Seven-Lens Camera Group for Large Aperture and Miniaturization
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Solution Overview
Problem
Current camera lens assemblies for portable electronic devices face challenges in achieving high imaging quality, large aperture, and miniaturization while meeting diverse market demands for high-pixel, high-resolution, and wide field-of-view requirements.
Innovation Solution
A camera lens group comprising seven lenses with specific refractive powers and surface types, including positive and negative refractive powers, convex and concave surfaces, and optimally arranged center thicknesses, which satisfy conditions such as f/EPD≤1.60, 2≤f2/f6<3, and −3<f/f7≤−2, to achieve a large-aperture, ultra-thin, and wide-angle design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is increased to meet high relative brightness and large-aperture requirements, then the imaging quality and light gathering capability are improved, but the lens assembly size and complexity increase
Solution Approach 1:
The lens assembly is divided into seven distinct lens elements with different refractive powers and surface configurations. Each lens element (L1-L7) is optimized independently with specific convex/concave surface arrangements, allowing the system to achieve large aperture (f/1.6 or larger) while distributing the optical complexity across multiple specialized components rather than requiring a single complex element
Solution Approach 2:
Different regions of the lens assembly are assigned different functional properties. The first lens has a positive meniscus shape with convex object-side surface for light gathering, while subsequent lenses have varying convex/concave configurations (e.g., L2 with convex object-side surface, L3 with concave image-side surface, L7 with biconcave shape) to correct specific aberrations in different parts of the optical path, enabling high relative brightness without uniform complexity throughout
2Manufacturing precision
If the number of lenses is increased to improve imaging quality and correct aberrations, then the imaging performance is enhanced, but the overall lens assembly size increases
Solution Approach 1:
The seven lens elements are arranged in a compact nested sequence along the optical axis from object side to image side. Each lens element is positioned closely with optimized air gaps, creating a nested configuration where L1, L2, L3, L4, L5, L6, and L7 are systematically arranged to minimize the overall axial length while maintaining the corrective function of each element for high imaging quality
Solution Approach 2:
Instead of increasing lens diameter to improve imaging quality, the design uses seven lenses with optimized axial positioning and varying refractive powers. The system transforms the problem from a two-dimensional (diameter-based) solution to a three-dimensional arrangement where axial depth and radial curvature are both optimized, achieving high imaging quality without proportional increase in assembly length
3Volume of moving object
If the lens assembly is miniaturized to meet portability requirements, then the device size is reduced, but the aperture and field-of-view are limited
Solution Approach 1:
The design achieves miniaturization by optimizing key parameters: the focal length ratio f2/f6 is constrained to 2≤f2/f6<3, and the seventh lens focal length ratio f/f7 is constrained to −3<f/f7≤−2. These parameter constraints enable compact lens spacing and reduced element sizes while maintaining the optical performance needed for wide field-of-view and high relative brightness in portable devices
Solution Approach 2:
Each lens element is designed to serve multiple functions simultaneously. For example, the first lens with positive refractive power and convex object-side surface contributes to light gathering (aperture function) while its specific curvature also helps define the field-of-view. The seventh lens with negative refractive power and biconcave shape corrects aberrations while also contributing to the overall focal length control, enabling wide field-of-view in a compact configuration
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 enables a camera lens group with improved imaging quality, large aperture, and miniaturization, effectively addressing the challenges of high sensitivity and diverse market demands by balancing spherical aberrations and distortion, resulting in a lens assembly suitable for portable electronic products.
Implementation Method 1
The first lens has a positive refractive power, and an object-side surface of the first lens may be a convex surface. The second lens may have a positive refractive power, and an object-side surface of the second lens may be a convex surface. The third lens has a refractive power, and an image-side surface of the third lens may be a concave surface.
Data Source
AI summary
The present disclosure discloses a camera lens group. The camera lens group sequentially includes, 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. The first lens has a positive refractive power and a convex object-side surface. The second lens has a positive refractive power and a convex object-side surface. The third lens has a refractive power and a concave image-side surface. The fourth lens has a refractive power. The fifth lens has a refractive power. The sixth lens has a positive refractive power and a convex image-side surface. The seventh lens has a negative refractive power, and a concave object-side surface and a concave image-side surface. A total effective focal length f and an entrance pupil diameter EPD of the camera lens group satisfy: f/EPD≤1.60.