Lens Edge Part Annular Indices for Eccentricity Detection
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Solution Overview
Problem
Conventional techniques for assembling optical lenses in imaging devices, such as those in mobile phones, face challenges in achieving high precision and accuracy due to issues like eccentricity and decentering, which require labor-intensive measurement and adjustment processes, hindering productivity and optical performance.
Innovation Solution
A lens design featuring annular grooves or projected portions on the edge part, which allows for easy evaluation of dimensional accuracy by observing these features with parallel light, facilitating the detection of eccentricity and enabling precise control of lens surfaces without the need for extensive measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement methods (AFM, atomic force microscope) are used to measure lens surface accuracy, then measurement precision is improved, but productivity deteriorates due to enormous measurement efforts and time consumption
Solution Approach 1:
The patent replaces complex mechanical measurement systems (AFM, atomic force microscope) with a simple optical observation method. By projecting parallel light onto the lens surface and observing the reflected light pattern, the measurement process is transformed from mechanical contact measurement to optical non-contact observation, dramatically reducing measurement time and effort while maintaining accuracy evaluation capability
Solution Approach 2:
The lens structure itself serves the measurement function through its edge part geometry. The edge part with specific angular range (30-150 degrees) automatically generates observable light reflection patterns that directly indicate surface accuracy, eliminating the need for external complex measurement equipment and making the lens self-indicating its quality
2Manufacturing precision
If meticulous measurement and evaluation are performed for each molding lot to control eccentricity, then manufacturing precision is improved, but productivity deteriorates due to enormous measurement efforts
Solution Approach 1:
The patent replaces meticulous mechanical measurement procedures for eccentricity detection with a simple optical observation method. By observing the light reflection pattern from the edge part, operators can quickly evaluate whether the lens surface is concentric with the edge part, enabling rapid quality assessment without time-consuming mechanical measurements
Solution Approach 2:
The edge part is designed with specific geometric features (angular range of 30-150 degrees relative to optical axis) during the molding process itself, preparing the lens structure in advance to enable easy eccentricity detection. This preliminary structural preparation allows for quick quality verification without requiring complex post-processing measurement setups
3Manufacturing precision
If molding conditions are reviewed or reset when evaluation results are unsatisfactory, then manufacturing precision is improved, but productivity deteriorates due to process interruptions
Solution Approach 1:
The patent implements immediate visual feedback through the light reflection observation method. Operators can observe the concentricity of the lens surface with the edge part in real-time or near-real-time, allowing for rapid identification of molding issues. This quick feedback loop enables prompt corrective actions without lengthy measurement delays, maintaining both quality and productivity
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 approach simplifies the evaluation and control of lens accuracy, improving productivity by allowing visual determination of eccentricity and ensuring high-dimensional accuracy, thus enhancing the optical performance of imaging devices.
Implementation Method 1
when parallel light is projected to the edge part, the annular indices formed on both the surfaces of the edge part can be observed
Data Source
AI summary
A lens is provided which is configured so that the dimensional accuracy of the lens surface can be evaluated easily and accurately, and the control of the accuracy of the lens can be easily performed. The lens comprises a lens effective part having lens surfaces formed around an optical axis as the center and an edge part in a doughnut shape as viewed in a plan view, which is extended along the outer periphery of the lens effective part. The edge part and the lens effective part are molded simultaneously, and annular indices around the optical axis as the center, with which the dimensional accuracy of the lens surfaces can be detected, are formed on both the surfaces of the edge part.