Four-Lens Camera Module with Refractive Power Distribution for Ultra-Thin Wide Angle
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Solution Overview
Problem
Existing camera lenses with four-piece configurations face challenges in achieving ultra-thin and high-luminous flux wide angle performance due to insufficient refractive power distribution and improper lens shapes, leading to suboptimal optical properties such as high F-number and aberration issues.
Innovation Solution
A camera lens design comprising four lenses with specific refractive power distributions and spherical surface designs, including a glass plate or optical filter between the fourth lens and the imaging surface, adhering to specific focal length and curvature radius conditions to optimize optical performance, ensuring a TTL/LH ratio ≤1.47 and Fno ≤2.0.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a four-piece lens configuration is used, then the lens can achieve wide angle coverage, but the lens becomes too thick and cannot achieve ultra-thin profile
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive power distribution (f1/f, f2/f, f4/f ratios) and curvature radius relationships ((R1+R2)/(R1-R2), (R3+R4)/(R3-R4)) of each lens element. These parameter optimizations enable the four-piece lens to achieve ultra-thin profile (TTL/LH≤1.47) while maintaining wide angle coverage, resolving the contradiction between thickness and angular coverage.
2Length of stationary object
If the refractive power distribution is increased to reduce thickness, then the lens becomes ultra-thin, but optical aberrations increase and performance deteriorates
Solution Approach 1:
The patent applies local quality by assigning specific refractive power ranges and curvature characteristics to each individual lens element (first lens with positive power, second with negative, third with positive, fourth with negative). Each lens element is optimized with specific focal length ratios (f1/f, f2/f, f4/f) and shape factors ((R1+R2)/(R1-R2), (R3+R4)/(R3-R4))), enabling the system to achieve ultra-thin profile while correcting optical aberrations through the coordinated local properties of each element.
3Illumination intensity
If the F-number is reduced to increase luminous flux, then brightness improves, but lens complexity and manufacturing difficulty increase
Solution Approach 1:
The patent achieves Fno≤2.0 (high luminous flux) through parameter changes in the lens design, specifically by optimizing the refractive power distribution (f1/f, f2/f, f4/f ratios) and curvature radius relationships ((R1+R2)/(R1-R2), (R3+R4)/(R3-R4))). These parameter optimizations enable the lens to achieve low F-number with standard manufacturing processes, avoiding excessive complexity while maintaining high brightness 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 design achieves excellent optical properties, including an ultra-thin and wide angle with high luminous flux, correcting aberrations and maintaining a low F-number, thereby enhancing the camera lens's performance for mobile phone and webcam applications.
Implementation Method 1
a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with negative refractive power
Data Source
AI summary
A camera lens is disclosed. The camera lens includes four piece ultra-thin and wide angle lenses with excellent optical properties and with chromatic aberration sufficiently corrected as follows: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with negative refractive power; which are arranged sequentially from object side. The camera lens is characterized in that it meets specified conditions.