Six-Lens Optical Imaging Assembly for Compact Wide-Field Imaging
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Solution Overview
Problem
The design of lens assemblies for mobile devices faces challenges in achieving miniaturization, lightweight, and high imaging quality due to the demands of miniaturization and performance improvement of electronic products and image sensors, limiting design freedom.
Innovation Solution
An optical imaging lens assembly with a six-piece structure, featuring specific refractive powers and surface types of lenses, including concave and convex surfaces, and optimized thicknesses and spacings, to achieve a TTL/ImgH ratio of less than 1.5 and other conditional expressions, ensuring miniaturization and good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is miniaturized to meet mobile device requirements, then the size and weight are reduced, but the imaging quality deteriorates
Solution Approach 1:
The lens assembly is divided into six individual lens elements (first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, and sixth lens E6), each with specific refractive powers and surface configurations. This segmentation allows each lens to contribute differently to the overall optical performance, enabling miniaturization while maintaining imaging quality through optimized individual element design and arrangement.
2Manufacturing precision
If the lens assembly is designed with a wide field-of-view and large aperture, then the imaging quality is improved, but the size and complexity increase
Solution Approach 1:
The patent specifies precise parameter relationships to achieve wide field-of-view (FOV≥75°) and large aperture (f/EPD≤2.0) while controlling size. Key parameters include the TTL/ImgH ratio (≤1.5), focal length ratios (f4/f1, f4/f, f2/f1, f2/f6), and thickness ratios (ET6/ET4, CT3/ET3). These parameter optimizations enable high imaging quality in a compact form factor.
3Manufacturing precision
If more lens elements are added to improve imaging quality, then the optical performance is enhanced, but the device complexity and weight increase
Solution Approach 1:
Each lens element in the six-piece assembly is designed with multi-functional surfaces that simultaneously correct multiple types of optical aberrations. For example, the aspheric surfaces of various lenses contribute to both spherical aberration correction and field curvature optimization, reducing the need for additional specialized correction elements and simplifying the overall structure.
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 lens assembly achieves miniaturization, lightweight characteristics, and maintains high imaging quality with a wide field-of-view and large aperture, effectively addressing the design challenges of mobile device lenses.
Implementation Method 1
a first lens E1 having a positive refractive power, an object-side surface S1 of the first lens E1 being a convex surface, and an image-side surface S2 of the first lens E1 being a concave surface; a second lens E2 having a negative refractive power, an object-side surface S3 of the second lens E2 being a concave surface, and an image-side surface S4 of the second lens E2 being a concave surface
Data Source
AI summary
The present disclosure provides an optical imaging lens assembly. The optical imaging lens assembly includes, sequentially along an optical axis from an object side to an image side: a stop; a first lens, having a refractive power; a second lens, having a refractive power, an object-side surface of the second lens being a concave surface; a third lens, having a positive refractive power; a fourth lens, having a negative refractive power, an object-side surface of the fourth lens being a convex surface; a fifth lens, having a refractive power; and a sixth lens, having a refractive power. A distance TTL from an object-side surface of the first lens to an image plane of the optical imaging lens assembly along the optical axis and half of a diagonal length ImgH of an effective pixel area on the image plane of the optical imaging lens assembly satisfy: TTL/ImgH<1.5.