Seven-Lens Camera Optics with Refractive Power Ratios
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Solution Overview
Problem
Current camera lenses with seven lenses fail to achieve a wide angle of 125° or larger, small size, and good optical characteristics due to insufficient refractive power and curvature radius ratios between the first and second lenses.
Innovation Solution
A camera lens configuration with seven lenses, where the refractive power and curvature radius ratios of specific lenses are optimized within defined relational formulas, ensuring a wide angle, small size, and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the refractive power of the first lens and second lens and the curvature radius ratio are not optimized, then the lens configuration is simple, but the wide angle and miniaturization are insufficient
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between lens parameters: the refractive power ratio f1/f is constrained to -2.00≤f1/f≤-1.67, the second lens refractive power ratio f2/f to 1.20≤f2/f≤1.60, and the curvature radius ratio |R3/R4| to 10.00≤|R3/R4|≤60.00. These parameter constraints enable miniaturization while maintaining wide-angle performance and optical quality.
2Adaptability or versatility
If the refractive power and curvature radius ratios are optimized for wide angle, then the wide angle increases to 2ω>125°, but the device complexity increases due to precise parameter control requirements
Solution Approach 1:
The patent defines specific parameter ranges to achieve wide-angle capability: the first lens focal length ratio f1/f between -2.00 and -1.67, the second lens focal length ratio f2/f between 1.20 and 1.60, and the curvature radius ratio |R3/R4| between 10.00 and 60.00. These parameter specifications enable 2ω>125° wide-angle performance while providing clear manufacturing guidelines.
Solution Approach 2:
The patent divides the lens system into seven distinct lens elements with specific refractive power assignments (negative, positive, positive, negative, positive, negative, negative from object side). This segmentation allows each lens to contribute specifically to achieving the wide-angle field of view while managing optical aberrations.
3Volume of moving object
If the lens configuration is designed for small size, then the compactness improves, but the optical characteristics deteriorate without proper parameter optimization
Solution Approach 1:
The patent establishes precise parameter relationships to maintain optical quality in a compact design: the focal length ratios f1/f=-2.00≤-1.67 and f2/f=1.20≤1.60, combined with the curvature radius ratio |R3/R4|=10.00≤60.00, ensure that miniaturization does not compromise optical performance. These parameter constraints guarantee reliable imaging characteristics.
Solution Approach 2:
The patent assigns different refractive power characteristics to different lens positions: the first lens has negative refractive power for wide-angle correction, the second lens has positive refractive power for focusing, and subsequent lenses have alternating powers for aberration control. This local differentiation of optical properties ensures high-quality imaging in a compact form.
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 optimized lens configuration achieves a wide angle of 2ω>125°, a small size, and excellent optical characteristics, effectively correcting various aberrations and enabling high-resolution imaging in portable and web cameras.
Implementation Method 1
a first lens having a negative refractive power; a second lens having a positive refractive power
Data Source
AI summary
The present invention provides a camera lens having good optical characteristics, a wide angle, and a small size, and constituted by seven lenses. The camera lens includes, from an object side: a first lens having a negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; a fourth lens having a negative refractive power; a fifth lens having positive refractive power; a sixth lens having a negative refractive power; and a seventh lens having a negative refractive power. The camera lens satisfies given relational formulas.