Three-Lens Imaging Assembly for Compact Wide-Angle Brightness
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Solution Overview
Problem
Imaging lens assemblies in smart portable electronic devices face challenges in miniaturization, high brightness, and high imaging quality, particularly in obstacle avoidance systems, with existing technologies failing to balance these requirements effectively.
Innovation Solution
An optical imaging lens assembly with a three-piece lens structure, featuring specific refractive powers, surface types, and thickness distributions, including concave and convex surfaces, to achieve a high resolution, small size, and low distortion, utilizing aspheric surfaces to correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is miniaturized to reduce size, then the device dimensions are reduced, but the imaging quality and brightness may deteriorate
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (first lens object-side surface, second lens object-side and image-side surfaces, third lens object-side surface) to optimize light path control. The aspheric design enables better aberration correction in a compact form, maintaining brightness and imaging quality while reducing overall lens assembly size
Solution Approach 2:
The patent optimizes specific parameter ratios including focal length relationships (f1/f between -3.0 to -2.0, f2/f between 1.2 to 1.8), curvature radii ratios (R4/R6 between -1.8 to -1.2), and thickness ratios ((CT1+CT3)/CT2 between 0.4 to 0.8). These parameter optimizations enable miniaturization while preserving optical performance
2Manufacturing precision
If more lens elements are added to improve imaging quality, then the resolution and aberration correction are enhanced, but the device complexity and size increase
Solution Approach 1:
The patent divides the optical system into three distinct lens elements with specific refractive power distributions (first lens: negative, second lens: positive, third lens: positive or negative). Each element is optimized for specific functions - the first element for field curvature correction, the second for aberration control, and the third for focal length adjustment. This segmentation achieves high imaging quality with manageable complexity
Solution Approach 2:
The patent specifies different refractive indices and Abbe numbers for each lens element (first lens: nd between 1.50-1.70, vd between 20-50; second lens: nd between 1.45-1.65, vd between 25-60; third lens: nd between 1.50-1.70, vd between 20-50). This material composition optimization enables effective aberration correction across the three-element structure
3Length of stationary object
If the focal length is reduced to miniaturize the lens, then the device size is reduced, but the field-of-view and light admission may be compromised
Solution Approach 1:
The patent utilizes aspheric surface geometry to control light paths in multiple dimensions. The aspheric profiles enable effective field-of-view expansion (≥70 degrees) while maintaining short effective focal length (≤1.0mm) by optimizing the three-dimensional light path through the lens assembly, rather than relying solely on focal length scaling
4Length of moving object
If the lens elements are made thinner to reduce size, then the overall thickness is reduced, but the structural strength and optical performance may deteriorate
Solution Approach 1:
The patent optimizes thickness ratios between elements, specifically (CT1+CT3)/CT2 between 0.4 to 0.8, where CT1, CT2, and CT3 are center thicknesses of the first, second, and third lenses respectively. This ratio optimization ensures adequate structural integrity while maintaining miniaturization goals
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 a high resolution, small size, and high brightness while minimizing distortion, ensuring a large field-of-view and effective light admission, suitable for miniaturized smart devices.
Implementation Method 1
a first lens having a negative refractive power
Implementation Method 2
a second lens having a positive refractive power
Implementation Method 3
a third lens having a refractive power
Data Source
AI summary
The present disclosure provides an optical imaging lens assembly, comprising, sequentially along an optical axis 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 concave surface; a second lens, having a positive refractive power, an image-side surface of the second lens being a convex surface; and a third lens, having a refractive power, an image-side surface of the third lens being a concave surface. An effective focal length f1 of the first lens and an effective focal length f of the optical imaging lens assembly satisfy: −4<f1/f<−2. A maximal field-of-view FOV of the optical imaging lens assembly and the effective focal length f of the optical imaging lens assembly satisfy: 1 mm<tan(FOV/2)×f<2 mm.