Aspheric Vehicle Camera Optics for Long-Center and Wide-Angle Imaging
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Solution Overview
Problem
Conventional in-vehicle cameras face challenges in extending focal length in the central area and achieving high-resolution imaging for distant objects while maintaining a wide angle of view.
Innovation Solution
An optical system design comprising a front unit with positive refractive power and a rear unit with positive refractive power, including aspheric lenses with inflection points, and specific focal length ratios to achieve a long focal length and wide angle of view, with resin lenses for temperature correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional in-vehicle camera system uses multiple cameras (telephoto for distant monitoring and wide-angle for front oblique monitoring), then distant object monitoring and pedestrian detection capabilities are improved, but device complexity and system cost increase
Solution Approach 1:
The patent combines the functions of multiple cameras (telephoto and wide-angle) into a single camera by implementing a focal length distribution optical system that provides different focal lengths in different field-of-view regions. This merging approach eliminates the need for multiple separate camera units while maintaining both distant object monitoring and pedestrian detection capabilities.
Solution Approach 2:
The optical system implements local quality by providing different focal length characteristics in different regions of the field of view. The central region has a longer focal length for distant object monitoring, while the peripheral regions have shorter focal lengths for wide-angle pedestrian detection. This spatial variation in optical properties allows a single camera to perform multiple monitoring functions.
2Measurement precision
If the focal length in the central area is extended for high-resolution distant imaging, then distant object detection precision is improved, but the angle of view decreases
Solution Approach 1:
The patent applies local quality by creating a focal length distribution where the central region of the optical system has a longer focal length for high-resolution distant imaging, while the peripheral regions have shorter focal lengths that provide a wider angle of view. This spatial differentiation allows the system to achieve both high-resolution distant object detection and wide-angle pedestrian monitoring simultaneously within a single optical path.
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 high-resolution imaging with a long focal length in the central area and a wide angle of view, enabling efficient object detection and collision avoidance in vehicles.
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
with resin lenses for temperature correction
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.