Four-Element Optical Imaging Lens for Compact Wide-Field Imaging
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving miniaturization while maintaining high imaging quality, large field of view, and optimal aperture size, with complex design processes affecting production yield and assembly.
Innovation Solution
A four-lens element optical imaging lens design with specific refracting power configurations and thicknesses, including at least two lens elements with positive refracting power and thicknesses less than 250 microns, and optical relationships such as HFOV/Fno≥21.900 and EFL/Tavg≤3.300, to achieve smaller Fno, larger field of view, and good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If lens elements are miniaturized to reduce overall lens volume, then the lens can be thinner and smaller, but manufacturing precision and assembly difficulty increase significantly
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness parameters of individual lens elements and their combinations. Specifically, it sets the third lens element thickness T3 within 0.05mm to 0.15mm and the fourth lens element thickness T4 within 0.05mm to 0.10mm, while controlling the ratio T3/T4 between 0.5 and 2.0. These precise parameter specifications enable miniaturization while maintaining manufacturability and imaging quality.
2Volume of moving object
If lens elements are made thinner to achieve miniaturization, then the lens volume decreases, but imaging quality deteriorates
Solution Approach 1:
The patent applies local quality by assigning different thickness specifications to different lens elements based on their specific functions. The third lens element (T3: 0.05-0.15mm) and fourth lens element (T4: 0.05-0.10mm) have optimized thickness ranges that balance miniaturization with their specific optical roles. Additionally, the patent controls the ratio T3/T4 between 0.5 and 2.0 to ensure proper light distribution and imaging quality across the lens system.
Solution Approach 2:
The patent employs composite material principles by combining multiple lens elements with different refractive properties and thickness characteristics. The four-lens configuration integrates elements with varying Abbe numbers and refractive indices, where each element contributes differently to the overall optical performance. This composite structure enables the system to achieve high imaging quality despite the thin overall profile.
3Adaptability or versatility
If the lens design is optimized for smaller Fno and larger field of view, then aperture size and field of view improve, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the optical system into four distinct lens elements, each with specific refractive power assignments (first: negative, second: positive, third: negative, fourth: positive). This segmentation allows independent optimization of each element's thickness and curvature to achieve the target Fno and field of view parameters while distributing the optical complexity across multiple manageable components rather than one complex element.
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 design achieves a compact optical imaging lens with improved imaging quality, field of view, and aperture size, addressing the challenges of miniaturization and production yield in consumer electronic devices.
Implementation Method 1
the first lens element has negative refracting power, lens elements included by the optical imaging lens are only the four lens elements described above, wherein at least two lens elements in the optical imaging lens have positive refracting power
Data Source
AI summary
An optical imaging lens includes a first lens element to a fourth lens element, and each lens element has an object-side surface and an image-side surface. The first lens element has negative refracting power, lens elements included by the optical imaging lens are only the four lens elements described above, at least two lens elements in the optical imaging lens have positive refracting power and thicknesses of the at least two lens element along the optical axis are less than or equal to 250 microns, and the optical imaging lens satisfies the following relationships: V1+V2+V3+V4≥165.000, V1 is an Abbe number of the first lens element, V2 is an Abbe number of the second lens element, V3 is an Abbe number of the third lens element, and V4 is an Abbe number of the fourth lens element.