Wide-Angle Lens Assembly with Cemented Elements for Resolution and Temperature Stability
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Solution Overview
Problem
Current wide-angle lens assemblies fail to simultaneously achieve small F-number, high resolution, and resistance to environmental temperature changes while maintaining good optical performance.
Innovation Solution
A wide-angle lens assembly design comprising specific lenses with varying refractive powers and surface curvatures, including a first lens with negative refractive power, a meniscus lens, biconvex lenses, and a biconcave lens, arranged along an optical axis with a stop and cemented lenses, satisfying specific conditions for focal length, refractive index, and curvature ratios to achieve miniaturization, improved resolution, and temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a conventional wide-angle lens assembly structure is used, then the field of view can be increased, but the F-number becomes large and resolution decreases
Solution Approach 1:
The lens assembly is divided into multiple lens groups with different refractive powers (negative and positive lenses) arranged in a specific sequence. This segmentation allows each lens to contribute to different aspects of light control, enabling wide field of view while maintaining small F-number and high resolution through coordinated action of individual lens elements
Solution Approach 2:
Different lens elements are designed with specific local properties: negative lenses at certain positions control field curvature and expand field of view, while positive lenses at other positions control focal length and maintain resolution. The stop is positioned specifically to control aperture and depth of field, creating local optimization of optical properties throughout the system
2Measurement precision
If the lens assembly is optimized for small F-number and high resolution, then optical performance improves, but resistance to environmental temperature change deteriorates
Solution Approach 1:
The lens assembly uses multiple lens elements with different refractive indices and Abbe numbers (dispersion properties). By carefully selecting and combining lenses with varying thermal-optical parameters, the design compensates for temperature-induced focal length changes and aberration variations, maintaining optical performance across different environmental temperatures
Solution Approach 2:
The lens system employs composite lens structures including cemented lens combinations where lenses with different material properties are bonded together. This composite approach allows thermal expansion and refractive index changes in one lens to be compensated by opposite changes in another lens, providing temperature stability while maintaining high resolution
3Measurement precision
If more lens elements are added to improve resolution, then manufacturing complexity increases
Solution Approach 1:
Multiple lens elements are combined into cemented lens groups where adjacent lenses are bonded together with optical cement. This merging reduces the number of separate air-glass interfaces, simplifies alignment during manufacturing, and reduces overall system complexity while maintaining the resolution benefits of multiple lens elements
Solution Approach 2:
Each lens element in the assembly is designed to serve multiple functions: controlling field curvature, managing chromatic aberration, adjusting focal length, and contributing to overall image quality. This multi-functionality allows the system to achieve high resolution without requiring an excessive number of specialized lens elements, thereby reducing manufacturing 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 decreases the F-number, increases resolution, and resists environmental temperature changes, ensuring good optical performance by optimizing the lens arrangement and refractive properties.
Implementation Method 1
The first lens is with negative refractive power and includes a concave surface facing an image side. The second lens is a meniscus lens with negative refractive power. The third lens is with refractive power. The fourth lens is with positive refractive power
Data Source
AI summary
A wide-angle lens assembly includes a first lens including negative refractive power and a concave surface, a second lens including a meniscus lens with negative refractive power, a third lens, a fourth lens including positive refractive power and a convex surface, a fifth lens including a biconvex lens, a sixth lens including a biconvex lens, a seventh lens including positive refractive power and a convex surface, an eighth lens including a biconcave lens, a ninth lens including negative refractive power, and a stop disposed between the fourth lens and the sixth lens. The eighth lens is disposed between the fifth and seventh lenses and is cemented with at least one lens. The ninth lens is disposed between the fifth lens and an image side. The wide-angle lens assembly satisfies 1.3<A/IH<2.1 where A is a diameter of the stop and 1H is a maximum image height of the wide-angle lens assembly.