Aspheric Vehicle Camera Optics for Wide-Angle Distant Imaging
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Solution Overview
Problem
Conventional in-vehicle cameras for front monitoring require multiple cameras and struggle to extend focal length in the central area while maintaining high-resolution imaging of distant objects.
Innovation Solution
An optical system comprising a front unit with a first aspheric lens and a rear unit, both having positive refractive power, with specific focal length ratios and aspheric surfaces, allowing for a wide angle of view and long focal length in the central area, reducing curvature of field and chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a conventional wide-angle optical system is used, then a wide angle of view is achieved, but the focal length in the central area is short and imaging resolution of distant objects is insufficient
Solution Approach 1:
The patent implements different focal lengths in different regions of the optical system. The front unit has positive refractive power to provide a wide angle of view, while the rear unit has negative refractive power to extend the focal length in the central area. This local differentiation allows the central region to have telephoto characteristics for high-resolution distant imaging while the periphery maintains wide-angle coverage.
Solution Approach 2:
The optical system is divided into two distinct units: a front unit with positive refractive power and a rear unit with negative refractive power. This segmentation allows each unit to be optimized for its specific function - the front unit for wide-angle light gathering and the rear unit for extending central focal length - thereby resolving the contradiction between wide angle of view and high-resolution distant imaging.
2Adaptability or versatility
If multiple cameras are used to achieve both wide-angle and telephoto monitoring, then imaging coverage is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple cameras into a single optical system. By combining a front unit with positive refractive power (providing wide-angle capability) and a rear unit with negative refractive power (providing telephoto capability), the system achieves both wide-angle and telephoto monitoring functions in one integrated camera, thereby reducing device complexity while maintaining versatile imaging coverage.
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 achieves high-resolution imaging with a wide angle of view and extended focal length in the central area, enabling efficient imaging of distant objects while maintaining a compact design.
Implementation Method 1
The first aspheric lens includes an aspheric surface having an inflection point in a section including an optical axis
Implementation Method 2
reducing curvature of field and chromatic aberration
Data Source
AI summary
An optical system includes, in order from an object side to an image side, a front unit having positive refractive power, an aperture stop, and a rear unit having positive refractive power. The front unit includes, in order from the object side to the image side, a first aspheric lens, a first negative lens, and a first positive lens. The rear unit includes, in order from the image side to the object side, a second aspheric lens, a second negative lens, and a second positive lens. The first aspheric lens includes an aspheric surface having an inflection point in a section including an optical axis. A predetermined condition is satisfied.