Five-Lens Optical Imaging Lens Compact Design
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving a balance between short system length, good imaging quality, and zoom-in functionality while maintaining effective optical performance.
Innovation Solution
A five-lens element optical imaging lens design with specific surface shapes and refracting powers, including convex and concave regions on lens elements, and strategically placed air gaps, which satisfies a set of optical conditions to optimize system length and imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional optical imaging lens design is used, then imaging quality can be maintained, but the system length becomes too long and zoom-in function is limited
Solution Approach 1:
The optical imaging lens is divided into five distinct lens elements, each with specific refracting powers and surface shapes. This segmentation allows each element to contribute differently to the overall optical function, enabling compact design while maintaining imaging quality. The first lens element has positive refracting power with convex object-side surface, the second has negative refracting power, the third has positive refracting power with concave object-side surface, the fourth has negative refracting power, and the fifth has positive refracting power with convex object-side surface and convex periphery region on image-side surface.
Solution Approach 2:
Different regions of the lens elements have different surface shapes and refracting properties. Specifically, the periphery region of the image-side surface of the fifth lens element is convex, while the optical axis region has positive refracting power. This local differentiation allows the lens to control both central and peripheral light rays effectively, reducing aberrations and maintaining imaging quality in a compact form factor.
2Length of moving object
If the system length is reduced, then compactness is improved, but optical performance and imaging quality deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element to optimize optical performance within a compact system. The conditional expressions define specific relationships between effective focal length (EFL), system length (TTL), lens thicknesses (T1-T5), and air gaps (G12, G23, G34, G45). For example, 0.25 < T1/(G23+G34+G45) < 0.50 and 0.40 < (T1+G12)/(T4+T5) < 0.80 ensure that the compact design maintains proper optical performance by controlling the distribution of optical power and spacing between elements.
3Reliability
If more lens elements are added to improve imaging quality, then device complexity increases
Solution Approach 1:
The patent enables zoom-in functionality through the dynamic arrangement of the five lens elements. The specific configuration with alternating positive and negative refracting powers allows the lens system to adjust its effective focal length, providing zoom capability. The convex periphery region on the image-side surface of the fifth lens element further enhances this dynamic performance by controlling off-axis light rays, enabling both compactness and variable magnification without excessive 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 design achieves a shorter system length while maintaining excellent imaging quality and zoom-in functionality, reducing aberrations such as spherical and field curvature, and improving manufacturing efficiency.
Implementation Method 1
Each first lens element, second lens element, third lens element, fourth lens element and fifth lens element respectively 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 fifth lens element from an object side to an image side in order along an optical axis, and each lens element has an object-side surface and an image-side surface. An optical axis region of the image-side surface of the first lens element is concave, 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 fifth lens element is convex. EFL is an effective focal length of the optical imaging lens and TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis to satisfy 1.1≤EFL/TTL≤1.6.