Four-Lens Wide-Angle Assembly Compact Track Length
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Solution Overview
Problem
Current wide-angle lens assemblies have long total track lengths and mediocre imaging quality, which are inadequate for miniaturization and high-performance applications, especially in 360-degree panorama views.
Innovation Solution
A wide-angle lens assembly configuration comprising a first lens with negative refractive power and a concave image-side surface, a second lens with positive refractive power and a convex object-side surface, a third lens with refractive power, and a fourth lens with positive refractive power and a convex image-side surface, where specific parameters such as sagittal heights, air spacings, and focal lengths are optimized to achieve improved miniaturization and imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional wide-angle lens assembly configurations are used, then the field-of-view is large, but the total track length becomes long and imaging quality deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and spacings of the four lens elements. Specifically, it sets the first lens with negative refractive power and the second, third, and fourth lenses with positive refractive powers, along with specific curvature radii and air spacings between lenses, to achieve a compact total track length while maintaining a large field-of-view of 80 degrees or more
Solution Approach 2:
The patent uses composite optical materials with different Abbe numbers for the four lens elements. The first lens uses material with Abbe number 15≤V1<30, the second lens with 20<V2≤35, the third lens with 20<V3≤35, and the fourth lens with 20<V4≤35. This composite material approach corrects chromatic aberrations and improves imaging quality while keeping the lens assembly compact
2Length of stationary object
If conventional wide-angle lens assembly configurations are used, then the total track length is reduced for miniaturization, but imaging quality becomes mediocre
Solution Approach 1:
The patent achieves high imaging quality in a compact design by precisely controlling optical parameters including the refractive powers of each lens element, the curvatures of lens surfaces, and the air spacings between lenses. The specific parameter ranges defined for each lens element enable correction of spherical and chromatic aberrations while maintaining a short total track length
Solution Approach 2:
The patent employs composite optical materials with specifically selected Abbe numbers for each lens element to correct chromatic aberrations. By using materials with different dispersion properties (Abbe numbers between 15-35 for the first lens and 20-35 for the other lenses), the system achieves superior color correction and imaging quality despite the compact form factor
3Area of stationary object
If the field-of-view is increased for larger information capture, then the lens complexity increases, but miniaturization requirements cannot be met
Solution Approach 1:
The patent divides the optical system into four distinct lens elements, each with specific functions: the first lens with negative refractive power for wide-angle light gathering, and the second, third, and fourth lenses with positive refractive powers for focusing and aberration correction. This segmentation allows each element to be optimized independently, achieving a large 80-degree field-of-view while maintaining a compact overall structure
Solution Approach 2:
The four-lens configuration serves multiple functions simultaneously: the first lens provides wide-angle coverage, while the subsequent three lenses collectively perform focusing, spherical aberration correction, and chromatic aberration correction. This multi-functionality approach achieves a large field-of-view with only four elements, avoiding the need for more complex multi-element designs
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 optimized configuration enhances the wide-angle characteristics while ensuring miniaturization, improving imaging quality by effectively distributing light deflection angles and correcting aberrations, resulting in better field-of-view and relative brightness.
Implementation Method 1
a first lens having a negative refractive power
Implementation Method 2
a second lens having a positive refractive power
Implementation Method 3
a third lens having a refractive power; and a fourth lens having a positive refractive power
Data Source
AI summary
The present disclosure provides a wide-angle lens assembly and an imaging device equipped with the wide-angle lens assembly. The wide-angle lens assembly includes, sequentially from an object side to an image side: a first lens having a negative refractive power, where an image-side surface of the first lens is a concave surface; a second lens having a positive refractive power, where an object-side surface of the second lens is a convex surface; a third lens having a refractive power; and a fourth lens having a positive refractive power, where an image-side surface of the fourth lens is a convex surface. A sagittal height SAG12 of the image-side surface of the first lens at a maximum effective radius and the air spacing T12 on the axis between the first lens and the second lens satisfy: 1.5≤SAG12/T12<2.0.