Seven-Lens Optical Imaging Assembly for Compact High-Quality Imaging
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Solution Overview
Problem
Existing optical imaging lens assemblies in smartphones face challenges in achieving high imaging quality, reducing internal reflection, increasing pixel size, and enhancing illuminance while maintaining a compact design.
Innovation Solution
An optical imaging lens assembly comprising seven lenses with specific refractive powers and configurations, including aspheric surfaces, to optimize focal lengths, thicknesses, and spacings, ensuring f×tan(Semi-FOV)≥5.0 mm and 1.5<CT1/ET1<2.0, among other parameters, to enhance imaging quality and reduce distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses is increased to improve imaging quality, then imaging quality is improved, but device complexity increases
Solution Approach 1:
The optical imaging lens assembly is divided into seven independent lens elements (first lens to seventh lens), each with specific refractive powers and surface characteristics. This segmentation allows each lens to contribute to correcting specific aberrations and improving overall imaging quality while maintaining manageable complexity through modular design
Solution Approach 2:
At least one surface of each lens element is designed as an aspheric surface rather than a simple spherical surface. This curvature variation enables more precise control of light paths, reducing optical aberrations and improving imaging quality without requiring additional lens elements
2Measurement precision
If the focal length is increased to improve pixel size, then pixel size is increased, but the lens assembly size increases
Solution Approach 1:
The patent optimizes multiple parameters simultaneously including the focal length of individual lenses (f1-f7), the ratios of focal lengths to radii of curvature (f1/R1, f2/R3, etc.), and spacing between lenses (T12, T23, T34, T45, T56, T67). These parameter changes enable achieving adequate pixel size while controlling overall assembly size through precise mathematical relationships
3Object-generated harmful factors
If the lens thickness is increased to reduce internal reflection, then internal reflection is reduced, but the lens assembly length increases
Solution Approach 1:
Different regions of each lens surface are designed with different properties - the aspheric surfaces have varying curvature radii across different zones (object-side surface vs. image-side surface, central region vs. peripheral region). This local quality variation optimizes light transmission by reducing internal reflection at critical interfaces while controlling the overall thickness of each lens element
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 high pixels, high illumination, and small distortion with improved imaging quality, facilitating better close-up shots and efficient use of space.
Implementation Method 1
by reasonably setting the refractive power and key technical parameters of the lenses
Implementation Method 2
how to reduce the internal total reflection of the lens assembly, to avoid ghosting
Implementation Method 3
An optical imaging lens assembly comprises, sequentially along an optical axis from an object side to an image side
Data Source
AI summary
Embodiments of the present disclosure provide an optical imaging lens assembly, which comprises, sequentially along an optical axis from an object side to an image side: a first lens, having a positive refractive power; a second lens, having a negative refractive power; a third lens, having a positive refractive power; a fourth lens, having a negative refractive power; a fifth lens, having a positive refractive power; a sixth lens, having a positive refractive power; and a seventh lens, having a negative refractive power. A total effective focal length f of the optical imaging lens assembly and half of a maximal field-of-view Semi-FOV of the optical imaging lens assembly satisfy: f×tan(Semi-FOV)≥5.0 mm; and a center thickness CT1 of the first lens on the optical axis and an edge thickness ET1 of the first lens satisfy: 1.5<CT1/ET1<2.0.