Six-Lens Optical Camera Lens Design for Short TTL and Large Aperture
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Solution Overview
Problem
Conventional six-lens camera lens structures fail to meet the design requirements for low total track length (TTL) and large aperture, leading to inadequate imaging quality in miniaturized camera systems for portable devices.
Innovation Solution
A six-lens optical camera lens design with specific refractive power configurations and material choices, including aspheric surfaces, to control total track length and correct aberrations, while maintaining miniaturization and improving sensitivity performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional three-lens or four-lens structure is used, then the device complexity is reduced, but the imaging quality deteriorates when pixel area is reduced and system requirements increase
Solution Approach 1:
The patent applies multi-functionality by designing each lens element to serve multiple purposes: the first lens provides both positive refraction power and aspheric surface correction, the second lens combines negative refraction with specific curvature design for aberration control, and subsequent lenses similarly integrate multiple functions including field curvature correction, distortion control, and chromatic aberration management within a unified six-lens structure
Solution Approach 2:
The patent employs parameter changes by systematically adjusting refractive indices (nd1=1.544, nd2=1.651, nd3=1.544, nd4=1.651, nd5=1.544, nd6=1.535), Abbe numbers (v1=56.12, v2=21.51, v3=56.12, v4=21.51, v5=56.12, v6=56.12), focal lengths (f1=3.013mm, f2=-7.642mm, f3=8.048mm, f4=-9.763mm, f5=3.787mm, f6=-2.407mm), and surface curvatures (R1 through R12) to optimize the six-lens configuration for reduced TTL while maintaining large aperture and superior imaging quality
2Reliability
If a six-lens structure is adopted to improve imaging quality, then the imaging quality improves, but the total track length increases and aperture requirements cannot be met
Solution Approach 1:
The patent applies curvature principles by incorporating aspheric surfaces on multiple lens elements (object-side surface of first lens, image-side surface of second lens, image-side surface of third lens, object-side and image-side surfaces of fourth lens, object-side and image-side surfaces of fifth lens, and object-side surface of sixth lens) to reduce spherical aberration and enable compact folding of the optical path, achieving TTL≤4.3mm with large aperture
Solution Approach 2:
The patent employs parameter changes by systematically adjusting refractive indices (nd1=1.544, nd2=1.651, nd3=1.544, nd4=1.651, nd5=1.544, nd6=1.535), Abbe numbers (v1=56.12, v2=21.51, v3=56.12, v4=21.51, v5=56.12, v6=56.12), focal lengths (f1=3.013mm, f2=-7.642mm, f3=8.048mm, f4=-9.763mm, f5=3.787mm, f6=-2.407mm), and surface curvatures (R1 through R12) to optimize the six-lens configuration for reduced TTL while maintaining large aperture and superior imaging quality
3Reliability
If a six-lens structure is adopted to improve imaging quality, then the imaging quality improves, but the device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing each lens element to serve multiple purposes: the first lens provides both positive refraction power and aspheric surface correction, the second lens combines negative refraction with specific curvature design for aberration control, and subsequent lenses similarly integrate multiple functions including field curvature correction, distortion control, and chromatic aberration management within a unified six-lens structure
Solution Approach 2:
The patent employs parameter changes by systematically adjusting refractive indices (nd1=1.544, nd2=1.651, nd3=1.544, nd4=1.651, nd5=1.544, nd6=1.535), Abbe numbers (v1=56.12, v2=21.51, v3=56.12, v4=21.51, v5=56.12, v6=56.12), focal lengths (f1=3.013mm, f2=-7.642mm, f3=8.048mm, f4=-9.763mm, f5=3.787mm, f6=-2.407mm), and surface curvatures (R1 through R12) to optimize the six-lens configuration for reduced TTL while maintaining large aperture and superior imaging quality
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 a short total track length and large aperture, enhancing imaging quality and sensitivity, particularly in low irradiance environments, while allowing for cost-effective production using plastic lenses.
Implementation Method 1
The first lens L1 has positive refraction power, the second lens L2 has negative refraction power, the third lens L3 has positive refraction power, the fourth lens L4 has negative refraction power, the fifth lens L5 has positive refraction power, and the sixth lens L6 has negative refraction power
Data Source
AI summary
The present disclosure relates to the field of optical lens, and discloses an optical camera lens, which, from an object side to an image side, successively includes: an aperture, a first lens having positive refraction power, a second lens having negative refraction power, a third lens having positive refraction power, a fourth lens having negative refraction power, a fifth lens having positive refraction power, and a sixth lens having negative refraction power, which satisfy following relational expressions: 0.7<f1/f<0.8; −2<f2/f<−1.8; 1.9<f3/f<2.1; −2.6<f4/f<−2.2; 0.8<f5/f<1; −0.7<f6/f<−0.5; 1.9<f3/f5<2.2. The optical camera lens provided by the present disclosure can meet the design requirements on large aperture meanwhile shortening the total track length of the optical camera lens, thus achieving good sensitivity performance.