Four-Element Optical Imaging Lens for Compact FOV
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Solution Overview
Problem
The challenge is to design an optical imaging lens with a larger field of view and stable optical properties while minimizing its length, which is essential for compact portable electronic devices without compromising image quality.
Innovation Solution
The optical imaging lens is composed of four lens elements arranged sequentially, with specific surface structures and refracting powers, including a first lens element with negative power, a second lens element with a concave object-side surface, and a fourth lens element with a convex image-side surface, along with an aperture stop between the second and third lens elements, satisfying the condition ALT/(G12+G34)≤2.4 to achieve a shorter system length and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of optical imaging lens is shortened, then the image module becomes more compact, but the optical performance and image quality deteriorate
Solution Approach 1:
The optical imaging lens is divided into four separate lens elements (first lens element, second lens element, third lens element, and fourth lens element) arranged in sequence along the optical axis. This segmentation allows each lens element to be optimized independently for specific optical functions, enabling compact overall length while maintaining good optical performance through coordinated design of individual elements.
Solution Approach 2:
Different lens elements are assigned different refracting powers and surface characteristics tailored to their specific positions and functions. The first lens element has negative refracting power, while the second and fourth lens elements have positive refracting power with specific concave and convex surface portions. This local optimization of optical properties allows the compact system to achieve balanced optical performance across the entire field of view.
2Area of moving object
If the field of view is enlarged, then the imaging coverage increases, but the system aberrations and distortion increase
Solution Approach 1:
The second lens element features a concave portion on its object-side surface and the fourth lens element features a convex portion on its image-side surface. These localized surface curvature variations are specifically designed to counteract optical aberrations in different regions of the field of view, enabling enlarged imaging coverage while maintaining image quality through region-specific aberration correction.
Solution Approach 2:
The lens elements are designed with asymmetric surface configurations, where the second lens element has a concave object-side surface and the fourth lens element has a convex image-side surface. This asymmetric design allows for optimized light ray paths across the entire field of view, reducing distortion and aberration while achieving a larger field of view compared to symmetric designs.
3Length of moving object
If the length of optical imaging lens is shortened, then the device becomes more compact, but the image volume and image quality are reduced
Solution Approach 1:
By segmenting the optical system into four distinct lens elements with specific refracting powers, the design achieves compact length while maintaining sufficient image volume. Each lens element contributes to the overall optical path length and image formation process, allowing the system to pack more optical functionality into a shorter overall length.
Solution Approach 2:
The lens elements are designed with specific refracting power parameters and surface curvature parameters optimized for compact dimensions. The first lens element has negative refracting power while the second and fourth lens elements have positive refracting power, with carefully controlled thicknesses and air gaps. These parameter optimizations enable the system to achieve good image quality and adequate image volume within a shortened length.
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 enhances the field of view, reduces system aberrations, and maintains good image quality, achieving a slim design with a broader view angle while ensuring the lens system's optical properties remain stable and effective.
Implementation Method 1
The first lens element has negative refracting power
Implementation Method 2
The object-side surface of the second lens element has a concave portion in a vicinity of the optical axis
Implementation Method 3
The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery of the fourth lens element
Data Source
AI summary
An optical imaging lens includes a first lens element, a second lens element, an aperture stop, a third lens element, and a fourth lens elements arranged in sequence from an object side to an image side along an optical axis, and each lens element has an object-side surface and an image-side surface. The first lens element has negative refracting power. The object-side surface of the second lens element has a concave portion in a vicinity of the optical axis. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery of the fourth lens element.