Seven-Lens Assembly for Wide-Angle Low-Distortion Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Miniaturized electronic devices face challenges in providing a lens assembly that matches the performance of large-sized image sensors due to limited lens numbers, making it difficult to achieve wide-angle characteristics and low distortion rates.
Innovation Solution
A lens assembly with at least seven lenses, including a first lens with negative refractive power, a second lens with positive refractive power and an aspherical surface, and a third lens with positive refractive power, designed to satisfy specific refractive index and half-angle of view conditions, facilitating aberration control and wide-angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to match large-sized image sensor performance, then image quality and aberration control improve, but device size and complexity increase
Solution Approach 1:
The patent applies parameter changes by utilizing lenses with high refractive indices (N23≥1.6, N7≥1.6) to achieve superior aberration control with a limited number of lenses. By changing the optical parameters (refractive index) of the lens materials, the system can correct field curvature and other aberrations effectively without needing to increase the lens count, thus resolving the contradiction between manufacturing precision and device complexity
Solution Approach 2:
The patent employs aspherical surfaces on key lenses (at least one of the second or third lenses has an aspherical object side surface) to improve aberration control. The aspherical curvature allows for more effective correction of optical aberrations compared to spherical surfaces, enabling high image quality with a compact lens assembly of limited number of elements
2Volume of moving object
If the lens assembly is miniaturized to fit mobile devices, then device portability improves, but achieving wide-angle characteristics and low distortion becomes difficult
Solution Approach 1:
The patent achieves wide-angle characteristics in a miniaturized lens assembly by changing the optical parameters of the lenses, specifically using high refractive index materials (N23≥1.6, N7≥1.6) and configuring specific focal lengths and curvature radii. This allows the compact lens assembly to achieve HFOV≥50° while maintaining a small form factor suitable for mobile devices
Solution Approach 2:
The patent utilizes the aspherical surface dimensionality to achieve wide-angle characteristics in a compact design. By introducing aspherical curvature (another dimensional aspect of lens surface design), the system can achieve HFOV≥50° and low distortion rates without increasing the overall lens assembly size, effectively resolving the contradiction between miniaturization and wide-angle capability
3Manufacturing precision
If more lenses are added to reduce distortion rate, then optical performance improves, but the lens assembly becomes larger and more complex
Solution Approach 1:
The patent reduces distortion rate by changing the parameters of existing lenses rather than adding more lenses. Specifically, by configuring the focal lengths, curvature radii, and refractive indices of the seven lenses according to the patent's conditional expressions, the system achieves low distortion rates in a compact lens assembly, resolving the contradiction between optical precision and physical length
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 lens assembly achieves miniaturization while maintaining high image quality by controlling aberration and distortion, suitable for large-sized image sensors in miniaturized devices.
Implementation Method 1
a first lens disposed first from the object side may have negative refractive power and may include a concave object side surface and a convex image sensor side surface, a second lens disposed second from the object side may have positive refractive power
Data Source
AI summary
According to an embodiment of the present disclosure, a lens assembly may include at least seven lenses sequentially arranged from an object side to an image sensor side, where a first lens may have negative refractive power and may include a concave object side surface and a convex image sensor side surface, a second lens may have positive refractive power and may include an object side surface and an image sensor side surface at least one of which is aspherical, a third lens may have positive refractive power, one of the second lens and the third lens may have a refractive index of 1.6 or more, the refractive index of the seventh lens disposed seventh from the side may be 1.6 or more, and the lens assembly may have a half-field angle of 50 degrees or more. Various other embodiments are possible.