Wide-Angle Lens Assembly for Low-Light Imaging
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Solution Overview
Problem
Existing wide-angle imaging lens assemblies with large apertures, commonly used in portable electronic devices, fail to meet high imaging quality requirements in low-light conditions due to their F-number being 2.0 or above, leading to insufficient light admission and compromised imaging performance.
Innovation Solution
A wide-angle imaging lens assembly with a configuration of four lenses, featuring specific refractive powers and surface types, including concave and convex surfaces, and optimized focal lengths and thicknesses, which allows for increased light admission and improved imaging quality in low-light environments while maintaining miniaturization and high relative illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the F-number is increased to 2.0 or above for miniaturization, then the device size is reduced, but the light admission capability deteriorates
Solution Approach 1:
The patent changes the F-number parameter from conventional values (2.0 or above) to a lower value (below 2.0, specifically 1.3 to 1.9), which fundamentally alters the light admission capability while maintaining compact dimensions. This parameter change enables the lens assembly to admit more light without proportionally increasing size, resolving the contradiction between miniaturization and light admission.
2Illumination intensity
If the F-number is decreased below 2.0 for better light admission, then the imaging quality in low-light conditions is improved, but the device size increases
Solution Approach 1:
The patent implements specific parameter changes including setting the F-number below 2.0 (1.3 to 1.9), controlling the ratio of effective focal length to image height (0.8 to 1.2), and optimizing individual lens focal lengths and spacing. These coordinated parameter changes enable the system to achieve low F-number with compact dimensions, simultaneously improving light admission while controlling size.
Solution Approach 2:
The patent applies local quality by assigning specific refractive powers and surface curvatures to individual lenses within the assembly. The first lens has negative refractive power with specific curvature characteristics, while subsequent lenses have positive refractive powers with optimized surface shapes. This localized optimization of optical properties enables the compact low F-number design to achieve both small size and high light admission capability.
3Illumination intensity
If the aperture is increased for more light admission, then the imaging performance in dark environments is improved, but the edge ray aberrations increase
Solution Approach 1:
The patent optimizes parameters including the F-number (1.3 to 1.9), the ratio of effective focal length to image height (0.8 to 1.2), and individual lens characteristics such as focal lengths and surface curvatures. These parameter optimizations enable the large aperture design to control edge ray aberrations while maintaining high light admission capability, resolving the contradiction between aperture size and aberration control.
Solution Approach 2:
The patent employs local quality through differentiated lens designs with specific refractive powers and surface curvatures. The first lens uses negative refractive power with optimized curvature to control marginal rays, while subsequent lenses use positive refractive powers with specific surface characteristics. This localized optimization of optical properties enables the system to maintain aberration control despite the large aperture, improving imaging performance in dark environments without sacrificing image quality.
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 proposed lens assembly achieves enhanced imaging performance in dark environments by admitting more light and reducing edge ray aberrations, supporting ultra-thin, miniaturized, and high-quality imaging with a large aperture, even in low-light conditions.
Implementation Method 1
The imaging lens assembly includes, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, and a fourth lens. The second lens has a positive refractive power. At least one of the first lens, the third lens, or the fourth lens has a negative refractive power.
Data Source
AI summary
The present disclosure discloses an imaging lens assembly. The imaging lens assembly includes, sequentially along an optical axis from an object side to an image side, a first lens, a second lens, a third lens, and a fourth lens. The object-side surface of the first lens is a concave surface, and the image-side surface of the fourth lens is a concave surface. The second lens has a positive refractive power. At least one of the first lens, the third lens, or the fourth lens has a negative refractive power. An effective focal length f3 of the third lens and an effective focal length f4 of the fourth lens satisfy: f3/f4>0.