Five-Element Imaging Lens with Concave First Surface
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Solution Overview
Problem
Conventional imaging optical systems struggle to balance imaging quality, sensitivity, aperture size, volume, and angle of view, particularly in compact electronic devices with high zoom ratios and miniaturization requirements.
Innovation Solution
An imaging optical lens assembly comprising five optical elements with refractive power, where the first optical element has a concave object-side surface and a convex image-side surface, the third optical element has negative refractive power, and the fifth optical element has a concave image-side surface, optimized to satisfy conditions such as ΣCT/CT1 < 3.0, which allows for compact design and improved imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional imaging optical systems are used, then imaging quality can be maintained, but the system volume and thickness cannot be reduced sufficiently for compact electronic devices
Solution Approach 1:
The patent applies parameter changes by optimizing the ratio of total axial thickness to first element axial thickness (ΣCT/CT1) to be less than 3.0, and by specifying particular curvature ratios (R1/R2 between -0.5 and -2.0) for the first optical element. These parameter optimizations enable compact design while maintaining imaging quality through precise control of optical path geometry.
Solution Approach 2:
The patent employs composite optical系统设计 combining multiple optical elements with different refractive powers and surface curvatures. The system integrates a first element with positive refractive power and specific concave-convex surface configuration, combined with subsequent elements, creating a composite optical system that achieves both miniaturization and high imaging performance.
2Volume of moving object
If the optical system is miniaturized, then volume is reduced, but aberration correction becomes more difficult
Solution Approach 1:
The patent uses parameter changes by defining specific curvature radius ratios (R1/R2) for the first optical element's surfaces, and controlling the axial thickness ratio (ΣCT/CT1 < 3.0). These parameter optimizations enable effective aberration correction within a miniaturized form factor by precisely controlling light path geometry.
Solution Approach 2:
The patent segments the optical system into multiple functional elements, with the first optical element specifically designed with concave object-side surface and convex image-side surface. This segmentation allows each element to be optimized for specific functions including aberration correction, while collectively achieving compact system volume.
3Adaptability or versatility
If the first optical element has a concave object-side surface, then angle of view can be increased, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the curvature radius ratio (R1/R2) of the first optical element's surfaces to fall within -0.5 to -2.0. This parameter optimization enables increased angle of view while keeping the concave-convex surface configuration manufacturable through standard optical fabrication processes.
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
The proposed imaging optical lens assembly achieves a balance between compact size and high imaging quality, enabling efficient miniaturization while maintaining effective optical performance, including improved aberration correction and reduced thickness.
Implementation Method 1
five optical elements with refractive power... The first optical element has an object-side surface being concave in a paraxial region thereof
Data Source
AI summary
An imaging optical lens assembly includes five optical elements with refractive power. The five optical elements, in order from an object side to an image side along an optical path, are a first optical element, a second optical element, a third optical element, a fourth optical element, and a fifth optical element. The first optical element has an object-side surface being concave in a paraxial region thereof. The third optical element has negative refractive power.