Imaging Lens Segmentation for Compact Wide-Angle Design
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Solution Overview
Problem
Current wide-angle imaging lenses for monitoring and vehicle-mounted cameras lack compactness, low F-number capabilities, and sufficient aberration correction, particularly with the increasing demand for high-resolution images from high-pixel density image sensors.
Innovation Solution
The design of an imaging lens comprising a front group with negative and positive refractive power lens groups and a rear group with cemented lenses, optimized by specific focal length and Abbe number conditions, to achieve a wide angle of view, compact size, and low F-number while correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a wide angle lens system is used to achieve a wide field of view, then the field of view is improved, but the lens becomes larger and less compact
Solution Approach 1:
The lens system is divided into multiple lens groups (first lens group with negative refractive power, second lens group with positive refractive power, third lens group with negative refractive power) to achieve wide angle coverage while maintaining compact size through optimized segmentation of optical functions
Solution Approach 2:
The patent applies specific parameter conditions including 0.95 < fAn/f2 < 1.5 where fAn is the focal length of the first lens group and f2 is the focal length of the entire system, to optimize the balance between field of view and lens compactness
2Illumination intensity
If the F-number is reduced to accommodate low light environments, then light gathering capability is improved, but aberration correction becomes more difficult
Solution Approach 1:
Different lens groups are assigned specific refractive power characteristics and aberration correction functions - the first lens group provides negative refractive power with specific aberration correction, the second lens group provides positive refractive power, and the third lens group further corrects aberrations, creating local optimization throughout the system
Solution Approach 2:
The lens system uses composite lens groups with different refractive indices and dispersion characteristics to simultaneously achieve low F-number and effective aberration correction across multiple wavelength ranges
3Volume of moving object
If the lens is made compact for installation space and portability, then device size is reduced, but optical performance deteriorates
Solution Approach 1:
The patent optimizes the dynamic arrangement of lens groups with specific focal length relationships (0.7 < fA/fB < 10 where fA is the focal length of the first lens group and fB is the focal length of the second lens group) to maintain high optical performance within a compact form factor
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 results in a compact, high-performance imaging lens with a wide angle of view and low F-number, effectively addressing the limitations of existing lenses by enhancing optical performance and accommodating high-pixel density image sensors.
Implementation Method 1
a front group having a negative refractive power, a stop, and a rear group having a positive refractive power
Data Source
AI summary
An imaging lens consists of, in order from the object side, a front group having a negative refractive power, a stop, and a rear group having a positive refractive power. The front group consist of a front-group negative lens group that consists of three negative lenses and has a negative refractive power, and a front-group positive lens group that includes one positive lens and one negative lens and has a positive refractive power, where the negative lens is disposed at the most image-side position. The rear group includes two positive lenses and two negative lenses. The imaging lens satisfies condition expression (1): 0.95<−fAn/f<2, where fAn is a focal length of the front-group negative lens group, and f is a focal length of the entire system.