Seven-Element Optical Imaging Lens for Compact Aberration Control
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Solution Overview
Problem
The challenge is to design an optical imaging lens that balances image quality with a compact, lightweight form factor for portable devices, as increasing the number of lens elements often results in longer lengths that are not suitable for thin devices like smartphones and cameras.
Innovation Solution
A seven-element optical imaging lens configuration with specific surface shapes and materials, including concave and convex portions on lens elements, and satisfying certain optical parameter ratios to ensure image quality and reduce overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of optical imaging lens elements is increased to improve image quality and reduce aberration, then the imaging quality is improved, but the total length of the lens increases
Solution Approach 1:
The lens is divided into seven distinct lens elements with specific surface shapes and optical powers. Each element is optimized for specific aberration correction functions, allowing the system to achieve high imaging quality through distributed correction rather than requiring a single complex element, thereby managing the overall length effectively
Solution Approach 2:
Different lens elements have different surface shapes (convex, concave, aspheric) and material properties (different Abbe numbers) tailored to specific positions in the optical path. For example, the first lens element has a convex object-side surface and concave image-side surface with specific aspheric coefficients, while the second element has opposite characteristics, creating localized optimization that achieves global image quality improvement without uniformly increasing length
2Measurement precision
If the number of optical imaging lens elements is increased to improve image quality, then the color imaging quality is improved, but the total length of the lens increases
Solution Approach 1:
The patent specifies precise parameter relationships between lens elements, including the Abbe number constraint (υ3+υ5≥100.000) and various ratio constraints (e.g., -0.500<f1/f2<0.200, 0.300<T1/T2<2.000). These parameter optimizations enable effective chromatic aberration correction through controlled dispersion characteristics while maintaining a compact overall length
Solution Approach 2:
The lens system uses multiple lens elements made of different materials with different Abbe numbers (dispersion characteristics). The third and fifth lens elements specifically are designed with materials satisfying υ3+υ5≥100.000, creating a composite optical system that corrects color differences through complementary dispersion properties of different materials
3Reliability
If the number of optical imaging lens elements is increased to reduce aberration, then the aberration control is improved, but the total length of the lens increases
Solution Approach 1:
Aberration correction is segmented across multiple lens elements, with each element assigned specific correction functions. The first element addresses spherical aberration through its aspheric surfaces, the second element corrects coma and astigmatism with its negative power and surface shapes, and subsequent elements provide additional correction layers, achieving comprehensive aberration control through distributed functionality
Solution Approach 2:
Multiple lens surfaces utilize aspheric profiles with specific curvature variations. The first lens element's object-side surface has aspheric coefficient values (e.g., A04=0.00150, A06=-0.00020) that correct spherical aberration, while the image-side surface has different coefficients (A04=-0.00200, A06=0.00030) for complementary correction, reducing aberration through controlled surface curvature variations without increasing length
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 shorter total lens length while maintaining high image quality and correcting color differences, making it suitable for thin portable devices with improved aberration control.
Implementation Method 1
Each first lens element, second lens element, third lens element, fourth lens element, fifth lens element, sixth lens element and seventh lens element respectively has an object-side surface which faces toward the object side to allow imaging rays to pass through as well as an image-side surface which faces toward the image side to allow the imaging rays to pass through
Data Source
AI summary
An optical imaging lens includes: first, second, third, fourth, fifth, sixth and seventh lens element, the first lens element has positive refracting power and an image-side surface with a concave portion in a vicinity of its periphery, the second lens element, the sixth lens element and the seventh lens element are made of plastic, the third lens element has an object-side surface with a concave portion in a vicinity of its periphery and an image-side surface with a concave portion in a vicinity of the optical axis, the fourth lens element has an object-side surface with a convex portion in a vicinity of the optical axis, the fifth lens element has an object-side surface with a concave portion in a vicinity of the optical axis. In addition, υ3 and υ5 are the Abbe numbers of the third and the fifth lens element respectively, and satisfying the relationship: υ3+υ5≥100.000.