Six-Lens Imaging Assembly with Aspheric Curvature for Compact Wide-Angle Design
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Solution Overview
Problem
Existing imaging lens assemblies for mobile phones and web cameras are too thick to meet miniaturization requirements due to a high total track length to image height ratio, compromising wide-angle and high-luminous flux performance.
Innovation Solution
A six-lens assembly with specific refractive power and curvature radius conditions for each lens, including aspheric surfaces on the sixth lens, is designed to optimize focal lengths and curvature ratios, ensuring a total track length to image height ratio of less than 1.38, a view angle of at least 78 degrees, and an F-number of 2.2 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional six-lens imaging assembly is used, then good optical characteristics are achieved, but the total track length to image height ratio exceeds 1.464 making the assembly too thick
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length ratios (f1/f, f2/f, f3/f, f4/f, f5/f) and curvature radius ratios (R1, R2, R3, R4, R5, R6) of each lens element. These parameter optimizations enable the imaging lens assembly to achieve TTL/IH < 1.38 while maintaining good optical characteristics, resolving the contradiction between thickness and optical performance.
2Length of moving object
If the total track length is reduced for miniaturization, then the lens assembly becomes thinner, but achieving wide-angle (≥78°) and high luminous flux (F-number ≤2.2) becomes difficult
Solution Approach 1:
The patent employs aspheric surfaces on the sixth lens (L6) with specific curvature radius constraints (|R6|/f ≥ 0.5) to optimize light ray control. This curvature optimization enables the compact lens assembly to achieve wide-angle coverage (≥78°) and high luminous flux (F-number ≤2.2) despite the reduced total track length, resolving the contradiction between miniaturization and optical performance.
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 achieves a compact, high-performance imaging lens assembly with good optical characteristics, supporting wide-angle and high-luminous flux capabilities while maintaining an ultra-thin profile, suitable for digital cameras and web cameras with CCD or CMOS imaging components.
Implementation Method 1
a sixth lens L6 having a negative refractive power, and satisfying the following condition (2): −4.00≤(R7+R8)/(R7−R8)≤−2.40 Where: R7 is a curvature radius of an object side of the forth lens L4; and R8 is a curvature radius of an image side of the forth lens L4
Data Source
AI summary
An imaging lens assembly is provided in the present disclosure. The imaging lens assembly includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a forth lens with positive refractive power, a fifth lens with positive refractive power and a sixth lens with negative refractive power. The first lens, the second lens, the third lens, the forth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side and satisfy conditions provided in the present disclosure.