In-Vehicle Optical Lens Layout for Wide View and Central Magnification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-vehicle cameras face challenges in achieving a wide angle of view equivalent to fisheye lenses while maintaining a large imaging magnification in the central angle of view area, leading to larger image sensors and cameras.
Innovation Solution
An optical system comprising a front unit and a rear unit with specific lens configurations, including aspherical lenses, that satisfy the inequality 1 < f × sin(θmax)/y(θmax) ≤ 1.9, ensuring a high central resolution and wide angle of view, with a maximum half angle of view equivalent to fisheye lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a fisheye lens with projection characteristics (y=f×θ, y=2f×sin(θ/2), or y=f×sinθ) is used to achieve a wide angle of view, then the maximum angle of view is increased, but the imaging magnification in the central angle of view area becomes small
Solution Approach 1:
The patent applies local quality by implementing different projection characteristics in different angular regions. The optical system provides high imaging magnification (y=f×tanθ characteristic) in the central angle of view area while maintaining wide angle coverage (up to 180°) at the periphery. This is achieved through specific lens design that creates a local maximum in the differential value dy(θ)/dθ at the central region, ensuring high measurement precision where needed while preserving broad coverage.
2Area of moving object
If the image sensor size is increased to achieve a wider angle of view equivalent to fisheye lenses, then the angle of view is improved, but the camera size becomes larger
Solution Approach 1:
The patent applies parameter changes by modifying the projection characteristic parameters to satisfy the inequality 1 < f×sin(θmax)/y(θmax) ≤ 1.9. This parameter optimization enables the optical system to achieve a wide maximum half angle of view (θmax ≥ 90°) while maintaining high central imaging magnification, thereby reducing the required image sensor size and overall camera dimensions without sacrificing angle of view performance.
3Measurement precision
If an optical system with high central imaging magnification is designed, then the imaging magnification in the central area is improved, but the angle of view becomes narrower
Solution Approach 1:
The patent applies dynamics by creating a projection characteristic that dynamically adapts the imaging magnification across different angular regions. The system provides high magnification (local maximum of dy(θ)/dθ) at central angles for precise detection while progressively transitioning to wider angle coverage at peripheral regions. This dynamic characteristic distribution allows the optical system to simultaneously achieve both high central imaging magnification and wide overall angle of view.
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 provides a high central resolution, wide angle of view, and good optical performance, reducing optical distortion and improving detection accuracy of vehicles, while maintaining a compact camera size.
Implementation Method 1
an optical system includes, in order from an enlargement conjugate side to a reduction conjugate side, a front unit including a plurality of lenses, an aperture stop, and a rear unit including a plurality of lenses
Data Source
AI summary
An optical system includes, in order from an enlargement conjugate side to a reduction conjugate side, a front unit including a plurality of lenses, an aperture stop, and a rear unit including a plurality of lenses. A projection characteristic of the optical system representing a relationship between a half angle of view and an image height on an image plane satisfies a predetermined condition.