Wide Angle Lens Cemented Design for Aberration Control
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Solution Overview
Problem
Wide angle lenses face challenges in reducing aberrations while maintaining a stable manufacturing and cementing process, as existing designs often require large curvature radii and high refractive indices, leading to increased manufacturing loads and difficulties in achieving optimal optical performance.
Innovation Solution
A wide angle lens design comprising five lenses in four groups, where the fourth and fifth lenses form a cemented lens with specific refractive index and curvature conditions (n4 ≥ 1.632 and 0.5 < R45/f0 < 0.8), and Abbe number (ν4 ≤ 24) to reduce magnification chromatic aberration, along with aspherical surfaces and plastic materials, to minimize manufacturing loads and enhance optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the center radius of curvature of the cemented surface is made small (0.4327mm) to reduce magnification chromatic aberration, then the aberration correction is improved, but the manufacturing process becomes unstable and the load in the process increases
Solution Approach 1:
The patent changes the refractive index parameter of the fourth lens to be 1.632 or higher, which allows the cemented surface radius to be increased to 0.55mm or more while still achieving effective aberration correction. This parameter change resolves the contradiction by finding a new operating point that satisfies both optical performance and manufacturing stability requirements
Solution Approach 2:
The patent uses a composite lens structure where the fourth lens (with high refractive index ≥1.632) is cemented to the fifth lens. This composite design allows the system to achieve both the required optical correction and manufacturability by combining materials with specific properties
2Manufacturing precision
If the curvature of lens surfaces is made large to reduce magnification chromatic aberration, then the optical performance is improved, but the load in the manufacturing and cementing process increases
Solution Approach 1:
By changing the refractive index parameter of the fourth lens to 1.632 or higher, the patent enables the use of larger radius of curvature (0.55mm or more) for the cemented surface. This reduces the surface curvature while maintaining aberration correction effectiveness, thereby reducing the mechanical load and stress during manufacturing and cementing processes
3Manufacturing precision
If the refractive index of the fourth lens is increased to reduce chromatic aberration, then the aberration correction is improved, but the manufacturing complexity and load increase
Solution Approach 1:
The patent specifies a precise refractive index range (1.632 or higher) for the fourth lens material. By setting this specific parameter threshold, the invention achieves effective chromatic aberration correction while providing clear material selection criteria that simplify the manufacturing process and reduce 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 effectively reduces magnification chromatic aberration and chromatic aberration, allows for stable lens manufacturing and cementing processes, and achieves a compact, lightweight lens with improved temperature characteristics and aberration correction.
Implementation Method 1
a cemented lens in which a lens surface on the image side of the fourth lens and a lens surface on the object side of the fifth lens are cemented
Implementation Method 2
at least one of a lens surface on the object side and a lens surface on the image side is an aspherical surface
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A wide angle lens (100) comprises a first lens (11), a second lens (12), a third lens (13), a diaphragm (17), a fourth lens (14) and a fifth lens (15) which are arranged in order from an object side to an image side. The first lens (11) is a negative meniscus lens, the second lens (12) is a negative lens in which at least one of lens surfaces is an aspherical surface, the third lens (13) is a positive meniscus lens or a biconvex lens in which at least one of lens surfaces is an aspherical surface, the fourth lens (14) is a negative meniscus lens or a biconcave lens, and the fifth lens (15) is a biconvex lens. The fourth lens (14) and the fifth lens (15) are plastic lenses which constitute a cemented lens (16). When a refractive index of the fourth lens (14) is "n4", the condition "n4 > 1.6" is satisfied and, when a center radius of curvature of a cemented surface of the cemented lens (16) is "R45" and an effective focal length of the entire lens system is "f0", the condition "0.5 < |R45/f0| < 0.8" is satisfied.