Nine-Element Optical Imaging Lens Balancing Image Quality and Length
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Solution Overview
Problem
Existing optical imaging lenses for portable devices face challenges in achieving a balance between being light, thin, and short while maintaining good imaging quality, large image height, and small f-number, which are essential for improved performance and night shooting capabilities.
Innovation Solution
The optical imaging lens design consists of nine lens elements with specific refracting powers and surface shapes, including concave and convex regions, adhering to certain optical conditions to optimize imaging quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of optical lens elements is increased to improve imaging quality, then imaging quality is improved, but the distance from the object-side surface to the image plane increases, which is not conducive to thinness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, Abbe numbers, and focal lengths of each lens element. The ninth lens element has a specific refractive index range (1.50-1.70) and Abbe number range (20.00-40.00), and the optical system satisfies specific conditional expressions for focal lengths and distances, optimizing the optical path to achieve good imaging quality with a shorter overall length
Solution Approach 2:
The patent uses composite material principles by combining lens elements made of different materials with varying refractive indices and Abbe numbers. The nine lens elements are made from different optical materials selected to correct chromatic aberration and spherical aberration, achieving superior imaging quality through material composition optimization
2Use of energy by moving object
If the f-number is reduced to increase light flux, then light flux is increased, but the lens complexity increases
Solution Approach 1:
The patent achieves a small f-number (Fno≥1.50) by optimizing parameters including the focal length of each lens element, the air gaps between elements, and the refractive indices. The conditional expressions for focal lengths (e.g., 0.100≤f9/EFL≤0.500) and distances are carefully controlled to maximize light flux while managing system complexity
3Area of stationary object
If the image height is increased to enlarge pixel size, then pixel size is increased, but the lens length increases
Solution Approach 1:
The patent optimizes the image height (0.50mm≤ImgH≤3.00mm) by adjusting the focal length of the ninth lens element and the back focal length (BFL). The conditional expressions control the relationship between image height, focal length, and lens element positions to achieve larger pixel sizes within a compact form factor
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 improved imaging quality with a large image height and small f-number, enhancing performance and night shooting capabilities while maintaining a compact form factor.
Implementation Method 1
Each of the first lens element, second lens element, third lens element, fourth lens element, fifth lens element, sixth lens element, seventh lens element, eighth lens element and 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. The second lens element has negative refracting power or the third lens element has positive refracting power, a periphery region of the image-side surface of the second lens element is concave, the fourth lens element has negative refracting power, the sixth lens element has negative refracting power, an optical axis region of the image-side surface of the seventh lens element is concave, and an optical axis region of the image-side surface of the ninth lens element is concave. Lens elements included by the optical imaging lens are only nine lens elements described above to satisfy (V5+V6+V7)/(V3+V4)≥1.100.