Wide-Angle Lens Design for 130-Degree Viewing Angle
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Solution Overview
Problem
Existing wide-angle lenses with a viewing angle of 130° or more face challenges in terms of yield, productivity, and cost due to the complexity and cost of producing lenses with a shape close to a hemisphere, especially when using glass lenses.
Innovation Solution
A wide-angle lens design featuring six lenses in five groups, including a meniscus-shaped first lens with a convex surface facing the object side and a concave surface facing the image side, and a third lens with negative power and aspherical surfaces, which compensates for the negative power of the first and second lenses, reducing production complexity and costs while improving aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lens face on the image side of the first lens is made close to a hemisphere shape to achieve a viewing angle of 130° or more, then the viewing angle requirement is met, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent changes the curvature radius parameter of the first lens's image-side surface to a specific range (0.5 ≤ R12 < 2.0) to achieve a viewing angle of 130° or more without making the surface close to hemispherical. This parameter optimization allows the lens to meet the wide-angle requirement while maintaining manufacturability and reducing production costs.
2Adaptability or versatility
If the first lens is made as a glass lens with a hemispherical shape to achieve high viewing angle, then the viewing angle requirement is met, but the production cost increases due to difficult work and reduced yield
Solution Approach 1:
The patent optimizes the curvature radius parameter R12 of the first lens to a specific range (0.5 ≤ R12 < 2.0), which enables achieving a viewing angle of 130° or more while avoiding the need for near-hemispherical shapes. This parameter change significantly improves production yield and reduces manufacturing difficulty, thereby lowering production costs.
3Device complexity
If only two lenses with negative power are used to achieve wide viewing angle, then the lens structure is simple, but the aberration correction is insufficient
Solution Approach 1:
The patent divides the negative power function among three separate lenses (first, second, and third lenses) instead of concentrating it in two lenses. Each lens has a specific focal length (f1, f2, f3) that contributes to the overall aberration correction. This segmentation allows for better control and correction of optical aberrations while maintaining a relatively simple lens structure.
Solution Approach 2:
The patent introduces specific parameter relationships between the focal lengths of the three negative power lenses (f1, f2, f3) to optimize aberration correction. By carefully selecting and relating these parameters, the lens system achieves superior aberration correction without significantly increasing structural complexity.
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 wide viewing angle of 130° or more with reduced production costs and improved aberration correction, including astigmatism, comatic aberration, and chromatic aberration, while maintaining lens quality even at high F-values.
Implementation Method 1
a first lens which is a first lens from an object side and is a plastic lens or a glass lens having negative power
Implementation Method 2
the fifth lens and the sixth lens constitute a cemented lens having positive power
Data Source
AI summary
A wide-angle lens may include a first lens having negative power; a second lens being a plastic lens having negative power, wherein at least one of an object side lens face and an image side lens face is an aspherical surface; a third lens being a plastic lens having negative power, wherein at least one of an object side lens face and an image side lens face is an aspherical surface; a fourth lens having positive power; a fifth lens being a plastic lens; a sixth lens being a plastic lens, wherein the fifth lens and the sixth lens constitute a cemented lens having positive power; and a diaphragm disposed between the fourth lens and the cemented lens. The effective focal length “f” and the focal length “f3” may satisfy the relationship: |f/f3|<0.2.