Four-Lens Optical Imaging System for Miniaturized Infrared Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current miniaturized optical imaging systems for portable electronic products suffer from poor imaging effects due to insufficient light input, particularly in infrared applications, due to their large aperture number (Fno) and limited light gathering capability.
Innovation Solution
An optical imaging system comprising four lenses with specific refractive powers and surface configurations, including negative, positive, and aspheric surfaces, optimized to reduce the relative F number (Fno) and increase light illumination, allowing for effective imaging in the infrared wavelength band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical imaging system is miniaturized, then the device size is reduced, but the aperture number increases leading to poor imaging effects
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices, curvatures, and thicknesses of the four lens elements. Specifically, the first lens has negative refractive power with specific curvature relationships (0.5 < |R1/R2| < 2.0), and the fourth lens has positive refractive power with specific curvature relationships (0.3 < |R7/R8| < 1.5). These parameter optimizations enable the system to achieve a reduced F-number (Fno < 2.5) while maintaining miniaturization, thereby improving light gathering capability without increasing system size.
2Device complexity
If the aperture number is large, then the system can be compact, but light gathering capability is insufficient
Solution Approach 1:
The patent optimizes optical parameters including the F-number (Fno < 2.5), field of view (60° < FOV < 100°), and various lens curvature ratios. The specific parameter ranges for lens thicknesses (0.3 < CT1/TTL < 0.8, 0.5 < CT4/TTL < 0.9) and spacing (0.1 < T12/TTL < 0.4) are designed to maximize light transmission while maintaining compact dimensions. These parameter changes enable the system to achieve both compactness and sufficient light gathering capability.
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 improved image quality, high relative illumination, and miniaturization, enabling efficient infrared imaging and detection applications while maintaining a compact form factor.
Implementation Method 1
The first lens has negative refractive power, the second lens has refractive power, the third lens has refractive power, and the fourth lens has positive refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging system including, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens and a fourth lens. The first lens has negative refractive power, an object-side surface thereof is a convex surface, and an image-side surface thereof is a concave surface; the second lens has refractive power; the third lens has refractive power; and the fourth lens has positive refractive power, an object-side surface thereof is a convex surface, and an image-side surface thereof is a concave surface. A wavelength λ of a chief ray of the optical imaging system and a tangent tan θ of a half field-of-view of the optical imaging system satisfy 0.5 μm<λ*tan θ<1.0 μm.