Nine-Element Optical Imaging Lens for Compact High-Performance Systems
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Solution Overview
Problem
Optical imaging lenses face challenges in achieving a balance between being compact, lightweight, and providing good imaging quality with a large image height and small f-number, while maintaining a short system length.
Innovation Solution
The design of an optical imaging lens comprising nine specific lens elements with carefully configured refracting powers and surface shapes, including negative and positive refracting powers, concave and convex regions, to meet the condition ImgH/Fno≥2.700 mm, ensuring a short system length, large image height, and small f-number with good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of optical lens elements is increased to improve imaging quality, then aberration and chromatism are reduced, but the distance between the object-side surface of the first lens element and the image plane increases, making the lens system longer and less compact
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, Abbe numbers, and curvature radii of each lens element. Specific parameter ranges are defined for each of the nine lens elements (e.g., refractive index between 1.45-1.75, Abbe number between 20-60) to optimize the optical path and reduce aberrations while maintaining a compact form factor. This systematic parameter optimization allows the lens to achieve good imaging quality without requiring excessive element count or length.
Solution Approach 2:
The patent implements local quality by assigning different refractive indices and Abbe numbers to different lens elements based on their specific positions and functions in the optical path. Each lens element is tailored with specific material properties (e.g., first lens element with refractive index 1.50-1.65, second with 1.60-1.75) to address local optical requirements, allowing effective aberration correction throughout the system while maintaining overall compactness.
2Illumination intensity
If a small f-number is designed to increase light amount, then more light is captured for better night shooting, but the lens structure becomes more complex and system length increases
Solution Approach 1:
The patent achieves a small f-number (Fno ≤ 1.8) by optimizing the aperture diameter to focal length ratio through precise parameter control of each lens element. The conditional expressions (e.g., 0.30 < f/FL < 0.50, where f is focal length and FL is lens length) guide the parameter selection to maximize light gathering capability while constraining the overall system length to remain compact.
Solution Approach 2:
The patent employs dynamic optical design where the nine lens elements are arranged with specific spacing relationships (conditional expressions involving distances between elements) to dynamically control light paths. This allows the system to maintain a small effective f-number for maximum light intake while the physical lens barrel remains compact through optimized element positioning.
3Area of stationary object
If a large image height is designed to increase pixel size, then night shooting capability is improved, but the lens system becomes larger and less compact
Solution Approach 1:
The patent achieves large image height (ImgH ≥ 3.5 mm) by optimizing the field of view and image circle through precise control of lens curvatures and spacing. The conditional expressions (e.g., ImgH/Fno ≥ 2.700 mm) establish the relationship between image height and f-number, ensuring that the large image height required for big pixels is achieved without proportionally increasing system length, thus maintaining compactness.
4Weight of stationary object
If the lens is designed to be lightweight and compact, then portability is improved, but imaging quality and aberration control become more difficult
Solution Approach 1:
The patent achieves lightweight and compact design by selecting lens materials with appropriate densities and optimizing the physical dimensions of each element. The conditional expressions constrain the size and material properties (refractive index, Abbe number ranges) to minimize weight and volume while the nine-element configuration with optimized spacing maintains effective aberration correction and imaging quality despite the reduced scale.
Solution Approach 2:
The patent applies local quality by assigning specific material properties and geometric parameters to each of the nine lens elements based on their position in the optical path. This localized optimization allows the compact lens to achieve uniform aberration control across the entire image field, ensuring high imaging quality throughout the compact structure rather than sacrificing quality for size.
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 configuration allows for a compact optical imaging lens with improved imaging quality, reduced spherical and chromatic aberrations, and enhanced image height, meeting the requirements of modern imaging devices like mobile phones and digital cameras.
Implementation Method 1
Each of the first lens element to the ninth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens includes first to ninth lens elements sequentially arranged along an optical axis from an object side to an image side. Each of the first lens element to the ninth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. The second lens element has negative refracting power. The fifth lens element has negative refracting power and a periphery region of the object-side surface of the fifth lens element is concave. An optical axis region of the object-side surface of the sixth lens element is concave. The seventh lens element has negative refracting power. Lens elements of the optical imaging lens are only the nine lens elements described above to meet a condition ImgH/Fno≥2.700 mm.