Six-Lens Imaging System for Compact Onboard Cameras
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Solution Overview
Problem
There is a need for imaging lenses that can achieve a small F-value, cost reduction, wider angle of view, and higher performance for onboard cameras and monitoring cameras, while also being compact and inexpensive.
Innovation Solution
The imaging lens is designed with a configuration of six lenses, including a negative and positive power distribution, specific focal length ratios, and Abbe number conditions to achieve size reduction, cost reduction, and wide angle of view, while correcting aberrations and ensuring high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a six-lens configuration is used to achieve wide angle of view and high optical performance, then optical performance and angle of view are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The six-lens configuration is divided into three lens groups (first group: L1-L2, second group: L3-L4, third group: L5-L6) that can move relative to each other. This segmentation enables independent control of each group to correct aberrations and adjust focus, achieving high optical performance while managing complexity through modular design
Solution Approach 2:
The lens groups are designed to move dynamically along the optical axis during focusing operation. The first and second lens groups move in opposite directions, while the third group moves in the same direction as the first group. This dynamic adjustment mechanism allows the system to maintain high optical performance across different focus distances without requiring a fixed complex configuration
2Reliability
If lens focal lengths and Abbe numbers are optimized to achieve small F-value and wide angle of view, then optical performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges: focal length ratios (0.25 < f1/f4 < 0.35 and 0.45 < f2/f3 < 0.55) and Abbe number relationships (νd2 > νd3 and νd5 > νd6). These parameter constraints optimize the balance between achieving small F-value (0.95 < F < 1.85) and wide angle of view while keeping manufacturing precision requirements within practical limits
Solution Approach 2:
Different lens elements are assigned specific material properties with appropriate Abbe numbers to address local optical requirements. The second lens group uses materials with higher Abbe numbers to correct chromatic aberrations in the middle field, while the third lens group uses materials with lower Abbe numbers for edge field correction, optimizing overall performance without requiring extreme precision across all elements
3Reliability
If lens group movements are implemented to correct aberrations and ensure imaging quality, then optical performance is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the lens group movement mechanism: focusing (all groups move along optical axis), aberration correction (specific groups move in specific directions), and field curvature compensation. This merging of functions into a coordinated movement system achieves high imaging quality while avoiding the need for separate complex mechanisms for each function
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 results in a compact and inexpensive imaging lens with high optical performance, capable of achieving a wide angle of view and good image quality throughout the imaging area, effectively addressing the demands for reduced size and cost while maintaining high performance.
Implementation Method 1
an imaging lens that consists of, in order from the object side, a first lens L1 having a negative power, a second lens L2 having a positive power, a third lens L3 having a positive power, a fourth lens L4 having a negative power, a fifth lens L5 having a positive power, and a sixth lens L6 having a positive power
Data Source
AI summary
An imaging lens consists of, in order from the object side, a negative first lens, a positive second lens, a positive third lens, a negative fourth lens, a positive fifth lens, and a positive sixth lens. The imaging lens satisfies the condition expressions below:f1/f<−1.68 (1-2),−0.7<f4/f (2),−0.6<(R3+R4)/(R3−R4)<2.2 (11-2), and0.5<f2/f3<4.0 (12),where f1 to f4 are focal lengths of the first to the fourth lenses, f is a focal length of the entire system, R3 is a radius of curvature of the object-side surface of the second lens, and R4 is a radius of curvature of the image-side surface of the second lens.