Six-Lens Group Aberration Correction via Thickness Ratios
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Solution Overview
Problem
Existing photographing lenses, especially those with four or five lenses, struggle to meet high-performance requirements for resolution and optical properties, particularly in compact portable devices like mobile phones, where they often fail to provide satisfactory aberration correction and optical performance.
Innovation Solution
A compact high-performance photographing lens group is designed with a specific arrangement of six lenses, each with varying refractive powers and shapes, including a first biconvex lens, a second meniscus or biconcave lens, a third lens with positive or negative power, a fourth lens with positive or negative power, a fifth meniscus lens, and a sixth lens with a positive power, optimized to satisfy specific inequalities for refractive power distribution, thickness ratios, and Abbe number differences to correct aberrations and maintain a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a photographing lens with four or five lenses is used, then the device complexity is reduced, but the optical performance and aberration correction are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, thicknesses, and Abbe numbers of each lens element. Specific inequalities are defined for parameters such as the ratio of fifth to sixth lens thickness (0.15 < CT5/CT6 < 0.35), the focal length relationships (0.25 < |f1/f3| + |f1/f4| < 0.75), and Abbe number differences (5 < |Vd4 - Vd5| < 40). These parameter optimizations enable a 6-lens design to achieve superior optical performance while maintaining compact dimensions suitable for mobile devices.
2Reliability
If the number of lenses is increased to improve optical performance, then the aberration correction is enhanced, but the device size increases
Solution Approach 1:
The patent applies local quality by assigning specific functional characteristics to different lens elements within the 6-lens group. Each lens has optimized properties: the first lens has positive refractive power with a convex object-side surface, the second lens has negative refractive power, the fifth lens has negative refractive power with a meniscus shape and convex image-side surface, and the sixth lens has positive refractive power with inflection points on its surfaces. This localized optimization of each element's properties enables effective aberration correction while maintaining a compact overall length.
Solution Approach 2:
The patent utilizes aspheric surfaces on multiple lenses to correct aberrations more effectively than spherical surfaces. The sixth lens specifically includes at least one inflection point on its image-side or object-side surface, and the object-side surface is convex near the optical axis while the image-side surface is concave near the optical axis. These curvature variations enable compact lens design with improved optical performance.
3Length of moving object
If the lens thickness is reduced to make the device more compact, then the portability is improved, but the manufacturing precision and optical quality deteriorate
Solution Approach 1:
The patent defines specific parameter ranges that balance compactness with manufacturing precision. The thickness ratio inequality (0.15 < CT5/CT6 < 0.35) ensures that the fifth and sixth lenses maintain appropriate thickness relationships for manufacturability while keeping the overall lens group compact. The Abbe number difference constraint (5 < |Vd4 - Vd5| < 40) and focal length relationships ensure that optical quality is maintained even with reduced dimensions suitable for mobile devices.
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 group effectively corrects spherical, astigmatism, and chromatic aberrations, ensuring high-definition images while maintaining a compact form factor suitable for portable devices, enhancing the performance of electronic apparatuses like digital cameras and mobile phone cameras.
Implementation Method 1
a first lens G1 having a positive refractive power, a second lens G2 having a negative refractive power, a third lens G3 having a positive or negative refractive power, a fourth lens G4 having a positive or negative refractive power, a fifth lens G5 having a negative refractive power, and a sixth lens G6 having a positive refractive power
Implementation Method 2
The first, second, third, fourth, fifth, and sixth lenses may each have at least one aspheric surface
Implementation Method 3
The photographing lens group may satisfy an inequality of 5<|Vd4−Vd5|<40, where Vd4 is an Abbe number of the fourth lens, and Vd5 is an Abbe number of the fifth lens
Data Source
AI summary
A photographing lens group and an electronic apparatus including the same are provided. The photographing lens group includes a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive or negative refractive power, a fourth lens having a positive or negative refractive power, a fifth lens having a negative refractive power, and a sixth lens having a positive refractive power. The first, second, third, fourth, fifth, and sixth lenses are sequentially arranged from an object side to an image side of the photographing lens group. The photographing lens group satisfies an inequality of 1.0<CT6/CT5<3.5 where CT5 is a thickness of the fifth lens with respect to an optical axis and CT6 is a thickness of the sixth lens with respect to the optical axis.