Seven-Lens Optical Assembly for Compact Wide-Angle Vehicle Cameras
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Solution Overview
Problem
Front cameras in vehicles have large numbers of lenses and excessive optical length, hindering miniaturization and affecting the performance of driving assistance functions.
Innovation Solution
An optical lens assembly comprising seven lenses with specific focal powers and configurations, including a first lens with negative power and a seventh lens with positive power, optimized for wide field of view, large aperture, and miniaturization, with focal length and radius of curvature relationships that enhance imaging quality and reduce aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of lenses are used to achieve wide field of view and high resolution, then imaging quality is improved, but total optical length increases and device size enlarges
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal lengths, refractive indices, and curvature radii of each lens. Specific relationships are defined between these parameters (e.g., focal length ratios, curvature relationships) to optimize the optical system. This allows achieving wide field of view and high imaging quality while maintaining a compact total optical length through mathematical optimization of optical parameters.
Solution Approach 2:
The optical system is segmented into seven distinct lenses with specific functions assigned to each. The lenses are arranged in a specific sequence with defined focal power distributions (negative, positive, and mixed). This segmentation allows each lens to contribute specifically to correcting aberrations or expanding field of view, thereby achieving high imaging quality without requiring excessive total optical length.
2Measurement precision
If more lenses are added to enhance resolution and field of view, then optical performance is improved, but device complexity increases
Solution Approach 1:
The patent defines specific parameter relationships and constraints for each lens (focal length ratios, refractive index ranges, curvature relationships) to optimize performance. By precisely controlling these parameters, the system achieves high resolution with a moderate number of lenses rather than requiring many lenses with loose parameter constraints, thus reducing overall device complexity.
Solution Approach 2:
Each lens in the seven-lens system is designed to serve multiple functions simultaneously. For example, lenses are configured to correct various aberrations (spherical, coma, astigmatism) while also contributing to field of view expansion and focal length control. This multi-functionality reduces the need for additional specialized lenses, thereby improving resolution without proportionally increasing device complexity.
3Length of stationary object
If optical length is reduced for miniaturization, then device size decreases, but imaging quality and field of view may deteriorate
Solution Approach 1:
The patent employs extensive parameter optimization with specific mathematical relationships defined between focal lengths, refractive indices, and curvature radii. These parameter constraints are designed to maintain imaging quality even with reduced optical length. The optimized parameter combinations allow the system to achieve compact size while preserving high resolution and wide field of view through precise control of light paths and focal properties.
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 lens assembly achieves a wide field of view, large aperture, and miniaturization, improving imaging quality and adaptability to image sensors, while reducing aberrations and enabling effective scene information acquisition.
Implementation Method 1
An optical lens assembly, comprising seven lenses, wherein the seven lenses arranged in sequence from an object side to an imaging surface along an optical axis
Data Source
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AI summary
Provided is an optical lens assembly. The optical lens assembly includes a total of seven lenses, where the seven lenses arranged in sequence from an object side to an imaging surface along an optical axis are as follows: a first lens with a negative focal power, where an image-side surface of the first lens is concave; a second lens with a focal power, where an object-side surface of the second-lens is convex, and an image-side surface of the second lens is concave; a third lens with a focal power; a fourth lens with a positive focal power, where an object-side surface and an image-side surface of the fourth lens are both convex; a fifth lens with a focal power; a sixth lens with focal power; and a seventh lens with a positive focal power. An effective focal length f of the optical lens assembly and a focal length f2 of the second lens satisfy: 14.0 < |f2/f.