Four-Lens Optical Imaging Assembly for Depth Perception
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Solution Overview
Problem
Current optical imaging lens assemblies for depth perception applications suffer from significant aberrations and low resolution, which affect the accuracy of depth perception in 3D depth cameras.
Innovation Solution
An optical imaging lens assembly comprising four lenses with specific refractive powers and surface types, including a first lens with positive refractive power and a convex object-side surface, a second lens with positive or negative refractive power and a concave object-side surface, a third lens with positive refractive power and a concave object-side surface, and a fourth lens with positive or negative refractive power and a convex object-side surface, along with an infrared bandpass optical filter, is designed to minimize aberrations and enhance resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical imaging lens assemblies are used, then the structure is simple, but the resolution is low and aberrations are significant
Solution Approach 1:
The optical imaging lens assembly is divided into four separate lens elements (first lens E1, second lens E2, third lens E3, fourth lens E4), each with specific refractive power and surface curvature characteristics. This segmentation allows independent optimization of each lens to reduce aberrations while achieving high resolution imaging.
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first lens has positive refractive power with a convex object-side surface, the second lens has negative refractive power, the third lens has positive refractive power, and the fourth lens has positive refractive power. This local differentiation of optical properties enables precise control of light paths to minimize aberrations.
2Manufacturing precision
If more lenses are added to improve resolution, then the imaging quality improves, but the device size increases
Solution Approach 1:
The lens assembly employs aspheric surfaces with dynamically optimized curvature radii and thickness parameters. The conditional expressions (0.5 < f1/f < 1.5, 0.3 < CT1/ f1 < 0.7, 0.1 < T12/ f < 0.3) enable flexible adjustment of optical paths to achieve high imaging quality while controlling the overall device volume.
Solution Approach 2:
The patent utilizes aspheric surface geometry instead of traditional spherical surfaces, adding dimensional complexity to the lens surfaces. This allows correction of off-axis aberrations and improves imaging quality without proportionally increasing the axial length of the lens assembly.
3Manufacturing precision
If lens parameters are optimized for high resolution, then the imaging performance improves, but the manufacturing difficulty increases
Solution Approach 1:
The patent defines specific parameter ranges for each lens element (refractive power, curvature radius, thickness) through conditional expressions. These parameter specifications balance optical performance requirements with manufacturing feasibility, allowing precision molding while achieving high imaging performance.
Solution Approach 2:
The lens assembly uses optical materials with specific refractive indices and Abbe numbers selected to complement each other. This material selection strategy achieves chromatic aberration correction and high resolution while using materials that are manufacturable with current precision molding techniques.
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 lens assembly achieves miniaturization, small aberrations, and high resolution, effectively meeting the requirements for imaging receiving lenses in depth perception applications by optimizing refractive powers, surface types, and spacing distances between lenses.
Implementation Method 1
a first lens having a positive refractive power, and an object-side surface of the first lens being a convex surface
Implementation Method 2
the second lens has a positive refractive power or a negative refractive power, an object-side surface of the second lens being a concave surface, and an image-side surface of the second lens being a convex surface
Implementation Method 3
the third lens has a positive refractive power, an object-side surface of the third lens being a concave surface, and an image-side surface of the third lens being a convex surface
Implementation Method 4
an infrared bandpass optical filter disposed between the fourth lens and an image plane of the optical imaging lens assembly
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly. The lens assembly sequentially includes, 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 a positive refractive power, and a convex object-side surface; the second lens has a positive refractive power or a negative refractive power, and a concave object-side surface and a convex image-side surface; the third lens has a positive refractive power, a concave object-side surface, and a convex image-side surface; and the fourth lens has a positive refractive power or a negative refractive power. An effective focal length f1 of the first lens and a total effective focal length f of the optical imaging lens assembly satisfy: 1.2<f1/f<1.8.