Compact Imaging Lens System with High Refractive Index Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Compact cameras mounted on wireless terminals face challenges in achieving high performance due to size limitations, making it difficult to develop imaging lens systems that improve performance without increasing the camera's size.
Innovation Solution
An imaging lens system comprising a specific configuration of lenses with refractive indices and shapes, including a first lens with a concave image side surface, a third lens with a concave object side and convex image side surface, and a fifth lens with negative refractive power, optimized to satisfy conditions such as TTL/2IH < 0.613 and 25 < V1-V3 < 45, enhancing performance while maintaining compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses is increased to improve imaging performance, then the performance is improved, but the total length of the lens system increases
Solution Approach 1:
The patent applies parameter changes by selecting specific refractive indices for each lens element (first lens: 1.5-1.7, second lens: 1.6-1.8, third lens: 1.5-1.7, fourth lens: 1.6-1.8, fifth lens: 1.5-1.7) and optimizing their respective focal lengths and curvature radii to achieve high imaging performance with a compact total length. This systematic parameter optimization allows the lens system to maintain short overall dimensions while incorporating multiple lens elements for superior image quality.
2Length of moving object
If the refractive power of lenses is increased to reduce the focal length, then the lens system becomes more compact, but chromatic aberration increases
Solution Approach 1:
The patent employs composite materials principle by combining multiple lens elements with different refractive indices and dispersion characteristics. The lens system uses five distinct lens elements where each element is made of optical material with specifically controlled refractive index and Abbe number, creating a composite optical system that corrects chromatic aberration while maintaining short focal length. The variation in material properties across different lens elements enables effective chromatic aberration compensation.
Solution Approach 2:
The patent applies segmentation by dividing the optical system into five separate lens elements rather than using a single lens. This segmentation allows each element to contribute differently to the overall optical function, with specific elements designed to correct chromatic aberration while others focus on achieving the required focal length and field of view. The divided structure enables independent optimization of each element's parameters.
3Use of energy by moving object
If the aperture is increased to improve light gathering ability, then the light gathering ability is improved, but flare phenomena increase
Solution Approach 1:
The patent converts the potential harm of increased aperture (which causes flare) into benefit by using the larger aperture for improved light gathering, while the specifically designed lens element configurations and refractive index distributions work to suppress flare phenomena. The optical design transforms what would normally be a problematic configuration into an advantageous one by carefully balancing aperture size with lens element parameters.
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 lens system improves the performance of compact cameras by optimizing refractive powers and shapes, reducing chromatic aberrations and flare phenomena, and allowing for miniaturization, making it suitable for portable terminals.
Implementation Method 1
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, sequentially disposed at intervals from an object side of the imaging lens system. A refractive index of each of the second lens, the third lens, the fourth lens, and the fifth lens is 1.6 or greater
Data Source
AI summary
An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, sequentially disposed at intervals from an object side of the imaging lens system. A refractive index of each of the second lens, the third lens, the fourth lens, and the fifth lens is 1.6 or greater, and TTL/2IH<0.730, where TTL is a distance from an object side surface of the first lens to an imaging plane, and 21H is a diagonal length of the imaging plane.