Four-Lens Camera Optics for Miniaturized Wide-Angle Imaging
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Solution Overview
Problem
The demand for miniaturized camera optical lenses with good imaging quality has increased due to the trend of lightweight, thin, and portable electronic devices, and the need for improved optical performance in multi-lens structures with reduced pixel areas.
Innovation Solution
A camera optical lens design comprising four lenses, each with specific refractive powers and geometric relationships, including glass materials, to optimize optical performance, minimize aberrations, and achieve wide-angle and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-lens structure is used to improve imaging quality, then optical performance is improved, but device complexity increases
Solution Approach 1:
The optical system is divided into four distinct lens elements with specific refractive powers (first lens: negative, second lens: positive, third lens: positive, fourth lens: negative). Each lens element is optimized independently with specific focal length ratios and curvature relationships, allowing complex optical performance to be achieved through modular segmentation rather than a monolithic complex structure.
Solution Approach 2:
Each lens element is assigned specific local optical properties: the first lens has negative refractive power with specific curvature ratios (R1+R2)/(R1-R2) between 1.77-10.09, the second lens has positive refractive power with curvature ratio R3/R4 between -6.00 to -1.00, the third lens has positive refractive power, and the fourth lens has negative refractive power with focal length ratio f4/d7 between -3.00 to -1.50. This localized optimization of optical properties at different positions in the system achieves overall high imaging quality while maintaining manageable structural complexity.
2Volume of moving object
If pixel area is reduced for miniaturization, then device size is reduced, but imaging quality deteriorates
Solution Approach 1:
The patent employs precise parameter control to maintain imaging quality in miniaturized form: the focal length ratios (f1/d1 between -30.00 to -8.00, TTL/f between 2.00 to 3.00, f34/f between -2.30 to -0.65) and curvature ratios are optimized within specific ranges. These parameter changes allow the lens system to achieve compact size while correcting optical aberrations effectively, thereby maintaining high imaging quality despite reduced dimensions.
3Area of moving object
If focal length is reduced for wide-angle, then field of view is expanded, but optical performance deteriorates
Solution Approach 1:
The patent uses asymmetric distribution of refractive powers among the four lens elements to achieve wide-angle performance while maintaining optical quality. The alternating pattern of negative-positive-positive-negative refractive powers creates an asymmetric optical path that effectively controls light rays across a wide field of view. This asymmetric design, combined with specific focal length and curvature ratios, enables the system to expand field of view without significant degradation of optical performance such as chromatic aberration and field curvature.
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 design achieves good optical performance, particularly suitable for mobile phone, vehicle-mounted, and WEB camera lenses, with effective correction of chromatic aberrations and field curvature, supporting high-definition imaging.
Implementation Method 1
a first lens having a negative refractive power
Implementation Method 2
a second lens having a positive refractive power
Implementation Method 3
a third lens having a positive refractive power
Implementation Method 4
a fourth lens having a negative refractive power
Data Source
AI summary
Provided is a camera optical lens, including first lens having negative refractive power, second lens having positive refractive power, third lens having positive refractive power, and fourth lens having negative refractive power, focal length of the camera optical lens is f, focal length of the first lens is f1, combined focal length of the third and fourth lenses is f34, on-axis thickness of the first lens is d1, on-axis distance between the first and second lenses is d2, total optical length of the camera optical lens is TTL, abbe number of the first lens is v1, following relational expressions are satisfied: −30.00≤f1/d1≤−8.00; 2.00≤TTL/f≤3.00; −2.30≤f34/f<−1.30; 58.00≤v1≤82.00; 0.25≤d2/TTL≤0.45. The camera optical lens has good optical performance, and is particularly suitable for mobile phone camera lens assembly, vehicle-mounted lens and WEB camera lens.