Seven-Element Optical Imaging Lens Compact System Length
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Solution Overview
Problem
The challenge is to develop an optical imaging lens that maintains good optical performance while being miniaturized, specifically with a shorter system length to accommodate the slimming trend of portable electronic devices like mobile phones and digital cameras, without compromising image quality or field of view.
Innovation Solution
The optical imaging lens is designed with a specific arrangement of seven lens elements, each with unique surface shapes and refracting powers, including convex and concave portions, to optimize image formation and correct aberrations, using aspheric surfaces defined by specific formulas to achieve a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seven-element lens structure is used to maintain good optical performance, then image quality is improved, but system length increases which is detrimental to miniaturization
Solution Approach 1:
The patent applies parameter changes by specifying precise curvature radii, thicknesses, and refractive indices for each lens element. The object-side surface of the third lens element has a convex portion in a vicinity of a periphery with specific curvature characteristics, and the fifth lens element has a convex portion near the optical axis and concave portion near the periphery, allowing optimization of optical performance within a compact form factor
Solution Approach 2:
The patent utilizes complex curved surfaces including aspheric surfaces defined by specific mathematical formulas. The object-side surface of the third lens element has a convex portion in a vicinity of a periphery, and the fifth lens element has both convex and concave portions, enabling better light control and aberration correction in a shorter system length
2Reliability
If lens elements are arranged with specific convex and concave surface shapes to correct aberrations, then optical performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent defines specific parameter ranges for curvature radii (R1 through R7), thicknesses (d1 through d7), and refractive indices (nd1 through nd7) that balance optical performance with manufacturability. These parameters are optimized to achieve good aberration correction while remaining feasible for modern lens manufacturing processes
Solution Approach 2:
The patent applies local quality by giving different surface characteristics to different regions of the lens elements. Specifically, the object-side surface of the third lens element has a convex portion in a vicinity of a periphery, and the fifth lens element has a convex portion in a vicinity of the optical axis and a concave portion in a vicinity of a periphery, allowing targeted aberration correction in specific field regions
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 design achieves a shorter system length while maintaining excellent image quality, correcting aberrations and ensuring good optical performance across various wavelengths, thus addressing the need for miniaturization in portable devices.
Implementation Method 1
each of the first lens element to the seventh lens element has an object-side surface facing the object side and pervious to an imaging ray and an image-side surface facing the image side and pervious to the imaging ray
Data Source
AI summary
An imaging lens includes first, second, third, fourth, fifth, sixth and seventh lens elements arranged in a sequence from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The object-side of the third lens element has a convex portion in a vicinity of a periphery. The object-side of the fifth lens element has a convex portion in a vicinity of the optical axis and a concave portion in a vicinity of a periphery. The object-side of the sixth lens element has a concave portion in a vicinity of a periphery. All of lens elements having refracting power of the imaging lens are the first, second, third, fourth, fifth, sixth and seventh lens elements.’