In-Vehicle Camera Optics Balancing Wide Angle and Resolution
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Solution Overview
Problem
Existing in-vehicle camera optical systems fail to achieve a balance between a wide angle of view and high resolution, with previous designs either having a small angle of view or suboptimal lens configurations that hinder the realization of both fisheye and telephoto lens projection characteristics.
Innovation Solution
An optical system comprising a front unit with three or more lenses, including a positive and negative lens configuration, and a rear unit, which satisfies specific inequalities for projection and resolution characteristics, ensuring a sufficient angle of view and high resolution across the entire field of view, effectively combining the benefits of fisheye and telephoto lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a fisheye lens is used to achieve a wide angle of view, then the angle of view is improved, but the resolution deteriorates
Solution Approach 1:
The optical system is divided into a front unit with three or more lenses and a rear unit with one or more lenses. The front unit is specifically designed to capture a wide angle of view, while the rear unit is optimized to maintain high resolution, thereby resolving the contradiction between wide angle and resolution through functional segmentation of the optical path.
Solution Approach 2:
Different regions of the optical system are assigned different optical characteristics. The front unit uses specific lens configurations (with focal lengths satisfying 0.10 < f2/f1 < 1.50) to optimize wide-angle performance, while the rear unit is designed for resolution optimization, creating local quality variations that simultaneously achieve both wide angle of view and high resolution.
2Measurement precision
If a telephoto lens is used to achieve high resolution, then the resolution is improved, but the angle of view deteriorates
Solution Approach 1:
The optical system segments the imaging function between front and rear units. The front unit with multiple lenses (satisfying 0.10 < f2/f1 < 1.50) handles wide-angle capture, while the rear unit handles resolution-critical imaging, allowing the system to achieve both telephoto-like resolution and fisheye-like wide angle simultaneously.
Solution Approach 2:
The optical system achieves multi-functionality by combining fisheye and telephoto characteristics in a single system. The front unit provides wide-angle coverage while the rear unit maintains high resolution, making the system universally applicable for both wide-area monitoring and detailed imaging without requiring separate lenses.
3Device complexity
If the front unit includes only two lenses, then the device complexity is reduced, but the projection characteristic deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for the lens system, particularly the focal length ratio 0.10 < f2/f1 < 1.50 and the inequality 1.80 ≤ f sin θmax/y(θmax) ≤ 4.50. By optimizing these parameters within the three-or-more-lens front unit configuration, the system achieves superior projection characteristics that cannot be obtained with simpler two-lens designs.
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 balanced performance with a wide angle of view and high resolution, correcting distortion and curvature of field issues, thus enhancing the overall optical performance and image quality.
Implementation Method 1
An optical system according to one aspect of the present invention includes, in order from an enlargement conjugate side to a reduction conjugate side, a front unit including three or more lenses, a diaphragm, 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 three or more lenses, a diaphragm, and a rear unit including a plurality of lenses. The front unit includes a first positive lens closest to an enlargement conjugate position, and a second positive lens. A predetermined condition is satisfied.