Evaluation Chart for Imaging Optical System Eccentricity Adjustment
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Solution Overview
Problem
Existing methods for evaluating imaging optical systems using charts face challenges in accurately assessing performance due to errors introduced when switching high-accuracy charts, which can lead to incorrect evaluations of the imaging optical system.
Innovation Solution
A chart with a specific pattern featuring closed regions with circular bright portions and surrounding dark portions, arranged radially around a central region, is used to comprehensively evaluate the imaging optical system by capturing images and displaying them in multiple areas for adjustment of eccentricity, inclination, and flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flat plate chart with predetermined pattern is used to evaluate imaging optical system, then the evaluation process can be simplified, but errors are introduced when switching high-accuracy charts leading to incorrect evaluations
Solution Approach 1:
The chart is divided into multiple closed regions with specific patterns (bright portions surrounded by dark portions) that can be independently evaluated. Each closed region represents a separate evaluation unit, allowing comprehensive assessment of different areas of the imaging optical system without requiring chart switching.
Solution Approach 2:
The chart pattern is designed to serve multiple evaluation functions simultaneously - it can assess contrast, shape, and other optical properties through the various closed regions. This multi-functional design eliminates the need for multiple separate charts or repeated chart switching, thereby maintaining both operational simplicity and measurement precision.
2Adaptability or versatility
If multiple charts are used to comprehensively evaluate imaging optical system, then evaluation coverage is improved, but chart switching errors increase
Solution Approach 1:
Multiple evaluation patterns that would traditionally require separate charts are merged into a single chart structure. The chart includes multiple closed regions with different patterns (some with bright portions, some without) that can be evaluated simultaneously in one capture, providing comprehensive evaluation coverage without the reliability issues of chart switching.
Solution Approach 2:
The chart transitions from a single-pattern design to a multi-region design where different evaluation targets are arranged in spatial dimensions. This allows the chart to provide diverse evaluation coverage (different closed regions) while maintaining reliability by eliminating the need to switch between separate chart plates.
3Ease of manufacture
If traditional chart patterns are used, then manufacturing is simple, but the chart cannot provide comprehensive evaluation of contrast and shape
Solution Approach 1:
Different regions of the chart have different local qualities - some closed regions contain bright portions surrounded by dark portions for contrast evaluation, while others have different pattern configurations for shape evaluation. This local differentiation allows comprehensive evaluation precision while maintaining overall manufacturing simplicity through a systematic pattern design.
Data Source
AI summary
A chart has a chart pattern for evaluation of an imaging optical system. The chart pattern includes a plurality of closed regions having the same shape including two orthogonal sides in a contour thereof. Each of the plurality of closed regions includes a bright portion having a circular shape and a dark portion surrounding the bright portion. The plurality of closed regions includes a central closed region arranged at a center of the chart pattern and a plurality of peripheral closed regions arranged radially from the center on concentric circles about the center.