Six-Lens Optical System for Compact Aberration Correction
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Solution Overview
Problem
The challenge of miniaturizing camera lenses in electronic devices is hindered by their large size, which contradicts the trend towards smaller electronic devices.
Innovation Solution
An optical system comprising a specific arrangement of lenses with positive and negative refractive powers, including aspherical surfaces, and adhering to certain relational expressions to optimize size and performance, such as 0.60<CT1/SD11<1.01 and 5.5<TTL/CT1<9.0, along with the use of plastic or glass lenses to reduce weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camera lens uses conventional design with multiple lenses, then the optical performance is improved, but the overall size becomes large
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refractive power configurations (positive, negative, and mixed). Each lens element is optimized for specific optical functions, allowing the system to achieve high optical performance while maintaining a compact overall structure through functional segmentation of the optical path.
Solution Approach 2:
The patent introduces specific geometric constraints on lens surface curvatures (convex at center, concave at circumference) and establishes precise mathematical relationships between lens parameters (CT1/SD11 ratio, TTL/CT1 ratio). These dimensional constraints enable compact packaging of the optical system by optimizing the spatial arrangement and curvature profiles of each lens element.
2Volume of moving object
If the camera lens is miniaturized, then the electronic device size is reduced, but the optical performance deteriorates
Solution Approach 1:
Different regions of each lens element are designed with different curvature characteristics (convex at center, concave at circumference). This local quality variation allows each lens to correct specific types of optical aberrations in different field regions, maintaining high imaging quality across the entire image plane while keeping the lens elements compact.
Solution Approach 2:
The patent establishes specific parameter ranges and relationships (0.60<CT1/SD11<1.01, 5.5<TTL/CT1<9.0, refractive power distributions) that optimize the balance between lens size and optical performance. By carefully controlling these parameters, the system achieves miniaturization without sacrificing imaging quality.
3Reliability
If the lens surfaces are made complex to reduce aberrations, then the optical performance is improved, but the manufacturing difficulty increases
Solution Approach 1:
The patent employs aspherical surface designs with specific curvature profiles (convex at center, concave at circumference) rather than simple spherical surfaces. These controlled aspherical shapes effectively reduce optical aberrations while maintaining manufacturability through standardized molding processes for plastic lenses or precision grinding for glass lenses.
Solution Approach 2:
The optical system uses a combination of plastic and glass lens materials, each selected for specific optical properties and manufacturability. Plastic lenses allow for cost-effective mass production with complex aspherical surfaces, while glass lenses provide superior optical clarity and stability for critical elements, creating a composite material strategy that balances performance and manufacturing ease.
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
The solution achieves a compact camera lens design that meets miniaturization requirements while maintaining excellent optical performance and imaging quality, with improved yield rates and reduced aberrations.
Implementation Method 1
an optical system, sequentially arranged from an object side to an image side, includes: a first lens L1 having a positive refractive power; a second lens L2 having a refractive power; a third lens L3 having a negative refractive power
Data Source
AI summary
An optical system includes a first lens having a positive refractive power; a second lens having a refractive power; a third lens having a negative refractive power and an object side surface and an image side surface being concave at circumferences; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power and an object side surface and an image side surface being aspherical, and at least one of the object side surface and the image side surface having an inflection point; and a sixth lens having a negative refractive power. 0.60<CT1/SD11<1.01; 5.5<TTL/CT1<9.0; CT1 is a thickness of the first lens, SD11 is half of a maximum effective aperture of an object side surface of the first lens, TTL is a distance from the object side surface of the first lens to an imaging plane.