Two-Element Optical Lens Aberration Control
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving a balance between cost reduction, compactness, and maintaining good imaging quality, especially in applications such as portable electronic devices.
Innovation Solution
The optical imaging lens is designed with a configuration of two lens elements, where each lens element has specific surface shapes and orientations, including concave and convex regions, to optimize refracting power and minimize system length while ensuring good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of lens elements is reduced to two elements, then manufacturing cost is reduced and device complexity is lowered, but imaging quality and aberration control deteriorate
Solution Approach 1:
The patent applies local quality by designing specific surface shapes (concave/convex combinations) for different regions of the lens elements. The first lens element has a convex object-side surface and concave image-side surface, while the second lens element has convex surfaces on both sides. This localized surface geometry optimization enables effective aberration control with only two lens elements, resolving the contradiction between reduced element count and maintained imaging quality.
2Length of moving object
If the optical system is designed to be compact, then the TTL (total track length) is reduced, but aberration control and imaging quality worsen
Solution Approach 1:
The patent employs parameter changes by optimizing the Abbe number of the first lens element (V1 between 20-30) and controlling the thickness ratio (TTL/T2 between 2.5-8). These parameter specifications enable compact TTL while maintaining proper refractive power distribution and aberration control, achieving both compactness and imaging quality.
3Manufacturing precision
If the Abbe number of the first lens element is limited to V1≤30, then chromatic aberration is reduced, but material selection and manufacturing become more constrained
Solution Approach 1:
The patent specifies the Abbe number parameter V1 for the first lens element within the range of 20-30, which optimizes chromatic aberration control. This parameter constraint is combined with specific surface curvature designs to achieve good imaging quality while working within practical material selection boundaries, balancing optical performance and manufacturability.
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 design achieves a compact and cost-effective optical imaging lens with improved aberration control, reduced distortion, and enhanced manufacturing ease, thereby delivering good imaging quality in portable devices.
Implementation Method 1
Each of the first lens element and the second lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens, including a first lens element and a second lens element arranged in sequence from an object side to an image side along an optical axis. Each of the first lens element and the second lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. An optical axis region of the image-side surface of the second lens element is concave, and a periphery region of the image-side surface of the second lens element is convex.