Five-Lens Optical Imaging Assembly for Compact Wide-Angle Design
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Solution Overview
Problem
Current optical imaging lens assemblies for portable electronic devices, such as smartphones, face challenges in achieving a balance between wide-angle capabilities, high imaging quality, and compact size, while maintaining effective refractive power and minimizing aberrations.
Innovation Solution
The optical imaging lens assembly consists of five lenses with specific refractive powers and surface types, including aspheric surfaces, carefully configured to achieve a wide angle, high imaging quality, and compact structure, with parameters such as TTL/ImgH < 1.5, Semi-FOV/CRAmax > 1.0, and 3.0 < DT51/DT11 < 4.0, ensuring an ultra-thin and efficient design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide-angle lens is designed with a large visual angle and wide visual field, then the scenery range and perspective effect are improved, but the lens size and complexity increase
Solution Approach 1:
The lens assembly is divided into five individual lenses with specific refractive powers arranged sequentially along the optical axis. Each lens is optimized for specific aberration correction, allowing the system to achieve wide-angle capability (120° field of view) while maintaining compact size through specialized segmentation of optical functions.
Solution Approach 2:
Different regions of the lens assembly are assigned different optical properties. The first lens has positive refractive power for light convergence, while subsequent lenses have negative refractive powers for aberration correction. The aspheric surfaces are strategically positioned to correct specific types of aberrations in specific regions, optimizing performance within a compact structure.
2Manufacturing precision
If multiple lenses are added to improve imaging quality and reduce aberrations, then the refractive power balance and image quality are improved, but the device complexity and size increase
Solution Approach 1:
The optical system is segmented into five lenses with specific refractive powers: the first lens has positive refractive power while the second, third, and fifth lenses have negative refractive powers. This segmentation allows each lens to be optimized for specific functions, achieving superior imaging quality and aberration correction without excessive complexity.
Solution Approach 2:
The lens assembly optimizes specific parameters including the ratio TTL/ImgH < 1.5, the aspheric surface coefficients, and the spacing between lenses. These parameter optimizations enable the five-lens system to achieve high imaging quality while maintaining compact dimensions and manageable complexity.
3Volume of moving object
If the lens assembly is made compact with small TTL and ImgH ratio, then the portable device size is reduced, but the refractive power and imaging capability may be compromised
Solution Approach 1:
The lens assembly achieves compact size with TTL/ImgH < 1.5 while maintaining adequate refractive power through optimized lens parameters. The aspheric surface coefficients and lens spacing are carefully tuned to ensure that the compact structure does not compromise optical performance, achieving both small size and sufficient refractive capability.
Solution Approach 2:
The lens assembly uses composite optical design combining lenses with different refractive indices and aspheric surface properties. This composite approach allows the system to achieve compact dimensions while maintaining the necessary refractive power and imaging quality through the synergistic combination of different optical elements.
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 results in an optical imaging lens assembly that provides a wide angle, high imaging quality, and compact size, effectively addressing the challenges of refractive power balance and aberration reduction, suitable for various portable electronic products.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens and a fifth lens with refractive power respectively
Implementation Method 2
the object-side surface of the first lens to an image-side surface of the fifth lens include at least one aspheric mirror surface
Data Source
AI summary
The disclosure discloses an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens and a fifth lens with refractive power respectively, wherein TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical imaging lens assembly on the optical axis, and ImgH is a half of a diagonal length of an effective pixel region on the imaging surface of the optical imaging lens assembly, TTL and ImgH meet TTL/ImgH<1.5; and a sum fp of effective focal lengths of the lenses with positive refractive power in the first lens to the fifth lens and a sum fm of effective focal lengths of the lenses with negative refractive power in the first lens to the fifth lens meet −19.0<fm/fp<−10.0.