Five-Lens Optical System for High NA LED Resolution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle lighting systems using LEDs face challenges in maintaining resolution while reducing the number of lenses and increasing numerical aperture (NA) to minimize manufacturing costs and enhance light transmission.
Innovation Solution
A five-lens optical system is designed with specific refractive power arrangements and materials, including a plastic first lens and a glass fifth lens, to achieve high resolving power and low material costs, with conditions such as 0.7 < |f2/f| < 1 and 0.4 ≤ |f2/f345| ≤ 2, ensuring efficient light transmission and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of lenses is reduced to lower manufacturing cost, then manufacturing cost is reduced, but resolution of the beam pattern deteriorates
Solution Approach 1:
The optical system is divided into five distinct lens elements with specific refractive powers arranged in sequence. Each lens contributes to correcting specific aberrations, allowing the system to achieve high resolution with a reduced total number of lenses compared to traditional multi-element designs.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens including focal lengths (f1, f2, f3, f4, f5), refractive powers, and spacing distances (d1, d2, d3, d4) to optimize the balance between manufacturing cost and resolution. The numerical aperture is maintained at 0.5 or more while controlling the ratio parameters to achieve both cost-effectiveness and high resolving power.
2Productivity
If the numerical aperture is increased to enhance light transmission, then light transmission efficiency is improved, but aberration correction becomes more difficult
Solution Approach 1:
Different lens elements are assigned specific refractive powers and material properties to address local aberration issues. The first lens has positive refractive power for initial light convergence, the second lens has negative refractive power for aberration correction, and subsequent lenses are configured to progressively refine the beam pattern while maintaining high NA.
Solution Approach 2:
The patent employs lenses with different refractive indices and Abbe numbers to correct chromatic and spherical aberrations simultaneously. By combining materials with different optical properties in the five-lens configuration, the system achieves superior aberration correction while maintaining high light transmission efficiency through the large numerical aperture.
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 maximum resolving power with a high NA of 0.6 or more, maintaining a half-view angle of 10° to 20° and reducing material costs by using a small number of lenses, while effectively correcting chromatic and spherical aberrations.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, and a fifth lens that are sequentially arranged from an object side to an image side
Implementation Method 2
the first lens may have positive refractive power, the second lens may have negative refractive power
Data Source
AI summary
The present invention relates to a lens optical system including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens that are sequentially arranged from an object side to an image side, in which the first lens has positive refractive power and the second lens has negative refractive power.