Six-Element Lens Assembly for Compact Mobile Terminals
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Solution Overview
Problem
Conventional compact optical systems for mobile terminals, such as smartphones and tablets, fail to meet the requirements for high resolution and image quality due to their lens structure, which is not favorable for reducing the back focal length and maintaining a compact size.
Innovation Solution
A photographing lens assembly comprising six non-cemented lens elements with specific refractive powers and surface shapes, including a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with refractive power, optimized to reduce the back focal length and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional four-element or five-element lens structures are used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The optical system is divided into six independent lens elements rather than using cemented groups, allowing each element to be optimized independently for aberration correction while maintaining manufacturing feasibility. This segmentation enables better control over each surface's refractive power and shape.
Solution Approach 2:
Each lens element is designed with specific local characteristics: the first element has positive power with convex surfaces for light gathering, the second has negative power with concave surfaces for aberration correction, and subsequent elements have optimized curvature radii and refractive powers tailored to their positions in the optical path.
2Manufacturing precision
If six-element lens structure is used to enhance image quality, then the resolution is improved, but the back focal length cannot be reduced and compact size is compromised
Solution Approach 1:
The patent optimizes specific parameters including the curvature radii of each lens element surface, the refractive power distribution across elements, and the spacing between elements. The sixth element's image-side surface is designed with a convex shape in off-axis regions, and specific ratios like f1/f and (R3+R4)/(R3-R4) are controlled to achieve compact back focal length while maintaining image quality.
3Manufacturing precision
If conventional lens surface shapes are used, then the manufacturing is simplified, but the aberration correction is insufficient for high resolution requirements
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements, particularly the sixth element which has a convex shape in off-axis regions. This curvature variation allows precise control over light ray paths to correct spherical aberration and other optical defects while maintaining manufacturability through modern molding techniques.
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 solution effectively corrects aberrations, reduces the back focal length, and maintains a compact size, enhancing image quality and resolution in mobile terminals.
Implementation Method 1
a first lens element 110 with positive refractive power, a second lens element 120 with negative refractive power, a third lens element 130 with refractive power, a fourth lens element 140 with positive refractive power, a fifth lens element 150 with negative refractive power, and a sixth lens element 160 with refractive power
Data Source
AI summary
A photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element, which has a total of six non-cemented lens elements with refractive power. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element with refractive power has an object-side surface being concave in a paraxial region thereof. The third and the fourth lens elements have refractive power. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region thereof.