Five-Lens Camera Lens Ultra-Thin Bright F-Number Design
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Solution Overview
Problem
Existing camera lenses with five lenses struggle to achieve both ultra-thinness and a bright F-number due to insufficient refractive power distribution and focal length ratios, leading to suboptimal optical performance.
Innovation Solution
A five-lens camera lens system with specific refractive power distributions and focal length ratios, including a glass plate between the fifth lens and the imaging plane, optimized with aspheric surfaces to correct aberrations and achieve a bright F-number of less than 2.05, with relational expressions defining the lens parameters for ultra-thinness and optical quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the camera lens uses five ultrathin lenses with conventional refractive power distribution, then the total track length is reduced, but the F-number becomes insufficient (bright enough)
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive power distribution of each lens element and the ratios of focal lengths between lenses. Specifically, it sets the refractive power of the third lens to -5.00<f3/f<-3.50, the fourth lens to 0.50<f4/f<0.90, and the fifth lens to -0.80<f5/f<-0.60, along with focal length ratios f2/f1 between -2.90 and -3.50. These parameter optimizations enable the ultrathin lens structure to achieve both compact size and bright F-number performance
Solution Approach 2:
The patent applies local quality by giving each lens element specific refractive power characteristics tailored to its position in the optical system. The first lens has positive refractive power, while the second, third, and fifth lenses have negative refractive power, and the fourth lens has positive refractive power. This localized optimization of refractive power distribution across different positions in the lens system enables simultaneous achievement of ultrathin profile and bright F-number
2Length of moving object
If the camera lens uses five ultrathin lenses with conventional focal length ratios, then the device becomes compact, but the optical performance deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between focal lengths to optimize optical performance. It defines the refractive power of the third lens as -5.00<f3/f<-3.50, the fourth lens as 0.50<f4/f<0.90, and the fifth lens as -0.80<f5/f<-0.60. Additionally, it constrains the focal length ratio f2/f1 between -2.90 and -3.50. These parameter specifications ensure that the ultrathin lens design maintains excellent optical performance including corrected aberrations and high image quality
3Ease of manufacture
If the camera lens uses conventional refractive power distribution, then the manufacturing is simpler, but the F-number brightness is insufficient
Solution Approach 1:
The patent applies parameter changes by defining specific refractive power ranges for each lens element that balance manufacturability with optical performance. The third lens refractive power is set to -5.00<f3/f<-3.50, the fourth lens to 0.50<f4/f<0.90, and the fifth lens to -0.80<f5/f<-0.60. These parameter specifications provide clear manufacturing targets while achieving the desired bright F-number performance
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 camera lens that is ultra-thin with a bright F-number of 2.05, providing good optical properties, corrected aberrations, and improved image quality.
Implementation Method 1
optimized with aspheric surfaces to correct aberrations
Implementation Method 2
a five-lens camera lens system with specific refractive power distributions
Data Source
AI summary
The present disclosure provides a camera lens which has good optical properties, is ultra-thin, and includes five lenses having a bright F-number of less than 2.05. The camera lens includes, from an object side to an image side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power and a fifth lens having a negative refractive power. The camera lens satisfies specified relational expressions.