Five-Element Optical Imaging Lens Compact Design
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Solution Overview
Problem
Designing an optical imaging lens with a shorter length while maintaining good optical characteristics is challenging, especially for smaller mobile devices, due to factors like material nature, production difficulty, and assembly yield, particularly when high view angle and large aperture size are required.
Innovation Solution
The optical imaging lens is designed with five lens elements, controlling the convex or concave shape of surfaces and specific inequalities to shorten the length while sustaining good optical characteristics, including a configuration where the first lens element has negative refracting power, the second has positive power with a convex portion near the optical axis, and subsequent elements have specific refracting power distributions and surface shapes to optimize light collection and aberration adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the length of the optical imaging lens is reduced to make mobile devices smaller, then the size of the mobile device is reduced, but the optical characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refracting power (positive or negative), central thickness, and surface curvature of each of the five lens elements. By optimizing parameters such as the ratio T4/T2 ≤ 1.55 and the distribution of positive and negative refracting powers among elements, the lens achieves compact length while maintaining excellent optical characteristics including wide view angle and large aperture
Solution Approach 2:
The optical imaging lens is segmented into five distinct lens elements with alternating positive and negative refracting powers. This segmentation allows each element to contribute differently to light refraction and aberration correction, enabling the system to achieve high optical performance in a compact configuration that would not be possible with a single element or fewer elements
2Illumination intensity
If the aperture size is increased to improve light collection, then the imaging quality is improved, but the length of the optical imaging lens increases
Solution Approach 1:
The patent controls the aperture size and lens element parameters to achieve a large relative aperture while keeping the lens length short. By optimizing the refracting power distribution and central thickness of each element, the system achieves high light collection capability without proportionally increasing the overall length
3Area of stationary object
If the view angle is increased to expand the field of view, then the imaging coverage is improved, but the optical characteristics deteriorate
Solution Approach 1:
The five-element segmented design with alternating positive and negative refracting powers enables the lens to achieve wide view angle while correcting off-axis aberrations. Each element contributes to expanding the field of view while the collective arrangement maintains image quality across the wide angular range
Solution Approach 2:
The patent optimizes surface curvature parameters and refracting power distribution to achieve wide view angle with maintained optical characteristics. By controlling parameters such as the convex/concave shape of surfaces and the ratio relationships between element thicknesses, the system expands field of view while correcting aberrations
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 effectively reduces the length of the optical imaging lens while ensuring excellent imaging quality, wide view angle, and low f-number, enhancing the assembly yield and maintaining good optical characteristics.
Implementation Method 1
each of the first, second, third, fourth and fifth lens elements having refracting power
Data Source
AI summary
Present embodiments provide for mobile devices and optical imaging lenses thereof. An optical imaging lens may comprise five lens elements positioned sequentially from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens may exhibit better optical characteristics and the total length of the optical imaging lens may be shortened.