Nine-Element Optical Imaging Lens Balancing Resolution and System Length
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Solution Overview
Problem
The design of optical imaging lenses for portable electronic devices faces challenges in achieving a larger aperture stop, increased image height, and higher resolution while maintaining a compact system length, which is complicated by the need for more lens elements and improved imaging quality.
Innovation Solution
An optical imaging lens with nine lens elements, each with specific surface shapes and refracting powers, including concave and convex regions, is designed to satisfy certain optical relationships, allowing for a larger aperture stop, enhanced resolution, and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more lens elements are added to increase resolution and image height, then imaging quality and pixel demands are met, but system length increases and compactness is compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Abbe numbers of specific lens elements (ν5+ν9≤100.000, ν8+ν9≤100.000) and optimizing surface curvatures (concave/convex regions) to achieve high resolution with a compact nine-element system, resolving the contradiction between resolution and system length
Solution Approach 2:
The patent implements local quality by designing specific concave and convex regions on lens surfaces (e.g., periphery region of object-side surface of fourth lens element is concave, optical axis region of image-side surface is convex) to optimize light path control and imaging quality while maintaining compact system length
2Area of stationary object
If aperture stop is enlarged to receive more imaging rays, then image height and pixel demands are met, but design complexity increases
Solution Approach 1:
The patent manages design complexity by establishing specific parameter relationships (ν5+ν9≤100.000, Fno*AA15/T2≤6.000) that guide the optimization process, allowing for larger aperture stop while maintaining manageable design complexity through systematic parameter control
3Area of stationary object
If more lens elements are added to increase image height, then pixel demands are met, but system complexity and difficulty of design increase
Solution Approach 1:
The patent reduces system complexity by defining specific parameter constraints (ν5+ν9≤100.000, ν8+ν9≤100.000, 2.700≤(ImgH+EPD)/(D12t32+D41t62)) that systematically guide the design of a nine-element lens achieving large image height while controlling overall system complexity
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 nine-element lens design achieves a larger aperture stop, increased image height, and higher resolution while maintaining good imaging quality, addressing the challenges of compactness and performance in portable electronic devices.
Implementation Method 1
Each one of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element and the ninth 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 ninth lens element from an object side to an image side along an optical axis and each lens element has an object-side surface and an image-side surface. A periphery region of the object-side surface of the fourth lens element is concave, an optical axis region of the image-side surface of the fourth lens element is convex, an optical axis region of the object-side surface of the seventh lens element is concave, an optical axis region of the image-side surface of the eighth lens element is concave, and an optical axis region of the object-side surface of the ninth lens element is concave. Lens elements included by the optical imaging lens are only nine lens elements described above. An Abbe number of the fifth lens element ν5 and an Abbe number of the ninth lens element ν9 satisfy ν5+ν9≤100.000.