Wide-angle lens assembly with Abbe number difference for temperature resistance
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Solution Overview
Problem
Existing wide-angle lenses fail to meet the requirements of miniaturization, wide field of view, large aperture, and resistance to environmental temperature changes simultaneously while maintaining good optical performance.
Innovation Solution
A wide-angle lens assembly comprising a specific configuration of lenses with negative and positive refractive powers, including a meniscus lens with a convex surface facing the object side and a concave surface facing the image side, and cemented lenses with aspheric surfaces, optimized for Abbe numbers, refractive indices, and sag distances, which provides a shortened total lens length, decreased F-number, and resistance to severe temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide-angle lens is designed with miniaturization and wide field of view, then the field of view and compactness are improved, but the lens cannot resist environmental temperature changes
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the Abbe numbers and refractive indices of the lens materials. Specifically, it requires that the difference between the Abbe numbers of the fourth and fifth lenses is at least 50 (Vd4−Vd5≥50), and the difference between the refractive indices of the third and first lenses is at least 0.35 (Nd3−Nd1≥0.35). These parameter specifications enable the lens assembly to achieve both wide field of view and resistance to temperature-induced chromatic aberration changes.
2Use of energy by moving object
If a wide-angle lens is designed with large aperture, then the light gathering ability is improved, but the total lens length increases
Solution Approach 1:
The patent divides the lens system into six distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to contribute specifically to light gathering or focal length control, enabling a large aperture (F-number ≤ 2.8) while keeping the total lens length compact (TTL ≤ 3.5mm). The divided structure prevents the need for a single long lens element that would be required in conventional designs.
Solution Approach 2:
The patent employs aspheric surfaces on the second and sixth lenses, which introduces a dimensional change from traditional spherical surfaces. This allows for more efficient light path control and reduced optical path length, achieving large aperture with compact total lens length by utilizing the additional degree of freedom provided by aspheric geometry.
3Length of moving object
If a wide-angle lens is designed with compact size, then the total lens length is reduced, but the optical performance deteriorates
Solution Approach 1:
The patent uses composite lens design with six different lens elements made of materials with specifically selected optical properties. The alternating positive and negative refractive powers, combined with the specified differences in Abbe numbers and refractive indices, create a composite optical system that corrects various aberrations (chromatic, spherical, coma) even in the compact form factor, thereby maintaining high optical performance.
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 achieves a wide field of view, corrected aberrations, and improved optical performance while maintaining resistance to environmental temperature changes, ensuring effective chromatic and spherical aberration correction.
Implementation Method 1
a first lens which is a meniscus lens with negative refractive power, a second lens is with negative refractive power, a third lens is with positive refractive power, a fourth lens is with positive refractive power, a fifth lens is with negative refractive power, and a sixth lens is with positive refractive power
Data Source
AI summary
A wide-angle lens assembly comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens sequentially from an object side to an image side along an optical axis. The first lens is a meniscus lens with negative refractive power. The second lens is with negative refractive power and includes a convex surface facing an object side. The third lens is with positive refractive power and includes a convex surface facing the object side. The fourth lens is with positive refractive power and includes a convex surface facing an image side. The fifth lens is with negative refractive power and includes a convex surface facing the image side. The sixth lens is with positive refractive power. The wide-angle lens assembly satisfies Vd4−Vd5≥50, wherein Vd4 is an Abbe number of the fourth lens and Vd5 is an Abbe number of the fifth lens.