Seven-Lens Camera Group for Low-Light Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing camera lens groups for portable electronic devices face challenges in achieving high imaging quality under both bright and low-light conditions, requiring a balance between miniaturization, large aperture, and good imaging performance across varying lighting situations.
Innovation Solution
A camera lens group comprising seven lenses with specific refractive powers and surface types, including convex and concave surfaces, optimized center thicknesses, and spacing distances, configured to enhance relative brightness and imaging quality, particularly in low-light conditions, while maintaining miniaturization and ultra-thin characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens group is miniaturized and made ultra-thin, then the device size is reduced, but the aperture and imaging quality in low-light conditions deteriorate
Solution Approach 1:
The lens group is divided into seven individual lenses with specific refractive powers and surface curvatures, arranged in a compact sequence. This segmentation allows each lens to contribute to light gathering and focusing, achieving high relative brightness (f/1.65 or larger aperture) within a miniaturized form factor suitable for portable electronic devices
Solution Approach 2:
The patent specifies precise parameter ranges including focal lengths (e.g., 0.52 ≤ f2/f ≤ 1.40, 0.92 ≤ f4/f6 ≤ 1.89), center thickness ratios (CT4/CT5 > 1.5), and spacing distances (e.g., 0.30 ≤ T67/T56 ≤ 13.77) to optimize the balance between miniaturization and aperture performance, enabling ultra-thin design while maintaining large aperture capability
2Length of stationary object
If the lens group is miniaturized, then the device thickness is reduced, but the imaging quality and resolution deteriorate
Solution Approach 1:
The imaging system uses seven lenses with alternating positive and negative refractive powers to correct various optical aberrations (spherical aberration, coma, astigmatism, field curvature, distortion, and chromatic aberration) within a compact thickness, thereby maintaining high imaging quality and resolution despite miniaturization
Solution Approach 2:
The patent defines specific parameter ranges for each lens including focal lengths, center thicknesses, and spacing distances to control optical path and aberration correction, ensuring high imaging quality is achieved within an ultra-thin form factor suitable for portable devices
3Illumination intensity
If the aperture is increased to improve low-light imaging, then the relative brightness is improved, but the lens group size and complexity increase
Solution Approach 1:
The patent achieves a large aperture (f/1.65 or larger) by precisely controlling the focal lengths and spacing of seven lenses, allowing high relative brightness for improved low-light imaging while keeping the overall lens group size compact and suitable for portable electronic devices
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 configuration improves imaging quality in low-light conditions, enhances relative brightness, and supports miniaturization and ultra-thin design, making it suitable for portable electronic products.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers
Data Source
AI summary
A camera lens group is disclosed. The camera lens group includes, 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 having refractive powers. The second lens has a positive refractive power. An object-side surface of the second lens, an object-side surface of the third lens, and an object-side surface of the sixth lens are a convex surface. An image-side surface of the third lens, an image-side surface of the sixth lens, and an image-side surface of the seventh lens are a concave surface. A center thickness CT4 of the fourth lens on the optical axis and a center thickness CT5 of the fifth lens on the optical axis satisfy: CT4/CT5>1.5.