Cemented Lens Group with Aspheric Surfaces for Compact Optical Systems
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Solution Overview
Problem
Conventional optical systems with a large field of view face challenges in achieving a large aperture and short total track length while maintaining compact size, often requiring more lens elements which increase stray light and manufacturing complexities.
Innovation Solution
A photographing optical lens system comprising at least six lens elements, including a cemented lens group with aspheric surfaces and a cemented layer, where the aspheric coefficients of adjacent surfaces differ, reducing stray light and enhancing imaging quality, and one lens element closest to the object has positive refractive power to minimize total track length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more lens elements are used in the optical system, then the imaging quality and field of view can be improved, but the total track length increases and the system becomes less compact
Solution Approach 1:
The patent employs a cemented lens structure where multiple lens elements are integrated into a compact arrangement. The cemented lens group combines multiple refractive elements in a nested configuration, allowing the optical system to achieve complex imaging functions with reduced axial length, thereby resolving the contradiction between imaging quality and compact size
Solution Approach 2:
The patent utilizes aspheric surfaces on the cemented lens elements to correct optical aberrations more effectively than spherical surfaces. The aspheric coefficients are specifically designed to reduce distortion and improve imaging quality while maintaining a compact total track length, addressing the contradiction between image quality and system length
2Illumination intensity
If more lens elements are used to achieve large aperture and wide field of view, then the optical performance is improved, but the amount of stray light increases
Solution Approach 1:
The patent extracts and eliminates stray light paths by carefully designing the cemented lens group configuration. The specific arrangement of lens elements with different refractive indices and aspheric surfaces redirects and minimizes stray light, allowing large aperture design while controlling stray light interference
Solution Approach 2:
The cemented layer acts as an intermediary between adjacent lens elements, providing optical coupling that reduces reflection and stray light. The cemented structure eliminates air-glass interfaces that would otherwise generate additional stray light, enabling large aperture design with controlled stray light levels
3Measurement precision
If more lens elements are used to improve optical performance, then the imaging quality increases, but the manufacturing complexity and difficulty increase
Solution Approach 1:
The patent merges multiple lens elements into cemented lens groups, reducing the total number of separate components that need to be individually manufactured and assembled. This integration simplifies the manufacturing process while maintaining the optical performance benefits of multiple elements, resolving the contradiction between imaging quality and manufacturing ease
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 solution effectively suppresses stray light, improves image quality, and reduces the total track length, addressing the compactness and manufacturing issues of conventional systems while maintaining a large aperture.
Implementation Method 1
The first cemented lens element has a cemented image-side surface being aspheric. The second cemented lens element has a cemented object-side surface being aspheric. An aspheric coefficient of the cemented image-side surface of the first cemented lens element is different from an aspheric coefficient of the cemented object-side surface of the second cemented lens element.
Implementation Method 2
The at least one cemented lens group includes, in order from an object side to an image side, a first cemented lens element, a cemented layer and a second cemented lens element.
Data Source
AI summary
A photographing optical lens system includes at least six lens elements, wherein the photographing optical lens system includes at least one cemented lens group cemented by two of the lens elements adjacent to each other. The at least one cemented lens group includes, in order from an object side to an image side, a first cemented lens element, a cemented layer and a second cemented lens element. The first cemented lens element has a cemented image-side surface being aspheric. The cemented layer has a cemented object-side surface and a cemented image-side surface. The second cemented lens element has a cemented object-side surface being aspheric. An aspheric coefficient of the cemented image-side surface of the first cemented lens element is different from an aspheric coefficient of the cemented object-side surface of the second cemented lens element. One of the lens elements closest to an imaged object has positive refractive power.