Two-Piece Plastic Lens System for Mobile Camera Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional two-piece optical lens systems for mobile phone cameras face issues with incident angle characteristics, high cost of glass components, insufficient chromatic aberration correction, and manufacturing challenges due to weak refractive power and complex lens element shapes.
Innovation Solution
A two-piece optical lens system comprising a positive meniscus first lens element with a convex object-side surface and a negative meniscus second lens element with a convex image-side surface, both made of plastic material, optimized by specific focal length and Abbe number ratios to balance refractive power and correct aberrations, ensuring high optical performance and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a two-piece optical lens system is used to miniaturize the mobile phone camera, then the device size is reduced, but the incident angle characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratio (f1/f) between 0.55-0.95 and the Abbe number difference (ν1-ν2) between 27-65. These parameter optimizations enable the two-piece plastic lens system to achieve both miniaturization and acceptable incident angle characteristics for high-resolution image sensors.
Solution Approach 2:
The patent uses composite material principles by combining two different plastic materials with specific Abbe numbers (ν1 and ν2) to correct chromatic aberration while maintaining miniaturization. The differential refractive properties of the two materials enable both size reduction and performance optimization.
2Reliability
If glass material is used for the first lens element to ensure optical performance, then the optical quality is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces expensive glass material with plastic material for both lens elements. This substitution significantly reduces manufacturing cost while maintaining optical performance through optimized design parameters including aspheric surfaces and specific focal length ratios.
Solution Approach 2:
The patent changes the material parameter from glass to plastic and compensates for any optical performance loss through parameter optimization, including the focal length ratio (f1/f between 0.55-0.95) and aspheric surface coefficients, achieving cost reduction without sacrificing optical quality.
3Ease of manufacture
If the second lens element has weak refractive power to simplify manufacturing, then the ease of manufacture is improved, but the chromatic aberration correction becomes insufficient
Solution Approach 1:
The patent uses composite material principles by selecting two plastic materials with significantly different Abbe numbers (ν1-ν2 between 27-65). This material combination enables effective chromatic aberration correction through the differential dispersion properties, even with moderate refractive powers in each element.
Solution Approach 2:
The patent optimizes the focal length ratio (f1/f between 0.55-0.95) and the second element's focal length ratio (f2/f between -2.02/-1.0) to achieve balanced chromatic aberration correction. These parameter optimizations ensure sufficient correction performance while maintaining reasonable manufacturing complexity.
4Device complexity
If the first and second lens elements are made of the same material to reduce variety, then the manufacturing complexity is reduced, but the chromatic aberration correction becomes insufficient
Solution Approach 1:
The patent deliberately uses two different plastic materials with different Abbe numbers (ν1 and ν2, where ν1-ν2 is between 27-65) to correct chromatic aberration. The different dispersion properties of the two materials enable effective chromatic aberration correction, demonstrating that increased material diversity improves optical 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 system effectively corrects aberrations, provides high optical performance, and meets the requirements of miniaturization while reducing manufacturing complexities and costs, suitable for high-resolution image sensors like CCD or CMOS.
Implementation Method 1
Both the object-side surface and the image-side surface of the first and second lens elements are aspheric
Implementation Method 2
the first and second lens elements are made of plastic material, and they satisfy the relations: 0.55＜f1/f＜0.95 (1) −2.02＜f2/f＜−1.0 (2) 27＜ν1−ν2＜65 (3)
Data Source
AI summary
A two-piece optical lens system for taking image comprises, from the object side: a first lens element and a second lens element. The first lens element is a positive meniscus lens element has a convex object-side surface. The second lens element is a negative meniscus lens element has a convex image-side surface. Both the object-side surface and the image-side surface of the first and second lens elements are aspheric, the first and second lens elements are made of plastic material, and they satisfy the relations: 0.55<f1/f<0.95, −2.0<f2/f<−1.0, 27.0<ν1−ν2. The focal length of the optical lens system is f, the focal length of the first lens element is f1, the focal length of the second lens element is f2, the Abbe number of the first lens element is ν1, and the Abbe number of the second lens element is ν2.