Seven-Lens Imaging System Aberration Correction
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Solution Overview
Problem
Conventional imaging lenses face challenges in providing high optical performance with a wide field of view and correcting aberrations for both distant and close-range objects, especially when used in devices with large image sensors, while also needing to be compact enough for mobile terminals.
Innovation Solution
The imaging lens configuration includes a specific arrangement of seven lenses with varying refractive powers and aspheric surfaces, along with air gaps between them, optimized to correct spherical, chromatic, and astigmatism aberrations, using plastic materials for mass production feasibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a larger image sensor is used to achieve high resolution imaging, then image quality is improved, but the optical system becomes larger and it becomes difficult to correct various aberrations
Solution Approach 1:
The optical system is divided into seven individual lens elements with specific refractive powers and surface shapes. Each lens element is optimized to contribute to overall aberration correction, allowing the system to achieve high resolution on large image sensors while maintaining a compact form factor through distributed correction across multiple segments.
Solution Approach 2:
Different lens elements are assigned specific local functions: the first lens with positive refractive power corrects spherical aberration, the third and seventh lenses with negative refractive power correct chromatic and astigmatism aberrations, and the fourth and sixth aspheric lenses provide localized correction in specific regions. This local optimization allows effective aberration correction across the entire large image sensor area.
2Adaptability or versatility
If the lens is designed to provide a wide field of view, then viewing angle is improved, but correction of aberrations becomes very difficult particularly in the peripheral area
Solution Approach 1:
The fourth and sixth lens elements are designed with aspheric surfaces instead of simple spherical surfaces. These aspheric surfaces provide enhanced correction capability for wide field of view applications, particularly correcting aberrations in the peripheral areas that would be difficult to correct with conventional spherical surfaces alone.
Solution Approach 2:
The lens system employs specific parameter relationships: the third lens has negative refractive power with a focal length ratio f3/f within a specific range to correct chromatic and astigmatism aberrations, and the seventh lens also has negative refractive power to correct distortion. These parameter optimizations enable effective aberration correction across the wide field of view.
3Adaptability or versatility
If high optical performance is ensured in both imaging of an object at infinity and imaging of an object at close range, then autofocus capability is improved, but this becomes very difficult particularly when the image sensor is large
Solution Approach 1:
The seven-lens optical system is designed to perform multiple functions simultaneously: it corrects spherical aberration, chromatic aberration, astigmatism, and distortion across the entire field of view, while maintaining high resolution on large image sensors and enabling both infinity and close-range imaging. This multi-functional design allows the system to achieve high optical performance for autofocus applications without requiring separate optimization for different object distances.
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 achieves higher optical performance and corrects various aberrations effectively, providing a compact design suitable for both small and large image sensors, enhancing image quality across different distances and field views.
Implementation Method 1
a first lens with positive refractive power, a second lens with positive or negative refractive power, a third lens with negative refractive power, a fourth lens with positive or negative refractive power as a double-sided aspheric lens, a meniscus fifth lens having a convex surface on the image side, a sixth lens with positive or negative refractive power as a double-sided aspheric lens, and a seventh lens with negative refractive power
Data Source
AI summary
An imaging lens which uses a larger number of constituent lenses for higher performance and features compactness and a wide field of view. The imaging lens is composed of seven lenses to form an image of an object on a solid-state image sensor. The constituent lenses are arranged in the following order from an object side to an image side: a first lens with positive refractive power; a second lens with positive or negative refractive power; a third lens with negative refractive power; a fourth lens with positive or negative refractive power as a double-sided aspheric lens; a meniscus fifth lens having a convex surface on the image side; a sixth lens with positive or negative refractive power as a double-sided aspheric lens; and a seventh lens with negative refractive power, in which an air gap is provided between lenses.