Wide-angle lens with cemented elements for miniaturization and aberration control
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Solution Overview
Problem
Conventional wide-angle lenses fail to meet demands for miniaturization, larger field of view, high resolution, and resistance to environmental temperature changes.
Innovation Solution
A wide-angle lens design comprising specific lens elements with defined refractive powers, curvatures, and aspheric surfaces, including meniscus, biconvex, and biconcave lenses, cemented to form cemented lenses, with a stop positioned between certain elements, optimizing focal lengths and Abbe numbers to achieve a larger field of view, miniaturization, and high resolution while resisting temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional wide-angle lens structure is used, then the lens can be manufactured with standard design, but it fails to achieve miniaturization and larger field of view simultaneously
Solution Approach 1:
The lens is divided into multiple lens elements (first lens with negative refractive power, second lens with positive refractive power, third lens with negative refractive power, and a cemented lens comprising a fourth lens and fifth lens). This segmentation allows each element to contribute differently to the overall optical performance, enabling miniaturization while maintaining or expanding the field of view through optimized light path control.
Solution Approach 2:
The patent applies specific parameter constraints to achieve the desired balance between size and field of view: −5.0 < f1/f < −2.0 (first lens focal length ratio), 2.0 < f2/f < 5.0 (second lens focal length ratio), −3.0 < f3/f < −0.5 (third lens focal length ratio), and −10.0 < f45/f < 5.0 (cemented lens focal length ratio). These parameter optimizations enable compact design while preserving wide-angle characteristics.
2Manufacturing precision
If lens elements are added to increase field of view and resolution, then optical performance improves, but lens complexity and size increase
Solution Approach 1:
The fourth lens and fifth lens are cemented together to form a cemented lens assembly. This merging reduces the number of air-glass interfaces, minimizes internal reflections, and simplifies the overall structure while maintaining high resolution. The cemented design also reduces alignment complexity compared to separate mounted elements.
Solution Approach 2:
The patent specifies that at least one surface of each lens element is an aspheric surface. Aspheric surfaces provide better aberration correction and higher resolution compared to simple spherical surfaces, while requiring only moderate manufacturing precision. This approach achieves high resolution without proportionally increasing structural complexity.
3Manufacturing precision
If lens elements are designed for high resolution, then image quality improves, but resistance to environmental temperature changes deteriorates
Solution Approach 1:
The cemented lens combines fourth and fifth lenses made of different optical materials with complementary thermal and optical properties. By selecting materials with appropriate Abbe numbers and refractive indices, the design achieves high resolution through chromatic aberration correction while the composite structure provides thermal stability, as different materials expand and contract at different rates, compensating for temperature-induced focal shifts.
4Adaptability or versatility
If field of view is increased through lens design, then larger coverage is achieved, but distortion and aberration increase
Solution Approach 1:
Different lens elements are assigned specific functions to correct different types of aberrations in different regions of the field. The first lens (negative power) controls peripheral distortion, the second lens (positive power) corrects field curvature, and the aspheric surfaces on various elements address local aberrations in specific zones. This localized correction approach maintains high image quality across the entire wide field of view.
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 design achieves a larger field of view, miniaturization, high resolution, and resistance to environmental temperature changes, effectively correcting longitudinal aberration, field curvature, and distortion, resulting in improved optical performance.
Implementation Method 1
a first lens L11 having negative refractive power; a second lens L12 including a concave surface facing the object side and having negative refractive power; a third lens L13 having positive refractive power
Implementation Method 2
the surfaces of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens at least one is an aspheric surface
Implementation Method 3
the fourth lens and the fifth lens are cemented to form a cemented lens; the sixth lens and the seventh lens are cemented to form a cemented lens
Data Source
AI summary
A wide-angle lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is a convex-concave lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens is a biconcave lens with negative refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens includes a convex surface facing the object side. The fifth lens is with positive refractive power and includes a convex surface facing the image side. The sixth lens is a biconvex lens with positive refractive power. The seventh lens is a biconcave lens with negative refractive power. The eighth lens is a biconvex lens with positive refractive power.