Wide-Angle Optical System for Vehicle Panoramic Imaging
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Solution Overview
Problem
Conventional vehicle backup camera systems only address rear blind spots, leaving side and front blind spots unaccounted for, leading to potential safety hazards, especially in congested urban areas.
Innovation Solution
An optical system comprising a sequence of lenses with specific refractive powers and surface curvatures, including a first lens with a negative refractive power and a concave image side surface, a second lens with a negative refractive power and a concave image side surface, and subsequent lenses with positive and negative refractive powers, designed to provide a wide-angle view and reduce ghosting issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide-angle lens with a straw hat structure and highly curved image side surface is used to expand field of vision, then the field of view is increased, but the degree of curvature difference between center and edges becomes too large causing uneven coating, ghosts, and reduced imaging quality
Solution Approach 1:
The patent applies parameter changes by optimizing the curvature radius of the image side surface of the first lens to be within a specific range (0.05mm to 0.15mm) and controlling the semi-aperture to radius ratio. This parameter optimization resolves the contradiction by enabling wide-angle viewing while maintaining coating uniformity and reducing ghosting effects.
2Area of stationary object
If multiple camera modules are arranged on the vehicle to achieve 360° panoramic coverage, then the coverage area is increased, but the device complexity and cost increase
Solution Approach 1:
The patent applies universality by designing a single wide-angle camera module that can serve multiple functions: capturing front, rear, and side views simultaneously. The optimized optical system enables one camera to replace multiple cameras, achieving 360° panoramic coverage while reducing device complexity and cost.
3Area of stationary object
If a highly curved lens surface is used to achieve wide-angle characteristics, then the field of view is expanded, but imaging quality deteriorates due to ghosting and uneven coating
Solution Approach 1:
The patent applies parameter changes by precisely controlling the curvature radius of the image side surface within 0.05mm to 0.15mm and optimizing the semi-aperture to radius ratio. These parameter optimizations enable the lens to achieve wide-angle characteristics while maintaining imaging quality and reducing ghosting effects.
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 effectively expands the driver's field of vision, providing 360° panoramic scene acquisition by reducing the number of camera modules required, while minimizing ghosting and improving imaging quality.
Implementation Method 1
a first lens having a negative refractive power, an object side surface of the first lens being convex, and an image side surface of the first lens being concave; a second lens having a negative refractive power, an image side surface of the second lens being concave; a third lens having a positive refractive power; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power
Data Source
AI summary
An optical system, sequentially comprising from an object side to an image side: a first lens having a negative refractive power, an object-side surface of the first lens being a convex surface, and an image-side surface thereof being a concave surface; a second lens having a negative refractive power, an image-side surface of the second lens being a concave surface; a third lens having a positive refractive power; a diaphragm; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power. The optical system satisfies the following relationship: (SD S2)/(RDY S2)<0.93, wherein SD S2 is the Y-direction half aperture of the image-side surface of the first lens, and RDY S2 is the Y radius of the image-side surface of the first lens.