Six-Lens Camera Assembly with Aspheric Inflection Points
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current camera lens assemblies for mobile devices face challenges in achieving high image quality and miniaturization while maintaining a large aperture, especially in low-light conditions and with hand trembling, due to limitations in F-number and lens design.
Innovation Solution
A camera lens assembly comprising a sequence of lenses with specific refractive powers and surface configurations, including aspheric surfaces with inflection points, optimized to achieve a total effective focal length and entrance pupil diameter ratio of ≤1.7, ensuring a large ultra-thin aperture and low sensitivity, thereby enhancing image quality and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the F-number is reduced to increase aperture size for low-light performance, then the aperture diameter increases, but the lens assembly length increases
Solution Approach 1:
The lens assembly is divided into six individual lens elements (first through sixth lenses) with alternating positive and negative refractive powers. This segmentation allows each lens to contribute to the overall optical power while managing the light path efficiently, enabling a larger effective aperture without proportionally increasing the total lens length.
Solution Approach 2:
The patent employs aspheric surfaces with inflection points on several lenses (first, third, fifth, and sixth lenses) to change the geometric parameters of the optical elements. This allows for optimized light ray control that achieves larger aperture performance while maintaining compact lens assembly dimensions by altering the surface curvature parameters rather than simply scaling up all dimensions.
2Length of moving object
If the lens assembly is miniaturized to reduce device thickness, then the total track length decreases, but the aperture size and image quality deteriorate
Solution Approach 1:
The lens design incorporates aspheric surfaces with inflection points that dynamically optimize the light path through non-uniform curvature variations. This allows the optical system to achieve high aperture performance (f/EPD≤1.7) within a miniaturized form factor by creating more efficient light ray trajectories that maximize aperture utilization without increasing physical length.
Solution Approach 2:
The lens assembly uses a composite configuration of six different lens elements with alternating positive and negative refractive powers, where each lens is made of optical material with specific refractive indices. This composite structure enables the system to achieve high aperture performance and good image quality in a compact form by combining the optical effects of multiple materials with different properties.
3Length of moving object
If the lens assembly is miniaturized to reduce device thickness, then the total track length decreases, but the image quality deteriorates
Solution Approach 1:
The patent employs aspheric surfaces with inflection points on multiple lenses to replace traditional spherical surfaces. This curvature modification allows for better correction of optical aberrations (spherical aberration, coma, astigmatism) within the miniaturized lens assembly, maintaining high image quality by creating more complex but optimized light ray paths that converge more precisely on the image sensor.
Solution Approach 2:
Each lens element in the six-lens assembly serves multiple functions: the positive power lenses (first, second, fifth) provide converging power while the negative power lenses (third, sixth) provide diverging power for aberration correction. The aspheric surfaces on these lenses simultaneously perform multiple roles including focusing light, correcting spherical aberration, and controlling field curvature, thereby maintaining high image quality in a compact configuration.
4Manufacturing precision
If aspheric surfaces with inflection points are used to improve optical performance, then the image quality improves, but the manufacturing complexity increases
Solution Approach 1:
The aspheric surfaces with inflection points are applied selectively to specific lenses (first, third, fifth, and sixth lenses) rather than all lenses, based on their specific optical functions. This local application of complex surface geometry focuses the manufacturing complexity only where needed to achieve the desired optical performance improvements, rather than uniformly complicating the entire lens assembly.
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 provides a camera lens assembly with improved image quality and reduced sensitivity, capable of handling low-light conditions and maintaining miniaturization, by optimizing the refractive powers and surface configurations of the lenses.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from an object side to an image side along an optical axis. The first lens, the second lens and the fifth lens have positive refractive powers, and the third lens and the sixth lens have negative refractive powers.
Data Source
AI summary
The present disclosure provides a camera lens assembly. The camera lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from an object side to an image side along an optical axis. The first lens, the second lens and the fifth lens have positive refractive powers, and the third lens and the sixth lens have negative refractive powers. A total effective focal length f of the camera lens assembly and an entrance pupil diameter EPD of the camera lens assembly satisfy: f/EPD≤1.7.