Six-Lens Optical Imaging Lens Design for Wide-Angle High Image Height
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Solution Overview
Problem
Designing an ultra-wide-angle optical imaging lens for portable electronic devices that maintains a large image height while ensuring system length, lens injection molding, and assembly yield is challenging due to the increased thickness ratio of the optical axis to the periphery of lens elements, affecting imaging quality and manufacturing efficiency.
Innovation Solution
A six-lens element optical imaging lens design with specific surface shapes and refracting powers, including concave and convex regions, and the strategic placement of an aperture stop and light-shielding sheet, to enhance the half field of view and modulation transfer function while maintaining system length and improving injection molding and assembly yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the refractive power of lens elements is increased to achieve larger image height in ultra-wide-angle design, then the image height is improved, but the thickness ratio of the optical axis to the periphery region increases which affects injection molding and assembly yield
Solution Approach 1:
The patent applies local quality by designing different surface regions of lens elements with different curvatures. Specifically, the object-side surface of each lens element has a first curvature in the optical axis region and a second curvature in the periphery region, allowing each region to be optimized independently for its specific function while maintaining overall system performance
Solution Approach 2:
The patent changes the curvature parameters of lens element surfaces to resolve the contradiction. By adjusting the first and second curvatures of different regions, the design achieves appropriate thickness distribution that maintains both large image height and favorable injection molding characteristics
2Area of stationary object
If the thickness ratio of the optical axis to the periphery region is increased to achieve larger image height, then the image height is improved, but the system length increases which is not desirable for portable devices
Solution Approach 1:
The patent uses local quality by assigning different curvature characteristics to different regions of the lens elements. The optical axis region and periphery region have different curvatures that are independently optimized, allowing the system to achieve large image height without proportionally increasing the overall system length
Solution Approach 2:
The patent extensively uses curvature variations in the lens element surfaces. Each lens element's object-side and image-side surfaces have specific curvature radii that are optimized to control light paths efficiently, achieving compact system length while maintaining large image height capability
3Measurement precision
If more lens elements are added to improve imaging quality and half field of view, then the modulation transfer function is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing each lens element to serve multiple functions. The six lens elements collectively achieve wide-angle imaging, aberration correction, and compact form factor simultaneously, reducing the need for additional specialized components
Solution Approach 2:
The patent uses segmentation by dividing the optical system into six distinct lens elements with specific refractive powers and surface curvatures. Each element is optimized for specific aberration corrections and imaging functions, allowing complex optical performance to be achieved through modular design
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 design achieves a larger half field of view and higher image height with improved modulation transfer function, while maintaining system length and enhancing lens injection molding and assembly yield, thus addressing the challenges of existing ultra-wide-angle lens designs.
Implementation Method 1
Each first lens element, second lens element, third lens element, fourth lens element, fifth lens element and sixth lens element has an object-side surface which faces toward the object side and allows imaging rays to pass through as well as an image-side surface which faces toward the image side and allows the imaging rays to pass through
Data Source
AI summary
An optical imaging lens includes a first lens element to a sixth lens element from an object side to an image side along an optical axis. An optical axis region of the object-side surface of the first lens element is concave, a periphery region of the object-side surface of the second lens element is convex, a periphery region of the image-side surface of the fourth lens element is concave, an optical axis region of the object-side surface of the fifth lens element is convex and a periphery region of the image-side surface of the sixth lens element is convex. Lens elements included by the optical imaging lens are only six lens elements described above. ImgH is an image height of the optical imaging lens and AAG is a sum of five air gaps from the first lens element to the sixth lens element along the optical axis to satisfy ImgH/AAG≥3.200.