Six-Lens Optical Imaging System for Wide-Angle Low-Light Capture
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Solution Overview
Problem
Miniaturization of portable terminals poses challenges in implementing high-resolution and high-performance camera modules due to size constraints, requiring lighter lenses made of plastic instead of glass, while maintaining optical imaging quality.
Innovation Solution
An optical imaging system comprising six sequentially arranged lenses with specific refractive powers and aspherical surfaces, optimized with expressions for F-number, angle of view, and Abbe number to achieve high resolution and improved aberration correction, even in low illumination environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If lenses are made of plastic material to reduce weight, then weight is reduced and portability is improved, but manufacturing precision and optical quality are compromised
Solution Approach 1:
The patent applies parameter changes by carefully controlling the Abbe number (a parameter indicating dispersion characteristics) of the plastic lens materials. By selecting plastic materials with specific Abbe number ranges (second lens: 19.5-21.5, fourth lens: 22.0-24.0), the invention optimizes optical performance while maintaining the weight advantages of plastic materials over glass
Solution Approach 2:
The patent uses composite material principles by combining multiple plastic lens materials with different optical properties (different Abbe numbers and refractive indices) into a single optical system. This allows the system to achieve superior optical quality that would be difficult to obtain with a single material type, while still maintaining the overall weight benefits of using plastic instead of glass
2Measurement precision
If five or more lenses are arranged to achieve high resolution, then image quality is improved, but device complexity and size increase
Solution Approach 1:
The patent applies local quality by assigning specific optical characteristics to each lens position in the five-lens system. Each lens is optimized with particular Abbe number ranges and surface curvature characteristics suited to its specific location and function within the optical train, allowing the system to achieve high resolution without requiring additional lenses
Solution Approach 2:
The patent segments the optical correction function across five specifically designed lenses, where each lens contributes to correcting different types of optical aberrations. This segmentation of functional responsibilities allows the system to achieve high image quality with a compact five-lens configuration rather than requiring a larger number of lenses
3Illumination intensity
If F-number is reduced to less than 1.8 for better low-light performance, then brightness is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent applies parameter changes by optimizing multiple lens parameters simultaneously - specifically the Abbe numbers, focal lengths, and surface curvatures of all five lenses - to achieve aberration correction performance that enables F-numbers less than 1.8. The conditional expressions in the patent define specific parameter ranges that must be satisfied to achieve both low F-number and good aberration correction
Solution Approach 2:
The patent uses composite material principles by combining plastic lens materials with different Abbe numbers in a multi-lens configuration. This diversity in material properties across the lens system provides additional degrees of freedom for correcting aberrations while maintaining the low F-number required for bright low-light 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 provides a wide angle of view of 82 degrees or more and maintains image clarity with an F-number of 1.8 or less, enabling effective image capture in low light conditions and enhanced zoom magnification.
Implementation Method 1
a first lens having a positive refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis
Implementation Method 2
a second lens having a negative refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis
Implementation Method 3
a third lens having a positive refractive power, a convex object-side surface along an optical axis, and a concave image-side surface along the optical axis
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from an object side to an imaging plane. An angle of view of the optical system is 82 degrees or more. A constant indicating brightness of the optical system, F-number, is less than 1.8.