Seven-Lens Optical Imaging Layout for Short System Length
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Solution Overview
Problem
The challenge lies in designing an optical imaging lens for portable electronic devices that achieves a small f-number, larger image height, and higher resolution while maintaining a shorter system length, which is complicated by the need to incorporate more lens elements within a limited space.
Innovation Solution
An optical imaging lens comprising seven lens elements with specific surface shapes and refractive powers, including concave and convex regions, that satisfy certain optical relationships to achieve a small f-number, larger image height, and shorter system length while maintaining good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more lens elements are added to increase resolution and handle larger image height, then imaging quality and pixel reception improve, but system length increases and device compactness deteriorates
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific positive and negative refractive powers arranged in a +−++−+− configuration. Each lens element is designed with specific surface shapes (concave/convex regions) to handle different portions of the optical path, allowing the system to achieve high resolution while maintaining a compact overall length through optimized segmentation of optical functions
Solution Approach 2:
The seven lens elements are nested within a compact optical barrel structure, with each element positioned closely to its neighbors. The design allows the lens elements to be arranged in a space-efficient manner where the optical path is folded and compressed, enabling more lens elements to fit within a shorter system length through nested spatial arrangement
2Measurement precision
If more lens elements are added to achieve larger image height for more pixels, then imaging quality improves, but device complexity increases
Solution Approach 1:
Different regions of the lens elements (optical axis region vs. periphery region) are designed with different surface shapes and refractive properties. Specifically, certain lens elements have concave optical axis regions and convex periphery regions, or vice versa, allowing each local region to optimize for its specific function while contributing to overall high imaging quality across the entire image height
Solution Approach 2:
The patent specifies precise parameter ranges for lens element properties including refractive power signs (+/−), surface curvature configurations (concave/convex regions), and relative position relationships. By carefully controlling these parameters within specified ranges, the system achieves high imaging quality without requiring excessive complexity in the overall design
3Illumination intensity
If f-number is reduced to receive more imaging rays, then light gathering capability improves, but design difficulty increases due to aberration control challenges
Solution Approach 1:
The patent converts the potential harm of reduced f-number (which typically causes increased aberrations) into a benefit by using the small f-number to gather more light, while simultaneously using the seven-element design with specific positive and negative power combinations to correct the resulting aberrations. The concave and convex region configurations in specific lens elements are designed to counterbalance the aberrations introduced by the small f-number
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 effectively addresses the design challenges by providing an optical imaging lens with a small f-number, larger image height, and higher resolution within a compact form factor, ensuring good imaging quality.
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 a first lens element to a seventh lens element; each lens element has an object-side surface and an image-side surface. A periphery region of the image-side surface of the third lens element is concave, an optical axis region of the object-side surface of the fourth lens element is concave, the fifth lens element has negative refracting power, an optical axis region of the object-side surface of the seventh lens element is convex, and a periphery region of the object-side surface of the seventh lens element is concave. Lens elements included by the optical imaging lens are only seven lens elements described above to satisfy 2.200≤(T1+D42t72)/(Fno*D12t32) and 115.000≤ν3+ν4+ν5.