Super Wide Angle Optical System Using Irrotational Symmetric Lenses
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Solution Overview
Problem
Conventional optical systems for cameras, such as those for automobiles, face challenges in achieving a wide viewing angle while maintaining subminiaturization and low manufacturing costs, as they often require rotationally symmetric lenses that increase system length and diameter, leading to unnecessary image areas and obstacles in achieving the desired optical properties.
Innovation Solution
A super wide angle optical system is designed with a first lens group having negative refractive power and an aperture stop to intercept unnecessary light, combined with a second lens group having positive refractive power, utilizing irrotational symmetric and aspheric lens surfaces to achieve a wider horizontal viewing angle than vertical, while adhering to specific conditional expressions for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If rotationally symmetric lenses are used to achieve wide viewing angle, then the viewing angle is improved, but the system length and lens diameter are increased
Solution Approach 1:
The patent employs irrotational symmetric lens surfaces instead of traditional rotationally symmetric lenses. The lens surfaces are defined by asymmetric mathematical equations with different coefficients for different directions, allowing the optical system to achieve wide viewing angles without requiring increased system length or lens diameter. This asymmetric design enables compact dimensions while maintaining superior wide-angle optical performance.
2Illumination intensity
If rotationally symmetric lenses are used to provide peripheral light amount, then the light amount is improved, but the device complexity and manufacturing cost are increased
Solution Approach 1:
The patent uses irrotational symmetric lens surfaces with asymmetric mathematical formulations that provide optimized light distribution across the image plane. The asymmetric surface profiles naturally direct light rays to achieve uniform illumination including peripheral areas, eliminating the need for complex multi-element rotationally symmetric lens groups while reducing overall system complexity and manufacturing cost.
3Shape
If rotationally symmetric lenses are used to achieve wide viewing angle, then the viewing angle is improved, but unnecessary image areas are generated
Solution Approach 1:
The patent employs irrotational symmetric lens surfaces that are specifically designed to match the rectangular format of modern image sensors. The asymmetric surface profiles control light ray paths to precisely fill the rectangular image area without creating unnecessary circular or distorted image regions, thereby maximizing the effective use of the image sensor area and eliminating waste of imaging resources.
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 system effectively achieves a viewing angle of 130 degrees or more between the long axis and image plane, reducing manufacturing costs and improving optical properties by controlling aberrations and brightness, thus enabling subminiaturization without compromising image quality.
Implementation Method 1
a first lens group including one or more of irrotational symmetric lens surfaces disposed sequentially from an object side and having, overall, a negative refractive power
Data Source
AI summary
A super wide angle optical system including: a first lens group including one or more of irrotational symmetric lens surfaces disposed sequentially from an object side and having, overall, a negative refractive power; an aperture stop for intercepting unnecessary light; and a second lens group including one or more of irrotational symmetric lens surfaces and having, overall, a positive refractive power.