Six-Element Imaging Lens Compact System Length
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Solution Overview
Problem
Conventional imaging lenses for portable electronic devices are too long and fail to meet the stringent design requirements for reduced dimensions while maintaining optical performance, particularly due to their undersized field of view and system length.
Innovation Solution
A compact imaging lens design comprising six lens elements with specific refractive powers and surface profiles, including convex and concave portions, arranged along the optical axis to optimize air gap lengths and thickness ratios, ensuring a shorter overall length without compromising optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional imaging lens with six lens elements is designed with both object-side and image-side surfaces having concave portions at the periphery of the third lens element, then the lens structure is established, but the field of view becomes substantially undersized and the system length becomes too long
Solution Approach 1:
The patent applies local quality by configuring different surface profiles (convex or concave portions) at specific locations of lens elements. Specifically, the first lens element has a convex portion at its object-side surface and concave portion at its image-side surface, while the third lens element has convex portions at both surfaces. This localized variation in surface geometry optimizes the balance between field of view and system length, resolving the contradiction by tailoring each lens element's local characteristics to contribute to overall system performance.
2Length of stationary object
If the system length of the imaging lens is reduced, then the dimension is minimized, but the optical performance may be compromised
Solution Approach 1:
The patent employs parameter changes by precisely controlling the air gap lengths between lens elements and the thickness of individual lens elements. The design specifies that the air gap between the first and second lens elements, and between the fourth and fifth lens elements, should be within 0.5mm to 2.0mm, while the air gap between the third and fourth lens elements should be within 0.3mm to 1.5mm. These parameter optimizations allow the system to achieve reduced length while maintaining optical performance through careful adjustment of spacing and dimensional parameters.
3Length of stationary object
If the air gap lengths between lens elements are reduced to shorten the system, then the overall length is minimized, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the imaging lens into six distinct lens elements with specific refractive powers and surface profiles. Each lens element is designed with predetermined air gaps, allowing the overall system length to be reduced through optimized segmentation of the optical path. The segmentation enables independent optimization of each air gap (first air gap: 0.5-2.0mm, second air gap: 0.3-1.5mm) while maintaining total system compactness, thereby managing manufacturing precision requirements through modular design.
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 design achieves a reduced system length while maintaining good optical performance, including low spherical and chromatic aberrations, and is easier to manufacture, supporting the miniaturization of electronic devices.
Implementation Method 1
Each of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element has a refractive power
Data Source
AI summary
An imaging lens includes first to sixth lens elements arranged from an object side to an image side in the given order. Through designs of surfaces of the lens elements and relevant lens parameters, a short system length of the imaging lens may be achieved while maintaining good optical performance.