Nine-Lens Wide-Angle Assembly for Compact Aperture and Thermal Stability
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Solution Overview
Problem
Wide-angle lens assemblies struggle to achieve a large view angle, large aperture, short total length, small bore, and temperature stability, which are essential for various applications.
Innovation Solution
A wide-angle lens assembly comprising specific lenses with negative and positive refractive powers, arranged in a particular configuration along the optical axis, including meniscus, biconcave, and biconvex lenses, with certain focal length and diameter conditions to achieve optimal optical performance and temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of lenses is increased to achieve large view angle and large aperture, then the optical performance is improved, but the total length and bore of the lens assembly increase
Solution Approach 1:
The lens assembly is divided into nine individual lens elements (first lens through ninth lens) with specific refractive power configurations. This segmentation allows each lens to contribute to the overall optical performance while maintaining control over the total length and bore through optimized individual lens designs and arrangements.
Solution Approach 2:
Different lenses within the assembly have different refractive powers (positive and negative) and different surface configurations (convex and concave surfaces). This local differentiation allows each lens element to perform specific optical functions, achieving large aperture and view angle while controlling the overall dimensions through targeted local optimizations.
2Illumination intensity
If the number of lenses is increased to achieve large view angle and large aperture, then the optical performance is improved, but the device complexity increases
Solution Approach 1:
The complex optical system is segmented into nine discrete lens elements with well-defined refractive powers and surface configurations. This segmentation makes the complex system more manageable by allowing independent optimization of each lens element while achieving the overall performance goals of large aperture and view angle.
Solution Approach 2:
The patent specifies precise parameter relationships between different lens elements, including focal length ratios (e.g., -15 < f1/f11.5, -10 < f2/f5.5, -5 < f3/f1.5) and diameter ratios (e.g., 0.8 < TTL/D11). These parameter constraints provide a systematic approach to managing device complexity by establishing clear design rules that guide the configuration of the nine-lens assembly.
3Illumination intensity
If the lens configuration is optimized for large view angle and short length, then the optical performance is improved, but the lens assembly becomes sensitive to ambient temperature variations
Solution Approach 1:
The patent establishes specific parameter ranges and relationships that simultaneously optimize for large view angle and temperature stability. The focal length ratios and diameter ratios are constrained within specific ranges to achieve both optical performance and thermal stability, suggesting that the parameter optimization considers multiple performance criteria including temperature insensitivity.
4Length of stationary object
If the total length and bore are reduced to achieve compact size, then the portability is improved, but the optical performance deteriorates
Solution Approach 1:
The compact lens assembly achieves good optical performance through segmentation into nine lens elements. Each lens element is optimized to contribute to the overall performance, allowing the system to maintain large aperture and view angle while keeping the total length and bore compact through efficient use of each segmented component.
Solution Approach 2:
Different lens elements have different refractive powers and surface configurations tailored to their specific positions and functions within the compact assembly. This local optimization allows each lens to maximize its contribution to optical performance within the constraints of the compact overall dimensions.
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 assembly achieves a wider view angle, minimized aperture and total length, and effective aberration correction while being resistant to ambient temperature variations, as demonstrated by specific focal length and diameter conditions.
Implementation Method 1
The first lens has negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side.
Data Source
AI summary
A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens. The first lens has negative refractive power and includes a concave surface facing an image side. The second lens has negative refractive power and includes a concave surface facing the image side. The third lens has negative refractive power and includes a concave surface facing the image side. The fourth, fifth, seventh and eighth lenses have refractive power. The sixth and ninth lenses are biconvex lenses with positive refractive power. The first to ninth lenses are arranged in order from an object side to the image side along an optical axis.