Seven-Lens Optical Assembly with Cemented Elements for Aberration Control
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Solution Overview
Problem
Current lens assemblies fail to simultaneously achieve a large field of view, high resolution, and resistance to environmental temperature changes while maintaining good optical performance.
Innovation Solution
A lens assembly design comprising specific lenses with varying refractive powers and curvatures, including a meniscus lens, biconvex lenses, and biconcave lenses, arranged along an optical axis with cemented lenses to reduce color aberration, and incorporating aspheric surfaces to satisfy specific focal length and curvature ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lens assembly is designed for large field of view, then the field of view increases, but optical performance deteriorates
Solution Approach 1:
The lens assembly is divided into multiple lens elements (first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens) with different refractive powers and surface curvatures. Each lens element contributes to correcting specific aberrations while collectively providing a large field of view, thereby maintaining optical performance across the expanded field.
Solution Approach 2:
Different lens elements are assigned specific functions: the first lens has negative refractive power for field expansion, the second meniscus lens corrects distortion, the third lens with concave object-side surface addresses spherical aberration, and cemented lenses (fifth and sixth) reduce chromatic aberration. This localized optimization of each element's properties enables simultaneous achievement of large field of view and high optical quality.
2Measurement precision
If a lens assembly is designed for high resolution, then resolution increases, but resistance to environmental temperature change deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element, including refractive powers, surface curvatures (e.g., R31/R32 ratio for the third lens), and thicknesses. These controlled parameter variations allow the optical system to maintain high resolution while compensating for thermal expansion and refractive index changes across different temperatures, thereby improving temperature stability.
Solution Approach 2:
The lens assembly uses multiple lens materials with different thermal and optical properties. The cemented lenses (fifth and sixth lenses) combine materials with complementary characteristics to reduce chromatic aberration while maintaining dimensional stability across temperature ranges, enabling both high resolution and environmental resistance.
3Reliability
If cemented lenses are added to reduce color aberration, then optical performance improves, but device complexity increases
Solution Approach 1:
The fifth lens and sixth lens are cemented together to form a combined lens element with negative refractive power. This merging of two lenses into a single cemented unit reduces the number of air-glass interfaces, minimizes reflections, and simplifies the overall assembly while effectively correcting chromatic aberration through the complementary properties of the combined lenses.
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 increases the field of view, resolution, and resistance to environmental temperature changes while correcting aberrations, ensuring good optical performance.
Implementation Method 1
The fifth lens and the sixth lens are cemented. The combined focal length of the fifth lens and the sixth lens is with negative refractive power, the lens assembly includes at least one cemented lens to reduce color aberration.
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens is with negative refractive power. The second lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side. The third lens includes a concave surface facing the object side. The fourth lens is with positive refractive power and includes a convex surface facing the object side. The fifth lens includes a convex surface facing the image side. The sixth lens is with negative refractive power. The seventh lens is with positive refractive power and includes a convex surface facing the object side. The fifth lens and the sixth lens are cemented.