Seven-Lens Wide-Angle Optical System for Compact In-Vehicle Cameras
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Solution Overview
Problem
Wide-angle lenses for in-vehicle cameras face challenges in maintaining optical performance while keeping the overall length of the lens system from becoming excessively large, particularly due to limited space for mounting, which complicates the correction of various aberrations and brightness considerations.
Innovation Solution
The configuration of a wide-angle lens system comprising specific lenses with aspherical surfaces and a cemented lens design, where the object-to-image distance and entrance pupil diameter satisfy certain conditions, ensuring optimal optical performance without excessive length, including the use of a diaphragm and imaging elements to manage aberrations and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses is increased to correct aberrations, then optical performance is improved, but the overall length of the lens system becomes excessively large
Solution Approach 1:
The patent employs a nested lens structure where multiple lens elements are arranged in a compact sequence. The seventh lens is positioned closest to the image sensor, with the sixth lens having a negative focal length that helps fold the optical path. This nesting approach allows seven lenses to be arranged in a space-efficient manner, correcting various aberrations while maintaining a compact overall length suitable for in-vehicle camera applications.
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lens elements (first, second, fourth, fifth, sixth, and seventh lenses) to change the geometric parameters of the lens surfaces. This allows for better aberration correction with fewer elements and reduced overall length. The aspherical design enables more efficient light path control compared to traditional spherical lenses, resolving the contradiction between optical performance and compact size.
2Adaptability or versatility
If the focal length is reduced to achieve wide-angle effect, then field of view is improved, but brightness and aberration correction become difficult
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements to optimize the curvature of light paths. The aspherical design allows the lens to maintain a wide field of view while controlling spherical aberration and maintaining brightness uniformity across the image plane. This curvature optimization enables the wide-angle effect without sacrificing illumination intensity or aberration correction.
Solution Approach 2:
The patent uses a composite lens system combining multiple lens materials with different refractive indices and dispersion properties. This composite approach allows the system to achieve wide-angle performance while correcting chromatic aberrations and maintaining brightness. The combination of different optical materials compensates for the limitations of individual lenses in wide-angle configurations.
3Adaptability or versatility
If the focal length is reduced to achieve wide-angle effect, then field of view is improved, but distortion and curvature of field become difficult to correct
Solution Approach 1:
The patent divides the optical system into seven distinct lens segments, each with specific optical properties and positions. This segmentation allows independent optimization of each lens element to correct specific types of aberrations. The divided structure enables precise control over distortion and curvature of field while maintaining a wide field of view, as each segment can be tailored to address particular optical challenges.
Solution Approach 2:
The patent designs the lens system where multiple lens elements serve multiple functions simultaneously. For example, the sixth lens with negative focal length contributes to both wide-angle performance and distortion correction, while aspherical surfaces on various elements address both field curvature and astigmatism. This multi-functionality allows effective aberration correction across the wide field of view without requiring additional dedicated correction elements.
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
This configuration effectively corrects various aberrations and ensures good optical characteristics while preventing the lens system from becoming excessively large, enabling high-density imaging applications.
Implementation Method 1
a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power and a seventh lens L7 with positive refractive power
Data Source
AI summary
Provided is a wide-angle lens, including a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, and a seventh lens, sequentially arranged from an object side. An object-to-image distance of the wide-angle lens is set to d, an entrance pupil diameter of the wide-angle lens is set to HEP, and d/HEP<29.000 is satisfied.