Eight-Element Optical Imaging Lens for Short Length and Large Image Height
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Solution Overview
Problem
The challenge lies in designing an optical imaging lens that is thin, light, short, with a small f-number, large image height, and high resolution while maintaining good imaging quality, which is not adequately addressed by existing technologies.
Innovation Solution
The optical imaging lens is designed with eight lens elements, featuring specific refracting power configurations and surface shapes, including concave and convex regions on object-side and image-side surfaces, and adhering to specific optical relationships such as (EFL+AAG)/ALT≥2.200, to achieve the desired characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the optical imaging lens is designed to be thin and short, then the lens structure is more compact and suitable for portable devices, but the image height and field of view are reduced
Solution Approach 1:
The optical imaging lens is divided into eight lens elements with different refracting powers and surface shapes. Each lens element contributes to specific optical functions, allowing the system to achieve compact length while maintaining adequate image height through distributed optical power across multiple segments
Solution Approach 2:
The patent employs complex multi-region surface shapes (optical axis regions and periphery regions with different curvatures) on lens elements to control light paths in multiple dimensions, enabling compact lens length while preserving image height and field of view through sophisticated ray bending in different spatial zones
2Illumination intensity
If the f-number is reduced to increase luminous flux, then more light reaches the image sensor, but the lens structure becomes more complex and difficult to manufacture
Solution Approach 1:
Different regions of the lens elements (optical axis regions and periphery regions) are designed with different surface shapes and refracting powers optimized for their specific functions. The periphery regions have convex shapes to expand field of view and control off-axis light, while optical axis regions have concave shapes for on-axis light control, allowing small f-number achievement without excessive manufacturing complexity
Solution Approach 2:
The lens elements employ aspheric surfaces with different curvatures in optical axis and periphery regions. These curved surfaces efficiently guide light rays to achieve small f-number and high luminous flux while maintaining manufacturability through standardized aspheric manufacturing processes
3Area of stationary object
If the image height is increased to improve pixels and resolution, then the image sensor can receive more imaging rays, but the lens becomes larger and heavier
Solution Approach 1:
The optical system is segmented into eight lens elements, each contributing to image height expansion through controlled light bending. This segmentation allows the lens to achieve large image height without requiring a single large, heavy element, thereby reducing overall weight while maintaining resolution capabilities
Solution Approach 2:
The patent uses multi-region surface designs that manipulate light paths in complex three-dimensional space. By controlling ray trajectories through different surface zones, the system achieves large image height and high resolution without proportionally increasing lens weight, as the optical power is distributed efficiently across multiple elements rather than concentrated in one heavy component
4Reliability
If the lens is designed with multiple elements to improve imaging quality, then aberration correction is enhanced, but the lens becomes more complex and longer
Solution Approach 1:
Each lens element is designed with locally optimized surface shapes for specific functions: convex periphery regions for field of view expansion and off-axis aberration control, concave optical axis regions for on-axis light control. This localized optimization achieves superior imaging quality and aberration correction while keeping each element relatively simple and the overall lens compact
Solution Approach 2:
The optical system is divided into eight lens elements with alternating positive and negative refracting powers. This segmentation allows systematic correction of different types of aberrations at different stages of light propagation, achieving high imaging quality while managing complexity through modular element design with standardized manufacturing approaches
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 results in an optical imaging lens that meets the requirements of being thin, light, short, with a small f-number, and large image height, while providing excellent imaging quality and aberration correction.
Implementation Method 1
the third lens element has positive refracting power, the periphery region of the object-side surface of the third lens element is concave, the optical axis region of the object-side surface of the fifth lens element is concave
Data Source
AI summary
An optical imaging lens includes a first lens element to an eighth lens element from an object side to an image side along an optical axis. The third lens element has positive refracting power, and a periphery region of the object-side surface of the third lens element is concave, an optical axis region of the object-side surface of the fifth lens element is concave, a periphery region of the object-side surface of the eighth lens element is convex, and an optical axis region of the image-side surface of the eighth lens element is concave. Lens elements included by the optical imaging lens are only eight lens elements described above to satisfy (EFL+AAG)/ALT≥2.200.