Seven-Lens Optical Imaging System for Wide-Angle High-Resolution Imaging
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Solution Overview
Problem
Current optical imaging systems for portable devices face challenges in achieving a balance between wide-angle, large aperture, and high image quality, particularly in meeting the diverse user demands for improved pixel density, resolution, and field-of-view while maintaining high image quality.
Innovation Solution
The optical imaging system comprises seven lenses with specific refractive power distributions, surface shapes, and center thickness configurations, including aspheric surfaces, to achieve a wide angle and large aperture, effectively compensating for low-order aberrations and improving image quality across the field-of-view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the field-of-view is increased to meet diverse user demands, then the wide-angle capability is improved, but the image quality deteriorates due to increased aberrations
Solution Approach 1:
The optical imaging system is divided into seven separate lens elements with different functions. The first lens (negative power) handles wide-angle light collection, while subsequent lenses (positive and negative power combinations) progressively correct aberrations. This segmentation allows each element to be optimized for its specific function, enabling both wide field-of-view and high image quality.
Solution Approach 2:
Different regions of the optical system are assigned different properties: the first lens has a concave object-side surface optimized for wide-angle entry, the fourth lens has specific focal length characteristics for aberration control, and the seventh lens has specific curvature ratios for final image quality optimization. Each lens element's local optical properties are tailored to address specific aberrations in different field regions.
2Illumination intensity
If the aperture is increased to improve light collection, then the relative brightness is improved, but the aberrations increase and image quality deteriorates
Solution Approach 1:
The system merges multiple lens elements with complementary functions into a unified optical system. The combination of negative power lenses (first, third, fourth, seventh) and positive power lenses (second, fifth, sixth) creates a synergistic effect where the aperture can be enlarged for brightness while the distributed aberration correction across all elements maintains image quality.
Solution Approach 2:
The optical system uses composite lens design with different refractive indices and Abbe numbers. The fourth lens has refractive index >1.60 and the seventh lens has refractive index >1.60, creating a composite optical structure that handles chromatic and monochromatic aberrations differently, enabling large aperture operation with maintained image quality.
3Manufacturing precision
If more lens elements are added to improve image quality, then the aberration correction is improved, but the device complexity increases
Solution Approach 1:
The patent extracts and addresses specific aberration types at specific locations in the optical path. Rather than using a single complex lens, the system takes out specific correction functions into separate elements: the fourth lens specifically addresses field curvature and astigmatism with its focal length ratio constraint, while the seventh lens specifically corrects distortion and lateral color with its curvature ratio constraint. This modular extraction simplifies the design process despite the seven-element complexity.
4Measurement precision
If the pixel density and number of pixels are increased, then the resolution is improved, but the demand for optical imaging performance increases making it harder to maintain image quality
Solution Approach 1:
The optical system is designed with dynamic optimization across the field-of-view. The semi-FOV≥55° specification indicates the system dynamically adapts to wide-angle imaging requirements. The aspheric surfaces on selected lenses allow the optical properties to dynamically vary across the aperture, providing consistent image quality from center to edge even at high pixel densities where aberration sensitivity is increased.
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 enables the optical imaging system to achieve a wide angle, large aperture, and high image quality, effectively addressing the limitations of prior art by enhancing the system's ability to collect information and maintain image clarity across a larger field-of-view.
Implementation Method 1
Each of the first lens to the seventh lens has refractive power
Implementation Method 2
the object-side surface of the first lens to an image-side surface of the seventh lens may have at least one aspheric surface
Data Source
AI summary
The present disclosure discloses an optical imaging system including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Each of the first lens to seventh lens has refractive power. An object-side surface of the first lens is concave, and an image-side surface thereof is concave; an object-side surface of the second lens is convex, and an image-side surface thereof is convex; and an object-side surface of the third lens is concave, and an image-side surface thereof is convex. An effective focal length f4 of the fourth lens and a total effective focal length f of the optical imaging system satisfy −2.0<f4/f<−1.5. Half of a maximal field-of-view Semi-FOV of the optical imaging system satisfies Semi-FOV≥55°.