Four-Lens Optical Imaging Assembly for Smartphone Macro Photography
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Solution Overview
Problem
Current smartphone imaging lens assemblies face challenges in achieving high imaging quality and miniaturization while meeting the increasing demands for pixel and image quality, particularly in macro shooting and portable electronic devices.
Innovation Solution
The optical imaging lens assembly is designed with a sequence of lenses, including a first lens with positive refractive power, a second lens with refractive power, a third lens with convex surfaces, and a fourth lens, where the refractive power and surface shapes are optimized to satisfy specific ratios and relationships, such as 2.0<f12/f23<4.0 and 1.5<DT32/ARE32<2.5, to achieve miniaturization and high magnification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is miniaturized to reduce size, then the device compactness is improved, but the imaging quality and magnification capability deteriorate
Solution Approach 1:
The lens assembly is divided into four separate lenses with different refractive powers and surface characteristics. Each lens is optimized for specific functions: the first lens provides positive refractive power for basic focusing, the second lens with convex object-side surface corrects aberrations, the third lens with biconvex shape enhances imaging quality, and the fourth lens completes the optical path. This segmentation allows each component to be miniaturized while maintaining overall imaging performance through coordinated design.
Solution Approach 2:
The patent applies specific parameter relationships to optimize the miniaturized lens assembly: the ratio of combined focal lengths f12/f23 is controlled between 2.0 and 4.0, the ratio DT32/ARE32 is maintained between 1.5 and 2.5, and the axial distances SAG32 and SAG42 satisfy specific inequalities. These parameter constraints ensure that despite the reduced size, the lens assembly achieves high magnification and imaging quality by precisely controlling the optical characteristics of each lens.
2Manufacturing precision
If the refractive power is increased to achieve high magnification, then the imaging capability is improved, but the lens complexity and manufacturing difficulty increase
Solution Approach 1:
Each lens is designed with specific local characteristics: the first lens has positive refractive power for basic focusing, the second lens has a convex object-side surface for aberration correction, the third lens has biconvex surfaces for enhanced imaging quality, and the fourth lens completes the optical path. This local optimization of quality characteristics allows the system to achieve high magnification without requiring excessive complexity in any single lens.
Solution Approach 2:
The patent utilizes curved surfaces, particularly convex surfaces on the second and third lenses, to achieve high magnification and correct optical aberrations. The biconvex shape of the third lens and the convex object-side surface of the second lens are specifically designed to control light paths and improve imaging quality, demonstrating that curvature can achieve high magnification without proportionally increasing complexity.
3Area of moving object
If the field of view is expanded to capture more detail, then the imaging coverage is improved, but the incident angle control and optical quality deteriorate
Solution Approach 1:
The lens assembly is designed with specific parameter relationships that provide optical feedback control: the ratio f12/f23 between 2.0 and 4.0, the ratio DT32/ARE32 between 1.5 and 2.5, and the axial distance constraints ensure that light rays are properly controlled and focused. This feedback mechanism allows the system to maintain optical quality even when the field of view is expanded, as the parameter constraints automatically regulate the incident angles and image formation.
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 a lens assembly that is miniaturized, capable of high magnification, and provides excellent imaging quality, effectively addressing the demands for improved pixel and image quality in smartphone cameras.
Implementation Method 1
a first lens having positive refractive power; a second lens having refractive power; a third lens having refractive power; and a fourth lens having refractive power
Data Source
AI summary
An optical imaging lens assembly is provided, along an optical axis from an object side to an image side, sequentially includes: a first lens having positive refractive power; a second lens having refractive power, and an object-side surface of the second lens being a convex surface; a third lens having refractive power, an object-side surface of the third lens being a convex surface, and an image-side surface of the third lens being a convex surface; and a fourth lens having refractive power. Half of a maximum field-of-view Semi-FOV of the optical imaging lens assembly and a maximum incident angle of a chief ray CRAmax of the optical imaging lens assembly to an electronic photosensitive component satisfy: 2.5<Tan(Semi-FOV+CRAmax)<3.5.