Five-Lens Imaging System for Compact High-Resolution Optics
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Solution Overview
Problem
Existing imaging lenses for compact devices like cellular phones and smartphones face challenges in achieving high resolution while minimizing the total lens length, which affects imaging performance from central to peripheral angles of view.
Innovation Solution
The proposed imaging lens configuration consists of five lenses with specific refractive powers and shapes, including a first lens with positive refractive power and a meniscus shape convex toward the object side, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power and aspheric surfaces, optimized by conditional expressions to balance refractive powers and reduce total length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the imaging lens is composed of five or six lenses to enhance resolution performance, then the imaging performance is improved, but the total length of the lens increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers and shapes of each lens element. Specifically, the first lens has a meniscus shape convex toward the object side, the fifth lens has aspheric surfaces, and the refractive powers are optimized according to conditional expressions (0.04345<f/f45<0.05345 and -0.75<f/f2<0.85), achieving high resolution with reduced total lens length
Solution Approach 2:
The patent utilizes curved and aspheric surfaces to reduce optical path length and improve imaging performance. The first lens has a meniscus shape and the fifth lens has aspheric surfaces, which enable better light control and shorter total lens length while maintaining high resolution across the field of view
2Length of moving object
If the total length of the imaging lens is decreased for compact devices, then the device miniaturization is achieved, but the imaging performance from central to peripheral angles of view deteriorates
Solution Approach 1:
The patent applies local quality by optimizing each lens element's specific properties to address different parts of the field of view. The first lens with meniscus shape controls central aberrations, while the fifth lens with aspheric surfaces addresses peripheral aberrations, ensuring uniform imaging performance across the entire field despite reduced total length
Solution Approach 2:
The patent uses composite optical design combining multiple lens types with different refractive powers and shapes. The five-lens configuration includes positive and negative refractive power elements with specific shapes (meniscus and aspheric), creating a composite optical system that achieves both compactness and high resolution 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
This configuration achieves high resolution performance across the entire field of view while significantly reducing the total lens length, enhancing imaging quality and reducing aberrations.
Implementation Method 1
a first lens that has a positive refractive power and has a meniscus shape which is convex toward the object side
Implementation Method 2
a second lens that has a negative refractive power; a third lens that has a negative refractive power
Implementation Method 3
a fourth lens that has a positive refractive power
Implementation Method 4
a fifth lens that has a negative refractive power and has an object side surface and an image side surface which have aspheric shapes
Data Source
AI summary
An imaging lens substantially consists of, in order from an object side, five lenses of a first lens that has a positive refractive power and has a meniscus shape which is convex toward the object side, a second lens that has a negative refractive power, a third lens that has a negative refractive power, a fourth lens that has a positive refractive power, and a fifth lens that has a negative refractive power and has an object side surface and an image side surface which have aspheric shapes. Further, the imaging lens satisfies predetermined conditional expressions.