Multi-element Imaging Lens for Wide-Angle Vehicle Detection
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Solution Overview
Problem
Current imaging lenses for vehicle-mounted cameras struggle to achieve a wide image viewing angle while maintaining high resolution for long-distance objects, often requiring additional sensing devices like millimeter wave radar for accurate detection.
Innovation Solution
An imaging lens configuration consisting of at least six lenses, including a first negative refractive power lens and a second positive refractive power lens, with specific curvature radii and focal lengths to achieve a wide angle and high resolution, allowing for a compact design that can detect long-distance objects effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional imaging lens configuration is used, then the structure is simple, but the image viewing angle is narrow and long-distance object detection is insufficient
Solution Approach 1:
The imaging lens is divided into multiple lens units with alternating positive and negative refractive powers. Specifically, it includes a first lens unit with negative refractive power, a second lens unit with positive refractive power, and subsequent units, where each unit contributes differently to the overall optical function. This segmentation allows the system to achieve a wide image viewing angle while maintaining the ability to focus on long-distance objects, resolving the contradiction between viewing angle and detection capability.
Solution Approach 2:
Different lens units are assigned specific optical functions: the first lens unit with negative refractive power expands the field of view, while the second lens unit with positive refractive power provides focusing power for distant objects. By giving different parts of the optical system different local qualities (refractive powers and functions), the system simultaneously achieves wide-angle capability and long-distance detection without requiring additional sensing devices.
2Measurement precision
If additional sensing devices like millimeter wave radar are added, then long-distance object detection is improved, but the device complexity and size increase
Solution Approach 1:
The imaging lens is designed to perform multiple functions within a single optical system. By incorporating lens units with specific refractive powers and arranging them in a particular configuration, the system can simultaneously achieve wide-angle imaging and accurate long-distance object detection. This multi-functionality eliminates the need for separate millimeter wave radar devices, reducing overall system complexity while maintaining detection precision.
3Volume of moving object
If the lens outer diameter is reduced, then the device size is compact, but the brightness and light gathering capability are insufficient
Solution Approach 1:
The patent optimizes specific optical parameters, particularly the curvature radius of the object-side surface of the first lens unit. By controlling this parameter within a specific range relative to the focal length, the system achieves an optimal balance between compact size and light-gathering capability. This parameter optimization allows the lens to maintain small dimensions while ensuring sufficient brightness for effective imaging.
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 proposed lens configuration enables a vehicle-mounted imaging apparatus to capture high-resolution images of long-distance objects with a wide viewing angle, reducing the need for additional sensing devices and maintaining a compact form factor.
Implementation Method 1
an imaging lens consisting of n (n is a natural number equal to or larger than six) lenses including a first lens having negative refractive power and a second lens having positive refractive power
Data Source
AI summary
An imaging lens and an imaging apparatus capable of acquiring a long-distance object image at high resolution and capable of acquiring a short-distance object image in a wide range while, as a whole, being configured small. In order to achieve the object, an imaging lens according to the present invention is an imaging lens consisting of n (n is a natural number equal to or larger than six) lenses including a first lens having negative refractive power and a second lens having positive refractive power in order from an object side and including an n-th lens having negative refractive power and an n−1-th lens having positive refractive power in order from an image side, the imaging lens satisfying a predetermined conditional expression.