Seven-Lens Optical Imaging Lens Aberration Control
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving a large field of view while maintaining good imaging quality and a short lens length, as increasing the number of lens elements to achieve this goal leads to increased thickness and complexity.
Innovation Solution
The design of a seven-lens optical imaging lens with specific surface configurations and refracting powers, including concave and convex regions on the lens elements, and satisfying conditional expressions such as SG5G6/(G45+T5)≥2.600, DG5G6/(T4+G45)≥1.900, and DT2G5/(T6+T7)≥4.000, to optimize field of view and lens length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of optical lens elements is increased to achieve a large field of view and good imaging quality, then the imaging quality and field of view are improved, but the lens length and thickness increase
Solution Approach 1:
The patent applies local quality by giving different surface configurations to different regions of the lens elements. Specifically, the first lens element has a concave optical axis region on its image-side surface, the second lens element has a concave periphery region on its object-side surface and a convex optical axis region on its image-side surface, and the seventh lens element has a concave optical axis region on its image-side surface. These localized surface variations allow each lens element to contribute differently to aberration correction, improving overall imaging quality without requiring additional lens elements that would increase lens length.
2Adaptability or versatility
If the number of optical lens elements is increased to achieve a large field of view, then the field of view is improved, but the lens thickness increases
Solution Approach 1:
The patent employs parameter changes by carefully controlling the refracting powers and surface curvatures of each lens element. The conditional expressions (1) through (7) define specific parameter ranges for air gaps (G12, G23, G34, G45, G56, G67), lens thicknesses (T1 through T7), and refracting powers (f1 through f7) that enable a large field of view (65 degrees or more) while keeping the total lens thickness within acceptable limits. For example, the air gap G56 between the fifth and sixth lens elements is specifically controlled to optimize the balance between field of view and lens compactness.
3Measurement precision
If the number of optical lens elements is increased to achieve good imaging quality, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The patent applies merging by combining multiple functions into fewer lens elements. Each of the seven lens elements is designed with specific surface configurations (concave or convex regions) that allow a single element to perform multiple optical functions such as focusing, aberration correction, and field curvature control. For instance, the second lens element with its concave periphery region on the object-side surface and convex optical axis region on the image-side surface simultaneously contributes to spherical aberration correction and field of view expansion, reducing the need for additional dedicated correction elements.
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 allows for a large field of view and short lens length while maintaining good imaging quality, with improved spherical and chromatic aberration control, and enhanced manufacturing feasibility.
Implementation Method 1
Each of the first lens element to the seventh lens element includes an object-side surface facing the object side and allowing imaging rays to pass through, and an image-side surface facing the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element arranged in sequence from an object side to an image side along an optical axis, is provided. Each of the first lens element to the seventh lens element includes an object-side surface and an image-side surface. An optical axis region of the image-side surface of the first lens element is concave. A periphery region of the object-side surface of the second lens element is concave and an optical axis region of the image-side surface of the second lens element is convex. The seventh lens element has negative refracting power and an optical axis region of the image-side surface of the seventh lens element is concave.