Five-Lens Optical Imaging Assembly for Wide Semi-FOV
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Solution Overview
Problem
Current smartphone imaging lens assemblies face challenges in achieving high-resolution imaging with a wide field of view, great depth of field, and high imaging quality, which are essential for enhancing photography capabilities.
Innovation Solution
The optical imaging lens assembly comprises five lenses with specific refractive powers and surface types, including aspheric surfaces, carefully configured to achieve a wide angle, great focal length, and high imaging quality, with parameters such as focal lengths, thickness ratios, and curvature radii optimized to improve image collection and correction of aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional lens assembly is used, then the structure is simple, but the field of view is narrow and imaging quality is insufficient
Solution Approach 1:
The lens assembly is divided into five separate lens elements (first lens E1, second lens E2, third lens E3, fourth lens E4, and fifth lens E5), each with specific refractive powers and surface configurations. This segmentation allows each lens to contribute to expanding the field of view while collectively achieving high imaging quality through coordinated design.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the object-side surface of the first lens, image-side surface of the second lens, object-side surface of the third lens, image-side surface of the third lens, object-side surface of the fourth lens, and image-side surface of the fifth lens. These curved surfaces are specifically designed to expand the field of view to Semi-FOV≥55° while correcting optical aberrations.
2Manufacturing precision
If more lenses are added to improve imaging quality, then imaging quality improves, but the device complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element to achieve high imaging quality: focal length ratios (−4.0<f1/f≤−2.0 and −2.5<(f3+f4)/f5<−1.5), thickness ratios (1.0<ET1/CT1≤2.0 and 2.5<CT4/ET4≤3.5), and curvature radius ratios (−19.5≤R5/R6≤−3.0). These controlled parameter changes optimize imaging quality while managing complexity.
Solution Approach 2:
The lens assembly combines multiple lens elements with different refractive powers (positive and negative) and surface types (convex and concave), including aspheric surfaces, to create a composite optical system that achieves superior imaging quality through the synergistic effect of diverse optical components.
3Manufacturing precision
If the focal length is increased to improve imaging quality, then image collection improves, but the lens assembly length increases
Solution Approach 1:
The five lens elements are arranged in a compact nested configuration along the optical axis, with each subsequent lens positioned to optimize space utilization. This nested arrangement allows the achievement of great focal length and high imaging quality while controlling the overall lens assembly length for portable electronic products.
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 high imaging quality, wide angle, and great focal length, effectively addressing the requirements for enhanced photography in portable electronic products by improving image collection and correcting aberrations.
Implementation Method 1
a first lens with a negative refractive power, an object-side surface thereof is a concave surface, an image-side surface thereof is a convex surface
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 provides an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis: a first lens with a negative refractive power, an object-side surface thereof is a concave surface, an image-side surface thereof is a convex surface; a second lens with a refractive power; a diaphragm; a third lens with a refractive power, an object-side surface thereof is a convex surface, an image-side surface thereof is a convex surface; a fourth lens with a refractive power; and a fifth lens with a refractive power. Semi-FOV is a half of a maximum field of view of the optical imaging lens assembly, and Semi-FOV meets Semi-FOV≥55°.