Optical Imaging Lens Miniaturization via Seven-Element Segmentation
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Solution Overview
Problem
Current optical imaging lenses used in mobile devices face challenges in achieving a F-number (Fno) of 1.4 or less and a field of view (FOV) of 38 degrees or more while maintaining image quality and minimizing thickness.
Innovation Solution
The design involves an optical imaging lens with at least seven lens elements, where the convex and/or concave surfaces of these elements are optimized to increase imaging quality and yield. Specific parameters such as thickness, distance between elements, refracting index, and Abbe number are carefully chosen to achieve the desired optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the optical imaging lens is reduced to achieve miniaturization, then the device size is decreased, but the imaging quality deteriorates
Solution Approach 1:
The optical imaging lens is divided into multiple lens elements (at least seven) with different optical powers and functions. Each lens element contributes to the overall imaging performance, allowing the system to maintain high imaging quality while reducing total thickness through optimized distribution of optical functions across segments.
Solution Approach 2:
Different lens elements are designed with specific local optical characteristics (positive or negative optical power, different refractive indices, different Abbe numbers) to address specific optical aberrations and performance requirements at different positions in the optical path, enabling miniaturization without sacrificing imaging quality.
2Illumination intensity
If the F-number is decreased to increase aperture size, then light gathering ability is improved, but the lens complexity increases
Solution Approach 1:
The patent specifies particular parameter ranges for lens elements including refractive index (1.5 < n < 2.0), Abbe number (20 < V < 60), and thickness ratios to achieve the target F-number of 1.4 or less while controlling complexity through systematic parameter optimization.
Solution Approach 2:
Different lens elements are made from materials with different refractive indices and Abbe numbers to optimize light transmission and reduce aberrations, enabling the system to achieve large aperture with Fno ≤ 1.4 while managing the complexity through material selection.
3Area of stationary object
If the field of view is increased to capture more scene, then the imaging coverage is expanded, but the distortion and aberration increase
Solution Approach 1:
The optical system is segmented into multiple lens elements with different optical powers arranged in specific sequences. This segmentation allows the system to achieve a wide field of view (38 degrees or more) while each element contributes to correcting aberrations and maintaining image quality across the expanded field.
Solution Approach 2:
Lens surfaces are designed with specific curvature characteristics (convex or concave) to control light paths and reduce distortion and aberrations across the wide field of view, balancing the expansion of imaging coverage with maintenance of image quality.
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 approach allows for the achievement of a larger aperture and a bigger field of view while maintaining image quality, and it also addresses the challenge of miniaturization without compromising performance.
Implementation Method 1
The first lens element to the seventh lens element each comprise an object-side surface facing toward the object side and allowing imaging rays to pass through and an image-side surface facing toward the image side and allowing the imaging rays to pass through
Data Source
AI summary
Present embodiments provide for optical imaging lenses. An optical imaging lens may include at least seven lens elements positioned sequentially from an object side to an image side. Through arrangement of the convex or concave surfaces of the lens elements, the length of the optical imaging lens may be shortened while providing better optical characteristics and imaging quality.