Aspherical Lens Optical System for Compact Wide-Angle Imaging
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Solution Overview
Problem
Existing lens optical systems for cameras, particularly in vehicles and action cams, face challenges in achieving a compact configuration with a wide angle of view due to the limitations of spherical glass lenses, which result in increased cost and complexity, making it difficult to implement a miniature optical system with high reliability.
Innovation Solution
A lens optical system comprising a sequence of aspherical glass lenses with specific refractive powers and surface configurations, including a cemented lens with positive refractive power, that satisfies conditions for a wide angle of view and short total length, ensuring high reliability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spherical glass lenses are used to construct an optical system, then high reliability is achieved, but the number of lenses increases and the cost increases
Solution Approach 1:
The patent employs aspherical lenses instead of spherical lenses. The aspherical surfaces are defined by specific mathematical equations with multiple coefficients (A4, A6, A8, A10) that control the curvature variation across the lens surface. This allows a single lens to perform the optical function that would otherwise require multiple spherical lenses, reducing the total lens count while maintaining high reliability through the use of glass materials.
2Reliability
If spherical glass lenses are used to construct an optical system, then high reliability is achieved, but the cost increases
Solution Approach 1:
The aspherical lens design with precisely controlled surface curvature (defined by equations with coefficients A4, A6, A8, A10) enables correction of optical aberrations in a single element, reducing the need for multiple expensive spherical lenses. The specific curvature profiles are optimized to achieve wide-angle performance and compact form factor, lowering overall system cost while maintaining reliability through glass construction.
3Reliability
If a large number of lenses are used, then optical performance is maintained, but it becomes difficult to achieve a compact optical system configuration
Solution Approach 1:
The aspherical surfaces with specifically designed curvature profiles (using coefficients A4, A6, A8, A10 in the surface equation) enable strong optical power in compact lens elements. This allows the optical system to achieve wide-angle performance and maintain image quality with fewer elements, directly reducing the total length from the first lens to the image sensor while preserving optical performance.
Solution Approach 2:
The patent utilizes specific refractive index ranges (1.5 < Nd1 < 2.0, 1.5 < Nd2 < 2.0, Nd3 > 1.7, Nd4 > 1.7) and Abbe number combinations (40 < Abv1 < 70, 20 < Abv2 < 50, Abv3 > 50, 20 < Abv4 < 50) to optimize the optical performance per unit length. By carefully selecting material parameters, the system achieves high performance in a compact configuration, reducing total length while maintaining image quality.
4Adaptability or versatility
If a lens optical system with a wide angle of view is used, then wide range monitoring/photographing functions are achieved, but it becomes difficult to implement a miniature optical system with short total length
Solution Approach 1:
The aspherical lens surfaces with specifically controlled curvature (defined by equations with coefficients A4, A6, A8, A10) enable the system to achieve wide angle of view (FOV ≥ 100°) while maintaining a compact total length (TTL < 8mm). The aspherical profiles allow for stronger optical power and better aberration control in compact elements, making wide-angle miniaturization feasible.
Solution Approach 2:
The patent specifies refractive index ranges (1.5 < Nd1 < 2.0, 1.5 < Nd2 < 2.0, Nd3 > 1.7, Nd4 > 1.7) and Abbe number ranges (40 < Abv1 < 70, 20 < Abv2 < 50, Abv3 > 50, 20 < Abv4 < 50) to optimize the balance between wide angle of view and compact size. By carefully selecting material parameters, the system achieves FOV ≥ 100° while keeping TTL < 8mm, resolving the contradiction between wide-angle performance and miniaturization.
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 proposed lens optical system achieves a compact design with a wide angle of view while maintaining high reliability and performance, effectively correcting various aberrations and ensuring excellent image quality.
Implementation Method 1
the first lens has a negative (−) refractive power and has an exit surface that is concave with respect to the image sensor, the second lens has a positive (+) refractive power and has an incidence surface that is convex toward the object, the third lens has a positive (+) refractive power and has an exit surface that is convex toward the image sensor, the fourth lens has a positive (+) refractive power and has an exit surface that is convex toward the image sensor, and the fifth lens has a negative (−) refractive power
Data Source
AI summary
Provided is a photographing lens optical system. The lens optical system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from an object to an image sensor. The first lens may have a negative (−) refractive power and have an exit surface that is concave with respect to the image sensor. The lens optical system may satisfy at least one of a condition 100°<FOV<200° and a condition 1<TTL/ImgH<2. Herein, FOV denotes an angle of view of the lens optical system, TTL denotes a distance from an incidence surface of the first lens to the image sensor, and ImgH denotes a diagonal length of a maximum pixel region of the image sensor.