Seven-Lens Optical Imaging System Compact Design
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Solution Overview
Problem
Telescopic optical imaging systems are typically large, making it difficult to mount them in small electronic devices like portable terminals due to a high ratio of overall length to focal length, which hinders miniaturization and affects resolution and angle of view.
Innovation Solution
An optical imaging system comprising seven lenses with specific refractive powers and surface configurations, including aspherical surfaces, that satisfy certain refractive index and focal length conditions, allowing for a compact design while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a telescopic optical imaging system is designed to capture distant objects with high resolution and wide angle of view, then the image quality and field of view are improved, but the overall length of the system increases making it difficult to mount in small electronic devices
Solution Approach 1:
The optical system is divided into seven distinct lens elements with specific refractive powers and surface configurations. Each lens element (first through seventh lenses) performs specific optical functions, allowing the system to achieve telescopic imaging capabilities while maintaining a compact overall length through optimized segmentation of optical power distribution
Solution Approach 2:
The patent applies parameter changes by specifying precise refractive index ranges (Nd2, Nd5, Nd7) and focal length relationships for each lens element. The conditional expressions define specific parameter ranges that enable the system to achieve both compact size and high-resolution distant object capture by optimizing the optical parameters of each component
2Length of moving object
If the ratio of overall length to focal length is reduced for miniaturization, then the device size is reduced, but the ability to capture distant objects with high resolution and wide angle of view deteriorates
Solution Approach 1:
The optical system employs asymmetric lens configurations with specific surface curvatures (convex and concave surfaces) and refractive power distributions that are not uniformly symmetric. The seventh lens specifically has a convex object-side surface and convex image-side surface, creating asymmetric optical paths that enable compact design while maintaining telescopic imaging performance
Solution Approach 2:
The patent utilizes aspheric surfaces on the lens elements to optimize light path control. The curved surfaces with specific radii of curvature enable the system to achieve both compact overall length and high-resolution imaging by precisely controlling ray trajectories through optimized surface geometries
3Volume of moving object
If the optical system is compacted for portable device integration, then the device portability is improved, but the angle of view and resolution for distant objects are reduced
Solution Approach 1:
The optical system is designed with movable lens elements that can adjust their positions relative to each other. This dynamic configuration allows the system to maintain focus and optimize performance for distant objects while keeping the overall system volume compact, enabling the angle of view to be adjusted without increasing the physical footprint
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 system achieves a compact form factor suitable for small devices while maintaining the ability to capture distant objects with high resolution and a wide angle of view, correcting aberrations and facilitating astigmatism and chromatic aberration correction.
Implementation Method 1
an optical imaging system includes a first lens having a convex image-side surface, a second lens having a convex object-side surface, a third lens having a concave image-side surface, a fourth lens having a concave object-side surface, a fifth lens having a concave image-side surface, a sixth lens having a concave object-side surface, and a seventh lens
Data Source
AI summary
An optical imaging system includes a first lens having a convex image-side surface, a second lens having a convex object-side surface, a third lens having a concave image-side surface, a fourth lens having a concave object-side surface, a fifth lens having a concave image-side surface, a sixth lens having a concave object-side surface, and a seventh lens having refractive power. The first to seventh lenses are sequentially disposed to be spaced apart from each other by an interval in a direction from an object side toward an imaging plane.