Aspherical In-Vehicle Camera Optics for Wide View and Resolution
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Solution Overview
Problem
Existing in-vehicle camera optical systems fail to achieve a balance between the wide field of view and high resolution, as they either have insufficient aspherical effects for both fisheye and telephoto lens projection characteristics or unsuitable aspherical shapes.
Innovation Solution
An optical system with a first lens, a second lens, and a final lens, each having an aspherical surface with inflection points, configured to provide a projection characteristic compatible with both fisheye and telephoto lenses, offering a sufficient angle of view and resolution by varying imaging magnification between central and peripheral areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If aspherical lenses are used to achieve wide field of view, then angle of view is improved, but resolution deteriorates
Solution Approach 1:
The patent applies different aspherical surface designs to different regions of the optical system. The first and second lenses have aspherical surfaces optimized for wide-angle peripheral regions, while the final lens has an aspherical surface optimized for central high-resolution imaging. This regional differentiation allows the system to achieve both wide field of view and high resolution simultaneously.
Solution Approach 2:
The patent employs aspherical surfaces with inflection points in the first, second, and final lenses. These curved surfaces replace traditional spherical surfaces to correct aberrations and enable the dual projection characteristics. The aspherical shapes allow light rays from both peripheral and central regions to focus properly, achieving wide angle of view without sacrificing resolution.
2Area of stationary object
If aspherical effect is increased to achieve fisheye projection characteristic, then angle of view is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent applies aspherical surfaces selectively to only three critical lenses (first, second, and final lenses) rather than all lenses in the system. This partial application provides sufficient aspherical effect to achieve the desired fisheye projection characteristic while reducing the total manufacturing complexity and precision requirements compared to making all lenses aspherical.
3Measurement precision
If multiple aspherical lenses are used to achieve telephoto projection characteristic, then resolution is improved, but device complexity deteriorates
Solution Approach 1:
The patent concentrates aspherical surface design on three specific lenses that are most critical for achieving telephoto projection characteristic and high resolution. By optimizing these key components rather than uniformly complicating the entire optical system, the patent achieves high resolution while controlling overall device complexity.
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 optical system effectively realizes a projection characteristic that combines the benefits of fisheye and telephoto lenses, providing high resolution in central areas and sufficient angle and resolution in peripheral areas, while maintaining good optical performance across the entire field of view.
Implementation Method 1
Each of the first lens, the second lens, and the final lens has an aspherical surface. The aspherical surface of each of the first and second lenses has an inflection point. An imaging magnification is different between a first area of the optical system and a second area on a periphery side of the first area.
Data Source
AI summary
An optical system includes a first lens disposed closest to an enlargement conjugate position, a second lens adjacent to the first lens, a diaphragm disposed closer to a reduction conjugate position than the second lens, and a final lens disposed closest to a reduction conjugate position. Each of the first lens, the second lens, and the final lens has an aspherical surface. The aspherical surface of each of the first and second lenses has an inflection point. An imaging magnification is different between a first area of the optical system and a second area on a periphery side of the first area.