Six-Lens Optical Layout for Wide-Angle High-Resolution Imaging
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Solution Overview
Problem
Conventional automotive lenses for automatic driving assistance systems either have a long focal length with a small field of view or a short focal length with a large field of view, lacking a combination of large aperture, field of view, and high resolution.
Innovation Solution
An optical lens design that integrates multiple lenses with specific refractive powers and shapes, including a first lens with negative power, a second lens with positive power, a stop, and subsequent lenses with positive and negative powers, forming a cemented lens to achieve a large aperture, field of view, and high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a lens is designed to be compact and lightweight, then it is suitable for mobile devices, but chromatic aberration and spherical aberration increase
Solution Approach 1:
The patent employs a composite lens structure combining resin material with molded aspheric surfaces. This composite approach allows achieving compact size and lightweight properties while maintaining optical performance through precise surface geometry control rather than relying solely on material properties
Solution Approach 2:
The patent utilizes aspheric surfaces on the lens elements, deviating from traditional spherical shapes. This curvature modification enables correction of spherical aberration while maintaining compact form factor, and the specific aspheric profiles help reduce chromatic aberration through optimized light path control
2Illumination intensity
If the lens has a small F-number for bright imaging, then light gathering capability improves, but spherical aberration increases
Solution Approach 1:
The patent employs aspheric surfaces with specifically designed curvature profiles that enable small F-number operation while correcting spherical aberration. The aspheric geometry allows steeper surface angles to be optimized, improving light gathering capability without the typical spherical aberration penalties
Solution Approach 2:
The patent applies different aspheric profile characteristics to different zones of the lens surfaces. By optimizing local surface properties across the aperture, the lens achieves uniform aberration correction across the entire field while maintaining small F-number for bright imaging
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 design enables a large aperture, large field of view, and high resolution, effectively correcting aberrations and ensuring good imaging quality across various field angles and wavelengths.
Implementation Method 1
Optical lens... comprising, in sequence from an object side to a sensor side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5
Data Source
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AI summary
An optical lens, which in total has six lenses, and which, along an optical axis from an object side to an image plane, sequentially comprises: a first lens (L1) having a negative optical power, the object side surface (S1) being convex, and the image side surface (S2) being concave; a second lens (L2) having a positive optical power, the object side surface (S3) being concave, and the image side surface (S4) being convex; a stop (ST); a third lens (L3) having a positive optical power, the object side surface (S5) and the image side surface (S6) both being convex; a fourth lens (L4) having a positive optical power, the object side surface (S7) and the image side surface (S8) both being convex; a fifth lens (L5) having a negative optical power, the object side surface (S9) and the image side surface (S10) both being concave; and a sixth lens (L6) having a positive optical power, the object side surface (S11) being convex, and the image side surface (S12) being concave; the fourth lens (L4) and the fifth lens (L5) are adhered together to form a cemented lens; and the real image height IH corresponding to the maximal field of view and the effective focal length f of the optical lens satisfy: 0.6<f/IH<0.7.