Five-Lens Optical Imaging Assembly for Low-Light Aperture Optimization
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Solution Overview
Problem
Existing optical imaging lens assemblies for portable electronic products face challenges in ensuring high image quality under insufficient lighting conditions due to limited light transmission, as they typically have an F-number of 2.0 or more, which is insufficient for capturing clear images in dark environments.
Innovation Solution
An optical imaging lens assembly comprising five lenses with specific refractive powers and surface configurations, including positive and negative refractive powers, convex and concave surfaces, and carefully controlled focal lengths and curvatures, is designed to optimize light transmission and reduce aberrations, achieving a total effective focal length to entrance pupil diameter ratio of ≤1.9, thereby enhancing image quality in low-light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the F-number is reduced to increase light transmission, then image quality in low-light conditions is improved, but the lens assembly size increases
Solution Approach 1:
The patent divides the lens assembly into five separate lens elements (first lens E1, second lens E2, third lens E3, fourth lens E4, and fifth lens E5) with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to light transmission and aberration correction, achieving a low F-number (≤1.9) while maintaining a compact overall structure suitable for portable devices.
Solution Approach 2:
The patent employs specific parameter relationships between lens elements, including focal length ratios (f/|f2|≤0.1, 1.3≤f/f4≤1.6, −1.8≤f/f5≤−1.5) and curvature ratios (|R2/R6|≤0.1), to optimize light transmission while controlling the physical dimensions. These parameter optimizations enable the lens assembly to achieve F-number ≤1.9 without excessive size increase.
2Measurement precision
If the pixel size is reduced to increase the number of pixels, then resolution is improved, but the amount of light passing through the lens assembly decreases
Solution Approach 1:
The five-lens segmented structure with alternating refractive powers enables precise control of light paths to different pixel regions. This segmentation allows effective light distribution across high-density pixel arrays, ensuring sufficient light transmission even when pixel sizes are reduced to increase resolution.
Solution Approach 2:
Different lens elements are designed with specific local optical properties (positive or negative refractive power) to address different aspects of light transmission. The third lens (negative power) and fifth lens (negative power) specifically help control light distribution to edge pixels, ensuring uniform illumination across the entire sensor array despite smaller pixel dimensions.
3Volume of moving object
If the lens assembly is miniaturized to fit portable devices, then portability is improved, but image quality under insufficient lighting deteriorates
Solution Approach 1:
The patent segments the optical system into five compact lens elements rather than using a single large lens. This segmentation enables the achievement of F-number ≤1.9 (high light transmission) within a miniaturized form factor, as each lens element contributes efficiently to the overall optical performance without requiring excessive space.
Solution Approach 2:
The patent optimizes critical parameter relationships (focal length ratios, curvature ratios, thickness-to-radius ratios) to maximize light transmission efficiency within constrained dimensions. These parameter optimizations enable the miniaturized lens assembly to achieve F-number ≤1.9, ensuring adequate light transmission despite the reduced overall size required for portable device integration.
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 lens assembly effectively increases light transmission, improves image quality, and reduces aberrations, achieving a large aperture advantage while maintaining miniaturization and low sensitivity, making it suitable for portable electronic devices.
Implementation Method 1
The first lens E1 has a positive refractive power, the second lens E2 has a negative refractive power, the third lens E3 has a negative refractive power, the fourth lens E4 has a positive refractive power, and the fifth lens E5 has a positive refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly. The optical imaging lens assembly includes, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has a positive refractive power, an object-side surface of the first lens is a convex surface, and an image-side surface of the first lens is a concave surface. The second lens has a positive refractive power or a negative refractive power. The third lens has a negative refractive power. The fourth lens has a positive refractive power. The fifth lens has a negative refractive power, and an image-side surface of the fifth lens is a convex surface. A total effective focal length f of the optical imaging lens assembly and an entrance pupil diameter EPD of the optical imaging lens assembly satisfy: f/EPD≤1.9.