Four-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
The challenge is to design an optical imaging lens that maintains good optical performance while being compact, as reducing the lens length complicates manufacturing and affects imaging quality, especially in low-light environments and near-infrared detection.
Innovation Solution
The optical imaging lens is designed with a configuration of four lens elements, each with specific surface shapes and refracting powers, including concave and convex portions, and satisfying the condition V4−V1≥30, which helps in overcoming aberrations and achieving good imaging quality under reduced system length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens system length is reduced to make the imaging module more compact, then the compactness is improved, but the imaging quality deteriorates
Solution Approach 1:
The lens system is divided into four distinct lens elements, each with specific refracting powers and surface shapes. This segmentation allows each element to contribute differently to the overall optical performance, enabling compact design while maintaining imaging quality through optimized individual element configurations.
Solution Approach 2:
Different lens elements are assigned different local optical properties: the first lens element has positive refracting power with specific surface curvatures, the second has negative refracting power with concave object-side surface, the third has positive refracting power, and the fourth has negative refracting power. This local differentiation of optical properties enables effective aberration correction in a compact form factor.
2Volume of moving object
If the lens system length is reduced, then the compactness is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element, including refracting powers (positive or negative), surface curvature radii, and thickness ratios. By optimizing these parameters within defined ranges, the design achieves compact dimensions while maintaining manufacturability through standardized optical design practices.
3Illumination intensity
If the aperture size is increased to improve low-light imaging performance, then the imaging quality in low-light conditions is improved, but the lens system length increases
Solution Approach 1:
The lens elements feature asymmetric surface designs with specific concave and convex portions at different locations (object-side surfaces versus image-side surfaces). This asymmetric configuration optimizes light gathering efficiency and aberration correction, enabling improved low-light performance without proportionally increasing the overall lens length.
4Adaptability or versatility
If the field of view is expanded to improve environmental monitoring capability, then the application versatility is improved, but the lens system length increases
Solution Approach 1:
The patent achieves expanded field of view not by simply extending the optical axis length, but by optimizing the lateral and angular characteristics through specific surface curvatures and refracting power distributions. This allows field of view expansion in dimensional directions other than simple axial extension, maintaining compact overall 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 design effectively reduces the lens system length while maintaining high imaging quality, expanding the field of view and improving performance in low-light conditions, making it suitable for various consumer electronic applications.
Implementation Method 1
The first lens element to the fourth lens element each include 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 includes a first lens element, a second lens element, a third lens element, and a fourth lens element from an object side to an image side in order along an optical axis. The first lens element to the fourth lens element each include 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. 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 second lens element has a convex portion in a vicinity of a periphery of the second lens element. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery of the third lens element. The fourth lens element has negative refracting power.