Six-Lens Camera Optical Lens Design for Miniaturization
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Solution Overview
Problem
There is a need for ultra-thin, wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration for handheld devices, as existing lenses struggle to achieve high imaging quality due to increasing pixel density and smaller sensor sizes in smartphones and digital cameras.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising lenses made of plastic materials with specific refractive powers and curvature radii, optimized to minimize total optical length and correct aberrations, ensuring better imaging quality and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens pieces is increased to improve imaging quality, then chromatic aberration correction improves, but device thickness and complexity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices and Abbe numbers of lens materials, along with optimizing curvature radii and thickness ratios. Specifically, it uses conditions like 1.40≤f1/f≤5.00 for focal length ratios and 0.005≤d2/d1≤0.300 for thickness ratios to achieve excellent chromatic aberration correction with only 6 lens pieces, avoiding the need for more complex 7-piece or 8-piece structures.
Solution Approach 2:
The patent employs composite material principles by combining plastic lens materials with different optical properties (refractive indices nd1-nd6 and Abbe numbers vd1-vd6) to correct chromatic aberrations. Each lens piece is made from materials selected to satisfy specific optical conditions, creating a composite optical system that achieves superior correction without increasing the number of pieces excessively.
2Volume of moving object
If the lens is miniaturized to reduce device size, then portability improves, but optical performance and aberration correction deteriorate
Solution Approach 1:
The patent uses parameter changes to maintain excellent optical performance in a miniaturized design by optimizing the ratios of focal lengths (f1/f, f2/f, f3/f, f4/f, f5/f) and thicknesses (d2/d1, d3/d2, d4/d3, d5/d4, d6/d5). These normalized parameters allow the lens to achieve superior chromatic aberration correction and imaging quality regardless of absolute size, enabling miniaturization without performance loss.
Solution Approach 2:
The patent applies curvature principles by optimizing the radius of curvature for each lens surface (R1-R12) relative to the focal length. The aspherical surface designs and carefully controlled curvature radii enable compact lens geometry while maintaining excellent optical performance and aberration correction, allowing miniaturization without sacrificing imaging quality.
3Measurement precision
If the aperture is increased to improve light gathering, then imaging quality improves, but chromatic aberration increases
Solution Approach 1:
The patent uses parameter changes to control chromatic aberration across different aperture conditions by optimizing the Abbe numbers (vd1-vd6) and refractive indices (nd1-nd6) of lens materials. The design satisfies conditions like 0.060≤(nd2-nd3)/(vd2-vd3)≤0.300 and 0.040≤(nd4-nd5)/(vd4-vd5)≤0.200, which ensure excellent chromatic aberration correction even with large aperture (FNO≤1.84), allowing improved light gathering without excessive chromatic aberration.
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 ultra-thin and wide-angle lenses with fully corrected chromatic aberrations, enhancing imaging performance and maintaining miniaturization characteristics, as demonstrated by Embodiments 1, 2, and 3, which provide excellent optical characteristics and a large aperture.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6... the second lens L2 has a negative refractive power... the third lens L3 has a positive refractive power
Data Source
AI summary
The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens; a fifth lens; and a sixth lens. The camera optical lens satisfies following conditions: −5.00≤f1/f2≤−1.70; and 2.00≤R3/R4≤20.00. The camera optical lens can achieve a high optical imaging performance while obtaining a low TTL.