Nine-Lens Optical Imaging Assembly for Compact High-Resolution Smartphone Cameras
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Solution Overview
Problem
The challenge in developing an optical imaging lens assembly for portable electronic devices, such as smartphones, is to achieve high imaging quality with a compact size while minimizing aberrations and optimizing light admission, given the constraints of pixel size and manufacturing complexity.
Innovation Solution
The optical imaging lens assembly consists of nine lenses, each with specific refractive powers and surface types, arranged to satisfy certain ratios and configurations that control focal lengths, radii of curvature, and air spacings, ensuring a balanced distribution of refractive powers and minimizing aberrations, thereby enhancing imaging quality and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses in the camera lens group is increased to improve imaging performance, then the imaging quality is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the optical system into nine distinct lens elements with specific refractive power distributions. Each lens element is designed with particular surface curvatures and materials to address specific aberrations, allowing the complex imaging task to be segmented into manageable functional units that can be optimized independently while contributing to overall system performance
Solution Approach 2:
Different regions of the lens assembly are assigned different functional characteristics. For example, certain lens elements have positive refractive power while others have negative refractive power, and specific surfaces are designed with particular curvature radii to correct aberrations in specific field regions. This local optimization allows high imaging quality across the entire image plane without requiring uniform complexity throughout the system
2Measurement precision
If the pixel size of the photosensitive element is reduced to increase resolution, then the imaging resolution is improved, but the light admission capability deteriorates
Solution Approach 1:
The patent optimizes the f-number (f/EPD ratio) of the lens assembly to balance resolution and light admission. By carefully controlling the effective focal length relative to the entrance pupil diameter, the system achieves high resolution suitable for small pixel sizes while maintaining adequate light gathering capability. The refractive power distribution across the nine lenses is specifically tuned to achieve this optimal f-ratio
3Volume of moving object
If the lens assembly size is reduced to achieve compactness, then the portability is improved, but the aberration control capability deteriorates
Solution Approach 1:
The patent employs a compact arrangement where nine lens elements are tightly integrated along the optical axis with minimized air spacings. The lens elements are positioned and sized to fit within a compact form factor while maintaining the necessary optical path lengths for aberration control. This nested configuration allows the system to achieve high imaging quality in a reduced overall volume suitable for portable devices
4Measurement precision
If the refractive power distribution is optimized to reduce aberrations, then the imaging quality is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent selects specific radius of curvature values for each lens surface that balance aberration correction with manufacturability. By carefully choosing these geometric parameters within practical ranges, the design achieves superior imaging quality while ensuring that the lens elements can be manufactured with standard precision capabilities. The refractive power distribution is also optimized to minimize the extreme curvatures required
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 with improved imaging quality, reduced aberrations, and increased light admission, suitable for high-resolution imaging in a compact form factor, addressing the need for enhanced performance in portable devices.
Implementation Method 1
an optical imaging lens includes, sequentially along an optical axis from an object side to an image side: a first lens having a refractive power; a second lens having a positive refractive power; a third lens having a refractive power
Data Source
AI summary
An optical imaging lens assembly is provided. The optical imaging lens assembly includes, sequentially along an optical axis from an object side to an image side: a first lens, having a refractive power; a second lens, having a positive refractive power; a third lens, having a refractive power; a fourth lens, having a refractive power; a fifth lens, having a refractive power; a sixth lens, having a refractive power; a seventh lens, having a refractive power; an eighth lens, having a negative refractive power, an object-side surface of the eighth lens being a concave surface; and a ninth lens, having a refractive power. Here, an effective focal length f of the optical imaging lens assembly and an entrance pupil diameter EPD of the optical imaging lens assembly satisfy: f/EPD<1.9.