Seven-Lens Camera Group Balancing Wide Field of View and Low Distortion
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Solution Overview
Problem
Camera lens groups for portable electronic devices face challenges in achieving a high zoom ratio while maintaining image quality, as large field-of-view lenses often result in significant distortion, leading to deformed images and reduced image quality.
Innovation Solution
A camera lens group comprising seven lenses with specific refractive powers and surface curvatures, including negative, positive, and zero refractive power lenses, is designed to achieve a maximum field-of-view greater than 133° while controlling distortion below 25%, optimizing the arrangement of lenses along the optical axis to minimize aberrations and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a large field-of-view lens assembly is used to achieve a short focal length and collect more information, then the field of view is increased, but the distortion increases significantly causing image deformation
Solution Approach 1:
The lens group is divided into seven individual lens elements with alternating positive and negative refractive powers, arranged in a specific sequence. This segmentation allows each lens element to contribute differently to the overall optical performance, with some elements optimized for wide-angle performance and others for distortion control, thereby achieving both large field of view and low distortion simultaneously
Solution Approach 2:
Different lens elements are designed with specific local optical properties: the first lens has negative refractive power with a convex object-side surface to expand field of view, while the second lens has positive refractive power to correct distortion. Each lens element's curvature, thickness, and material are locally optimized to perform its specific function within the overall system
2Adaptability or versatility
If multiple lens assemblies are combined to achieve high zoom ratio, then the zoom capability is improved, but the device complexity increases
Solution Approach 1:
The lens group is designed as a universal optical system that can function as both a wide-angle lens and a telephoto lens by adjusting the spacing between lens elements. The first lens unit can be moved relative to the second lens unit, allowing the same physical assembly to achieve different focal lengths and zoom ratios without requiring separate lens modules for each function
Solution Approach 2:
Multiple lens elements with different refractive powers are merged into a single integrated lens group rather than using separate lens assemblies. The combination of seven lens elements in one compact group achieves the optical equivalent of multiple lens modules, reducing mechanical complexity while maintaining zoom capability
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 solution effectively balances a large field-of-view with low distortion, enhancing image quality and facilitating the production and application of camera lens groups in portable electronic products by reducing spherical and chromatic aberrations.
Implementation Method 1
a first lens having negative refractive power, a convex object-side surface and a concave image-side surface; a second lens having refractive power, a convex object-side surface and a concave image-side surface; a third lens having positive refractive power
Data Source
AI summary
The present disclosure discloses a camera lens group including, sequentially from an object side to an image side along an optical axis, a first lens having negative refractive power, a convex object-side surface and a concave image-side surface; a second lens having refractive power, a convex object-side surface and a concave image-side surface; a third lens having positive refractive power, a convex object-side surface and a convex image-side surface; a fourth lens having refractive power; a fifth lens having refractive power and a concave object-side surface; a sixth lens having positive refractive power, a convex object-side surface and a convex image-side surface; and a seventh lens having negative refractive power. A maximum field-of-view FOV of the camera lens group satisfies: FOV>133.0°. An amount of distortion of the camera lens group is below 25.0%.