Camera Lens Refractive Power Distribution for Wide-Angle Performance
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Solution Overview
Problem
Existing camera lenses with 4 small high-luminous flux wide-angle lenses suffer from inadequate refractive power distribution and shape, leading to insufficient Fno and wide-angle performance, as seen in previous embodiments and patent references.
Innovation Solution
A camera lens design comprising 4 lenses with specific refractive power conditions and non-spherical surfaces, where the first lens has positive refractive power, the second lens has negative refractive power, and the third and fourth lenses also have positive and negative refractive powers respectively, with glass plates between the fourth lens and the imaging plane to correct aberrations and enhance optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the camera lens uses 4 small lenses with conventional refractive power distribution, then the device complexity is reduced, but the Fno and wide-angle performance are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive power distribution among the 4 lenses using specific mathematical relationships (e.g., f1/f = 0.8 to 1.2, f2/f = -1.5 to -2.5). This optimization of optical parameters enables the compact 4-lens structure to achieve Fno≤2.2 and 2ω≥80°, resolving the contradiction between device simplicity and optical performance.
2Manufacturing precision
If the camera lens uses conventional lens shapes, then the manufacturing precision is easier to achieve, but the wide-angle performance and Fno are insufficient
Solution Approach 1:
The patent employs non-spherical surface designs for the lenses, specifically using aspherical surfaces with defined curvature radii and conic constants. This curvature optimization allows the compact 4-lens structure to achieve wide-angle performance (2ω≥80°) and low Fno (≤2.2) while maintaining manufacturability through standardized aspherical surface equations.
3Reliability
If the camera lens increases the number of lenses to improve optical properties, then the optical performance improves, but the device complexity and size increase
Solution Approach 1:
The patent achieves high optical performance with only 4 lenses by optimizing key parameters: refractive power distribution (f1/f = 0.8 to 1.2, f2/f = -1.5 to -2.5), surface curvatures (R1 to R8), and spacing (d1 to d4). This parameter optimization allows the system to correct aberrations and achieve Fno≤2.2 and 2ω≥80° without increasing lens count, thus maintaining device simplicity.
Solution Approach 2:
The patent segments the optical system into 4 functional lens groups with alternating positive and negative refractive powers, where each lens has a specific role in correcting particular aberrations. This functional segmentation enables efficient use of each lens element, achieving high optical performance with minimal lens count.
4Device complexity
If the camera lens uses inadequate refractive power distribution, then the device complexity is reduced, but the Fno and image quality are insufficient
Solution Approach 1:
The patent optimizes refractive power distribution through specific mathematical relationships: f1/f = 0.8 to 1.2, f2/f = -1.5 to -2.5, f3/f = 0.6 to 1.0, f4/f = -1.2 to -2.0. These parameter optimizations enable the 4-lens system to achieve excellent image quality with corrected aberrations while maintaining simple device structure.
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 high-luminous flux with excellent optical properties, supporting wide-angle views of 2ω≧80° and Fno≦2.2, while maintaining miniaturization and ultra-thin characteristics.
Implementation Method 1
a first lens with positive refractive power
Implementation Method 2
a second lens with negative refractive power
Implementation Method 3
a third lens with positive refractive power
Implementation Method 4
a fourth lens with negative refractive power
Data Source
AI summary
A camera lens includes, lined up from the object side to the image side, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power. The camera lens satisfies specific conditions.