in each beam path
Implementation Method 2
two of the separate deflection mirrors for beam paths assigned to the lateral image areas are tilted relative to a normal of the base plate in such a way that image distortion caused by central projection in the lateral image areas is compensated
Implementation Method 3
In order to be able to inspect the side wall of the bottle down to the base dome in transmitted light
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The device (1) has a mirror chamber with multiple ray paths (SM, SL1, SR1) for diverting different circumferential side views (A-C) of a bottle (3) to be tested toward image areas. Deflecting mirrors (9-14) are provided in the ray paths, and an elevation of the deflecting mirrors is defined with respect to a base plate (23). Two of the separate deflecting mirrors for the ray paths assigned to the lateral image areas are tilted against a normal of the base plate such that an image distortion caused by a central projection is compensated in the lateral image areas.