Eight-Lens Optical Imaging Assembly for Thin Mobile Phones
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Solution Overview
Problem
The challenge is to develop an optical imaging lens assembly for mobile phones that is miniaturized and thinned while maintaining high imaging quality, with improved performance to match advanced CCD and CMOS image sensors, requiring a large aperture and image plane.
Innovation Solution
The optical imaging lens assembly consists of eight lenses with specific refractive powers and surface types, optimized to achieve a large aperture and image plane, with refractive power distribution and surface configurations that balance aberrations and reduce processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized and thinned to meet mobile phone thickness requirements, then the device can be integrated into thinner mobile phones, but the imaging quality and aperture size are compromised
Solution Approach 1:
The lens assembly is divided into eight individual lenses with different refractive powers and surface types, allowing each lens to be optimized for specific optical functions while maintaining a compact overall structure. This segmentation enables complex optical corrections within a thin configuration.
Solution Approach 2:
The patent optimizes specific parameters including the focal lengths of individual lenses (f1, f2, f3, f4, f5, f6, f7, f8), air gaps between lenses, and surface curvatures (R1-R16) to achieve both thinness and high imaging quality. The total effective focal length f and entrance pupil diameter EPD are carefully controlled to satisfy f/EPD ≤ 2.8.
2Reliability
If the aperture and image plane are enlarged to cooperate with improved image sensors, then imaging quality is enhanced, but the lens assembly size and complexity increase
Solution Approach 1:
The optical system is segmented into eight lenses with specific refractive power distributions, where each lens contributes to correcting specific aberrations. This segmentation allows achieving large aperture (f/EPD ≤ 2.8) and large image plane (ImgH ≥ 6.0 mm) without proportionally increasing overall complexity.
Solution Approach 2:
Different regions of the lens assembly have specialized functions: the first lens (f1) provides positive refractive power for initial light convergence, while subsequent lenses with varying refractive powers (positive and negative) locally correct specific optical aberrations. The eighth lens specifically provides negative refractive power to control field curvature and distortion.
3Reliability
If multiple lenses with different refractive powers are used to correct aberrations, then imaging quality is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for lens focal lengths, air gaps, and surface curvatures that balance optical performance with manufacturability. For example, the total effective focal length f is controlled to satisfy 0.5 < f/TTL < 2.0, and individual lens focal lengths are optimized to reduce sensitivity to manufacturing tolerances while maintaining aberration correction.
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 solution enables a compact, high-performance optical imaging lens assembly with improved imaging quality, suitable for mobile devices, capable of handling low-light conditions and providing clear images in various environments.
Implementation Method 1
a first lens having refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; a seventh lens having positive refractive power; and an eighth lens having negative refractive power
Data Source
AI summary
Disclosed herein is an optical imaging lens assembly, sequentially includes, from an object side to an image side along an optical axis, a first lens having refractive power; a second lens having an refractive power, the image-side surface thereof is concave; a third lens having refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens having refractive power; a seventh lens having a positive refractive power, the object-side surface thereof is a convex surface; and an eighth lens having a negative refractive power, the object-side surface thereof is a concave surface; where half of a diagonal length ImgH of an effective pixel area on an image plane of the optical imaging lens assembly satisfies: ImgH≥6.0 mm, and the 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<1.8.