Vehicle Optical System with Concave Lens Curvature Ratio
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Solution Overview
Problem
Conventional vehicle head lamps with low efficiency optical systems can only receive a range of 30° or less of light, limiting their ability to effectively utilize high-resolution pixelized light-emitting units for improved illumination, especially in low-light conditions.
Innovation Solution
A vehicle optical system comprising a first lens and a second lens with a concave incidence surface, where the curvature ratio between the lenses is between 1.2 to 3.0, allowing the system to receive light in a range of 60° or more, enhancing light intensity and efficiency by reducing Fresnel Loss and chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional imagery lens optical system is used, then the system structure is simple, but the light receiving range is limited to 30° or less and efficiency is low
Solution Approach 1:
The optical system is divided into multiple lens units (first lens unit, second lens unit, third lens unit) with specific curvature ratio relationships. Each lens unit has defined curvature radii (R1, R2, R3, R4) that work together to expand the light receiving angle to 60° or more while maintaining system manageability through modular segmentation
Solution Approach 2:
The patent applies specific parameter relationships to achieve the desired performance: curvature ratio between first and second lenses is 1.2-3.0, curvature ratio between second and third lenses is 0.5-2.0, and the ratio of curvature radius R2 to R4 is 0.3-2.0. These parameter optimizations enable both expanded light receiving range and maintained manufacturing feasibility
2Productivity
If the light receiving angle is expanded to 60° or more, then light intensity and efficiency improve, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges that balance performance and manufacturability: curvature ratios of 1.2-3.0 and 0.5-2.0, and radius ratio of 0.3-2.0. These ranges are optimized to achieve 60°+ light receiving angle while keeping manufacturing precision requirements at practical levels
Solution Approach 2:
The patent applies curvature ratios at the optimal range (1.2-3.0) that provide sufficient light receiving efficiency without requiring extreme precision. This partial optimization approach achieves the necessary 60° light receiving angle without demanding ultra-precise manufacturing tolerances
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 system achieves a high light intensity of 40,500 cd or more, maintaining efficiency and resolution over a wider light pattern, satisfying Adaptive Driving Beam and high beam regulations, with a view angle of 4.8° to 11.2° and effective focal distance of 28 mm to 70 mm, significantly improving light distribution and safety.
Implementation Method 1
a first lens disposed proximate to the light-emitting unit and a second lens disposed farther from the light-emitting unit than the first lens and having a concave incidence surface
Data Source
AI summary
An optical system is provided. The optical system includes a first lens and a second lens disposed in front of the first lens. In particular, the second lens has a concave incidence surface, a curvature ratio between the first lens and the second lens is in a range of about 1.2 to 3.0, and the optical system receives a light emitted by a light-emitting unit in a range of about 60° or more.