Six-Lens Camera System for Near-Infrared Driver Monitoring
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Solution Overview
Problem
Existing camera lenses for driver monitoring systems under near-infrared light have F-numbers (FNO) that are not bright enough, specifically within the range of 1.8 to 2.6, which limits their optical performance.
Innovation Solution
A camera lens system comprising six lenses with specific refractive power configurations and aspherical surfaces, adhering to certain curvature radius and focal length ratios, to achieve improved optical characteristics under near-infrared light while maintaining a bright F-number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a camera lens with four lenses is used to achieve good optical characteristics under near-infrared light, then the optical performance is improved, but the F-number remains too high (1.8 to 2.6) and not bright enough
Solution Approach 1:
The patent divides the optical system into six separate lens elements instead of four, with each lens having specific refractive power configurations. This segmentation allows for more precise control of light paths and better optimization of both near-infrared optical characteristics and F-number brightness, resolving the contradiction by enabling finer-tuned optical performance.
Solution Approach 2:
The patent implements specific parameter ranges for curvature radii (R1, R2, R3, R4, R5, R6) and focal lengths (f1, f2, f3, f4, f5, f6) of the six lens elements. By carefully controlling these parameters within defined ranges, the system achieves both good near-infrared optical characteristics and a brighter F-number, directly resolving the technical contradiction through quantitative parameter optimization.
2Reliability
If the number of lenses is increased from four to six to improve optical characteristics, then the optical performance under near-infrared light is enhanced, but the device complexity increases
Solution Approach 1:
The patent defines specific mathematical relationships and ranges for the parameters of the six lens elements, including curvature radii ratios (0.02 ≤ |R3/R4| ≤ 0.30) and focal length ratios (0.60 ≤ f3/f ≤ 1.20). These parameter constraints provide a systematic design framework that achieves superior near-infrared optical characteristics while managing the complexity of having six lens elements through standardized design rules.
3Reliability
If specific curvature radius and focal length ratios are imposed on the lenses, then the optical characteristics under near-infrared light are optimized, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes practical parameter ranges with reasonable tolerances, such as 0.02 ≤ |R3/R4| ≤ 0.30 and 0.60 ≤ f3/f ≤ 1.20, which balance optical performance optimization with manufacturability. These defined ranges provide clear manufacturing specifications that achieve excellent near-infrared optical characteristics while maintaining feasible production tolerances for mass manufacturing.
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 camera lens system achieves good optical characteristics under near-infrared light with a bright F-number, effectively addressing the limitations of previous designs by optimizing the refractive power and curvature ratios of its lenses.
Implementation Method 1
a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a positive refractive power
Data Source
AI summary
The present disclosure provides a camera lens including six lenses, having good optical characteristics under near-infrared light and having a bright F number. The camera lens includes, from an object side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; and a sixth lens having a positive refractive power. The camera lens satisfies prescribed conditions.