Six-Lens Camera Assembly with f/1.8 Ratio for Low-Light Imaging
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Solution Overview
Problem
Current camera lens assemblies for portable electronic devices face challenges in achieving high image quality and low sensitivity, especially in low-light conditions, due to their limited size and the inability to meet the increasing demands for miniaturization and optical performance.
Innovation Solution
A camera lens assembly comprising six lenses, with specific configurations of focal powers and surface curvatures, including a first lens with positive focal power and a convex object side surface, a second lens with negative focal power and a concave image side surface, and a sixth lens with negative focal power and a concave image side surface at paraxial points, optimized to achieve a total effective focal length to entrance pupil diameter ratio of ≤1.8, enhancing light admission and reducing edge field-of-view aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the F-number is increased to 2.0 or above to achieve miniaturization, then the lens assembly size is reduced, but the image quality and low-light performance deteriorate
Solution Approach 1:
The patent changes the critical parameter of F-number to a lower value (f/1.8 or below) while maintaining compact size through optimized lens configuration. This parameter change enables both miniaturization and improved light admission capability simultaneously, resolving the contradiction between small size and low-light performance.
Solution Approach 2:
The lens assembly is segmented into six individual lenses with specific focal powers arranged in sequence. This segmentation allows each lens to contribute to specific optical functions, enabling the system to achieve both compact size and high light admission capability through coordinated optical design.
2Illumination intensity
If a larger aperture is used to improve low-light performance, then the F-number is reduced, but the lens assembly size increases
Solution Approach 1:
The patent optimizes the spatial arrangement of six lenses along the optical axis, utilizing the dimensional space efficiently. By carefully controlling the axial positions and focal lengths of each lens, the system achieves a large aperture (low F-number) without proportionally increasing the overall lens assembly size, thus resolving the contradiction between light admission and compact size.
3Volume of moving object
If the focal length is reduced to achieve miniaturization, then the lens assembly size is reduced, but the aberration control becomes more difficult
Solution Approach 1:
The lens system is divided into six segments with different focal powers. This segmentation allows the total focal length to be reduced for miniaturization while each individual lens segment can be designed and optimized to control specific aberrations, thereby maintaining manufacturing precision despite the reduced focal length.
Solution Approach 2:
Each lens in the six-lens assembly has specific local optical properties assigned to it. By optimizing the focal power and surface characteristics of each individual lens, the system achieves effective aberration control even with a reduced overall focal length, resolving the contradiction between miniaturization and optical precision.
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 results in improved image quality in dark environments, reduced aberrations, and a compact, ultra-thin lens design suitable for miniaturized portable devices, effectively balancing spherical aberration and field curvature.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens has a positive focal power, the second lens has a negative focal power
Data Source
AI summary
A camera lens assembly, having a total effective focal length f and an entrance pupil diameter EPD, and 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, and a sixth lens, wherein the first lens has a positive focal power, the second lens has a negative focal power, the third lens has a positive focal power, the fourth lens has a positive focal power or a negative focal power, the fifth lens has a positive focal power or a negative focal power, and the sixth lens has a negative focal power. In addition, the total effective focal length f and the entrance pupil diameter EPD satisfy: f/EPD≤1.8.